Battery pack disconnecting unit and battery pack

Abstract

The present invention proposes a battery pack circuit breaker unit and a battery pack, which include a shell, a main control circuit board, a plurality of relay elements and a plurality of conductive copper bars for electrical connection between the relay elements; a plurality of installation cavities are arranged in the shell, the inner side of the installation cavity has a first positioning portion and a second positioning portion, the conductive copper bar is integrally injection molded in the shell, and the conductive copper bar has a connecting portion embedded in the second positioning portion; the relay element is horizontally arranged in the installation cavity, the top surface of the relay element is provided with a coil contact piece, the front side of the relay element is provided with an electrode contact bolted to the connecting portion, and the two opposite sides of the relay element away from the electrode contact are tightly matched with the first positioning portion; the main control circuit board is fixedly connected to the shell, and a first terminal plugged into the coil contact piece is welded on the main control circuit board. The present invention can realize the precise plug-in connection between the first terminal and the coil contact piece on the relay element, reduce the occurrence of mechanical stress, and improve the safety of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile BDU, and in particular to a battery pack disconnecting unit and a battery pack. Background Art

[0002] BDU (battery disconnect unit) refers to the battery pack disconnect unit, which is an important part of new energy vehicles. It provides charge and discharge control, circuit overload protection and other functions for the high-voltage system of new energy vehicles. Various types of relays are important components in the battery pack disconnect unit, providing support for the normal operation of the battery pack disconnect unit.

[0003] The existing BDU main control circuit board and various relays mainly use multi-way male and female terminal plug-in connection. Specifically, during the assembly process of the battery pack disconnect unit, usually various relays with pre-installed terminals are first assembled into the electrical box of the battery pack disconnect unit, and then the BDU main control circuit board with terminals installed is assembled on the electrical box to achieve the connection between the terminals on the BDU main control circuit board and the terminals on various relays. Since the relative positions between the terminals on the BDU main control circuit board are accurate, there is an assembly gap after the various relays are assembled into the electrical box, which leads to deviations in the relative positions between multiple relays and cannot guarantee that the terminals on the main control circuit board and the terminals on the various relays have high alignment connection accuracy. Although the male and female terminals can be barely plug-in connected during the actual assembly process, unpredictable large mechanical stress will be generated during the assembly process. During the driving process of the vehicle, the mechanical stress cannot be effectively released, which will cause the terminals on the main control circuit board or the relay to fall off, thereby affecting the normal operation of the battery pack disconnect unit. Summary of the invention

[0004] In view of this, the present invention proposes a battery pack circuit breaker unit and a battery pack. In the prior art, due to the position deviation and assembly gap between the male and female terminals of the BDU main control circuit board and various relays, the connection accuracy is not high, and unpredictable mechanical stress will be generated during the assembly process, which will cause the terminals on the main control circuit board or the relay to fall off during vehicle driving, affecting the normal operation of the battery pack circuit breaker unit.

[0005] The technical solution of the present invention is achieved in this way:

[0006] In a first aspect, the present invention provides a battery pack disconnect unit, which includes a housing, a main control circuit board, a plurality of relay elements, and a plurality of conductive copper bars for electrical connection between the relay elements;

[0007] The shell is provided with a plurality of installation cavities, the inner side of the installation cavities has first positioning parts relatively arranged along a first direction of the shell, and the inner side of the installation cavities has second positioning parts along a second direction of the shell, and the first direction and the second direction are perpendicular;

[0008] The conductive copper bar is integrally injection-molded in the housing, and has a connecting portion electrically connected to the relay element, wherein the connecting portion is vertically located on the second positioning portion located on the same side of the plurality of mounting cavities;

[0009] The relay element is horizontally arranged in the installation cavity, two coil contacts are arranged on the top surface of the relay element, an electrode contact is arranged on the front side of the relay element, the electrode contact is connected to the connecting part by bolts, and the two opposite sides of the relay element away from the electrode contact are tightly matched with the first positioning part;

[0010] The main control circuit board is horizontally located at the opening end of the installation cavity and is fixedly connected to the shell. A first terminal plugged with the coil contact piece is welded on the main control circuit board.

[0011] On the basis of the above technical solution, preferably, the first positioning portion includes a limit plate vertically fixed in the installation cavity, a notch is provided in the middle of the limit plate, an elastic plate flush with the inner wall of the limit plate is vertically fixed at the notch, a card slot is provided on the side wall of the elastic plate, a buckle connected to the card slot is provided on the side wall of the relay element, the spacing between the two limit plates is matched with the width gap of the relay element along the first direction, and a first supporting portion is provided on the upper end of the elastic plate facing the relay element.

[0012] On the basis of the above technical solution, preferably, the second positioning portion has two spaced-apart mounting portions, the mounting portions are formed by an inward depression of the outer wall of the shell, the mounting portion has an accommodating groove for accommodating the connecting portion on the side facing the mounting cavity, a connecting hole is provided on the connecting portion, and the connecting portion is passed through the connecting hole by bolts from the outside of the shell and is locked and connected to the electrode contact.

[0013] On the basis of the above technical solution, preferably, a plurality of positioning posts are arranged at intervals inside the shell, and positioning holes matching with the positioning posts are arranged on the main control circuit board.

[0014] On the basis of the above technical solution, preferably, the first terminal includes a tube sleeve with a flat structure, one end of the tube sleeve has a relatively arranged welding portion for cooperating with the welding hole of the main control circuit board for welding, the other end of the tube sleeve has a relatively arranged guide portion, the guide portion is folded toward the inside of the tube sleeve to form a clamping portion, and an insertion gap is formed between the two clamping portions, and the two clamping portions are used to clamp the coil contact after it is inserted into the insertion gap.

[0015] On the basis of the above technical solution, preferably, it also includes a plastic connector, which includes a connecting body, on which two first guide sleeves of a through structure are vertically arranged at intervals, the first guide sleeve is sleeved on the first terminal, and the center distance between the two first guide sleeves is equal to the center distance between the two coil contacts on the relay element, at least two mounting columns are arranged on the connecting body, and a mounting hole that is interference fit with the mounting column is opened on the main control circuit board.

[0016] On the basis of the above technical solution, preferably, at least one of the mounting parts has a mounting groove vertically opened on the side wall toward the mounting cavity, the mounting groove is connected with the accommodating groove, a sampling piece connected to the connecting part is vertically inserted in the mounting groove, the lower end of the sampling piece has a through hole corresponding to the position of the connecting hole, the bolt passes through the connecting hole and the through hole in sequence from the outside of the shell and locks the connecting part, the sampling piece and the electrode contact, the upper end of the sampling piece has a plug-in part, and a second terminal plugged into the plug-in part is welded on the main control circuit board, and the structure of the second terminal is the same as the structure of the first terminal.

