Battery device and electric device

Abstract

The utility model relates to a battery device and a power utilization device. The battery device comprises a connecting piece and a plurality of battery cells. Each battery monomer comprises an electrode terminal, the electrode terminal is constructed as a metal piece made of a single material, a connecting piece is arranged between two adjacent battery monomers, one end of the connecting piece is connected with the electrode terminal of one of the two adjacent battery monomers, and the other end of the connecting piece is connected with the electrode terminal of the other of the two adjacent battery monomers. According to the battery device provided by the embodiment of the invention, the electrode terminal is prepared from a single material, a riveting block can be omitted, the electrode terminal and the connecting piece can be directly connected together, and the space occupied by the whole electrode terminal on the battery monomer is reduced, so that the volume of the battery monomer is reduced, the energy density of the battery monomer is improved, and the service life of the battery monomer is prolonged. And the energy density of the battery device is further improved.

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] In the field of batteries, energy density is one of the important indicators for measuring battery performance. To improve the energy density of batteries, it is necessary to reduce the weight at the cell level and module level. Utility Model Content

[0003] In view of the above problems, this application provides a battery device and an electrical device that can reduce structural weight and increase energy density while maintaining the original function.

[0004] In a first aspect, this application provides a battery device including a connector and a plurality of battery cells. Each battery cell includes an electrode terminal, which is constructed as a single-material metal component. A connector is provided between two adjacent battery cells, one end of which is connected to the electrode terminal of one of the two adjacent battery cells, and the other end of which is connected to the electrode terminal of the other of the two adjacent battery cells.

[0005] In the technical solution of this application embodiment, the electrode terminal is made of a single material, which eliminates the need for rivet blocks and allows the electrode terminal and connector to be directly connected together. This reduces the space occupied by the entire electrode terminal on the battery cell, thereby reducing the volume of the battery cell, increasing the energy density of the battery cell, and thus increasing the energy density of the battery device.

[0006] In some embodiments, the electrode terminals and the connectors are detachably connected.

[0007] The above settings enrich the connection methods of electrode terminals and connectors, improve installation flexibility, and make it easier for users to adopt the corresponding assembly method according to the actual situation.

[0008] In some embodiments, the battery cell further includes an electrode assembly and a housing assembly, the electrode assembly being located within the housing assembly, the housing assembly including a first wall on which electrode terminals are provided.

[0009] This design improves the structure of the electrode terminals, allowing them to be directly assembled with the first wall. This simplifies the structure of the electrode terminals, reduces the space they occupy on the surface of the first wall, and lowers the height at which the electrode terminals protrude relative to the first wall, thereby increasing the energy density.

[0010] In some embodiments, a mounting position is provided on the first wall, the mounting position is covered by an insulating member, an electrode terminal is disposed through the mounting position and clamped to the first wall, and the insulating member is located between the first wall and the electrode terminal.

[0011] In this way, the insulating component can seal and insulate the electrode terminals and the first wall, thereby improving the sealing effect between the two, reducing the probability that external moisture, dust, etc. will enter the battery cell and affect the internal environment of the battery cell, improving the safety of the battery cell and maintaining the pressure balance inside the battery cell.

[0012] In some embodiments, the electrode terminal includes a first segment, a second segment, and a third segment connected in sequence. Along the thickness direction of the first wall, the first segment and the third segment are located on both sides of the first wall, the first segment is connected to the connector, and the second segment is electrically connected to the electrode assembly.

[0013] Along the circumference of the second segment, the first and third segments protrude relative to the second segment, and the first, second, and third segments together clamp the first wall.

[0014] In this way, the parts of the electrode terminal located in different directions can contact the first wall, improving the connection stability between the electrode terminal and the first wall.

[0015] In some embodiments, the first segment includes a first end, and the distance between the outermost edge of the first segment and the edge of the corresponding side of the first wall along the length direction of the first wall is a, where 10mm≤a≤25mm;

[0016] Along the width direction of the first wall, the distance between the outermost edge of the first segment and the edge of the corresponding side of the first wall is b, where b ≥ 4 mm.

[0017] In this way, by limiting the size of a and b, the space occupied by the electrode terminal on the side of the connector can be minimized without affecting the installation stability and current conduction effect of the electrode terminal, so as to minimize the size of the first wall, thereby reducing the size of the battery cell and increasing the energy density.

[0018] In some embodiments, the insulating member further includes an upper plastic layer disposed between the first segment and the first wall, and covering a portion of the first segment.

