Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, the battery pack has a first direction, the battery pack comprises a box body, a plurality of battery monomers, a busbar and a flexible circuit board, the box body has an accommodating cavity, and the plurality of battery monomers are arranged in the accommodating cavity and are arranged along the first direction; the busbar is arranged in the accommodating cavity and is conductively connected with at least one battery monomer; the flexible circuit board is arranged in the accommodating cavity; the flexible circuit board comprises a first body, a connecting part and a connecting sheet, and the first body is arranged on one side, connected with the busbar, of the battery monomer; the connecting part is connected with the first body; the connecting part comprises a first bonding pad and a second bonding pad which are arranged along a first direction, and the first bonding pad is conductively connected with the second bonding pad; the connecting sheet is conductively connected with the first bonding pad or the second bonding pad; one end, away from the connecting part, of the connecting sheet is conductively connected with one busbar. The flexible circuit board can be used for many times, and the maintenance difficulty and the maintenance cost of the battery pack are reduced.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] The nickel strips of the flexible circuit board inside the battery pack are usually welded to the busbars connecting the individual battery cells, making the connection between the two impossible to disassemble. In this case, when the battery pack fails, the flexible circuit board needs to be scrapped and replaced with a new one, which makes battery pack repair difficult and costly. Utility Model Content

[0003] The purpose of this utility model is to provide a battery pack that solves the problem that existing battery packs require the removal and scrapping of flexible circuit boards when they fail, resulting in difficulties and high repair costs. Another purpose of this application is to provide an electrical device.

[0004] Technical solution: A battery pack according to an embodiment of this application has a first orientation, including:

[0005] The box-shaped enclosure has a receiving cavity;

[0006] Multiple battery cells are disposed in the receiving cavity and arranged along the first direction;

[0007] A busbar is disposed in the receiving cavity, and the busbar is electrically connected to at least one of the battery cells;

[0008] A flexible circuit board is disposed in the receiving cavity;

[0009] The flexible circuit board includes:

[0010] The first body is disposed on the side where the battery cell is connected to the busbar;

[0011] A connecting portion is connected to the first body; the connecting portion includes a first pad and a second pad arranged along the first direction, and the first pad and the second pad are electrically connected.

[0012] A connecting piece is electrically connected to the first pad or the second pad; one end of the connecting piece away from the connecting portion is electrically connected to one of the busbars.

[0013] In some embodiments, the flexible circuit board includes a data acquisition line, a portion of which is embedded in the first body and another portion of which is embedded in the connection portion. The data acquisition line is electrically connected to the first pad and the second pad, respectively.

[0014] In some embodiments, the connecting piece includes:

[0015] Second entity;

[0016] The first welding part is connected to the side of the second body near the connecting part and is electrically connected to one of the first solder pad and the second solder pad;

[0017] The second welded part is connected to the side of the second body away from the first welded part and is used to connect to the busbar;

[0018] The third welding part is connected to the side of the second welding part away from the second body and is used to connect to the busbar;

[0019] When the third welding part is connected to the busbar, the second welding part is not connected to the busbar; when the second welding part is connected to the busbar, the third welding part is disconnected from the second welding part.

[0020] In some embodiments, the connecting piece further includes a weak portion disposed between the second welding portion and the third welding portion, and connected to the second welding portion and the third welding portion respectively.

[0021] In some embodiments, the connecting piece further has a notch, which is formed by the second weld portion, the weak portion, and the third weld portion.

[0022] In some embodiments, the connecting piece further has a plurality of notches, including a first notch and a second notch, the first notch and the second notch being disposed on both sides of the connecting piece along the first direction.

[0023] In some embodiments, the weak portion includes a plurality of weak regions, which are spaced apart along the first direction, and the weak regions are grooves or through holes.

[0024] In some embodiments, the first welded portion, the second body, the second welded portion, the weak portion, and the third welded portion are integrally connected.

[0025] In some embodiments,

[0026] The battery pack includes multiple busbars;

[0027] The flexible circuit board includes a plurality of connecting portions, which are spaced apart along the first direction and are respectively connected to the first body.

[0028] The flexible circuit board further includes a plurality of connecting pieces, each connecting piece being conductively connected to a busbar, and each connecting piece being conductively connected to a first pad or a second pad of a connecting portion.

[0029] Accordingly, the electrical device described in this application includes a battery pack as described in any of the foregoing embodiments.

