Battery assembly and electrical device

Abstract

This application provides a battery assembly and an electrical device. The battery assembly includes a battery, a circuit board, and a first connector. The battery has a polarized component. The circuit board includes a first connecting portion disposed on one side of the circuit board along its thickness direction, close to the polarized component. Along the thickness direction of the first connector, the first connector is disposed between the polarized component and the first connecting portion to fix the polarized component and the first connecting portion. The side of the circuit board opposite to the polarized component is insulated. The battery assembly of this application has a high volumetric energy density.

Description

Technical Field

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

[0002] The battery consists of electrodes and a casing. The casing has a cavity to house the electrodes and electrolyte. The electrodes have tabs that connect to terminals, allowing current to be drawn from the electrodes. A protection board assembly is located outside the battery to monitor parameters such as current and voltage, preventing them from exceeding normal ranges. The connection terminals of the protection board assembly need to be electrically connected to the terminals to receive the current from the electrodes. In related technologies, the connection terminals connect to connecting tabs, which in turn connect to the terminals, allowing conductivity between the terminals and the connection terminals. Since the connecting tabs are metal, they are typically covered with insulating covers to prevent short circuits or leakage caused by contact with external objects.

[0003] However, this would increase the size of the battery, thereby reducing its volumetric energy density. Utility Model Content

[0004] Based on this, this application provides a battery assembly and an electrical device.

[0005] In a first aspect, this application provides a battery assembly, the battery assembly comprising:

[0006] The battery has polarized components;

[0007] A circuit board, the circuit board including a first connecting portion, the first connecting portion being disposed on one side of the circuit board in the thickness direction and close to the polar component;

[0008] A first connector is disposed between the polar member and the first connecting portion along the thickness direction of the first polar member, so as to fix the polar member and the first connecting portion in place.

[0009] The side of the circuit board opposite to the polarity element is insulated.

[0010] In one possible implementation, the circuit board includes a first protective layer and a conductive layer stacked together, wherein the first protective layer is located on the side of the conductive layer opposite to the polarity member;

[0011] Along the thickness direction of the circuit board, the orthographic projection of the first protective layer covers the orthographic projection of the conductive layer.

[0012] In one possible implementation, the first connection portion is connected to the side of the conductive layer opposite to the first protective layer, or at least a portion of the conductive layer constitutes the first connection portion.

[0013] In one possible implementation, the circuit board further includes a second protective layer, with the conductive layer located between the first protective layer and the second protective layer;

[0014] The second protective layer has a window, which is correspondingly provided to the first connecting part to expose the connection between the first connecting part and the first connector.

[0015] In one possible implementation, the orthographic projection of the first connection portion lies within the orthographic projection of the window along the thickness direction of the circuit board.

[0016] In one possible implementation, a battery housing is also included, the battery housing comprising a first shell wall having the polarity element disposed thereon.

[0017] The circuit board includes a first flat portion, a first connecting portion is disposed on the side of the first flat portion near the polar member, and the first connecting portion is disposed on the side of the first flat portion near the first shell wall.

[0018] The first straight portion and the first shell wall are set at a first included angle, and the value range of the first included angle is [0°, 15°].

[0019] In one possible implementation, the circuit board further includes an elastic bending portion, one end of which is connected to the first straight portion, and the end of which is fixed away from the first straight portion.

[0020] The elastic bending portion bends away from the first shell wall relative to the first straight portion;

[0021] The elastic bending portion is configured to cause the first straight portion to move away from the polar member when the first connector melts.

[0022] In one possible implementation, the battery assembly further includes at least one of an electrical connector and a protection module, and the circuit board further includes a second flat portion;

[0023] The first end of the second straight portion and the second end of the second straight portion are arranged at a second included angle. The first end of the second straight portion is connected to the end of the elastic bending portion that is away from the first straight portion. At least one of the electrical connector and the protection module is provided at the second end of the second straight portion.

[0024] In one possible implementation, the battery assembly further includes a second connector, at least a portion of which is sandwiched between the first housing wall and the first flat portion, the second connector being fixedly connected to the first housing wall and the first flat portion.

[0025] In one possible implementation, the second connector has a clearance notch through which at least one of the first connecting portion, the first connector, and the polar member passes to securely connect the first connecting portion, the first connector, and the polar member.

[0026] In one possible implementation, the polarity element includes a pole post, and along the thickness direction of the second connector, the orthographic projection of the pole post and the orthographic projection of the first connector are both located within the orthographic projection of the clearance notch.