[0017] On the basis of the above technical solution, preferably, two second guide sleeves with a through structure are vertically arranged at intervals on the connecting body, and the second guide sleeves are sleeved on the second terminal. The center distance between the two second guide sleeves is equal to the center distance between the two plug-in parts. The center distance between the first guide sleeve and the second guide sleeve on the same side is L1, and the center distance between the coil contact and the plug-in part on the same side is L2, wherein L1=L2.

[0018] Further, preferably, at least one hollow hole is opened on the connecting body, and a spring sheet is horizontally arranged in the hollow hole, one end of the spring sheet is fixedly connected to the connecting body, and the other end is bent to form a second supporting portion extending from the bottom of the connecting body.

[0019] In a second aspect, the present invention discloses a battery pack, comprising the battery pack disconnecting unit described in the first aspect.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The battery pack disconnecting unit disclosed in the present invention provides a first positioning portion and a second positioning portion in the installation cavity, and the conductive copper busbar is embedded in the shell, and the connecting portion of the conductive copper busbar is located at the second positioning portion, so that the positions of the multiple relay elements are fixed after being assembled inside the shell, and the relative position deviations between the multiple relay elements in the horizontal direction are eliminated to the maximum extent. Therefore, after the first terminal is pre-welded, the main control circuit board can be accurately plugged into the coil contact on the relay element inside the shell, thereby improving the alignment and assembly accuracy of the first terminal and the coil contact. On the one hand, all the first terminals on the main control circuit board can be quickly plugged into the corresponding coil contact on the relay element in the vertical direction. On the other hand, due to the improvement of the assembly accuracy, the occurrence of mechanical stress during the plug-in process of the coil contact and the first terminal and the subsequent use process can be reduced, thereby improving the reliability and safety of the battery pack disconnecting unit.

[0022] (2) The connecting portion of the conductive copper busbar is embedded in the receiving groove inside the mounting portion during injection molding, and the connecting portion is in a recessed structure at the end of the conductive copper busbar, so as to cooperate with the mounting portion of the recessed structure. Therefore, the connecting portion of the recessed structure is embedded in the mounting portion of the recessed structure, and the overall structural strength is more solid. When the connecting portion and the relay element are locked, due to the integrated structure of metal and plastic, the electrode contact of the relay element is bolted to the shell through the conductive copper busbar, thereby enhancing the mechanical strength of the connection between the relay element and the shell along the second direction. At the same time, after the relay element and the connecting portion in the second positioning portion are locked, the shell is structurally reinforced by the conductive copper busbar in the second direction, so that the relay element can be prevented from being displaced due to plastic deformation of the shell after the relay element is assembled in the second direction of the mounting cavity, thereby eliminating the relative position deviation between all the relay elements after they are assembled in the second direction of the mounting cavity, thereby improving the assembly accuracy of all the relay elements in the shell along the second direction.

[0023] (3) After each relay element is assembled in the mounting cavity, the relative position of each relay inside the housing is fixed under the action of the first positioning portion and the second positioning portion. This ensures that the relative position of the coil contacts on each relay element inside the housing is determined without position deviation, which meets the design accuracy requirements. When the main control circuit board with the first terminal is placed horizontally on the housing as a whole, each first terminal and the corresponding coil contact can be accurately plugged in through the positioning hole and the positioning column, thereby improving the alignment connection accuracy of the first terminal and the coil contact, thereby avoiding connection failure due to insufficient alignment accuracy and mechanical stress caused by forced connection.

[0024] (4) Through the setting of the plastic connector, the coil contact can be smoothly guided into the first terminal. Even when there is a certain positional deviation between the coil contact and the first terminal, since there is a certain alignment tolerance space between the first guide sleeve and the coil contact, the coil contact can be smoothly inserted into the first terminal under the guidance of the first guide sleeve, thereby avoiding connection failure or large mechanical stress caused by alignment deviation when the coil contact is alone and plugged into the first terminal without plastic connection. In addition, since the plastic connector and the main control circuit board are firmly fixed, during the insertion of the coil contact, the first guide sleeve can protect the first terminal, and the plastic connector can absorb and release the mechanical stress during the insertion of the first terminal and the coil contact, thereby avoiding displacement and distortion of the first terminal due to mechanical stress caused by alignment deviation when the coil contact is alone and plugged into the first terminal without plastic connection, thereby causing connection failure between the coil contact and the first terminal, and further causing a large safety hazard to the battery pack circuit breaker unit.

[0025] (5) By installing a sampling sheet between the electrode contact and the conductive copper busbar, by welding a second terminal on the main control circuit board, and using the second terminal and the sampling sheet to plug into each other, an electrical connection between the main control circuit board and the electrode contact is achieved, thereby reducing the use of wiring harnesses, making the assembly method simpler, and improving assembly efficiency.

[0026] (6) By vertically setting the sampling piece in the mounting groove of the mounting part, after the relay element passes through the conductive copper busbar in the second direction of the shell through bolts, and the sampling piece and the electrode contact are locked, on the one hand, it can ensure that all relay elements are in the same position in the second direction of the shell, eliminate the relative position deviation between all relay elements, and improve the assembly accuracy of all relay elements in the second direction inside the shell. On the other hand, it realizes the reliable connection between the relay element, the sampling piece and the conductive copper busbar. Since the sampling piece is inserted into the mounting groove, its own position is in a limited state, and at the same time, the relay element, the sampling piece and the conductive copper busbar are firmly mechanically connected. When the relative positions of all relay elements in the shell are unified, there will be no deviation in the relative positions of the sampling pieces on each relay element, so that it can be ensured that after the second terminal is welded on the main control circuit board, it can be accurately plugged and connected with the plug-in part at the upper end of the sampling piece.

[0027] (7) The provision of the second guide sleeve makes the connection mechanism more complete and stable, which not only ensures the connection accuracy between the first terminal and the coil contact piece, but also ensures the connection stability and reliability between the second terminal and the sampling piece.

[0028] (8) By arranging a spring sheet on the plastic connection and arranging a second supporting portion at the end of the spring sheet, when the main control circuit board, the first terminal, the second terminal and the plastic connector are assembled as a whole onto the shell, and the first terminal and the coil contact establish a plug-in relationship, and the second terminal and the sampling sheet establish a plug-in relationship, the plastic connector is located between the main control circuit board and the relay element. The main control circuit board can be supported by the plastic connector. At the same time, since there is a downward supporting force between the supporting portion of the spring sheet and the relay element, the plastic connector can be stably maintained between the main control circuit board and the relay element, and the plastic connector will not move up and down due to the vibration of the battery pack, thereby improving the protection of the plastic connector to the first terminal and the second terminal, and avoiding the problem of mechanical stress failure of the first terminal and the second terminal due to vibration when there is no plastic connector.

