Battery device and electric device

Abstract

The application relates to the battery technical field and provides a battery device and a power utilization device. The battery device comprises a box body, a battery monomer, a sampling assembly and a welding part. The battery monomer and the sampling assembly are arranged in the box body. The battery monomer comprises a pole. The sampling assembly comprises a sampling plate, a voltage sampling terminal and an electric connecting piece. The voltage sampling terminal is electrically connected to the sampling plate. The electric connecting piece and the voltage sampling terminal are stacked on the pole along a first direction. The welding part penetrates the electric connecting piece, the voltage sampling terminal and the pole which are stacked along the first direction, so that the electric connecting piece, the voltage sampling terminal and the pole are connected to each other through the same welding part. The voltage sampling terminal is located between the electric connecting piece and the pole. The electric connecting piece is provided with a through hole. The through hole is used for observing the positional relationship between the voltage sampling terminal and the pole, so that the connection reliability is ensured. The application can simplify the welding process, reduce the number of welding points, improve the connection reliability and production efficiency.

Description

Technical Field

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

[0002] Currently, in the manufacturing process of existing battery devices, sampling components are typically required to achieve real-time monitoring of the operating parameters of individual battery cells. However, in actual assembly, the sampling components and battery cells need to be welded multiple times, resulting in cumbersome processes, low production efficiency, and poor connection reliability. Utility Model Content

[0003] In view of the above-mentioned technical problems, the purpose of this application is to provide a battery device and an electrical device, which aims to solve the problems of low production efficiency and poor connection reliability caused by multiple welding in the assembly process of existing battery sampling components.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] In a first aspect, embodiments of this application provide a battery device, comprising:

[0006] Box;

[0007] A battery cell and a sampling assembly are housed inside a box. The battery cell includes a terminal post, and the sampling assembly includes a sampling plate, a voltage sampling terminal, and an electrical connector. The voltage sampling terminal is electrically connected to the sampling plate, and the electrical connector and the voltage sampling terminal are stacked on the terminal post along a first direction.

[0008] The welding part extends through the stacked electrical connectors, voltage sampling terminals, and poles along a first direction to connect the electrical connectors, voltage sampling terminals, and poles to each other via the same welding part;

[0009] The voltage sampling terminal is located between the electrical connector and the electrode. The electrical connector has a through hole for observing the positional relationship between the voltage sampling terminal and the electrode. On a projection plane perpendicular to the first direction, at least a portion of the orthographic projection of the through hole coincides with at least a portion of the orthographic projection of the voltage sampling terminal and at least a portion of the orthographic projection of the electrode.

[0010] In the above technical solution, the electrical connectors, voltage sampling terminals, and battery cell terminals are stacked and integrated using a single through-hole weld, requiring only one welding step to complete the connection. This structure simplifies the assembly process, reduces the number of weld points, and improves connection reliability and production efficiency.

[0011] By setting through holes on the electrical connectors, the problem of the sampling terminals being difficult to see due to the covering of the electrical connectors is solved. This makes it easier to visually confirm whether the sampling terminals are accurately placed on the poles during the assembly process, thereby ensuring the reliability of the electrical connection and improving the assembly yield of the battery device.

[0012] In some embodiments, on a projection plane perpendicular to the first direction, the orthographic projection of the through hole and the orthographic projection of the welded portion are offset.

[0013] In the above technical solution, by staggering the through holes and the welding parts on the projection plane perpendicular to the stacking direction, thermal damage and deformation interference to the through hole structure during the welding process are avoided, ensuring that the through holes remain clearly visible and facilitating accurate judgment of the assembly position of the voltage sampling terminals; and ensuring the integrity of the welding area and the reliability of the connection.

[0014] In some embodiments, on a projection plane perpendicular to the first direction, at least a portion of the orthographic projection of the electrical connector, at least a portion of the orthographic projection of the voltage sampling terminal, and at least a portion of the orthographic projection of the pole coincide to form an overlapping region, and at least a portion of the orthographic projection of the welded portion is located within the overlapping region.

[0015] In the above technical solution, by ensuring that the orthographic projections of the electrical connector, voltage sampling terminal, and pole on the projection plane perpendicular to the stacking direction at least partially overlap, and by placing the welding part in the overlapping area, it can be ensured that the welding part can connect all three at the same time, effectively improving the connection reliability.

[0016] In some embodiments, the electrical connector includes a first electrical connector, which includes a first connecting portion, a second connecting portion, and a bent portion. The first connecting portion and the second connecting portion are respectively used to weld the terminals of two adjacent battery cells arranged side by side along a second direction. The bent portion is connected between the first connecting portion and the second connecting portion. The second direction is perpendicular to the first direction.

[0017] The welding part includes a first welding part and a second welding part. The first welding part is connected to a first connection part, a voltage sampling terminal and a terminal of a battery cell, and the second welding part is connected to a second connection part and a terminal of another battery cell.

[0018] Along the second direction, a first weld portion is formed on the side of the first connecting portion away from the bend, and / or, a second weld portion is formed on the side of the second connecting portion away from the bend.

[0019] In the above technical solution, by setting a bending portion in the first electrical connector to provide structural bridging function and assembly adaptability, and setting the welding portion on the edge area of ​​the corresponding connection portion away from the bending portion, the welding portion is far away from the bending portion that causes large vibration amplitude due to large bending and suspension, thereby reducing the risk of welding cracking and improving welding reliability.

[0020] In some embodiments, the electrical connector includes a first electrical connector, which includes a first connecting portion, a second connecting portion, and a connecting portion. The first connecting portion includes a first main body portion, and the second connecting portion includes a second main body portion. The first main body portion and the second main body portion are respectively used to weld the electrode posts of two adjacent battery cells arranged side by side along a second direction. The connecting portion is connected between the first main body portion and the second main body portion. The second direction is perpendicular to the first direction.

[0021] The first connecting portion further includes a first cantilever portion connected to the first main body portion. In the second direction, the first cantilever portion protrudes from the pole post connected to the first main body portion in a direction away from the connecting portion, and the length of the connecting portion is greater than the length of the first cantilever portion; and / or, the second connecting portion further includes a second cantilever portion connected to the second main body portion. In the second direction, the second cantilever portion protrudes from the pole post connected to the second main body portion in a direction away from the connecting portion, and the length of the connecting portion is greater than the length of the second cantilever portion.

[0022] The welding part includes a first welding part and a second welding part. The first welding part is connected to the first main body part, the voltage sampling terminal and the terminal of a battery cell, and the second welding part is connected to the second main body part and the terminal of another battery cell.

[0023] Along the second direction, a first weld portion is formed on the side of the first main body portion away from the connecting portion, and / or, a second weld portion is formed on the side of the second main body portion away from the connecting portion.