[0019] With this configuration, the upper plastic can cover the surface of the first section facing the first wall to seal and insulate between the first section and the first wall, thereby reducing electrolyte leakage inside the casing and the impact of external factors (such as external moisture and dust) on the inside of the battery cell, improving the safety of the battery cell and maintaining the pressure balance inside the battery cell.

[0020] In some embodiments, a through hole and a groove are provided on the first wall. The through hole is configured as a mounting position, the groove communicates with the through hole and is disposed around the through hole, and the second section is located inside the through hole. The groove is provided with upper plastic.

[0021] This design allows the groove to confine the upper plastic, reducing the probability of the upper plastic moving relative to the first wall, thus improving the connection stability between the first segment, the upper plastic, and the first wall, as well as the sealing effect of the battery cell.

[0022] In some embodiments, along the thickness direction, the orthographic projection of the first segment onto the first wall falls within the groove, and a portion of the plastic protrudes from the groove.

[0023] With this design, the upper plastic can protrude relative to the groove, thereby covering the first section as much as possible and improving the sealing effect between the first section and the first wall.

[0024] In some embodiments, the insulating element further includes a lower plastic material disposed within the through-hole and surrounding the second segment.

[0025] This design further improves the sealing effect between the first wall and the electrode terminals, reduces electrolyte leakage inside the casing and the impact of external rings (such as external moisture and dust) on the inside of the battery cell, improves the safety of the battery cell, and maintains the pressure balance inside the battery cell.

[0026] Secondly, this application provides an electrical device that includes the battery device described in the above embodiments.

[0027] 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

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0030] Figure 2 This is an exploded view of a battery device according to one or more embodiments.

[0031] Figure 3 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0032] Figure 4 This is a schematic diagram of a structure in which multiple battery cells are connected by connectors according to one or more embodiments.

[0033] Figure 5 This is a cross-sectional view of the end cap of a battery cell according to one or more embodiments.

[0034] Figure 6 for Figure 4 Enlarged view of point A in the middle.

[0035] Figure 7 This is a top view of the end cap of a battery cell according to one or more embodiments.

[0036] The reference numerals in the detailed embodiments are as follows:

[0037] 1000, vehicles;

[0038] 100. Battery assembly; 200. Controller; 300. Motor;

[0039] 10. Box body; 11. First part; 12. Second part;

[0040] 20. Battery cell; 21. Electrode assembly; 22. Housing assembly; 221. First wall; 222. Housing; 23. Electrode terminal; 231. First section; 232. Second section; 233. Third section; 24. Insulating component; 241. Upper plastic; 242. Lower plastic; 30. Connector; X, thickness direction; Y, length direction; Z, width direction. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] In the description of the embodiments of this application, the technical terms "first," "second," etc., 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.

[0044] 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.

[0045] In the description of the embodiments of this application, the term "and / or" merely describes 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, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In the description of the embodiments of this application, if any, 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).

[0047] In the description of the embodiments of this application, if any technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," or "circumferential" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, and does 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, it should not be construed as a limitation on the embodiments of this application.

[0048] 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0049] In the design and manufacturing of battery cells, in order to improve energy density, it is necessary to optimize the structure of the battery cells. For example, the structure of the end caps can be simplified and optimized to reduce the weight of the structure while meeting the basic functions, thereby improving the energy density of the battery in subsequent designs.

[0050] Based on the above considerations, in order to solve the technical problem of low energy density of battery cells, this application provides a battery cell that eliminates the rivet block on the end cover and directly connects the electrode terminals and connectors. This eliminates the need to reserve a lot of space for installing the connectors, reduces the space occupied by the electrode terminals on the end cover, and improves the energy density of the battery cell.

[0051] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and battery devices disclosed in this application.

[0052] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, energy storage products, 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, and spacecraft, and energy storage products can include energy storage stations, etc.

[0053] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0054] 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. 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, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0055] 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.

[0056] Please refer to Figure 2 , Figure 2This is an exploded view 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 accommodating the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0057] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, 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 consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0058] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0059] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an electrode assembly 21, a housing assembly 22, and other functional components.

