Battery device and electric device

Abstract

The embodiment of the present application provides a battery device and a power utilization device. The battery device comprises battery monomers, a busbar and a main circuit board. The busbar is used for electrically connecting electrode terminals of at least two battery monomers. The main circuit board comprises an output end and a plurality of wire harnesses arranged side by side. The plurality of wire harnesses are used for being connected to a plurality of sampling points. The plurality of sampling points comprise temperature sampling points. The wire harnesses comprise temperature sampling wire harnesses. The battery device further comprises a temperature acquisition assembly arranged at the temperature sampling points. The temperature acquisition assembly comprises a mounting bracket and a temperature detection component. The temperature detection component is arranged on the mounting bracket. The temperature sampling wire harnesses are electrically connected to the temperature detection component. The temperature acquisition assembly further comprises an auxiliary circuit board. The auxiliary circuit board is connected to one side of the mounting bracket and is respectively welded with the temperature detection component and a first wire harness segment of the temperature sampling wire harnesses, so as to indirectly electrically connect the temperature detection component and the temperature sampling wire harnesses. The technical scheme provided by the present application can improve the reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery device and an electrical device. Background Technology

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery device technology, in addition to improving the performance of battery devices, reliability is also a crucial consideration. Therefore, improving the reliability of battery devices is a continuous challenge in battery device technology. Utility Model Content

[0004] This application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide a battery device, which includes multiple battery cells, multiple busbars, and a main circuit board. The busbars are used to electrically connect the electrode terminals of at least two battery cells. Sampling points are provided on each of the multiple busbars and / or multiple battery cells. The main circuit board includes an output terminal and multiple parallel wire harnesses. The multiple wire harnesses are used to connect to the multiple sampling points. Each wire harness includes a conductor and an insulating shell, with the insulating shell covering the outside of the conductor. Each wire harness includes a first wire harness segment and a second wire harness segment interconnected in its extending direction. The first wire harness segment connects to the sampling points, and the end of the second wire harness segment away from the first wire harness segment is used to connect to the output terminal. The first wire harness segment of any wire harness... The second wire harness segment is disconnected from the wire harness connected to other sampling points, and its insulating shell is connected to the insulating shell of the wire harness connected to other sampling points. Multiple sampling points include temperature sampling points, and the wire harness includes a temperature sampling wire harness. The battery device also includes a temperature acquisition component located at the temperature sampling point. The temperature acquisition component includes a mounting bracket and a temperature detection component. The temperature detection component is mounted on the mounting bracket, and the temperature sampling wire harness is electrically connected to the temperature detection component. The temperature acquisition component also includes an auxiliary circuit board connected to one side of the mounting bracket and soldered to both the temperature detection component and the first wire harness segment of the temperature sampling wire harness, thereby indirectly connecting the temperature detection component and the temperature sampling wire harness.

[0007] In the technical solution of this application embodiment, the temperature acquisition component also includes an auxiliary circuit board. The auxiliary circuit board integrates the two wires of the traditional temperature detection component into one unit, thus improving the compactness and integration of the temperature acquisition component. Furthermore, the auxiliary circuit board is connected to one side of the mounting bracket and solders the temperature detection component and the first segment of the temperature sampling harness to it. Compared to the traditional method of soldering two wires from the temperature acquisition component to the main circuit board using a line-to-line connection, the connection surface changes from a traditional line-to-line connection to a line-to-surface connection. This results in a larger contact area, easier positioning, and easier control of soldering quality, improving the connection reliability between the temperature acquisition component and the temperature sampling harness, thereby improving the reliability of the battery device.

[0008] According to some embodiments of this application, the battery device further includes a voltage sampling element electrically connected to a busbar, a plurality of sampling points including voltage sampling points located on the voltage sampling element; and a wiring harness including a voltage sampling wiring harness, a first segment of the voltage sampling wiring harness being welded to the voltage sampling element, and a second segment of the voltage sampling wiring harness being electrically connected to an output terminal.

[0009] In the above scheme, the voltage sampling point is located on the voltage sampling component. The first section of the voltage sampling harness is welded to the voltage sampling component. The connection method between the voltage sampling harness and the voltage sampling component is the same as the connection method between the temperature sampling harness and the auxiliary circuit board. This can be carried out in the same welding process, which simplifies the assembly process and improves the assembly efficiency of the battery device.

[0010] According to some embodiments of this application, an auxiliary circuit board is connected to the side of the mounting bracket facing the battery cell; a temperature sampling harness is connected to the side of the auxiliary circuit board facing the battery cell, and a voltage sampling harness is connected to the side of the voltage sampling device facing the battery cell.

[0011] In the above solution, the auxiliary circuit board is connected to the side of the mounting bracket facing the battery cell, the temperature sampling harness is connected to the side of the auxiliary circuit board facing the battery cell, and the voltage sampling harness is connected to the side of the voltage sampling device facing the battery cell. That is, both the temperature sampling harness and the voltage sampling harness are located on the side facing the battery cell, which makes it easier to weld the temperature sampling harness to the auxiliary circuit board and the voltage sampling device in the same process, thus optimizing the assembly process of the temperature sampling harness to the auxiliary circuit board and the voltage sampling harness to the voltage sampling device.

[0012] According to some embodiments of this application, the battery device further includes a carrier, which is disposed on the side of the main circuit board facing the battery cell. The busbar and the temperature acquisition component are both located on the side of the carrier facing the main circuit board. The surface of the side of the carrier facing the main circuit board has an adhesive layer. At least a portion of the temperature sampling harness and the temperature acquisition component are bonded to the carrier through the adhesive layer to fix the relative positions of the temperature sampling harness and the temperature acquisition component on the carrier. At least a portion of the voltage sampling harness and the busbar are bonded to the carrier through the adhesive layer to fix the relative positions of the voltage sampling harness and the busbar on the carrier.

[0013] In the above solution, the surface of the carrier facing the main circuit board has an adhesive layer. When the temperature sampling harness is soldered to the auxiliary circuit board and the voltage sampling harness is soldered to the voltage sampling device, the adhesive layer can play a role in pre-positioning the temperature sampling harness and the voltage sampling harness. The position of the temperature sampling harness and the voltage sampling harness is not easily displaced, which reduces the soldering difficulty of the temperature sampling harness to the auxiliary circuit board and the voltage sampling harness to the voltage sampling device, and improves the soldering effect and soldering efficiency.

[0014] According to some embodiments of this application, the carrier is a thin film made of insulating material, and the thickness of the film is 0.1mm-0.5mm.

[0015] In the above solution, by using a thin film made of insulating material as the carrier, the carrier can provide insulation between the battery cells and the busbar, as well as between the battery cells and the main circuit board, reducing the risk of short circuits between the busbar, the main circuit board, and the battery cells, and improving the safety of the battery device. Furthermore, the thickness of the film is controlled at 0.1mm-0.5mm, which meets the load-bearing strength requirements of the busbar and the main circuit board without excessively occupying internal space in the battery device.

[0016] According to some embodiments of this application, the voltage sampling harness is connected to the voltage sampling element by soldering, and the temperature sampling harness is connected to the auxiliary circuit board by soldering.

[0017] In the above scheme, the voltage sampling harness is connected to the voltage sampling component by soldering, and the temperature sampling harness is connected to the auxiliary circuit board by soldering. The process is simple, the cost is low, and the conductivity stability is high.