[0024] In the above technical solution, by setting a middle connecting part in the first electrical connector with a length greater than that of the edge cantilever portion, it is convenient to connect adjacent battery cells. The welding part is arranged on the edge area of ​​the corresponding main body part away from the connecting part, so that the welding part is far away from the connecting part with a larger vibration amplitude due to its longer length, thereby reducing the risk of cracking of the welding part and improving the fatigue resistance and connection stability of the welding.

[0025] In some embodiments, the electrical connector includes a first electrical connector, which includes a first connecting portion, a second connecting portion, and a deformation portion. The first connecting portion and the second connecting portion are respectively used to weld the terminals of two adjacent battery cells arranged side by side along the second direction. The deformation portion is connected between the first connecting portion and the second connecting portion and is used to match the displacement of the battery cells when they expand or contract along the second direction. The second direction is perpendicular to the first direction.

[0026] The welding part includes a first welding part and a second welding part. The first welding part is connected to a first connection part, a voltage sampling terminal and a terminal of a battery cell, and the second welding part is connected to a second connection part and a terminal of another battery cell.

[0027] Along the second direction, a first weld portion is formed on the side of the first connecting portion away from the deformed portion, and / or, a second weld portion is formed on the side of the second connecting portion away from the deformed portion.

[0028] In the above technical solution, by providing a deformation part in the first electrical connector, the deformation part can deform to adapt to the expansion or contraction deformation of the battery cell, and the welding part is arranged on the edge area of ​​the corresponding connection part away from the deformation part, the influence of stress transmission generated by the deformation part during deformation on the welding part is reduced, thereby reducing the risk of welding part cracking and improving connection reliability.

[0029] In some embodiments, multiple battery cells are arranged side by side along a second direction, which is perpendicular to the first direction;

[0030] The battery device also includes a mounting component and an output electrode base disposed within the housing. The mounting component is disposed on the outside of the battery cell located at the end of the multiple battery cells, and the output electrode base is disposed on the mounting component.

[0031] The electrical connector includes a second electrical connector, which includes a third connecting portion, a fourth connecting portion, and a transition portion. The third connecting portion includes a third main body portion and a third cantilever portion. The third main body portion is used to weld the terminal post of the battery cell located at the end of the plurality of battery cells. In a second direction, the third cantilever portion protrudes from the terminal post connected to the third main body portion in a direction away from the transition portion. The length of the transition portion is greater than the length of the third cantilever portion. The fourth connecting portion is used to connect the output electrode base, and the transition portion connects between the third main body portion and the fourth connecting portion.

[0032] The welding part includes a third welding part, which is connected to the third main body part, the voltage sampling terminal and the terminal post of the battery cell at the end. Along the second direction, the third welding part is formed on the side of the third main body part away from the transition part.

[0033] In the above technical solution, a relatively long transition section is provided in the second electrical connector to achieve reliable bridging between the terminal battery cell and the output electrode base. In order to address the problem that the transition section is prone to large vibration amplitude due to its large length, the third welding section is arranged on the side of the third main body away from the transition section. This can reduce the risk of cracking of the welding section and improve the reliability of the output connection.

[0034] In some embodiments, the sampling assembly further includes a temperature sampling terminal electrically connected to the sampling plate, the temperature sampling terminal being snapped into the electrical connector.

[0035] In the above technical solution, the temperature of the battery cell is collected by setting a temperature sampling terminal, and the welding process is eliminated by the snap-fit ​​method, which improves the ease of assembly and maintainability.

[0036] In some embodiments, the side of the electrical connector facing the battery cell has a snap-fit ​​groove, and the temperature sampling terminal is connected to the snap-fit ​​groove.

[0037] In the above technical solution, by setting a snap-fit ​​groove on the side of the electrical connector facing the battery cell, the assembly of the temperature sampling terminal is facilitated, and the temperature sampling terminal can be made closer to the battery cell, thereby improving the accuracy of temperature acquisition.

[0038] In some embodiments, the battery cell further includes a housing, with terminals disposed on the housing, and the sampling assembly further includes a thermal pad disposed between the temperature sampling terminal and the housing.

[0039] In the above technical solution, by setting a thermal pad between the temperature sampling terminal and the battery cell casing, the heat transfer efficiency is improved, thereby improving the accuracy of temperature signal acquisition; in addition, the thermal pad can play a certain role in buffering and vibration reduction, improving the reliability of temperature sampling.

[0040] In some embodiments, the battery device further includes a battery cell management controller disposed within the housing, and the sampling assembly further includes a connector for connecting the sampling board and the battery cell management controller, respectively.

[0041] In the above technical solution, by setting a connector in the sampling component, the sampling board and the battery cell management controller can be directly connected, eliminating the need for adapter harnesses. Furthermore, the connector supports quick plugging and unplugging, reducing assembly complexity and thus improving production efficiency and maintenance convenience.

[0042] Secondly, embodiments of this application also provide an electrical device, including: the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0043] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application;

[0046] Figure 2This is an exploded view of the battery device provided in the embodiments of this application;

[0047] Figure 3 This is a schematic diagram of the assembly of a battery cell and a sampling assembly provided in an embodiment of this application;

[0048] Figure 4 for Figure 3 Enlarged view of a portion at point A;

[0049] Figure 5 This is a schematic diagram of the welding structure of the welded part provided in an embodiment of this application;

[0050] Figure 6 This is a schematic diagram of the assembly of the electrical connector and the battery cell provided in the embodiments of this application;

[0051] Figure 7 This is a schematic diagram of the assembly of the voltage sampling terminal and the electrode provided in the embodiments of this application;

[0052] Figure 8 One of the assembly schematic diagrams of the first electrical connector provided in the embodiments of this application;

[0053] Figure 9 A second assembly schematic diagram of the first electrical connector provided in an embodiment of this application;

[0054] Figure 10 This is the third assembly schematic diagram of the first electrical connector provided in the embodiments of this application;

[0055] Figure 11 This is an assembly diagram of the second electrical connector provided in an embodiment of this application.

[0056] The following are the labeling elements in the figure:

[0057] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor;

[0058] 11. Box; 111. First box; 112. Second box;

[0059] 12. Battery cell; 121. Terminal post;

[0060] 13. Sampling assembly; 131. Sampling board; 132. Voltage sampling terminal; 133. Electrical connector;

[0061] 1331, Through hole; 134, Connector; 135, First electrical connector; 1351, First connecting part;

[0062] 13511. First main body part; 13512. First cantilever part; 1352. Second connecting part;

[0063] 13521. Second main body part; 13522. Second cantilever part; 1353. Bending part;

[0064] 1354. Connecting part; 1355. Deformation part; 136. Second electrical connector; 1361. Third connecting part;

[0065] 13611. Third main body part; 13612. Third cantilever part; 1362. Fourth connecting part;

[0066] 1363. Transition section;

[0067] 14. Welding section; 141. First welding section; 142. Second welding section; 143. Third welding section;

[0068] 15. Battery cell management controller; 16. Mounting parts; 17. Output terminal base; 18. Screws;

[0069] 19. Adapter; 20. Insulating board. Detailed Implementation

[0070] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0072] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0073] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0074] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0075] In the description of the embodiments of this application, the term "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).

