Battery device and electric device

Abstract

The utility model relates to a battery device and a power utilization device. The battery device comprises a battery monomer, a first circuit board and a sampling assembly, the first circuit board is arranged on one side of the battery monomer and is provided with an accommodating part; the sampling assembly comprises a second circuit board and a temperature detection piece, at least part of the temperature detection piece is arranged in the containing part and fixed to the first circuit board, the second circuit board is arranged on the side, facing the battery single bodies, of the first circuit board and connected with the first circuit board, and the second circuit board is used for connecting the battery single bodies and the temperature detection piece. According to the battery device provided by the invention, the structure of the first circuit board is used for protecting the temperature detection piece, and the assembly stability of the temperature detection piece is improved, so that the detection accuracy of the sampling assembly is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to battery devices and electrical devices. Background Art

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Batteries may include nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion batteries, and secondary alkaline zinc-manganese batteries, etc.

[0003] In order to improve the reliability of the battery device, it is necessary to monitor the status of the battery cells through a sampling component. How to improve the detection accuracy of the battery cells by the sampling component is a technical problem that needs to be solved in the battery device. Utility Model Content

[0004] The present application provides a battery device and an electrical device, which aim to improve the detection accuracy of a sampling component to a certain extent.

[0005] In the first aspect, the present application proposes a battery device, which includes a battery cell, a first circuit board, and a sampling assembly. The first circuit board is arranged on one side of the battery cell, and the first circuit board is provided with a receiving portion. The sampling assembly includes a second circuit board and a temperature detection member, at least part of the temperature detection member is arranged in the receiving portion and fixed to the first circuit board, the second circuit board is arranged on the side of the first circuit board facing the battery cell and connected to the first circuit board, and the second circuit board is used to connect the battery cell and the temperature detection member.

[0006] The battery device provided by the present application has a temperature detection member arranged in the receiving portion of the first circuit board and fixedly connected to the first circuit board, and a second circuit board connecting the battery cell and the temperature detection member and fixedly connected to the first circuit board, that is, the second circuit board can simultaneously realize the sampling and transmission of temperature information, and the temperature detection member directly connected to the second circuit board is also arranged in the receiving portion of the first circuit board, so as to utilize the structure of the first circuit board to protect the temperature detection member, thereby improving the assembly efficiency of the second circuit board and the temperature detection member, and improving the assembly stability of the temperature detection member, thereby improving the detection accuracy of the sampling assembly. Moreover, the second circuit board can face the battery cell, further reducing the distance between the temperature detection member and the battery cell, so that the temperature measurement is fast and the detection accuracy is high.

[0007] According to one embodiment of the present application, the accommodating portion includes a groove, which is recessed relative to the surface of the first circuit board facing the second circuit board, and the temperature detecting element is at least partially disposed in the groove and fixedly connected to the groove wall of the groove.

[0008] In these optional embodiments, the temperature detection component is at least partially disposed in the groove and fixedly connected to the groove wall of the groove, which not only can effectively protect the temperature detection component, but also can reduce the space occupied by the temperature detection component, thereby effectively reducing the overall height of the sampling assembly and improving the battery energy density.

[0009] According to an embodiment of the present application, the accommodating portion includes a through hole, which passes through the first circuit board in a thickness direction, and the temperature detecting element is at least partially disposed in the through hole and fixedly connected to a hole wall of the through hole.

[0010] In these optional embodiments, the temperature detection component is at least partially disposed in the through hole and fixedly connected to the hole wall of the through hole, thereby reducing the space occupied by the temperature detection component, thereby effectively reducing the overall height of the sampling assembly and improving the battery energy density.

[0011] According to an embodiment of the present application, the first circuit board and the second circuit board are welded to form at least two welding points.

[0012] In these optional embodiments, the first circuit board and the second circuit board are connected via solder joints to transmit temperature information to the first circuit board.

[0013] According to one embodiment of the present application, the second circuit board includes a first base portion and a second base portion. The temperature detection member is fixed to the first base portion. The second base portion is connected to the first base portion, the second base portion is protruded relative to the first base portion along a first direction, the solder joint is connected to the second base portion, and the first direction is perpendicular to the thickness direction of the first circuit board.

[0014] In these optional embodiments, the temperature detection components and solder joints are distributed on different base parts, and the second base part is protruded, which can more reasonably utilize the space of the second circuit board and disperse the stress on the solder joints to a certain extent.

[0015] According to an embodiment of the present application, the second circuit board includes two second base parts that are spaced apart from each other, and each second base part is provided with at least one soldering point.

[0016] In these optional embodiments, such an arrangement can improve the connection stability between the first circuit board and the second circuit board.

[0017] According to an embodiment of the present application, the two second base parts are arranged on two opposite sides of the first base part.

[0018] According to one embodiment of the present application, the sampling component further includes a connecting layer, which is disposed between the first substrate and the first circuit board, and the first substrate portion is connected to the first circuit board through the connecting layer, and the connecting layer avoids the temperature detection component.

