Battery assembly, battery cell assembly, and electric device

Abstract

The application belongs to the technical field of batteries, and provides a battery assembly, a battery cell assembly and a power utilization device. The battery assembly comprises a first circuit board and a battery cell assembly, the first circuit board is provided with a first terminal; the battery cell assembly comprises a second circuit board and a battery cell, the second circuit board is electrically connected with the battery cell; the second circuit board is provided with a second terminal, and the second terminal forms a nondestructive separable electrical connection with the first terminal. In the battery assembly provided by the application, when one of the battery cells is abnormal, only the abnormal battery cell needs to be replaced, and the maintenance cost of the battery assembly is relatively low.

Description

Technical Field

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

[0002] Battery modules are used to power electrical equipment.

[0003] A battery assembly consists of a sampling circuit board and multiple battery cells. The number of cells and their electrical connections can vary depending on the voltage and current requirements of the electrical device. The sampling circuit board has multiple pads, and the tabs of the battery cells are soldered to different pads on the sampling circuit board, ensuring that all cells are electrically connected to it. The sampling circuit board is used to acquire information such as voltage, current, and temperature from the multiple cells. When one cell in the battery assembly malfunctions, removing the faulty cell individually can easily damage the pads on the sampling circuit board or the cell's tabs. Therefore, if one cell malfunctions, the entire battery assembly needs to be replaced.

[0004] Among related technologies, the maintenance process for battery components is costly. Utility Model Content

[0005] This application provides a battery assembly, a cell assembly, and an electrical device. When one of the cells in the battery assembly malfunctions, only the malfunctioning cell needs to be replaced, resulting in low maintenance costs for the battery assembly.

[0006] This application provides a battery assembly, including a first circuit board and a battery cell assembly. The first circuit board has a first terminal. The battery cell assembly includes a second circuit board and a battery cell. The second circuit board is electrically connected to the battery cell. The second circuit board has a second terminal, and the second terminal forms a non-destructive electrical connection with the first terminal.

[0007] In one possible implementation, the battery assembly provided in this application includes a second circuit board for collecting operating status information of the battery cell electrically connected to it, and a first circuit board for acquiring the operating status information collected by the second circuit board.

[0008] In one possible implementation, the battery assembly provided in this application includes multiple battery cell assemblies, each of which includes a second circuit board and a battery cell electrically connected to the second circuit board; the second circuit boards in the multiple battery cell assemblies are connected in series, parallel, or mixed through the first circuit board.

[0009] In one possible implementation, the battery assembly provided in this application has a plurality of first terminals on the first circuit board; there are multiple battery cell assemblies, each of which includes a second circuit board and a battery cell electrically connected to the second circuit board; the second terminal in each second circuit board forms a non-destructively separable electrical connection with different first terminals; the first circuit board is used to acquire working status information collected by multiple second circuit boards.

[0010] In one possible implementation, the battery assembly provided in this application includes at least a portion of the second circuit board comprising a second board body and a plurality of functional devices, wherein the plurality of functional devices and the second terminal are disposed on the second board body, and the second terminal and the plurality of functional devices are electrically connected to the second board body.

[0011] In one possible implementation, the battery assembly provided in this application includes at least one of a power transistor, a fuse, a fuel gauge, and a temperature sensor.

[0012] In one possible implementation, the battery assembly provided in this application further includes a support base, the support base including a first frame and a second frame arranged at intervals along a first direction, the first circuit board being disposed near the first frame, and the battery cell assembly being disposed near the second frame; the battery cell assembly has a first surface and a second surface opposite to each other along the first direction, the first surface facing the first frame and the second surface facing the second frame; the second circuit board is located on the side of the first surface away from the second surface; the first terminal faces the second circuit board and forms a non-destructively separable electrical connection with the second terminal on the second circuit board.

[0013] In one possible implementation, the battery assembly provided in this application includes a plurality of battery cell assemblies, which are arranged along a second direction. The first circuit board has a plurality of first terminals. The plurality of first terminals face the second circuit board and form a non-destructive electrical connection with the second terminals on different second circuit boards.

[0014] In one possible implementation, the battery assembly provided in this application has the first circuit board abutting against the first frame on the side opposite to the second circuit board, and the second side of the cell assembly abutting against the second frame.

[0015] In one possible implementation, the battery assembly provided in this application has at least one of the first terminal and the second terminal being resilient, with the first terminal abutting against the second terminal.

[0016] In one possible implementation, the battery assembly provided in this application further includes a plurality of adapters, one end of which abuts against the first terminal and the other end of which abuts against the second terminal.

[0017] In one possible implementation, the battery assembly provided in this application has a snap-fit ​​protrusion on the second frame that protrudes toward the second side of the cell assembly, and the second side of the cell assembly has a slot, in which the snap-fit ​​protrusion is inserted.

[0018] In one possible implementation, the battery assembly provided in this application has a first clearance opening on the second frame, and along the first direction, at least a portion of the orthographic projection of the second surface of the battery cell assembly and the orthographic projection of the first clearance opening at least partially overlap.

[0019] In one possible implementation, the battery assembly provided in this application further includes a partition plate in the support base, the first frame, the partition plate and the second frame are arranged sequentially at intervals along the first direction, the first circuit board abuts between the partition plate and the first frame, and the cell assembly abuts between the partition plate and the second frame.

[0020] In one possible implementation, the battery assembly provided in this application has a second clearance opening on the separator plate; the first terminal passes through the second clearance opening to be electrically connected to the second terminal;

[0021] Alternatively, the second terminal may be inserted into the second clearance opening to be electrically connected to the first terminal;

[0022] Alternatively, the battery assembly may further include an adapter that passes through the second clearance opening.

[0023] In one possible implementation, the battery assembly provided in this application has multiple first terminals, multiple second terminals, and multiple second clearance openings; the multiple second clearance openings are arranged at intervals along a second direction, and the multiple first terminals are respectively disposed in different second clearance openings to be electrically connected to different second terminals.

[0024] Alternatively, multiple second terminals may be respectively inserted into different second clearance openings to be electrically connected to different first terminals;

[0025] Alternatively, there may be multiple adapters, each of which is inserted into a different second clearance opening.