[0076] In the description of the embodiments of this application, the technical terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0077] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0078] In the manufacturing process of existing battery devices, to achieve real-time monitoring of parameters such as battery cell voltage, sampling components are typically installed on the terminals of the battery cells. Traditional sampling component assembly methods generally include the following steps: first, the voltage sampling terminals on the sampling board are pre-connected with electrical connectors (such as terminals, busbars, etc.) by welding to form a composite connection structure; then, this composite structure is welded as a whole to the terminals of the battery cells. This assembly method has the following drawbacks: on the one hand, it requires at least two independent welding operations, leading to a cumbersome process and extended production cycle; on the other hand, multiple welding points are prone to problems such as poor contact and decreased reliability, affecting the reliability of the battery device and the accuracy of signal acquisition.

[0079] Based on this, embodiments of this application provide a welding structure for simplifying the assembly of battery device sampling components. This structure achieves integrated connection through a single through-hole electrical connector, voltage sampling terminal, and battery cell terminal post, requiring only one welding step. This simplifies traditional multi-step welding to a single-step process, thereby improving production efficiency and connection reliability. Furthermore, by providing through holes in the electrical connector, it is easy to visually confirm whether the sampling terminal is accurately placed on the terminal post during assembly, thus ensuring the reliability of the electrical connection and improving the assembly yield of the battery device.

[0080] The battery device disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, etc.

[0081] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0082] Reference Figure 1 As shown, 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 installed inside vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, the battery device 100 can serve as the operating power source for vehicle 1000. 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, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0083] In some embodiments, 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.

[0084] Reference Figure 2 As shown, the battery device 100 mentioned in this application embodiment may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells 12, which may be connected in series via electrical connectors 133.

[0085] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 12.

[0086] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 12 into an independent module. As an example, the battery module can be formed by bundling multiple battery cells 12 together with cable ties.

[0087] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 11 and one or more battery cell assemblies housed in the housing 11.

[0088] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 11 by fixing the battery module in the housing 11.

[0089] As an example, the battery cell assembly can also be housed in the housing 11 by directly fixing multiple battery cells 12 to the housing 11.

[0090] As an example, the housing 11 may include a first housing 111 and a second housing 112. The first housing 111 and the second housing 112 are fastened together to form a closed space inside the housing 11 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 111 may be a top cover or a bottom plate.

[0091] As an example, the housing 11 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 11 forms an enclosed space to accommodate the battery cell assembly.

[0092] In some embodiments, the housing 11 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 11 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 11 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0093] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 12, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles, etc.

[0094] In this embodiment of the application, the battery cell 12 can be a secondary battery, which refers to the battery cell 12 that can be used again after being discharged by recharging to activate the active material.

[0095] The battery cell 12 can be a 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., and the embodiments of this application are not limited to this.

[0096] like Figure 5 and Figure 6 As shown, the first direction X refers to the stacking direction of the electrical connector 133, the voltage sampling terminal 132 and the terminal 121, and the second direction Y refers to the arrangement direction of the multiple battery cells 12, that is, the length direction of the sampling plate 131.

[0097] In some embodiments, refer to Figures 2 to 5 As shown, this application provides a battery device, including: a housing 11, a battery cell 12, a sampling assembly 13, and a welding part 14. The battery cell 12 and the sampling assembly 13 are disposed within the housing 11. The battery cell 12 includes a terminal post 121. The sampling assembly 13 includes a sampling plate 131, a voltage sampling terminal 132, and an electrical connector 133. The voltage sampling terminal 132 is electrically connected to the sampling plate 131. The electrical connector 133 and the voltage sampling terminal 132 are stacked on the terminal post 121 along a first direction X. The welding part 14 penetrates the stacked electrical connector 133, the voltage sampling terminal 132, and the terminal post 121 along the first direction X to connect the electrical components. The component 133, voltage sampling terminal 132, and pole 121 are connected to each other through the same welding part 14. The voltage sampling terminal 132 is located between the electrical connector 133 and the pole 121. The electrical connector 133 is provided with a through hole 1331, which is used to observe the positional relationship between the voltage sampling terminal 132 and the pole 121. On the projection plane perpendicular to the first direction X, at least a part of the orthographic projection of the through hole 1331 coincides with at least a part of the orthographic projection of the voltage sampling terminal 132 and at least a part of the orthographic projection of the pole 121.

[0098] The housing 11 serves as the shell structure of the battery device 100, primarily functioning to encapsulate and protect it. It internally houses components such as the battery cells 12 and the sampling assembly 13, providing them with a stable and reliable operating environment. The housing 11 can be made of materials such as steel or aluminum, possessing a certain structural strength.

[0099] The battery cell 12 serves as an energy storage unit of the battery device 100, and includes terminals 121 for outputting or inputting electrical energy into the battery cell 12. Terminals 121 may include a positive terminal and a negative terminal. Terminals 121 may be made of a metal (such as copper or aluminum) and have good conductivity and solderability.

[0100] The sampling component 13 is primarily responsible for acquiring parameters such as the voltage of the individual battery cells 12. Within the sampling component 13, the sampling board 131 can be a printed circuit board (PCB), flexible printed circuit board (FPC), or flexible copper-clad laminate (FCC) integrating signal processing circuitry, used to acquire the voltage signal of the individual battery cells 12. The voltage sampling terminal 132 can be connected to the long edge of the sampling board 131, serving as an electrical adapter between the sampling board 131 and the terminal 121, used to send the acquired voltage signal to the sampling board 131. The electrical connector 133 is mainly used to electrically connect multiple individual battery cells 12, serving as a current transmission component. The electrical connector 133 can be made of conductive metals such as copper or aluminum. For example, the electrical connector 133 can be an aluminum foil. For example, the electrical connector 133 can connect the positive and negative terminals of two adjacent individual battery cells 12, achieving a series connection. Electrical connectors 133 and voltage sampling terminals 132 are configured to be stacked in the same direction (first direction X) on the terminal posts 121 of the battery cell 12. This integrates the originally scattered connection points, ensuring that the contact surfaces of the three are in close contact, which facilitates subsequent soldering. The electrical connectors 133 may have the same shape or different shapes.