[0019] In these alternative embodiments, the second circuit board is connected to the first circuit board through a connection layer and is attached to the first circuit board. During the process of cyclic charge and discharge of the battery cell, it is inevitable to generate a certain degree of shrinkage or expansion. Therefore, the second circuit board can be attached to the first circuit board to transfer the acting force to the first circuit board, thereby reducing the acting force received by the second circuit board, that is, improving the overall structural stability of the battery device.

[0020] According to an embodiment of the present application, the battery device further includes an insulating adhesive, and at least a part of the insulating adhesive is disposed in the accommodating portion and bonds the temperature detecting member to the first circuit board.

[0021] In these alternative embodiments, the insulating adhesive is filled in the accommodating portion and encapsulates the temperature detecting member to reduce the influence of the external environment on the temperature detecting member.

[0022] According to an embodiment of the present application, a part of the insulating adhesive is located in the accommodating portion and covers the outer surface of the temperature detecting member, and another part of the insulating adhesive is located between the first circuit board and the second circuit board.

[0023] In these alternative embodiments, the insulating adhesive can not only protect the temperature detecting member but also enhance the connection strength between the first circuit board and the second circuit board.

[0024] According to an embodiment of the present application, along the direction from the battery cell to the first circuit board, the insulating adhesive does not protrude from the surface of the first circuit board away from the battery cell.

[0025] In these alternative embodiments, such a setting reduces the interference of the insulating adhesive and saves space.

[0026] According to an embodiment of the present application, the sampling assembly further includes a reinforcing plate, and the reinforcing plate is disposed on the side of the second circuit board away from the temperature detecting member, and the reinforcing plate is connected to the second circuit board.

[0027] In these alternative embodiments, the reinforcing plate can strengthen the structural strength of the second circuit board and can further effectively release the expansion or vibration pulling force received at the position of the temperature detecting member.

[0028] According to an embodiment of the present application, in the thickness direction of the first circuit board, the projection of the accommodating portion on the first circuit board is located within the projection of the reinforcing plate on the first circuit board.

[0029] In these alternative embodiments, such a setting can enhance the connection strength between the temperature detecting member and the second circuit board and protect the temperature detecting member.

[0030] According to an embodiment of the present application, the battery device further includes a busbar, and the busbar is connected to the first circuit board and the battery cell.

[0031] According to an embodiment of the present application, in the thickness direction of the first circuit board, the projection of the bus bar on the second circuit board does not overlap with the projection of the sampling component on the second circuit board.

[0032] In these alternative embodiments, with such an arrangement, it is possible to reduce the interference of the magnetic field generated by the bus bar on the sampling component, so as to maintain the normal operation of the sampling component. Moreover, when the bus bar is operating, since a relatively large current passes through it, heat will be generated. Therefore, it is possible to reduce the influence of the bus bar on the detection accuracy of the sampling component.

[0033] According to an embodiment of the present application, the first circuit board includes a printed circuit board.

[0034] According to an embodiment of the present application, the second circuit board includes a flexible circuit board.

[0035] In a second aspect, the present application provides an electrical device, including the battery device described above, and the battery device is used to store or provide electrical energy.

[0036] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other objects, features, and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the drawings.

[0038] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0039] Figure 2 is a schematic structural diagram of a battery device provided by an embodiment of the present application;

[0040] Figure 3 is a partial schematic structural diagram of a battery device provided by an embodiment of the present application;

[0041] Figure 4 is a partial schematic structural diagram of a battery device provided by another embodiment of the present application;

[0042] Figure 5 is a schematic structural diagram of the first circuit board of a battery device provided by an embodiment of the present application;

[0043] Figure 6 is a schematic structural diagram of the sampling component of a battery device provided by an embodiment of the present application;

[0044] Figure 7 A cross-sectional view of a battery device provided by an embodiment of the present application;

[0045] Figure 8 is a partial top view of the battery device provided by an embodiment of the present application;

[0046] Figure 9 is a partial bottom view of the battery device provided by an embodiment of the present application;

[0047] Figure 10 is a partial top view of the battery device provided by another embodiment of the present application;

[0048] Figure 11 is a partial top view of the battery device provided by still another embodiment of the present application;

[0049] Figure 12 is a partial top view of the battery device provided by yet another embodiment of the present application.

[0050] The drawings are not necessarily drawn to actual scale.

[0051] Explanation of reference numerals:

[0052] 1000, vehicle;

[0053] 100, battery device; 200, controller; 300, motor;

[0054] 10, battery cell; 20, first box body; 30, second box body;

[0055] 40, first circuit board; 41, accommodating part;

[0056] 50, sampling component; 51, second circuit board; 511, first base part; 512, second base part; 52, temperature detection part; 53, connection layer; 54, reinforcing plate;

[0057] 60, solder joint;

[0058] 70, insulating glue;

[0059] 80, bus bar;

[0060] 90, chip; 91, connector;

[0061] x, thickness direction; y, first direction. Detailed implementation manners

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without any creative effort belong to the scope of protection of this application.

[0063] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0064] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0065] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0067] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings in the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to this application.

[0068] In this application, "a plurality of" means two or more (including two).

[0069] In the battery device, the temperature of the battery cell is detected by a temperature detection component to monitor the state of the battery cell. In some embodiments, the temperature detection component is usually fixed to the circuit board, but the connection stability between the temperature detection component and the circuit board is poor, which affects the detection accuracy of the temperature detection component. The above statements are only used to provide background technical information related to this application and do not necessarily constitute prior art.