[0018] According to some embodiments of this application, the busbar has a notch, and the outer periphery of the mounting bracket has a slot that engages with the periphery of the notch.

[0019] In the above solution, a notch is provided on the busbar, and a slot is provided on the outer periphery of the mounting bracket. The mounting bracket is inserted into the opening of the notch, and the periphery of the notch provides support and limiting function for the mounting bracket. The mounting bracket can be installed on the busbar relatively quickly and stably, and the slot on the outer periphery of the mounting bracket engages with the periphery of the notch. The mounting bracket is easy and quick to install on the busbar, and the installation reliability of the temperature acquisition component is high.

[0020] According to some embodiments of this application, the auxiliary circuit board includes a conductive layer, a first insulating layer and a second insulating layer stacked together. The first insulating layer is disposed on the side of the conductive layer facing away from the mounting bracket, and the second insulating layer is disposed on the side of the conductive layer facing the mounting bracket. The first insulating layer has a first opening, and the conductive layer includes a first exposed area exposed through the first opening. The temperature sampling harness is soldered to the first exposed area.

[0021] In the above scheme, the auxiliary circuit board includes a conductive layer, a first insulating layer and a second insulating layer stacked together. By providing a first opening on the first insulating layer, a first exposed area can be formed on the conductive layer. In this way, the auxiliary circuit board can be directly soldered to the temperature sampling harness through the first exposed area on the conductive layer, thereby realizing the electrical connection between the temperature sampling harness and the auxiliary circuit board. The connection between the temperature sampling harness and the auxiliary circuit board has high reliability and is convenient and quick.

[0022] According to some embodiments of this application, there are two first exposed areas, which are spaced apart. The temperature sampling harness includes two sub-temperature sampling harnesses, and the two sub-temperature sampling harnesses are respectively welded to the two first exposed areas.

[0023] In the above scheme, two first exposed areas are set, and two sub-temperature sampling wire bundles are welded to the two first exposed areas respectively to achieve a closed loop for the temperature detection signal transmission. The two first exposed areas are set apart, that is, the two sub-temperature sampling wire bundles are set apart from each other, which reduces the risk of interference or short circuit between the two sub-temperature sampling wire bundles and improves the stability of temperature signal transmission.

[0024] According to some embodiments of this application, the temperature acquisition component further includes a thermal pad, which is disposed between the auxiliary circuit board and the battery cell. The temperature detection component is thermally connected to the battery cell through the thermal pad. On the same projection plane perpendicular to the first direction, the orthographic projection of the thermal pad is located between the orthographic projections of the two first exposed areas, and the first direction is the thickness direction of the auxiliary circuit board.

[0025] In the above scheme, by setting a thermal pad on the auxiliary circuit board, the temperature acquisition component is thermally connected to the battery cell through the thermal pad. The temperature detection component can collect the temperature of the battery cell through the thermal pad, reducing heat loss and improving the accuracy of the temperature acquisition component in collecting the battery cell temperature. Since the orthographic projection of the thermal pad lies between the orthographic projections of the two first exposed areas, that is, after the temperature sampling harness is soldered to the first exposed area, the thermal pad is located in the area between the two sub-temperature sampling harnesses. The thermal pad will not interfere with the sub-temperature sampling harnesses, which is beneficial for the spatial layout of the sub-temperature sampling harnesses on the auxiliary circuit board. Furthermore, because the thermal pad and the sub-temperature sampling harnesses are spaced apart, the thermal radiation generated by the heat transferred by the thermal pad is less likely to affect the sub-temperature sampling harnesses, which helps to ensure the stability of the signal transmission of the sub-temperature sampling harnesses.

[0026] According to some embodiments of this application, the second insulating layer is provided with a second opening, the conductive layer includes a second exposed area exposed through the second opening, and the temperature sensing component is welded to the second exposed area.

[0027] In the above scheme, by providing a second opening on the second insulating layer, a second exposed area can be formed on the conductive layer. In this way, the auxiliary circuit board can be electrically connected to the temperature detection component through the second exposed area on the conductive layer. The temperature signal detected by the temperature detection component is transmitted through the auxiliary circuit board and the temperature sampling harness. The connection between the auxiliary circuit board and the temperature detection component is convenient and quick.

[0028] According to some embodiments of this application, the auxiliary circuit board is a flexible circuit board.

[0029] In the above solution, a flexible circuit board is used as the auxiliary circuit board. Flexible circuit boards have advantages such as flexibility, thinness, light weight, and high signal transmission stability, which facilitates the internal spatial layout of the temperature acquisition component and reduces its structural size. Furthermore, compared to a rigid circuit board, the flexible auxiliary circuit board can be connected to the mounting bracket using adhesive or other methods, making the assembly of the temperature acquisition component more convenient and faster.

[0030] According to some embodiments of this application, the voltage sampling device includes a stacked aluminum layer and a copper layer, the aluminum layer being electrically connected to a busbar, and the copper layer being soldered to a voltage sampling harness.

[0031] In the above scheme, the voltage sampling component adopts a composite structure of aluminum and copper layers. The voltage sampling component is welded to the busbar through the aluminum layer, which allows the busbar to be made of aluminum, and the welding effect of the aluminum layer with the busbar of the same material is better. By welding the copper layer to the voltage sampling harness, the conductor inside the voltage sampling harness can be made of copper, which also results in a better welding effect of the copper layer with the voltage sampling harness of the same material.

[0032] Secondly, embodiments of this application also provide an electrical device, which includes the battery device of any of the foregoing embodiments, and the electrical device is used to provide electrical energy.

[0033] The power device provided in this application embodiment has the same technical effect as the battery device provided in any of the above embodiments, and will not be described again here.

[0034] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0037] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0038] Figure 3 An exploded schematic diagram of a single battery cell in a battery device provided in some embodiments of this application;

[0039] Figure 4 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0040] Figure 5 for Figure 4 Enlarged diagram of A in the middle;

[0041] Figure 6 This is a schematic diagram of the structure of a temperature acquisition component in a battery device provided in some embodiments of this application;

[0042] Figure 7 This is a schematic diagram of the temperature acquisition component in a battery device provided in some embodiments of this application from another angle.

[0043] Figure 8 A top view of the busbar and main circuit board in a battery device provided in some embodiments of this application;

[0044] Figure 9 for Figure 8 Enlarged diagram of B in the middle;

[0045] Figure 10 This is a schematic diagram of the structure of a temperature acquisition component mounted on a busbar in a battery device provided in some embodiments of this application.

[0046] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 10 - Housing; 11 - First Sub-Housing; 12 - Second Sub-Housing; 20 - Battery Cell; 21 - Housing; 211 - Shell; 212 - End Cap; 213 - First Wall; 22 - Electrode Assembly; 23 - Electrode Terminal; 24 - Battery Cell Group; 30 - Busbar; 40 - Temperature Acquisition Component; 41 - Mounting Bracket; 411 - Slot; 42 - Temperature Detection Component; 43 - Auxiliary Circuit Board; 431 - Conductive Layer; 432 - First Insulation Layer; 434 - First Exposed Area; 44 - Thermal Pad; 50 - Main Circuit Board; 51 - Temperature Sampling Harness; 52 - Voltage Sampling Harness; 53 - Harness; 531 - First Harness Segment; 532 - Second Harness Segment; 60 - Voltage Sampling Component; 70 - Carrier Component; X - First Direction. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0049] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0053] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via busbars.

