Battery pack disconnection unit and battery pack

Abstract

The utility model relates to the technical field of battery packs, in particular to a battery pack disconnecting unit and a battery pack. The battery pack disconnecting unit comprises a first shell, a second shell positioned above the first shell and a third shell arranged between the first shell and the second shell; a first accommodating space is formed between the first shell and the third shell, and a second accommodating space is formed between the third shell and the second shell; wherein a conductive part, a plurality of relays, a first concentrator and a first wire harness are arranged in the first accommodating space, the plurality of relays are connected into a conductive path through the conductive part, and the first wire harness is connected with the conductive part and the first concentrator; a second wire harness and a second concentrator are arranged in the second containing space, the first end of the second wire harness penetrates through the third shell and is connected with the relays, and the second end of the second wire harness is connected with the second concentrator. By applying the technical scheme of the invention, the problems of low safety and large occupied space of the battery pack disconnecting unit in the related technology can be effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular, to a battery pack disconnect unit and a battery pack. Background Art

[0002] A battery pack disconnect unit (BDU, Battery Disconnect Unit) is an innovative battery management system design aimed at achieving efficient thermal management and noise control through liquid cooling technology and a layered structure.

[0003] The battery pack disconnect unit in the related art generally includes a base and an upper cover. There is an accommodation space between the base and the upper cover, and electronic components such as relays, wire harnesses, and acquisition terminals are all arranged in the accommodation space.

[0004] However, the layout in the accommodation space of this setting method is not reasonable enough, the wire harness routing is messy, which reduces the safety of the battery pack disconnect unit. In addition, multiple electronic components are laid in the base, occupying a relatively large space. Summary of the Utility Model

[0005] The present application provides a battery pack disconnect unit and a battery pack to solve the problems of low safety and large space occupation of the battery pack disconnect unit in the related art.

[0006] On the one hand, the present application provides a battery pack disconnect unit, including: a first housing, a second housing located above the first housing, and a third housing disposed between the first housing and the second housing;

[0007] There is a first accommodation space between the first housing and the third housing, and a second accommodation space between the third housing and the second housing;

[0008] Wherein, a conductive member, a plurality of relays, a first hub, and a first wire harness are arranged in the first accommodation space. The conductive member connects the plurality of relays into a conductive path, and the first wire harness connects the conductive member and the first hub;

[0009] A second wire harness and a second hub are arranged in the second accommodation space. The first end of the second wire harness passes through the third housing and is respectively connected to the plurality of relays, and the second end of the second wire harness is connected to the second hub.

[0010] In some embodiments, the conductive member includes a plurality of connecting copper bars. Adjacent two relays are connected by one connecting copper bar, and the connecting copper bar is injection-molded and connected to the first housing.

[0011] In some embodiments, the connecting copper bar includes a conductive sheet and a stud disposed on the conductive sheet. The conductive sheet is injection-molded and connected to the first housing, and the stud is connected to the first wire harness.

[0012] In some embodiments, the first end of each connecting busbar is located within the first accommodation space, and the second end of each connecting busbar extends out of the first housing.

[0013] In some embodiments, a wire groove is formed on the surface of the third housing facing the second housing, and the second wire harness is disposed within the wire groove.

[0014] In some embodiments, the multiple relays include a main positive relay, a fast charge positive relay, a main negative relay, and a fast charge negative relay.

[0015] In some embodiments, the battery pack disconnect unit further includes a shunt and an excitation fuse, and the conductive member connects the multiple relays, the shunt, and the excitation fuse into an electrically conductive path.

[0016] In some embodiments, the battery pack disconnect unit further includes a fastening structure, and the first housing, the second housing, and the third housing are detachably connected through the fastening structure.

[0017] In some embodiments, the fastening structure includes a first fastener and a second fastener. The first fastener passes through the first housing and the third housing, and the second fastener passes through the second housing and the third housing.

[0018] On the other hand, the present application provides a battery pack, including: a battery pack disconnect unit, an insulating and heat-conducting member, and a liquid cooling plate;

[0019] wherein, the battery pack disconnect unit is the above-mentioned battery pack disconnect unit;

[0020] The insulating and heat-conducting member is disposed between the conductive member of the battery pack disconnect unit and the liquid cooling plate, and the insulating and heat-conducting member is in contact and cooperation with the conductive member and the liquid cooling plate respectively.

