Battery device and electric device

Abstract

The application is suitable for the technical field of batteries, and provides a battery device and a power utilization device. The battery device comprises a plurality of battery monomers and a busbar component. The plurality of battery monomers are connected through the busbar component. The battery monomer comprises a first wall and an electrode terminal. The first wall has a first side and a second side arranged opposite to each other in a first direction. The busbar component is arranged on the first side of the first wall. The electrode terminal comprises a first part and a second part arranged and connected in a second direction. The first part is arranged on the first side of the first wall and is arranged and connected in a stack with the first wall. At least part of the second part is arranged and connected in a stack with the busbar component. At least the part of the second part connected with the busbar component is arranged in the first wall. The first side surface of at least the part of the second part connected with the busbar component is lower than the first side surface of the first part. The battery device and the power utilization device provided by the application can reduce the occupation of the height space of the battery device by the busbar component.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery device and a power utilization device. BACKGROUND

[0002] In order to meet the power, power and voltage requirements of the battery device, a plurality of battery monomers are often provided in the battery device. The plurality of battery monomers are laser welded with the busbar component through the electrode terminal to realize series connection or parallel connection. However, there is at least one problem in this design: the electrode terminal and the busbar component are stacked and installed, that is, the busbar component is installed above the electrode terminal, which occupies the space in the height direction of the battery device. SUMMARY

[0003] In view of the above problems, the application provides a battery device and a power utilization device, which aims to reduce the occupation of the height space of the battery device by the busbar component.

[0004] In a first aspect, the embodiments of the application provide a battery device, comprising a plurality of battery monomers and a busbar component, the plurality of battery monomers are connected through the busbar component, the battery monomer comprises a first wall and an electrode terminal, the first wall has a first side and a second side arranged opposite to each other in a first direction, the busbar component is arranged on the first side of the first wall, the electrode terminal comprises a first part and a second part arranged and connected in a second direction, the first part is located on the first side of the first wall and is arranged and connected in a stack with the first wall; at least part of the second part is arranged and connected in a stack with the busbar component, and at least the part of the second part connected with the busbar component is arranged in the first wall; the first side surface of at least the part of the second part connected with the busbar component is lower than the first side surface of the first part; the second direction is arranged at an angle with the first direction.

[0005] The battery device provided by the embodiments of the application is adopted, the electrode terminal comprises a first part and a second part arranged and connected in a second direction, and the first part is connected with the first wall, that is, used for electrical connection with the electrode assembly in the battery monomer, the second part is arranged in the second direction with the first part and connected with the busbar component. Since at least the part of the second part connected with the busbar component is arranged in the first wall, and the first side surface of at least the part of the second part connected with the busbar component can be lower than the first side surface of the first part, so that the size of the combined structure of the battery monomer and the busbar component in the first direction is no longer the sum of the maximum size of the battery monomer in the first direction and the size of the busbar component in the first direction, and can be less than the sum of the maximum size of the battery monomer in the first direction and the size of the busbar component in the first direction, and greater than or equal to the maximum size of the battery monomer in the first direction, so that when the first direction is the height direction, the occupation of the height space of the battery device by the arrangement of the busbar component can be reduced to a certain extent.

[0006] In some possible implementation manners, the first side of the first wall is provided with a first accommodating groove, and at least a part of the second portion for connecting with the busbar component is arranged in the first accommodating groove.

[0007] The first accommodating groove is arranged to facilitate arranging at least a part of the second portion in the first wall and facilitating separation and maintenance of the two.

[0008] In some possible implementation manners, a side wall of the first accommodating groove is provided with a second accommodating groove; the second accommodating groove is in communication with the first accommodating groove; at least a part of a side wall of the second portion is provided with a first protrusion; at least a part of the first protrusion is arranged in the second accommodating groove; a first side of the second accommodating groove is arranged in a spaced manner with a first side of the first wall, and a blocking structure is formed between the two; the blocking structure is used to prevent the first protrusion from being pulled out of the second accommodating groove.

[0009] By using the scheme provided in this embodiment, the relative positions of the second portion and the first accommodating groove can be limited by cooperation of the second accommodating groove and the first protrusion, the pulling force of the electrode terminal is improved, the overall strength of the assembled busbar component is improved, the risk that the second portion is driven by the busbar component to be buckled or separated from the first accommodating groove in the use process is reduced, the shapes of the electrode terminal and the busbar component can be kept stable, the height space of the battery device is not occupied in the use process, and the performance of the battery device is also stabilized. The pulling force refers to the maximum axial force required to pull out the embedded or fixed second portion from the first wall.

[0010] In some possible implementation manners, the first protrusion is arranged around at least a part of the second portion.

[0011] The first protrusion is arranged around at least a part of the second portion, so that the length of the first protrusion is relatively long, the volume of the first protrusion inserted into the second accommodating groove is relatively large, and the first protrusion is not easy to be pulled out of the second accommodating groove.

[0012] In some possible implementation manners, the first side of the first wall is further provided with a third accommodating groove, and at least a part of the first portion is arranged in the third accommodating groove.

[0013] The third accommodating groove is arranged to facilitate arranging at least a part of the first portion in the first wall, and the size of the combined structure of the first portion and the first wall in the first direction can be reduced to facilitate installation of other structural members.

[0014] In some possible implementation manners, the third accommodating groove and the first accommodating groove are in communication to form a combined groove.

[0015] The third accommodating groove and the first accommodating groove are communicated, so that the connecting position of the first part and the second part can also be arranged in the combined groove, so that the size of the combined structure of the electrode terminal and the first wall is smaller than the sum of the sizes of the electrode terminal and the first wall in the first direction, the size of the combined structure of the electrode terminal and the first wall in the first direction can be reduced, and the installation of other structural members is facilitated.

[0016] In some possible implementation manners, the first wall comprises a metal member and a first insulating member arranged in sequence in the first direction, the first insulating member is arranged on the second side of the metal member, and the battery monomer further comprises a second insulating member arranged between the metal member and the electrode terminal, the shape of the second insulating member is matched with the shape of the electrode terminal, and at least part of the second insulating member is arranged in the combined groove.

[0017] By adopting the scheme provided in this embodiment, the mechanical strength of the first wall can be relatively large, and the first wall and the electrode terminal cannot be electrically contacted, which is more than one.

[0018] In some possible implementation manners, the side wall of the first accommodating groove is provided with a second accommodating groove, the second accommodating groove is communicated with the first accommodating groove, at least part of the side wall of the second part is provided with a first protruding part, the second insulating member is provided with a second protruding part corresponding to the first protruding part, the second protruding part is wrapped in the first protruding part, the second protruding part and the first protruding part form a protruding part assembly, at least part of the protruding part assembly is inserted into the second accommodating groove, the first side surface of the second accommodating groove is arranged in a spaced manner with the first side surface of the first wall, and a blocking structure is formed between the two, which is used to prevent the protruding part assembly from being pulled out of the second accommodating groove.

[0019] By matching the second accommodating groove, the first protruding part and the second protruding part, the relative positions of the second part and the first accommodating groove can be limited, the pulling force of the electrode terminal is improved, the overall strength of the assembled busbar member is improved, the risk that the second part is driven by the busbar member to be warped or separated from the first accommodating groove in the use process is reduced, the shapes of the electrode terminal and the busbar member can be kept stable, the height space of the battery device is not occupied in the use process, and the performance of the battery device is also stable.