[0027] In one possible implementation, the battery further includes an insulating element, the polarity of which is opposite to that of the first housing wall, and the insulating element is insulatingly disposed between the polarity of the polarity element and the battery housing;

[0028] Along the thickness direction of the second connector, the orthographic projection of the insulating member lies within the orthographic projection of the clearance notch.

[0029] In one possible implementation, along the thickness direction of the first connector, the orthographic projection of the polar member and the orthographic projection of the first connecting portion both cover the orthographic projection of the first connector.

[0030] In one possible implementation, the melting point of the polar component and the melting point of the first connecting portion are both greater than the melting point of the first connecting component;

[0031] The first connector is configured such that when the temperature is greater than or equal to a preset temperature, the first connector melts to disconnect the polar member and the first connecting portion, and when the temperature is less than the preset temperature, the first connector solidifies to fix the polar member and the first connecting portion together.

[0032] In one possible implementation, the first connecting portion is welded to the polar component via a first connecting member, and the welding method includes one of reflow soldering, electromagnetic induction soldering, and brazing.

[0033] In one possible implementation, the melting point of the first connector is in the range of [80°, 150°].

[0034] In one possible implementation, the first connector is a magnetic connector.

[0035] Secondly, this application also provides an electrical device, including an electrical appliance and a battery assembly as provided in the first aspect above, the battery assembly being used to supply power to the electrical appliance.

[0036] In one possible implementation, the electrical device has a mounting portion, at least a portion of the battery assembly is housed in the mounting portion, and a gap is provided between the battery assembly and the mounting portion to accommodate the molten first connector.

[0037] The battery assembly and electrical device of this application include a battery, a circuit board, and a first connector. The battery includes a polar component, and the circuit board includes a first connecting portion. Because the first connector is provided between the polar component and the first connecting portion, the circuit board and the battery are electrically connected after the polar component and the first connecting portion are fixedly connected by the first connector. Since the side of the circuit board away from the polar component is insulated, and because the first connector is located between the first connecting portion and the polar component in the thickness direction, the first connector will not overflow beyond the edge of the circuit board when connecting the first connecting portion and the polar component, avoiding the phenomenon of the first connector electrically connecting to external circuits. This eliminates the need for an insulating sheet on the side of the circuit board away from the terminal post. Because the insulating sheet is eliminated, the total height of the polar component and the circuit board protruding from the battery housing in the wall thickness direction is smaller, thereby reducing the volume of the battery assembly and increasing the volumetric energy density of the battery assembly. Therefore, the battery assembly provided by this application has a high volumetric energy density.

[0038] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the battery components and electrical devices provided by this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of the battery assembly provided in an embodiment of this application;

[0041] Figure 2 for Figure 1 Exploded view;

[0042] Figure 3 for Figure 2 A magnified view of the area within the dashed circle;

[0043] Figure 4This is a schematic diagram of the structure of the protection component in the battery assembly provided in the embodiments of this application;

[0044] Figure 5 This is another structural schematic diagram of the protection component in the battery assembly provided in the embodiments of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 100 - Battery; 110 - Battery casing; 111 - First casing wall; 120 - Polar component; 130 - Insulating component; 200 - Protection component; 210 - Circuit board; 211 - First connecting part; 212 - First straight part; 213 - Elastic bending part; 214 - Second straight part; 220 - Electrical connector; 230 - Protection module; 300 - First connector; 400 - Second connector; 410 - Clearance notch. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0050] The terms "first," "second," and "third" (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0051] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0052] The battery includes a core and a casing. The casing has a cavity to house the core and electrolyte. The core has tabs that connect to terminals or are welded to the casing. Current from the core is then conducted through the terminals or casing. A protection board assembly is external to the battery to detect parameters such as current and voltage, preventing them from exceeding normal ranges. The connection terminals of the protection board assembly need to be electrically connected to the terminals / casing to obtain the core current. In related technologies, the connection terminals connect to connecting tabs, which in turn connect to terminals, thus establishing electrical conductivity between the terminals and the connection terminals.

[0053] Since the connecting piece is a metal component, it is usually covered with an insulating cover to prevent short circuits or leakage caused by contact between the connecting piece and external objects. However, this increases the size of the battery, thereby reducing its volumetric energy density.

[0054] In view of the above problems, this application provides a battery assembly and an electrical device, wherein a first connector is fixedly connected to a first connecting portion and a polar component to fix the first connecting portion to the polar component, thereby avoiding damage to the side of the circuit board away from the polar component and preventing the first connector from overflowing beyond the edge of the circuit board, thus eliminating the need for additional insulating sheets, thereby reducing the protrusion height of the polar component and the circuit board, and thus improving the volumetric energy density of the battery assembly.

