Battery pack circuit breaking unit and battery pack

Abstract

The invention discloses a battery pack circuit breaking unit and a battery pack, the battery pack circuit breaking unit comprises a printed circuit board, a main relay, a pre-charging relay, a pre-charging resistor, a heating relay, a slow charging fuse and a conductive connecting piece, the printed circuit board is provided with a battery positive electrode interface and a battery negative electrode interface; the main relay is connected with a battery positive electrode interface and a battery negative electrode interface, one end of the pre-charging relay is connected with one end of the pre-charging resistor in series, the other end of the pre-charging relay is connected with the battery positive electrode interface through a conductive connecting piece, and the other end of the pre-charging resistor is connected with the heating relay and the slow charging fuse through conductive connecting pieces. Therefore, the integration degree of the circuit breaking unit of the battery pack is improved, the number of parts used for connection and conduction among the parts is reduced, the loss of current in the transmission process is reduced, the overall size is reduced, and the utilization rate of the internal space of the battery pack is improved, so that the production cost is reduced, and the production efficiency is improved. And the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a battery pack disconnecting unit and a battery pack. Background Art

[0002] The battery disconnect unit (BDU) is an important component of new energy vehicles. It is used to directly cut off the circuit when the battery pack is overcharged, overheated, overcurrent or other abnormal conditions occur, so as to ensure the safety of the battery pack. In the prior art, the BDU system includes components such as the main relay, pre-charge relay, pre-charge resistor, main fuse and shunt. The components are electrically connected through copper bars and wiring harnesses. Among them, the large number of copper bars and wiring harnesses makes the BDU system occupy a large space in the battery pack, and the installation process of the copper bars and wiring harnesses is relatively cumbersome, resulting in greater difficulty in assembling the BDU system and lower production efficiency. Summary of the invention

[0003] In view of this, the present application provides a battery pack circuit breaker unit and a battery pack to solve the technical problem in the prior art that the various components of the battery pack circuit breaker unit are connected through a large number of copper bars and wiring harnesses, resulting in greater difficulty in assembling the BDU system and lower production efficiency.

[0004] The present application provides a battery pack circuit breaker unit, which includes a printed circuit board, a main relay, a heating relay, a slow charge fuse and a conductive connector. The printed circuit board is provided with a battery positive electrode interface and a battery negative electrode interface; the main relay is mounted on the printed circuit board and connected to the battery positive electrode interface and the battery negative electrode interface; the heating relay and the slow charge fuse are both mounted on the printed circuit board; the conductive connector can connect the heating relay and the main relay to form a heating circuit, and the conductive connector can connect the slow charge fuse and the main relay to form a slow charge circuit.

[0005] Among them, the battery pack circuit breaker unit also includes a pre-charging relay and a pre-charging resistor, one end of the pre-charging relay and one end of the pre-charging resistor are connected in series, the other end of the pre-charging relay is connected to the battery positive electrode interface, and the other end of the pre-charging resistor is respectively connected to the heating relay and the slow charging fuse.

[0006] In the embodiment of the present application, the main relay, pre-charge relay, pre-charge resistor, slow charge fuse and heating relay are all installed on the same printed circuit board, and a heating circuit and a slow charge circuit are formed through the battery positive electrode interface, the battery negative electrode interface and the conductive connector to improve the working reliability of the battery pack. At the same time, all components are installed on the same printed circuit board, which is conducive to improving the integration of the battery pack circuit breaker unit and reducing the number of components used for connection and conduction between the components. It can not only reduce the loss of current during transmission, but also reduce the volume of the battery pack circuit breaker unit and improve the utilization rate of the internal space of the battery pack, thereby achieving the purpose of reducing production costs and improving production efficiency.

[0007] In a possible embodiment, the printed circuit board is also provided with a heating film positive electrode interface and a heating film negative electrode interface, and the battery pack circuit breaking unit also includes a heating fuse, which is installed on the printed circuit board, one end of the heating fuse is connected to the pre-charging resistor, and the other end of the heating fuse is connected to the heating relay, and the other end of the heating relay is connected to the heating film positive electrode interface, and the battery negative electrode interface is connected to the heating film negative electrode interface.

[0008] In a possible implementation, the printed circuit board is also provided with a positive slow charging interface and a negative slow charging interface, one end of the slow charging fuse is connected to the pre-charging resistor, the other end of the slow charging fuse is connected to the positive slow charging interface, and the battery negative electrode interface is connected to the negative slow charging interface.

[0009] In a possible implementation, the conductive connector includes a copper busbar and a conductive segment, the conductive segment is arranged on the printed circuit board, the heating relay and the slow charging fuse are both connected to the pre-charging resistor through the conductive segment, the battery pack circuit breaking unit also includes a fast charging relay, the fast charging relay is installed on the printed circuit board, one end of the main relay is connected to the positive electrode of the battery module through the copper busbar, the other end of the main relay is connected to the positive electrode of the charging device through the copper busbar, one end of the fast charging relay is connected to the negative electrode of the battery module through the copper busbar, and the other end of the fast charging relay is directly connected to the negative electrode of the charging device to form a fast charging circuit.

[0010] In a possible implementation, the printed circuit board is also provided with a positive fast charging interface and a negative fast charging interface, one end of the fast charging relay is connected to the negative fast charging interface, the other end of the fast charging relay is connected to the battery negative electrode interface, and the battery positive electrode interface is connected to the positive fast charging interface.

[0011] In a possible implementation, the printed circuit board is also provided with a positive output interface and a negative output interface, one end of the main relay is connected to the battery positive interface, the other end of the main relay is connected to the positive output interface, and the battery negative interface is connected to the negative output interface.

[0012] In a possible embodiment, the printed circuit board is also provided with a negative electrode output interface, a negative electrode slow charging interface and a heating film negative electrode interface, and the battery pack circuit breaking unit also includes a fast charging relay; the battery pack circuit breaking unit also includes a shunt and a main fuse, one end of the shunt and one end of the main fuse are connected in series, the other end of the shunt is connected to the battery negative electrode interface, and the other end of the main fuse is respectively connected to the fast charging relay, the negative electrode output interface, the negative electrode slow charging interface and the heating film negative electrode interface.

[0013] In a possible implementation, the printed circuit board is also provided with a positive fast charging interface and a positive output interface, and the battery pack circuit breaking unit also includes a first copper bar, a second copper bar, a third copper bar, a fourth copper bar and a fifth copper bar; one end of the main relay is connected to the battery positive electrode interface through the first copper bar, and the other end of the main relay is respectively connected to the positive fast charging interface and the positive output interface through the second copper bar; one end of the fast charging relay is respectively connected to the main fuse, the negative output interface and the negative slow charging interface through the third copper bar, the other end of the main fuse is connected to the shunt through the fourth copper bar, and the other end of the shunt is connected to the battery negative electrode interface through the fifth copper bar.

[0014] In a possible embodiment, the printed circuit board is also provided with a positive electrode slow charging interface and a heating film positive electrode interface, and the battery pack circuit breaking unit also includes a heating fuse; the printed circuit board is also provided with a first conductive segment, a second conductive segment, a third conductive segment, a fourth conductive segment, a fifth conductive segment and a sixth conductive segment; one end of the pre-charging relay is connected to the first copper bus through the first conductive segment, the other end of the pre-charging relay is connected to the pre-charging resistor through the second conductive segment, the other end of the pre-charging resistor is respectively connected to the slow charging fuse, the heating fuse and the second copper bus through the third conductive segment, the other end of the slow charging fuse is connected to the positive electrode slow charging interface through the fourth conductive segment, the other end of the heating fuse is connected to the heating relay through the fifth conductive segment, and the other end of the heating relay is connected to the heating film positive electrode interface through the sixth conductive segment.

[0015] In a possible implementation, the battery pack circuit breaking unit further includes a connector, and the printed circuit board is further provided with a seventh conductive segment; along the height direction of the battery pack circuit breaking unit, the printed circuit board has a first surface and a second surface that are relatively arranged, the main relay and the fast charging relay are both installed on the first surface, the connector is installed on the second surface, and is connected to the main relay and the fast charging relay through the seventh conductive segment.