[0020] In some possible implementation manners, the size of the first accommodating groove in the first direction is 0.5mm-1.5mm.

[0021] The thickness of the first wall is generally greater than 2mm, and the depth of the first accommodating groove is 0.5mm-1.5mm, which does not have a great impact on the mechanical strength or use function of the first wall, and the size of the combined structure of the first wall, the electrode terminal and the busbar member in the first direction can be reduced, which is more than one.

[0022] In some possible implementation manners, in the first direction, the size of at least the part of the second part connected with the busbar component is smaller than the size of the first part.

[0023] By adopting the scheme provided in the embodiment, the size of the combined structure of the busbar component, the first wall and the electrode assembly in the first direction is small, and the arrangement and installation of other structural members are facilitated.

[0024] In some possible implementation manners, in the first direction, the size of at least the part of the second part connected with the busbar component is smaller than the size of the first part.

[0025] The size of the busbar component in the first direction is 1 mm-2 mm, and by adopting the scheme provided in the embodiment, the second part is thinned by 0.5 mm-1 mm, so that the size of the combined structure of the busbar component, the first wall and the electrode assembly in the first direction is small, and the arrangement and installation of other structural members are facilitated.

[0026] In some possible implementation manners, in the first direction, the size of the combined structure of the first wall, the busbar component and the electrode terminal is smaller than or equal to the sum of the sizes of the first wall and the electrode terminal.

[0027] The embodiment can realize the size of the combined structure of the first wall, the busbar component and the electrode terminal as small as possible by means of setting the first accommodating groove and thinning the second part.

[0028] In some possible implementation manners, the first side surface of the first part is located in the same plane as the first side surface of the busbar component.

[0029] The embodiment can be implemented by means of setting the first accommodating groove and thinning the second part, and by adopting the scheme provided in the embodiment, compared with the prior art, the size of the combined structure of the first wall, the busbar component and the electrode terminal is saved in the size of the busbar component in the first direction, so that the height of the busbar component and the electrode terminal protruding from the first wall is consistent, the height of the battery device as a whole is not additionally occupied, the integration of the battery device is high, and the installation of other structural members is facilitated.

[0030] In some possible implementation manners, the second side surface of the second part is spaced apart from the second side surface of the first part in the first direction, and the second side surface of the second part is located close to the second side surface of the first wall.

[0031] In this way, compared with the second side surface of the second part and the second side surface of the first part being located in the same plane, the size of the combined structure of the busbar component, the first wall and the electrode terminal in the first direction is smaller.

[0032] In some possible implementation manners, the electrode terminal is an integral molded part.

[0033] The electrode terminal is formed in one piece, which makes the electrode terminal easy to manufacture and stable in structure.

[0034] In some possible implementation manners, the first part is riveted to the first wall.

[0035] The first part is riveted to the first wall, which makes the connection between the first part and the first wall stable, and makes the performance of the battery cell stable.

[0036] In some possible implementation manners, the first part is sealingly connected to the first wall.

[0037] The first part is sealingly connected to the first wall, which reduces the risk that external substances such as dirt, water and the like enter the battery cell through the gap between the first part and the first wall, and also reduces the risk that substances in the battery cell such as electrolyte flow out through the gap between the first wall and the first part.

[0038] In a second aspect, an embodiment of the present application provides a battery device.

[0039] The second aspect has the same effect as the first aspect, and details are not repeated here.

[0040] The above description is only a summary of the technical solutions of the present application, in order to enable the technical means of the present application to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to depict only preferred embodiments of the application, and therefore should not be considered to narrow the scope of the present application in any way. Instead, they are included to provide illustration of the preferred embodiments of the present application. In the drawings:

[0042] Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0043] Figure 2 An exploded structural schematic diagram of a battery device is provided for some embodiments of the present application;

[0044] Figure 3 An exploded structural schematic diagram of a battery cell in a battery device is provided for some embodiments of the present application;

[0045] Figure 4 An exploded structural schematic diagram of a battery cell and a busbar component in a battery device is provided for some embodiments of the present application;

[0046] Figure 5 This is a schematic diagram of the structure of the electrode terminals in a battery device provided in some embodiments of this application;

[0047] Figure 6 for Figure 5 A side view of the electrode terminals shown.

[0048] Figure 7 A schematic diagram of the combined structure of electrode terminals and first wall in a battery device provided in some embodiments of this application;

[0049] Figure 8 for Figure 7 The diagram shows the exploded structure of the combined structure.

[0050] Figure 9 For along Figure 7 Schematic diagram of the cross-sectional structure along line AA;

[0051] Figure 10 for Figure 9 Enlarged structural diagram at point A;

[0052] Figure 11 This is a schematic diagram of the structure of the second insulating element in a battery device provided in some embodiments of this application;

[0053] Figure 12 A side view of the combined structure of a battery cell and a busbar in a battery device provided in some embodiments of this application;

[0054] Figure 13 for Figure 12 A magnified structural diagram at point B in the middle.

[0055] The reference numerals in the detailed embodiments are as follows:

[0056] 1000, vehicles;

[0057] 100. Battery assembly; 200. Controller; 300. Motor;

[0058] 10. Housing; 11. Cover; 12. Tray; 20. Battery cell; 21. End cap; 22. Housing; 23. Electrode assembly; 231. Main body; 232. Tab; 24. Electrode terminal; 25. First wall; 25a. First receiving groove; 25b. Second receiving groove; 25b1. First side of the second receiving groove; 25c. Third receiving groove; 25d. First side of the first wall; 26. Barrier structure; 27. Second insulating component; 27a. Second protrusion; 28. Rivet; 29. ​​Sealing ring; 30. Busbar component; 30a. First side of the busbar component;

[0059] 241 first portion; 241a first side of the first portion; 241b second side of the first portion; 242 second portion; 242a first side of the second portion; 242b second side of the second portion; 243 first protrusion; 251 metal piece; 252 first insulating piece;

[0060] X second direction; Y width direction; Z first direction. DETAILED DESCRIPTION

[0061] The embodiments of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot be used to limit the protection scope of the present application.

[0062] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "comprise" and variations thereof, as used in the specification and in the claims and the aforementioned summary, are intended to cover a non-exclusive inclusion.

[0063] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0064] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0065] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0066] In the description of the embodiments of the present application, the term "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0067] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0068] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0069] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0070] The electrode terminal is the positive and negative electrode lead-out end of the battery monomer, which is fixed on the top cover sheet through a riveting process. In order to meet the power, power and voltage requirements of the battery device, multiple battery monomers are often provided in the battery device. Multiple battery monomers are laser welded with the busbar component through the electrode terminal to realize series connection or parallel connection. However, there is at least one problem in this design: the electrode terminal and the busbar component are stacked and installed, that is, the busbar component is installed above the electrode terminal, which occupies the space in the height direction of the battery device.

[0071] To improve the above problems, the embodiments of the present application provide a battery device. In the battery device, the electrode terminal includes a first part and a second part arranged and connected along a second direction, and the first part is connected with the first wall, that is, used to be electrically connected with the electrode assembly in the battery cell, and the second part is arranged along the second direction with the first part and connected with the busbar component. Since at least the part of the second part connected with the busbar component is arranged in the first wall, and the first side of at least the part of the second part connected with the busbar component can be lower than the first side of the first part, so that the size of the combined structure of the battery cell and the busbar component in the first direction is no longer the sum of the maximum size of the battery cell in the first direction and the size of the busbar component in the first direction, but can be less than the sum of the maximum size of the battery cell in the first direction and the size of the busbar component in the first direction, and greater than or equal to the maximum size of the battery cell in the first direction, so that when the first direction is the height direction, the occupation of the height space of the battery device by the arrangement of the busbar component can be reduced to a certain extent.