[0029] (9) The battery pack disclosed in the present invention uses a battery pack disconnect unit. Since the assembly positions of the multiple relay elements inside the shell are fixed and the relative position deviations between the multiple relay elements in the horizontal direction are eliminated to the maximum extent, the main control circuit board can be accurately plugged into the coil contacts and sampling pieces on the relay elements inside the shell after the first terminal and the second terminal are pre-welded, thereby improving the alignment and plugging accuracy between the first terminal and the coil contact, and the alignment and plugging accuracy between the second terminal and the sampling piece. On the one hand, it is convenient for all the terminals on the main control circuit board to be quickly plugged into the corresponding coil contacts and sampling pieces in the vertical direction. On the other hand, due to the improvement in assembly accuracy, the occurrence of mechanical stress during the plugging process between the coil contact and the first terminal, the plugging process between the sampling piece and the second terminal, and the subsequent use of the battery pack can be reduced, thereby improving the reliability and safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the battery pack disconnecting unit disclosed in the present invention;

[0032] Figure 2 It is a three-dimensional structural schematic diagram of the main control circuit board assembly disclosed in the present invention;

[0033] Figure 3 It is a schematic diagram of the internal structure of the battery pack disconnecting unit disclosed in the present invention;

[0034] Figure 4It is a schematic diagram of the assembly structure of the relay element disclosed in the present invention in the housing;

[0035] Figure 5 It is a schematic diagram of the three-dimensional structure of the housing disclosed in the present invention;

[0036] Figure 6 for Figure 5 A partial enlarged view of the middle part;

[0037] Figure 7 It is a schematic diagram of the assembly structure of the conductive copper busbar and the housing disclosed in the present invention;

[0038] Figure 8 It is a schematic diagram of the three-dimensional structure of the first terminal disclosed in the present invention;

[0039] Fig. 9 It is a schematic diagram of the three-dimensional structure of the plastic connector disclosed in the present invention;

[0040] Fig.10 It is a schematic diagram of the planar structure of the battery pack disconnecting unit disclosed in the present invention;

[0041] Fig.11 for Fig.10 Plane section view at BB in the middle;

[0042] Fig.12 for Fig.10 Plane section view at CC;

[0043] Fig.13 for Fig.12 A partial enlarged view of point D in the middle;

[0044] Reference numerals:

[0045] 1. Shell; 2. Main control circuit board; 3. Relay element; 4. Conductive copper bar; 5. First terminal; 41. Connecting part; 11. Mounting cavity; 12. First positioning part; 13. Second positioning part; 31. Coil contact piece; 32. Electrode contact; 121. Limiting plate; 122. Notch; 123. Elastic plate; 1231. Slot; 1232. First holding part; 33. Buckle; 1232. First holding part; 131. Mounting part; 132. Accommodating slot; 411 , connecting hole; 14, positioning column; 21, positioning hole; 51, sleeve; 52, welding part; 53, guide part; 54, clamping part; 6, plastic connector; 61, connecting body; 62, first guide sleeve; 611, mounting column; 22, mounting hole; 133, mounting groove; 7, sampling piece; 71, through hole; S, bolt; 72, plug-in part; 8, second terminal; 63, second guide sleeve; 612, hollow hole; 613, spring piece; 6131, second supporting part. DETAILED DESCRIPTION

[0046] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] like Figure 1 As shown, combined Figure 2-7 The battery pack circuit breaker unit disclosed in the embodiment of the present invention includes a housing 1, a main control circuit board 2, a plurality of relay elements 3 and a plurality of conductive copper bars 4 for electrical connection between the relay elements 3.

[0048] The housing 1 is a mounting box for the entire battery pack circuit breaker unit, which is made of plastic and is used to mount electrical components. The housing 1 disclosed in this embodiment is provided with a plurality of mounting cavities 11 for mounting relay components 3 .

[0049] In this embodiment, the relay element 3 is horizontally arranged in the installation cavity 11. It can be understood that the relay element 3 is in a horizontal position in the installation cavity 11. Such an arrangement can reduce the installation space of the relay element 3 in the shell 1, making the entire battery pack circuit breaker unit thinner and lighter, thereby reducing the space occupancy rate of the battery pack circuit breaker unit in the battery pack.

[0050] Two coil contacts 31 are provided on the top surface of the relay element 3, and an electrode contact 32 is provided on the front side of the relay element 3. The coil contact 31 is used to be electrically connected to the main control circuit board, and the coil contact 31 is used to be connected to the coil in the relay, so as to control the conduction or closing of the electrode contact 32. In this embodiment, two electrode contacts 32 are provided on the front side of the relay element 3, and the two electrode contacts 32 are respectively connected to the electrical circuit through the conductive copper bar 4. By closing the two electrode contacts 32, the conduction of the electrical circuit can be achieved, and by disconnecting the two electrode contacts 32, the electrical circuit can be cut off. Specifically, the conduction and closing of the two electrode contacts 32 are controlled by the internal coil of the relay. The coil contact 31, the electrode contact 32 and the control principle are all in the prior art. As a preferred embodiment, the connection between the electrode contact 32 and the conductive copper bar in this embodiment is a bolt hole structure, which is convenient for bolt locking connection with the conductive copper bar 4.

[0051] In this embodiment, the coil contact piece 31 on the relay element 3 needs to establish an electrical connection with the main control circuit board 2, so that the relay element 3 is turned off and controlled by the main control circuit board 2. In this embodiment, when the relay element 3 is horizontally installed in the installation cavity 11, the coil contact piece 31 is vertically upward. In this embodiment, the first terminals 5 are pre-welded on the main control circuit board 2, and then the main control circuit board 2 is horizontally placed at the opening end of the installation cavity 11. These first terminals 5 are used to be plugged with the coil contact piece 31, so that the relay element 3 and the main control circuit board 2 are electrically connected.