[0060] The outer casing assembly 22 includes an end cap and a housing 222. The end cap is a component that closes onto the opening of the housing 222 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap can be adapted to the shape of the housing 222 to fit it. The end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that it is less prone to deformation under pressure and impact, allowing the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on the end cap. The electrode terminals can be used to electrically connect to the electrode assembly 21 for outputting or inputting electrical energy into the battery cell 20. In some embodiments, the end cap can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0061] The housing 222 is a component used to cooperate with the end cap to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 21, electrolyte, and other components. The housing 222 and the end cap can be independent components. An opening can be provided on the housing 222, and the end cap closes the opening to form the internal environment of the battery cell 20. Alternatively, the end cap and housing 222 can be integrated. Specifically, the end cap and housing 222 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 222, the end cap closes the housing 222. The housing 222 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 222 can be determined according to the specific shape and size of the electrode assembly 21. The material of the housing 222 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0062] Electrode assembly 21 is the component in the battery cell 20 where electrochemical reactions occur. The casing 222 may contain one or more electrode assemblies 21. Electrode assembly 21 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0063] Please see Figure 3 and Figure 4This application provides a battery device 100 in some embodiments, which includes a connector 30 and a plurality of battery cells 20. Each battery cell 20 includes an electrode terminal 23, which is constructed as a single metal component. A connector 30 is provided between two adjacent battery cells 20, one end of which is connected to the electrode terminal 23 of one of the two adjacent battery cells 20, and the other end of which is connected to the electrode terminal 23 of the other of the two adjacent battery cells 20.

[0064] The connector 30 is constructed as a metal part and can be made of metal materials such as copper or aluminum. The connector 30 is used to electrically connect the battery cells 20 in the battery pack. The electrode terminals 23 can be made of pure copper or pure aluminum. For example, the negatively charged electrode terminals 23 are made of pure copper, and the positively charged electrode terminals are made of pure aluminum.

[0065] For example, such as Figure 3 and Figure 4 As shown, the battery device 100 includes two battery cells 20, all of which are arranged in the same direction. Each battery cell 20 has an electrode terminal 23. A connector 30 is provided between two adjacent battery cells 20. One end of the connector 30 is electrically connected to the electrode terminal 23 of one of the battery cells 20, and the other end of the connector 30 is electrically connected to the electrode terminal 23 of the other battery cell 20, thereby forming a battery module.

[0066] When connecting the connector 30 and the electrode terminal 23 together, it is generally necessary to reserve a certain installation space for the connector 30 on the surface where the electrode terminal 23 is located, so as to set up a riveting block to connect the electrode terminal 23 and the connector 30 together. However, in this embodiment, the electrode terminal 23 is made of a single material, which eliminates the need for the riveting block. The electrode terminal 23 and the connector 30 can be directly connected together, reducing the space occupied by the entire electrode terminal 23 on the battery cell 20, thereby reducing the volume of the battery cell 20, increasing the energy density of the battery cell 20, and thus increasing the energy density of the battery device 100.

[0067] In some embodiments, the electrode terminal 23 and the connector 30 are detachably connected.

[0068] For example, conductive adhesive can be used to connect the electrode terminal 23 and the connector 30, or the connection part of the electrode terminal 23 and the connector 30 can be constructed as a mortise and tenon structure to achieve the connection between the two.

[0069] The above settings enrich the connection methods between electrode terminal 23 and connector 30, improve installation flexibility, and make it easier for users to adopt the corresponding assembly method according to the actual situation.

[0070] In some embodiments, such as Figure 3 As shown, the battery cell 20 also includes an electrode assembly 21 and a housing assembly 22. The electrode assembly 21 is located inside the housing assembly 22. The housing assembly 22 includes a first wall 221, on which electrode terminals 23 are provided.

[0071] For example, the housing assembly 22 includes an end cap and a housing 222, which together cover to form a receiving space, in which an electrode assembly 21 is placed, and the end cap is configured as a first wall 221 on which electrode terminals 23 are provided.

[0072] During actual assembly, some electrode terminals 23 are located within the first wall 221, with both ends of the electrode terminals 23 protruding relative to the first wall 221. Along the thickness direction X of the first wall 221, both ends of the electrode terminals 23 abut against the two side walls of the first wall 221, thus engaging the electrode terminals 23 with the first wall 221 and installing them. Subsequently, one end of the electrode terminal 23 is electrically connected to the electrode assembly 21, and the other end is connected to an external terminal to supply power to the corresponding product.