[0021] The battery pack disconnect unit provided by this application includes a first housing, a second housing, and a third housing. The third housing can separate the space between the first housing and the second housing, forming a first accommodation space between the first housing and the third housing, and a second accommodation space between the third housing and the second housing. A conductive member, a plurality of relays, a first hub, and a first wire harness are arranged in the first accommodation space. The conductive member connects the plurality of relays into a conductive path, and the first wire harness can connect the conductive member and the first hub, thereby forming a connection path between the plurality of relays and the first hub. A second wire harness and a second hub are arranged in the second accommodation space. The first end of the second wire harness passes through the third housing and is respectively connected to the plurality of relays, and the second end of the second wire harness is connected to the second hub, thereby realizing the connection path between the plurality of relays and the second hub. This setting method can make full use of the longitudinal space in the housing, divide the housing into a plurality of longitudinally arranged accommodation spaces, thereby realizing the hierarchical placement of electronic components, optimizing the placement layout of electronic components, and at the same time realizing hierarchical wire management, avoiding the scattering of the wiring in the battery pack disconnect unit, and ensuring the service life of the battery pack disconnect unit. In addition, the hierarchical placement of electronic components can also reduce the space occupied by the battery pack disconnect unit in the horizontal direction, making the structure of the battery pack more compact. Brief Description of the Drawings

[0022] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0023] Figure 1 It is a schematic exploded view of the battery pack disconnect unit provided by the embodiment of this application;

[0024] Figure 2 It is a schematic structural view of the first housing of the battery pack disconnect unit provided by the embodiment of this application;

[0025] Figure 3 It is a combined schematic view of the first housing and the third housing of the battery pack disconnect unit provided by the embodiment of this application.

[0026] Description of the Reference Numerals:

[0027] 10. Battery pack disconnect unit;

[0028] 110. First housing; 120. Second housing; 130. Third housing; 131. Wire groove;

[0029] 200. Connection copper bar; 210. Conductive sheet; 220. Stud;

[0030] 300. First hub;

[0031] 400. First wire harness;

[0032] 500. The second wire harness;

[0033] 600. The second hub;

[0034] 700. The main positive relay;

[0035] 800. The fast charging positive relay. Specific embodiments

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the protection scope of this application.

[0037] The battery disconnect unit (BDU) is a device designed specifically for the interior of the battery pack, and it is also a type of high-voltage distribution box. The main function of the BDU is to coordinate the function conversion and energy distribution of high-voltage accessories such as the drive motor control system, battery management system, charging management system, DC / DC, electric air conditioner, electric power steering, and braking system. In addition, the BDU can also achieve safety protection functions such as rapid power-off protection for short circuits and overloads, and anti-electric leakage protection, ensuring simpler vehicle maintenance, more convenient installation, helping to extend the battery life, and reducing daily maintenance costs.

[0038] The design of the BDU usually includes components such as the system main circuit contactor, pre-charge relay, and current sensor. These components work together to protect the battery pack and ensure the safe operation of the power system. When an error occurs in the system, the battery system will cut off the current through the main contactor according to the command of the vehicle controller to ensure system safety.

[0039] Generally, the BDU is composed of a base and an upper cover. The two together enclose an internal accommodation space for arranging core electronic components such as relays, wire harnesses, and acquisition terminals. However, the traditional BDU design has certain limitations: the layout of the accommodation space is not fully optimized, resulting in a messy wire harness arrangement, which to a certain extent affects the overall safety of the system; at the same time, the dense distribution of numerous electronic components inside the base not only occupies a large amount of valuable space resources but may also have an adverse impact on the heat dissipation performance.

[0040] In view of this, the present application provides a battery pack disconnect unit and a battery pack. Among them, the battery pack disconnect unit is arranged in layers. This arrangement can make full use of the longitudinal space, place electronic components in layers, and also arrange high-voltage and low-voltage wiring harnesses in layers. On the one hand, it reduces the space occupied by the battery pack disconnect unit in the horizontal direction, and at the same time is conducive to improving the safety of the battery pack disconnect unit.

[0041] The following describes the battery pack disconnect unit and the battery pack provided by the embodiments of the present application with reference to the accompanying drawings. It should be noted that the battery pack provided by the embodiments of the present application can be charged, discharged and recycled. The specific type of the battery pack can include, but is not limited to, a lithium battery pack. The scenarios in which the battery pack can be used include energy storage devices, transportation tools, etc., such as new energy vehicles, drones, etc. The embodiments of the present application do not make specific limitations on this.