[0070] In the battery device provided by this application, the temperature detection component is disposed in the accommodation part of the first circuit board and fixedly connected to the first circuit board. The second circuit board is connected to the battery cell and the temperature detection component and is fixedly connected to the first circuit board. That is, the second circuit board can simultaneously implement sampling and transmission of temperature information. The temperature detection component directly connected to the second circuit board is also disposed in the accommodation part of the first circuit board to protect the temperature detection component by using the structure of the first circuit board, improving the assembly efficiency of the second circuit board and the temperature detection component, and improving the assembly stability of the temperature detection component, thereby improving the detection accuracy of the sampling component. The battery device of this application will be described in detail below.

[0071] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0072] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with a cable tie.

[0073] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0074] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0075] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0076] In the embodiments of this application, the battery cell may be a secondary battery cell, and the secondary battery cell refers to a battery cell that can be activated by charging after discharging and can continue to be used.

[0077] The battery cell may include, but is not limited to, a solid-state battery, a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0078] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no particular limitation in this application.

[0079] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, part of the box body may become at least part of the floor of the vehicle, or part of the box body may become at least part of the cross beam and longitudinal beam of the vehicle.

[0080] In some embodiments, the battery device may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0081] The battery device disclosed in the embodiments of this application can be used in electrical equipment that uses the battery device as a power source or various energy storage systems that use the battery device as an energy storage element. The electrical equipment may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0082] For the convenience of description, the following embodiments will be described by taking a vehicle as an example of an electrical device in an embodiment of this application.

[0083] See Figure 1As shown, an embodiment of the present application provides a vehicle 1000. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. In an embodiment of the present application, the vehicle 1000 can include a motor 300, a controller 200, and a battery device 100. The controller 200 is used to control the battery device 100 to supply power to the motor 300. The motor 300 is connected to the wheels through a transmission mechanism, so as to drive the vehicle 1000 to travel. The battery device 100 can be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000. In one example, the battery device 100 can be arranged at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. In one example, the battery device 100 can be used as the operating power source of the vehicle 1000 and is used for the circuit system of the vehicle 1000. Exemplarily, the battery device 100 can be used for the starting, navigation, and working power consumption requirements during the operation of the vehicle 1000.

[0084] Please refer to Figure 2 , Figure 2 is an exploded view of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body and battery cells 10. In some embodiments, the box body can include a first box body 20 and a second box body 30. The first box body 20 and the second box body 30 cover each other, and the first box body 20 and the second box body 30 jointly define an accommodation space for accommodating the battery cells 10. The second box body 30 can be a hollow structure with one end open, and the first box body 20 can be a plate-like structure. The first box body 20 covers the open side of the second box body 30, so that the first box body 20 and the second box body 30 jointly define the accommodation space; the first box body 20 and the second box body 30 can also both be hollow structures with one side open, and the open side of the first box body 20 covers the open side of the second box body 30. Of course, the box body formed by the first box body 20 and the second box body 30 can be of various shapes, such as a cylinder, a cuboid, etc.

[0085] In the battery device 100, there can be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the multiple battery cells 10 is accommodated in the box body; of course, the battery device 100 can also be that multiple battery cells 10 are first connected in series, in parallel, or in a series-parallel combination to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box body. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing the electrical connection among the multiple battery cells 10.

[0086] Each battery cell 10 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this.

[0087] The battery cell 10 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0088] Refer to Figures 3 to 6 , Figure 3 which is a partial structural schematic diagram of a battery device provided by an embodiment of the present application; Figure 4 which is a partial structural schematic diagram of a battery device provided by another embodiment of the present application; Figure 5 which is a structural schematic diagram of the first circuit board of a battery device provided by an embodiment of the present application; Figure 6 which is a structural schematic diagram of the sampling component of a battery device provided by an embodiment of the present application.

[0089] As Figures 3 to 6 shown, the present application proposes a battery device, which includes a battery cell 10, a first circuit board 40 and a sampling component 50. The first circuit board 40 is disposed on one side of the battery cell 10, and the first circuit board 40 is provided with a receiving portion 41. The sampling component 50 includes a second circuit board 51 and a temperature detection component 52. At least a part of the temperature detection component 52 is disposed in the receiving portion 41 and fixed to the first circuit board 40. The second circuit board 51 is disposed on the side of the first circuit board 40 facing the battery cell 10 and connected to the first circuit board 40. The second circuit board 51 is used to connect the battery cell 10 and the temperature detection component 52.

[0090] Exemplarily, the number of battery cells 10 can be multiple. The multiple battery cells 10 can be directly connected in series, in parallel or in a hybrid connection together, and then the battery cell group formed by the multiple battery cells 10 is accommodated in a box body; of course, it can also be that multiple battery cells 10 are first connected in series, in parallel or in a hybrid connection to form a battery cell group, and then multiple battery cell groups are connected in series, in parallel or in a hybrid connection to form a whole and accommodated in a box body. The battery cell group includes multiple battery cells 10 stacked in a direction. The multiple battery cells 10 can be connected in series, in parallel or in a hybrid connection. The hybrid connection means that there are both series and parallel connections among the multiple battery cells 10. The battery cell group can be one or multiple. If there are multiple battery cell groups, the multiple battery cell groups can be disposed in another direction.