[0073] For example, in one embodiment, when the rivet block is removed, the height by which the electrode terminal 23 protrudes relative to the first wall 221 is the distance between the end face of the electrode terminal 23 away from the first wall 221 and the first wall 221, which can be 1.5mm. When the rivet block is provided, the height by which the electrode terminal 23 protrudes relative to the first wall 221 is greater than the height by which the rivet block protrudes relative to the first wall 221 in the previous embodiment. In this case, the actual height by which the electrode terminal 23 protrudes relative to the first wall 221 is 2.5mm to 3.5mm. Therefore, when the rivet block is removed, the height by which the electrode terminal 23 protrudes relative to the first wall 221 is less than the height by which the electrode terminal 23 protrudes relative to the first wall 221 when the rivet block is provided.

[0074] Therefore, compared to using laser welding to weld the rivet block and connector 30 together, which not only requires a certain thickness for the rivet block itself, but also requires reserving a certain space on the surface of the first wall 221 as welding space, this embodiment eliminates the use of a rivet block to connect the electrode terminal 23 and the first wall 221. Instead, it improves the structure of the electrode terminal 23, allowing it to be directly assembled with the first wall 221. This simplifies the structure of the electrode terminal 23, reduces the space occupied by the electrode terminal 23 on the surface of the first wall 221, and reduces the height of the electrode terminal 23 protruding relative to the first wall 221, thereby increasing the energy density.

[0075] Furthermore, in some embodiments, the first wall 221 is provided with a mounting position, the mounting position is covered by an insulating member 24, the electrode terminal 23 passes through the mounting position and is clamped in the first wall 221, and the insulating member 24 is located between the first wall 221 and the electrode terminal 23.

[0076] The insulating component 24 can be made of polypropylene, polyamide, polyphenylene sulfide, and polybutylene terephthalate, etc. For example, a channel is provided on the first wall 221, through which the power supply terminal passes. The wall of the channel is provided with the insulating component 24, which can seal and insulate the electrode terminal and the first wall 221, thereby improving the sealing effect between the two, reducing the probability that external moisture, dust, etc. will enter the battery cell 20 and affect the internal environment of the battery cell 20, thus improving the safety of the battery cell 20 and maintaining the pressure balance inside the battery cell 20.

[0077] like Figure 5 and Figure 6 As shown, in some embodiments, the electrode terminal 23 includes a first segment 231, a second segment 232, and a third segment 233 connected in sequence. Along the thickness direction X of the first wall 221, the first segment 231 and the third segment 233 are located on opposite sides of the first wall 221. The first segment 231 is connected to the connector 30, and the second segment 232 is electrically connected to the electrode assembly 21. Along the circumferential direction of the second segment 232, the first segment 231 and the third segment 233 protrude relative to the second segment 232, and the first segment 231, the second segment 232, and the third segment 233 together clamp the first wall 221.

[0078] For example, after the electrode terminal 23 is assembled into the first wall 221, the second segment 232 of the electrode terminal 23 is located inside the first wall 221, and the first segment 231 and the third segment 233 of the electrode terminal 23 are located outside the first wall 221. The clamping position formed by the first segment 231, the second segment 232 and the third segment 233 of the electrode terminal 23 is constructed as an annular groove, which can hold part of the first wall 221. The cross-sectional shape of the electrode terminal 23 is "I".

[0079] In this way, the portions of the electrode terminal 23 located in different directions can contact the first wall 221, thereby improving the connection stability between the electrode terminal 23 and the first wall 221.

[0080] Please see Figure 7 In some embodiments, along the length direction Y of the first wall 221, the distance between the outermost edge of the first segment 231 and the edge of the corresponding side of the first wall 221 is a, 10mm≤a≤25mm; along the width direction Z of the first wall 221, the distance between the outermost edge of the first segment 231 and the edge of the corresponding side of the first wall 221 is b, b≥4mm.

[0081] Please continue reading. Figure 7 Two electrode terminals 23 are provided on the first wall 221 (i.e., the first wall 221), and the two electrode terminals 23 are distributed at intervals along the length direction Y of the first wall 221. One electrode terminal 23 is constructed to be a positively charged electrode terminal 23, and the other is constructed to be a negatively charged electrode terminal 23. The negatively charged electrode terminal 23 is made of pure copper, and the positively charged electrode terminal 23 is made of pure aluminum.

[0082] Taking the negatively charged electrode terminal 23 as an example, assume that the orthographic projection of the electrode terminal 23 on the first wall 221 is a circle, and the circle has a first end and a second end. The first end is a portion located near the edge of the first wall 221 along the length Y direction of the first wall 221, and the distance between the first end and the edge is 'a'. The specific value of 'a' can be 10mm, 15mm, 18mm, 25mm, or any value between two adjacent values. In actual installation, it is recommended that 'a' be set between 16mm and 25mm to obtain better results.