[0072] The battery device disclosed by the embodiments of the present application can be used in a power consumption device using the battery device as a power supply or various energy storage devices, energy storage systems and charging networks using the battery device as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc., and the spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0073] The following embodiments take a power consumption device of an embodiment of the present application as a vehicle 1000 for example for convenient description.

[0074] Please refer to Figure 1 , Figure 1 The vehicle 1000 provided by some embodiments of the present application is a structural schematic diagram. The vehicle 1000 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0075] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0076] Please refer to Figure 2 , Figure 2 The exploded structural schematic diagram of the battery device 100 provided for some embodiments of the present application is shown. The battery device 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10.

[0077] The box body 10 is used to provide a containing space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a cover body 11 and a tray 12. The cover body 11 covers the tray, and the cover body 11 and the tray 12 together define a containing space for containing the battery cell 20. The tray 12 can be a hollow structure with one end open, and the cover body 11 can be a plate-shaped structure. The cover body 11 covers the open side of the tray 12, so that the cover body 11 and the tray 12 together define the containing space. The cover body 11 and the tray 12 can also be hollow structures with open sides. The open side of the cover body 11 covers the open side of the tray 12. Of course, the cover body 11 and the tray 12 can form a box body 10 with various shapes, such as a circular through portion, a cuboid, etc. The above-mentioned tray 12 is an important structural bearing member in the battery device, which is used to accommodate and protect the battery cell, and has an important influence on the collision safety of the whole vehicle and the torsional and bending stiffness of the whole vehicle body.

[0078] The battery cell 20 can be provided in multiple numbers. The multiple battery cells 20 are connected in series, in parallel, or in a mixed connection. The mixed connection means that there are both series connection and parallel connection among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 20 is contained in the box body 10. Of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is contained in the box body 10. The battery device 100 can further include other structures, for example, the battery device 100 can further include a current collecting component for realizing the electrical connection between the multiple battery cells 20. As an example, the multiple battery cells 20 can form a battery module, and the battery module is formed by arranging and fixing the multiple battery cells 20 into an independent module. As an example, the battery module can be formed by binding the multiple battery cells 20 with a cable tie.

[0079] Each battery cell 20 can be a secondary battery or a primary battery. The secondary battery refers to a battery cell that can be activated by charging after discharging. The battery cell 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited in this regard. The battery cell can be a round through portion, a flat body, a cuboid, or other shapes, etc.

[0080] Please refer to Figure 3 , Figure 3 The exploded structural diagram of the battery cell in the battery device provided by some embodiments of the present application is shown. The battery cell 20 refers to the smallest unit that constitutes the battery. As Figure 3 , the battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23, and other functional components (such as electrode terminals, pressure relief mechanisms, etc.).

[0081] The end cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to fit the shell 22. Optionally, the end cover 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 21 is not easily deformed when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength, and the safety performance can also be improved. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations in this regard. In some embodiments, a second insulating member can also be provided on the inner side of the end cover 21, which can be used to isolate the electrical connection components in the shell 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the second insulating member can be plastic, rubber, etc.

[0082] The shell 22 is a component for cooperating with the end cover 21 to form an internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components. The shell 22 and the end cover 21 can be independent components, and an opening can be provided on the shell 22, and the end cover 21 is used to cover the opening to form the internal environment of the battery cell 20. Without limitation, the end cover 21 and the shell 22 can also be integrated, specifically, the end cover 21 and the shell 22 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 22, the end cover 21 is used to cover the shell 22. The shell 22 can be various shapes and sizes, such as a cuboid, a circular through portion, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations.

[0083] The electrode assembly 23 is a component where electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 can be contained in the shell 22. The electrode assembly 23 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting a main body 231 of the electrode assembly, and a portion without active material of the positive electrode sheet and the negative electrode sheet respectively constituting a tab 232. The positive electrode tab and the negative electrode tab can be located at one end of the main body or at two ends of the main body respectively. In the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 232 connects the electrode terminal to form a current loop.

[0084] The electrode terminal 24 can be provided on the end cover 21 or the shell 22, and is used to electrically connect with the electrode assembly 23, so as to output or input the electric energy of the battery cell 20. The pressure relief mechanism can also be provided on the end cover 21 or the shell 22, and is used to release the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value.

[0085] Please refer to Figures 4 to 6 , Figure 4 the exploded structural schematic diagram of the battery cell and the busbar component in the battery device provided by some embodiments of the present application, Figure 5 the structural schematic diagram of the electrode terminal in the battery device provided by some embodiments of the present application, Figure 6 Figure 5 ​A side view structural schematic diagram of the electrode terminal is shown. The battery device includes a plurality of battery cells 20 and a busbar component 30. The plurality of battery cells 20 are connected by the busbar component 30. The battery cell 20 includes a first wall 25 and an electrode terminal 24. The first wall 25 has a first side and a second side arranged opposite to each other in a first direction Z. The busbar component 30 is arranged on the first side of the first wall 25. The electrode terminal 24 includes a first portion 241 and a second portion 242 arranged and connected in a second direction X. The first portion 241 is arranged on the first side of the first wall 25 and is arranged and connected in a stack with the first wall 25. At least a portion of the second portion 242 is arranged and connected in a stack with the busbar component 30, and at least the portion of the second portion 242 connected with the busbar component 30 is arranged in the first wall 25. The first side surface of at least the portion of the second portion 242 connected with the busbar component 30 is lower than the first side surface 241a of the first portion. The second direction X is arranged at an angle with the first direction Z.

[0086] The busbar component 30 is a key structural component for realizing current collection and distribution, and its core function is to conduct the current of the plurality of battery cells 20 to an external circuit or to evenly distribute the current among different battery cells 20.

[0087] The busbar component 30 can be made of a metal material, can be in a flat strip shape or a multi-layer laminated shape, and can be elastic and can be bent, which can be determined according to the needs of use. The metal material can be copper, aluminum, nickel-plated copper, etc., which can be determined according to the needs of use. The busbar component 30 can be fixed with the battery cell 20 by laser welding, bolt connection, etc.

[0088] The plurality of battery cells 20 connected by the busbar component 30 means that the plurality of battery cells 20 are connected in series, in parallel or in a mixed connection by the busbar component 30. The mixed connection means that there are both series connection and parallel connection among the plurality of battery cells 20.

[0089] The first wall 25 is a structure for bearing the electrode terminal 24, which can be the above-mentioned end cover 21, or a side wall or bottom wall of the shell 22, which can be determined according to the arrangement position of the electrode terminal 24. That is, when the electrode terminal 24 is arranged on the end cover 21, the first wall 25 at least includes the end cover 21; when the electrode terminal 24 is arranged on the side wall of the shell 22, the first wall 25 at least includes the side wall of the shell 22 on which the electrode terminal 24 is arranged; and when the electrode terminal 24 is arranged on the bottom wall of the shell 22, the first wall 25 at least includes the bottom wall of the shell 22.