[0101] The welded portion 14 is a through-connection structure that penetrates along the first direction X through the stacked electrical connector 133, voltage sampling terminal 132, and electrode 121, firmly connecting the three into a single unit through a single welding operation. Welding methods may include laser welding, ultrasonic welding, or resistance welding. The cross-sectional shape of the welded portion 14 along the first direction X is not particularly limited; for example, it can be rectangular, conical, etc. As an example, the same laser beam penetrates the electrical connector 133, voltage sampling terminal 132, and electrode 121 along the first direction X, forming a shared welded portion 14 after melting and solidification.

[0102] Understandably, traditional processes typically require pre-welding (e.g., welding the sampling terminal to the electrode plate) followed by secondary welding (welding the electrode plate to the pole). This embodiment combines these two independent welding processes into one through the aforementioned stacked structure. The welding part 14 penetrates and connects the three components in one pass, achieving "one weld for multiple connections," simplifying the production process and improving production efficiency. Furthermore, this embodiment achieves connection through a single welding part 14, reducing the number of weld points, lowering the risk of multi-point welding failure, simplifying the welding structure, and improving the reliability of electrical connections.

[0103] The voltage sampling terminal 132 is located between the electrical connector 133 and the pole 121. That is, the electrical connector 133 presses the voltage sampling terminal 132 onto the pole 121, so that the voltage sampling terminal 132 is directly attached to the pole 121, which can improve the sampling stability and accuracy.

[0104] Since the electrical connector 133 is typically a metal conductive sheet (such as an aluminum foil), it obstructs the view when covering the voltage sampling terminal 132, making it difficult to directly observe from the top whether the voltage sampling terminal 132 is accurately aligned and placed on the terminal post 121. Therefore, this embodiment of the application provides a through hole 1331 in the electrical connector 133. This through hole 1331 refers to an opening structure that penetrates the electrical connector 133 along the first direction X. Through this through hole 1331, the position of the voltage sampling terminal 132 can be visually confirmed during assembly, determining whether it is correctly positioned on the top surface of the terminal post 121. If not, the position of the voltage sampling terminal 132 is adjusted to ensure it is correctly positioned on the terminal post 121, thereby avoiding poor contact or sampling failure due to misalignment, ensuring the reliability of the electrical connection, and improving the assembly yield of the battery device.

[0105] Optionally, the number of through holes 1331 can be one or more. The shape of the through holes 1331 can be circular, square, triangular, etc.

[0106] In some embodiments, refer to Figure 5 As shown, on the projection plane perpendicular to the first direction X, the orthographic projection of the through hole 1331 and the orthographic projection of the welding part 14 are offset from each other, that is, they do not overlap and do not interfere with each other.

[0107] The welding part 14 can be a laser weld point or an ultrasonic weld area, and phenomena such as molten metal spatter and material deformation occur around it. If the through hole 1331 and the welding part 14 coincide in the projection, not only will the edge of the through hole 1331 deform, the diameter shrink, or even close due to the welding heat effect, affecting the observation effect, but it will also weaken the structural strength of the welding part 14, resulting in unstable welding quality. Therefore, in this embodiment of the application, by staggering the through hole 1331 and the welding part 14 on the projection plane, the above-mentioned interference can be avoided, ensuring the stability of the welding process and the integrity of the function of the through hole 1331.

[0108] In some embodiments, refer to Figure 5 As shown, on a projection plane perpendicular to the first direction X, at least a portion of the orthographic projection of the electrical connector 133, at least a portion of the orthographic projection of the voltage sampling terminal 132, and at least a portion of the orthographic projection of the pole post 121 coincide, forming a common overlapping area, and at least a portion of the orthographic projection of the solder part 14 is located within the overlapping area.

[0109] This design ensures that the electrical connector 133, voltage sampling terminal 132, and pole 121 are in effective contact during the welding process, preventing a certain layer from being insufficiently welded due to misalignment. This ensures that the welding energy (laser beam energy) can accurately fall on the overlapping area of ​​the three and act on the contact interface, allowing the weld pool to penetrate the three layers of material. This enables a one-time integral connection, reducing the risk of incomplete welding, false welding, or poor contact, and effectively improving the reliability of the connection.

[0110] In some embodiments, the sampling assembly 13 further includes a temperature sampling terminal electrically connected to the sampling plate 131, and the temperature sampling terminal is snapped into the electrical connector 133.

[0111] Since the electrical connector 133 is connected to the terminal 121 of the battery cell 12, the temperature of the battery cell 12 can be transferred to the electrical connector 133. Therefore, by placing a temperature sampling terminal on the electrical connector 133, the temperature of the battery cell 12 can be collected. Furthermore, the temperature sampling terminal is snapped into the electrical connector 133. This snap-fit ​​design eliminates the welding process, improving assembly convenience and maintainability.

[0112] In some embodiments, the electrical connector 133 has a snap-fit ​​groove on the side facing the battery cell 12, and the temperature sampling terminal is connected to the snap-fit ​​groove.

[0113] The side of the electrical connector 133 facing the battery cell 12 refers to the back side of the electrical connector 133 facing the battery terminal 121. A snap-fit ​​groove is provided on this back side to accommodate and secure the temperature sampling terminal. This design is compact and facilitates assembly and maintenance. Furthermore, the back-side arrangement of this snap-fit ​​groove allows the temperature sampling terminal to directly contact or closely approach the surface of the battery cell 12, shortening the heat conduction path and thus improving the accuracy of temperature measurement.

[0114] In some embodiments, the battery cell 12 further includes a housing, the terminal post 121 is disposed on the housing, and the sampling assembly 13 further includes a thermal pad disposed between the temperature sampling terminal and the housing.

[0115] Optionally, the thermal pad can be adhered to the back side of the temperature sampling terminal facing the housing. Alternatively, the thermal pad can be adhered to the top of the housing facing the temperature sampling terminal.

[0116] Thermal pads can be made of thermally conductive flexible materials (such as silicone thermal pads) or thermally conductive metal materials (such as copper or aluminum pads). They can fill the gap between the temperature sampling terminal and the battery casing, reducing contact thermal resistance and enabling the temperature sampling terminal to monitor the actual temperature of the battery casing more accurately and quickly, thereby improving the accuracy of temperature signal acquisition. Furthermore, when thermal pads are made of thermally conductive flexible materials, they also provide cushioning and vibration damping, mitigating the rigid impact between the temperature sampling terminal and the battery casing under vehicle operating vibration conditions, thus improving the reliability of temperature sampling.

[0117] In some embodiments, refer to Figure 4 As shown, the battery device 100 also includes a battery cell management controller 15 disposed in the housing 11, and the sampling assembly 13 also includes a connector 134, which is used to connect the sampling board 131 and the battery cell management controller 15 respectively.