[0083] The second end is a portion located near the edge of the first wall 221 along the width direction Z. The distance between the first end and this edge is b, and the specific value of b can be 4mm, 6mm, 7mm, etc. In actual installation, it is necessary to ensure that the value of b is not too large in order to obtain a battery cell 20 with the smallest possible size.

[0084] The area enclosed by the first end, the second end, and the corresponding edge of the first wall 221 is used to install the connector 30. That is, the area of ​​the rectangle formed by the side lengths a and b is the installation size of the connector 30.

[0085] By limiting the sizes of a and b, the space occupied by the electrode terminal 23 on the side where the connector 30 is located can be minimized without affecting the installation stability and current conduction effect of the electrode terminal 23. This minimizes the size of the first wall 221, thereby reducing the size of the battery cell 20 and increasing the energy density.

[0086] like Figure 6 As shown, in some embodiments, the insulating member 24 further includes an upper plastic 241 disposed between the first segment 231 and the first wall 221, and covering part of the first segment 231.

[0087] Plastic 241 is generally made of polypropylene, polyamide, polyphenylene sulfide and polybutylene terephthalate, etc., and has properties such as high temperature resistance, corrosion resistance, insulation, sealing and dimensional stability.

[0088] With this configuration, the upper plastic 241 can cover the surface of the first section 231 facing the first wall 221 to seal and insulate between the first section 231 and the first wall 221, thereby reducing electrolyte leakage in the housing 222 and the impact of external rings (such as external moisture and dust) on the inside of the battery cell 20, improving the safety of the battery cell 20 and maintaining the pressure balance inside the battery cell 20.

[0089] Specifically, such as Figure 6 As shown, in some embodiments, the first wall 221 has a through hole (not shown) and a groove (not shown). The through hole is configured as a mounting position, the groove communicates with the through hole and is arranged around the through hole, the second segment 232 is located inside the through hole, and the groove is provided with upper plastic 241.

[0090] For example, the surface of the first wall 221 for mounting the connector 30 is provided with a groove and a through hole penetrating the first wall 221, the groove being arranged around the through hole. The second segment 232 of the electrode terminal 23 is located inside the through hole, and the first segment 231 is located outside the through hole and on the same side as the groove. An upper plastic 241 is provided inside the groove to cover the surface of the first segment 231 facing the groove.

[0091] With this design, the groove can limit the upper plastic 241, reduce the probability of the upper plastic 241 moving relative to the first wall 221, improve the connection stability between the first segment 231, the upper plastic 241 and the first wall 221, and improve the sealing effect of the battery cell 20.

[0092] More specifically, in some embodiments, along the thickness direction X, the orthographic projection of the first segment 231 onto the first wall 221 falls within the groove, and a portion of the upper plastic 241 protrudes from the groove.

[0093] For example, in Figure 6 In the example shown, the orthographic projection of the first segment 231 onto the first wall 221 is circular, and its projected area is smaller than the projected area of ​​the groove onto the first wall 221. When the first segment 231 and the upper plastic 241 are installed in the groove, because the size of the groove is larger than the size of the first segment 231, the gap between the first segment 231 and the groove can be filled with the upper plastic 241. The upper plastic 241 can protrude relative to the groove, thereby covering the first segment 231 as much as possible to improve the sealing effect between the first segment 231 and the first wall 221.

[0094] Furthermore, such as Figure 6 As shown, in some embodiments, the insulating member 24 further includes a lower plastic 242 disposed within the through hole and surrounding the second segment 232.

[0095] The lower plastic 242 is generally made of polypropylene, polyamide, polyphenylene sulfide, and polybutylene terephthalate, etc., to possess properties such as high temperature resistance, corrosion resistance, insulation, sealing performance, and dimensional stability. The lower plastic 242 can be constructed in a ring shape to be sealed between the inner wall of the through hole and the second section 232.

[0096] This configuration can further improve the sealing effect between the first wall 221 and the electrode terminal 23, reduce electrolyte leakage in the housing 222 and the impact of external rings (such as external moisture and dust) on the inside of the battery cell 20, improve the safety of the battery cell 20, and maintain the pressure balance inside the battery cell 20.

[0097] In addition, this application also provides an electrical device that includes the battery device 100 in the above embodiments.

[0098] The electrical device can obtain power from the battery device 100, and the battery device 100 of the present application embodiment has a high energy density, which can provide sufficient power for the electrical device.

