Fully integrated BDMU with floating connection

Abstract

The invention relates to a floating-connection fully-integrated BDMU, which comprises a BMS integrated module, the BMS integrated module is provided with a substrate, a positive loop, a negative loop, a pre-charging loop and a control loop are integrated on the substrate, the positive loop is provided with a main positive relay and a main fuse, the pre-charging loop is connected in parallel with the main positive relay, the pre-charging loop is provided with a pre-charging relay and a pre-charging resistor, and the control loop is connected in parallel with the main positive relay. The pre-charging relay and the pre-charging resistor are both integrated on the substrate. The negative electrode loop is provided with a main negative relay and a diverter. The main positive relay, the main fuse, the main negative relay and the shunt are electrically connected through copper bars; the substrate is provided with a floating terminal which is connected with a pin of an electric device or a copper bar. The completely integrated BDMU in floating connection can effectively solve the problems that a BMS module and an electric device are complex in signal acquisition and control loop connection structure, connection of a male end and a female end is easy to loosen, poor contact is easy to fall off, micro-motion corrosion occurs and the like, so that circuit faults and even vehicle fire risks are caused.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a fully integrated BDMU with floating connection. Background Art

[0002] With the development of technology, BDU, as an important component of the battery pack, has attracted more and more attention in terms of intelligence and integration, in addition to safety and reliability as the most basic performance. Traditional BDU requires wiring harnesses to connect various electrical components for detection and control. This method occupies a large space inside the battery system, resulting in a messy and unsightly product, low efficiency, loose terminals, and wire ends falling off, resulting in circuit failures and vehicle fires.

[0003] At present, there are also cases of BDUs with integrated wireless bundles on the market. This is a wireless bundle BDU that connects control and detection signals through PCB. Compared with the traditional wired connection method, it has the advantages of simple wiring, strong anti-interference ability, and convenient maintenance. In this connection method, the BMS module and electrical components have problems such as signal acquisition, complex control circuit connection structure, loose male and female connections, poor contact and easy to fall off, and micro-motion corrosion. Summary of the invention

[0004] The embodiment of the present invention provides a fully integrated BDMU with floating connection, which can effectively address the risks of circuit failure and even vehicle fire caused by complex docking structure of control circuit, acquisition circuit and PCB interface, loose connection terminals, poor contact, easy falling off, micro-motion corrosion, etc.

[0005] In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:

[0006] A fully integrated BDMU with floating connection includes a BMS integrated module, wherein the BMS integrated module is provided with a substrate, on which a positive circuit, a negative circuit, a pre-charging circuit, multiple control circuits and a signal acquisition circuit are integrated, the positive circuit is provided with a main positive relay and a main fuse, the pre-charging circuit is connected in parallel with the main positive relay, the pre-charging circuit is provided with a pre-charging relay and a pre-charging resistor, the pre-charging relay and the pre-charging resistor are integrated on the substrate, the negative circuit is provided with a main negative relay and a shunt, the BMS integrated module controls the main positive relay, the main negative relay, the pre-charging relay and the shunt respectively through multiple control circuits, and the BMS integrated module collects electrical signals of the main positive relay and the main negative relay respectively through a signal acquisition circuit; the main positive relay, the main fuse, the main negative relay and the shunt are electrically connected through a copper busbar; the substrate is provided with a floating terminal connected to the pins or copper busbars of the electrical device.

[0007] Furthermore, the positive pole of the main fuse is connected to the positive current-carrying copper busbar, the negative pole of the main fuse is connected to the high-voltage positive pole of the main positive relay through the first current-carrying copper busbar, and the high-voltage negative pole of the main positive relay is connected to the second current-carrying copper busbar; the high-voltage positive pole of the main negative relay is connected to the third current-carrying copper busbar, and the high-voltage negative pole of the main negative relay is connected to the shunt through the fourth current-carrying copper busbar; the positive and negative low-voltage control pins of the main positive relay, the positive and negative low-voltage control pins of the main negative relay, the pins of the first current-carrying copper busbar, the pins of the second current-carrying copper busbar, and the pins of the third current-carrying copper busbar are all connected to the corresponding floating terminals on the substrate.