[0055] Reference Figure 1 As shown in the figure, this application provides an electrical device, including an electrical device and a battery assembly, wherein the battery assembly is used to supply power to the electrical device.

[0056] For example, the power-consuming device can be an electronic device such as a mobile phone or a tablet computer. The electronic device such as a mobile phone or a tablet computer can include a central processing unit and a display screen. The power-consuming device has a battery compartment, and a battery 100 can be installed in the battery compartment. The battery assembly is electrically connected to the power-consuming device, thereby enabling the current of the battery assembly to be transmitted to the power-consuming device.

[0057] For example, the electrical equipment can be a vehicle, the electrical device can be an electric motor, and the battery pack can provide electrical energy to the electric motor, which in turn drives the vehicle. The vehicle can be a pure electric vehicle, a range-extended electric vehicle, a hybrid electric vehicle, etc., and can also be any vehicle with a battery pack.

[0058] The battery assembly may include a battery 100 and a protection component 200. The battery 100 is electrically connected to the protection component 200. The protection component 200 may be directly electrically connected to the electrical device. Alternatively, the protection component 200 may be electrically connected to the electrical device through conductive components such as copper busbars, aluminum busbars, wires, FPCs, or PCBs.

[0059] Reference Figures 1 to 3 As shown, based on the above embodiments, this application also provides a battery assembly, which includes a battery 100, a protection component 200, and a first connector 300. The battery 100 includes a battery housing 110 and a polarizing element 120. The polarizing element 120 is disposed on the battery housing 110 and protrudes from the battery housing 110, or a portion of the battery housing 110 constitutes the polarizing element 120. That is, the polarizing element 120 can be a terminal post or the battery housing 110.

[0060] The protection component 200 includes a circuit board 210. The circuit board 210 has a first surface and a second surface disposed opposite to each other along its thickness direction. The first surface of the circuit board 210 is provided with a first connecting portion 211. A first connector 300 is located between the polar member 120 and the circuit board 210, and the polar member 120 and the first connecting portion 211 are mechanically and electrically connected through the first connector 300. The first surface can be referred to as... Figure 4 Surface A in the middle, the second surface can be referenced. Figure 4 Side B of the film.

[0061] It should be noted that the circuit board 210 in this embodiment can be a PCB (Printed Circuit Board), or the circuit board 210 can be an FCB (Flexible Printed Circuit Board), or the circuit board 210 can be composed of both PCB and FCB, that is, one part of the circuit board 210 is a PCB and the other part is an FCB.

[0062] It is understood that the battery 100 may also include an electrode core, which may include a positive electrode sheet, a separator and a negative electrode sheet stacked in sequence. The battery casing 110 is used to house the electrode core and install polarity components 120, etc. The polarity components 120 are used to connect to the electrode core and conduct current out of the electrode core through the polarity components 120.

[0063] For example, Figure 3 In the battery housing 110, the polar component 120 includes a terminal post, which is inserted into the battery housing 110. One end of the terminal post is located inside the battery housing 110 to connect with the electrode core located inside the battery housing 110, and the other end of the terminal post protrudes out of the battery housing 110 to connect with the first connecting portion 211 located outside the battery housing 110.

[0064] In this embodiment, a first connector 300 is provided between the first connecting part 211 and the polar member 120. The first connector 300 can be prefabricated as a sheet and disposed between the polar member 120 and the first connecting part 211. Furthermore, the melting point of the polar member 120 and the melting point of the first connecting part 211 are both greater than the melting point of the first connector 300.

[0065] In this way, when the first connector 300 is placed between the polar member 120 and the first connecting part 211, the welding heat is mainly applied to the first connector 300 to melt the first connector 300, while the polar member 120 and the first connecting part 211 will not melt, thus avoiding damage to the circuit board 210.

[0066] When the melting point of the polar component 120 and the melting point of the first connecting part 211 are both greater than the melting point of the first connecting part 300, the polar component 120 and the first connecting part 211 can be welded by brazing, electromagnetic induction welding or reflow soldering. That is, the polar component 120 and the first connecting part 211 can be directly welded by the first connecting part 300 without the need for welding through an adapter piece.

[0067] For example, the first connector 300 can be a magnetic welded component, that is, the first connector 300 can contain magnetic materials such as iron, cobalt or nickel. When welding the circuit board 210 and the polar component 120, the first connector 300 can be heated by electromagnetic induction heating so that the heat can be directly applied to the first connector 300, and it can be melted by heat and then cooled and solidified to fix the polar component 120 and the first connecting part 211.