[0090] The first wall 25 can be made of an insulating material, or can be partly made of a metal material and partly made of an insulating material, can be composed of one part, or can be composed of multiple parts. It can be understood that, since the electrode terminal 24 is generally a conductor, in order to avoid the first wall 25 being in conductive connection with the electrode terminal 24, the part of the first wall 25 in contact with the electrode terminal 24 is an insulating part.

[0091] For example, when the electrode terminal 24 is arranged on the end cover 21 of the battery monomer 20, and the end cover 21 is made of a metal material, a second insulating part 27 is often arranged between the electrode terminal 24 and the end cover 21, in which case the first wall 25 at least includes the end cover 21 and the insulating part arranged between the end cover 21 and the electrode terminal 24; when the electrode terminal 24 is arranged on the end cover 21 of the battery monomer 20, and the end cover 21 is made of a non-metal material, the first wall 25 can only include the end cover 21.

[0092] When the electrode terminal 24 is arranged on a side wall of the shell 22 of the battery monomer 20, the first wall 25 at least includes the side wall of the shell 22, and can further include other structures arranged on the side wall, such as an insulating part, etc.; when the electrode terminal 24 is arranged on the bottom wall of the shell 22 of the battery monomer 20, the first wall 25 at least includes the bottom wall of the shell 22, and can further include other structures arranged on the bottom wall, such as an insulating part, etc.

[0093] The first direction Z is generally the height direction of the battery monomer 20, or can be the thickness direction (also the width direction) of the battery monomer 20, etc., and can be determined according to the position of the electrode terminal 24. For example, when the electrode terminal 24 is located on the end cover 21 or the bottom wall, the first direction Z is the height direction of the battery monomer 20; when the electrode terminal 24 is located on a large face of the shell 22, the first direction Z is the thickness direction of the battery monomer 20; when the electrode terminal 24 is located on a small face of the shell 22, the first direction Z is the width direction of the battery monomer 20. The large face is a face formed by the length direction and the width direction (also the thickness direction) of the battery monomer 20, and the small face is a face formed by the width direction and the thickness direction of the battery monomer 20.

[0094] The second direction X can be perpendicular to the first direction Z, or can be at other angles with the first direction Z, such as 60°, 80° or other angles, and can be determined according to the needs.

[0095] It can be understood that the battery monomer 20 further has an electrode assembly 23 arranged on the second side of the first wall 25.

[0096] The electrode terminal 24 refers to all the conductive interfaces in the battery monomer 20 for connecting the internal and external circuits, is a key component for connecting the internal electrode of the battery monomer 20 and the external circuit, and is usually made of copper, aluminum, nickel-plated material, etc.

[0097] The electrode terminal 24 in the embodiment can only include the first portion 241 and the second portion 242, or can further include other portions in addition to the first portion 241 and the second portion 242, such as a third portion connecting the first portion 241 and the second portion 242, which can be determined according to the use requirement.

[0098] The first portion 241 and the second portion 242 are both constituent parts of the electrode terminal 24, which can be integrally formed by the same material, or can be separately arranged and then connected, which can be determined according to the use requirement.

[0099] The electrode terminal 24 in the embodiment is a flat sheet structure, which is arranged on one side of the first wall 25 facing the busbar component 30. The first portion 241 and the second portion 242 are both parts of the sheet structure, which can be arranged in a sheet shape or a block shape respectively. The first portion 241 is arranged protruding from the first wall 25.

[0100] The first portion 241 and the first wall 25 are arranged in a stacked manner and connected, which means that the first portion 241 and the first wall 25 are integrated in structure and electricity by physical stacking (such as lamination process) and fixing mode (such as welding, mechanical fastening, etc.).

[0101] The part of the second portion 242 connected with the busbar component 30 is arranged in the first wall 25, which can be that the second portion 242 is arranged in the first wall 25 as a whole, or can be that only the part of the second portion 242 connected with the busbar component 30 is arranged in the first wall 25, or can be that the part of the second portion 242 connected with the busbar component 30 and other parts are arranged in the first wall 25, which can be determined according to the use requirement. The arrangement mode can be achieved by physical nesting, interference fit, injection molding packaging or welding, etc.

[0102] It can be understood that after at least part of the second part 242 is arranged in the first wall 25, at least part of the surface of the second part 242 can be exposed through the opening of the cavity or the accommodating groove containing the second part 242, or protrude from the first wall 25, so that the current collecting component 30 is connected with the second part 242. In the embodiment, the thickness of the first part 241 and the second part 242 can be the same or different, which can be determined according to the use requirement. For example, in order to make the height of the combination of the current collecting component 30 and the battery monomer 20 smaller, the thickness of the second part 242 can be less than or equal to the thickness of the first part 241; for example, the thickness of the part of the second part 242 arranged in the first wall 25 is larger, and the thickness of the second part 242 can be greater than the thickness of the first part 241. The thickness of the first part 241 refers to the size of the first part 241 in the first direction Z, and the thickness of the second part 242 refers to the size of the second part 242 in the first direction Z. The height of the combination of the current collecting component 30 and the battery monomer 20 refers to the size of the structure of the combination of the current collecting component 30 and the battery monomer 20 in the first direction Z.

[0103] The connection between at least part of the second part 242 and the current collecting component 30 means that the two can be physically and electrically connected through welding, bolt connection and the like.

[0104] The first side of at least the part of the second part 242 connected with the current collecting component 30 is lower than the first side 241a of the first part, which means that in the first direction Z, the distance between the first side of at least the part of the second part 242 connected with the current collecting component 30 and the bottom surface of the battery monomer 20 is smaller than the distance between the first side 241a of the first part and the bottom surface of the battery monomer 20.

[0105] In the related art, the electrode terminal 24 only has one part, i.e. the first part 241, through which the electrode terminal 24 is electrically connected with the electrode assembly 23 in the battery monomer 20, and through which the electrode terminal 24 is connected with the current collecting component 30, so that the size of the combination structure of the battery monomer 20 and the current collecting component 30 in the first direction Z is the sum of the sizes of the battery monomer 20 and the current collecting component 30 in the first direction Z.

[0106] The electrode terminal 24 includes a first portion 241 and a second portion 242 arranged along the second direction X and connected, and the first portion 241 is connected with the first wall 25, i.e., used to be electrically connected with the electrode assembly 23 in the battery monomer 20, and the second portion 242 is arranged along the second direction with the first portion 241 and connected with the busbar component 30. Since the part of at least the second portion 242 connected with the busbar component 30 is arranged in the first wall 25, and the first side surface of at least the part of the second portion connected with the busbar component 30 can be lower than the first side surface 241a of the first portion, the size of the combined structure of the battery monomer 20 and the busbar component 30 in the first direction Z is no longer the sum of the maximum size of the battery monomer 20 in the first direction Z and the size of the busbar component 30 in the first direction Z, but can be less than the sum of the maximum size of the battery monomer 20 in the first direction Z and the size of the busbar component 30 in the first direction, and greater than or equal to the maximum size of the battery monomer 20 in the first direction Z, so that when the first direction Z is the height direction, the occupation of the height space of the battery device by the arrangement of the busbar component 30 can be reduced to a certain extent.

[0107] As shown in Figure 7 and Figure 8 , the combined structure of the electrode terminal and the first wall in the battery device provided by some embodiments of the present application is shown in Figure 7 , which is a structural schematic diagram of the combined structure of the electrode terminal and the first wall in the battery device provided by some embodiments of the present application, Figure 8 , which is an exploded structural schematic diagram of the combined structure shown in Figure 7 , in some embodiments, the first side surface 25d of the first wall is provided with a first accommodating groove 25a. The part of at least the second portion 242 used to be connected with the busbar component is arranged in the first accommodating groove 25a.