[0091] A circuit board is a substrate used to support and connect electronic components, for assembling and wiring electronic components so that the circuit can operate properly. In some examples, the circuit board includes one or more layers of insulating material and is provided with a layer of conductive parts. During the manufacturing process, the conductive parts on the circuit board are removed from the unnecessary parts by methods such as chemical etching or machining according to the design pattern, to form the required conductive lines and pads. The conductive lines and pads are used to connect various electronic components, such as resistors, capacitors, integrated circuits and other electronic components.

[0092] In the embodiments of the present application, the first circuit board 40 and the second circuit board 51 can have various shapes, such as regular shapes like rectangles, squares, circles, etc., or other irregular shapes.

[0093] Specifically, both the second circuit board 51 and the sampling component 50 in the sampling component 50 are connected to the first circuit board 40. Therefore, the first circuit board 40 needs to have a certain structural strength to support the sampling component 50 and other components.

[0094] Optionally, the battery device includes a plurality of sampling components 50, and the sampling components 50 are arranged at intervals along the extending direction of the first circuit board 40.

[0095] In the embodiments of the present application, by using the second circuit board 51 instead of the sampling wire, surface mounting can also be performed simultaneously to realize the connection between the sampling component 50 and the first circuit board 40, canceling the multiple spot welding steps required for using the sampling wire. Industrial automation is simple and the cost is low. In addition, according to the actual position of the sampling point, the length of the second circuit board 51 can be designed by stamping to realize sampling at different sampling point positions, meeting the use requirements of a larger sampling range.

[0096] The sampling component 50 is configured to be able to collect the operating parameters of the battery. Specifically, the temperature detection component 52 of the sampling component 50 can collect the temperature operating parameters of the battery device during operation.

[0097] Exemplarily, the temperature detection component 52 is electrically connected to the electrode terminal and other structures of the battery cell 10 through the second circuit board 51 to collect operating parameters such as the current of the battery, and then transmits the signal detected by the temperature detection component 52 to the first circuit board 40 through the second circuit board 51.

[0098] In the embodiments of the present application, the temperature detection component 52 includes a thermistor, a thermocouple, a thermal resistor, or a temperature sensor chip, etc.

[0099] Optionally, the temperature detection component 52 includes an NTC thermistor. The thermistor is a common negative temperature coefficient thermistor, whose resistance value decreases as the temperature increases. It has the advantages of high sensitivity, fast response speed, low cost, etc., and can be applied to the temperature detection of various batteries.

[0100] In the embodiment of the present application, at least a part of the temperature detection component 52 is disposed in the accommodation part 41 and fixed to the first circuit board 40. There are various fixing methods for the temperature detection component 52. The temperature detection component 52 can be directly connected to the first circuit board 40, such as by soldering, etc. The temperature detection component 52 can also be indirectly connected to the first circuit board 40, that is, the temperature detection component 52 is connected to the first circuit board 40 through a connecting member, such as a snap member or an adhesive, etc.

[0101] In the embodiment of the present application, the second circuit board 51 is disposed on the side of the first circuit board 40 facing the battery cell 10 and connected to the first circuit board 40. Exemplarily, the second circuit board 51 includes a first surface and a second surface that are oppositely arranged along its own thickness direction x. The first surface is the side facing the battery cell 10, and the second surface is the side facing the first circuit board 40. The temperature detection component 52 is disposed on the second surface and connected to the second surface. The second surface can also be connected to the first circuit board 40. The first surface is used to connect the battery cell 10.

[0102] In the battery device provided by the present application, the temperature detection component 52 is disposed in the accommodation part 41 of the first circuit board 40 and fixedly connected to the first circuit board 40. The second circuit board 51 connects the battery cell 10 and the temperature detection component 52, and is fixedly connected to the first circuit board 40. That is, the second circuit board 51 can simultaneously realize the sampling and transmission of temperature information. The temperature detection component 52 directly connected to the second circuit board 51 is also disposed in the accommodation part 41 to protect the temperature detection component 52 by using the structure of the first circuit board 40. This not only improves the assembly efficiency of the second circuit board 51 and the temperature detection component 52, but also improves the assembly stability of the temperature detection component 52, thereby improving the detection accuracy of the sampling component 50. Moreover, the second circuit board 51 can face the battery cell 10, further reducing the distance between the temperature detection component 52 and the battery cell 10, with fast temperature measurement accompaniment and high detection accuracy.

[0103] According to an embodiment of the present application, the accommodation part 41 includes a groove that is recessed with respect to the surface of the first circuit board 40 facing the second circuit board 51. At least a part of the temperature detection component 52 is disposed in the groove and fixedly connected to the groove wall of the groove.

[0104] The accommodation part 41 is recessed with respect to the surface of the first circuit board 40 facing the second circuit board 51. At least a part of the temperature detection component 52 is disposed in the groove to integrate the temperature detection component 52 into the first circuit board 40 and reduce the space occupied by the temperature detection component 52.