[0052] Since the battery pack circuit breaker unit requires multiple relay elements 3 to be installed in the mounting cavity 11 of the shell 1 respectively, and usually, there is a matching gap between the relay element 3 and the mounting cavity 11 after assembly, which leads to a position deviation between the relay elements 3 in the horizontal direction. Although the installation accuracy of the multiple first terminals 5 on the main control circuit board 2 can be achieved by tooling, the relative position accuracy between the multiple relay elements 3 cannot be guaranteed, so that the first terminals 5 on the main control circuit board 2 and the coil contacts 31 on each relay element 3 cannot have a high alignment connection accuracy. In the actual assembly process, there is a problem of being unable to assemble, or although the first terminal 5 and the coil contact 31 can be barely plugged and connected, unpredictable large mechanical stress will be generated during the assembly process. During the driving of the vehicle, the mechanical stress cannot be effectively released, which will cause the terminals on the main control circuit board 2 or the relay to fall off, thereby affecting the normal operation of the battery pack circuit breaker unit.

[0053] To this end, the solution adopted by the present invention is: the inner side of the installation cavity 11 of this embodiment has a first positioning portion 12 arranged relatively along the first direction of the housing 1, and the inner side of the installation cavity 11 has a second positioning portion 13 along the second direction of the housing 1, and the first direction and the second direction are perpendicular, so that the installation cavity 11 has a square structure, and is then adapted to be installed with the square-structured relay element 3. When the relay element 3 is assembled into the installation cavity 11, it is positioned by the first positioning portion 12 and the second positioning portion 13.

[0054] In order to ensure the relative position accuracy of multiple relay elements 3 inside the housing 1, in this embodiment, the conductive copper busbar 4 is integrally injection-molded in the housing 1. The conductive copper busbar 4 has a connecting portion 41 electrically connected to the relay element 3. The connecting portion 41 is vertically located on the second positioning portion 13 on the same side of the plurality of mounting cavities 11. When the relay element 3 is assembled into the mounting cavity 11, the electrode contact 32 on the front side of the relay element 3 contacts the connecting portion 41, and the two are locked and connected by a bolt S. Since the conductive copper busbar 4 and the housing 1 are integrally injection-molded, the connecting portion 41 of the conductive copper busbar 4 can be formed just in the second positioning portion 13. Since the second positioning portion 13 is a part of the housing 1, and the housing 1 itself is made of plastic material, it is easy to plasticize. Deformation, while the connecting portion 41 of the present embodiment is embedded in the housing 1, and after the connecting portion 41 and the electrode contact 32 of the relay element 3 are bolted together, the mechanical strength of the connection between the relay element 3 and the housing 1 along the second direction is enhanced, so that after the relay element 3 and the connecting portion 41 in the second positioning portion 13 are locked, the housing 1 is structurally reinforced by the conductive copper bus 4 in the second direction, which can avoid the relay element 3 from being displaced due to the plastic deformation of the housing 1 after the relay element 3 is assembled in the second direction of the mounting cavity 11, thereby eliminating the relative position deviation between all the relay elements 3 after they are assembled in the second direction of the mounting cavity 11, and improving the assembly accuracy of all the relay elements 3 in the housing 1 along the second direction.

[0055] In addition, the two opposite sides of the relay element 3 away from the electrode contact 32 are tightly matched with the first positioning portion 12. Thus, after all the relay elements 3 are assembled in the first direction of the mounting cavity 11, the relative position deviation between each other is eliminated, thereby improving the assembly accuracy of all the relay elements 3 along the first direction inside the housing 1.

[0056] Since the assembly positions of the multiple relay elements 3 inside the shell 1 are fixed, and the relative position deviations between the multiple relay elements 3 in the horizontal direction are eliminated to the maximum extent, the main control circuit board 2 can be accurately plugged into the coil contact 31 on the relay element 3 inside the shell 1 after the first terminal 5 is pre-welded, thereby improving the alignment and assembly accuracy of the first terminal 5 and the coil contact 31. On the one hand, it is convenient for all the first terminals 5 on the main control circuit board 2 to be quickly plugged into the corresponding coil contact 31 on the relay element 3 in the vertical direction. On the other hand, due to the improvement in assembly accuracy, the occurrence of mechanical stress during the plug-in process of the coil contact 31 and the first terminal 5 and the subsequent use process can be reduced, thereby improving the reliability and safety of the battery pack circuit breaker unit.

[0057] In order to eliminate relative position deviations between all relay elements 3 after being assembled in the first direction of the mounting cavity 11 , this embodiment shows a preferred structural mode of the first positioning portion 12 .

[0058] For details, please refer to the attached Figure 3-6 , combined with the attached Fig.10 and 11 As shown, the first positioning portion 12 includes a limiting plate 121 vertically fixed in the mounting cavity 11, and its function is to limit the position of the relay element 3 in the first direction. The spacing between the two limiting plates 121 and the width clearance of the relay element 3 along the first direction are matched, so that the relay element 3 can be easily inserted vertically between the two limiting plates 121.

[0059] In order to avoid the existence of an assembly gap between the relay element 3 and the first direction of the mounting cavity 11, a notch 122 is provided in the middle of the limiting plate 121 in this embodiment, and an elastic plate 123 flush with the inner wall of the limiting plate 121 is vertically fixed at the notch 122, and a card slot 1231 is provided on the side wall of the elastic plate 123, and a buckle 33 connected to the card slot 1231 is provided on the side wall of the relay element 3. Thus, when the relay element 3 is vertically inserted between the two elastic plates 123, it can be connected with the card slot 1231 on the elastic plate 123 through the buckle 33 of the side wall of the relay element 3. A first supporting portion 1232 is provided on the upper end of the side of the elastic plate 123 facing the relay element 3. The first supporting portion 1232 of this embodiment is located on the side wall of the elastic plate 123 directly above the card slot 1231, and the first supporting portion 1232 is a protrusion extending from the upper end of the side wall of the elastic plate 123. During the vertical assembly of the relay element 3, the buckle 33 passes over the first abutting portion 1232, squeezing the elastic plate 123, causing the elastic plate 123 to tilt in the direction away from the relay element 3 at the notch 122. When the buckle 33 completely enters the slot 1231 and the buckle 33 is connected to the slot 1231, due to the rebound of the elastic plate 123, the first abutting portion 1232 will abut the side wall of the relay element 3. Due to the connection between the buckle 33 and the slot 1231, the relay element 3 cannot vertically escape from the installation cavity 11. At the same time, the first abutting portions 1232 on the two elastic plates 123 respectively abut against the opposite side of the relay element 3, which can ensure that after all the relay elements 3 are assembled into the corresponding installation cavity 11, the relative positions of the relays in the first direction remain consistent, thereby improving the assembly accuracy of all the relay elements 3 along the first direction inside the housing 1.

[0060] In order to eliminate the relative position deviation between all relay elements 3 after being assembled in the second direction of the mounting cavity 11 , this embodiment shows a preferred structural mode of the second positioning portion 13 .