[0108] The first side surface 25d of the first wall is the surface of the first wall 25 located at the first side.

[0109] The first accommodating groove 25a is a groove for accommodating at least part (the part used to be connected with the busbar component) of the second portion 242, which can be integrally formed on the first wall 25 or formed on the first wall 25 by cutting, stamping or other methods.

[0110] The size and shape of the first accommodating groove 25a can be determined according to the size and shape of the part of the second portion 242 that needs to be arranged in the first wall 25.

[0111] The arrangement of the first accommodating groove 25a facilitates the arrangement of at least part of the second portion 242 in the first wall 25 and facilitates the separation and maintenance of the two.

[0112] As shown in Figure 9 and Figure 10 , the combined structure of the electrode terminal and the first wall in the battery device provided by some embodiments of the present application is shown in Figure 9 , which is a cross-sectional structural schematic diagram along the A-A line in Figure 7 ,Figure 10 For Figure 9 An enlarged structural schematic view at A in FIG. 6. In some embodiments, the side wall of the first accommodating groove 25a is provided with a second accommodating groove 25b. The second accommodating groove 25b is in communication with the first accommodating groove 25a. At least part of the side wall of the second portion 242 is provided with a first protrusion 243. At least part of the first protrusion 243 is inserted into the second accommodating groove 25b. The first side 25b1 of the second accommodating groove is spaced apart from the first side 25d of the first wall, and a blocking structure 26 is formed therebetween. The blocking structure 26 is used to prevent the first protrusion 243 from being pulled out of the second accommodating groove 25b.

[0113] The second accommodating groove 25b is a recess for accommodating the protrusion, which can be integrally formed on the first wall 25 or can be made by cutting, stamping or the like after the first wall 25 and the first accommodating groove 25a are formed. The bottom surface of the second accommodating groove 25b can be flush with the bottom surface of the first accommodating groove 25a or can be spaced apart from the bottom surface of the first accommodating groove 25a, which can be determined according to the needs of use. However, no matter how, the first side 25b1 of the second accommodating groove is spaced apart from the first side 25d of the first wall. The first side 25b1 of the second accommodating groove is the surface of the second accommodating groove 25b on the first side, which is opposite to the bottom surface.

[0114] The first protrusion 243 is a protruding structure protruding from at least part of the side wall of the second portion 242, which can be a protruding block, a protruding rib or the like, and can be integrally formed on the second portion 242 or connected to the second portion 242 by insertion, welding or the like, which can be determined according to the needs of use.

[0115] The blocking structure 26 is a solid structure between the first side 25b1 of the second accommodating groove and the first side 25d of the first wall. The presence of the blocking structure 26 can prevent the first protrusion 243 from being pulled out of the first side of the second accommodating groove 25b.

[0116] By adopting the scheme provided in the embodiment, the relative positions of the second portion 242 and the first accommodating groove 25a can be limited by the cooperation of the second accommodating groove 25b and the first protrusion 243, the pulling force of the electrode terminal 24 can be improved, the overall strength of the busbar assembly 30 after assembly can be improved, the risk of the second portion 242 being lifted or separated from the first accommodating groove 25a by the busbar assembly 30 during use can be reduced, the shapes of the electrode terminal 24 and the busbar assembly 30 can be kept stable, the height space of the battery device is not occupied during use, and the performance of the battery device can be stabilized. The pulling force refers to the maximum axial force required to pull out the embedded or fixed second portion 242 from the first wall 25.

[0117] As Figure 5As shown, in some embodiments, the first protrusion 243 is disposed around at least a portion of the second portion 242.

[0118] The first protrusion 243 is provided to surround at least a portion of the second portion 242, meaning that the first protrusion 243 can completely or partially surround a section of the second component.

[0119] The first protrusion 243 is arranged around at least part of the second portion 242, which can make the length of the first protrusion 243 longer and the volume inserted into the second receiving groove 25b larger, making it difficult for the first protrusion 243 to fall out of the second receiving groove 25b.

[0120] like Figure 7 and Figure 8 As shown, in some embodiments, a third receiving groove 25c is further provided on the first side of the first wall 25. At least a portion of the first portion 241 is disposed within the third receiving groove 25c.

[0121] The third receiving groove 25c is a groove that receives at least a portion of the first part 241. It can be integrally formed on the first wall 25, or it can be made by cutting, stamping or other means after the first wall 25 is formed.

[0122] The size and shape of the third receiving groove 25c can be determined according to the size and shape of the part of the first part 241 that needs to be located inside the first wall 25.

[0123] The third receiving groove 25c is provided so that at least a portion of the first part 241 can be disposed within the first wall 25, which can reduce the size of the combined structure of the first part 241 and the first wall 25 in the first direction, so as to facilitate the installation of other structural components.

[0124] like Figure 8 As shown, in some embodiments, the third receiving groove 25c and the first receiving groove 25a are connected to form a combined groove.

[0125] The third receiving groove 25c is connected to the first receiving groove 25a, so that the connection between the first part 241 and the second part 242 can also be located in the combined groove. This makes the size of the combined structure of the electrode terminal 24 and the first wall 25 smaller than the sum of the sizes of the electrode terminal 24 and the first wall 25 in the first direction. This can reduce the size of the combined structure of the electrode terminal 24 and the first wall 25 in the first direction, so as to facilitate the installation of other structural components.

[0126] like Figure 7 and Figure 8 As shown, in some embodiments, the first wall 25 is a metal part 251. The battery cell 20 also includes a second insulating member 27 disposed between the first wall 25 and the electrode terminal 24. The shape of the second insulating member 27 is adapted to the shape of the electrode terminal 24, and at least a portion of the second insulating member 27 is disposed within the assembly groove.

[0127] The first wall 25 uses a metal part 251, which makes it have greater mechanical strength, structural stability and less prone to damage.

[0128] The second insulating component 27 is a component used to block the electrical connection between the electrode terminal 24 and the first wall 25. It can be made of rubber, silicone, etc., depending on the specific application requirements.

[0129] The shape of the second insulating member 27 is adapted to the shape of the electrode terminal 24. This means that the second insulating member 27 and the electrode terminal 24 are designed in a complementary or coordinated manner to ensure that their dimensions and contours are precisely matched (such as concave-convex fitting), thereby ensuring that no area of ​​the electrode terminal 24 is in electrical contact with the first wall 25.

[0130] For example, when the second part 242 is provided with a first protrusion 243, the second insulating member 27 is provided with a second protrusion 27a, the second protrusion 27a covers the first protrusion 243 therein, the first protrusion 243 and the second protrusion 27a form a protrusion assembly, at least a portion of the protrusion assembly is inserted into the second receiving groove 25b.

[0131] The fact that at least a portion of the second insulating member 27 is disposed within the combined groove means that, depending on the use requirements, the entire second insulating member 27 may be located within the combined groove, or a portion of the second insulating member 27 may be located within the combined groove and the other portion may be located outside the combined groove.

[0132] The solution provided in this embodiment can achieve both high mechanical strength of the first wall 25 and prevent electrical contact between the first wall 25 and the electrode terminal 24, thus achieving multiple benefits.