[0008] Furthermore, the floating terminal comprises a terminal bracket, on which at least one group of symmetrically arranged clamping springs are provided, elastic clamping is formed between the symmetrically arranged clamping springs, and a welding pin is provided at the bottom of the terminal bracket.

[0009] Furthermore, the clamping area of ​​the clamping spring is provided with at least one bend.

[0010] Furthermore, an elastic bend is provided between the terminal bracket and the welding pin.

[0011] Furthermore, a heating circuit is integrated on the substrate, and a heating relay and a heating fuse are provided on the heating circuit.

[0012] Furthermore, the heating relay and the heating fuse are integrated on a substrate.

[0013] Furthermore, the pre-charging relay and the pre-charging resistor are integrated on a substrate.

[0014] Furthermore, the BMS integrated module is fixed in an outer shell, and the outer shell includes a lower shell assembly and an upper cover assembly, the lower shell assembly and the upper cover assembly are detachably connected, and an installation position and an assembly gap of the BMS integrated module are provided between the lower shell assembly and the upper cover assembly.

[0015] Furthermore, one end of the second current-carrying copper busbar and the third current-carrying copper busbar are led out to the outside of the upper cover assembly and fixed on the upper cover assembly, and a protective cover covering the second current-carrying copper busbar and the third current-carrying copper busbar is provided on the outside of the upper cover assembly.

[0016] The embodiments of the present invention have the following advantages:

[0017] The fully integrated BDMU with a floating connection of the present invention integrates the traditional independent BMS with signal acquisition, control circuit, pre-charging circuit and heating circuit, and has better optimization for the traditional wired connection mode and the existing zero wiring harness, which can effectively solve the risk of circuit failure and even vehicle fire caused by the complex structure of signal acquisition and control circuit connection between BMS module and electrical components, loose connection between male and female ends, easy falling off due to poor contact and micro-motion corrosion. Moreover, this technology not only saves the space of traditional wired connection, but also saves the installation space of traditional independent BMS, greatly reduces the size of BDU, and then reduces the use space of BDU in the battery pack, making it easier to realize automated production.

[0018] A fully integrated BDMU with a floating connection of the present invention uses a floating terminal to achieve the connection between the electrical device and the BMS integrated module, which can achieve an elastic connection between the two, reduce the fretting corrosion caused by vibration, and increase the stability of the connection and the service life of the electrical device while meeting its electrical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0021] Figure 1 A circuit diagram of a fully integrated BDMU with floating connection provided by an embodiment of the present invention;

[0022] Figure 2 A product structure diagram of a fully integrated BDMU with floating connection provided by an embodiment of the present invention;

[0023] Figure 3 A structural diagram of a substrate in a fully integrated BDMU with floating connection provided by an embodiment of the present invention;

[0024] Figure 4 A diagram showing the connection structure of electrical components in a fully integrated BDMU with floating connection provided by an embodiment of the present invention;

[0025] Figure 5 A product structure diagram of a floating terminal in a fully integrated BDMU with floating connection provided in Embodiment 1 of the present invention;

[0026] Figure 6 A diagram showing the internal structure of a floating terminal in a fully integrated BDMU with floating connection provided in Embodiment 1 of the present invention;

[0027] Figure 7 A diagram showing the internal structure of a floating terminal in a fully integrated BDMU with floating connection provided in Embodiment 2 of the present invention;

[0028] Figure 8 A product structure diagram of a floating terminal in a fully integrated BDMU with floating connection provided in Embodiment 3 of the present invention;

[0029] Fig. 9 An assembly diagram of a fully integrated BDMU with floating connection provided by an embodiment of the present invention;

[0030] Fig.10 for Fig. 9 Exploded diagram.

[0031] In the figure:

[0032] 1. BMS integrated module; 2. Positive circuit; 3. Negative circuit; 4. Pre-charge circuit; 5. Control circuit; 6. Signal acquisition circuit; 7. Main positive relay; 8. Main fuse; 9. Pre-charge relay; 10. Pre-charge resistor; 11. Main negative relay; 12. Shunt; 13. Base plate; 14. Floating terminal; 15. Positive current-carrying copper bar; 16. First current-carrying copper bar; 17. Second current-carrying copper bar; 18. Third current-carrying copper bar; 19. Fourth current-carrying copper bar; 20. Main positive relay Positive low voltage control pin; 21. Negative low voltage control pin of main positive relay; 22. Positive low voltage control pin of main negative relay; 23. Negative low voltage control pin of main negative relay; 24. Negative current-carrying copper busbar; 25. Lead-out conductor; 26. Terminal bracket; 27. Clamping spring; 28. Welding pin; 29. ​​Clamping bend; 30. End bend; 31. Elastic bend; 32. Lower shell assembly; 33. Upper cover assembly; 34. Heating relay; 35. Heating fuse; 36. Protective cover. DETAILED DESCRIPTION

[0033] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are 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.