[0099] In a specific embodiment, such as Figure 3 and Figure 4 As shown, one embodiment of this application provides a battery device 100, which includes a connector 30 and a plurality of battery cells 20. Each battery cell 20 includes an electrode terminal 23, an electrode assembly 21, and a housing assembly 22. The housing assembly 22 includes a first wall 221 and a shell 222, which together cover to form a receiving space, in which the electrode assembly 21 is placed. The first wall 221 is provided with the electrode terminal 23. The electrode terminal 23 is constructed as a single-material metal part. A connector 30 is provided between two adjacent battery cells 20. One end of the connector 30 is connected to the electrode terminal 23 of one of the two adjacent battery cells 20, and the other end of the connector 30 is connected to the electrode terminal 23 of the other two adjacent battery cells 20.

[0100] When the rivet block is removed, the height by which the electrode terminal 23 protrudes relative to the first wall 221 is the distance between the end face of the electrode terminal 23 away from the first wall 221 and the first wall 221. When the rivet block is installed, the height by which the electrode terminal 23 protrudes relative to the first wall 221 is greater than the height by which the rivet block protrudes relative to the first wall 221 in the previous embodiment. Therefore, when the rivet block is removed, the height by which the electrode terminal 23 protrudes relative to the first wall 221 is less than the height by which the electrode terminal 23 protrudes relative to the first wall 221 when the rivet block is installed.

[0101] Therefore, compared to using laser welding to weld the rivet block and connector 30 together, not only is there a certain requirement for the thickness of the rivet block itself, but also a certain space needs to be reserved on the surface of the first wall 221 as welding space. The embodiment of this application eliminates the use of rivet blocks to connect the electrode terminal 23 and the first wall 221 together. Instead, the structure of the electrode terminal 23 is improved so that the electrode terminal 23 can be directly assembled with the first wall 221. This simplifies the structure of the electrode terminal 23, reduces the space occupied by the electrode terminal 23 on the surface of the first wall 221, and reduces the height of the electrode terminal 23 protruding from the first wall 221, thereby improving the energy density.

[0102] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery device, characterized in that, include: Connectors; Multiple battery cells, each battery cell including an electrode terminal, the electrode terminal being constructed of a single metal material, a connector being provided between two adjacent battery cells, one end of the connector being connected to the electrode terminal of one of the two adjacent battery cells, and the other end of the connector being connected to the electrode terminal of the other of the two adjacent battery cells.

2. The battery device according to claim 1, characterized in that, The electrode terminals and the connector are detachably connected.

3. The battery device according to claim 1, characterized in that, The battery cell also includes an electrode assembly and a housing assembly. The electrode assembly is located inside the housing assembly, and the housing assembly includes a first wall on which the electrode terminals are disposed.

4. The battery device according to claim 3, characterized in that, The first wall has a mounting position covered by an insulating element. The electrode terminal passes through the mounting position and is clamped to the first wall. The insulating element is located between the first wall and the electrode terminal.

5. The battery device according to claim 4, characterized in that, The electrode terminal includes a first segment, a second segment, and a third segment connected in sequence. Along the thickness direction of the first wall, the first segment and the third segment are located on both sides of the first wall. The first segment is connected to the connector, and the second segment is electrically connected to the electrode assembly. Along the circumference of the second segment, the first segment and the third segment protrude relative to the second segment, and the first segment, the second segment and the third segment together clamp the first wall.

6. The battery device according to claim 5, characterized in that, Along the length of the first wall, the distance between the outermost edge of the first segment and the edge of the corresponding side of the first wall is a, 10mm≤a≤25mm; Along the width direction of the first wall, the distance between the outermost edge of the first segment and the edge of the corresponding side of the first wall is b, where b ≥ 4 mm.

7. The battery device according to claim 5, characterized in that, The insulating component also includes an upper plastic layer, which is disposed between the first segment and the first wall and partially wraps around the first segment.

8. The battery device according to claim 7, characterized in that, The first wall has a through hole and a groove. The through hole is configured as the mounting position. The groove communicates with the through hole and is arranged around the through hole. The second section is located inside the through hole. The groove contains the upper plastic.

9. The battery device according to claim 8, characterized in that, Along the thickness direction, the orthographic projection of the first segment onto the first wall falls within the groove, and a portion of the upper plastic protrudes from the groove.

10. The battery device according to claim 8, characterized in that, The insulating component also includes a lower plastic material disposed within the through hole and surrounding the second segment.

11. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 10.

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