[0054] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0055] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0056] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0057] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0058] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0059] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0060] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0061] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0062] A single battery cell typically includes an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0063] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0064] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0065] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, carbon electrodes, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0066] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.

[0067] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0068] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc.

[0069] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0070] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0071] In some embodiments, the diaphragm is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0072] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0073] In some embodiments, the membrane is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0074] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0075] In some implementations, the electrode assembly is a stacked structure.

[0076] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0077] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0078] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0079] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0080] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments of this application.

[0081] In battery technology, a sampling unit is typically installed within the battery device to collect and monitor operational information during use, thus providing insights into the battery's status. However, when sampling the temperature of individual battery cells, the temperature sensing component in the temperature acquisition assembly usually has two leads. These leads are electrically connected to the wiring harness on the main circuit board. However, this wire-to-wire connection between the temperature sensing component and the main circuit board wiring harness presents challenges in positioning and reliability, negatively impacting the welding quality of the wiring harness. Furthermore, the connection between the main circuit board wiring harness and the voltage sampling component is a wire-to-surface connection. The different welding positioning and alignment methods for temperature and voltage sampling hinder the improvement of battery assembly efficiency.

[0082] In view of this, to solve the problem of low reliability of battery devices, some embodiments of this application provide a battery device, which includes battery cells, busbars, and a main circuit board. The busbars are used to electrically connect the electrode terminals of at least two battery cells, and sampling points are provided on multiple busbars and / or multiple battery cells. The main circuit board includes an output terminal and multiple wire harnesses arranged side by side. The multiple wire harnesses are used to connect to multiple sampling points. Each wire harness includes a conductor and an insulating shell, with the insulating shell covering the outside of the conductor. Each wire harness includes a first wire harness segment and a second wire harness segment connected to each other in its extending direction. The first wire harness segment connects to the sampling points, and the end of the second wire harness segment away from the first wire harness segment is used to connect to the output terminal. Wherein, any wire... The first wire harness segment of the bundle is disconnected from the wire harnesses connected to other sampling points, and the insulating shell of the second wire harness segment of the bundle is connected to the insulating shell of the wire harnesses connected to other sampling points. Multiple sampling points include temperature sampling points, and the bundle includes a temperature sampling wire harness. The battery device also includes a temperature acquisition component located at the temperature sampling point. The temperature acquisition component includes a mounting bracket and a temperature detection component. The temperature detection component is mounted on the mounting bracket, and the temperature sampling wire harness is electrically connected to the temperature detection component. The temperature acquisition component also includes an auxiliary circuit board connected to one side of the mounting bracket and soldered to both the temperature detection component and the first wire harness segment of the temperature sampling wire harness, thereby indirectly connecting the temperature detection component and the temperature sampling wire harness.

[0083] The battery device provided in this application embodiment also includes an auxiliary circuit board in the temperature acquisition component. The auxiliary circuit board integrates the two wires of the traditional temperature detection component into one unit, thus improving the compactness and integration of the temperature acquisition component. Furthermore, the auxiliary circuit board is connected to one side of the mounting bracket and solders the temperature detection component and the first segment of the temperature sampling harness to it. Compared to the traditional method of soldering two wires from the temperature acquisition component to the main circuit board using a line-to-line connection, the connection surface changes from a traditional line-to-line connection to a line-to-surface connection. This results in a larger contact area, easier positioning, and easier control of soldering quality, improving the connection reliability between the temperature acquisition component and the temperature sampling harness, thereby improving the reliability of the battery device.

[0084] The battery device disclosed in this application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using the battery device disclosed in this application.

[0085] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0086] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0087] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0088] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0089] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one open end, while the first sub-housing 11 may be a plate-like structure, covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 jointly define the space. Alternatively, both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0091] In the battery device 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also be composed of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0092] The battery device 100 may also include other structures, such as a busbar for electrical connection between multiple battery cells 20.

[0093] Please refer to Figure 3 , Figure 3 This is an exploded view of the battery cell 20 provided in an embodiment of this application. The battery cell 20 includes a housing 21, an electrode assembly 22, and electrode terminals 23. The housing 21 includes a shell 211 and an end cap 212. The shell 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment. The end cap 212 has a first wall 213, and the electrode terminals 23 are disposed on the first wall 213.

[0094] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. The housing 211 can have various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The housing 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0095] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved reliability. Functional components such as electrode terminals 23 can be provided on end cap 212. Electrode terminals 23 can be used for electrical connection with electrode assembly 22 to output or input electrical energy to battery cell 20. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this.

[0096] Electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. The housing 211 may contain one or more electrode assemblies 22.

[0097] This application provides a battery device; please refer to... Figures 4 to 9 , Figure 4 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application; Figure 5 for Figure 4 Enlarged diagram of A in the middle; Figure 6 This is a schematic diagram of the structure of a temperature acquisition component in a battery device provided in some embodiments of this application; Figure 7 This is a schematic diagram of the temperature acquisition component in a battery device provided in some embodiments of this application from another angle. Figure 8 A top view of the busbar and main circuit board in a battery device provided in some embodiments of this application; Figure 9 for Figure 8 Enlarged schematic diagram of B; Battery device 100 includes battery cells 20, busbars 30, and main circuit board 50. Busbars 30 are used to electrically connect the electrode terminals 23 of at least two battery cells 20. Sampling points are provided on multiple busbars 30 and / or multiple battery cells 20. Main circuit board 50 includes an output terminal and multiple parallel wiring harnesses 53. Multiple wiring harnesses 53 are used to connect to multiple sampling points. Wiring harnesses 53 include conductors and insulating shells. The insulating shell covers the outside of the conductors. Wiring harnesses 53 include a first wiring harness segment 531 and a second wiring harness segment 532 that are connected to each other in their extending direction. The first wiring harness segment 531 is connected to the sampling point, and the end of the second wiring harness segment 532 away from the first wiring harness segment 531 is used to connect to the output terminal. Wherein, the first wiring harness segment 531 of any wiring harness 53 is connected to other sampling points. The wire harnesses 53 at the sampling points are disconnected from each other, and the insulating shell of the second wire harness segment 532 of the wire harness 53 is connected to the insulating shell of the wire harness 53 connected to other sampling points. The multiple sampling points include temperature sampling points. The wire harness 53 includes a temperature sampling wire harness 51. The battery device also includes a temperature acquisition component 40 located at the temperature sampling point. The temperature acquisition component 40 includes a mounting bracket 41 and a temperature detection component 42. The temperature detection component 42 is located on the mounting bracket 41, and the temperature sampling wire harness 51 is electrically connected to the temperature detection component 42. The temperature acquisition component 40 also includes an auxiliary circuit board 43. The auxiliary circuit board 43 is connected to one side of the mounting bracket 41 and the temperature detection component 42 and the first wire harness segment 531 of the temperature sampling wire harness 51 are soldered to it respectively, so as to indirectly connect the temperature detection component 42 and the temperature sampling wire harness 51.

[0098] The busbar 30 electrically connects the electrode terminals 23 of at least two battery cells 20, thus enabling series or parallel connection of different battery cells 20. Optionally, the busbar 30 can connect the electrode terminals 23 of two battery cells 20 with the same polarity to achieve parallel connection of the battery cells 20, or the busbar 30 can connect the electrode terminals 23 of two battery cells 20 with opposite polarities to achieve series connection of the battery cells 20.