[0105] Specifically, the structure of the groove can be a rectangular structure, a rhombic structure, a triangular structure, a cylindrical structure, an annular structure, or other shaped structures, etc.

[0106] The accommodating portion 41 includes one groove or a plurality of grooves. In the case where the accommodating portion 41 includes a plurality of grooves, the plurality of grooves are arranged at intervals.

[0107] Exemplarily, the accommodating portion 41 includes a plurality of grooves, and the plurality of grooves are evenly distributed at intervals.

[0108] In these alternative embodiments, the temperature detection member 52 is at least partially disposed in the groove and fixedly connected to the groove wall, which can not only effectively protect the temperature detection member 52, but also reduce the space occupied by the temperature detection member 52, thereby effectively reducing the overall height of the sampling assembly 50 and increasing the battery energy density.

[0109] According to another embodiment of the present application, the accommodating portion 41 includes a through hole that penetrates along the thickness direction x of the first circuit board 40, and the temperature detection member 52 is at least partially disposed in the through hole and fixedly connected to the hole wall of the through hole.

[0110] In the embodiments of the present application, the accommodating portion 41 includes a through hole, and the temperature detection member 52 is at least partially disposed in the through hole and fixedly connected to the hole wall of the through hole. On the one hand, the through hole is convenient for processing; on the other hand, it is also convenient for the installation of the temperature detection member 52. Moreover, when the battery cell 10 is thermally out of control, the through hole can realize the condensation and directional collection of the conductive electrolyte and the thermally out-of-control products.

[0111] In these alternative embodiments, the temperature detection member 52 is at least partially disposed in the through hole and fixedly connected to the hole wall of the through hole, reducing the space occupied by the temperature detection member 52 to effectively reduce the overall height of the sampling assembly 50 and increase the battery energy density.

[0112] Referring to Figure 7 , Figure 7 A cross-sectional view of a battery device provided by an embodiment of the present application.

[0113] According to an embodiment of the present application, as Figures 5 to 7 shown, the first circuit board 40 and the second circuit board 51 are welded to form at least two solder joints 60.

[0114] Specifically, the first circuit board 40 and the second circuit board 51 are welded to form a first solder joint and a second solder joint.

[0115] In these alternative embodiments, the first circuit board 40 and the second circuit board 51 are electrically connected through the solder joint 60 to transmit the temperature information onto the first circuit board 40.

[0116] According to an embodiment of the present application, as Figure 6 and Figure 7 shown, the second circuit board 51 includes a first base portion 511 and a second base portion 512. The temperature detection component 52 is fixed to the first base portion 511. The second base portion 512 is connected to the first base portion 511, and the second base portion 512 protrudes from the first base portion 511 along a first direction y, and the solder joint 60 is connected to the second base portion 512. The first direction y is perpendicular to the thickness direction x.

[0117] In an embodiment of the present application, the second circuit board 51 includes a first base portion 511 and a second base portion 512. The first base portion 511 is connected to the second base portion 512, and the first base portion 511 and the second base portion 512 are arranged side by side in the horizontal direction.

[0118] Exemplarily, the first base portion 511 includes a first conductive circuit and a first pad, the second base portion 512 includes a second conductive circuit and a second pad. Windows are opened at the connection position between the first base portion 511 and the temperature detection component 52 to expose the first pad. The temperature detection component 52 is connected to the first conductive circuit through the first pad. Windows are opened at the connection position between the second base portion 512 and the first circuit board 40 to expose the second pad. The second base portion 512 and the first circuit board 40 are soldered at the second pad to form the solder joint 60, and the first circuit board 40 and the second circuit board 51 are electrically connected.

[0119] In an embodiment of the present application, the first base portion 511 is used to support the temperature detection component 52, cover the groove or through hole on the first circuit board 40, and the first base portion 511 can also be attached to the first circuit board 40.

[0120] Specifically, the first base portion 511 includes a connected first sub-portion and a second sub-portion. The first sub-portion covers the groove or through hole on the first circuit board 40. The temperature detection component 52 is connected to the first sub-portion. The second sub-portion surrounds the first sub-portion, and the second sub-portion is attached to the first circuit board 40.

[0121] In these alternative embodiments, distributing the temperature detection component 52 and the solder joint 60 on different base portions and making the second base portion 512 protrude can more reasonably utilize the space of the second circuit board 51 and can also disperse the stress borne by the solder joint 60 to a certain extent.

[0122] Referring to Figures 8 to 12 , Figure 8 is a partial top view of the structure of a battery device provided by an embodiment of the present application; Figure 9 is a partial bottom view of the structure of a battery device provided by an embodiment of the present application; Figure 10 is a partial top view of the structure of a battery device provided by another embodiment of the present application; Figure 11It is a partial top view of the structure of the battery device provided by another embodiment of the present application; Figure 12 It is a partial top view of the structure of the battery device provided by still another embodiment of the present application.

[0123] According to an embodiment of the present application, as Figures 8 to 12 shown, the second circuit board 51 includes two second base parts 512 arranged at intervals, and each second base part 512 is provided with at least one solder joint 60.