[0068] In this way, the first connecting part 211 and the polarity member 120 can be directly connected through the first connecting member 300, and damage to the side of the circuit board 210 away from the polarity member 120 is prevented. This eliminates the need for connecting pieces and insulating pieces in related technologies. Furthermore, the total height of the polarity member 120 and the circuit board 210 protruding from the battery housing 110 in the extending direction of the polarity member 120 is small, thereby reducing the ineffective volume of the battery assembly and improving the volumetric energy density of the battery assembly.

[0069] Compared to other welding methods, such as laser welding or electron beam welding, where the energy of the laser or electron beam acts on the side of the circuit board 210 away from the polarity member 120, potentially damaging this side, electromagnetic induction welding, brazing, or reflow soldering, with the welding heat acting on the first connector 300, avoids damaging the side of the circuit board 210 away from the polarity member 120. Thus, after the circuit board 210 and the polarity member 120 are welded, the first connector 300 is positioned between the first connection portion 211 and the polarity member 120 along its thickness direction. The first connector 300 does not penetrate the side of the circuit board 210 away from the polarity member 120, eliminating the need for an additional insulating sheet on this side. This insulating sheet is used to insulate and isolate the circuit board 210 from other electronic components of the electrical equipment, preventing short circuits.

[0070] Furthermore, the first connector 300 may also contain a low-temperature solder, such that the melting point of the first connector 300 is between 80°C and 150°C. Thus, when either the battery 100 or the protection component 200 reaches a higher temperature, exceeding a preset temperature, the temperature of the first connector 300 located between the polarity member 120 and the circuit board 210 will also exceed the preset temperature. The first connector 300 will melt due to heat, causing the first connection portion 211 and the polarity member 120 to separate, thereby disconnecting the circuit board 210 and the polarity member 120. When the temperatures of both the battery 100 and the protection component 200 are below the preset temperature, the temperature of the first connector 300 will also be below the preset temperature. The first connector 300 located between the polarity member 120 and the circuit board 210 will cool and solidify, thereby fixing the first connection portion 211 and the polarity member 120 together, thus achieving both mechanical and electrical connection between the circuit board 210 and the polarity member 120.

[0071] In other words, the first connector 300 can conduct the circuit between the circuit board 210 and the polarity component 120 when the battery 100 is working normally, and the first connector 300 can cut off the circuit between the circuit board 210 and the polarity component 120 when the battery 100 is working abnormally. The first connector 300 has a dual function.

[0072] When the electrical equipment is provided with a mounting part, at least a portion of the battery assembly can be housed in the mounting part, and a gap is provided between the battery assembly and the battery assembly compartment. This gap can accommodate the molten first connector 300, thereby preventing the first connector 300 from continuing to exist between the first connecting part 211 and the polar member 120.

[0073] It should be noted that after the battery assembly is installed in the mounting part, the battery assembly will not be completely in contact with the inner wall of the mounting part. Therefore, there is a gap between the battery assembly and the mounting part. After the first connector 300 melts, it can flow into this gap under the action of gravity.

[0074] For example, the melting point of the first connector 300 can be any one of 80°C, 85°C, 100°C, 110°C, 120°C, 130°C, and 150°C, or fall within any two of these values. On the one hand, this avoids the first connector 300 having an excessively low melting point. For example, if the first connector 300 is below 80°C, it will disconnect the polarity member 120 from the circuit board 210 during normal use of the battery assembly. On the other hand, this avoids the first connector 300 having an excessively high melting point. For example, if the first connector 300 is above 150°C, it will not be able to effectively provide protection.

[0075] The first connector 300 may also contain flux, which can improve welding efficiency, reduce welding defects, and serve as an insulating medium between the first connector 211 and the polar member 120 after the circuit board 210 and the polar member 120 are separated.

[0076] The number of terminals can be one, in which case one of the terminals and the battery casing 110 is positively charged, and the other of the polarity component 120 and the battery casing 110 is negatively charged. Alternatively, the number of terminals can be two, with the two terminals having opposite polarities.

[0077] It should be noted that the protection component 200 can be used to monitor the voltage, current or temperature of the battery 100, thereby ensuring that the battery 100 operates within a safe operating range and thus improving the performance of the battery component.