[0026] In one possible implementation, the battery assembly provided in this application has a groove extending in a second direction on the separator plate.

[0027] In one possible implementation, the battery assembly provided in this application further includes a protective shell, in which the second circuit board and the battery cell are both located. The protective shell has a third clearance opening on one side opposite to the first surface in the first direction. The third clearance opening is correspondingly disposed to the second terminal, and the first terminal passes through the third clearance opening to abut against the second terminal.

[0028] In one possible implementation, the battery assembly provided in this application includes a battery cell with a tab, a second circuit board with a third terminal, the third terminal and the second terminal being respectively disposed on opposite sides of the second circuit board along the thickness direction of the second circuit board, the third terminal being disposed on the side of the second circuit board close to the battery cell, the third terminal being electrically connected to the tab, and the second terminal and the third terminal being electrically connected.

[0029] In one possible implementation, the battery assembly provided in this application, wherein the protective shell, the second circuit board, and the battery cell are integrally formed by injection molding.

[0030] In one possible implementation, the battery assembly provided in this application has a third side and a fourth side disposed opposite to each other along a third direction, and the protective shell has a first hollow portion on one side of the third side and one side of the fourth side.

[0031] In one possible implementation, the battery assembly provided in this application has the cell's feature information printed on the area aligned with the first cutout portion.

[0032] In one possible implementation, the battery assembly provided in this application includes a base plate, with the first frame and the second frame both connected to the base plate. The base plate has a plurality of second cutouts, which are aligned with the first cutouts along a third direction. A reinforcing member is provided between two adjacent second cutouts.

[0033] This application also provides a battery cell assembly, including a battery cell, a second circuit board and a protective shell, wherein the second circuit board and the battery cell are fixed together by welding tabs; the second circuit board and the battery cell are integrally molded in the protective shell by injection molding; the protective shell has a third clearance opening on its first side, and the second terminal of the second circuit board is exposed through the third clearance opening.

[0034] This application also provides an electrical device, including a device body and the aforementioned battery assembly or battery cell assembly, wherein the battery assembly or battery cell assembly is connected to the device body.

[0035] The battery assembly provided in this application comprises a first circuit board and a battery cell assembly. The first circuit board has a first terminal. The battery cell assembly includes a second circuit board and a battery cell, with the second circuit board electrically connected to the battery cell. The second circuit board has a second terminal, which forms a non-destructive electrical connection with the first terminal. Therefore, replacing the battery cell assembly will not damage the second terminal or the first terminal. This allows for the replacement of only the faulty battery cell assembly, resulting in lower maintenance costs for the battery assembly. Attached Figure Description

[0036] 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.

[0037] Figure 1 This is a schematic diagram of the structure of a battery assembly in the relevant technology;

[0038] Figure 2 This is a schematic diagram of the structure of the battery assembly provided in an embodiment of this application;

[0039] Figure 3 An exploded view of the battery assembly provided in an embodiment of this application;

[0040] Figure 4 This is a schematic diagram of the structure of the cell assembly in the battery module provided in the embodiments of this application;

[0041] Figure 5 for Figure 4 An explosion diagram;

[0042] Figure 6 for Figure 5 Another view;

[0043] Figure 7 This is a schematic diagram of the structure of the support base in the battery assembly provided in the embodiments of this application;

[0044] Figure 8 This is another structural schematic diagram of the support base in the battery assembly provided in the embodiments of this application;

[0045] Figure 9 This is a partial structural diagram of the first circuit board in the battery assembly provided in an embodiment of this application;

[0046] Figure 10 This is a schematic diagram of the structure of the second circuit board in the battery assembly provided in the embodiments of this application;

[0047] Figure 11This is a schematic diagram showing the connection between the first terminal and the second terminal in the battery assembly provided in an embodiment of this application.

[0048] Explanation of reference numerals in the attached figures:

[0049] 10-Battery assembly; 11-Frame; 12-Sampling circuit board; 12a-Pad; 13-Battery cell; 13a-Taper; 14-Cable; 15-Cover plate; 16-Insulating sheet; 17-Silicone film;

[0050] 100 - Battery assembly;

[0051] 110 - First circuit board; 111 - First terminal; 1111 - Elastic probe; 1112 - Base; 112 - First board body;

[0052] 120 - Cell assembly; 120a - First side; 120b - Second side; 120c - Third side; 120d - Fourth side;

[0053] 121-Second circuit board; 1211-Second terminal; 1211a-Metal contact; 1212-Second board body; 1213-Functional device; 1214-Third terminal; 1214a-Positive terminal; 1214b-Negative terminal;

[0054] 122 - Battery cell; 1221 - Tab; 1221a - Positive tab; 1221b - Negative tab; 1222 - Battery cell body;

[0055] 123 - Card slot;

[0056] 124-Protective shell; 1241-Third clearance opening; 1242-First perforated section;

[0057] 130 - Support base; 130a - Mounting part; 130b - Fastener;

[0058] 131-First frame; 132-Second frame; 1321-Snap-fit ​​protrusion; 1322-First clearance opening; 133-Third frame; 134-Fourth frame; 135-Divider plate; 135a-First divider plate; 135b-Second divider plate; 1351-Second clearance opening; 1352-Groove; 136-Base plate; 1361-Second hollow section; 1362-Reinforcing member;

[0059] 140-cable;

[0060] 150-cover plate;

[0061] 160-Adapter;

[0062] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0064] 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 of 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.

[0065] 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 orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0066] 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, for example, in orders other than those illustrated or described herein.

[0067] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or maintenance tool that includes a series of steps or units, 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 maintenance tool.

[0068] Battery modules are used to power electrical equipment.

[0069] Figure 1 This is a schematic diagram of the structure of a battery assembly in a related technology.

[0070] See Figure 1As shown, the battery assembly 10 includes a frame 11, a sampling circuit board 12, and multiple battery cells 13. The frame 11 supports the sampling circuit board 12 and the battery cells 13. The number of battery cells 13 and the manner of their electrical connection may vary depending on the voltage and current required by the electrical device.