[0124] Specifically, the second base part 512 protrudes from the first base part 511 along the first direction y. The second circuit board 51 includes one second base part 512 or multiple second base parts 512. In the case of including one second base part 512, multiple solder joints 60 are all arranged on one second base. In the case of including multiple second base parts 512, the multiple second base parts 512 can be arranged on the same side of the first base part 511, and the second base parts 512 on the same side are arranged at intervals, or can be on different sides. Each second base part 512 is provided with at least one solder joint 60.

[0125] Exemplarily, the second circuit board 51 includes a first base part 511 and two second base parts 512. The second base part 512 protrudes from the first base part 511 along the first direction y, and the two second base parts 512 are located on the same side of the first base part 511 and arranged at intervals.

[0126] Exemplarily, the second circuit board 51 includes a first base part 511 and two second base parts 512. The second base part 512 protrudes from the first base part 511 along the first direction y, and the two second base parts 512 are located on two adjacent sides of the first base part 511 and are vertically arranged.

[0127] In these alternative embodiments, with such an arrangement, the connection stability between the first circuit board 40 and the second circuit board 51 can be improved.

[0128] According to an embodiment of the present application, as Figure 12 shown, the two second base parts 512 are arranged on opposite sides of the first base part 511.

[0129] Exemplarily, the first base part 511 has a rectangular structure with a predetermined length and width, and the two second base parts 512 are arranged on both sides in the width direction and are oppositely arranged.

[0130] According to an embodiment of the present application, as Figure 6 and Figure 7As shown, the sampling component 50 also includes a connection layer 53 , which is disposed between the first base portion 511 and the first circuit board 40 , and the first base portion 511 is connected to the first circuit board 40 through the connection layer 53 , and the connection layer 53 avoids the temperature detection component 52 .

[0131] In an embodiment of the present application, the first circuit board 40 and the second circuit board 51 can be connected and connected through a solder joint 60. In order to achieve the connection stability of the first circuit board 40 and the second circuit board 51, a connecting layer 53 is arranged between the first base portion 511 and the first circuit board 40 to temperature-adhere the second circuit board 51 to the first circuit board 40.

[0132] Optionally, the connection layer 53 includes a layer of insulating glue 70 .

[0133] In these optional embodiments, the second circuit board 51 is connected to the first circuit board 40 through the connecting layer 53 so as to be adhered to the first circuit board 40. During the process of cyclic charge and discharge, the battery cell 10 will inevitably produce a certain degree of contraction or expansion. Therefore, the second circuit board 51 can be adhered to the first circuit board 40 and transfer the force to the first circuit board 40, thereby reducing the force on the second circuit board 51, that is, improving the overall structural stability of the battery device.

[0134] According to one embodiment of the present application, Figure 6 and Figure 7 As shown, the battery device further includes an insulating adhesive 70 , at least a portion of which is disposed in the receiving portion 41 and bonds the temperature detecting element 52 to the first circuit board 40 .

[0135] Exemplarily, the first circuit board 40 is provided with a through hole passing through along the thickness direction x, the second circuit board 51 includes a first base portion 511 and a second base portion 512, and a temperature detection component 52 is provided on the surface of the first base portion 511 facing the first circuit board 40. The first base is bonded to the first circuit board 40 by insulating glue 70 to fix the second circuit board 51 on the first circuit board 40, and the temperature detection component 52 is embedded in the through hole. The first circuit board 40 and the second base portion 512 are welded to form a solder joint 60, and then the insulating glue 70 is added into the through hole to seal the temperature detection component 52.

[0136] In these optional embodiments, the insulating glue 70 is filled in the accommodating portion 41 and encapsulates the temperature detecting element 52 to reduce the influence of the external environment on the temperature detecting element 52 .

[0137] According to an embodiment of the present application, a portion of the insulating adhesive 70 is located in the accommodating portion 41 and covers the outer surface of the temperature detecting member 52 , and another portion of the insulating adhesive 70 is located between the first circuit board 40 and the second circuit board 51 .

[0138] In an embodiment of the present application, a part of the insulating adhesive 70 covers the outer surface of the temperature detection member 52 and bonds the temperature detection member 52 to the first circuit board 40, and another part fills the gap between the first circuit board 40 and the second circuit board 51 to connect the first circuit board 40 and the second circuit board 51.

[0139] In these alternative embodiments, the insulating adhesive 70 can both protect the temperature detection member 52 and enhance the connection strength between the first circuit board 40 and the second circuit board 51.

[0140] According to an embodiment of the present application, as Figure 6 and Figure 7 shown, along the direction from the battery cell 10 to the first circuit board 40, the insulating adhesive 70 does not protrude from the surface of the first circuit board 40 away from the battery cell 10.

[0141] In these alternative embodiments, by setting it like this, the interference of the insulating adhesive 70 is reduced and space is saved.

[0142] According to an embodiment of the present application, the sampling assembly 50 further includes a reinforcing plate 54. The reinforcing plate 54 is disposed on the side of the second circuit board 51 away from the temperature detection member 52, and the reinforcing plate 54 is connected to the second circuit board 51.