[0099] Sampling points are provided on multiple busbars 30 and / or multiple battery cells 20. That is, the sampling points can be set on the busbars 30, the battery cells 20, or both the busbars 30 and the battery cells 20. In other words, the wiring harness 53 in the main circuit board 50 can be connected to the busbars 30, the battery cells 20, or both the busbars 30 and the battery cells 20, so as to enable the main circuit board 50 to collect and obtain the usage information of the battery device.

[0100] The wire harness 53 includes a conductor and an insulating shell. The insulating shell covers the outside of the conductor. That is, each wire harness 53 of the main circuit board 50 includes two parts: a conductor and an insulating shell. The insulating shell is an insulating part that covers the outside of the conductor, so as to achieve insulation isolation between the conductors of multiple wire harnesses 53 through the insulating shell.

[0101] The main circuit board 50 includes multiple wire harnesses 53 arranged side-by-side. Each wire harness 53 includes a first wire harness segment 531 and a second wire harness segment 532 interconnected in its extension direction. That is, each wire harness 53 is divided into two segments in its extension direction: a first wire harness segment 531 and a second wire harness segment 532. The first wire harness segment 531 is detached from the wire harnesses 53 connected to other sampling points. The second wire harness segment 532 is the portion of the wire harness 53 connected to the wire harnesses 53 connected to other sampling points. The portion of the wire harness 53 stripped from the main circuit board 50 is the first wire harness segment 531, while the portion of the wire harness 53 that is not stripped and remains connected to the insulating shell of the wire harnesses 53 connected to other sampling points is the second wire harness segment 532. The output terminal of the main circuit board 50 can be electrically connected to the battery management system.

[0102] The temperature acquisition component 40 refers to the acquisition component capable of acquiring temperature information of the battery cell 20. The temperature acquisition component 40 includes a mounting bracket 41, a temperature detection component 42, and an auxiliary circuit board 43. The mounting bracket 41 is the main support structure of the temperature acquisition component 40, and the mounting bracket 41 can be a support structure made of insulating material.

[0103] Temperature detection component 42 is disposed on mounting bracket 41, and is connected to and located within mounting bracket 41. Temperature detection component 42 refers to a temperature sensor capable of detecting the temperature of battery cell 20. Temperature detection component 42 can be an NTC (Negative Temperature Coefficient) thermistor, which is a type of sensor resistor whose resistance decreases as temperature increases.

[0104] Multiple battery cells 20 constitute a battery cell group 24. The temperature detection component 42 can make thermal contact with the top cover of the battery cell 20 to collect temperature information from the battery cell 20. An auxiliary circuit board 43 is connected to one side of the mounting bracket 41. This means the auxiliary circuit board 43 is a circuit board mounted on the mounting bracket 41 and connected to it. The auxiliary circuit board 43 can be positioned on the side of the mounting bracket 41 facing the battery cell group 24. The auxiliary circuit board 43 integrates the circuitry of the temperature detection component 42, and is electrically connected to the temperature detection component 42 through its internal wires. Here, the auxiliary circuit board 43 is part of the temperature acquisition component 40. The auxiliary circuit board 43 is connected to the mounting bracket 41 and integrates the two wires from a conventional temperature detection component. This method eliminates the need for the traditional wire-to-wire connection between the temperature sensor wires of the temperature acquisition component 40 and the main circuit board 50. The temperature sampling harness 51 is soldered to the auxiliary circuit board 43, providing a line-to-surface connection with better positioning, easier control of soldering quality, and higher connection stability.

[0105] The output of the main circuit board is used for electrical connection with the battery management system. The temperature sampling harness 51 is one of the multiple harnesses 53 in the main circuit board 50. The first harness segment 531 of the temperature sampling harness 51 is soldered to the auxiliary circuit board 43 to realize the electrical connection between the temperature sampling harness 51 in the main circuit board 50 and the auxiliary circuit board 43. In this way, the temperature information collected by the temperature detection component 42 can be transmitted to the battery management system through the temperature sampling harness 51 to realize the acquisition of temperature information of the battery cell 20.

[0106] In the technical solution of this application embodiment, the temperature acquisition component 40 also includes an auxiliary circuit board 43. The auxiliary circuit board 43 integrates the two wires of the traditional temperature detection component 42 into one unit, thus making the temperature acquisition component 40 more compact and integrated. Furthermore, the auxiliary circuit board 43 is connected to one side of the mounting bracket 41 and welds the temperature detection component 42 and the first wire harness segment 531 of the temperature sampling harness 51 to it. Compared to the traditional method of connecting the two wires of the temperature acquisition component 40 to the main circuit board 50's wire harness 53 using a line-to-line connection, the connection surface changes from a traditional line-to-line connection to a line-to-surface connection. This results in a larger contact area, easier positioning, and easier control of welding quality, improving the connection reliability between the temperature acquisition component 40 and the temperature sampling harness 51, thereby improving the reliability of the battery device. Moreover, when welding the temperature acquisition component 40 and the temperature sampling harness 51, they can be welded in the same process as the voltage sampling component 60 on the main circuit board 50 and the busbar 30, optimizing the assembly process and improving assembly efficiency.

[0107] According to some embodiments of this application, please refer to Figures 5 to 10 The battery device 100 also includes a voltage sampling element 60, which is electrically connected to the bus 30. Multiple sampling points, including voltage sampling points, are located on the voltage sampling element 60. The wiring harness 53 includes a voltage sampling wiring harness 52. The first wiring harness segment 531 of the voltage sampling wiring harness 52 is welded to the voltage sampling element 60, and the second wiring harness segment 532 of the voltage sampling wiring harness 52 is electrically connected to the output terminal.

[0108] Temperature sampling harness 51 and voltage sampling harness 52 are both part of multiple harnesses in the main circuit board 50, meaning that the multiple harnesses 53 in the main circuit board 50 also include voltage sampling harness 52. The first harness segment 531 of voltage sampling harness 52 is soldered to voltage sampling component 60. Voltage sampling component 60 is a connector component that is soldered to voltage sampling harness 52 on busbar 30. Voltage sampling harness 52 achieves electrical connection with busbar 30 through soldering to voltage sampling component 60, thereby realizing the acquisition of voltage signal from battery cell 20.

[0109] The voltage sampling harness 52 and the voltage sampling component 60 can be soldered together. Similarly, the temperature sampling harness 51 and the auxiliary circuit board 43 can also be soldered together.

[0110] In the above scheme, the voltage sampling point is located on the voltage sampling component 60. The first wire segment 531 of the voltage sampling wire harness 52 is welded to the voltage sampling component 60. The connection method between the voltage sampling wire harness 52 and the voltage sampling component 60 is the same as the connection method between the temperature sampling wire harness 51 and the auxiliary circuit board 43. They can be carried out in the same welding process, which simplifies the assembly process and improves the assembly efficiency of the battery device.

[0111] According to some embodiments of this application, the auxiliary circuit board 43 is connected to the side of the mounting bracket 41 facing the battery cell 20; the temperature sampling harness 51 is connected to the side of the auxiliary circuit board 43 facing the battery cell 20, and the voltage sampling harness 52 is connected to the side of the voltage sampling device 60 facing the battery cell 20.