[0030] Beneficial Effects: Compared with the prior art, a battery pack according to an embodiment of this application has a first direction and includes a housing, multiple battery cells, a busbar, and a flexible circuit board. The housing has a receiving cavity, and the multiple battery cells are disposed in the receiving cavity and arranged along the first direction. The busbar is disposed in the receiving cavity and is electrically connected to at least one battery cell. The flexible circuit board is disposed in the receiving cavity. The flexible circuit board includes a first body, a connecting portion, and a connecting piece. The first body is disposed on the side where the battery cell is connected to the busbar. The connecting portion is connected to the first body. The connecting portion includes a first pad and a second pad arranged along the first direction, and the first pad and the second pad are electrically connected. The connecting piece is electrically connected to the first pad or the second pad. The end of the connecting piece away from the connecting portion is electrically connected to a busbar. This application sets the connecting part of the flexible circuit board as a first pad and a second pad. When the connecting piece is connected to the connecting part, one of the pads can be selected for welding connection. When the battery pack needs to be repaired and the flexible circuit board is replaced, a new connecting piece can be selected to be welded to the remaining pad, avoiding direct removal of the flexible circuit board. This enables the flexible circuit board to be used multiple times, reduces the difficulty of battery pack maintenance, and reduces maintenance costs.

[0031] Compared with the prior art, an electrical device according to an embodiment of this application includes a battery pack as described in any of the foregoing embodiments. It is understood that the electrical device of this application includes all the technical features and effects of the aforementioned battery pack, which will not be repeated here. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the overall structure of a battery pack according to an embodiment of this application;

[0034] Figure 2 This is an exploded view of a battery pack according to an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the structure of a flexible circuit board according to an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the overall structure of a connecting piece according to an embodiment of this application;

[0037] Figure 5 yes Figure 4 Enlarged view of section A;

[0038] Figure 6 This is a schematic diagram of a structure in which a first welding part is connected to a first pad and a third welding part is connected to a busbar, according to an embodiment of this application.

[0039] Figure 7 This is a schematic diagram of a structure in which a first welding part is connected to a second welding pad and a third welding part is connected to a busbar, according to an embodiment of this application.

[0040] Figure 8 This is a schematic diagram of a structure in which a first welding part is connected to a first pad and a second welding part is connected to a busbar, according to an embodiment of this application.

[0041] Figure 9 This is a schematic diagram of a structure in which a first welding part is connected to a second welding pad and the second welding part is connected to a busbar, according to an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100, Housing; 110, Receiving cavity; 200, Battery cell; 300, Busbar; 400, Flexible circuit board; 410, First body; 420, Connecting part; 421, First solder pad; 422, Second solder pad; 430, Connecting piece; 431, Second body; 432, First welding part; 433, Second welding part; 434, Third welding part; 435, Weak part; 4351, Weak area; 436, Notch; 4361, First notch; 4362, Second notch; 440, Acquisition line; X, First direction. Detailed Implementation

[0044] 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 a part of the embodiments of this application, and not all of them. 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.

[0045] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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 on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of 85° to 95° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of 5° is considered parallel.

[0046] It should also be noted that this application uses an arrow labeled X to indicate the first direction X. In this embodiment, the first direction X can be the arrangement direction of multiple battery cells 200, or the arrangement direction of the first pad 421 and the second pad 422. The first direction X is introduced to facilitate the description of the structural positional relationship of the components of the battery pack, thereby making it easier to understand its structure.

[0047] In related technologies, in the integrated busbar assembly of battery packs or battery modules in electric vehicles, flexible circuit boards, nickel sheets, and aluminum busbars need to be interconnected and welded together for cell voltage acquisition. This application specifies that the flexible circuit board has pads for welding the nickel sheets, which are directly welded to these pads. However, the flexible circuit board and nickel sheets can only be welded once; subsequent battery pack repairs require the corresponding flexible circuit board to be scrapped and replaced with a new one. This not only increases the difficulty of repair but also leads to high repair costs.

[0048] In view of this, embodiments of this application provide a battery pack designed to solve the aforementioned problems.

[0049] Please refer to the following: Figure 1 , Figure 2 , Figure 3 and Figure 4This application provides a battery pack with a first direction X, including a housing 100, a plurality of battery cells 200, a busbar 300, and a flexible circuit board 400. The housing 100 has a receiving cavity 110, in which the plurality of battery cells 200 are disposed and arranged along the first direction X; the busbar 300 is disposed in the receiving cavity 110 and is electrically connected to at least one battery cell 200; the flexible circuit board 400 is disposed in the receiving cavity 110; the flexible circuit board 400 includes a first body 4 10. Connecting part 420 and connecting piece 430, the first body 410 is disposed on the side where the battery cell 200 is connected to the busbar 300; the connecting part 420 is connected to the first body 410; the connecting part 420 includes a first pad 421 and a second pad 422 arranged along a first direction X, the first pad 421 and the second pad 422 are electrically connected; the connecting piece 430 is electrically connected to the first pad 421 or the second pad 422; the end of the connecting piece 430 away from the connecting part 420 is electrically connected to a busbar 300.