[0071] The sampling circuit board 12 has multiple pads 12a, and the tabs 13a of the battery cells 13 are soldered to different pads 12a on the sampling circuit board 12. For example, the tabs 13a can be soldered to the pads 12a by laser spot welding. Thus, multiple battery cells 13 are electrically connected to the sampling circuit board 12. The battery assembly 10 also includes a cable 14, one end of which is electrically connected to the sampling circuit board 12, and the other end can be electrically connected to external monitoring equipment. The sampling circuit board 12 is used to acquire information such as voltage, current, and temperature of the multiple battery cells. The information acquired by the sampling circuit board 12 from the multiple battery cells 13 is transmitted to the monitoring equipment via the cable 14.

[0072] The battery assembly 10 also includes a cover plate 15, which covers the sampling circuit board 12 to protect it. The battery assembly 10 also includes an insulating sheet 16, which can be attached to one surface of the battery cell 13. The battery assembly 10 includes a screen printing film 17, which can be attached to one surface of the battery cell 13, and the specifications of the battery assembly 10 can be printed on the screen printing film 17.

[0073] When one of the cells 13 in the battery pack 10 malfunctions, since the cell 13 is soldered to the pad 12a of the sampling circuit board 12, removing the malfunctioning cell 13 alone can easily damage the pad 12a on the sampling circuit board 12 or the tab 13a of the cell 13. Therefore, when one of the cells 13 malfunctions, it is necessary to replace the sampling circuit board 12 and all the cells 13 in the battery pack 10.

[0074] In related technologies, the maintenance process of battery module 10 is costly.

[0075] Based on this, embodiments of this application provide a battery assembly, a cell assembly, and an electrical device. When one of the cells in the battery assembly malfunctions, only the malfunctioning cell needs to be replaced, resulting in low maintenance costs for the battery assembly.

[0076] The electrical equipment can be vehicles, aircraft, ferries, computers, or energy storage cabinets, etc., powered by battery packs. Vehicles can be electric vehicles (EVs), pure electric vehicles (PEVs / BEVs), hybrid electric vehicles (HEVs), range-extended electric vehicles (REEVs), plug-in hybrid electric vehicles (PHEVs), or new energy vehicles. Electrical equipment can also be laptops, tablets, etc. This application uses a laptop as an example for illustration.

[0077] Figure 2 This is a schematic diagram of the structure of the battery assembly provided in an embodiment of this application.

[0078] See Figure 2 As shown, the electrical equipment includes a device body and a battery assembly 100, with the battery assembly 100 connected to the device body.

[0079] The device body can be the chassis of a laptop computer, and the battery assembly 100 can be fixed to the chassis using fasteners. For example, multiple mounting portions 130a can be spaced apart around the battery assembly 100, each mounting portion 130a having mounting holes (not shown in the figure). Fasteners 130b can be inserted into the mounting holes to connect the battery assembly 100 to the laptop computer chassis. The battery assembly 100 is used to power components such as the motherboard and display screen in the laptop computer.

[0080] The structure of the battery assembly 100 provided in the embodiments of this application will be described below.

[0081] Figure 3 An exploded view of the battery assembly provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the cell assembly in the battery module provided in the embodiments of this application; Figure 5 for Figure 4 An explosion diagram.

[0082] See Figures 2 to 5As shown, the battery assembly 100 provided in this application embodiment includes a first circuit board 110 and a cell assembly 120. The first circuit board 110 has a first terminal 111. The cell assembly 120 includes a second circuit board 121 and a cell 122. The second circuit board 121 is electrically connected to the cell 122 to obtain the working status information of the cell 122. The second circuit board 121 has a second terminal 1211. The second terminal 1211 in the second circuit board 121 forms an electrical connection with the first terminal 111 that can be separated without damage.

[0083] The battery cell assembly 120 can be one or more. The number of first terminals 111 on the first circuit board 110 is the same as the number of battery cell assemblies 120. When there are multiple battery cell assemblies 120, the first circuit board 110 has multiple first terminals 111, and each battery cell assembly 120 includes a second circuit board 121 and a battery cell 122 electrically connected to the second circuit board 121. The second terminals 1211 in each second circuit board 121 form non-destructively separable electrical connections with different first terminals 111. The first circuit board 110 is used to acquire the operating status information collected by the multiple second circuit boards 121. Figure 2 and Figure 3 The diagram schematically shows four cell assemblies 120 and four first terminals 111.

[0084] Figure 6 for Figure 5 Another viewpoint.

[0085] See Figure 5 and Figure 6 As shown, the second circuit board 121 can be a sampling circuit board. The second circuit board 121 includes a second board body 1212 and multiple functional devices 1213. The multiple functional devices 1213 and the second terminal 1211 are both disposed on the second board body 1212. The second terminal 1211 and the multiple functional devices 1213 are all electrically connected to the second board body 1212.

[0086] Please continue reading Figure 5 and Figure 6 As shown, the battery cell 122 includes a tab 1221, and the second circuit board 121 has a third terminal 1214. The third terminal 1214 and the second terminal 1211 are respectively disposed on opposite sides of the second circuit board 121. The third terminal 1214 faces the battery cell 122 and is electrically connected to the tab 1221. The second terminal 1211 and the third terminal 1214 are electrically connected.

[0087] The battery cell 122 includes a cell body 1222 and tabs 1221. The tabs 1221 lead out the positive and negative terminals of the cell body 1222. The tabs 1221 may include a positive tab 1221a and a negative tab 1221b. The third terminal 1214 includes a positive terminal 1214a and a negative terminal 1214b. The positive tabs 1221a and 1221b are bent relative to the cell body 1222. The side of the second circuit board 121 with the third terminal 1214 faces the tabs 1221 of the battery cell 122. The positive tab 1221a is soldered to the positive terminal 1214a, so that the positive tab 1221a and the positive terminal 1214a are electrically connected. The negative tab 1221b is soldered to the negative terminal 1214b, so that the negative tab 1221b and the negative terminal 1214b are electrically connected. The third terminal 1214 is electrically connected to the second board 1212, thereby enabling the battery cell 122 to be electrically connected to the second circuit board 121. The second terminal 1211 is also electrically connected to the second board 1212, thereby enabling the third terminal 1214 to be electrically connected to the second terminal 1211.