[0078] The battery assembly of this embodiment includes a battery 100, a protection component 200, and a first connector 300. The battery 100 includes a battery casing 110 and a polar component 120, and the protection component 200 includes a circuit board 210. Because the first connector 300 is provided between the polar component 120 and the circuit board 210, the polar component 120 and the circuit board 210 can be welded together through the first connector 300. During welding, the first connector 300 located between the polar component 120 and the circuit board 210 is heated, melted, and then cooled and solidified to fix the polar component 120 and the circuit board 210, thereby making the circuit board 210 conductive with the polar component 120. Since the side of the circuit board 210 facing away from the polar component 120 is insulated from external circuitry, and... In the thickness direction of the first connector 300, the first connector 300 is disposed between the first connecting portion 211 and the polarizing member 120. This ensures that when the first connector 300 is used to fix the first connecting portion 211 and the polarizing member 120, the first connector 300 will not overflow beyond the edge of the circuit board 210, and the welding heat will not act on the side of the circuit board 210 facing away from the polarizing member 120. This prevents damage to the side of the circuit board 210 facing away from the polarizing member 120, thus eliminating the need for the insulating sheet on that side. Because the insulating sheet is eliminated, the total height of the polarizing member 120 and the circuit board 210 protruding from the battery housing 110 in the wall thickness direction is smaller, thereby reducing the volume of the battery assembly and increasing its volumetric energy density. Therefore, the battery assembly provided in this embodiment has a high volumetric energy density.

[0079] Reference Figure 3 and Figure 4 As shown, in one possible implementation, the first connecting part 211 can be a solder pad, which is fixedly connected to the first connecting member 300.

[0080] Thus, during welding, after the first connector 300 is heated, melted, cooled, and solidified, it can fix the connection between the solder pad and the polar component 120, thereby fixing the connection between the circuit board 210 and the polar component 120, so that the circuit board 210 and the polar component 120 are connected.

[0081] In one possible implementation, the circuit board 210 further includes a first protective layer and a second protective layer, which are stacked on top of each other. The second protective layer is located on the side of the first protective layer closer to the polarity member 120. The second protective layer has a window that corresponds to the pad, so that the pad is exposed.

[0082] It is understood that the circuit board 210 may also include a conductive layer connected to the first connection portion 211, or at least a portion of the conductive layer forms the first connection portion 211, thereby enabling the conductive layer to conduct electricity with the polarity member 120 to transmit current from the battery 100. The conductive layer may be disposed between the first protective layer and the second protective layer, thereby protecting the conductive layer. The second protective layer has a window to expose the first connection portion 211 outside the second protective layer, facilitating connection between the first connection portion 211 and the first connector 300. The first protective layer remains intact to insulate the first connection portion 211, preventing short circuits when the battery assembly is installed in electrical equipment. Thus, the side of the circuit board 210 facing away from the polarity member 120 does not require additional insulating material.

[0083] The first protective layer may include a polyimide (PI) film and an adhesive layer. The main functions of the first and second protective layers are to protect the circuit of the conductive layer from the influence of external environment such as moisture and dust, and to provide certain mechanical protection for the conductive layer. The adhesive layer can be used to firmly adhere the polyimide film to the surface of the conductive layer.

[0084] It is understood that, in the thickness direction of the circuit board 210, the orthographic projection of the first protective layer completely covers the orthographic projection of the conductive layer, so that the side of the circuit board 210 facing away from the polarity member 120 is insulated from the external circuit, and the additional insulating sheet can be eliminated.

[0085] In some embodiments, along the thickness direction of the circuit board 210, the orthographic projection of the first connection portion 211 is located within the orthographic projection of the window, or the orthographic projection of the first connection portion 211 coincides with the orthographic projection of the window, which facilitates the first connection portion 211 being exposed through the window, thereby facilitating the first connection portion 211 being fixedly connected to the polar member 120 through the first connector 300.

[0086] Reference Figure 3 and Figure 4 As shown, in some embodiments, the battery housing 110 includes a first housing wall 111, the circuit board 210 includes a first flat portion 212, the polarity member 120 is disposed on the first housing wall 111, and the first connecting portion 211 is disposed on the first flat portion 212.

[0087] Thus, the first straight portion 212 can be fixedly connected to the first connector 300 via the first connecting portion 211, thereby fixing the circuit board 210 to the polar component 120, and making the circuit board 210 and the polar component 120 conductive. The first connecting portion 211 is located on the side of the first straight portion 212 facing the polar component 120.

[0088] Reference Figures 3 to 5As shown, in some embodiments, the circuit board 210 further includes an elastic bending portion 213, one end of which is connected to the first straight portion 212, and the other end of which is fixedly disposed. The first straight portion 212 is disposed parallel to the first shell wall 111, and the elastic bending portion 213 bends away from the first shell wall 111 relative to the first straight portion 212.