[0133] like Figures 9 to 11 As shown, Figure 11 This is a schematic diagram of the structure of the second insulating member in a battery device provided in some embodiments of this application. In some embodiments, the sidewall of the first receiving groove 25a is provided with a second receiving groove 25b. The second receiving groove 25b communicates with the first receiving groove 25a. At least a portion of the sidewall of the second part 242 is provided with a first protrusion 243. The second insulating member 27 is provided with a second protrusion 27a corresponding to the first protrusion 243. The second protrusion 27a covers the first protrusion 243 therein. The second protrusion 27a and the first protrusion 243 form a protrusion assembly. At least a portion of the protrusion assembly is inserted into the second receiving groove 25b. The first sidewall 25b1 of the second receiving groove and the first sidewall 25d of the first wall are spaced apart, forming a blocking structure 26 between them. The blocking structure 26 is used to prevent the protrusion assembly from being dislodged from the second receiving groove 25b.

[0134] In this embodiment, the second insulating member 27 is provided with a receiving groove, and the electrode terminal 24 is disposed in the receiving groove.

[0135] The second protrusion 27a is slightly larger than the first protrusion 243 in all directions, and can cover the first protrusion 243 therein.

[0136] By employing the solution provided in this embodiment, the relative position of the second part 242 and the first receiving groove 25a can be defined through the cooperation of the second receiving groove 25b, the first protrusion 243 and the second protrusion 27a, thereby increasing the pull-out force of the electrode terminal 24, improving the overall strength of the busbar component 30 after assembly, and reducing the risk that the second part 242 may be lifted or detached from the first receiving groove 25a by the busbar component 30 during use. This ensures that the shape of the electrode terminal 24 and the busbar component 30 remains stable, and the height space of the battery device is not occupied during use, which also helps to stabilize the performance of the battery device.

[0137] In some embodiments, the size of the first receiving groove 25a in the first direction Z is 0.5mm-1.5mm.

[0138] The dimension of the first receiving groove 25a in the first direction Z is the depth of the first receiving groove 25a.

[0139] In this embodiment, the depth of the first receiving groove 25a can be any value between 0.5mm and 1.5mm, such as 0.6mm, 0.8mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc., which can be determined according to the usage requirements.

[0140] The thickness of the first wall 25 is generally greater than 2mm, and the depth of the first receiving groove 25a is 0.5mm-1.5mm. This will not have a significant impact on the mechanical strength or function of the first wall 25, and it can reduce the size of the combined structure composed of the first wall 25, electrode terminal 24 and busbar component 30 in the first direction, achieving multiple benefits.

[0141] like Figure 6 As shown, in some embodiments, in the first direction Z, the size d20 of at least the portion of the second portion 242 used for connection with the busbar is smaller than the size d10 of the first portion 241.

[0142] In the embodiment, the size of any region of the second portion 242 in the first direction Z can be the same, i.e. the second portion 242 is of an equal thickness structure, or the second portion 242 can be of a non-equal thickness structure, some regions having a greater thickness and some regions having a smaller thickness. The size d20 of at least the portion of the second portion 242 connected to the busbar component in the first direction Z is smaller than the size d10 of the first portion 241, which can mean that the size d20 of any region of the second portion 242 in the first direction Z is smaller than the size d10 of the first portion 241, or the size d20 of only the portion of the second portion 242 connected to the busbar component is smaller than the size d10 of the first portion 241.

[0143] It should be noted that the first portion 241 can also be of an equal thickness structure or a non-equal thickness structure. When the first portion 241 is of an equal thickness structure, the size of the first portion 241 refers to the size of any region of the first portion 241 in the first direction. When the first portion 241 is of a non-equal thickness structure, the size of the first portion 241 can be the minimum size, the maximum size or the average size of the first portion 241 in the first direction.

[0144] If the first portion 241 has multiple regions each having a different size in the first direction, the sizes are respectively denoted as d1, d2, …, dn, where d2 is smaller than d1 and smaller than dn, and d2 is the smallest size among all the sizes, the minimum size of the first portion 241 is d2; da is greater than d1, greater than d2 and greater than dn, and da is the largest size among all the sizes, the maximum size of the first portion 241 is da; and the average size is (d1+d2+…+dn) / n.

[0145] Similarly, if the portion of the second portion 242 connected to the busbar component 30 is of an equal thickness structure, the size of the portion of the second portion 242 connected to the busbar component 30 refers to the size of any region of the portion of the second portion 242 connected to the busbar component 30 in the first direction. If the portion of the second portion 242 connected to the busbar component 30 is of a non-equal thickness structure, the size of the portion of the second portion 242 connected to the busbar component 30 can be the minimum size, the maximum size or the average size of the portion of the second portion 242 connected to the busbar component 30 in the first direction.

[0146] That is, the present embodiment at least includes the following cases: first, in the first direction, the maximum dimension of at least the portion of the second portion 242 connected to the busbar component 30 is smaller than the minimum dimension of the first portion 241; second, in the first direction, the maximum dimension of at least the portion of the second portion 242 connected to the busbar component 30 is smaller than the maximum dimension of the first portion 241; third, in the first direction, the minimum dimension of at least the portion of the second portion 242 connected to the busbar component 30 is smaller than the minimum dimension of the first portion 241; fourth, in the first direction, the minimum dimension of at least the portion of the second portion 242 connected to the busbar component 30 is smaller than the maximum dimension of the first portion 241; fifth, in the first direction, the average dimension of at least the portion of the second portion 242 connected to the busbar component 30 is smaller than the average dimension of the first portion 241; sixth, in the first direction, the average dimension of at least the portion of the second portion 242 connected to the busbar component 30 is smaller than the minimum dimension of the first portion 241; and seventh, in the first direction, the maximum dimension of at least the portion of the second portion 242 connected to the busbar component 30 is smaller than the average dimension of the first portion 241.

[0147] The scheme provided in the present embodiment can make the combined structure of the busbar component 30, the first wall 25 and the electrode assembly 23 smaller in the first direction, facilitating the arrangement and installation of other structural members.

[0148] In some embodiments, in the first direction Z, the dimension of at least the portion of the second portion 242 used for connection with the busbar component 30 is 0.5-1 mm smaller than the dimension of the first portion 241.

[0149] In the present embodiment, in the first direction, the dimension of at least the portion of the second portion 242 used for connection with the busbar component 30 is any value in the range of 0.5-1 mm smaller than the dimension of the first portion 241, such as 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm.

[0150] The dimension of the busbar component 30 in the first direction is 1-2 mm. The scheme provided in the present embodiment can make the second portion 242 thinned by 0.5-1 mm, and can make the combined structure of the busbar component 30, the first wall 25 and the electrode assembly 23 smaller in the first direction, facilitating the arrangement and installation of other structural members.

[0151] In some embodiments, in the first direction Z, the dimension of the combined structure of the first wall 25, the busbar component 30 and the electrode terminal 24 is smaller than or equal to the sum of the dimensions of the first wall 25 and the electrode terminal 24.

[0152] The embodiment can be implemented by setting the first accommodating groove 25a, thinning the second part 242, and the like, so that the size of the combined structure of the first wall 25, the busbar component 30, and the electrode terminal 24 is reduced as much as possible.

[0153] As shown in Figure 12 and Figure 13 shown, Figure 12 is a side view structural schematic diagram of a combined structure of a battery monomer and a busbar component in a battery device provided by some embodiments of the present application, Figure 13 is Figure 12 an enlarged structural schematic diagram at B in In some embodiments, the first side surface 241a of the first part is located in the same plane as the first side surface 30a of the busbar component.