[0016] In a possible embodiment, the battery pack circuit disconnecting unit also includes a shell, and the shell and the printed circuit board are distributed along the height direction of the battery pack circuit disconnecting unit, and the shell is provided with at least a first through hole and a second through hole, the main relay is located in the first through hole and abuts against the side wall of the first through hole, and the fast charging relay is located in the second through hole and abuts against the side wall of the second through hole; along the height direction of the battery pack circuit disconnecting unit, the side wall of the first through hole and the side wall of the second through hole both extend relative to the shell in a direction away from the printed circuit board.

[0017] In a possible implementation, the battery pack circuit-breaking unit further includes a plurality of insulating parts and a plurality of copper bars. Along the height direction of the battery pack circuit-breaking unit, the insulating parts are installed on a side of the shell away from the printed circuit board, and the copper bars are installed on the shell through the insulating parts.

[0018] In a possible embodiment, the battery pack circuit breaking unit also includes a sixth copper bar and a seventh copper bar, one end of the sixth copper bar is connected to the battery positive electrode interface, the other end of the sixth copper bar is connected to the first conductive segment, one end of the seventh copper bar is connected to the positive fast charging interface and the positive output interface, the other end of the seventh copper bar is connected to the third conductive segment, and the shell is also provided with a first baffle and a second baffle, the sixth copper bar is fitted with the first baffle, and the seventh copper bar is fitted with the second baffle.

[0019] The present application also provides a battery pack, which includes a battery module and a battery pack circuit breaker unit, and the battery pack circuit breaker unit is the battery pack circuit breaker unit described in any one of the above items; wherein one end of the battery module is connected to the battery positive electrode interface, and the other end of the battery module is connected to the battery negative electrode interface.

[0020] In the embodiment of the present application, when the battery pack needs fast charging, the battery pack circuit breaker unit can switch to the fast charging mode, so that the positive fast charging interface and the negative fast charging interface of the battery pack circuit breaker unit are respectively electrically connected to the positive and negative poles of the charging device, so that the battery module, the battery pack circuit breaker unit and the charging device are interconnected to form a fast charging circuit, which is beneficial to improving the charging efficiency of the battery pack and shortening the charging time; when the battery pack needs to be discharged, the battery pack circuit breaker unit can switch to the discharge mode, so that the positive output interface and the negative output interface of the battery pack circuit breaker unit are respectively electrically connected to the positive and negative poles of the power-consuming device, so that the battery module, the battery pack circuit breaker unit and the power-consuming device are interconnected to form a discharge circuit, which is beneficial to improving the energy utilization efficiency; when the battery pack needs to be slow charged, the battery pack circuit breaker unit can switch to the slow charging mode, so that the positive output interface and the negative output interface of the battery pack circuit breaker unit are respectively electrically connected to the positive and negative poles of the power-consuming device, so that the battery module, the battery pack circuit breaker unit and the power-consuming device are interconnected to form a discharge circuit, which is beneficial to improving the energy utilization efficiency; The charging mode is used to electrically connect the positive slow charging interface and the negative slow charging interface of the battery pack circuit breaker unit to the positive and negative electrodes of the charging device respectively, so that the battery module, the battery pack circuit breaker unit and the charging device are interconnected to form a slow charging circuit, which is beneficial to improving the stability and safety of the battery pack during the charging process, so that the battery pack can be in a good use state, thereby facilitating extending the service life of the battery pack; when the battery pack needs to be heated, the battery pack circuit breaker unit can be switched to the heating mode, so that the heating film positive electrode interface and the heating film negative electrode interface of the battery pack circuit breaker unit are electrically connected to the positive and negative electrodes of the heating film respectively, so that the battery module, the battery pack circuit breaker unit and the heating film are interconnected to form a heating circuit, which is beneficial to improving the working performance of the battery pack in a low temperature environment, thereby extending the service life of the battery pack.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a schematic diagram of the specific structure of the battery pack circuit breaker unit provided in this application;

[0024] Figure 2 It is an electrical schematic diagram of the battery pack disconnect unit provided in this application;

[0025] Figure 3 yes Figure 1 Exploded diagram of

[0026] Figure 4It is a structural schematic diagram of a printed circuit board and an electrical component provided in the present application in a specific embodiment;

[0027] Figure 5 yes Figure 4 A top view of

[0028] Figure 6 is a top view of the printed circuit board provided in this application;

[0029] Figure 7 is a bottom view of the printed circuit board provided by the present application;

[0030] Figure 8 It is a structural schematic diagram of the shell provided in this application in a specific embodiment.

[0031] Description of reference numerals:

[0032] 1-Printed circuit board;

[0033] 11- First side;

[0034] 111- a first conductive segment;

[0035] 112- a second conductive segment;

[0036] 113- third conductive segment;

[0037] 114- fourth conductive segment;

[0038] 115- fifth conductive segment;

[0039] 116-sixth conductive segment;

[0040] 12- Second side;

[0041] 121-seventh conductive segment;

[0042] 131-battery positive terminal interface;

[0043] 132-battery negative terminal interface;

[0044] 133-Positive fast charging interface;

[0045] 134-negative fast charging interface;

[0046] 135- positive output interface;

[0047] 136-negative output interface;

[0048] 137-Positive slow charging interface;

[0049] 138- negative electrode slow charging interface;

[0050] 139-heating film positive electrode interface;

[0051] 1310-heating film negative electrode interface;

[0052] 2-Electrical components;

[0053] 21- Main relay;

[0054] 22-fast charging relay;

[0055] 23-Pre-charge relay;

[0056] 24- pre-charge resistance;

[0057] 25-slow charge fuse;

[0058] 26-heating fuse;

[0059] 27-Heating relay;

[0060] 28-shunt;

[0061] 29- Main fuse;

[0062] 210-connector;

[0063] 3-Copper busbar;

[0064] 31-first copper bar;

[0065] 32- the second copper bar;

[0066] 33-the third copper bar;

[0067] 34- the fourth copper bar;

[0068] 35-Fifth copper bar;

[0069] 36-sixth copper bar;

[0070] 37-the seventh copper bar;

[0071] 4- housing;

[0072] 41-first through hole;

[0073] 42- second through hole;

[0074] 43- first baffle;

[0075] 44- second baffle;

[0076] 5-Insulation parts;

[0077] 51- a first insulating member;

[0078] 52- second insulating member;

[0079] 53- third insulating member;

[0080] 54- fourth insulating member;

[0081] 55- fifth insulating member;

[0082] 56-sixth insulating member.

[0083] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0084] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0085] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0086] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0087] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0088] The embodiment of the present application provides a battery pack disconnecting unit for a battery pack, such as Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the battery pack circuit breaker unit includes a printed circuit board 1 and an electrical component 2. The battery pack circuit breaker unit is also provided with an interface for connecting a battery module, an electrical device and a charging device, and the interface includes at least a battery positive electrode interface 131 and a battery negative electrode interface 132. The electrical component 2 is mounted on the printed circuit board 1, and is used to realize the transmission, control and conversion of current. The electrical component 2 includes at least a main relay 21, a heating relay 27 and a slow charge fuse 25.

[0089] Among them, the battery positive electrode interface 131 and the battery negative electrode interface 132 are electrically connected to the positive electrode and the negative electrode of the battery module respectively, and the battery pack circuit breaker unit also includes a conductive connector, which includes a plurality of copper bars 3 and a plurality of conductive segments. The main relay 21 is connected to the copper bar 3, and the conductive segment is arranged in the conductive area of ​​the printed circuit board 1, and at least part of the copper bar 3 is electrically connected to the conductive segment. In a specific embodiment, the conductive segment is a copper foil. When the heating relay 27 is electrically connected to the main relay 21 through the copper bar 3 and the conductive segment, a heating circuit can be formed, so that the battery pack circuit breaker unit can be in a heating mode, which is conducive to reducing the possibility of the battery pack's charging and discharging performance attenuation in a low temperature environment, reducing the damage to the battery pack in a low temperature environment, and improving the service life of the battery pack. When the slow charging fuse 25 is connected to the main relay 21 through the copper bar 3 and the conductive segment, a slow charging circuit can be formed, so that the battery pack circuit breaker unit can be in a slow charging mode, which is conducive to improving the stability and safety of the battery pack during the charging process, so that the battery pack can be in a good use state, thereby facilitating the extension of the service life of the battery pack.