[0089] It should be noted that when the first straight portion 212 is arranged parallel to the first shell wall 111, the first straight portion 212 is also arranged parallel to the end face of the polar component 120 facing the circuit board 210, so as to facilitate the welding of the first straight portion 212 and the polar component 120.

[0090] The parallel arrangement described in the above embodiments can be understood as the first straight portion 212 and the first shell wall 111 being arranged at a first included angle of 0° to 15°.

[0091] When the battery 100 reaches a high temperature due to charging and discharging, the heat from the battery 100 will cause the first connector 300 between the polar component 120 and the circuit board 210 to melt due to the low melting point of the first connector 300. This will cause the polar component 120 and the circuit board 210 to separate. The elastic bending portion 213 bends relative to the first straight portion 212, thereby storing elastic potential energy. This elastic potential energy can be converted into kinetic energy after the polar component 120 and the circuit board 210 separate, thereby driving the first straight portion 212 to move away from the polar component 120. This will make the separation of the first straight portion 212 and the polar component 120 more complete, thus completely cutting off the circuit between the circuit board 210 and the polar component 120.

[0092] Reference Figures 2 to 5 As shown, in some embodiments, the protection component 200 further includes an electrical connector 220 and a protection module 230. The circuit board 210 also includes a second straight portion 214. The first straight portion 212, the elastic bending portion 213, and the second straight portion 214 are connected in sequence. When the battery assembly is installed in the electrical device, the second straight portion 214 is fixedly connected to the electrical device, so that the end of the elastic bending portion 213 away from the first straight portion 212 is fixedly set, which facilitates the elastic bending portion 213 to drive the first straight portion 212 to move away from the polarity member 120. The electrical connector 220 and the protection module 230 are connected to opposite sides of the second straight portion 214. For example, the electrical connector 220 is provided on the first surface, and the protection module 230 is provided on the second surface.

[0093] The electrical connector 220 can be a connector, and the protection module 230 includes a protection switch, etc. The protection switch detects the voltage and current of the battery 100 to determine whether it is within the protection threshold. If it exceeds the protection threshold, it outputs a low level to disconnect the protection switch, cut off the circuit, and thus stop the battery 100 from charging and discharging, thereby protecting the battery 100. The connector is used to connect to circuits outside the battery assembly. For example, the connector can connect the battery 100 to an external power source to transmit electrical energy.

[0094] In some embodiments, the first end of the second straight portion 214 and the second end of the second straight portion 214 may be set at a second included angle. For example, the extension direction of the first end of the second straight portion 214 may be consistent with the extension direction of the first straight portion 212 and the elastic bending portion 213, and the second end of the second straight portion 214 may be set perpendicular to the first end of the second straight portion 214. In this way, it can prevent the circuit board 210 from extending entirely in one direction, which would cause the size of the circuit board 210 in that direction to be too large. In this embodiment, the first end of the second straight portion 214 and the second end of the second straight portion 214 may be set at a second included angle, which is beneficial to reduce the size of the circuit board 210 in the extension direction of the first straight portion 212, and thus facilitates the installation of the circuit board 210 to the mounting portion of the electrical device.

[0095] Reference Figure 2 and Figure 3 As shown, in some embodiments, the battery assembly further includes a second connector 400, the two opposite sides of which are connected to the first straight portion 212 and the first shell wall 111, respectively.

[0096] For example, the second connector 400 can be double-sided adhesive. Before soldering the circuit board 210 and the polarizing component 120, the circuit board 210 and the battery casing 110 can be pre-connected through the second connector 400, thereby pre-fixing the soldering of the circuit board 210 and the polarizing component 120 and improving the soldering reliability of the circuit board 210 and the polarizing component 120. Furthermore, after the circuit board 210 and the polarizing component 120 are soldered, the second connector 400 can reliably connect the battery casing 110 and the circuit board 210, thereby improving the connection reliability of the circuit board 210 and the polarizing component 120.

[0097] For example, the second connector 400 can be a hot melt adhesive, and the melting point of the second connector 400 can be close to or the same as the melting point of the first connector 300. In this way, when the first connector 300 is heated, the heat of the first connector 300 is conducted to the second connector 400, which can also melt the second connector 400. After the second connector 400 cools and solidifies, it can reliably bond the battery casing 110 and the circuit board 210. When the battery 100 is at a high temperature, the heat of the battery 100 can also melt the second connector 400, so that the circuit board 210 and the battery casing 110 can be separated, thereby facilitating the separation of the circuit board 210 and the polar component 120.