[0154] The embodiment can be implemented by setting the first accommodating groove 25a, thinning the second part 242, and the like. Compared with the prior art, the size of the combined structure of the first wall 25, the busbar component 30, and the electrode terminal 24 is reduced by the size of the busbar component 30 in the first direction, so that the height of the busbar component 30 and the electrode terminal 24 protruding from the first wall 25 is consistent, without occupying the overall height of the battery device, so that the integration of the battery device is higher, and the installation of other structural members is facilitated.

[0155] Figure 6 As shown in In some embodiments, the second side surface 242b of the second part is spaced apart from the second side surface 241b of the first part in the first direction Z, and the second side surface of the second part is close to the second side surface of the first wall 25.

[0156] The second side surface 242b of the second part refers to the surface of the second part 242 on the second side. The second side surface 241b of the first part refers to the surface of the first part 241 on the second side.

[0157] The second side surface 242b of the second part is spaced apart from the second side surface 241b of the first part in the first direction, and the second side surface of the second part is close to the second side surface of the first wall 25, which means that the second side surface 242b of the second part is spaced apart from the second side surface 241b of the first part in the first direction, and the second side surface 242b of the second part is closer to the second side surface of the first wall 25 than the second side surface 241b of the first part.

[0158] In this way, compared with the second side surface 242b of the second part and the second side surface 241b of the first part being located in the same plane, the size of the combined structure of the busbar component 30, the first wall 25, and the electrode terminal 24 in the first direction can be smaller.

[0159]

[0160] The integrally formed member refers to a complete part without splicing and assembling, which is manufactured through a single forming process (such as casting, 3D printing, stamping, etc.).

[0161] The electrode terminal 24 is an integrally formed member, which can facilitate the preparation of the electrode terminal 24 and stabilize the structure.

[0162] In some embodiments, the first part 241 and the first wall 25 are riveted.

[0163] Riveting is a process of permanently connecting parts by mechanical deformation, which can use rivets, riveting blocks or other riveting members 28 to plastically deform the material and form a firm mechanical locking structure.

[0164] The first part 241 and the first wall 25 are riveted, which can stabilize the connection between the two and stabilize the performance of the battery monomer 20.

[0165] In some embodiments, the first part 241 is sealingly connected to the first wall 25.

[0166] The first part 241 and the first wall 25 in the embodiment can realize sealing between the two by sleeving a sealing ring 29 on the rivet, or can realize sealing by coating sealant at the gap between the first wall 25 and the rivet, or can realize sealing connection of the first part 241 and the first wall 25 in other ways, which can be determined according to the use needs.

[0167] The first part 241 and the first wall 25 are sealingly connected, which can reduce the risk of external substances such as stains, water, etc. entering the battery monomer 20 through the gap between the first part 241 and the first wall 25, and can also reduce the risk of substances in the battery monomer 20, such as electrolyte, etc. flowing out through the gap between the first wall 25 and the first part 241.

[0168] According to some embodiments of the present application, the present application also provides a power consuming device comprising the battery device provided in any of the above schemes. The battery device is used for storing or providing electric energy.

[0169] The power consuming device can be a device or system of any of the above applications.

[0170] The power consuming device provided in the embodiments of the present application comprises the above battery device and can achieve the same effects, which will not be described here.

[0171] As Figures 2 to 13As shown, an embodiment of the present application provides a battery device. The battery device includes a plurality of battery cells 20 and a busbar component 30. The plurality of battery cells 20 are connected by the busbar component 30. The battery cell 20 includes a first wall 25 and an electrode terminal 24. The first wall 25 has a first side and a second side arranged opposite to each other in a first direction. The first wall 25 is a top cover assembly. The top cover assembly is provided with a plurality of sub-components, and the basic functions of the top cover are realized by assembly cooperation. The top cover assembly includes a metal sheet (also referred to as a top cover sheet) and a first insulating member 252. The function of the top cover sheet is the mounting base of all sub-components, and the top cover sheet is generally made of aluminum alloy material. The electrode terminal 24 includes a negative pole and a positive pole. The negative pole and the positive pole are respectively riveted to the top cover assembly through copper riveting blocks. The main reason for using copper riveting blocks for the negative pole is that the negative pole sheet inside the battery cell 20 is a copper foil, and the lead-out end is also copper. Using copper riveting blocks is beneficial to the welding connection of the tab 232 and the pole.

[0172] A sunken area is provided on the top cover sheet. The sunken size of the sunken area is 0.5 mm-1.5 mm larger than that of the riveting area. This can make the corresponding pole welding area (the part welded with the busbar component 30) sink by 0.5 mm-1.5 mm. In combination with the thickness reduction of the pole welding area by 0.5 mm-1 mm, the total height of the welding area can be reduced by 1 mm-2 mm.

[0173] The first insulating member 252 is a lower plastic, which is fixed together with the top cover sheet through riveting or bonding, and plays a role in pressing the tab 232 to prevent the tab 232 from shaking up and down inside the battery cell 20 during actual use, causing fatigue fracture of the tabs 232 inside the positive and negative poles.

[0174] Because the welding area and the riveting area of the electrode terminal 24 are separated in function in this embodiment, the overall strength of the electrode terminal 24 will be reduced due to the lever effect. Therefore, a circle of grooves (denoted as a second accommodating groove 25b) is provided at the bottom of the lower area of the top cover sheet. A circle of corresponding first protrusions is provided on the electrode terminal 24. At the same time, a circle of corresponding second protrusions is provided at the bottom of the upper plastic. The three can be effectively matched after installation to form a stable and reliable mechanical connection. In actual application, appropriate glue can also be applied at the interfaces to improve the connection strength.

[0175] A second insulating member 27 is further provided between the top cover sheet and the electrode terminal 24. The second insulating member 27 is an upper plastic, which is used to isolate the electrode terminal 24 and the top cover sheet, and plays an insulating role.

[0176] The battery cell 20 further includes a sealing ring 29 sleeved outside the riveting block. The sealing ring 29 can improve the sealing between the electrode terminal 24 and the inside of the battery cell 20, and prevent electrolyte leakage.

[0177] The traditional stacking installation method not only limits the space utilization of the battery device, but also may cause the decline of the heat dissipation performance and assembly efficiency of the battery device, thereby affecting the overall performance and reliability of the battery device. Therefore, an optimized installation scheme is urgently needed to improve the space utilization and grouping efficiency of the battery device.

[0178] The battery device provided by the embodiment integrates the electrode terminal 24 and the top cover assembly, optimizes the structure of the top cover assembly, independently sinks and optimizes the thinning design of the welding area of the electrode terminal 24, forms a certain height difference between the welding area of the electrode terminal 24 and the busbar component 30 and other parts of the top cover assembly, and enables the busbar component 30 to achieve a similar side-by-side effect with the riveting part of the electrode terminal 24.

[0179] The welding area of the electrode terminal 24 is thinned, which further reduces the height under the premise of meeting the mechanical strength and electrical conductivity, and provides sufficient space for the embedding of the busbar component 30. At the same time, the thinning design does not affect the sealing and insulation performance of the electrode terminal 24, ensuring the normal work of the battery monomer 20.