[0090] In addition, the electrical component 2 also includes a pre-charge relay 23 and a pre-charge resistor 24. The pre-charge relay 23, the pre-charge resistor 24, the slow charge fuse 25 and the heating relay 27 are all installed in the conductive area of ​​the printed circuit board 1. The pre-charge relay 23 and the pre-charge resistor 24 are connected in series through the conductive segment, and the other end of the pre-charge relay 23 is electrically connected to the battery positive electrode interface 131 through the copper bus 3 and the conductive segment, and the other end of the pre-charge resistor 24 is electrically connected to the heating relay 27 and the slow charge fuse 25 through the conductive segment. The pre-charge relay 23 and the pre-charge resistor 24 are used to balance the voltage between the battery module and the charging device, reduce the impact current caused by the voltage mutation, thereby achieving the purpose of protecting the battery module and the circuit, so as to improve the safety of the battery pack during operation.

[0091] Therefore, the main relay 21, pre-charge relay 23, pre-charge resistor 24, slow charge fuse 25 and heating relay 27 in this embodiment are all installed on the same printed circuit board 1, and a heating circuit and a slow charge circuit are formed through the battery positive electrode interface 131, the battery negative electrode interface 132 and the conductive connector to improve the working reliability of the battery pack. At the same time, all components are installed on the same printed circuit board 1, which is conducive to improving the integration of the battery pack circuit breaker unit and reducing the number of components used for connection and conduction between the components. It can not only reduce the loss of current during transmission, but also reduce the volume of the battery pack circuit breaker unit and improve the utilization rate of the internal space of the battery pack, thereby achieving the purpose of reducing production costs and improving production efficiency.

[0092] In a specific embodiment, Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the interface of the battery pack circuit breaker unit also includes a heating film positive electrode interface 139 and a heating film negative electrode interface 1310, and the electrical component 2 also includes a heating fuse 26, which is installed in the conductive area of ​​the printed circuit board 1, one end of the heating fuse 26 is connected to the pre-charging resistor 24, and the other end of the heating fuse 26 is connected to the heating relay 27, and the other end of the heating relay 27 is connected to the heating film positive electrode interface 139, and the battery negative electrode interface 132 is connected to the heating film negative electrode interface 1310.

[0093] In the embodiment of the present application, the electrical component 2 also includes a heating film (not shown in the figure) for generating heat and heating the battery module so that the battery pack can work normally in a low temperature environment. The heating film positive electrode interface 139 and the heating film negative electrode interface 1310 are electrically connected to the positive electrode and negative electrode of the heating film respectively, and because one end of the pre-charge relay 23 is connected to the pre-charge resistor 24, and the other end of the pre-charge relay 23 is connected to the battery positive electrode interface 131, when one end of the heating fuse 26 is connected to the pre-charge resistor 24, the other end of the heating fuse 26 is connected to the heating relay 27, and the other end of the heating relay 27 is connected to the heating film positive electrode interface 139, and the battery negative electrode interface 132 is connected to the heating film negative electrode interface 1310, the battery module, the battery pack circuit breaker unit and the heating film are interconnected to form a heating circuit, so that the battery pack circuit breaker unit can be in a heating mode, which is conducive to reducing the possibility of the battery pack's charging and discharging performance attenuation in a low temperature environment, reducing the damage to the battery pack in a low temperature environment, and improving the service life of the battery pack.

[0094] Among them, the heating fuse 26 and the heating relay 27 are both installed in the conductive area of ​​the printed circuit board 1, and the heating fuse 26 and the heating relay 27 are connected in series through the conductive area of ​​the printed circuit board 1, and the other end of the heating fuse 26 is electrically connected to the pre-charging resistor 24 through the conductive area of ​​the printed circuit board 1, and the other end of the heating relay 27 is electrically connected to the heating film positive electrode interface 139 through the conductive area of ​​the printed circuit board 1. The heating fuse 26 and the heating relay 27 are used to melt the fuse with the heat generated by itself when the current in the heating circuit is too large, so as to achieve the purpose of protecting the battery module and the circuit, so as to improve the safety of the battery pack during the heating process.

[0095] Specifically, the battery pack disconnect unit can be in the heating mode alone, or it can be used in conjunction with other working modes, such as any one of the fast charging mode, the discharging mode and the slow charging mode.

[0096] When the battery pack disconnecting unit is connected only to the battery module, and the main relay 21, the pre-charging relay 23 and the heating relay 27 are all in a closed state, the battery pack disconnecting unit is in a separate heating mode.

[0097] When the battery pack disconnect unit is connected to the battery module and the charging device, and the main relay 21, the pre-charge relay 23 and the heating relay 27 are all in a closed state, the battery pack disconnect unit is in the fast charging mode and the heating mode at the same time.

[0098] When the battery pack disconnect unit is connected to the battery module and the electrical device, and the main relay 21 and the heating relay 27 are both in the closed state, and the pre-charge relay 23 is in the open state, the battery pack disconnect unit is in the discharge mode and the heating mode at the same time.

[0099] When the battery pack disconnect unit is connected to the battery module and the charging device, and the main relay 21 and the heating relay 27 are both in a closed state, and the pre-charge relay 23 is in an open state, the battery pack disconnect unit is in a slow charging mode and a heating mode at the same time.

[0100] Therefore, the printed circuit board 1 in this embodiment also integrates the heating fuse 26, the heating relay 27 and the heating film, and forms a heating circuit with the main relay 21, the pre-charging relay 23 and the pre-charging resistor 24 through the battery positive electrode interface 131, the battery negative electrode interface 132, the heating film positive electrode interface 139 and the heating film negative electrode interface 1310, which is beneficial to ensure the stability and reliability of the battery pack working in a low temperature environment. At the same time, since the voltage and current flowing in the heating circuit are relatively small, integrating it on the printed circuit board 1 can also simplify the production process of the battery pack circuit breaker unit and shorten the production cycle.

[0101] In a specific embodiment, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the interface of the battery pack circuit breaker unit also includes a positive slow charging interface 137 and a negative slow charging interface 138, one end of the slow charging fuse 25 is connected to the pre-charging resistor 24, the other end of the slow charging fuse 25 is connected to the positive slow charging interface 137, and the battery negative electrode interface 132 is connected to the negative slow charging interface 138.

[0102] In the embodiment of the present application, the positive slow charging interface 137 and the negative slow charging interface 138 are electrically connected to the positive and negative electrodes of the charging device respectively, and since one end of the pre-charging relay 23 is connected to the pre-charging resistor 24, the other end of the pre-charging relay 23 is connected to the battery positive electrode interface 131, when one end of the slow charging fuse 25 is connected to the pre-charging resistor 24, the other end of the slow charging fuse 25 is connected to the positive slow charging interface 137, and the battery negative electrode interface 132 is connected to the negative slow charging interface 138, the battery module, the battery pack circuit breaker unit and the charging device are interconnected to form a slow charging circuit, so that the battery pack circuit breaker unit can be in a slow charging mode, which is beneficial to improve the stability and safety of the battery pack during the charging process, so that the battery pack can be in a good use state, thereby facilitating the extension of the service life of the battery pack.

[0103] The slow charge fuse 25 is installed in the conductive area of ​​the printed circuit board 1, and is electrically connected to the pre-charge resistor 24 and the positive slow charge interface 137 through the conductive area of ​​the printed circuit board 1. The slow charge fuse 25 is used to melt the fuse with the heat generated by itself when the current output by the charging device is too large, thereby achieving the purpose of protecting the battery module and the circuit, so as to improve the safety of the battery pack during the charging process.

[0104] Specifically, when the battery pack circuit breaker unit is in the slow charging mode, the pre-charging relay 23 can be in a closed state to improve the safety of the battery pack during the charging process. The pre-charging relay 23 can also be in an open state to improve the charging efficiency of the battery pack and shorten the charging time.

[0105] Therefore, the printed circuit board 1 in this embodiment also integrates a slow charging fuse 25, which forms a slow charging circuit with the main relay 21, the pre-charging relay 23 and the pre-charging resistor 24 through the battery positive electrode interface 131, the battery negative electrode interface 132, the positive electrode slow charging interface 137 and the negative electrode slow charging interface 138, which is beneficial to improve the stability and safety of the battery pack during the charging process and extend the service life of the battery pack. At the same time, since the voltage and current flowing in the slow charging circuit are relatively small, integrating it on the printed circuit board 1 can also simplify the production process of the battery pack circuit breaker unit and shorten the production cycle.