[0118] The battery cell management controller 15 typically refers to the slave control unit in the battery management system (BMS), which is used to monitor and manage the operating parameters such as voltage and temperature of each battery cell 12 in the battery cell assembly, and to perform battery equalization control, thereby ensuring the normal operation of the battery device 100.

[0119] Connector 134, also known as a connector, socket, or connector, is an electrical connector used to connect two active devices to transmit current or signals. Optionally, connector 134 can be connected to one end of the sampling board 131 along its length.

[0120] As an example, connector 134 can be a puncture connector. Of course, other types of connectors are also possible. This application does not impose any particular limitation on this.

[0121] This embodiment of the application uses connector 134 to achieve direct docking between sampling board 131 and battery cell management controller 15, eliminating the need for adapter harnesses, making the internal wiring of battery device 100 neater and saving space; in addition, connector 134 supports quick plugging and unplugging, reducing assembly complexity, thereby improving production efficiency and maintenance convenience.

[0122] Reference Figure 4 , Figure 6 and Figure 7 As shown, multiple battery cells 12 are arranged side by side along the second direction Y. The electrical connector 133 may include a first electrical connector 135 and a second electrical connector 136. The first electrical connector 135 is used to connect the positive terminal of one of two adjacent battery cells 12 and the negative terminal of the other, realizing the series connection of multiple battery cells 12. The second electrical connector 136 is used to connect the positive terminal or negative terminal of the battery cell 12 located at the end of the multiple battery cells 12, and is used to connect to external charging or electrical equipment to realize the input or output of electrical energy.

[0123] In some embodiments, refer to Figure 8As shown in the figure, the voltage sampling terminal 132 is not shown. The electrical connector 133 includes a first electrical connector 135, which includes a first connecting portion 1351, a second connecting portion 1352, and a bending portion 1353. The first connecting portion 1351 and the second connecting portion 1352 are respectively used for welding the terminals 121 of two adjacent battery cells 12 arranged side-by-side along the second direction Y. The bending portion 1353 connects the first connecting portion 1351 and the second connecting portion 1352. The welding portion 14 includes a first welding portion 141 and a second welding portion 142. 42, the first welded portion 141 is connected to the first connecting portion 1351, the voltage sampling terminal 132 and the terminal post 121 of a battery cell 12, and the second welded portion 142 is connected to the second connecting portion 1352 and the terminal post 121 of another battery cell 12; along the second direction Y, the first welded portion 141 is formed on the side of the first connecting portion 1351 away from the bend portion 1353, and / or, the second welded portion 142 is formed on the side of the second connecting portion 1352 away from the bend portion 1353.

[0124] The first electrical connector 135 can be an arched structure, including a first connecting portion 1351 for connecting the positive terminal of one of the two battery cells 12 and a second connecting portion 1352 for connecting the negative terminal of the other, as well as a bent portion 1353 connecting the two connecting portions. The bent portion 1353 is mainly used to provide structural bridging function and assembly adaptability, such as bridging the gap between the battery cell terminals 121 and avoiding other structural components inside the housing 11, facilitating assembly. Optionally, the cross-sectional shape of the bent portion 1353 can be arc-shaped, angled, etc.

[0125] The first welding part 141 penetrates along the first direction X through the first connecting part 1351 of the first electrical connector 135, the voltage sampling terminal 132, and the positive terminal of a battery cell 12, so as to connect the first connecting part 1351, the voltage sampling terminal 132, and the positive terminal of the first electrical connector 135 to each other through the same first welding part 141 to realize voltage signal acquisition; the second welding part 142 penetrates through the second connecting part 1352 of the first electrical connector 135 and the negative terminal of another battery cell 12, so as to connect the second connecting part 1352 and the negative terminal of the first electrical connector 135 to each other through the same second welding part 142 to realize electrical circuit conduction connection.

[0126] Understandably, due to the significant overhang of the curved portion 1353, it is prone to large vibration amplitudes during vehicle operation and transportation. If the welded portion is located near this point, it is susceptible to cracking due to vibration fatigue. Therefore, in this embodiment, the first welded portion 141 and the second welded portion 142 are respectively located on the side of the first connecting portion 1351 and the second connecting portion 1352 away from the curved portion 1353, that is, closer to the outer edge area of ​​the pole post 121 to which they are connected. The vibration amplitude at this location is relatively smaller, thereby reducing the risk of weld cracking and improving the reliability of the weld.

[0127] like Figure 7 As shown, in the terminals 121 of the two battery cells 12 connected by the first electrical connector 135, the voltage sampling terminal 132 is located in the outer edge region of the connected terminal 121 away from the other terminal 121.

[0128] In some embodiments, the temperature sampling terminal may be located on the side of the first connecting portion 1351 and / or the second connecting portion 1352 of the first electrical connector 135 away from the bending portion 1353 with large vibration amplitude, thereby improving the stability and reliability of the temperature sampling terminal.

[0129] In other embodiments, reference is made to Figure 9As shown in the figure, voltage sampling terminal 132 is not shown. Electrical connector 133 includes a first electrical connector 135, which includes a first connecting portion 1351, a second connecting portion 1352, and a connecting portion 1354. The first connecting portion 1351 includes a first main body portion 13511, and the second connecting portion 1352 includes a second main body portion 13521. The first main body portion 13511 and the second main body portion 13521 are respectively used for welding the terminals 121 of two adjacent battery cells 12 arranged side by side along the second direction Y. The connecting portion 1354 connects the first main body portion 13511 and the second main body portion 13521. The first connecting portion 1351 also includes a first cantilever portion 13512 connected to the first main body portion 13511. In the second direction Y, the first cantilever portion 13512 protrudes from the terminal 121 connected to the first main body portion 13511 in a direction away from the connecting portion 1354. The length of the connecting portion 1354 is greater than the length of the first cantilever portion 13512. Alternatively, the second connecting portion 1352 further includes a second cantilever portion 13522 connected to the second main body portion 13521. In the second direction Y, the second cantilever portion 13522 protrudes from the terminal post 121 connected to the second main body portion 13521 in a direction away from the connecting portion 1354. The length of the connecting portion 1354 is greater than the length of the second cantilever portion 13522. The welding portion 14 includes a first welding portion 141 and a second welding portion 142. The first welding portion 141 is connected to the first main body portion 13511, the voltage sampling terminal 132, and the terminal post 121 of a battery cell 12. The second welding portion 142 is connected to the second main body portion 13521 and the terminal post 121 of another battery cell 12. Along the second direction Y, the first welding portion 141 is formed on the side of the first main body portion 13511 away from the connecting portion 1354, and / or, the second welding portion 142 is formed on the side of the second main body portion 13521 away from the connecting portion 1354.