[0112] The auxiliary circuit board 43 is connected to the side of the mounting bracket 41 facing the battery cell 20, meaning that the auxiliary circuit board 43 is located on the side of the mounting bracket 41 facing the battery cell 20 and connected to the mounting bracket 41. The temperature sampling harness 51 is connected to the side of the auxiliary circuit board 43 facing the battery cell 20, and the voltage sampling harness 52 is connected to the side of the voltage sampling element 60 facing the battery cell 20. That is, the temperature sampling harness 51 is located on the side of the auxiliary circuit board 43 facing away from the mounting bracket 41, and the voltage sampling harness 52 is located on the side of the voltage sampling element 60 facing away from the busbar 30.

[0113] In the above scheme, the auxiliary circuit board 43 is connected to the side of the mounting bracket 41 facing the battery cell 20, the temperature sampling harness 51 is connected to the side of the auxiliary circuit board 43 facing the battery cell 20, and the voltage sampling harness 52 is connected to the side of the voltage sampling component 60 facing the battery cell 20. That is, both the temperature sampling harness 51 and the voltage sampling harness 52 are located on the side facing the battery cell 20, which is more conducive to the welding of the temperature sampling harness 51 and the auxiliary circuit board 43 and the voltage sampling harness 52 and the voltage sampling component 60 in the same process, thus optimizing the assembly process of the temperature sampling harness 51 and the auxiliary circuit board 43 and the voltage sampling harness 52 and the voltage sampling component 60.

[0114] According to some embodiments of this application, the battery device further includes a carrier 70, which is disposed on the side of the main circuit board 50 facing the battery cell 20. The busbar 30 and the temperature acquisition component are both located on the side of the carrier 70 facing the main circuit board 50. The surface of the side of the carrier 70 facing the main circuit board 50 has an adhesive layer. At least a portion of the temperature sampling harness 51 and the temperature acquisition component are bonded to the carrier 70 through the adhesive layer, so that the relative positions of the temperature sampling harness 51 and the temperature acquisition component on the carrier 70 are fixed. At least a portion of the voltage sampling harness 52 and the busbar 30 are bonded to the carrier 70 through the adhesive layer, so that the relative positions of the voltage sampling harness 52 and the busbar 30 on the carrier 70 are fixed.

[0115] The carrier 70 refers to the support structure disposed on the side of the battery cell 20 facing the busbar 30. The carrier 70 can be made of insulating material, for example, PI or PET. The carrier 70 can provide insulation and isolation for the main circuit board 50 composed of the battery cell 20, the busbar 30, the temperature sampling harness 51, and the voltage sampling harness 52. The side of the carrier 70 facing away from the battery cell group 24 has an adhesive layer, which refers to the adhesive or bonding agent disposed on the side of the carrier 70 facing away from the battery cell group 24. The adhesive layer allows the temperature sampling harness 51 and voltage sampling harness 52 to be initially positioned on the carrier 70, allowing a portion of the temperature sampling harness 51 to extend to the corresponding position on the auxiliary circuit board 43 and a portion of the voltage sampling harness 52 to extend to the corresponding position on the voltage sampling component 60. The adhesive layer bonds and positions the temperature sampling harness 51 and voltage sampling harness 52, making it less likely for them to shift during welding of the temperature sampling harness 51 to the auxiliary circuit board 43 and the voltage sampling harness 52 to the voltage sampling component 60. This reduces the welding difficulty of the temperature sampling harness 51 to the auxiliary circuit board 43 and the voltage sampling harness 52 to the voltage sampling component 60, and improves the welding efficiency of the temperature sampling harness 51 to the auxiliary circuit board 43 and the voltage sampling harness 52 to the voltage sampling component 60.

[0116] In the above scheme, the surface of the carrier 70 facing the main circuit board 50 has an adhesive layer. When the temperature sampling harness 51 is soldered to the auxiliary circuit board 43 and the voltage sampling harness 52 is soldered to the voltage sampling device 60, the adhesive layer can play a role in pre-positioning the temperature sampling harness 51 and the voltage sampling harness 52. The positions of the temperature sampling harness 51 and the voltage sampling harness 52 are not easily displaced, which reduces the soldering difficulty of the temperature sampling harness 51 to the auxiliary circuit board 43 and the voltage sampling harness 52 to the voltage sampling device 60, and improves the soldering effect and efficiency of the temperature sampling harness 51 to the auxiliary circuit board 43 and the voltage sampling harness 52 to the voltage sampling device 60.

[0117] According to some embodiments of this application, the carrier 70 is a thin film of insulating material with a thickness of 0.1mm-0.5mm.

[0118] The material of the carrier 70 can be PI or PET, and the thickness of the film is 0.1mm-0.5mm. For example, the thickness of the film can be 0.1mm, 0.2mm, 0.3mm or 0.5mm, etc. The specific thickness of the film can be determined according to the actual situation.

[0119] By using a thin film made of insulating material for the carrier 70, the carrier 70 can provide insulation between the battery cell 20 and the busbar 30, as well as between the battery cell 20 and the main circuit board 50, reducing the risk of short circuits between the busbar 30, the main circuit board 50, and the battery cell 20, and improving the safety of the battery device. Furthermore, the thickness of the film is controlled at 0.1mm-0.5mm, which meets the load-bearing strength requirements of the busbar 30 and the main circuit board 50 without excessively occupying internal space in the battery device.

[0120] According to some embodiments of this application, the voltage sampling harness 52 is connected to the voltage sampling element 60 by soldering, and the temperature sampling harness 51 is connected to the auxiliary circuit board 43 by soldering.

[0121] By soldering the voltage sampling harness 52 to the voltage sampling component 60 and the temperature sampling harness 51 to the auxiliary circuit board 43, the process is simple, low-cost, and has high conductivity stability.

[0122] According to some embodiments of this application, the busbar 30 has a notch, and the outer periphery of the mounting bracket 41 has a slot 411 that engages with the periphery of the notch.

[0123] The notch refers to the gap area formed by a piece being missing from one side of the busbar 30, and the periphery of the notch refers to the edge area around the opening of the notch. The outer periphery of the mounting bracket 41 is provided with a groove 411, which means that the outer periphery of the mounting bracket 41 is provided with a groove structure. The groove 411 extends along the circumference of the mounting bracket 41 and is engaged with the periphery of the notch. In this way, the mounting bracket 41 is installed at the notch of the busbar 30, and at least part of the notch is filled by the mounting bracket 41.

[0124] The notch can be in various shapes, including square, triangular, or trapezoidal, and the shape of the mounting bracket 41 is adapted to the shape of the notch. For example, when the notch is square, the mounting bracket 41 is rectangular, and the mounting bracket 41 is engaged with the periphery of the notch through the slot 411 on its outer periphery.

[0125] In the above solution, by providing a notch on the busbar 30 and a slot 411 on the outer periphery of the mounting bracket 41, the mounting bracket 41 is snapped into the opening of the notch. The periphery of the notch provides support and limiting for the mounting bracket 41, allowing the mounting bracket 41 to be installed on the busbar 30 relatively quickly and stably. Furthermore, the slot 411 on the outer periphery of the mounting bracket 41 engages with the periphery of the notch, making the installation of the mounting bracket 41 on the busbar 30 convenient and quick, and ensuring high installation reliability of the temperature acquisition component 40.

[0126] According to some embodiments of this application, the auxiliary circuit board 43 includes a conductive layer 431, a first insulating layer 432, and a second insulating layer stacked together. The first insulating layer 432 is disposed on the side of the conductive layer 431 facing away from the mounting bracket 41, and the second insulating layer is disposed on the side of the conductive layer 431 facing the mounting bracket 41. The first insulating layer 432 is provided with a first opening, and the conductive layer 431 includes a first exposed area 434 exposed through the first opening. The temperature sampling harness 51 is soldered to the first exposed area 434.