[0106] In a specific embodiment, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the battery pack circuit breaker unit also includes a fast charging relay 22, which is installed on the printed circuit board 1, one end of the main relay 21 is connected to the positive electrode of the battery module through the copper bus 3, the other end of the main relay 21 is connected to the positive electrode of the charging device through the copper bus 3, one end of the fast charging relay 22 is connected to the negative electrode of the battery module through the copper bus 3, and the other end of the fast charging relay 22 is directly connected to the negative electrode of the charging device to form a fast charging circuit.

[0107] In the embodiment of the present application, since the battery positive electrode interface 131 and the battery negative electrode interface 132 are respectively electrically connected to the positive electrode and negative electrode of the battery module, when one end of the main relay 21 is electrically connected to the battery positive electrode interface 131, the other end of the main relay 21 is electrically connected to the positive electrode of the charging device, one end of the fast charging relay 22 is electrically connected to the battery negative electrode interface 132, and the other end of the fast charging relay 22 is electrically connected to the negative electrode of the charging device, the battery module, the battery pack circuit breaker unit and the charging device are interconnected to form a fast charging circuit, so that the battery pack circuit breaker unit can be in the fast charging mode, which is beneficial to improve the charging efficiency of the battery pack and shorten the charging time.

[0108] Specifically, the main relay 21 and the fast charge relay 22 can be fixedly connected to the printed circuit board 1 by welding, bonding or fixing with fasteners, so as to improve the stability and reliability of the connection between the two and the printed circuit board 1. More specifically, the installation positions of the main relay 21 and the fast charge relay 22 on the printed circuit board 1 are staggered from the conductive area on the printed circuit board 1, so as to avoid the high voltage current flowing through the main relay 21 and the fast charge relay 22 from damaging the conductive area of ​​the printed circuit board 1 when the battery pack disconnect unit is in the fast charge mode, thereby reducing the possibility of damage to the printed circuit board 1 and improving the safety of the printed circuit board 1 during operation.

[0109] In a specific embodiment, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the printed circuit board 1 is also provided with a positive fast charging interface 133 and a negative fast charging interface 134, one end of the fast charging relay 22 is connected to the negative fast charging interface 134, the other end of the fast charging relay 22 is connected to the battery negative electrode interface 132, and the battery positive electrode interface 131 is connected to the positive fast charging interface 133.

[0110] In the embodiment of the present application, since the positive fast charging interface 133 and the negative fast charging interface 134 are electrically connected to the positive and negative electrodes of the charging device respectively, when one end of the main relay 21 is electrically connected to the battery positive electrode interface 131, the other end of the main relay 21 is electrically connected to the positive fast charging interface 133, one end of the fast charging relay 22 is electrically connected to the battery negative electrode interface 132, and the other end of the fast charging relay 22 is electrically connected to the negative electrode fast charging interface 134, the battery module, the battery pack circuit breaker unit and the charging device are interconnected to form a fast charging circuit, so that the battery pack circuit breaker unit can be in fast charging mode, which is beneficial to improve the charging efficiency of the battery pack and shorten the charging time.

[0111] Specifically, in the process of switching the battery pack circuit breaker unit to the fast charging mode, the main relay 21 and the pre-charging relay 23 can be controlled to be in the open state first, so that the current output by the charging device cannot flow to the battery module through the battery pack circuit breaker unit, and then the pre-charging relay 23 can be controlled to be in the closed state, so that the current output by the charging device first flows through the pre-charging relay 23 and the pre-charging resistor 24 and then flows to the battery module. After the current output by the charging device is stably transmitted in the battery pack circuit breaker unit, the main relay 21 is controlled to be in the closed state to put the battery pack circuit breaker unit in the fast charging mode.

[0112] Therefore, the main relay 21, fast charging relay 22, pre-charging relay 23 and pre-charging resistor 24 in this embodiment are all installed on the same printed circuit board 1, and a fast charging circuit is formed through the battery positive electrode interface 131, the battery negative electrode interface 132, the positive electrode fast charging interface 133 and the negative electrode fast charging interface 134 to improve the charging efficiency of the battery pack.

[0113] In a specific embodiment, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the interface of the battery pack circuit breaker unit also includes a positive output interface 135 and a negative output interface 136, one end of the main relay 21 is connected to the battery positive interface 131, the other end of the main relay 21 is connected to the positive output interface 135, and the battery negative interface 132 is connected to the negative output interface 136.

[0114] In an embodiment of the present application, the positive output interface 135 and the negative output interface 136 are electrically connected to the positive and negative poles of the electrical device, respectively, and when one end of the main relay 21 is connected to the battery positive interface 131, the other end of the main relay 21 is connected to the positive output interface 135, and the battery negative interface 132 is connected to the negative output interface 136, the battery module, the battery pack circuit breaker unit and the electrical device are interconnected to form a discharge circuit, so that the battery pack circuit breaker unit can be in a discharge mode.

[0115] Specifically, when the battery pack circuit breaker unit is in the discharge mode, the pre-charge relay 23 can be in the open state so that the current output by the battery module does not need to flow through the pre-charge relay 23 and the pre-charge resistor 24, thereby facilitating further reducing the current consumption during the transmission process and helping to improve energy utilization efficiency.

[0116] Therefore, the main relay 21, fast charging relay 22, pre-charging relay 23 and pre-charging resistor 24 in this embodiment can form a discharge circuit through the battery positive electrode interface 131, the battery negative electrode interface 132, the positive electrode output interface 135 and the negative electrode output interface 136 to shorten the transmission distance between the battery pack and the electrical device, which is beneficial to reduce losses and improve transmission efficiency, thereby improving the stability and reliability of the electrical device during operation.

[0117] In a specific embodiment, Figure 1 and Figure 3 As shown, the electrical component 2 also includes a shunt 28 and a main fuse 29. One end of the shunt 28 and one end of the main fuse 29 are connected in series, the other end of the shunt 28 is connected to the battery negative electrode interface 132, and the other end of the main fuse 29 is respectively connected to the fast charging relay 22, the negative electrode output interface 136, the negative electrode slow charging interface 138 and the heating film negative electrode interface 1310.

[0118] In the embodiment of the present application, the shunt 28 and the main fuse 29 are both used to protect the circuit in the battery pack circuit breaker unit to further reduce the possibility of the battery pack circuit breaker unit being damaged due to excessive current during operation.

[0119] Specifically, when one end of the shunt 28 and one end of the main fuse 29 are connected in series, the other end of the shunt 28 is connected to the battery negative electrode interface 132, and the other end of the main fuse 29 is respectively connected to the fast charging relay 22, the negative electrode output interface 136, the negative electrode slow charging interface 138 and the heating film negative electrode interface 1310, the current in each mode needs to flow through the shunt 28 and the main fuse 29 to further improve the safety of the battery pack circuit breaker unit during operation.

[0120] When the battery pack circuit breaker unit is in the fast charging mode, the current output by the charging device first flows into the main relay 21, the pre-charging relay 23 and the pre-charging resistor 24 through the positive fast charging interface 133, then flows into the battery module through the battery positive interface 131, and flows out of the battery module through the battery negative interface 132, then flows into the shunt 28 and the main fuse 29, and finally flows into the fast charging relay 22 and flows back to the charging device through the negative fast charging interface 134 to realize the current flow in the fast charging mode.

[0121] When the battery pack circuit breaker unit is in the discharge mode, the current output by the battery module first flows into the main relay 21 through the battery positive electrode interface 131, then flows into the electrical device through the positive electrode output interface 135, and flows out of the electrical device through the negative electrode output interface 136, then flows into the main fuse 29 and the shunt 28, and finally flows back to the battery module through the battery negative electrode interface 132 to realize the current flow in the discharge mode.

[0122] When the battery pack circuit breaker unit is in slow charging mode, the current output by the charging device first flows into the main relay 21 through the positive slow charging interface 137, then flows into the battery module through the battery positive interface 131, and flows out of the battery module through the battery negative interface 132, then flows into the shunt 28 and the main fuse 29, and finally flows back to the charging device through the negative slow charging interface 138 to realize the current flow in slow charging mode.

[0123] When the battery pack circuit breaker unit is in the heating mode, the current output by the battery module first flows into the main relay 21 through the battery positive electrode interface 131 (when the pre-charging relay 23 is in a closed state, the current flows into the pre-charging relay 23 and the pre-charging resistor 24 at the same time), and part of the current (when the battery pack circuit breaker unit is in the single heating mode, it is the whole current) flows into the heating fuse 26 and the heating relay 27, and then flows into the heating film through the heating film positive electrode interface 139, and flows out of the heating film through the heating film negative electrode interface 1310, and then flows into the main fuse 29 and the shunt 28, and finally flows back to the battery module through the battery negative electrode interface 132 to realize the current flow in the heating mode.