[0042] Figure 1 It is a schematic exploded view of the battery pack disconnect unit provided by the embodiment of the present application; Figure 2 It is a schematic structural view of the first housing of the battery pack disconnect unit provided by the embodiment of the present application; Figure 3 It is a combined schematic view of the first housing and the third housing of the battery pack disconnect unit provided by the embodiment of the present application.

[0043] As Figures 1 to 3 shown, the embodiment of the battery pack disconnect unit 10 provided in this embodiment includes: a first housing 110, a second housing 120, a third housing 130, a conductive member, a relay, a hub, and a wiring harness.

[0044] Among them, the second housing 120 is located above the first housing 110, and the third housing 130 is arranged between the first housing 110 and the second housing 120.

[0045] There is a first accommodation space between the first housing 110 and the third housing 130, and a second accommodation space between the third housing 130 and the second housing 120.

[0046] Among them, a conductive member, a plurality of relays, a first hub 300, and a first wiring harness 400 are arranged in the first accommodation space. The conductive member connects the plurality of relays into a conductive path, and the first wiring harness 400 connects the conductive member and the first hub 300.

[0047] A second wiring harness 500 and a second hub 600 are arranged in the second accommodation space. The first end of the second wiring harness 500 passes through the third housing 130 and is respectively connected to the plurality of relays, and the second end of the second wiring harness 500 is connected to the second hub 600.

[0048] Applying the technical solution of this embodiment, the battery pack disconnect unit 10 includes a first housing 110, a second housing 120, and a third housing 130. The third housing 130 can separate the space between the first housing 110 and the second housing 120, so that a first accommodation space is formed between the first housing 110 and the third housing 130, and a second accommodation space is formed between the third housing 130 and the second housing 120. A conductive member, a plurality of relays, a first hub 300, and a first wire harness 400 are arranged in the first accommodation space. The conductive member connects the plurality of relays into a conductive path, and the first wire harness 400 can connect the conductive member and the first hub 300, thereby forming a connection path between the plurality of relays and the first hub 300.

[0049] A second wire harness 500 and a second hub 600 are arranged in the second accommodation space. The first end of the second wire harness 500 passes through the third housing 130 and is respectively connected to the plurality of relays, and the second end of the second wire harness 500 is connected to the second hub 600, thereby realizing a connection path between the plurality of relays and the second hub 600.

[0050] This setting method can make full use of the longitudinal space in the housing, divide the housing into a plurality of longitudinally arranged accommodation spaces, thereby realizing the hierarchical placement of electronic components, optimizing the placement layout of electronic components, and at the same time realizing hierarchical wire management, avoiding the scattering of the wiring in the battery pack disconnect unit 10, and ensuring the service life of the battery pack disconnect unit 10. In addition, the hierarchical placement of electronic components can also reduce the space occupied by the battery pack disconnect unit 10 in the horizontal direction, making the structure of the battery pack more compact.

[0051] It should also be noted that the first wire harness 400 is a high-voltage wire harness, and the second wire harness 500 is a low-voltage wire harness. The hierarchical setting of the high-voltage wire harness and the low-voltage wire harness can further improve the safety of the battery pack disconnect unit 10.

[0052] In the battery pack disconnect unit (BDU), the design of the conductive members is crucial because they directly affect the current transmission efficiency and the stability of the system.

[0053] To ensure the connection stability of the conductive members, as Figure 1 and Figure 2 shown, in some embodiments, the conductive member includes a plurality of connecting copper bars 200. Adjacent two relays are connected by a connecting copper bar 200, and the connecting copper bar 200 is injection-molded and connected to the first housing 110.

[0054] In the above structure, copper is an excellent conductive material with the characteristics of low resistance and high conductivity. Therefore, using copper bars as connectors can effectively reduce the energy loss during current transmission and improve the transmission efficiency of electric energy.

[0055] It should also be noted that by injection-molding the connection busbar 200 to the first housing 110, the structural strength and stability of the entire BDU can be enhanced. The injection-molding connection can ensure the fixed position of the busbar under mechanical stress and thermal stress, reducing the risk of loosening or breaking due to vibration or temperature changes. At the same time, the injection-molded connection busbar is stably fixed within the first housing 110, eliminating the step of assembling the connection busbar 200 to the first housing 110, effectively improving the assembly efficiency of the battery pack disconnect unit 10.