[0127] The conductive layer 431 is made of a metallic conductive material, such as copper or aluminum. A first insulating layer 432 is disposed on the side of the conductive layer 431 facing away from the mounting bracket 41, and a second insulating layer is disposed on the side of the conductive layer 431 facing the mounting bracket 41. That is, the first insulating layer 432 and the second insulating layer are respectively disposed on opposite sides of the conductive layer 431 in the thickness direction, and the second insulating layer is closer to the mounting bracket 41 than the first insulating layer 432. The first insulating layer 432 and the second insulating layer provide insulation for the conductive layer 431. The first insulating layer 432 has a first opening, and the conductive layer 431 includes a first exposed area 434 exposed through the first opening. That is, the area of ​​the first exposed area 434 of the conductive layer 431 is not provided with the first insulating layer 432. The first insulating layer 432 is located on the side of the conductive layer 431 facing the temperature sampling harness 51. The conductive layer 431 is soldered to the temperature sampling harness 51 through the first exposed area 434 on the first insulating layer 432, thereby realizing the electrical connection between the auxiliary circuit board 43 and the temperature sampling harness 51.

[0128] The conductive layer 431 is made of copper foil, and the first insulating layer 432 and the second insulating layer can be made of polyimide (PI) or polyester (PET). In this embodiment, the first insulating layer 432 and the second insulating layer are made of PI film.

[0129] In the above scheme, the auxiliary circuit board 43 includes a conductive layer 431, a first insulating layer 432 and a second insulating layer stacked together. By providing a first opening on the first insulating layer 432, a first exposed area 434 can be formed on the conductive layer 431. In this way, the auxiliary circuit board 43 can be directly soldered to the temperature sampling harness 51 through the first exposed area 434 on the conductive layer 431, thereby realizing the electrical connection between the temperature sampling harness 51 and the auxiliary circuit board 43. The connection between the temperature sampling harness 51 and the auxiliary circuit board 43 has high reliability and is convenient and quick.

[0130] According to some embodiments of this application, there are two first exposed areas 434, which are spaced apart. The temperature sampling harness 51 includes two sub-temperature sampling harnesses, which are respectively welded to the two first exposed areas 434.

[0131] There are two first exposed areas 434, which means there are two first openings on the first insulating layer 432. Correspondingly, the temperature sampling harness 51 includes two sub-temperature sampling harnesses, each corresponding to one of the two first exposed areas 434. The two first exposed areas 434 are spaced apart, meaning there is a gap between them.

[0132] In the above scheme, two first exposed areas 434 are set, and two sub-temperature sampling wire bundles are respectively welded to the two first exposed areas 434 to realize the closed loop of temperature detection signal transmission. The two first exposed areas 434 are set alternately, that is, the two sub-temperature sampling wire bundles are set alternately, which reduces the risk of interference or short circuit between the two sub-temperature sampling wire bundles and improves the stability of temperature signal transmission.

[0133] According to some embodiments of this application, the temperature acquisition component 40 further includes a thermal pad 44, which is disposed between the auxiliary circuit board 43 and the battery cell 20. The temperature detection component 42 is thermally connected to the battery cell 20 through the thermal pad 44. On the same projection plane perpendicular to the first direction X, the orthographic projection of the thermal pad 44 is located between the orthographic projections of the two first exposed areas 434, where the first direction X is the thickness direction of the auxiliary circuit board 43.

[0134] The thermal pad 44 is a thermally conductive component disposed between the auxiliary circuit board 43 and the battery cell 20. The thermal pad 44 has good thermal conductivity, allowing it to transfer heat from the battery cell 20 to the temperature detection component 42, thus enabling the temperature detection component 42 to more accurately collect temperature information from the battery cell 20. The thermal pad 44 is made of a highly thermally conductive material; for example, the material of the thermal pad 44 may include silicone, polyurethane, or acrylic.

[0135] On the same projection plane perpendicular to the first direction X, the orthographic projection of the thermal pad 44 is located between the orthographic projections of the two first exposed areas 434, which means that the orthographic projection of the thermal pad 44 does not overlap with the orthographic projections of the two first exposed areas 434, and the thermal pad 44 is located between the two first exposed areas 434.

[0136] Specifically, the thickness of the thermal pad 44 is greater than the outer diameter of the temperature sampling harness 51. After the thermal pad 44 is placed on the auxiliary circuit board 43, the thermal pad 44 is thermally connected to the battery cell. Because the thickness of the thermal pad 44 is greater than the outer diameter of the temperature sampling harness 51, the temperature sampling harness 51 and the battery cell 20 are spaced apart along the first direction X, so that the temperature sampling harness 51 is suspended and will not come into contact with the battery cell 20. The temperature sampling harness 51 is less likely to have a short circuit with the casing of the battery cell 20.

[0137] In the above scheme, through the setting of the thermal pad 44 on the auxiliary circuit board 43, the temperature acquisition component 40 is thermally connected to the battery cell 20 through the thermal pad 44, and the temperature detection component 42 can collect the temperature of the battery cell 20 through the thermal pad 44, reducing heat loss and improving the accuracy of the temperature acquisition component 40 in collecting the temperature of the battery cell 20. Since the orthographic projection of the thermal pad 44 is located between the orthographic projections of the two first exposed areas 434, that is, after the temperature sampling harness 51 is soldered to the first exposed area 434, the thermal pad 44 is located in the area between the two sub-temperature sampling harnesses. The thermal pad 44 will not interfere with the sub-temperature sampling harnesses, which is beneficial to the spatial layout of the sub-temperature sampling harnesses on the auxiliary circuit board 43. Furthermore, because the thermal pad 44 and the sub-temperature sampling harnesses are spaced apart, the heat radiation generated by the heat transferred by the thermal pad 44 is less likely to affect the sub-temperature sampling harnesses, which helps to ensure the stability of the signal transmission of the sub-temperature sampling harnesses.

[0138] According to some embodiments of this application, the second insulating layer is provided with a second opening, the conductive layer 431 includes a second exposed area exposed through the second opening, and the temperature sensing component 42 is welded to the second exposed area.

[0139] The second insulating layer has a second opening, and the conductive layer 431 includes a second exposed area exposed through the second opening. That is, the area of ​​the second exposed area of ​​the conductive layer 431 is not provided with the second insulating layer. The second insulating layer is located on the side of the conductive layer 431 facing the mounting bracket 41. The conductive layer 431 is electrically connected to the temperature detection component 42 through the second exposed area on the second insulating layer.

[0140] In the above scheme, by providing a second opening on the second insulating layer, a second exposed area can be formed on the conductive layer 431. In this way, the auxiliary circuit board 43 can be electrically connected to the temperature detection component 42 through the second exposed area on the conductive layer 431. The temperature signal detected by the temperature detection component 42 is transmitted through the auxiliary circuit board 43 and the temperature sampling harness 51. The connection between the auxiliary circuit board 43 and the temperature detection component 42 is convenient and quick.

[0141] According to some embodiments of this application, the auxiliary circuit board 43 is a flexible circuit board.

[0142] The auxiliary circuit board 43 is a flexible circuit board, which can be an FPC. The auxiliary circuit board 43 is flexible and can be connected to the mounting bracket 41 by adhesive bonding. The auxiliary circuit board 43 is easy and quick to install and has high installation stability.