[0124] Therefore, the printed circuit board 1 in this embodiment also integrates the shunt 28 and the main fuse 29, which can improve the stability and reliability of the circuit of the battery pack disconnecting unit in various working modes.

[0125] In a specific embodiment, Figure 1 and Figure 3 As shown, the copper bar 3 at least includes a first copper bar 31 , a second copper bar 32 , a third copper bar 33 , a fourth copper bar 34 and a fifth copper bar 35 .

[0126] One end of the main relay 21 is connected to the battery positive electrode interface 131 through the first copper busbar 31, and the other end of the main relay 21 is connected to the positive fast charging interface 133 and the positive output interface 135 respectively through the second copper busbar 32; one end of the fast charging relay 22 is connected to the main fuse 29, the negative output interface 136 and the negative slow charging interface 138 respectively through the third copper busbar 33, the other end of the main fuse 29 is connected to the shunt 28 through the fourth copper busbar 34, and the other end of the shunt 28 is connected to the battery negative electrode interface 132 through the fifth copper busbar 35.

[0127] In the embodiment of the present application, the copper busbar 3 has good conductivity and can carry higher voltage and current, which is beneficial to improving the safety of the battery pack circuit breaker unit in the fast charging circuit and the discharge circuit.

[0128] When one end of the main relay 21 is electrically connected to the battery positive electrode interface 131 through the first copper busbar 31, the other end of the main relay 21 is electrically connected to the positive electrode fast charging interface 133 through the second copper busbar 32, one end of the fast charging relay 22 is directly electrically connected to the negative electrode fast charging interface 134, the other end of the fast charging relay 22 is electrically connected to the main fuse 29 through the third copper busbar 33, the other end of the main fuse 29 is electrically connected to the shunt 28 through the fourth copper busbar 34, and the other end of the shunt 28 is electrically connected to the battery negative electrode interface 132 through the fifth copper busbar 35, a high-voltage circuit in the fast charging loop can be formed, so as to improve the charging current transmission efficiency during the fast charging process while improving the safety of the battery pack circuit breaker unit during operation.

[0129] When one end of the main relay 21 is electrically connected to the battery positive electrode interface 131 through the first copper busbar 31, the other end of the main relay 21 is electrically connected to the positive output interface 135 through the second copper busbar 32, the negative output interface 136 is electrically connected to the main fuse 29 through the third copper busbar 33, the other end of the main fuse 29 is electrically connected to the shunt 28 through the fourth copper busbar 34, and the other end of the shunt 28 is electrically connected to the battery negative electrode interface 132 through the fifth copper busbar 35, a high-voltage circuit in the discharge loop can be formed, so as to improve the current transmission efficiency during the discharge process while improving the safety of the battery pack circuit breaker unit during operation.

[0130] At the same time, at least part of the slow charging circuit is also electrically connected through the copper bar 3. Specifically, the negative slow charging interface 138 is electrically connected to the main fuse 29 through the third copper bar 33, the other end of the main fuse 29 is electrically connected to the shunt 28 through the fourth copper bar 34, and the other end of the shunt 28 is electrically connected to the battery negative electrode interface 132 through the fifth copper bar 35, so that the current in the slow charging circuit flows through the main fuse 29 and the shunt 28, thereby improving the safety of the battery pack circuit breaker unit during the slow charging process.

[0131] Therefore, the copper bus 3 in this embodiment can not only connect the main relay 21, the fast charging relay 22, the shunt 28, the main fuse 29, the battery positive electrode interface 131, the battery negative electrode interface 132, the positive fast charging interface 133, the positive output interface 135 and the negative output interface 136 to improve the safety of the battery pack circuit breaker unit in the fast charging circuit and the discharge circuit, but can also connect the negative slow charging interface 138 to ensure the safety of the battery pack circuit breaker unit in the slow charging circuit. At the same time, all components are arranged on the printed circuit board 1, which is conducive to improving the integration of the battery pack circuit breaker unit, improving the current transmission efficiency, and reducing the current loss during the transmission process.

[0132] In a specific embodiment, Figure 6 As shown, the conductive segments include a first conductive segment 111 , a second conductive segment 112 , a third conductive segment 113 , a fourth conductive segment 114 , a fifth conductive segment 115 and a sixth conductive segment 116 .

[0133] One end of the pre-charging relay 23 is connected to the first copper bus 31 through the first conductive segment 111, the other end of the pre-charging relay 23 is connected to the pre-charging resistor 24 through the second conductive segment 112, the other end of the pre-charging resistor 24 is respectively connected to the slow charging fuse 25, the heating fuse 26 and the second copper bus 32 through the third conductive segment 113, the other end of the slow charging fuse 25 is connected to the positive pole slow charging interface 137 through the fourth conductive segment 114, the other end of the heating fuse 26 is connected to the heating relay 27 through the fifth conductive segment 115, and the other end of the heating relay 27 is connected to the heating film positive pole interface 139 through the sixth conductive segment 116.

[0134] In the embodiment of the present application, each conductive segment of the printed circuit board 1 can carry a relatively low voltage and current, which is beneficial to improving the reliability of information transmission of the battery pack circuit breaker unit in each circuit.

[0135] Specifically, the battery module can be electrically connected to the battery management system through the battery pack circuit breaker unit. The battery management system is used to monitor the working status of the battery module, reduce the possibility of overcharging, over-discharging and overheating of the battery module, and increase the service life of the battery module. When the battery module, battery pack circuit breaker unit and battery management system are applied to electric vehicles, they can improve the working performance and cruising range of the entire vehicle, as well as the safety of the vehicle during the forming process.

[0136] When one end of the pre-filling relay 23 is electrically connected to the first copper bus 31 through the first conductive segment 111, the other end of the pre-filling relay 23 is electrically connected to the pre-filling resistor 24 through the second conductive segment 112, and the other end of the pre-filling resistor 24 is electrically connected to the second copper bus 32 through the third conductive segment 113, the pre-filling relay 23 and the pre-filling resistor 24 are connected in parallel with the main relay 21, so that the pre-filling relay 23 can be closed or opened under the control of the battery management system. When the pre-filling relay 23 is closed, part of the current can flow through the pre-filling resistor 24 to improve the safety of the battery pack disconnect unit during operation, or when the pre-filling relay 23 is opened, all the current can flow through the main relay 21 to improve the current transmission efficiency.

[0137] When one end of the pre-charging relay 23 is electrically connected to the first copper bus 31 through the first conductive segment 111, the other end of the pre-charging relay 23 is electrically connected to the pre-charging resistor 24 through the second conductive segment 112, the other end of the pre-charging resistor 24 is electrically connected to the slow charging fuse 25 through the third conductive segment 113, and the other end of the slow charging fuse 25 is electrically connected to the positive pole slow charging interface 137 through the fourth conductive segment 114, the negative pole slow charging interface 138 is electrically connected to the main fuse 29 through the third copper bus 33, the other end of the main fuse 29 is electrically connected to the shunt 28 through the fourth copper bus 34, and the other end of the shunt 28 is electrically connected to the battery negative pole interface 132 through the fifth copper bus 35, so that the battery management system can judge the working state of the battery pack circuit breaker unit during the slow charging process by whether the current can flow through the slow charging fuse 25.

[0138] When one end of the pre-charging relay 23 is electrically connected to the first copper bus 31 through the first conductive segment 111, the other end of the pre-charging relay 23 is electrically connected to the pre-charging resistor 24 through the second conductive segment 112, the other end of the pre-charging resistor 24 is electrically connected to the heating fuse 26 through the third conductive segment 113, the other end of the heating fuse 26 is electrically connected to the heating relay 27 through the fifth conductive segment 115, and the other end of the heating relay 27 is electrically connected to the heating film positive electrode interface 139 through the sixth conductive segment 116, the heating film negative electrode interface 1310 is directly electrically connected to one end of the main fuse 29, the other end of the main fuse 29 is electrically connected to the shunt 28 through the fourth copper bus 34, and the other end of the shunt 28 is electrically connected to the battery negative electrode interface 132 through the fifth copper bus 35, so that the battery management system can judge the working status of the battery pack circuit breaker unit during the heating process by whether the current can flow through the heating fuse 26. At the same time, it can also control the heating relay 27 to close when the battery module needs to be heated or open when the battery module does not need to be heated.