[0034] Figure 1 This is a circuit diagram of a fully integrated BDMU with floating connection in the present technology, which includes a BMS integrated module 1, a positive circuit 2, a negative circuit 3, a pre-charging circuit 4, multiple control circuits 5 and a signal acquisition circuit 6. The positive circuit 2 is provided with a main positive relay 7 and a main fuse 8, the pre-charging circuit 4 is connected in parallel with the main positive relay 7, and the pre-charging circuit 4 is provided with a pre-charging relay 9 and a pre-charging resistor 10; the negative circuit 3 is provided with a main negative relay 11 and a shunt 12.

[0035] The BMS integrated module 1 is provided with a control circuit 5 between the main positive relay 7, the main negative relay 11, the pre-charge relay 9 and the shunt 12 respectively. The BMS integrated module 1 controls the opening and closing of the main positive relay 7, the pre-charge relay 9 and the main negative relay 11 respectively through multiple low-voltage control circuits 5.

[0036] The BMS integrated module 1 is provided with a collection circuit between the main positive relay 7 and the main negative relay 11, and collection points are provided on both sides of the main positive relay 7 and one side of the main negative relay 11, so that the BMS integrated module 1 can collect signals from the main positive relay 7 and the main negative relay 11. The BMS integrated module 1 controls the opening and closing of the main positive relay 7, the pre-charge relay 9, and the main negative relay 11 through multiple low-voltage control circuits 5.

[0037] It also includes a heating circuit, on which a heating relay 34 and a heating fuse 35 are provided. The BMS integrated module 1 controls the switch of the heating relay 34 through a low-voltage circuit.

[0038] Figure 2 Based on Figure 1 The circuit diagram of a floating connected fully integrated BDMU is shown in FIG. Figure 3 As shown, the BMS integrated module 1 is provided with a substrate 13, on which a positive circuit 2, a negative circuit 3, a pre-charging circuit 4, a plurality of control circuits 5 and a signal acquisition circuit 6 are integrated, wherein smaller electrical components can be directly integrated on the substrate 13, such as a pre-charging relay 9, a pre-charging resistor 10, a heating relay 34, a heating fuse 35, etc. can all be integrated on the substrate 13, and the remaining larger electrical components are connected to the electrical component pins or copper busbars through floating terminals 14.

[0039] like Figure 4 As shown, the main positive relay 7, the main fuse 8, the main negative relay 11, and the shunt 12 are electrically connected through copper bars. Specifically, the positive electrode of the main fuse 8 is connected to the positive current-carrying copper bar 15, the negative electrode of the main fuse 8 is connected to the high-voltage positive electrode of the main positive relay 7 through the first current-carrying copper bar 16, and the high-voltage negative electrode of the main positive relay 7 is connected to the second current-carrying copper bar 17; the high-voltage positive electrode of the main negative relay 11 is connected to the third current-carrying copper bar 18, and the high-voltage negative electrode of the main negative relay 11 is connected to the shunt 12 through the fourth current-carrying copper bar 19, and one end of the shunt 12 is connected to the negative current-carrying copper bar 24. The positive low-voltage control pin 20 and the negative low-voltage control pin 21 of the main positive relay 7, the positive low-voltage control pin 22 and the negative low-voltage control pin 23 of the main negative relay 11, the lead-out conductor 25 of the first current-carrying copper bus 16, the lead-out conductor 25 of the second current-carrying copper bus 17, and the lead-out conductor 25 of the third current-carrying copper bus 18 are all connected to the corresponding floating terminals 14 on the substrate 13 to achieve electrical performance connection. The lead-out conductor 25 of the current-carrying copper bus can be a pin, a plug pin, etc. of an electrical component.