[0088] Please continue reading Figure 6 As shown, the second circuit board 121 also includes a plurality of functional devices 1213, which may include at least one of a power transistor, a fuse, a power meter and a temperature sensor.

[0089] The power transistor can be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), which controls the on / off state of the charging and discharging circuit. When the current exceeds a threshold, the fuse blows, cutting off the charging and discharging circuit and preventing fire or battery damage. A temperature sensor monitors the battery temperature in real time to prevent overheating. A fuel gauge monitors the battery voltage or charging / discharging current. During normal charging and discharging, the fuel gauge monitors the voltage or current, the MOSFET remains on, and the temperature sensor confirms no overheating. When the current exceeds a threshold, the MOSFET fails to turn off or the fuse blows. When the temperature of cell 122 is too high, the temperature sensor triggers protection, and the MOSFET shuts off the charging circuit. In other words, the power transistor, fuse, fuel gauge, and temperature sensor work together to acquire the operating status information of cell 122 during charging and discharging, monitoring the charging and discharging process of cell 122. Therefore, the second circuit board 121 can monitor the operating status information of cell 122 during charging and discharging.

[0090] The first circuit board 110 includes a first board body 112, on which a plurality of first terminals 111 are provided. The second board body 1212 is provided on the side opposite to the battery cell 122, and a plurality of second terminals 1211 are provided. The second terminals 1211 on different second boards 1212 are electrically connected to different first terminals 111 on the first board body 112 respectively.

[0091] The second circuit board 121 is used to collect the working status information of the battery cell 122 that is electrically connected to it, and the first circuit board 110 is used to acquire the working status information collected by the second circuit board 121.

[0092] The battery assembly 100 also includes a cable 140 that electrically connects the first circuit board 110 to an external monitoring device. Thus, the operating status information of the multiple battery cells 122 is acquired via the second circuit board 121, aggregated via the second circuit board 121, and transmitted to the external monitoring device via the first circuit board 110.

[0093] The statement that the second terminal 1211 and the first terminal 111 form a non-destructive electrical connection means that when one or more battery cell assemblies 120 are replaced, neither the second terminal 1211 nor the first terminal 111 is damaged when they are separated. For example, the first terminal 111 and the second terminal 1211 can be connected by plugging, magnetic attraction, elastic contact, crimping, or abutting. In this embodiment, the abutting connection of the first terminal 111 and the second terminal 1211 is used as an example for explanation.

[0094] When one of the battery cells 122 malfunctions, the second terminal 1211 of the second circuit board 121 on the battery cell assembly 120 is disengaged from the first terminal 111, and the malfunctioning battery cell assembly 120 can be removed and replaced.

[0095] Because the second terminal 1211 and the first terminal 111 form a non-destructive electrical connection, replacing the cell assembly 120 will not damage the second terminal 1211 and the first terminal 111, thus reducing the maintenance cost of the battery assembly 100. Furthermore, when there are multiple cell assemblies 120, each cell assembly 120 includes an independent sampling circuit board (second circuit board 121). Therefore, replacing the cell assembly 120 does not affect the normal operation of the remaining cell assemblies 120. Thus, only the faulty cell assembly 120 can be replaced, further reducing the maintenance cost of the battery assembly 100.

[0096] In addition, each cell assembly 120 includes an independent sampling circuit board (second circuit board 121), and the mutual interference between the operating status information of each cell assembly 120 is small, making the operating status information of the cell assembly 120 more accurate.

[0097] Among them, the second circuit board 121 in the multiple battery cell assemblies 120 is connected in series, parallel or mixed with the first circuit board 110.

[0098] exist Figure 2 and Figure 4 The four cells 122 shown can be connected in series or in parallel. They can also be connected in mixed configurations. For example, two cells 122 can be connected in series first, then in parallel with the remaining two cells 122; two cells 122 can be connected in parallel first, then in series with the remaining two cells 122; three cells 122 can be connected in series first, then in parallel with the remaining cell 122; or three cells 122 can be connected in parallel first, then in series with the remaining cell 122.

[0099] In this embodiment, the second circuit board 121 in the multiple cell assemblies 120 is electrically connected through the internal wiring of the first circuit board 110, and the cell 122 in the cell assembly 120 is electrically connected to the second circuit board 121. Thus, the electrical connection between the multiple cells 122 is achieved through the first circuit board 110. Therefore, the first circuit board 110 can not only collect the working status information of each cell 122, but also enable the multiple cells 122 to be electrically connected to external charging and discharging devices. The first circuit board 110 can realize multiple functions, making the structure of the battery assembly 100 more compact and simple.

[0100] In one possible implementation, the abutting force between the second terminal 1211 on the battery cell assembly 120 and the first terminal 111 on the first circuit board 110 can be applied by the body of the laptop. For example, the body has two opposing crossbeams. The side of the battery cell assembly 120 away from the second terminal 1211 abuts against one of the crossbeams, and the side of the first circuit board 110 away from the first terminal 111 abuts against the other crossbeam. The force applied by the two crossbeams to the battery cell assembly 120 and the first circuit board 110 respectively can keep the second terminal 1211 and the first terminal 111 abutting.

[0101] Figure 7 This is a schematic diagram of the structure of the support base in the battery assembly provided in the embodiments of this application; Figure 8 This is another structural schematic diagram of the support base in the battery assembly provided in the embodiments of this application.

[0102] See Figure 2 , Figure 3 , Figure 7 and Figure 8As shown, in another possible embodiment, the battery assembly 100 further includes a support base 130, which includes a first frame 131 and a second frame 132 arranged at intervals along a first direction X. A first circuit board 110 is disposed near the first frame 131, and a cell assembly 120 is disposed near the second frame 132. The cell assembly 120 has a first surface 120a and a second surface 120b opposite to each other along the first direction X. The first surface 120a faces the first frame 131, and the second surface 120b faces the second frame 132. The second circuit board 121 is located on one side of the first surface 120a. The side of the first circuit board 110 facing away from the second circuit board 121 abuts against the first frame 131, and the second surface 120b of each cell assembly 120 abuts against the second frame 132. A first terminal 111 faces the second circuit board 121 and forms a non-destructively separable electrical connection with a second terminal 1211 on the second circuit board 121. The support base 130 can be a rectangular frame with a first direction X, a second direction Y, and a third direction Z. The first circuit board 110 and multiple battery cell assemblies 120 are all located in the support base 130.