[0143] In the above scheme, the auxiliary circuit board 43 is a flexible circuit board. Flexible circuit boards have the advantages of being flexible and bendable, thin, lightweight, and having high signal transmission stability, which can facilitate the internal space layout of the temperature acquisition component 40 and reduce the structural size of the temperature acquisition component 40. Moreover, compared with the auxiliary circuit board 43 being a rigid circuit board, the flexible auxiliary circuit board 43 can be connected to the mounting bracket 41 by means of adhesive bonding or other methods, making the assembly of the temperature acquisition component 40 more convenient and faster.

[0144] According to some embodiments of this application, the voltage sampling element 60 includes a stacked aluminum layer and a copper layer, the aluminum layer being electrically connected to the bus 30, and the copper layer being welded to the voltage sampling harness 52.

[0145] The busbar 30 is made of aluminum, and the inner conductor of the voltage sampling harness 52 is made of copper. The voltage sampling component 60 includes stacked aluminum and copper layers. The aluminum layer of the voltage sampling component 60 is welded to the aluminum busbar 30, and the copper layer is welded to the copper voltage sampling harness 52. The welding effect between two parts made of the same material is better.

[0146] In the above scheme, the voltage sampling component 60 adopts a composite structure of aluminum and copper layers. The voltage sampling component 60 is welded to the bus 30 through the aluminum layer, which allows the bus 30 to be made of aluminum, and the welding effect of the aluminum layer with the bus 30 of the same material is better. Similarly, by welding the copper layer to the voltage sampling harness 52, the conductor inside the voltage sampling harness 52 can be made of copper, thus improving the welding effect of the copper layer with the voltage sampling harness 52 of the same material.

[0147] In some embodiments, please refer to Figures 1 to 10The battery device 100 includes battery cells 20, busbars 30, and a main circuit board 50. The busbars 30 are used to electrically connect the electrode terminals 23 of at least two battery cells 20. Sampling points are provided on multiple busbars 30 and / or multiple battery cells 20. The main circuit board 50 includes an output terminal and multiple parallel wiring harnesses 53. The multiple wiring harnesses 53 are used to connect to multiple sampling points. Each wiring harness 53 includes a conductor and an insulating shell, with the insulating shell covering the outside of the conductor. Each wiring harness 53 includes a first wiring harness segment 531 and a second wiring harness segment 532 connected to each other in its extending direction. The first wiring harness segment 531 connects to the sampling point, and the end of the second wiring harness segment 532 away from the first wiring harness segment 531 is used to connect to the output terminal. The first wiring harness segment 531 of any wiring harness 53 is connected to other sampling points. The wire harnesses 53 are disconnected from each other, and the insulating shell of the second wire harness segment 532 of the wire harness 53 is connected to the insulating shell of the wire harness 53 connected to other sampling points. The multiple sampling points include temperature sampling points. The wire harness 53 includes a temperature sampling wire harness 51. The battery device also includes a temperature acquisition component 40 located at the temperature sampling point. The temperature acquisition component 40 includes a mounting bracket 41 and a temperature detection component 42. The temperature detection component 42 is located on the mounting bracket 41, and the temperature sampling wire harness 51 is electrically connected to the temperature detection component 42. The temperature acquisition component 40 also includes an auxiliary circuit board 43. The auxiliary circuit board 43 is connected to one side of the mounting bracket 41 and is soldered to the temperature detection component 42 and the first wire harness segment 531 of the temperature sampling wire harness 51 respectively, so as to indirectly connect the temperature detection component 42 and the temperature sampling wire harness 51. The battery device also includes a voltage sampling unit 60, which is electrically connected to the bus 30. Multiple sampling points, including voltage sampling points, are located on the voltage sampling unit 60. The wiring harness 53 includes a voltage sampling wiring harness 52. The first wiring harness segment 531 of the voltage sampling wiring harness 52 is welded to the voltage sampling unit 60, and the second wiring harness segment 532 of the voltage sampling wiring harness 52 is electrically connected to the output terminal.

[0148] The temperature acquisition component 40 also includes an auxiliary circuit board 43, which integrates the two wires of the traditional temperature detection component 42 into one unit, thus increasing the compactness and integration of the temperature acquisition component 40. Furthermore, the auxiliary circuit board 43 is connected to one side of the mounting bracket 41 and solders the temperature detection component 42 and the first wire harness segment 531 of the temperature sampling harness 51 to it. Compared to the traditional method of soldering two wires from the temperature acquisition component 40 to the main circuit board 50's harness 53 using a wire-to-wire connection, this method changes the connection surface from a traditional wire-to-wire connection to a wire-to-surface connection, resulting in a larger contact area, easier positioning, and easier control of soldering quality. This improves the connection reliability between the temperature acquisition component 40 and the temperature sampling harness 51, thereby improving the reliability of the battery device. The connection method between the voltage sampling harness 52 and the voltage sampling component 60 is the same as the connection method between the temperature sampling harness 51 and the auxiliary circuit board 43, and can be performed in the same soldering process, simplifying the assembly process and improving the assembly efficiency of the battery device.

[0149] In some embodiments, the auxiliary circuit board 43 is connected to the side of the mounting bracket 41 facing the battery cell 20; the temperature sampling harness 51 is connected to the side of the auxiliary circuit board 43 facing the battery cell 20, and the voltage sampling harness 52 is connected to the side of the voltage sampling component 60 facing the battery cell 20. The battery device also includes a carrier 70, which is disposed on the side of the main circuit board 50 facing the battery cell 20. The busbar 30 and the temperature acquisition component are both located on the side of the carrier 70 facing the main circuit board 50. The surface of the side of the carrier 70 facing the main circuit board 50 has an adhesive layer. At least a portion of the temperature sampling harness 51 and the temperature acquisition component are bonded to the carrier 70 through the adhesive layer to fix the relative positions of the temperature sampling harness 51 and the temperature acquisition component on the carrier 70. At least a portion of the voltage sampling harness 52 and the busbar 30 are bonded to the carrier 70 through the adhesive layer to fix the relative positions of the voltage sampling harness 52 and the busbar 30 on the carrier 70. The carrier component 70 is an insulating film with a thickness of 0.1mm-0.5mm. The voltage sampling harness 52 is connected to the voltage sampling component 60 by soldering, and the temperature sampling harness 51 is connected to the auxiliary circuit board 43 by soldering.

[0150] Both the temperature sampling harness 51 and the voltage sampling harness 52 are located on the side facing the battery cell 20, which facilitates the welding of the temperature sampling harness 51 to the auxiliary circuit board 43 and the voltage sampling harness 52 to the voltage sampling component 60 in the same process, thus optimizing the assembly process. Because the surface of the carrier 70 facing the main circuit board 50 has an adhesive layer, the adhesive layer can pre-position the temperature sampling harness 51 and the voltage sampling harness 52 during welding, preventing them from shifting. This reduces the welding difficulty and improves the welding effect and efficiency.