[0056] In addition, two adjacent relays are connected by a single connection busbar. This design simplifies the wiring and assembly process inside the BDU. The number of connection points is reduced, which helps to lower the assembly difficulty and improve the production efficiency.

[0057] Specifically, as Figure 2 shown, in some embodiments, the connection busbar 200 includes a conductive sheet 210 and studs 220 provided on the conductive sheet 210. The conductive sheet 210 is injection-molded to the first housing 110, and the studs 220 are connected to the first wire harness 400. The studs 220 help to achieve the connection of the first wire harness 400. Specifically, a connection ring can be provided at the end of the first wire harness, and the connection ring is sleeved on the stud 220 and then tightened with a nut.

[0058] Furthermore, in some embodiments, the first end of each connection busbar 200 is located within the first accommodation space, and the second end of each connection busbar 200 extends out of the first housing 110. Such an arrangement enables the connection busbar 200 to extend out of the bottom surface of the first housing 110, facilitating the contact between the connection busbar 200 and the liquid cooling plate. Since the connection busbar 200 has good thermal conductivity, it helps to achieve the heat dissipation effect of the battery pack disconnect unit 10.

[0059] Furthermore, as Figure 3 shown, in some embodiments, a wire groove 131 is formed on the surface of the third housing 130 facing the second housing 120, and the second wire harness 500 is disposed within the wire groove 131. The wire groove 131 can accommodate the second wire harness 500, thereby reducing the probability of the second wire harness 500 moving around within the second accommodation space, which helps to ensure the service life of the battery pack disconnect unit 10.

[0060] It should be noted that the multiple relays include a main positive relay 700, a fast charge positive relay 800, a main negative relay, and a fast charge negative relay.

[0061] Specifically, the main positive relay 700 is mainly responsible for controlling the charging process of the battery pack. During charging, it conducts the current from the charger into the battery pack, and at the same time, during discharging, it outputs the electrical energy of the battery pack to loads such as the vehicle motor. In addition, the main positive relay 700 also has the function of protecting the battery pack. When the voltage of the battery pack is too high or too low, the main positive relay will automatically disconnect the circuit to avoid overcharging or over-discharging of the battery pack, thereby extending the service life of the battery pack.

[0062] The specific function of the fast charging positive relay 800 may be similar to that of other relays, but it is specifically used to handle the current control during the fast charging process. In the fast charging mode, this relay may close or disconnect more quickly to rapidly adjust the charging state of the battery pack while maintaining the safety of the system.

[0063] The functions of the main negative relay and the fast charging negative relay are similar to those of the main positive relay and the fast charging positive relay, respectively, and are responsible for controlling the grounding of the negative electrode of the battery pack. When the battery pack needs to stop outputting electrical energy, the main negative relay will cut off the grounding of the negative electrode of the battery pack from the vehicle body, thereby preventing the electrical energy of the battery pack from short-circuiting through the vehicle body and causing safety accidents. At the same time, the main negative relay can also cut off the circuit between the battery pack and the motor when the vehicle is turned off or powered off to avoid waste or damage of the electrical energy of the battery pack.

[0064] In some embodiments, the battery pack disconnecting unit 10 further includes a shunt and an excitation fuse, and the conductive member connects multiple relays, the shunt, and the excitation fuse into a conductive path.

[0065] The main function of the shunt in the battery pack disconnecting unit 10 is to distribute current. It is usually used in cooperation with the relay to switch the current between different circuit paths to achieve precise control of each unit inside the battery pack. The shunt can ensure that the current flows along the predetermined path, thereby protecting the battery pack from overload or short-circuit damage.

[0066] The function of the excitation fuse in the battery pack disconnecting unit 10 is to provide circuit protection. When a short circuit or overload occurs in the circuit, the excitation fuse can quickly and effectively cut off the current to prevent further damage. It melts or vaporizes the fuse wire through the thermal effect to generate a break, and an arc is generated at the break. The fuse cuts off the faulty circuit by extinguishing the arc.

[0067] It should also be noted that in some embodiments, the battery pack disconnecting unit 10 further includes a fastening structure, and the first housing 110, the second housing 120, and the third housing 130 are detachably connected through the fastening structure, and the fastening structure can ensure the stability of the connection between the first housing 110, the second housing 120, and the third housing 130.