[0180] This design not only meets the welding requirements of the electrode terminal 24 and the busbar component 30, but also provides a space basis for the height hiding of the busbar component 30, and realizes the height sharing of the electrode terminal 24 and the busbar component 30. After improvement, the busbar component 30 no longer needs to be stacked and installed above the electrode terminal 24, but is embedded into the sinking space of the welding area of the electrode terminal 24 through the integrated top cover assembly design. The height stacking problem of the electrode terminal 24 and the busbar component 30 in the original system is solved, and the system height only needs to reserve the height of the electrode terminal 24, while the height of the busbar component 30 is perfectly hidden, so that the battery device can be arranged more compactly, which significantly improves the height space utilization of the battery device, and further improves the grouping efficiency of the battery device. In addition, the improved design also optimizes the assembly process, reduces the complexity and potential risks caused by stacking installation.

[0181] The specific implementation is as follows:

[0182] The battery device is composed of an upper cover, a plurality of battery monomers 20, a tray 12, a plurality of busbar components 30, and other system structural and electrical components (other components and electrical components unrelated to the embodiments of the present application are not shown in detail in the figure). Among them, the battery monomer 20 is the core energy storage unit of the battery device, a plurality of battery monomers 20 are installed inside the tray 12 according to a predetermined arrangement, and a predetermined spacing is provided between adjacent groups of battery monomers 20 to meet the assembly and heat dissipation requirements. The busbar component 30 is installed on the top pole of the battery monomer 20, and the pole and the busbar are effectively electrically connected through the laser welding process to meet the overcurrent and strength requirements. In the embodiments of the present application, the face composed of the width direction and the height direction of the battery monomer 20 is defined as the large face, the face composed of the thickness direction and the height direction of the battery monomer 20 is defined as the side face, and the side with the pole in the face composed of the width direction and the thickness direction of the battery monomer 20 is defined as the top face, and the side without the pole is defined as the bottom face.

[0183] The scheme provided by the embodiments of the present application fixes a plurality of busbar components 30 in the welding area of the electrode terminal 24 of the battery monomer 20 through laser welding by innovative design. In order to optimize the space utilization and improve the grouping efficiency, the embodiments of the present application adopt the sinking design of the welding area.

[0184] Specifically, the welding area is designed as a sinking structure, so that the thickness of the busbar component 30 matches the thinned part of the electrode terminal 24. This design allows the installation and electrical connection of the busbar component 30 without increasing the overall height. The sinking depth of the welding area is 1-2 mm, and the thickness of the busbar component 30 is designed to be 1-2 mm. Through this ingenious design, the height of the busbar component 30 is hidden, and the overall system height only increases by the thinned part of the electrode terminal 24, about 1-2 mm. Compared with the traditional stacking installation method, the scheme provided by the embodiments of the present application significantly reduces the system height, thereby improving the space utilization and grouping efficiency.

[0185] It should be particularly pointed out that the busbar component 30 in the embodiments of the present application not only contains an aluminum bar for electrical connection, but also integrates a variety of functional modules, such as voltage sampling modules and temperature sampling modules. However, the specific structure and function of these modules are not within the protection scope of the present application, and therefore the relevant details are not shown in detail in the figure.

[0186] The busbar component 30 not only realizes the electrical connection function, but also integrates voltage sampling and temperature sampling modules (the specific structure and function are not within the protection scope of the present application), and at the same time, through the structural optimization of the top cover assembly, the stable and reliable connection between the electrode terminal 24 and the busbar component 30 is ensured.

[0187] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present 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 by, The battery cell and the busbar component, the battery cell has a plurality of battery cells, a plurality of battery cells are connected through the busbar component, the battery cell includes a first wall and an electrode terminal, the first wall has a first side and a second side arranged opposite in a first direction, the busbar component is arranged on the first side of the first wall, the electrode terminal includes a first part and a second part arranged and connected in a second direction, the first part is located on the first side of the first wall and is arranged and connected with the first wall in a stack, at least part of the second part is arranged and connected with the busbar component in a stack, and at least the part of the second part connected with the busbar component is arranged in the first wall, the first side surface of at least the part of the second part connected with the busbar component is lower than the first side surface of the first part, and the second direction is arranged at an angle with the first direction. The first side surface of the first wall is provided with a first accommodating groove, and at least the part of the second part for connecting with the busbar component is arranged in the first accommodating groove.

2. The battery device of claim 1, wherein The side wall of the first accommodating groove is provided with a second accommodating groove, the second accommodating groove is communicated with the first accommodating groove, at least part of the side wall of the second part is provided with a first protrusion, at least part of the first protrusion is inserted into the second accommodating groove, the first side surface of the second accommodating groove is arranged at intervals with the first side surface of the first wall, and a blocking structure is formed between the two, the blocking structure is used to prevent the first protrusion from being pulled out of the second accommodating groove.

3. The battery device of claim 2, wherein The first protrusion is arranged around at least part of the second part.

4. The battery device of claim 1, wherein The first side surface of the first wall is further provided with a third accommodating groove, and at least part of the first part is arranged in the third accommodating groove.

5. The battery device of claim 4, wherein The third accommodating groove and the first accommodating groove are communicated to form a combined groove.

6. The battery device of claim 5, wherein The first wall includes a metal piece and a first insulating piece arranged in sequence in the first direction, the first insulating piece is arranged on the second side of the metal piece, the battery cell further includes a second insulating piece arranged between the metal piece and the electrode terminal, the shape of the second insulating piece is matched with the shape of the electrode terminal, and at least part of the second insulating piece is arranged in the combined groove.

7. The battery device of claim 6, wherein The side wall of the first accommodating groove is provided with a second accommodating groove, the second accommodating groove is communicated with the first accommodating groove, at least part of the side wall of the second part is provided with a first protrusion, the second insulating piece is provided with a second protrusion corresponding to the first protrusion, the second protrusion covers the first protrusion, the second protrusion and the first protrusion form a protrusion assembly, at least part of the protrusion assembly is inserted into the second accommodating groove, the first side surface of the second accommodating groove is arranged at intervals with the first side surface of the first wall, and a blocking structure is formed between the two, the blocking structure is used to prevent the protrusion assembly from being pulled out of the second accommodating groove.

8. The battery device of claim 1, wherein, In the first direction, the size of the first accommodating groove is 0.5mm-1.5mm.

9. The battery device of any one of claims 1-8, wherein, In the first direction, the size of at least the part of the second part connected with the busbar component is smaller than the size of the first part.

10. The battery device of any one of claims 1-8, wherein, In the first direction, the size of at least the portion of the second part for connecting with the busbar component is 0.5mm-1mm smaller than the size of the first part.

11. The battery device of any one of claims 1-8, wherein, In the first direction, the size of the combined structure of the first wall, the busbar component and the electrode terminal is less than or equal to the sum of the sizes of the first wall and the electrode terminal.

12. The battery device of any one of claims 1-8, wherein, The first side of the first part is in the same plane as the first side of the busbar component.

13. The battery device of any one of claims 1-8, wherein, The second side of the second part is spaced apart from the second side of the first part in the first direction, and the second side of the second part is disposed close to the second side of the first wall.

14. The battery device of any one of claims 1-8, wherein, The electrode terminal is a one-piece component.

15. The battery device of any one of claims 1-8, wherein, The first part is riveted to the first wall.

16. The battery device of claim 15, wherein, The first part is sealingly connected to the first wall.

17. An electrical device, comprising: A battery device comprising any of the features of claims 1-16.

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