[0130] The first electrical connector 135 includes a first main body portion 13511 for connecting a first connecting portion 1351 to the positive terminal of one of the two battery cells 12, and a second main body portion 13521 for connecting a second connecting portion 1352 to the negative terminal of the other, as well as a connecting portion 1354 connecting the two main body portions. The length of the connecting portion 1354 is greater than the length of any cantilever portion of the first connecting portion 1351 and the second connecting portion 1352, facilitating the connection of adjacent battery cell terminals 121. Optionally, the cross-sectional shape of the connecting portion 1354 can be straight, arc-shaped, etc.

[0131] The first welding part 141 penetrates along the first direction X through the first main body portion 13511 of the first connecting part 1351, the voltage sampling terminal 132, and the positive terminal of a battery cell 12, so as to connect the first main body portion 13511, the voltage sampling terminal 132, and the positive terminal of the first electrical connector 135 through the same first welding part 141 to realize voltage signal acquisition; the second welding part 142 penetrates through the second main body portion 13521 of the second connecting part 1352 and the negative terminal of another battery cell 12, so as to connect the second main body portion 13521 and the negative terminal of the first electrical connector 135 through the same second welding part 142 to realize electrical circuit conduction connection.

[0132] Understandably, since the connecting portion 1354, as the central region bridging the two battery cells 12, is longer than the cantilever portion and lacks under-support (usually suspended), it is prone to significant vibration during vehicle operation or transportation. If the welded portion is located near this area, it is susceptible to cracking due to vibration fatigue. Therefore, in this embodiment, the first welded portion 141 is positioned on the first main body portion 13511 on the side away from the connecting portion 1354 (i.e., near the cantilever end but still within the area of ​​the main body covering the terminal post 121), and the second welded portion 142 is similarly positioned on the second main body portion 13521 on the side away from the high-amplitude connecting portion 1354. This arrangement reduces the risk of welded portion cracking and improves the fatigue resistance and connection stability of the weld.

[0133] In some embodiments, the temperature sampling terminal may be located on the first connecting portion 1351 and / or the second connecting portion 1352 of the first electrical connector 135 on the side away from the connecting portion 1354 with large vibration amplitude, thereby improving the installation stability and reliability of the temperature sampling terminal.

[0134] In other embodiments, reference is made to Figure 10As shown in the figure, the voltage sampling terminal 132 is not shown. The electrical connector 133 includes a first electrical connector 135, which includes a first connecting portion 1351, a second connecting portion 1352, and a deformation portion 1355. The first connecting portion 1351 and the second connecting portion 1352 are respectively used to weld the terminals 121 of two adjacent battery cells 12 arranged side-by-side along the second direction Y. The deformation portion 1355 is connected between the first connecting portion 1351 and the second connecting portion 1352 and is used to match the displacement of the battery cell 12 when it expands or contracts along the second direction Y. The welding portion 14 includes... A first welding portion 141 and a second welding portion 142 are connected to a first connecting portion 1351, a voltage sampling terminal 132, and a terminal post 121 of a battery cell 12. The second welding portion 142 is connected to a second connecting portion 1352 and a terminal post 121 of another battery cell 12. Along the second direction Y, the first welding portion 141 is formed on the side of the first connecting portion 1351 away from the deformed portion 1355, and / or the second welding portion 142 is formed on the side of the second connecting portion 1352 away from the deformed portion 1355.

[0135] The first electrical connector 135 includes a first connecting portion 1351 for connecting the positive terminal of one of the two battery cells 12 and a second connecting portion 1352 for connecting the negative terminal of the other, as well as a deformable portion 1355 connecting the two connecting portions. The deformable portion 1355 can be an elastic or plastically deformable structure (such as a spring sheet, corrugated section, or bent section), capable of absorbing or adapting to the relative displacement of the battery cell 12 when it expands or contracts along the second direction Y (typically the thickness direction of the battery cell 12). For example, when the battery cell 12 expands and shifts along the second direction Y, the deformable portion 1355 is stretched and deformed, thereby adapting to the displacement change of the battery cell 12, reducing the risk of connection failure of the first electrical connector 135, and improving connection reliability.

[0136] The first welding part 141 penetrates along the first direction X through the first connecting part 1351 of the first electrical connector 135, the voltage sampling terminal 132, and the positive terminal of a battery cell 12, so as to connect the first connecting part 1351, the voltage sampling terminal 132, and the positive terminal of the first electrical connector 135 to each other through the same first welding part 141 to realize voltage signal acquisition; the second welding part 142 penetrates through the second connecting part 1352 of the first electrical connector 135 and the negative terminal of another battery cell 12, so as to connect the second connecting part 1352 and the negative terminal of the first electrical connector 135 to each other through the same second welding part 142 to realize electrical circuit conduction.

[0137] Understandably, since the deformation portion 1355 undergoes local strain transmission during deformation, stress will be conducted to the connecting portions on both sides. If the weld portion is located close to the deformation portion, it is susceptible to stress and may crack. Therefore, in this embodiment, the first weld portion 141 is located on the side of the first connecting portion 1351 away from the deformation portion 1355, and the second weld portion 142 is similarly located on the side of the second connecting portion 1352 away from the deformation portion 1355, that is, closer to the outer edge region of the respective connected electrode post 121. This location is far from the high strain zone of the deformation portion 1355, in a region with relatively stable structure and small displacement amplitude, thereby reducing the stress level and cracking risk of the weld portion during the expansion or contraction deformation of the battery cell 12, and improving the reliability of the weld.

[0138] In some embodiments, the temperature sampling terminal may be disposed on the side away from the deformation portion 1355 on the first connection portion 1351 and / or the second connection portion 1352 of the first electrical connector 135, thereby improving the stability and reliability of the temperature sampling terminal.

[0139] In some embodiments, refer to Figure 6 , Figure 11 As shown in the figure, the voltage sampling terminal 132 is not shown. Multiple battery cells 12 are arranged side-by-side along the second direction Y. The battery assembly 100 also includes a mounting member 16 and an output electrode base 17 disposed within the housing 11. The mounting member 16 is located on the outer side of the battery cell 12 at the end of the multiple battery cells 12 along the second direction Y, and the output electrode base 17 is disposed on the mounting member 16. The electrical connector 133 includes a second electrical connector 136, which includes a third connecting portion 1361, a fourth connecting portion 1362, and a transition portion 1363. The third connecting portion 1361 includes a third main body portion 13611 and a third cantilever portion 13612. The third main body portion 13611 is used to weld the terminal post 121 of the battery cell 12 at the end of the multiple battery cells 12. In the direction Y, the third cantilever portion 13612 protrudes from the pole post 121 connected to the third main body portion 13611 in a direction away from the transition portion 1363, and the length of the transition portion 1363 is greater than the length of the third cantilever portion 13612; the fourth connecting portion 1362 is used to connect the output pole base 17, and the transition portion 1363 is connected between the third main body portion 13611 and the fourth connecting portion 1362; the welding portion 14 includes a third welding portion 143, which is connected to the pole post 121 of the third main body portion 13611, the voltage sampling terminal 132 and the end battery cell 12, and in the second direction Y, the third welding portion 143 is formed on the side of the third main body portion 13611 away from the transition portion 1363.