[0139] Therefore, the conductive segments in this embodiment can be interconnected with the first copper bus 31, the pre-charging relay 23, the pre-charging resistor 24, the second copper bus 32, the slow charging fuse 25, the heating fuse 26, the heating relay 27, the positive electrode slow charging interface 137 and the heating film positive electrode interface 139 to improve the reliability of information transmission of the battery pack circuit breaker unit in each circuit. At the same time, each component is arranged on the printed circuit board 1, which is conducive to improving the integration level of the battery pack circuit breaker unit, improving the transmission efficiency of the electrical signal, and improving the response speed of the battery management system.

[0140] In a specific embodiment, Figure 7 As shown, the electrical component 2 further includes a connector 210 , and the conductive area of ​​the printed circuit board 1 further includes a seventh conductive segment 121 .

[0141] Along the height direction of the battery pack circuit breaking unit, the printed circuit board 1 has a first surface 11 and a second surface 12 that are relatively arranged. The main relay 21 and the fast charging relay 22 are both installed on the first surface 11, and the connector 210 is installed on the second surface 12 and connected to the main relay 21 and the fast charging relay 22 through the seventh conductive segment 210.

[0142] It should be noted that the above-mentioned main relay 21, fast charging relay 22, pre-charging relay 23, pre-charging resistor 24, slow charging fuse 25, heating fuse 26 and heating relay 27 are all installed on the first surface 11 of the printed circuit board 1; the above-mentioned first conductive segment 111, second conductive segment 112, third conductive segment 113, fourth conductive segment 114, fifth conductive segment 115 and sixth conductive segment 116 are all arranged in the conductive area of ​​the first surface 11 of the printed circuit board 1.

[0143] In the embodiment of the present application, the connector 210 is used to be electrically connected to the battery management system so that current and signals can be transmitted between the battery management system and the battery pack disconnecting unit through the connector 210. Specifically, the connector 210 is installed in the conductive area of ​​the second surface 12 of the printed circuit board 1 so that one end of the connector 210 is electrically connected to the seventh conductive segment 121, and the other end of the connector 210 is electrically connected to the battery management system. More specifically, the connector 210 can be electrically connected to the battery management system through a wiring harness to improve the reliability and safety of the connection between the connector 210 and the battery management system, and facilitate the transmission of current and signals.

[0144] The printed circuit board 1 is also provided with a plurality of mounting holes (not shown in the figure), which penetrate the printed circuit board 1 along the height direction of the battery pack circuit breaker unit to connect the first surface 11 and the second surface 12 of the printed circuit board 1. Each electrical component 2 is also provided with at least two connection terminals and at least two control terminals.

[0145] Among them, at least part of the electrical components 2 are electrically connected to the conductive area of ​​the first surface 11 of the printed circuit board 1 through the connecting end, and are electrically connected to the conductive area of ​​the second surface 12 of the printed circuit board 1 through the control end, so that the conductive area of ​​the first surface 11 can be electrically connected to the conductive area of ​​the second surface 12 through at least part of the electrical components 2.

[0146] Specifically, one connection end of the main relay 21 is electrically connected to the first copper bus 31, the other connection end of the main relay 21 is electrically connected to the second copper bus 21, and the two control ends of the main relay 21 are electrically connected to the seventh conductive segment 121; one connection end of the fast-charging relay 22 is electrically connected to the third copper bus 22, the other connection end of the fast-charging relay 22 is directly electrically connected to the negative fast-charging interface 134, and the two control ends of the fast-charging relay 22 are electrically connected to the seventh conductive segment 121; one connection end of the pre-charging relay 23 is electrically connected to the first conductive segment 111, the other connection end of the pre-charging relay 23 is electrically connected to the second conductive segment 112, and the two control ends of the pre-charging relay 23 are electrically connected to the seventh conductive segment 121; one connection end of the pre-charging resistor 24 is electrically connected to the second conductive segment 112, and the other connection end of the pre-charging resistor 24 is electrically connected to the It is electrically connected to the third conductive segment 113, and the two control ends of the pre-charging resistor 24 are electrically connected to the seventh conductive segment 121; one connecting end of the slow-charging fuse 25 is electrically connected to the third conductive segment 113, the other connecting end of the slow-charging fuse 25 is electrically connected to the fourth conductive segment 114, and the two control ends of the slow-charging fuse 25 are electrically connected to the seventh conductive segment 121; one connecting end of the heating fuse 26 is electrically connected to the third conductive segment 113, the other connecting end of the heating fuse 26 is electrically connected to the fifth conductive segment 115, and the two control ends of the heating fuse 26 are electrically connected to the seventh conductive segment 121; one connecting end of the heating relay 27 is electrically connected to the fifth conductive segment 115, the other connecting end of the heating fuse 27 is electrically connected to the sixth conductive segment 116, and the two control ends of the heating fuse 27 are electrically connected to the seventh conductive segment 121.

[0147] More specifically, the control ends of the main relay 21 and the fast-charging relay 22 and the connection ends and control ends of the pre-charging relay 23, the pre-charging resistor 24, the slow-charging fuse 25, the heating fuse 26 and the heating relay 27 are all welded to the conductive area of ​​the printed circuit board 1 by wave soldering to improve the stability and reliability of the connection between each component and the printed circuit board 1, thereby ensuring good transmission of current and signals between the components.

[0148] Therefore, the printed circuit board 1 in this embodiment also integrates a connector 210, which is electrically connected to the main relay 21, the fast charging relay 22, the pre-charging relay 23, the pre-charging resistor 24, the slow charging fuse 25, the heating fuse 26 and the heating relay 27 through the seventh conductive segment 121, so as to facilitate the battery management system to monitor the working status of the battery module, so that the battery management system can regulate the working status of each component when the battery module encounters abnormal conditions such as overcharging, over-discharging and overheating, thereby timely reducing the degree of damage to the battery module and improving the service life of the battery module.

[0149] In a specific embodiment, Figure 1 , Figure 3and Figure 8 As shown, the battery pack circuit breaker unit also includes a shell 4, and the shell 4 and the printed circuit board 1 are distributed along the height direction of the battery pack circuit breaker unit. The shell 4 is provided with at least a first through hole 41 and a second through hole 42. The main relay 21 is located in the first through hole 41 and abuts against the side wall of the first through hole 41. The fast charging relay 22 is located in the second through hole 42 and abuts against the side wall of the second through hole 42.

[0150] In the embodiment of the present application, the housing 4 is used to fix the electrical components 2 installed on the printed circuit board 1 to improve the overall structural stability of the battery pack circuit breaker unit. Specifically, during the assembly of the battery pack circuit breaker unit, the main relay 21 and the pre-charge relay 22 are first installed on the printed circuit board 1, and the printed circuit board 1 after the electrical components 2 are integrated is assembled with the housing 4, wherein the main relay 21 can pass through the first through hole 41 of the housing 4 and abut against its side wall, and the pre-charge relay 22 can pass through the second through hole 42 of the housing 4 and abut against its side wall. After the battery pack circuit breaker unit is assembled, the side wall of the first through hole 41 and the side wall of the second through hole 42 can clamp the main relay 21 and the pre-charge relay 22 respectively, so as to further improve the stability and reliability of the installation of the two.

[0151] Specifically, the side walls of the first through hole 41 and the second through hole 42 can extend upward at least a portion of the distance along the height direction of the battery pack circuit breaker unit relative to the upper surface of the shell 4 to increase the contact area between the side walls of each through hole and the main relay 21 and the pre-charging relay 22, thereby further improving the structural stability of the battery pack circuit breaker unit.

[0152] In a possible embodiment, the shell 4 also includes a third through hole (not marked in the figure), a fourth through hole (not marked in the figure), a fifth through hole (not marked in the figure), a sixth through hole (not marked in the figure), and a seventh through hole (not marked in the figure). During the assembly of the battery pack circuit breaker unit, the pre-charging relay 23 passes through the third through hole and abuts against its side wall, the pre-charging resistor 24 passes through the fourth through hole and abuts against its side wall, the slow charging fuse 25 passes through the fifth through hole and abuts against its side wall, the heating fuse 26 passes through the sixth through hole and abuts against its side wall, and the heating relay 27 passes through the seventh through hole and abuts against its side wall, so as to further improve the stability and reliability of the installation of the pre-charging relay 23, the pre-charging resistor 24, the slow charging fuse 25, the heating fuse 26 and the heating relay 27, thereby further improving the overall structural stability of the battery pack circuit breaker unit.