[0143] In the related art, the temperature detection member 52 is fixedly connected to the second circuit board 51. In order to improve the connection stability of the temperature detection member 52, it is usually necessary to provide reinforcing plates 54 on both sides of the second circuit board 51, and insulating adhesives 70 connecting the reinforcing plates 54 and the temperature detection member 52. In this way, the additional reinforcing plates 54 and insulating adhesives 70 make the distance between the temperature detection member 52 and the battery cell 10 relatively far. Therefore, by fixing the temperature detection member 52 in the first circuit board 40, the use of one reinforcing plate 54 and insulating adhesive 70 is saved, which not only saves the process and reduces the cost, but also reduces the distance between the temperature detection member 52 and the battery cell 10.

[0144] Specifically, the second circuit board 51 includes a first base portion 511 and a second base portion 512. The first base portion 511 has a first base surface and a second base surface opposite to each other in the thickness direction x. The first base surface faces the first circuit board 40, and the second base surface faces the battery cell 10. The temperature detection member 52 is disposed on the first base surface, and the reinforcing plate 54 is disposed on the second base surface.

[0145] Optionally, in the thickness direction x, the projection of the reinforcing plate 54 and the projection of the temperature detection member 52 at least partially overlap.

[0146] In these alternative embodiments, the reinforcing plate 54 can strengthen the structural strength of the second circuit board 51 and can further effectively release the expansion or vibration pulling force applied at the position of the temperature detection component 52.

[0147] According to an embodiment of the present application, as Figure 6 and Figure 7 shown, in the thickness direction x of the first circuit board 40, the projection of the accommodating portion 41 on the second circuit board 51 is located within the projection of the reinforcing plate 54 on the second circuit board 51.

[0148] In these alternative embodiments, by setting it in this way, the connection strength between the temperature detection component 52 and the second circuit board 51 can be enhanced to protect the temperature detection component 52.

[0149] According to an embodiment of the present application, as Figure 4 shown, the battery device further includes a bus bar 80, and the bus bar 80 is connected to the first circuit board 40 and the battery cell 10.

[0150] In the embodiment of the present application, the electrode terminals of the plurality of battery cells 10 arranged in the battery are connected in series / parallel through a plurality of bus bars 80, and the first circuit board 40 is correspondingly electrically connected to the bus bars 80 to collect the voltage of the corresponding battery cell 10 and monitor the state of the battery cell 10. The first circuit board 40 can be directly connected to the bus bar 80, and the first circuit board 40 can also use a transition connecting member, usually a nickel sheet, to be electrically connected to the bus bar 80.

[0151] Specifically, the battery device further includes a plurality of bus bars 80, and the plurality of bus bars 80 are arranged on both sides of the first circuit board 40 along a second direction, where the second direction is perpendicular to the extending direction of the first circuit board 40.

[0152] According to an embodiment of the present application, in the thickness direction x of the first circuit board 40, the projection of the bus bar 80 on the first circuit board 40 does not overlap with the projection of the sampling assembly 50 on the first circuit board 40.

[0153] Exemplarily, a plurality of bus bars 80 are provided on both opposite sides of the first circuit board 40 along the second direction, the plurality of bus bars 80 are arranged at intervals along the extending direction of the first circuit board 40, the first circuit board 40 is provided with a plurality of accommodating portions 41 arranged at intervals, at least one temperature detection component 52 is arranged in each accommodating portion 41, and the projection of the bus bar 80 on the first circuit board 40 does not overlap with the projection of the sampling assembly 50 on the first circuit board 40. The second direction is perpendicular to the first direction y and the thickness direction x.

[0154] In these alternative embodiments, it is arranged in such a way that the interference of the magnetic field generated by the bus bar 80 on the sampling assembly 50 can be reduced, so as to maintain the normal operation of the sampling assembly 50. Moreover, when the bus bar 80 is operating, heat will be generated due to the passage of a large current. Therefore, the influence of the bus bar 80 on the detection accuracy of the sampling assembly 50 can be reduced.

[0155] According to an embodiment of the present application, the first circuit board 40 includes a printed circuit board.

[0156] According to an embodiment of the present application, the second circuit board 51 includes a flexible circuit board.

[0157] According to an embodiment of the present application, the battery device further includes a chip 90. Optionally, the chip 90 is an AFE chip, and the AFE chip is used for signal acquisition and processing.

[0158] According to an embodiment of the present application, the battery device further includes a connector 91. The connector 91 is used to transmit electrical signals, etc. to the battery management system.

[0159] In a second aspect, the present application provides an electrical device, including the battery device described above, and the battery device is used to store or provide electrical energy.

[0160] According to some embodiments of the present application, refer to Figures 3 to 8 、 Figure 12 The present application provides a battery device, which includes a battery cell 10, a first circuit board 40, an insulating adhesive 70, a sampling assembly 50, and a bus bar 80.

[0161] The first circuit board 40 is arranged on one side of the battery cell 10, and the first circuit board 40 is provided with a receiving portion 41. The receiving portion 41 includes a through hole, and the through hole penetrates along the thickness direction x of the first circuit board 40.