[0098] Reference Figure 3 As shown, in one possible implementation, the second connector 400 has a clearance notch 410 through which one of the first connector 300 and the polar member 120 passes to connect with the other.

[0099] In this way, the clearance notch 410 can avoid the portion of the first connector 300 and the polar member 120 protruding from the first shell wall 111, thereby allowing one side of the second connector 400 to be bonded to the battery shell 110 and the other side of the second connector 400 to be bonded to the circuit board 210. The thickness of the second connector 400 can be equal to the height of the polar member 120 protruding from the first shell wall 111 plus the thickness of the first connector 300.

[0100] In some embodiments, along the thickness direction of the second connector 400, the orthographic projection of the electrode post on the battery housing 110 and the orthographic projection of the first connector 300 on the battery housing 110 are both located within the orthographic projection of the clearance notch 410 on the battery housing 110.

[0101] In this way, the clearance notch 410 avoids the terminal post and the first connector 300, and the thickness of both the terminal post protruding from the battery housing 110 and the first connector 300 can at least partially overlap with the thickness of the second connector 400, so as to avoid the total thickness increasing due to the sequential stacking of the three.

[0102] In some embodiments, along the thickness direction of the first connector 300, the orthographic projection of the first connecting portion 211 covers the orthographic projection of the first connector 300, and the orthographic projection of the polarizing member 120 covers the orthographic projection of the first connector 300. This allows the first connector 300 to reliably connect the polarizing member 120 and the first connecting portion 211, and confines the first connector 300 between the polarizing member 120 and the first connecting portion 211. This prevents the first connector 300 from being exposed to the polarizing member 120 or the protective assembly 200, thus preventing the first connector 300 from contacting other electrical devices and causing a short circuit in the battery 100.

[0103] In one possible implementation, the battery 100 further includes an electrode core, a first electrode tab, and a second electrode tab, the first and second electrode tabs having opposite polarities. The battery casing 110 has a receiving cavity in which the electrode core, the first electrode tab, and the second electrode tab are all housed. The first electrode tab is connected to the polarity member 120, and the second electrode tab is connected to the battery casing 110.

[0104] For example, the first tab can lead out the positive electrode of the core, and the other of the second tabs can lead out the negative electrode of the core. After the first tab and the polarity member 120 are connected, the positive current of the core can be transmitted sequentially from the first tab and the polarity member 120 to the circuit outside the battery 100, and the negative current of the core can be transmitted sequentially from the second tab and the battery casing 110 to the circuit outside the battery 100, thereby enabling the protection component 200 or the electrical device to obtain the current of the battery 100.

[0105] Reference Figure 4 As shown, in some embodiments, the battery 100 further includes an insulating member 130, the first housing wall 111 has a terminal hole, the terminal is disposed in the terminal hole, and the insulating member 130 is disposed between the terminal and the terminal hole to insulate and isolate the terminal and the battery housing 110.

[0106] Along the thickness direction of the second connector 400, the orthographic projection of the insulating member 130 onto the battery housing 110 is located within the orthographic projection of the clearance notch 410 onto the battery housing 110.

[0107] Thus, when the battery casing 110 is energized, part of the insulating member 130 can be located between the terminal post and the terminal post hole, and part of the insulating member 130 can be located between the polar member 120 and the first casing wall 111, thereby making the polar member 120 insulated from the first casing wall 111, thereby preventing the battery 100 from short-circuiting.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery assembly, characterized in that, include: The battery (100) is provided with a polarity element (120). The circuit board (210) includes a first connecting portion (211), which is disposed on one side of the circuit board (210) in the thickness direction and close to the polar member (120). A first connector (300) is disposed between the polar member (120) and the first connecting portion (211) along the thickness direction of the first connector (300) to fix the polar member (120) and the first connecting portion (211). The circuit board (210) is insulated on the side opposite to the polarity member (120).

2. The battery assembly according to claim 1, characterized in that, The circuit board (210) includes a first protective layer and a conductive layer stacked together, wherein the first protective layer is located on the side of the conductive layer opposite to the polar member (120); In the thickness direction of the circuit board (210), the orthographic projection of the first protective layer covers the orthographic projection of the conductive layer.

3. The battery assembly according to claim 2, characterized in that, The first connection portion (211) is connected to the side of the conductive layer away from the first protective layer, or at least part of the conductive layer constitutes the first connection portion (211).

4. The battery assembly according to claim 3, characterized in that, The circuit board (210) further includes a second protective layer, which is located on the side of the conductive layer near the polar member (120); The second protective layer is provided with a window, which is provided in correspondence with the first connecting part (211) to expose the first connecting part (211).