[0153] In another possible implementation, since the installation positions of the pre-charging relay 23, the pre-charging resistor 24, the slow charging fuse 25 and the heating fuse 26 are relatively close, the third through hole, the fourth through hole, the fifth through hole and the sixth through hole can be interconnected, which is beneficial to reduce the processing difficulty of the shell 4, simplify the production process of the shell 4, and improve the production efficiency of the shell 4.

[0154] In a specific embodiment, Figure 1 and Figure 3 As shown, the battery pack disconnecting unit further includes a plurality of insulating members 5 . Along the height direction of the battery pack disconnecting unit, the insulating members 5 are mounted on a side of the housing 4 away from the printed circuit board 1 , and the copper bus 3 is mounted on the housing 4 through the insulating members 5 .

[0155] In the embodiment of the present application, the insulating member 5 is used to isolate the copper busbar 3, the shunt 28 and the main fuse 29 from the printed circuit board 1, thereby reducing the possibility of the high voltage current flowing through the copper busbar 3, the shunt 28 and the main fuse 29 damaging the printed circuit board 1.

[0156] Specifically, during the assembly of the battery pack circuit breaker unit, after the shell 4 and the integrated printed circuit board 1 are assembled, each insulating component 5 is first installed on the side of the shell 4 away from the printed circuit board 1, and then the copper bus 3 is installed on the insulating component 5.

[0157] Among them, the insulating member 5 at least includes a first insulating member 51, a second insulating member 52, a third insulating member 53, a fourth insulating member 54, a fifth insulating member 55 and a sixth insulating member 56. One end of the first copper bar 31 is fixedly connected to the first insulating member 51 and electrically connected to the positive electrode interface 131 of the battery, and the other end of the first copper bar 31 is electrically connected to a connection end of the main relay 21; one end of the second copper bar 32 is fixedly connected to the second insulating member 52 and electrically connected to the positive fast charging interface 133 and the positive output interface 135, and the other end of the second copper bar 32 is electrically connected to the other connection end of the main relay 21; one end of the third copper bar 33 is fixedly connected to the third insulating member 53, and electrically connected to the negative output interface 136 and the negative slow charging interface 138, and the other end of the third copper bar 33 is fixedly connected to the fourth insulating member 54 and electrically connected to the negative output interface 136 of the heating film. The negative electrode interface 1310 is electrically connected to one end of the main fuse 29, and at the same time, the middle area of ​​the third copper bar 33 is also electrically connected to a connection end of the fast charging relay 22; one end of the fourth copper bar 34 is fixedly connected to the fifth insulating member 55, and is electrically connected to the other end of the main fuse 29, and the other end of the fourth copper bar 34 is electrically connected to one end of the shunt 28; one end of the fifth copper bar 35 is fixedly connected to the sixth insulating member 56, and is electrically connected to the negative electrode interface 132 of the battery, and the other end of the fifth copper bar 35 is electrically connected to the other end of the shunt 28, so as to improve the safety and reliability of the battery pack circuit breaker unit during operation while ensuring the current transmission efficiency.

[0158] In a possible implementation, the insulating member 5 may be mounted on the housing 4 by fasteners to facilitate assembly and disassembly of the battery pack disconnecting unit.

[0159] In a specific embodiment, Figure 3 As shown, the copper bar 3 also includes a sixth copper bar 36 and a seventh copper bar 37, one end of the sixth copper bar 36 is connected to the battery positive electrode interface 131, the other end of the sixth copper bar 36 is connected to the first conductive segment 111, one end of the seventh copper bar 37 is connected to the positive fast charging interface 133 and the positive output interface 135, the other end of the seventh copper bar 37 is connected to the third conductive segment 113, the shell 4 is also provided with a first baffle 43 and a second baffle 44, the sixth copper bar 36 is fitted with the first baffle 43, and the seventh copper bar 37 is fitted with the second baffle 44.

[0160] In the embodiment of the present application, the sixth copper busbar 36 can be used to connect the battery positive electrode interface 131, the first copper busbar 31 and the first conductive segment 111, and the seventh copper busbar 37 can be used to connect the positive fast charging interface 133, the positive output interface 135, the second copper busbar 32 and the third conductive segment 113, so that the pre-charging relay 23 and the pre-charging resistor 24 are connected in series through the second conductive segment 112 and are arranged in parallel with the main relay 21.

[0161] Specifically, the first baffle 43 is arranged adjacent to the first insulating member 51, the sixth copper bar 36 is fitted with the first baffle 43, and one end of the sixth copper bar 36 is fixedly connected to the first insulating member 51, and is electrically connected to the first copper bar 31 and the battery positive electrode interface 131, and the other end of the sixth copper bar 36 is electrically connected to the first conductive segment 111; the second baffle 44 is arranged adjacent to the second insulating member 52, the seventh copper bar 37 is fitted with the second baffle 44, and one end of the seventh copper bar 37 is fixedly connected to the second insulating member 52, and is electrically connected to the second copper bar 32, the positive fast charging interface 133 and the positive output interface 135, and the other end of the seventh copper bar 37 is electrically connected to the third conductive segment 113.

[0162] Therefore, in this embodiment, the main relay 21 and the pre-charging relay 23 and the pre-charging resistor 24 can be interconnected through the first copper bar 31, the second copper bar 32, the sixth copper bar 36, the seventh copper bar 37, the first conductive segment 111, the second conductive segment 112 and the third conductive segment 113, and then connected to the battery module through the battery positive electrode interface 131, the positive fast charging interface 133 and the positive output interface 135, so that the current in the battery pack circuit breaker unit can flow stably.

[0163] Among them, the sixth copper bar 36 is fitted with the first baffle 43, and the seventh copper bar 37 is fitted with the second baffle 44, which can increase the creepage distance to improve the safety of the battery pack circuit breaker unit during operation.

[0164] At the same time, the first copper bar 31 and the sixth copper bar 36 can be an integrally formed structure, and the second copper bar 32 and the seventh copper bar 37 can be an integrally formed structure, so as to further optimize the stability and reliability of current transmission between the first copper bar 31 and the sixth copper bar 36, and the second copper bar 32 and the seventh copper bar 37. When the first copper bar 31 and the sixth copper bar 36, and the second copper bar 32 and the seventh copper bar 37 are all integrally formed structures, the first baffle 43 and the second baffle 44 can also facilitate the installation of the first copper bar 31 and the second copper bar 32, so as to improve the installation efficiency of the copper bar 3.

[0165] An embodiment of the present application further provides a battery pack, which includes a battery module and a battery pack disconnecting unit, and the battery pack disconnecting unit is the battery pack disconnecting unit described above.

[0166] In the embodiment of the present application, one end of the battery module is electrically connected to the battery positive electrode interface 131 of the battery pack disconnect unit, and the other end of the battery module is electrically connected to the battery negative electrode interface 132 of the battery pack disconnect unit.

[0167] When the battery pack needs fast charging, the battery pack circuit breaker unit can switch to the fast charging mode so that the positive fast charging interface 133 and the negative fast charging interface 134 of the battery pack circuit breaker unit are electrically connected to the positive and negative poles of the charging device respectively, thereby making the battery module, the battery pack circuit breaker unit and the charging device interconnected to form a fast charging circuit, which is beneficial to improve the charging efficiency of the battery pack and shorten the charging time.

[0168] When the battery pack needs to be discharged, the battery pack circuit breaker unit can switch to the discharge mode so that the positive output interface 135 and the negative output interface 136 of the battery pack circuit breaker unit are respectively electrically connected to the positive and negative poles of the electrical device, thereby making the battery module, the battery pack circuit breaker unit and the electrical device interconnected to form a discharge circuit, which is beneficial to improving energy utilization efficiency.

[0169] When the battery pack needs to be slow charged, the battery pack circuit breaker unit can switch to the slow charging mode so that the positive slow charging interface 137 and the negative slow charging interface 138 of the battery pack circuit breaker unit are respectively electrically connected to the positive and negative poles of the charging device, thereby making the battery module, the battery pack circuit breaker unit and the charging device interconnected to form a slow charging circuit, which is beneficial to improve the stability and safety of the battery pack during the charging process, so that the battery pack can be in a good state of use, thereby facilitating extending the service life of the battery pack.