[0103] The support base 130 has a frame structure, with a first sidewall 131 and a second sidewall 132 facing each other along a first direction X. The support base 130 also has a third sidewall 133 and a fourth sidewall 134 facing each other along a second direction Y. The first sidewall 131, third sidewall 133, second sidewall 132, and fourth sidewall 134 are sequentially connected end-to-end to form the frame structure of the support base 130. The frame structure of the support base 130 results in a lighter weight. The mounting part 130a is disposed on the periphery of the support base 130.

[0104] A first circuit board 110 is disposed on one side of the first frame 131, and the side of the first circuit board 110 facing away from the cell assembly 120 abuts against the first frame 131. Multiple cell assemblies 120 are disposed close to the second frame 132, and are arranged sequentially along the second direction Y. The second surface 120b of each cell assembly 120 abuts against the second frame 132. A second circuit board 121 is disposed on the first surface 120a of the cell assembly 120.

[0105] The force exerted by the first circuit board 110 abutting against the first frame 131 is the first force, and the force exerted by the battery cell assembly 120 abutting against the second frame 132 is the second force. The first force and the second force are transmitted along the first direction X to the position where the first terminal 111 and the second terminal 1211 are in contact, so that the first terminal 111 and the second terminal 1211 abut against each other.

[0106] The support base 130 supports the cell assembly 120 and the first circuit board 110, which enables the battery assembly 100 to have a complete structure. The support base 130 provides the abutting force between the first terminal 111 and the second terminal 1211, which facilitates the installation of the battery assembly 100 and reduces the impact of the battery assembly 100 on the structure of the electrical equipment.

[0107] It is understandable that when there are multiple battery cell assemblies 120, the multiple battery cell assemblies 120 are arranged along the second direction Y, and the multiple first terminals 111 are all facing the second circuit board 121, and the multiple first terminals 111 form an electrical connection with the second terminals 1211 on different second circuit boards 121 that can be separated without damage.

[0108] Figure 9 This is a partial structural diagram of the first circuit board in the battery assembly provided in an embodiment of this application; Figure 10 This is a schematic diagram of the structure of the second circuit board in the battery assembly provided in the embodiments of this application.

[0109] See Figure 9 and Figure 10 As shown, at least one of the first terminal 111 and the second terminal 1211 is elastic.

[0110] Taking the example of a first terminal 111 having elasticity, the following explanation is provided. For instance, the first terminal 111 may include multiple elastic probes 1111, and the second terminal 1211 may include multiple metal contacts 1211a, with the multiple elastic probes 1111 abutting against the multiple metal contacts 1211a. It is understood that the number of elastic probes 1111 can be the same as the number of metal contacts 1211a, with each elastic probe 1111 abutting against one metal contact 1211a in a one-to-one correspondence. Alternatively, the number of elastic probes 1111 can be different from the number of metal contacts 1211a. Figure 9 and Figure 10 In the embodiment shown, the number of elastic probes 1111 is greater than the number of metal contacts 1211a, and one metal contact 1211a abuts against multiple elastic probes 1111.

[0111] The elastic probe 1111 is elastic, and the elastic force of the elastic probe 1111 can make the first terminal 111 and the second terminal 1211 maintain good contact. The elastic compression of the elastic probe 1111 can also compensate for the dimensional tolerance of the first terminal 111 and the second terminal 1211 along the first direction X.

[0112] In other embodiments, the first terminal 111 may also be an elastic spring, as long as the first terminal is elastic. In other embodiments, the second terminal 1211 may also be elastic.

[0113] Figure 11This is a schematic diagram showing the connection between the first terminal and the second terminal in the battery assembly provided in an embodiment of this application.

[0114] See Figure 11 As shown, in another possible embodiment, the battery assembly 100 further includes a plurality of adapters 160, one end of which abuts against the first terminal 111 and the other end of which abuts against the second terminal 1211.

[0115] The adapter 160 may be elastic, and the two ends of the adapter 160 in the elastic direction respectively abut against the first terminal 111 and the second terminal 1211. The elastic force of the adapter 160 can make the first terminal 111 and the second terminal 1211 maintain good contact. The elastic compression of the adapter 160 can also compensate for the dimensional tolerance of the first terminal 111 and the second terminal 1211 along the first direction X.

[0116] Please continue reading Figure 6 and Figure 8 As shown, the second frame 132 has a snap-fit ​​protrusion 1321 protruding toward the second surface 120b of the cell assembly 120, and the second surface 120b of the cell assembly 120 has a slot 123, in which the snap-fit ​​protrusion 1321 is inserted.

[0117] This prevents the battery cell assembly 120 from wobbling in the support base 130, ensuring that the battery cell assembly 120 is reliably mounted on the support base 130.

[0118] Please continue reading Figure 3 , Figure 7 and Figure 8 As shown, in one possible implementation, the second frame 132 has a first clearance opening 1322, and along the first direction X, the orthographic projection of at least a portion of the second surface 120b of the cell assembly 120 at least partially overlaps with the orthographic projection of the first clearance opening 1322.

[0119] For example, two first clearance openings 1322 are provided at the position aligned with each cell assembly 120, and the second surface 120b of the cell assembly 120 can be exposed at the position corresponding to the first clearance openings 1322.

[0120] When it is necessary to replace one of the battery cell assemblies 120, the operator can press the area on the second side 120b of the battery cell assembly 120 that aligns with the first clearance opening 1322. The battery cell assembly 120 overcomes the elastic force of the first terminal 111 or the second terminal 1211 and moves along the first direction X toward the first circuit board 110. The locking protrusion 1321 disengages from the slot 123, and then the operator can remove the battery cell assembly 120 to be replaced. Through the combined action of the first clearance opening 1322 and the locking protrusion 1321, the installation of the battery cell assembly 120 is reliable and the replacement is convenient.