[0140] Mounting component 16 can be a mounting beam, mounting base, or other structure used to support the output electrode base 17. Mounting component 16 can be made of metal materials with a certain rigidity, such as steel or aluminum. The output electrode base 17 is used for the output connection of the battery cell 12. The output electrode base 17 can be made of insulating material to isolate the fourth connection portion 1362 of the metal second electrical connector 136 from the metal mounting component 16, thereby improving insulation performance.

[0141] The second electrical connector 136 includes a third main body portion 13611 for connecting the terminal post 121 (positive or negative terminal post) of the end battery cell 12, a fourth connecting portion 1362 for connecting the output terminal base 17, and a transition portion 1363 connecting the two connecting portions. The length of the transition portion 1363 is greater than the length of the third cantilever portion 13612 of the third connecting portion 1361, which facilitates the connection of the external output terminal base 17. Optionally, the cross-sectional shape of the transition portion 1363 can be a polygonal shape, an arc shape, etc.

[0142] The third welding part 143 penetrates along the first direction X through the third main body portion 13611 of the third connecting part 1361 of the second electrical connector 136, the voltage sampling terminal 132, and the pole 121, so as to connect the third main body portion 13611, the voltage sampling terminal 132, and the pole 121 of the second electrical connector 136 to each other through the same third welding part 143, thereby realizing voltage signal acquisition.

[0143] Understandably, since the length of the transition portion 1363 is greater than the length of the third cantilever portion 13612, forming a relatively long and suspended connection section, it is prone to large vibration amplitudes during vehicle operation and transportation. If the welded part is close to this location, it is prone to cracking due to vibration fatigue. Therefore, in this embodiment, the third welded part 143 is located on the side of the third connecting portion 1361 away from the transition portion 1363, that is, closer to the outer edge area of ​​the connected pole post 121. The vibration amplitude at this location is relatively smaller, thereby reducing the risk of welded part cracking and improving the reliability of the weld.

[0144] In some embodiments, refer to Figure 11 As shown, the fourth connecting portion 1362 of the second electrical connector 136 can be connected to the adapter 19 (such as an aluminum plate) via fasteners such as screws 18. The adapter 19 is used to connect to external power or charging equipment. The screws 18 can penetrate the stacked adapter 19, the fourth connecting portion 1362, and the output electrode base 17 to fix the three together.

[0145] like Figure 7 As shown, the voltage sampling terminal 132 connected to the second electrical connector 136 is located on the side of the connected pole 121 away from the fourth connector 1362.

[0146] In some embodiments, the temperature sampling terminal may be located on the side of the third connection portion 1361 of the second electrical connector 136 away from the transition portion 1363 with large vibration amplitude, thereby improving the stability and reliability of the temperature sampling terminal.

[0147] In some embodiments, refer to Figure 3 and Figure 4 As shown, the battery device 100 also includes an insulating plate 20 disposed within the housing 11. The sampling component 13 is disposed on top of the battery cell assembly, and the insulating plate 20 is disposed between the sampling component 13 and the battery cell assembly to improve the insulation performance between the sampling component 13 and the battery cell assembly. Furthermore, to ensure that the introduction of the insulating plate 20 does not affect the normal function of voltage and temperature sampling, through holes, clearance grooves, or other structures can be provided on the insulating plate 20 at the connection positions between the voltage sampling terminal 132 and the battery cell terminal 121, allowing the battery cell 12's terminal 121 to pass through the insulating plate 20 and connect to the voltage sampling terminal 132. Similarly, through holes, clearance grooves, or other structures are provided in the contact area between the temperature sampling terminal and the battery casing to ensure that the temperature sampling terminal (or its underlying thermal pad) can adhere to the surface of the battery casing.

[0148] Alternatively, the insulating board 20 can be made of materials such as PET (polyethylene terephthalate), PI (polyimide), and PBT (polybutylene terephthalate).

[0149] In some embodiments, refer to Figures 2 to 11As shown, this application provides a battery device, including: a housing 11, a plurality of battery cells 12, a sampling assembly 13, a first welding part 141, a second welding part 142 and a third welding part 143. Multiple battery cells 12 are arranged side-by-side along the second direction Y within a housing 11. Each battery cell 12 includes a positive terminal and a negative terminal. A sampling assembly 13 is located within the housing 11 and on top of the multiple battery cells 12. The sampling assembly 13 includes a sampling plate 131, multiple voltage sampling terminals 132, a first electrical connector 135, and a second electrical connector 136. The voltage sampling terminals 132 are electrically connected to the sampling plate 131. The first electrical connector 135 includes a first connecting portion 1351 for connecting the positive terminal of one of two adjacent battery cells 12 and a second connecting portion 1352 for connecting the negative terminal of the other. The first connecting portion 1351 and the voltage sampling terminals 132 are stacked on the positive terminal along the first direction X. A first welding portion 141 passes through the first connecting portion 1351, the voltage sampling terminals 132, and the positive terminal along the first direction X to connect the first connecting portion 1351, the voltage sampling terminals 132, and the positive terminal. The second connection part 1352 is disposed on the negative terminal post and is connected to each other through the first welding part 141. The second connection part 1352 and the negative terminal post are connected to each other through the second welding part 142 along the first direction X. The second electrical connector 136 includes a third connection part 1361 for connecting the terminal post 121 (positive terminal post or negative terminal post) of the end battery cell 12 and a fourth connection part 1362 for connecting the output terminal base 17. The third connection part 1361 and the voltage sampling terminal 132 are stacked on one terminal post 121 of the end battery cell 12 along the first direction X. The third connection part 1361, the voltage sampling terminal 132 and the terminal post 121 are connected to each other through the third welding part 143 along the first direction X.

[0150] Furthermore, the first welding portion 141 and the second welding portion 142 are respectively provided on both sides of the first electrical connector 135 along the second direction Y, and the third welding portion 143 is provided on the side away from the fourth connecting portion 1362 on the third connecting portion 1361 of the second electrical connector 136.

[0151] In addition, through holes 1331 may be provided on the first connecting portion 1351 of the first electrical connector 135 and the third connecting portion 1361 of the second electrical connector 136.