[0050] In this embodiment, by setting the connecting portion 420 of the flexible circuit board 400 as a first pad 421 and a second pad 422, when the connecting piece 430 is connected to the connecting portion 420, one of the pads can be selected for soldering connection. When the battery pack needs to be repaired and the flexible circuit board 400 is replaced, a new connecting piece 430 can be selected to be soldered to the remaining pad, avoiding direct removal of the flexible circuit board 400, thereby realizing the multiple use of the flexible circuit board 400, reducing the difficulty of battery pack repair, and reducing repair costs.

[0051] Specifically, in this embodiment, the housing 100 is provided with a receiving cavity 110 for accommodating multiple battery cells 200, a busbar 300, and a flexible circuit board 400. The multiple battery cells 200 are arranged in a disk along a first direction X, wherein two adjacent battery cells 200 are welded to one busbar 300 to achieve conductive connection between adjacent battery cells 200. Of course, one of the terminals of the outermost battery cells 200 located at both ends along the first direction X can be conductively connected to only one busbar 300 to achieve series and parallel connection of multiple battery cells 200, as well as input and output of battery cells 200. The flexible circuit board 400 is laid on the terminal side of the multiple battery cells 200, which facilitates the welding connection of the flexible circuit board 400 to the busbar 300 through connecting pieces 430. The first body 410 of the flexible circuit board 400 is spaced apart from the busbar 300 to avoid interference between the first body 410 and the busbar 300, and to facilitate the positioning and fixation of the first body 410. The connecting portion 420 of the flexible circuit board 400 is used to connect with the connecting piece 430, which can be a nickel sheet. In this embodiment, the connecting portion 420 includes a first pad 421 and a second pad 422 arranged at intervals along a first direction X. The connecting piece 430 can be soldered to either the first pad 421 or the second pad 422. By utilizing the first pad 421 and the second pad 422, the flexible circuit board 400 can be reused multiple times. For example, during initial busbar assembly, a connecting piece 430 can be connected to the first pad 421 before battery pack assembly. When the battery pack needs repair, such as replacing a battery cell 200 or a busbar 300, the connecting piece 430 can be disconnected, and a new connecting piece 430 can be soldered to the second pad 422, thus avoiding direct replacement of the flexible circuit board 400. This effectively reduces the difficulty and cost of battery pack repair.

[0052] It should be noted that the flexible circuit board 400 in this embodiment is used to collect voltage and dimension data from each battery cell 200 within the battery pack. The soldering order of the first pad 421 and the second pad 422 of the connecting portion 420 is random. Since the connecting piece 430 can be a nickel sheet, which is significantly cheaper than the first body 410, replacing the connecting piece 430 instead of replacing the entire flexible circuit board 400 effectively reduces costs.

[0053] It should also be noted that the first pad 421 and the second pad 422 mentioned in this application embodiment can have the same structure or different structures, as long as they can complete the welding connection with the connecting piece 430. Of course, the connecting part 420 in this application embodiment can also have more pads, such as three, four, five, etc., as long as there is enough time setting on the connecting part 420, which can further increase the number of times the flexible circuit board 400 can be reused.

[0054] Please refer to the following: Figure 3 and Figure 6 In some embodiments, the flexible circuit board 400 includes a data acquisition line 440, a portion of which is embedded in the first body 410 and another portion of which is embedded in the connection portion 420. The data acquisition line 440 is electrically connected to the first pad 421 and the second pad 422, respectively.

[0055] In this embodiment, the acquisition line 440 is electrically connected to the connector 430 via a pad, and is used to acquire voltage signals on the bus 300. The acquisition line 440 is electrically connected to the first pad 421 and the second pad 422 respectively. The first pad 421 and the second pad 422 can be connected in parallel. If there are more pads, the acquisition line 440 can be electrically connected to more pads simultaneously, thus reducing the number of output lines on the first body 410 and facilitating the connection of the connector 430 to any pad for signal acquisition.