[0040] The multiple signal acquisition circuits 6 respectively collect electrical signals from the main positive relay 7 and the main negative relay 11. The BMS integrated module 1 is provided with acquisition points (U3) at both ends (U1 and U2) of the main positive relay 7 and one end of the main negative relay 11. Therefore, a separate lead-out conductor 25 needs to be provided on the current-carrying copper busbars of the main positive relay 7 and the main negative relay 11. The lead-out conductor 25 is connected to the floating terminal 14 on the BMS integrated module 1, which greatly simplifies the circuit structure.

[0041] The above-mentioned electrical architecture can replace traditional wiring harness solutions and welding solutions. Compared with the existing technology, the electrical architecture has a more reliable structure and avoids the stress problem caused by welding between electrical components and PCB during installation and use. Moreover, the electrical architecture has a compact structure and zero wiring harness, which can achieve a high degree of automation.

[0042] The present technology uses a floating terminal 14 to realize the electrical connection between the electrical component and the substrate 13. The arc-shaped structure of the floating terminal 14 can reduce the friction between the male and female ends, maintain its elasticity and reduce the fretting corrosion caused by vibration. Specifically, the floating terminal 14 includes a terminal bracket 26, and the terminal bracket 26 is provided with at least one group of symmetrically arranged clamping springs 27, and the symmetrically arranged clamping springs 27 form an elastic clamping, and the bottom of the terminal bracket 26 is provided with a welding pin 28. The clamping area of ​​the clamping spring 27 is provided with at least one clamping bend 29. An elastic bend 31 is provided between the terminal bracket 26 and the welding pin 28.

[0043] The floating connection terminal used in the present invention has three implementation modes, which are as follows:

[0044] Example 1

[0045] like Figure 5-6 As shown, the terminal bracket 26 of the floating terminal 14 is a cylindrical structure, and welding pins 28 are provided on both sides of the bottom of the terminal bracket 26. The welding pins 28 are welded to the substrate 13. In this embodiment, the floating terminal 14 adopts 0.35mm thick C7025 copper alloy or other forms of soft high-conductivity copper alloy such as C19010, with a pull-out force of 5-8kg, a core load current of 15A, a salt spray of 48H, and is adapted to a 0.8mm male terminal.

[0046] The clamping spring 27 is bent outward, upward, and then inward from both sides of the top of the terminal bracket 26 to form a circular bending structure. The clamping springs 27 symmetrically arranged on both sides are arranged opposite to each other and squeezed against each other, so that a clamping force is formed between the clamping springs 27. The lead-out conductor 25 of the current-carrying copper bus is inserted between the clamping springs 27 and is tightened by the clamping springs 27 on both sides. If internal stress is formed between the lead-out conductor 25 and the clamping spring 27, the elasticity of the clamping spring 27 can offset the internal stress. The floating terminal 14 adopts a design of wide at the top and narrow at the bottom, which can reduce micro-movement without increasing the clamping force.

[0047] The end of the clamping bend 29 of the clamping spring 27 is also provided with an upwardly bent end bend 30, and there is a gap between the end bend 30 and the inner wall of the terminal bracket 26, with a support spacing of 0.5mm, so that the male end remains in a fixed state, reducing the friction between the male and female ends, maintaining its elasticity while reducing the micro-corrosion caused by vibration, and preventing the clamping spring 27 from being excessively bent due to connection stress or excessive vibration, thereby weakening the clamping force and causing poor contact.

[0048] Example 2

[0049] Figure 7 It is a cross-sectional schematic diagram of the floating terminal core of Example 2. The terminal bracket 26 of the floating terminal 14 is a flat and long structure. An insulating terminal shell is provided on the outside of the terminal bracket 26. Welding pins 28 are provided on both sides of the bottom of the terminal shell. The welding pins 28 are welded to the substrate 13. The terminal shell is used to isolate the terminal bracket 26 from the welding pins 28 to better protect the terminal.