[0152] In some embodiments, this application also provides an electrical device, including: a battery device 100 of any of the above embodiments, the battery device 100 being used to provide electrical energy.

[0153] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0154] The above are merely preferred embodiments of this application and are not intended to limit the embodiments of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the embodiments of this application should be included within the protection scope of the embodiments of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. 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: Box; A battery cell and a sampling assembly are disposed inside the housing. The battery cell includes a terminal post, and the sampling assembly includes a sampling plate, a voltage sampling terminal, and an electrical connector. The voltage sampling terminal is electrically connected to the sampling plate, and the electrical connector and the voltage sampling terminal are stacked on the terminal post along a first direction. A welding section is provided, which extends through the stacked electrical connector, voltage sampling terminal, and electrode post along the first direction to connect the electrical connector, voltage sampling terminal, and electrode post to each other via the same welding section. The voltage sampling terminal is located between the electrical connector and the electrode post. The electrical connector is provided with a through hole, which is used to observe the positional relationship between the voltage sampling terminal and the electrode post. On a projection plane perpendicular to the first direction, at least a portion of the orthographic projection of the through hole coincides with at least a portion of the orthographic projection of the voltage sampling terminal and at least a portion of the orthographic projection of the electrode post.

2. The battery device according to claim 1, characterized in that, On a projection plane perpendicular to the first direction, the orthographic projection of the through hole is offset from the orthographic projection of the welded part.

3. The battery device according to claim 1, characterized in that, On a projection plane perpendicular to the first direction, at least a portion of the orthographic projection of the electrical connector, at least a portion of the orthographic projection of the voltage sampling terminal, and at least a portion of the orthographic projection of the pole coincide to form an overlapping region, and at least a portion of the orthographic projection of the welded part is located within the overlapping region.

4. The battery device according to any one of claims 1 to 3, characterized in that, The electrical connector includes a first electrical connector, which includes a first connecting portion, a second connecting portion, and a bent portion. The first connecting portion and the second connecting portion are respectively used to weld the electrode posts of two adjacent battery cells arranged side by side along a second direction. The bent portion is connected between the first connecting portion and the second connecting portion. The second direction is perpendicular to the first direction. The welding part includes a first welding part and a second welding part. The first welding part is connected to the first connecting part, the voltage sampling terminal and the terminal of one of the battery cells, and the second welding part is connected to the second connecting part and the terminal of another battery cell. Along the second direction, the first weld portion is formed on the side of the first connecting portion away from the bend, and / or, the second weld portion is formed on the side of the second connecting portion away from the bend.

5. The battery device according to any one of claims 1 to 3, characterized in that, The electrical connector includes a first electrical connector, which includes a first connecting portion, a second connecting portion, and a connecting portion. The first connecting portion includes a first main body portion, and the second connecting portion includes a second main body portion. The first main body portion and the second main body portion are respectively used to weld the electrode posts of two adjacent battery cells arranged side by side along a second direction. The connecting portion is connected between the first main body portion and the second main body portion. The second direction is perpendicular to the first direction. The first connecting portion further includes a first cantilever portion connected to the first main body portion. In the second direction, the first cantilever portion protrudes from the pole connected to the first main body portion in a direction away from the connecting portion, and the length of the connecting portion is greater than the length of the first cantilever portion; and / or, the second connecting portion further includes a second cantilever portion connected to the second main body portion. In the second direction, the second cantilever portion protrudes from the pole connected to the second main body portion in a direction away from the connecting portion, and the length of the connecting portion is greater than the length of the second cantilever portion; The welding portion includes a first welding portion and a second welding portion. The first welding portion is connected to the first main body portion, the voltage sampling terminal, and the terminal post of one of the battery cells. The second welding portion is connected to the second main body portion and the terminal post of another battery cell. Along the second direction, the first weld portion is formed on the side of the first main body portion away from the connecting portion, and / or, the second weld portion is formed on the side of the second main body portion away from the connecting portion.

6. The battery device according to any one of claims 1 to 3, characterized in that, The electrical connector includes a first electrical connector, which includes a first connecting portion, a second connecting portion, and a deformation portion. The first connecting portion and the second connecting portion are respectively used to weld the electrode posts of two adjacent battery cells arranged side by side along the second direction. The deformation portion is connected between the first connecting portion and the second connecting portion and is used to match the displacement of the battery cells when they expand or contract along the second direction. The second direction is perpendicular to the first direction. The welding part includes a first welding part and a second welding part. The first welding part is connected to the first connecting part, the voltage sampling terminal and the terminal of one of the battery cells, and the second welding part is connected to the second connecting part and the terminal of another battery cell. Along the second direction, the first weld portion is formed on the side of the first connecting portion away from the deformed portion, and / or, the second weld portion is formed on the side of the second connecting portion away from the deformed portion.

7. The battery device according to any one of claims 1 to 3, characterized in that, Multiple battery cells are arranged side by side along a second direction, which is perpendicular to the first direction; The battery device further includes a mounting component and an output electrode base disposed within the housing. The mounting component is disposed on the outside of the battery cell located at the end of the plurality of battery cells, and the output electrode base is disposed on the mounting component. The electrical connector includes a second electrical connector, which includes a third connecting portion, a fourth connecting portion, and a transition portion. The third connecting portion includes a third main body portion and a third cantilever portion. The third main body portion is used to weld the terminal post of the battery cell located at the end of the plurality of battery cells. In the second direction, the third cantilever portion protrudes from the terminal post connected to the third main body portion in a direction away from the transition portion. The length of the transition portion is greater than the length of the third cantilever portion. The fourth connecting portion is used to connect the output terminal base, and the transition portion connects the third main body portion and the fourth connecting portion. The welding portion includes a third welding portion, which is connected to the third main body portion, the voltage sampling terminal and the terminal post of the battery cell at the end, and the third welding portion is formed on the side of the third main body portion away from the transition portion along the second direction.

8. The battery device according to any one of claims 1 to 3, characterized in that, The sampling assembly also includes a temperature sampling terminal electrically connected to the sampling plate, and the temperature sampling terminal is snapped into the electrical connector.

9. The battery device according to claim 8, characterized in that, The electrical connector has a snap-fit ​​groove on the side facing the battery cell, and the temperature sampling terminal is connected to the snap-fit ​​groove.

10. The battery device according to claim 8, characterized in that, The battery cell also includes a housing, the terminal is disposed on the housing, and the sampling assembly also includes a thermal pad, which is disposed between the temperature sampling terminal and the housing.

11. The battery device according to any one of claims 1 to 3, characterized in that, The battery device also includes a battery cell management controller disposed within the housing, and the sampling component further includes a connector for connecting the sampling board and the battery cell management controller respectively.

12. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1 to 11, wherein the battery device is used to provide electrical energy.

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