[0061] For details, please refer to the attached Figure 3-7, combined with 10 and 12, the second positioning portion 13 has two spaced mounting portions 131, and the two mounting portions 131 are respectively positioned and connected with the electrode contacts 32 on the relay element 3. In this embodiment, the mounting portion 131 has a receiving groove 132 for receiving the connecting portion 41 on the side facing the mounting cavity 11. The function of the receiving groove 132 is to ensure that the connecting portion 41 can be correctly embedded therein and maintain its stable position. It is worth noting that the mounting portion 131 of this embodiment is formed by the outer wall of the shell 1 being recessed inwardly. Thus, the connecting portion 41 is embedded in the receiving groove 132 inside the mounting portion 131 during injection molding. At the same time, the connecting portion 41 is a recessed structure at the end of the conductive copper bus 4, which is to cooperate with the recessed mounting portion 131. Therefore, the recessed connecting portion 41 is embedded in the recessed mounting portion 131, and the overall structural strength is more solid. When the connecting portion 41 and the relay element 3 are locked, due to the integrated structure of metal and plastic, the electrode contact 32 of the relay element 3 is secured in the shell through the conductive copper bus 4. After the bolts S on the body 1 are connected, the mechanical strength of the connection between the relay element 3 and the housing 1 along the second direction is enhanced. At the same time, after the relay element 3 and the connecting portion 41 in the second positioning portion 13 are locked, the housing 1 is structurally reinforced by the conductive copper bus 4 in the second direction, so that after the relay element 3 is assembled in the second direction of the installation cavity 11, the displacement of the relay element 3 due to the plastic deformation of the housing 1 can be avoided, so that the relative position deviation of all the relay elements 3 is eliminated after they are assembled in the second direction of the installation cavity 11, and the assembly accuracy of all the relay elements 3 in the second direction inside the housing 1 is improved.

[0062] In order to facilitate the bolt S connection between the conductive copper bar 4 and the relay element 3 on the housing 1, a connection hole 411 is provided on the connection part 41 in this embodiment, and the connection part 41 is passed through the connection hole 411 by the bolt S from the outside of the housing 1 and is locked with the electrode contact 32. According to this arrangement, after the relay element 3 passes through the conductive copper bar 4 and is locked with the electrode contact 32 in the second direction of the housing 1 by the bolt S, on the one hand, it can ensure that all relay elements 3 are in the same position in the second direction of the housing 1, eliminate the relative position deviation between all relay elements 3, and improve the assembly accuracy of all relay elements 3 in the second direction inside the housing 1. On the other hand, the relay element 3 and the conductive copper bar 4 are reliably connected. On the third aspect, since the conductive copper bar 4 and the housing 1 are integrally injection molded, the structure of the locking connection between the housing 1 and the relay element 3 is strengthened, and the structural stability of the relay element 3 and the housing 1 after assembly is improved. On the fourth aspect, the conductive copper bar 4 and the housing 1 are integrally injection molded, which avoids the conductive copper bar 4 being separately arranged on the inner side of the housing 1 to occupy space, and the assembly gap and position deviation caused by the connection process with the relay element 3 in the housing 1.

[0063] It is worth noting that if the conductive copper busbar 4 is separately arranged inside the shell 1, the relay element 3 needs to be assembled and positioned inside the shell 1 first, and then the conductive copper busbar 4 and the relay element 3 are assembled. In this way, when multiple components need to be assembled inside the shell 1, there will definitely be assembly gaps and relative position deviations. The conductive copper busbar 4 is embedded inside the shell 1, so that the shell 1 and the conductive copper busbar 4 form a whole, reducing the number of components that need to be assembled inside the shell 1, and naturally reducing the relative position deviation of the relay element 3 after assembly inside the shell 1, thereby improving the position accuracy of multiple relay elements 3 inside the shell 1, so that the main control circuit board 2 can be accurately plugged into the coil contact 31 on the relay element 3 inside the shell 1 after the first terminal 5 is pre-soldered, thereby improving the alignment and assembly accuracy of the first terminal 5 and the coil contact 31.

[0064] In order to ensure that the first terminals 5 on the main control circuit board 2 can be accurately plugged into the coil contacts 31 on each relay element 3 inside the shell 1, this embodiment also has a plurality of positioning posts 14 arranged at intervals inside the shell 1, and positioning holes 21 matching the positioning posts 14 are arranged on the main control circuit board 2.

[0065] With this arrangement, through the cooperation of the positioning column 14 and the positioning hole 21, precise positioning is achieved between the main control circuit board 2 and the shell 1. At the same time, in the initial stage of welding of each first terminal 5 on the main control circuit board 2, welding tooling can be used to ensure that the relative positions of these first terminals 5 on the main control circuit board 2 and the relative positions of the coil contacts 31 on each relay element 3 inside the shell 1 during product design are matched.

[0066] After each relay element 3 is assembled in the mounting cavity 11, under the action of the first positioning portion 12 and the second positioning portion 13, the relative position of each relay inside the housing 1 is fixed, which makes the relative position of the coil contact 31 on each relay element 3 inside the housing 1 determined, without position deviation, and meets the design accuracy requirements. When the main control circuit board 2 with the first terminal 5 is placed horizontally on the housing 1 as a whole, and then through the positioning hole 21 and the positioning column 14, each first terminal 5 and the corresponding coil contact 31 can be accurately plugged in, thereby improving the alignment connection accuracy of the first terminal 5 and the coil contact 31, thereby avoiding connection failure due to insufficient alignment accuracy and mechanical stress problems caused by forced connection.

[0067] In order to realize the plug-in connection between the first terminal 5 and the coil contact piece 31, this embodiment shows a structural mode of the first terminal 5. For details, refer to the attached Figure 8 and 13As shown, the first terminal 5 includes a sleeve 51 with a flat structure. This structural setting enables the first terminal 5 to better adapt to the shape of the coil contact piece 31. One end of the sleeve 51 has a welding portion 52 arranged oppositely, which is used to cooperate with the welding hole of the main control circuit board 2 for welding. This setting completes the welding between the first terminal 5 and the main control circuit board 2 by inserting the welding portion 52 into the welding hole of the main control circuit board 2, ensuring that the first terminal 5 and the main control circuit board 2 establish a reliable electrical connection. The other end of the sleeve 51 has a guide portion 53 arranged oppositely, and the guide portion 53 is folded toward the inside of the sleeve 51 to form a clamping portion 54, and an insertion gap is formed between the two clamping portions 54. The two clamping portions 54 are used to clamp the coil contact piece 31 after it is inserted into the insertion gap. This structural setting can guide the coil contact 31 during the insertion process through the relatively arranged guide parts 53. When the coil is inserted into the insertion gap between the two clamping parts 54, the coil contact 31 can be firmly clamped by the two clamping parts 54, which on the one hand plays a stable and firm mechanical connection, and on the other hand establishes a reliable electrical connection between the first terminal 5 and the coil contact 31 and the main control circuit board 2.