[0170] When the battery pack needs to be heated, the battery pack circuit breaker unit can switch to the heating mode so that the heating film positive electrode interface 139 and the heating film negative electrode interface 1310 of the battery pack circuit breaker unit are electrically connected to the positive and negative electrodes of the heating film respectively, thereby making the battery module, the battery pack circuit breaker unit and the heating film interconnected to form a heating circuit, which is beneficial to improve the working performance of the battery pack in a low temperature environment, thereby extending the service life of the battery pack.

[0171] The above describes in detail the structure, features and effects of the present application based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present application, but the present application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of the present application, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present application.

Claims

1. A battery pack disconnect unit, characterized in that: The battery pack disconnecting unit comprises: A printed circuit board, wherein the printed circuit board is provided with a battery positive electrode interface and a battery negative electrode interface; A main relay, the main relay is mounted on the printed circuit board and connected to the battery positive electrode interface and the battery negative electrode interface; A heating relay and a slow-charging fuse, wherein the heating relay and the slow-charging fuse are both mounted on the printed circuit board; A conductive connector, wherein the conductive connector is capable of connecting the heating relay and the main relay to form a heating circuit, and the conductive connector is capable of connecting the slow-charging fuse and the main relay to form a slow-charging circuit; Among them, the battery pack circuit breaker unit also includes a pre-charging relay and a pre-charging resistor, one end of the pre-charging relay and one end of the pre-charging resistor are connected in series, the other end of the pre-charging relay is connected to the battery positive electrode interface, and the other end of the pre-charging resistor is respectively connected to the heating relay and the slow charging fuse.

2. The battery pack disconnect unit according to claim 1, characterized in that: The printed circuit board is also provided with a heating film positive electrode interface and a heating film negative electrode interface. The battery pack circuit breaking unit also includes a heating fuse, which is installed on the printed circuit board. One end of the heating fuse is connected to the pre-charging resistor, and the other end of the heating fuse is connected to the heating relay. The other end of the heating relay is connected to the heating film positive electrode interface, and the battery negative electrode interface is connected to the heating film negative electrode interface.

3. The battery pack disconnect unit according to claim 1, characterized in that: The printed circuit board is also provided with a positive slow charging interface and a negative slow charging interface, one end of the slow charging fuse is connected to the pre-charging resistor, the other end of the slow charging fuse is connected to the positive slow charging interface, and the battery negative electrode interface is connected to the negative slow charging interface.

4. The battery pack disconnect unit according to claim 1, characterized in that: The conductive connector includes a copper busbar and a conductive segment, the conductive segment is arranged on the printed circuit board, the heating relay and the slow charging fuse are both connected to the pre-charging resistor through the conductive segment, the battery pack circuit breaking unit also includes a fast charging relay, the fast charging relay is installed on the printed circuit board, one end of the main relay is connected to the positive electrode of the battery module through the copper busbar, the other end of the main relay is connected to the positive electrode of the charging device through the copper busbar, one end of the fast charging relay is connected to the negative electrode of the battery module through the copper busbar, and the other end of the fast charging relay is directly connected to the negative electrode of the charging device to form a fast charging circuit.

5. The battery pack disconnect unit according to claim 4, characterized in that: The printed circuit board is also provided with a positive fast charging interface and a negative fast charging interface, one end of the fast charging relay is connected to the negative fast charging interface, the other end of the fast charging relay is connected to the battery negative electrode interface, and the battery positive electrode interface is connected to the positive fast charging interface.

6. The battery pack disconnect unit according to claim 1, characterized in that: The printed circuit board is also provided with a positive output interface and a negative output interface, one end of the main relay is connected to the battery positive interface, the other end of the main relay is connected to the positive output interface, and the battery negative interface is connected to the negative output interface.

7. The battery pack disconnecting unit according to any one of claims 1 to 6, characterized in that: The printed circuit board is also provided with a negative electrode output interface, a negative electrode slow charging interface and a heating film negative electrode interface, and the battery pack disconnecting unit also includes a fast charging relay; The battery pack circuit breaker unit also includes a shunt and a main fuse, one end of the shunt and one end of the main fuse are connected in series, the other end of the shunt is connected to the battery negative electrode interface, and the other end of the main fuse is respectively connected to the fast charging relay, the negative electrode output interface, the negative electrode slow charging interface and the heating film negative electrode interface.

8. The battery pack disconnect unit according to claim 7, characterized in that: The printed circuit board is also provided with a positive fast charging interface and a positive output interface, and the battery pack disconnecting unit further includes a first copper bar, a second copper bar, a third copper bar, a fourth copper bar and a fifth copper bar; One end of the main relay is connected to the battery positive electrode interface through the first copper busbar, and the other end of the main relay is connected to the positive electrode fast charging interface and the positive electrode output interface respectively through the second copper busbar; One end of the fast charging relay is connected to the main fuse, the negative electrode output interface and the negative electrode slow charging interface respectively through the third copper bar, the other end of the main fuse is connected to the shunt through the fourth copper bar, and the other end of the shunt is connected to the battery negative electrode interface through the fifth copper bar.

9. The battery pack disconnect unit according to claim 8, characterized in that: The printed circuit board is also provided with a positive electrode slow charging interface and a heating film positive electrode interface, and the battery pack disconnecting unit also includes a heating fuse; The printed circuit board is also provided with a first conductive segment, a second conductive segment, a third conductive segment, a fourth conductive segment, a fifth conductive segment and a sixth conductive segment; One end of the pre-charging relay is connected to the first copper busbar through the first conductive segment, the other end of the pre-charging relay is connected to the pre-charging resistor through the second conductive segment, the other end of the pre-charging resistor is respectively connected to the slow-charging fuse, the heating fuse and the second copper busbar through the third conductive segment, the other end of the slow-charging fuse is connected to the positive slow-charging interface through the fourth conductive segment, the other end of the heating fuse is connected to the heating relay through the fifth conductive segment, and the other end of the heating relay is connected to the positive electrode interface of the heating film through the sixth conductive segment.

10. The battery pack disconnect unit according to claim 7, characterized in that: The battery pack disconnect unit further includes a connector, and the printed circuit board is further provided with a seventh conductive segment; Along the height direction of the battery pack circuit breaking unit, the printed circuit board has a first surface and a second surface that are arranged opposite to each other, the main relay and the fast charging relay are both installed on the first surface, the connector is installed on the second surface, and is connected to the main relay and the fast charging relay through the seventh conductive segment.

11. The battery pack disconnecting unit according to claim 7, characterized in that: The battery pack disconnecting unit further includes a shell, the shell and the printed circuit board are distributed along the height direction of the battery pack disconnecting unit, the shell is provided with at least a first through hole and a second through hole, the main relay is located in the first through hole and abuts against the side wall of the first through hole, and the fast charging relay is located in the second through hole and abuts against the side wall of the second through hole; Along the height direction of the battery pack disconnecting unit, the side wall of the first through hole and the side wall of the second through hole both extend in a direction away from the printed circuit board relative to the housing.

12. The battery pack disconnect unit according to claim 11, characterized in that: The battery pack disconnecting unit further includes a plurality of insulating parts and a plurality of copper bars. Along the height direction of the battery pack disconnecting unit, the insulating parts are mounted on a side of the shell away from the printed circuit board, and the copper bars are mounted on the shell through the insulating parts.

13. The battery pack disconnect unit according to claim 9, characterized in that: The battery pack circuit breaking unit also includes a sixth copper bar and a seventh copper bar, one end of the sixth copper bar is connected to the battery positive electrode interface, the other end of the sixth copper bar is connected to the first conductive segment, one end of the seventh copper bar is connected to the positive fast charging interface and the positive output interface, the other end of the seventh copper bar is connected to the third conductive segment, the battery pack circuit breaking unit also includes a shell, the shell is also provided with a first baffle and a second baffle, the sixth copper bar is in contact with the first baffle, and the seventh copper bar is in contact with the second baffle.

14. A battery pack, characterized in that: The battery pack comprises: Battery module; A battery pack disconnecting unit, wherein the battery pack disconnecting unit is the battery pack disconnecting unit according to any one of claims 1 to 12; Among them, one end of the battery module is connected to the battery positive electrode interface, and the other end of the battery module is connected to the battery negative electrode interface.

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