5. The battery assembly according to claim 4, characterized in that, Along the thickness direction of the circuit board (210), the orthographic projection of the first connecting portion (211) is within the orthographic projection of the window.

6. The battery assembly according to claim 1, characterized in that, It also includes a battery housing (110), which includes a first housing wall (111) and the first housing wall (111) is provided with the polarity member (120). The circuit board (210) includes a first flat portion (212), a first connecting portion (211) is provided on the side of the first flat portion (212) near the polar member (120), and the first connecting portion (211) is provided on the side of the first flat portion (212) near the first shell wall (111); The first straight portion (212) and the first shell wall (111) are arranged at a first included angle, and the value range of the first included angle is [0°, 15°].

7. The battery assembly according to claim 6, characterized in that, The circuit board (210) also includes an elastic bending portion (213), one end of which is connected to the first straight portion (212), and the end of the elastic bending portion (213) facing away from the first straight portion (212) is fixedly disposed. The elastic bending portion (213) bends away from the first shell wall (111) relative to the first straight portion (212); The elastic bending portion (213) is configured to cause the first straight portion (212) to move away from the polar member (120) when the first connector (300) melts.

8. The battery assembly according to claim 7, characterized in that, It also includes at least one of an electrical connector (220) and a protection module (230), and the circuit board (210) also includes a second flat portion (214). The first end of the second straight portion (214) is set at a second included angle with the second end of the second straight portion (214). The first end of the second straight portion (214) is connected to the end of the elastic bending portion (213) away from the first straight portion (212). At least one of the electrical connector (220) and the protection module (230) is provided at the second end of the second straight portion (214).

9. The battery assembly according to claim 6, characterized in that, It also includes a second connector (400), at least a portion of which is sandwiched between the first shell wall (111) and the first straight portion (212), and the second connector (400) is fixedly connected to the first shell wall (111) and the first straight portion (212).

10. The battery assembly according to claim 9, characterized in that, The second connector (400) has a clearance notch (410), and at least one of the first connecting portion (211), the first connector (300) and the polar member (120) is adapted to pass through the clearance notch (410) so that the polar member (120), the first connector (300) and the first connecting portion (211) are fixedly connected.

11. The battery assembly according to claim 10, characterized in that, The polar component (120) includes a pole post, and along the thickness direction of the second connector (400), the orthographic projection of the pole post and the orthographic projection of the first connector (300) are both located within the orthographic projection of the clearance notch (410).

12. The battery assembly according to claim 10, characterized in that, It also includes an insulating element (130), wherein the polarity of the polarity of the polarity of the polarity of the polarity of the polarity of the polarity of the first shell wall (111) is opposite, and the insulating element (130) is insulatingly disposed between the polarity of ... Along the thickness direction of the second connector (400), the orthographic projection of the insulating member (130) lies within the orthographic projection of the clearance notch (410).

13. The battery assembly according to any one of claims 1-12, characterized in that, Along the thickness direction of the first connector (300), the orthographic projection of the polar member (120) and the orthographic projection of the first connecting portion (211) both cover the orthographic projection of the first connector (300).

14. The battery assembly according to any one of claims 1-12, characterized in that, The melting point of the polar component (120) and the melting point of the first connecting part (211) are both greater than the melting point of the first connecting component (300); The first connector (300) is configured such that when the temperature is greater than or equal to a preset temperature, the first connector (300) melts to disconnect the electrical connection between the polar member (120) and the first connecting part (211), and when the temperature is less than the preset temperature, the first connector (300) solidifies to fix the connection between the polar member (120) and the first connecting part (211).

15. The battery assembly according to claim 14, characterized in that, The first connecting part (211) is welded to the polar part (120) through the first connecting member (300), and the welding method includes one of reflow soldering, electromagnetic induction soldering and brazing.

16. The battery assembly according to claim 14, characterized in that, The melting point of the first connector (300) is in the range of [80℃, 150℃].

17. The battery assembly according to claim 14, characterized in that, The first connector (300) is a magnetic connector.

18. An electrical appliance, characterized in that, It includes an electrical device and a battery assembly as described in any one of claims 1-17, wherein the circuit board and the electrical device are electrically connected.

19. The electrical equipment according to claim 18, characterized in that, The electrical equipment is provided with a mounting part, at least a portion of the battery assembly is housed in the mounting part, and a gap is provided between the battery assembly and the mounting part, the gap being adapted to accommodate the first connector after melting.

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