[0050] The terminal housing is provided with an embedding groove for embedding the terminal bracket 26. The terminal bracket 26 is fixed in the embedding groove. Clamping springs 27 are symmetrically provided on both sides of the bottom of the terminal bracket 26. The clamping area of ​​the clamping spring 27 is provided with at least one clamping bend 29. This structure allows the terminal bracket 26 and the clamping spring 27 to be buried in the embedding groove, isolating the clamping spring 27 from the outside to prevent leakage or dust. In this embodiment, the floating terminal 14 is a flat and long structure, and the terminal core is also suitable for a 6.3mm*0.8mm male terminal. In this embodiment, one implementation method is that the terminal core 26 has a total length of 7.66mm and a total width of 2.562mm (measured on the digital model); the inner length of the terminal core is 6.86mm and the inner width is 1.762mm. After the male terminal is inserted, the detuning absorption characteristics can reach ±0.6mm on the X axis and Y axis. The internal terminal structure can effectively prevent damage to the components on the substrate 13.

[0051] Example 3

[0052] like Figure 8 As shown, in this embodiment, the floating terminal 14 adopts a double-layer structure, and an elastic layer is added between the terminal bracket 26 and the welding pin 28, wherein welding pins 28 are provided on both sides of the lower terminal bracket 26, and the lower terminal bracket 26 is welded to the substrate 13.

[0053] There is a gap between the lower terminal bracket 26 and the upper terminal bracket 26, and elastic bends 31 are symmetrically arranged on both sides. The elastic bends 31 are U-shaped bend structures, and the two ends of the U-shaped bend structure are respectively connected to the lower terminal bracket 26 and the upper terminal bracket 26. On the one hand, this structure realizes the connection between the upper and lower layers, and on the other hand, it allows a certain elastic floating between the lower terminal bracket 26 and the upper terminal bracket 26, which can improve the fault tolerance deviation.

[0054] Two clamping springs 27 bent inward are symmetrically arranged in the middle of the upper terminal bracket 26, and at least one clamping bend 29 is provided on the clamping area of ​​the clamping spring 27. When the lead-out conductor 25 is inserted into the gap between the two clamping bends 29, the clamping spring 27 can elastically clamp the lead-out conductor 25, thereby realizing an elastic electrical connection between the lead-out conductor 25 and the substrate 13, and the lead-out conductor 25 can be pulled out.

[0055] like Figure 9-10As shown, in order to simplify the product structure, the BMS integrated module 1 and each electrical component are fixed in the outer shell, and the outer shell includes a lower shell component 32 and an upper cover component 33. The lower shell component 32 and the upper cover component 33 are detachably connected. In this technology, the BMS integrated module 1 and the installed electrical components are respectively installed on both sides of the upper cover component 33. The upper cover component 33 is provided with through holes for the lead-out conductors 25 on the BMS integrated module 1 and each electrical component to pass through. The lower shell component 32 wraps the BMS integrated module 1 and each electrical component installed on the upper cover component 33 from all sides, so that each electrical component is isolated from the BMS integrated module 1 to the greatest extent and the electrical contacts are connected with the minimum distance. If there is a relative displacement between the two electrical contacts, they are connected through the current-carrying copper bus and the floating terminal 14 on the BMS integrated module 1, and finally a technical solution of a fully integrated BDMU with a floating connection is realized.

[0056] The lower shell assembly 32 and the upper cover assembly 33 respectively have assembly space, and the BMS integrated module 1 is fixed to the upper cover assembly 33 by bolts. The upper cover assembly 33 is designed with installation positions and assembly gaps corresponding to the main positive relay 7, the main negative relay 11, the main fuse 8, the pre-charging resistor 10, the pre-charging relay 9, the heating fuse 35, the heating relay 34 and the shunt 12. The assembly space and gap for electrical parts are reserved in the lower shell assembly 32, and the lower shell assembly 32 is buckled with the card slot of the upper cover assembly 33 through a snap-fit ​​structure. The lower shell assembly 32 is provided with an elastic snap-fit ​​structure, which has the characteristics of tight fixation and stability.

[0057] The upper cover assembly 33 is provided with a first functional hole for each electrical component installed on the BMS integrated module 1 to pass through, such as the first functional hole for the pre-charging relay 9, the heating relay 34, the pre-charging resistor 10, and the heating fuse 35 to pass through. The upper cover assembly 33 is provided with a second functional hole for the lead-out conductor 25 of the main positive relay 7 and the main negative relay 11, as well as the low-voltage control pin of the main positive relay 7, the low-voltage control pin of the main negative relay 11, the shunt 12, and the high-voltage collection pin to pass through, which is used for the lead-out conductor 25 to connect to the floating terminal 14 on the BMS integrated module 1, and the PIN pin of the shunt 12 will pass through the through hole of the upper cover assembly 33 and be connected to the corresponding floating terminal 14 on the BMS integrated module 1.