[0068] Preferably, the ends of the two clamping parts 54 away from the guide part 53 are inclined toward the axial direction of the inner part of the sleeve 51, so that the clamping is more stable and the reliability of the electrical connection contact is improved. As an embodiment, all parts of the first terminal 5 are made of metal conductive material. As other embodiments, the sleeve 51 in the first terminal 5 is made of plastic material, and the welding part 52, the guide part 53 and the clamping part 54 are integrated metal conductive sheets connected in sequence, which are molded together with the sleeve 51 by injection molding.

[0069] Although in the above embodiment, by structurally arranging the first positioning portion 12 and the second positioning portion 13 inside the installation cavity 11, and embedding the conductive copper bus 4 in the second positioning portion 13, including the positioning connection method between the main control circuit board 2 and the housing 1, the plug-in accuracy of each first terminal 5 and the coil contact 31 on the corresponding relay element 3 can be improved during the assembly of the main control circuit board 2 and the housing 1.

[0070] However, since the shell 1 is injection molded and is made of plastic, there are certain slight deformations, such as deformation caused by shrinkage, and some slight position deviations of the coil contact 31 after being assembled on the relay element 3. In addition, there will also be slight position deviations after the first terminal 5 is welded on the main control circuit board 2. These deviations accumulate and may cause the first terminal 5 and the coil contact 31 to not be able to be connected smoothly and accurately when they are plugged in. In some extreme cases, there may be a position deviation between the coil contact 31 and the first terminal 5, and the coil contact 31 may not be accurately inserted between the two clamping parts 54 in the first terminal 5, or the coil contact 31 may be inserted into the first terminal 5, causing greater mechanical stress, resulting in a safety hazard in the subsequent use of the battery pack circuit breaker unit.

[0071] To this end, this embodiment further designs the structure of the battery pack disconnecting unit on the basis of the above technical solution. Figure 2 and 9 As shown, the battery pack circuit breaker unit of this embodiment also includes a plastic connector 6, which includes a connecting body 61. Two first guide sleeves 62 with through structures are vertically arranged at intervals on the connecting body 61. The first guide sleeve 62 is sleeved on the first terminal 5. The inner wall of the first guide sleeve 62 and the outer wall of the sleeve 51 of the first terminal 5 are gap-matched to ensure that the first guide sleeve 62 can be smoothly sleeved on the first terminal 5. The center distance between the two first guide sleeves 62 is equal to the center distance between the two coil contacts 31 on the relay element 3. In this way, the entire plastic connector 6 can accurately sleeve the two first guide sleeves 62 on the corresponding first terminal 5 by plugging. At least two mounting posts 611 are arranged on the connecting body 61, and a mounting hole 22 with interference fit with the mounting posts 611 is opened on the main control circuit board 2.

[0072] By setting the mounting post 611, the entire plastic connector 6 is first plugged into the mounting hole 22 on the main control circuit board 2 through the mounting post 611 to realize the position positioning connection of the plastic connector 6 on the main control circuit board 2. When the mounting post 611 is plugged into the mounting hole 22, the first guide sleeve 62 and the first terminal 5 have a precise position correspondence. Therefore, after the plastic connector 6 is tightly assembled with the main control circuit board 2, the first guide sleeve 62 is completely sleeved on the corresponding first terminal 5, and the entire plastic connector 6 can be firmly fixed on the main control circuit board 2.

[0073] When each relay element 3 is assembled in the corresponding installation cavity 11, and the conductive copper busbar 4 is locked with the electrode contact 32 on the relay element 3, the first terminal 5, the plastic connector 6 and the main control circuit board 2 are assembled and placed in the open end of the housing 1, and pre-positioned through the positioning hole 21 on the main control circuit board 2 and the positioning column 14 inside the housing 1. In the process of the main control circuit board 2 approaching the relay element 3 downward, the plastic connector 6 first contacts the coil contact 31 on the relay element 3. Through the guidance of the plastic connector 6, the coil contact 31 can be smoothly guided into the first terminal 5. Even if there is a certain position correspondence deviation between the coil contact 31 and the first terminal 5, since the first guide sleeve 62 first has a certain alignment fault tolerance space with the coil contact 31, the coil contact 31 can be smoothly inserted into the first terminal 5 under the guidance of the first guide sleeve 62, so as to avoid connection failure or large mechanical stress caused by alignment deviation when the coil contact 31 is inserted into the first terminal 5 alone when there is no plastic connection. In addition, since the plastic connector 6 and the main control circuit board 2 are firmly fixed, during the insertion of the coil contact 31, the first guide sleeve 62 can protect the first terminal 5, and the entire plastic connector can absorb and release the mechanical stress during the insertion of the first terminal and the coil contact, thereby avoiding the displacement and distortion of the first terminal 5 due to mechanical stress caused by the alignment deviation when the coil contact 31 is inserted into the first terminal 5 alone when there is no plastic connection, thereby causing the connection between the coil contact 31 and the first terminal 5 to fail, thereby posing a greater safety hazard to the battery pack circuit breaker unit.

[0074] It is worth noting that the interference fit between the mounting column 611 on the connecting body 61 and the mounting hole 22 on the main control circuit board 2 can prevent the plastic connector 6 from falling off when plugged into the coil contact 31 after being assembled with the main control circuit board 2, thereby improving stability and reliability during the connection process.

[0075] In this embodiment, the conductive copper busbar 4 and the electrode contact 32 on the relay element 3 are electrically connected by bolt S connection. However, since the conductive copper busbar 4 also needs to be connected to an external load, it is necessary to collect high-voltage signals at the electrode contact 32 of the relay element 3, so that when high voltage or high current is overloaded, the battery pack circuit breaker unit can be disconnected in time through the collection of high-voltage signals to ensure the safety of the battery pack. In some prior arts, a wiring harness is usually connected between the electrode contact 32 of the relay element 3 and the main control circuit board. This method is complicated to operate and will cause more wiring harnesses to be arranged in the battery pack circuit breaker unit, reducing assembly efficiency.

[0076] To this end, the solution adopted in this embodiment is to install the sampling piece 7 between the electrode contact 32 and the conductive copper bus 4, and to realize the electrical connection between the main control circuit board 2 and the electrode contact 32 by welding the second terminal on the main control circuit board 2, and using the second terminal and the sampling piece 7 to plug in, thereby reducing the use of wiring harnesses, making the assembly method simpler, and improving assembly efficiency. However, in the actual assembly process, it is necessary to consider the assembly method of the sampling piece 7 between the electrode contact 32 and the conductive copper bus 4, and at the same time, it is necessary to ensure that after the sampling piece 7 is assembled, it can be accurately plugged in and connected with the second terminal.