[0121] Please continue reading Figure 7 and Figure 8 As shown, in one possible implementation, the support base 130 further includes a partition plate 135, the first frame 131, the partition plate 135 and the second frame 132 are arranged sequentially at intervals along the first direction X, the first circuit board 110 abuts between the partition plate 135 and the first frame 131, and the battery cell assembly 120 abuts between the partition plate 135 and the second frame 132.

[0122] The partition plate 135 extends along the second direction Y, and its two ends along the second direction Y are connected to the third frame 133 and the fourth frame 134, respectively. The distance between the partition plate 135 and the first frame 131 is equal to the dimension of the first circuit board 110 along the first direction X, where the dimension of the first circuit board 110 along the first direction X refers to the sum of the thickness of the first plate body 112 and the thickness of the components on the first plate body 112. For example, the first terminal 111 includes a base 1112 and an elastic probe 1111 mounted on the base 1112. Figure 9 An elastic probe 1111 is inserted into the first plate 112 along the first direction X. The base 1112 is disposed on the side of the first plate 112 opposite to the cell assembly 120. The dimension of the first circuit board 110 along the first direction X is the sum of the thicknesses of the first plate 112 and the base 1112. When the first circuit board 110 is mounted on the support 130, the first circuit board 110 can abut against the partition plate 135 and the first frame 131, and the partition plate 135 and the first frame 131 can fix the first circuit board 110.

[0123] The distance between the partition plate 135 and the second frame 132 is equal to the size of the cell assembly 120 along the first direction X. When the cell assembly 120 is installed on the support base 130, the cell assembly 120 can abut between the partition plate 135 and the second frame 132. The partition plate 135 and the second frame 132 can fix the first circuit board 110.

[0124] In other words, the cell assembly 120, the second frame 132, and the first circuit board 110 are all fixed by the components on the support base 130, and the first force between the first circuit board 110 and the first frame 131 is partially transmitted to the partition plate 135, and the second force between the cell assembly 120 and the second frame 132 is partially transmitted to the partition plate 135. As a result, the force on the first terminal 111 and the second terminal 1211 can be reduced, and the first terminal 111 and the second terminal 1211 can be prevented from being damaged due to excessive contact force.

[0125] Furthermore, the thickness direction of the first plate 112 is consistent with the first direction X, that is, the first plate 112 is vertically installed in the support base 130, and the size of the first plate 112 along the thickness direction is small, thereby reducing the space occupied by the first plate 112 along the first direction X.

[0126] Please continue reading Figure 3 , Figure 7 and Figure 8 As shown, the partition plate 135 has a second clearance opening 1351, and the first terminal 111 passes through the second clearance opening 1351 to be electrically connected to the second terminal 1211. Alternatively, the second terminal 1211 may also pass through the second clearance opening 1351 to be electrically connected to the first terminal 111. Alternatively, the adapter 160 passes through the second clearance opening 1351 to electrically connect the first terminal 111 and the second terminal 1211.

[0127] In another possible implementation, the partition plate 135 has a plurality of second clearance openings 1351, which are spaced apart along a second direction Y. A plurality of first terminals 111 are respectively inserted into different second clearance openings 1351 to be electrically connected to different second terminals 1211. Alternatively, the plurality of second terminals 1211 may also be respectively inserted into different second clearance openings 1351 to be electrically connected to the first terminals 111. Alternatively, a plurality of adapters 160 may also be inserted into different second clearance openings 1351 to electrically connect the first terminals 111 and the second terminals 1211.

[0128] The second clearance opening 1351 can avoid the position where the first terminal 111 and the second terminal 1211 are electrically connected, so as to facilitate the electrical connection between the first terminal 111 and the second terminal 1211.

[0129] Please continue reading Figure 7 and Figure 8 As shown, the partition plate 135 has a groove 1352 extending along the second direction Y. The groove 1352 reduces the weight of the partition plate 135. The groove 1352 divides the partition plate 135 into a first partition plate 135a and a second partition plate 135b arranged along the first direction X. The first partition plate 135a abuts against the first circuit board 110, and the second partition plate 135b abuts against the battery cell assembly 120. The positions of the first partition plate 135a and the second partition plate 135b along the first direction X can be flexibly adjusted according to the dimensions of the first circuit board 110 and the battery cell assembly 120.

[0130] Please continue to participate. Figure 2 and Figure 3As shown, the battery assembly 100 also includes a cover plate 150, which covers the first circuit board 110 and is connected to the first frame 131 and the partition plate 135. The cover plate 150 can protect the first circuit board 110.

[0131] Please continue reading Figures 4 to 6 As shown, in one possible embodiment, the battery cell assembly 120 further includes a protective housing 124, in which the second circuit board 121 and the battery cell 122 are both located. The protective housing 124 has a third clearance opening 1241 on one side of the first surface 120a. The third clearance opening 1241 is aligned with the second terminal 1211, and the first terminal 111 passes through the third clearance opening 1241 to abut against the second terminal 1211.

[0132] The protective shell 124 can be made of insulating material. The protective shell 124 can wrap the second circuit board 121 and the battery cell 122 to provide insulation protection for the second circuit board 121 and the battery cell 122. The first surface 120a and the second surface 120b of the battery cell assembly 120 are the first surface 120a and the second surface 120b of the protective shell 124, and the slot 123 is also provided on the protective shell 124.

[0133] The protective housing 124 has a third clearance opening 1241 on one side of the first surface 120a. The third clearance opening 1241 can avoid the second terminal 1211, and the first terminal 111 can pass through the third clearance opening 1241 to abut against the second terminal 1211.

[0134] In one possible implementation, the protective shell 124, the second circuit board 121, and the battery cell 122 are integrally formed by injection molding.

[0135] The second circuit board 121 and the battery cell 122 are placed in an injection mold, and the injection molding material is injected into the mold. After the injection molding material is cured, it forms a protective shell 124 that encloses the second circuit board 121 and the battery cell 122. During the curing process, the second circuit board 121 and the battery cell 122 are reliably connected to the protective shell 124.