[0058] One end of the second current-carrying copper bus 17 and the third current-carrying copper bus 18 are led out to the outside of the upper cover assembly 33 and fixed on the upper cover assembly 33. A protective cover 36 is provided on the outside of the upper cover assembly 33 to cover the second current-carrying copper bus 17 and the third current-carrying copper bus 18 to prevent hand touch.

[0059] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A fully integrated BDMU with floating connection, characterized in that: It comprises a BMS integrated module, the BMS integrated module is provided with a substrate, the substrate is integrated with a positive circuit, a negative circuit, a pre-charging circuit, multiple control circuits and a signal acquisition circuit, the positive circuit is provided with a main positive relay and a main fuse, the pre-charging circuit is connected in parallel with the main positive relay, the pre-charging circuit is provided with a pre-charging relay and a pre-charging resistor, the pre-charging relay and the pre-charging resistor are integrated on the substrate, the negative circuit is provided with a main negative relay and a shunt, the BMS integrated module controls the main positive relay, the main negative relay, the pre-charging relay and the shunt respectively through multiple control circuits, and the BMS integrated module collects electrical signals of the main positive relay and the main negative relay respectively through a signal acquisition circuit; The main positive relay, the main fuse, the main negative relay and the shunt are electrically connected via a copper busbar; The substrate is provided with floating terminals connected to the pins of the electrical device or the copper busbar.

2. A fully integrated BDMU with floating connection according to claim 1, characterized in that: The positive electrode of the main fuse is connected to the positive current-carrying copper bar, the negative electrode of the main fuse is connected to the high-voltage positive electrode of the main positive relay through the first current-carrying copper bar, and the high-voltage negative electrode of the main positive relay is connected to the second current-carrying copper bar; The high-voltage positive electrode of the main negative relay is connected to the third current-carrying copper busbar, and the high-voltage negative electrode of the main negative relay is connected to the shunt through the fourth current-carrying copper busbar; The positive and negative low-voltage control pins of the main positive relay, the positive and negative low-voltage control pins of the main negative relay, the pins of the first current-carrying copper busbar, the pins of the second current-carrying copper busbar and the pins of the third current-carrying copper busbar are all connected to corresponding floating terminals on the substrate.

3. A fully integrated BDMU with floating connection according to claim 1 or 2, characterized in that: The floating terminal comprises a terminal support, on which at least one group of symmetrically arranged clamping springs are arranged, elastic clamping is formed between the symmetrically arranged clamping springs, and a welding pin is arranged at the bottom of the terminal support.

4. A fully integrated BDMU with floating connection according to claim 3, characterized in that: The clamping region of the clamping spring is provided with at least one bend.

5. A fully integrated BDMU with floating connection according to claim 3, characterized in that: An elastic bend is provided between the terminal bracket and the welding pin.

6. A fully integrated BDMU with floating connection according to claim 1, characterized in that: A heating circuit is integrated on the substrate, and a heating relay and a heating fuse are arranged on the heating circuit.

7. A fully integrated BDMU with floating connection according to claim 6, characterized in that: The heating relay and the heating fuse are integrated on a substrate.

8. A fully integrated BDMU with floating connection according to claim 1, characterized in that: The pre-charging relay and the pre-charging resistor are integrated on a substrate.

9. A fully integrated BDMU with floating connection according to claim 1, characterized in that: The BMS integrated module is fixed in an outer shell, which includes a lower shell assembly and an upper cover assembly. The lower shell assembly and the upper cover assembly are detachably connected, and an installation position and an assembly gap for the BMS integrated module are provided between the lower shell assembly and the upper cover assembly.

10. A fully integrated BDMU with floating connection according to claim 9, characterized in that: One end of the second current-carrying copper bar and the third current-carrying copper bar are led out to the outside of the upper cover assembly and fixed on the upper cover assembly. A protective cover covering the second current-carrying copper bar and the third current-carrying copper bar is provided on the outer side of the upper cover assembly.

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