[0077] Based on the above technical solution, this embodiment further improves and designs the structure of the battery pack disconnecting unit to solve the above technical problems.

[0078] For details, please refer to the attached Figure 6 and 12 As shown, at least one mounting portion 131 is vertically provided with a mounting groove 133 toward the side wall of the mounting cavity 11, and the mounting groove 133 is connected to the receiving groove 132, and the sampling piece 7 is vertically inserted in the mounting groove 133 and connected to the connecting portion 41. In the present embodiment, the mounting groove 133 is a structural position reserved during the injection molding of the shell 1, and the receiving groove 132 is formed by the connecting portion 41 being embedded in the mounting portion 131 of the shell 1 after the conductive copper bus 4 and the shell 1 are integrally formed. It can be understood that the connecting portion 41 is completely wrapped in the receiving groove 132, and the receiving groove 132 cannot be seen from the outside. According to the high-voltage sampling requirements of the battery pack circuit breaker unit, the two electrode contacts 32 on the relay element 3 are selectively installed with the sampling piece 7. Therefore, the mounting groove 133 is selectively set on at least one of the two mounting portions 131 spaced apart from each other in the mounting cavity 11, and the sampling piece 7 can be selectively installed according to actual needs.

[0079] The sampling piece 7 is vertically inserted in the mounting groove 133, which can ensure that the horizontal position of the sampling piece 7 is limited. The lower end of the sampling piece 7 has a through hole 71 corresponding to the position of the connection hole 411. The bolt S passes through the connection hole 411 and the through hole 71 from the outside of the housing 1 in sequence and locks the connection part 41, the sampling piece 7 and the electrode contact 32. The upper end of the sampling piece 7 has a plug-in portion 72, and the main control circuit board 2 is welded with a second terminal 8 that is plugged into the plug-in portion 72. The structure of the second terminal 8 is the same as that of the first terminal 5.

[0080] According to the arrangement, after the relay element 3 is locked with the electrode contact 32 through the bolt S through the conductive copper bar 4, the sampling piece 7 and the electrode contact 32 in the second direction of the housing 1, on the one hand, it can ensure that all the relay elements 3 are in the same position in the second direction of the housing 1, eliminate the relative position deviation between all the relay elements 3, and improve the assembly accuracy of all the relay elements 3 in the second direction inside the housing 1. On the other hand, it realizes the reliable connection between the relay element 3, the sampling piece 7 and the conductive copper bar 4. Since the sampling piece 7 is inserted into the installation groove 133, its own position is in a limited state, and at the same time, the relay element 3, the sampling piece 7 and the conductive copper bar 4 are firmly mechanically connected. When the relative positions of all the relay elements 3 in the housing 1 are unified, the relative positions of the sampling pieces 7 on each relay element 3 will not deviate, so that it can be ensured that after the second terminal 8 is welded on the main control circuit board 2, it can be accurately plugged and connected with the plug-in portion 72 at the upper end of the sampling piece 7.

[0081] It is worth noting that since the assembly position deviation of each relay element 3 in the housing 1 has been eliminated to the maximum extent, the relative positions of the coil contact 31 and the sampling piece 7 on the relay element 3 are unified, which ensures that after the main control circuit board 2 welded with the first terminal 5 and the second terminal 8 is placed on the housing 1 as a whole, the first terminal 5 and the coil contact 31 can be plugged and connected, and the second terminal 8 and the sampling piece 7 can be plugged and connected at one time, thereby improving the assembly efficiency and the plug-in connection accuracy of the main control circuit board 2 and the coil contact 31 and the sampling piece 7, avoiding connection failure or large mechanical stress due to accuracy problems.

[0082] In this embodiment, two second guide sleeves 63 with through structures are vertically arranged at intervals on the connection body 61, and the second guide sleeves 63 are sleeved on the second terminal 8. The center distance between the two second guide sleeves 63 is equal to the center distance between the two plug-in parts 72. Specifically, the second guide sleeve 63 can effectively guide the plug-in part 72 on the sampling piece 7 to be smoothly inserted into the second terminal 8, and the second guide sleeve 63 protects the second terminal 8. Overall, the technical effect of the second guide sleeve 63 is the same as the technical effect of the first guide sleeve 62.

[0083] The center distance between the first guide sleeve 62 and the second guide sleeve 63 on the same side is L1, and the center distance between the coil contact piece 31 and the plug-in portion 72 on the same side is L2, where L1=L2. This arrangement ensures that the positional relationship between the first terminal 5 and the second terminal 8 is consistent with the positional relationship between the coil contact piece 31 and the plug-in portion 72, thereby ensuring the stability and accuracy of the connection. The arrangement of the second guide sleeve 63 makes the connection mechanism more complete and stable, which not only ensures the connection accuracy between the first terminal 5 and the coil contact piece 31, but also ensures the connection stability and reliability between the second terminal 8 and the sampling piece 7.

[0084] Preferably, at least one hollow hole 612 is formed on the connecting body 61 , and a spring piece 613 is horizontally arranged in the hollow hole 612 . One end of the spring piece 613 is fixedly connected to the connecting body 61 , and the other end is bent to form a second supporting portion 6131 extending from the bottom of the connecting body 61 . Thus, when the whole formed by the main control circuit board 2, the first terminal 5, the second terminal 8 and the plastic connector 6 is assembled on the shell 1, and the first terminal 5 and the coil contact piece 31 establish a plug-in relationship, and the second terminal 8 and the sampling piece 7 establish a plug-in relationship, the plastic connector 6 is located between the main control circuit board 2 and the relay element 3, and the main control circuit board 2 can be supported by the plastic connector 6. At the same time, since there is a downward supporting force between the supporting part of the spring piece 613 and the relay element 3, the plastic connector 6 can be stably maintained between the main control circuit board 2 and the relay element 3, and the plastic connector 6 will not move up and down due to the vibration of the battery pack, thereby improving the protection of the plastic connector 6 to the first terminal 5 and the second terminal 8, and avoiding the problem of mechanical stress failure of the first terminal 5 and the second terminal 8 due to vibration when the plastic connector 6 is not present.