[0136] It is understandable that the injection mold has a structure that can form a third clearance opening 1241 and a slot 123.

[0137] Please continue reading Figures 4 to 6 As shown, in one possible embodiment, the battery cell assembly 120 has a third surface 120c and a fourth surface 120d relative to each other along the third direction Z, and the protective shell 124 is provided with a first hollow portion 1242 on one side of the third surface 120c and one side of the fourth surface 120d.

[0138] The middle region of the battery cell 122 along the first direction X and the second direction Y is prone to expansion. The two opposite surfaces of the battery cell assembly 120 along the third direction Z are the third surface 120c and the fourth surface 120d. During injection molding, the injection mold has a structure that allows the formation of a first hollow portion 1242 on the third surface 120c and the fourth surface 120d, so that the protective shell 124 also forms the first hollow portion 1242 on the third surface 120c and the fourth surface 120d. The first hollow portion 1242 can avoid the area of ​​the battery cell 122 that is prone to expansion, preventing the battery cell 122 from being squeezed by the protective shell 124 after expansion. Furthermore, providing the first hollow portion 1242 can also increase the heat dissipation capacity of the battery cell 122.

[0139] In one possible implementation, the characteristic information of the battery cell 122 is printed on the area of ​​the battery cell assembly 120 that is aligned with the first cutout portion 1242.

[0140] The characteristic information of the battery cell 122 can include its rated power, production date, batch number, etc. This characteristic information is printed in the area where the battery cell assembly 120 aligns with the first cutout portion 1242. The characteristic information (such as production date or batch number) of the battery cell 122 can be observed through the first cutout portion 1242, thus indicating whether the battery cell 122 has been replaced, facilitating maintenance personnel's judgment during maintenance. Furthermore, printing the characteristic information provides stronger adhesion to the surface of the battery cell 122 compared to labeling, thereby avoiding the problem of unclear parameters due to damaged labels during replacement.

[0141] Please continue reading Figure 7 and Figure 8 As shown, in one possible implementation, the support base 130 further includes a base plate 136, and the first frame 131 and the second frame 132 are both connected to the base plate 136. The base plate 136 has a plurality of second hollow portions 1361, and the second hollow portions 1361 are aligned with the first hollow portions 1242 along the third direction Z. A reinforcing member 1362 is provided between two adjacent second hollow portions 1361.

[0142] The base plate 136 can support the first circuit board 110 and the battery cell assembly 120. It is understood that the third frame 133, the fourth frame 134 and the partition plate 135 are all connected to the base plate 136. The base plate 136 has a plurality of second cutouts 1361, which are aligned with the first cutouts 1242 along the third direction Z. Thus, while supporting the first circuit board 110 and the battery cell assembly 120, the base plate 136 can avoid affecting the heat dissipation of the battery cell 122.

[0143] A reinforcing member 1362 can be provided between two adjacent second hollow portions 1361. The reinforcing member 1362 can compensate for the reduction in strength of the base plate 136 due to the provision of the second hollow portions 1361. The edge of the cell assembly 120 along the second direction Y can be placed on the reinforcing member 1362.

[0144] This application embodiment also provides a battery cell assembly 120, including a battery cell 122, a second circuit board 121, and a protective shell 124. The second circuit board 121 and the battery cell 122 are fixed by welding via tabs 1221. The second circuit board 121 and the battery cell 122 are integrally molded within the protective shell 124 by injection molding. The protective shell 124 is provided with a third clearance opening 1241 on its first surface 120a, through which the second terminal 1211 of the second circuit board 121 is exposed.

[0145] Each cell assembly 120 is provided with a second circuit board 121, which can acquire the operating status information of the cell 122. The protective shell 124 can support the second circuit board 121 and the cell 122, that is, each cell assembly 120 has a complete structure, which can facilitate the replacement of individual cell assemblies 120. By providing a third clearance opening 1241 on the first surface 120a of the protective shell 124, the second terminal 1211 of the second circuit board 121 is exposed through the third clearance opening 1241 to facilitate electrical connection with other devices.

[0146] 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, comprising: include: A first circuit board (110) having a first terminal (111); A battery cell assembly (120) includes a second circuit board (121) and a battery cell (122), wherein the second circuit board (121) is electrically connected to the battery cell (122); The second circuit board (121) has a second terminal (1211), which forms an electrical connection with the first terminal (111) that can be separated without damage.

2. The battery assembly of claim 1, wherein, The second circuit board (121) is used to collect the working status information of the battery cell (122) that is electrically connected to it, and the first circuit board (110) is used to acquire the working status information collected by the second circuit board (121).

3. The battery assembly of claim 2, wherein, There are multiple battery cell assemblies (120), and each battery cell assembly (120) includes the second circuit board (121) and the battery cell (122) electrically connected to the second circuit board (121); the second circuit board (121) in the multiple battery cell assemblies (120) is connected in series, in parallel or in a mixed manner through the first circuit board (110).

4. The battery assembly of claim 2, wherein, The first circuit board (110) has a plurality of first terminals (111); there are a plurality of battery cell assemblies (120), each of the battery cell assemblies (120) includes a second circuit board (121) and a battery cell (122) electrically connected to the second circuit board (121); the second terminal (1211) in each second circuit board (121) forms a non-destructively separable electrical connection with different first terminals (111); The first circuit board (110) is used to acquire the working status information collected by multiple second circuit boards (121).

5. The battery assembly of claim 4, wherein, At least a portion of the second circuit board (121) includes a second board body (1212) and a plurality of functional devices (1213), the plurality of functional devices (1213) and the second terminal (1211) are all disposed on the second board body (1212), and the second terminal (1211) and the plurality of functional devices (1213) are all electrically connected to the second board body (1212).

6. The battery assembly of claim 5, wherein, The functional device (1213) includes at least one of a power transistor, a fuse, a power meter, and a temperature sensor.