[0151] In some embodiments, the auxiliary circuit board 43 includes a conductive layer 431, a first insulating layer 432, and a second insulating layer stacked together. The first insulating layer 432 is disposed on the side of the conductive layer 431 facing away from the mounting bracket 41, and the second insulating layer is disposed on the side of the conductive layer 431 facing the mounting bracket 41. The first insulating layer 432 has a first opening, and the conductive layer 431 includes a first exposed area 434 exposed through the first opening. The temperature sampling harness 51 is soldered to the first exposed area 434. There are two first exposed areas 434, which are spaced apart. The temperature sampling harness 51 includes two sub-temperature sampling harnesses, and the two sub-temperature sampling harnesses are respectively soldered to the two first exposed areas 434. The temperature acquisition component 40 also includes a thermally conductive pad 44, which is disposed between the auxiliary circuit board 43 and the battery cell 20. The temperature detection component 42 is thermally connected to the battery cell 20 through the thermally conductive pad 44. On the same projection plane perpendicular to the first direction X, the orthographic projection of the thermally conductive pad 44 is located between the orthographic projections of the two first exposed areas 434. The first direction X is the thickness direction of the auxiliary circuit board 43. The auxiliary circuit board 43 is a flexible circuit board. The voltage sampling component 60 includes a stacked aluminum layer and a copper layer. The aluminum layer is electrically connected to the busbar 30, and the copper layer is soldered to the voltage sampling harness 52.

[0152] By providing a first opening on the first insulating layer 432, a first exposed area 434 can be formed on the conductive layer 431. This allows the auxiliary circuit board 43 to be directly soldered to the temperature sampling harness 51 through the first exposed area 434 on the conductive layer 431, thereby achieving electrical connection between the temperature sampling harness 51 and the auxiliary circuit board 43. The connection between the temperature sampling harness 51 and the auxiliary circuit board 43 is highly reliable and convenient. The temperature detection component 42 can collect the temperature of the battery cell 20 through the thermal pad 44, reducing heat loss and improving the accuracy of the temperature acquisition component 40 in collecting the temperature of the battery cell 20. Since the orthographic projection of the thermal pad 44 lies between the orthographic projections of the two first exposed areas 434, that is, after the temperature sampling harness 51 is soldered to the first exposed area 434, the thermal pad 44 is located in the area between the two sub-temperature sampling harnesses. The thermal pad 44 will not interfere with the sub-temperature sampling harnesses, which is beneficial for the spatial layout of the sub-temperature sampling harnesses on the auxiliary circuit board 43. Furthermore, because the thermal pad 44 and the sub-temperature sampling harness are spaced apart, the heat radiation generated by the heat transferred by the thermal pad 44 is less likely to affect the sub-temperature sampling harness, which helps to ensure the stability of the signal transmission of the sub-temperature sampling harness.

[0153] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Multiple battery cells and multiple busbars, wherein the busbars are used to electrically connect the electrode terminals of at least two of the battery cells, and each of the multiple busbars and / or the multiple battery cells is provided with a sampling point; The main circuit board includes an output terminal and multiple wire harnesses arranged side by side. The multiple wire harnesses are used to connect to multiple sampling points. Each wire harness includes a conductor and an insulating shell. The insulating shell covers the outside of the conductor. Each wire harness includes a first wire harness segment and a second wire harness segment connected to each other in its extending direction. The first wire harness segment is connected to the sampling point. The end of the second wire harness segment away from the first wire harness segment is used to connect to the output terminal. The first wire harness segment of any wire harness is disconnected from the wire harnesses connected to other sampling points. The insulating shell of the second wire harness segment of the wire harness is connected to the insulating shell of the wire harnesses connected to other sampling points. The plurality of sampling points include temperature sampling points, the wiring harness includes a temperature sampling wiring harness, the battery device further includes a temperature acquisition component disposed at the temperature sampling points, the temperature acquisition component includes a mounting bracket and a temperature detection component, the temperature detection component is disposed on the mounting bracket, and the temperature sampling wiring harness is electrically connected to the temperature detection component; The temperature acquisition component also includes an auxiliary circuit board, which is connected to one side of the mounting bracket and has the temperature detection component and the first wire harness segment of the temperature sampling wire harness soldered to it respectively, so as to indirectly connect the temperature detection component and the temperature sampling wire harness.

2. The battery device according to claim 1, characterized in that, The battery device further includes a voltage sampling device electrically connected to the busbar, and the plurality of sampling points include voltage sampling points located on the voltage sampling device. The wiring harness includes a voltage sampling wiring harness, the first segment of which is welded to the voltage sampling element, and the second segment of which is electrically connected to the output terminal.

3. The battery device according to claim 2, characterized in that, The auxiliary circuit board is connected to the side of the mounting bracket facing the battery cell; The temperature sampling harness is connected to the side of the auxiliary circuit board facing the battery cell, and the voltage sampling harness is connected to the side of the voltage sampling device facing the battery cell.

4. The battery device according to claim 3, characterized in that, The battery device further includes a carrier component, which is disposed on the side of the main circuit board facing the battery cell. The busbar and the temperature acquisition component are also located on the side of the carrier component facing the main circuit board. The carrier has an adhesive layer on the side of its surface facing the main circuit board. At least a portion of the temperature sampling harness and the temperature acquisition component are bonded to the carrier through the adhesive layer, thereby fixing the relative positions of the temperature sampling harness and the temperature acquisition component on the carrier. At least a portion of the voltage sampling harness and the busbar are bonded to the carrier through the adhesive layer, thereby fixing the relative positions of the voltage sampling harness and the busbar on the carrier.

5. The battery device according to claim 4, characterized in that, The carrier is a thin film made of insulating material, and the thickness of the film is 0.1mm-0.5mm.

6. The battery device according to claim 3, characterized in that, The voltage sampling harness is connected to the voltage sampling element by soldering, and the temperature sampling harness is connected to the auxiliary circuit board by soldering.

7. The battery device according to any one of claims 1-6, characterized in that, The manifold has a notch, and the outer periphery of the mounting bracket has a slot that engages with the periphery of the notch.

8. The battery device according to any one of claims 1-6, characterized in that, The auxiliary circuit board includes a conductive layer, a first insulating layer, and a second insulating layer stacked together. The first insulating layer is disposed on the side of the conductive layer facing away from the mounting bracket, and the second insulating layer is disposed on the side of the conductive layer facing the mounting bracket. The first insulating layer has a first opening, and the conductive layer includes a first exposed area exposed through the first opening. The temperature sampling harness is soldered to the first exposed area.

9. The battery device according to claim 8, characterized in that, The number of the first exposed areas is two, and the two first exposed areas are set at intervals. The temperature sampling harness includes two sub-temperature sampling harnesses, and the two sub-temperature sampling harnesses are respectively welded to the two first exposed areas.

10. The battery device according to claim 9, characterized in that, The temperature acquisition component also includes: A thermal pad is disposed between the auxiliary circuit board and the battery cell, and the temperature detection component is thermally connected to the battery cell through the thermal pad. On the same projection plane perpendicular to the first direction, the orthographic projection of the thermal pad is located between the orthographic projections of the two first exposed areas, and the first direction is the thickness direction of the auxiliary circuit board.

11. The battery device according to claim 8, characterized in that, The second insulating layer has a second opening, and the conductive layer includes a second exposed area exposed through the second opening, to which the temperature sensing component is welded.

12. The battery device according to any one of claims 1-6, characterized in that, The auxiliary circuit board is a flexible circuit board.

13. The battery device according to claim 2, characterized in that, The voltage sampling device includes a stacked aluminum layer and a copper layer, the aluminum layer being electrically connected to the busbar, and the copper layer being soldered to the voltage sampling harness.

14. An electrical appliance, characterized in that, The device includes a battery device as described in any one of claims 1-13, wherein the power supply device is used to provide electrical energy.

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