[0085] The present invention also provides a battery pack, including the battery pack circuit breaking unit disclosed in the above embodiment. Since the assembly positions of the multiple relay elements 3 inside the shell 1 are fixed, and the relative position deviations between the multiple relay elements 3 in the horizontal direction are eliminated to the maximum extent, the main control circuit board 2 can be accurately plugged with the coil contact 31 and the sampling piece 7 on the relay element 3 inside the shell 1 after the first terminal 5 and the second terminal 8 are pre-welded, thereby improving the alignment and plugging accuracy of the first terminal 5 and the coil contact 31, and the alignment and plugging accuracy of the second terminal 8 and the sampling piece 7. On the one hand, it is convenient for all the terminals on the main control circuit board 2 to be quickly plugged with the corresponding coil contact 31 and the sampling piece 7 in the vertical direction. On the other hand, due to the improvement of assembly accuracy, the occurrence of mechanical stress during the plugging process of the coil contact 31 and the first terminal 5, the plugging process of the sampling piece 7 and the second terminal 8, and the subsequent use of the battery pack can be reduced, thereby improving the reliability and safety of the battery pack.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack disconnect unit, comprising a housing (1), a main control circuit board (2), a plurality of relay elements (3) and a plurality of conductive copper bars (4) for electrically connecting the relay elements (3), characterized in that: A plurality of installation cavities (11) are arranged in the shell (1), the inner side of the installation cavity (11) has first positioning portions (12) arranged relatively along a first direction of the shell (1), and the inner side of the installation cavity (11) has second positioning portions (13) along a second direction of the shell (1), and the first direction and the second direction are perpendicular; The conductive copper busbar (4) is integrally injection-molded in the housing (1), and the conductive copper busbar (4) has a connecting portion (41) electrically connected to the relay element (3), and the connecting portion (41) is vertically located on the second positioning portion (13) located on the same side of the plurality of mounting cavities (11); The relay element (3) is horizontally arranged in the installation cavity (11); two coil contacts (31) are arranged on the top surface of the relay element (3); an electrode contact (32) is arranged on the front side of the relay element (3); the electrode contact (32) is connected to the connecting portion (41) by means of a bolt (S); and opposite sides of the relay element (3) away from the electrode contact (32) are tightly matched with the first positioning portion (12); A main control circuit board (2) is horizontally located at the opening end of the installation cavity (11) and is fixedly connected to the housing (1); a first terminal (5) is welded on the main control circuit board (2) and is plugged into the coil contact sheet (31); The first positioning portion (12) comprises a limiting plate (121) vertically fixedly arranged in the installation cavity (11); a notch (122) is provided in the middle of the limiting plate (121); an elastic plate (123) flush with the inner side wall of the limiting plate (121) is vertically fixedly arranged at the notch (122); a clamping groove (1231) is provided on the side wall of the elastic plate (123); a buckle (33) connected to the clamping groove (1231) is provided on the side wall of the relay element (3); the spacing between the two limiting plates (121) matches the width clearance of the relay element (3) along the first direction; and a first abutting portion (1232) is provided on the upper end of the elastic plate (123) facing the relay element (3).

2. The battery pack disconnect unit according to claim 1, wherein: The second positioning portion (13) has two installation portions (131) arranged at intervals, the installation portion (131) is formed by an inward depression of the outer wall of the shell (1), and the side of the installation portion (131) facing the installation cavity (11) has an accommodating groove (132) for accommodating the connecting portion (41), and the connecting portion (41) is provided with a connecting hole (411). The connecting portion (41) is passed through the connecting hole (411) by a bolt (S) from the outside of the shell (1) and is locked and connected to the electrode contact (32).

3. The battery pack disconnect unit according to claim 2, wherein: A plurality of positioning posts (14) are arranged at intervals inside the housing (1), and positioning holes (21) matching with the positioning posts (14) are arranged on the main control circuit board (2).

4. The battery pack disconnect unit according to claim 1, wherein: The first terminal (5) comprises a flat sleeve (51), one end of the sleeve (51) having a welding portion (52) arranged oppositely for welding with a welding hole of a main control circuit board (2), the other end of the sleeve (51) having a guide portion (53) arranged oppositely, the guide portion (53) being folded toward the inside of the sleeve (51) to form a clamping portion (54), a plug-in gap being formed between the two clamping portions (54), and the two clamping portions (54) being used to clamp the coil contact piece (31) after it is inserted into the plug-in gap.

5. The battery pack disconnect unit according to claim 3, wherein: The invention also comprises a plastic connector (6), wherein the plastic connector (6) comprises a connecting body (61), on which two first guide sleeves (62) with a through structure are vertically arranged at intervals, the first guide sleeves (62) are sleeved on the first terminal (5), the center distance between the two first guide sleeves (62) is equal to the center distance between the two coil contact pieces (31) on the relay element (3), at least two mounting posts (611) are arranged on the connecting body (61), and a mounting hole (22) which is interference fit with the mounting post (611) is opened on the main control circuit board (2).

6. The battery pack disconnect unit according to claim 5, characterized in that: At least one of the mounting portions (131) is provided with a mounting groove (133) vertically disposed on the side wall facing the mounting cavity (11); the mounting groove (133) is communicated with the receiving groove (132); a sampling piece (7) connected to the connecting portion (41) is vertically inserted in the mounting groove (133); the lower end of the sampling piece (7) has a through hole (71) corresponding to the position of the connecting hole (411); the bolt (S) passes through the connecting hole (411) and the through hole (71) in sequence from the outside of the housing (1) and locks the connecting portion (41), the sampling piece (7) and the electrode contact (32) together; the upper end of the sampling piece (7) has a plug-in portion (72); a second terminal (8) plugged into the plug-in portion (72) is welded on the main control circuit board (2); the structure of the second terminal (8) is the same as that of the first terminal (5).

7. The battery pack disconnect unit according to claim 6, wherein: The connecting body (61) is also provided with two second guide sleeves (63) with a through structure at intervals and vertically arranged thereon. The second guide sleeves (63) are sleeved on the second terminal (8). The center distance between the two second guide sleeves (63) is equal to the center distance between the two plug-in parts (72). The center distance between the first guide sleeve (62) and the second guide sleeve (63) on the same side is L1. The center distance between the coil contact piece (31) and the plug-in part (72) on the same side is L2, wherein L1=L2.

8. The battery pack disconnect unit according to claim 7, wherein: At least one hollow hole (612) is provided on the connecting body (61), and a spring sheet (613) is horizontally arranged in the hollow hole (612). One end of the spring sheet (613) is fixedly connected to the connecting body (61), and the other end is bent to form a second supporting portion (6131) extending from the bottom of the connecting body (61).

9. A battery pack, characterized in that: A battery pack disconnect unit comprising the battery pack disconnect unit as claimed in any one of claims 1 to 8.

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