7. The battery assembly of any one of claims 1 to 6, wherein, It also includes a support base (130), which includes a first frame (131) and a second frame (132) spaced apart along a first direction. The first circuit board (110) is disposed near the first frame (131), and the battery cell assembly (120) is disposed near the second frame (132). The battery cell assembly (120) has a first surface (120a) and a second surface (120b) opposite each other along the first direction. The first surface (120a) faces the first frame (131), and the second surface (120b) faces the second frame (132). The second circuit board (121) is located on the side of the first surface (120a) away from the second surface (120b). The first terminal (111) faces the second circuit board (121) and forms a non-destructive electrical connection with the second terminal (1211) on the second circuit board (121).

8. The battery assembly according to claim 7, characterized in that, There are multiple battery cell assemblies (120), and the multiple battery cell assemblies (120) are arranged along the second direction. The first circuit board (110) has multiple first terminals (111). The multiple first terminals (111) are all facing the second circuit board (121), and the multiple first terminals (111) form a non-destructive electrical connection with the second terminals (1211) on different second circuit boards (121).

9. The battery assembly according to claim 8, characterized in that, The side of the first circuit board (110) facing away from the second circuit board (121) abuts against the first frame (131), and the second side (120b) of the cell assembly (120) abuts against the second frame (132).

10. The battery assembly according to claim 9, characterized in that, At least one of the first terminal (111) and the second terminal (1211) is elastic, and the first terminal (111) abuts against the second terminal (1211).

11. The battery assembly according to claim 9, characterized in that, The battery assembly (100) also includes a plurality of adapters (160), one end of which abuts against the first terminal (111) and the other end of which abuts against the second terminal (1211).

12. The battery assembly according to claim 7, characterized in that, The second frame (132) has a snap-fit ​​protrusion (1321) protruding toward the second side (120b) of the cell assembly (120), and the second side (120b) of the cell assembly (120) has a slot (123), and the snap-fit ​​protrusion (1321) is inserted into the slot (123).

13. The battery assembly according to claim 7, characterized in that, The second frame (132) has a first clearance opening (1322), and along the first direction, at least part of the orthographic projection of the second surface (120b) of the cell assembly (120) and the orthographic projection of the first clearance opening (1322) overlap.

14. The battery assembly according to claim 7, characterized in that, The support base (130) further includes a partition plate (135). The first frame (131), the partition plate (135) and the second frame (132) are arranged sequentially at intervals along the first direction. The first circuit board (110) abuts between the partition plate (135) and the first frame (131). The battery cell assembly (120) abuts between the partition plate (135) and the second frame (132).

15. The battery assembly according to claim 14, characterized in that, The partition plate (135) has a second clearance opening (1351); The first terminal (111) passes through the second clearance opening (1351) to be electrically connected to the second terminal (1211); Alternatively, the second terminal (1211) passes through the second clearance opening (1351) to be electrically connected to the first terminal (111); Alternatively, the battery assembly (100) may further include an adapter (160) which passes through the second clearance opening (1351).

16. The battery assembly according to claim 15, characterized in that, There are multiple first terminals (111), second terminals (1211), and second clearance openings (1351); Multiple second clearance openings (1351) are arranged at intervals along the second direction, and multiple first terminals (111) are respectively inserted into different second clearance openings (1351) to be electrically connected to different second terminals (1211); Alternatively, multiple second terminals (1211) may be respectively inserted into different second clearance openings (1351) to be electrically connected to different first terminals (111); Alternatively, there may be multiple adapters (160), each of which is inserted into a different second clearance opening (1351).

17. The battery assembly according to claim 15, characterized in that, The partition plate (135) has a groove (1352) extending in the second direction.

18. The battery assembly according to claim 7, characterized in that, The battery cell assembly (120) further includes a protective shell (124), in which the second circuit board (121) and the battery cell (122) are both located. The protective shell (124) has a third clearance opening (1241) on the side opposite to the first surface (120a) in the first direction. The third clearance opening (1241) is correspondingly provided with the second terminal (1211), and the first terminal (111) passes through the third clearance opening (1241) to abut against the second terminal (1211).

19. The battery assembly according to claim 18, characterized in that, The battery cell (122) includes a tab (1221), and the second circuit board (121) has a third terminal (1214). The third terminal (1214) and the second terminal (1211) are respectively disposed on opposite sides of the second circuit board (121) along the thickness direction of the second circuit board (121). The third terminal (1214) is disposed on the side of the second circuit board (121) close to the battery cell (122). The third terminal (1214) is electrically connected to the tab (1221), and the second terminal (1211) and the third terminal (1214) are electrically connected.

20. The battery assembly according to claim 18, characterized in that, The protective shell (124), the second circuit board (121), and the battery cell (122) are integrally formed by injection molding.

21. The battery assembly according to claim 18, characterized in that, The battery cell assembly (120) has a third surface (120c) and a fourth surface (120d) arranged opposite each other along a third direction. The protective shell (124) has a first hollow portion (1242) on one side of the third surface (120c) and one side of the fourth surface (120d).

22. The battery assembly according to claim 21, characterized in that, The characteristic information of the battery cell (122) is printed on the area where the battery cell assembly (120) is aligned with the first hollow portion (1242).

23. The battery assembly according to claim 21, characterized in that, The support base (130) also includes a base plate (136), the first frame (131) and the second frame (132) are both connected to the base plate (136), the base plate (136) has a plurality of second hollow parts (1361), and the second hollow parts (1361) are aligned with the first hollow parts (1242) along a third direction; A reinforcing member (1362) is provided between two adjacent second hollow portions (1361).

24. A battery cell assembly, characterized in that, include: The battery cell (122) and the second circuit board (121) are fixed to the battery cell (122) by welding tabs (1221); The protective shell (124), the second circuit board (121) and the battery cell (122) are integrally formed in the protective shell (124) by injection molding; The protective shell (124) has a third clearance opening (1241) on the first side (120a), and the second terminal (1211) of the second circuit board (121) is exposed through the third clearance opening (1241).

25. An electrical appliance, characterized in that, It includes a device body and a battery assembly (100) as described in any one of claims 1 to 23 or a cell assembly (120) as described in claim 24, wherein the battery assembly (100) or the cell assembly (120) is connected to the device body.

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