[0068] Specifically, in some embodiments, the fastening structure includes a first fastener and a second fastener. The first fastener passes through the first housing 110 and the third housing 130, and the second fastener passes through the second housing 120 and the third housing 130.

[0069] Exemplarily, the first fastener may be a fastening screw to achieve a stable connection between the first housing 110 and the third housing 130. The second fastener may also be a screw to achieve a stable connection between the second housing 120 and the third housing 130.

[0070] On the other hand, an embodiment of the present application further provides a battery pack, including: a battery pack disconnect unit 10, an insulating and heat-conducting member, and a liquid cooling plate.

[0071] Wherein, the battery pack disconnect unit 10 is the above-mentioned battery pack disconnect unit 10; the insulating and heat-conducting member is disposed between the conductive member of the battery pack disconnect unit 10 and the liquid cooling plate, and the insulating and heat-conducting member is in contact and cooperation with the conductive member and the liquid cooling plate respectively.

[0072] In the above structure, the liquid cooling plate is disposed inside the battery pack, and can achieve a cooling effect on the battery module and the battery pack disconnect unit 10. Since the bottom surface of the battery pack disconnect unit 10 has an exposed connection copper busbar 200, direct contact between the connection copper busbar 200 and the liquid cooling plate will increase the safety risk of the battery pack disconnect unit 10. Therefore, isolating the two through the insulating and heat-conducting member can improve the safety of the battery pack disconnect unit 10 while ensuring the heat-conducting effect.

[0073] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0074] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0075] The terms "first", "second", "third", "fourth", etc. (if any) in the description, claims and the above-mentioned drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein, for example.

[0076] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack disconnecting unit, characterized in that, Comprising: A first housing, a second housing located above the first housing, and a third housing disposed between the first housing and the second housing; There is a first accommodation space between the first housing and the third housing, and a second accommodation space between the third housing and the second housing; Wherein, a conductive member, a plurality of relays, a first hub, and a first wire harness are arranged in the first accommodation space, the conductive member connects the plurality of relays into a conductive path, and the first wire harness connects the conductive member and the first hub; A second wire harness and a second hub are arranged in the second accommodation space, a first end of the second wire harness passes through the third housing and is respectively connected to the plurality of relays, and a second end of the second wire harness is connected to the second hub.

2. The battery pack disconnecting unit according to claim 1, wherein The conductive member includes a plurality of connecting copper bars, and adjacent two of the relays are connected by one connecting copper bar, and the connecting copper bar is injection-molded and connected to the first housing.

3. The battery pack disconnecting unit according to claim 2, wherein, The connecting copper bar includes a conductive sheet and a stud disposed on the conductive sheet, the conductive sheet is injection-molded and connected to the first housing, and the stud is connected to the first wire harness.

4. The battery pack disconnecting unit according to claim 3, characterized in that, A first end of each connecting copper bar is located in the first accommodation space, and a second end of each connecting copper bar passes out of the first housing.

5. The battery pack disconnecting unit according to claim 1, characterized in that, A wire groove is formed on a surface of the third housing facing the second housing, and the second wire harness is disposed in the wire groove.

6. The battery pack disconnecting unit according to any one of claims 2 to 4, characterized in that The plurality of relays include a main positive relay, a fast charge positive relay, a main negative relay, and a fast charge negative relay.

7. The battery pack disconnecting unit according to any one of claims 2 to 4, characterized in that, The battery pack disconnecting unit further includes a shunt and an excitation fuse, and the conductive member connects the plurality of relays, the shunt, and the excitation fuse into a conductive path.

8. The battery pack disconnecting unit according to any one of claims 1 to 5, characterized in that The battery pack disconnecting unit further includes a fastening structure, and the first housing, the second housing, and the third housing are detachably connected through the fastening structure.

9. The battery pack disconnecting unit according to claim 8, wherein The fastening structure includes a first fastener and a second fastener, the first fastener passes through the first housing and the third housing, and the second fastener passes through the second housing and the third housing.

10. A battery pack, characterized in that, Comprising: A battery pack disconnecting unit, an insulating and heat-conducting member, and a liquid cooling plate; Wherein, the battery pack disconnecting unit is the battery pack disconnecting unit according to any one of claims 1 to 9; The insulating and heat-conducting member is disposed between the conductive member of the battery pack disconnecting unit and the liquid cooling plate, and the insulating and heat-conducting member is in contact and cooperation with the conductive member and the liquid cooling plate respectively.

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