[0162] The sampling component 50 includes a second circuit board 51, a temperature detector 52, a connection layer 53, and a reinforcement plate 54. The temperature detector 52 is disposed in the through hole and fixedly connected to the hole wall of the through hole. The second circuit board 51 is disposed on the side of the first circuit board 40 facing the battery cell 10 and is connected to the first circuit board 40. At least two solder joints 60 are formed by soldering the first circuit board 40 and the second circuit board 51. The second circuit board 51 is used to connect the battery cell 10 and the temperature detector 52. The second circuit board 51 includes a first base portion 511 and two second base portions 512. The temperature detector 52 is fixed to the first base portion 511. The two second base portions 512 are disposed on opposite sides of the first base portion 511. The second base portion 512 is connected to the first base portion 511, and the second base portion 512 protrudes from the first base portion 511 in the first direction y. The solder joint 60 is connected to the second base portion 512, and the first direction y is perpendicular to the thickness direction x. The connection layer 53 is disposed between the first base and the first circuit board 40, and the first base is attached to the first circuit board 40 through the connection layer 53. The connection layer 53 avoids the temperature detector 52.

[0163] A part of the insulating adhesive 70 is located in the accommodating portion 41 and covers the outer surface of the temperature detector 52, and bonds the temperature detector 52 to the first circuit board 40. Another part of the insulating adhesive 70 is located between the first circuit board 40 and the second circuit board 51.

[0164] The reinforcement plate 54 is disposed on the side of the second circuit board 51 away from the temperature detector 52, and the reinforcement plate 54 is connected to the second circuit board 51. The projection of the through hole on the first circuit board 40 is located within the projection of the reinforcement plate 54 on the first circuit board 40.

[0165] The bus bar 80 is connected to the first circuit board 40 and the battery cell 10. In the thickness direction x, the projection of the bus bar 80 on the second circuit board 51 does not overlap with the projection of the sampling component 50 on the second circuit board 51.

[0166] Wherein, the first circuit board 40 includes a printed circuit board. The second circuit board 51 includes a flexible circuit board.

[0167] Although the present application has been described with reference to the preferred embodiments, various improvements can be made thereto and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any manner. 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 in that: include: Battery cells; A first circuit board is arranged on one side of the battery cell, and the first circuit board is provided with a receiving portion; A sampling component includes a second circuit board and a temperature detection component, wherein the second circuit board is arranged on a side of the first circuit board facing the battery cell and connected to the first circuit board, and the second circuit board is used to connect the battery cell and the temperature detection component, and the accommodating portion includes a groove and / or a through hole, wherein the groove is recessed relative to the surface of the first circuit board facing the second circuit board, and the through hole passes through along the thickness direction of the first circuit board, and the temperature detection component is at least partially arranged in the groove and fixedly connected to the groove wall of the groove and / or the temperature detection component is at least partially arranged in the through hole and fixedly connected to the hole wall of the through hole.

2. The battery device according to claim 1, characterized in that: The first circuit board and the second circuit board are welded to form at least two welding points.

3. The battery device according to claim 2, characterized in that: The second circuit board comprises: a first base portion, the temperature detecting element being fixed to the first base portion; The second base part is connected to the first base part, the second base part is protruding relative to the first base part along a first direction, the solder joint is connected to the second base part, and the first direction is perpendicular to the thickness direction of the first circuit board.

4. The battery device according to claim 3, characterized in that: The second circuit board includes two second base parts which are spaced apart from each other, and each of the second base parts is provided with at least one soldering point.

5. The battery device according to claim 4, characterized in that: The two second base parts are arranged on two opposite sides of the first base part.

6. The battery device according to claim 3, characterized in that: The sampling component further includes a connection layer, which is disposed between the first base portion and the first circuit board, and the first base portion is connected to the first circuit board through the connection layer, and the connection layer avoids the temperature detection component.

7. The battery device according to claim 1, characterized in that: The battery device further includes an insulating adhesive, at least a portion of which is disposed in the accommodating portion and adheres the temperature detecting element to the first circuit board.

8. The battery device according to claim 7, characterized in that: A portion of the insulating adhesive is located in the accommodating portion and covers the outer surface of the temperature detecting element, and another portion of the insulating adhesive is located between the first circuit board and the second circuit board.

9. The battery device according to claim 7, characterized in that: Along the direction from the battery cell to the first circuit board, the insulating glue does not protrude from the surface of the first circuit board away from the battery cell.

10. The battery device according to claim 1, characterized in that: The sampling assembly further includes a reinforcing plate, which is disposed on a side of the second circuit board away from the temperature detecting component, and is connected to the second circuit board.

11. The battery device according to claim 10, characterized in that: In the thickness direction of the first circuit board, the projection of the accommodation portion on the second circuit board is located within the projection of the reinforcing plate on the second circuit board.

12. The battery device according to claim 1, characterized in that: The battery device further includes a busbar connected to the first circuit board and the battery cells.

13. The battery device according to claim 12, characterized in that: In the thickness direction of the first circuit board, a projection of the current collector on the first circuit board does not overlap with a projection of the sampling component on the first circuit board.

14. The battery device according to claim 1, characterized in that: The first circuit board comprises a printed circuit board; and / or, The second circuit board includes a flexible circuit board.

15. An electrical device, characterized in that: The invention comprises a battery device according to any one of claims 1 to 14, wherein the battery device is used to store or provide electrical energy.

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