[0056] Please refer to the following: Figure 6 and Figure 7 , Figure 6 The connecting piece 430 is connected to the first solder pad 421. Figure 7 The connector 430 is connected to the second pad 422. It can be understood that initially, the connector 430 can be soldered to the first pad 421, and then soldered to the corresponding bus 300. Specifically, it can be as follows: Figure 6 As shown. When repairing the battery pack, the connected connector 430 can be disconnected. Since the connector 430 is usually thin, it can be disconnected by tearing or cutting. Then, a new connector 430 is replaced. The new connector 430 is soldered to the second solder pad 422, and then soldered to the corresponding busbar 300. Specifically, it can be done as follows: Figure 7 As shown. In this way, the first body 410 of the flexible circuit board 400 is not replaced. Battery repair is achieved by only replacing the connecting piece 430 and the connection position of the connecting piece 430. This allows for the reuse of the flexible circuit board 400, reduces repair costs, and simplifies repair.

[0057] like Figure 4As shown, in some embodiments, the connecting piece 430 includes a second body 431, a first welding portion 432, a second welding portion 433, and a third welding portion 434. The first welding portion 432 is connected to the side of the second body 431 near the connecting portion 420 and is electrically connected to one of the first pad 421 and the second pad 422. The second welding portion 433 is connected to the side of the second body 431 away from the first welding portion 432 and is used to connect to the busbar 300. The third welding portion 434 is connected to the side of the second welding portion 433 away from the second body 431 and is used to connect to the busbar 300. When the third welding portion 434 is connected to the busbar 300, the second welding portion 433 is not connected to the busbar 300. When the second welding portion 433 is connected to the busbar 300, the third welding portion 434 is disconnected from the second welding portion 433.

[0058] In this embodiment, the second body 431 is used to connect the first welding part 432 and the second welding part 433. The first welding part 432 is used to weld to the first pad 421 or the second pad 422 of the connecting part 420. The second welding part 433 is used to connect to the busbar 300. The third welding part 434 is connected to the second welding part 433. The connection between the third welding part 434 and the second welding part 433 can be disconnected. This segmented structure of the connecting piece 430 allows for multiple uses of the connecting piece 430. Compared to directly replacing the connecting piece 430, this further improves the efficiency of the connecting piece 430, thereby further reducing the difficulty and cost of battery repair.

[0059] For details, please refer to the following: Figure 6 and Figure 8 or refer to the following: Figure 7 and Figure 9 In this embodiment, since the third welding part 434 is connected to the end of the second welding part 433 away from the first welding part 432, the third welding part 434 can be preferentially welded to the corresponding busbar 300 when the connecting piece 430 is used for the first time. When battery maintenance requires disconnecting the connection between the busbar 300 and the connecting piece 430, the connection between the second welding part 433 and the third welding part 434 can be disconnected, thus separating the connecting piece 430 from the busbar 300. Correspondingly, the busbar 300, battery cell 200, etc., can be replaced, or other maintenance methods can be performed. After the battery pack maintenance is completed, the second welding part 433 can be welded to the corresponding busbar 300 without replacing the new connecting piece 430, thereby realizing the multiple uses of the connecting piece 430, improving the utilization efficiency of the connecting piece 430, and reducing maintenance costs.

[0060] It should be noted that the second welding part 433 and the third welding part 434 of this application may have the same structure or different structures. Furthermore, the second welding part 433 and the third welding part 434 do not necessarily mean that the connecting piece 430 has only two welding parts that can be welded to the busbar 300. Along the arrangement direction of the second welding part 433 and the third welding part 434, a fourth welding part, a fifth welding part, etc., can be sequentially arranged on the side of the third welding part 434 away from the second welding part 433, thereby further increasing the number of times the connecting piece 430 can be used, and thus improving the efficiency of the connecting piece 430.

[0061] like Figure 5 As shown, in some embodiments, the connecting piece 430 further includes a weak portion 435, which is disposed between the second welding portion 433 and the third welding portion 434, and is connected to the second welding portion 433 and the third welding portion 434 respectively.

[0062] In this embodiment of the application, by providing a weak part 435 between the second welding part 433 and the third welding part 434, it is easier to disconnect the second welding part 433 and the third welding part 434 during battery pack maintenance, reducing the difficulty of disconnecting the second welding part 433 and the third welding part 434, thereby reducing the possibility of the connection between the connecting part 420 and the connecting piece 430 being torn.

[0063] It is understood that the weak portion 435 in the embodiments of this application may have a thickness that is at least partially smaller than the thickness of the second weld portion 433 and the third weld portion 434, so that it is convenient to cut from the position of the weak portion 435 to achieve the disconnection between the second weld portion 433 and the third weld portion 434.

[0064] like Figure 5 As shown, in some embodiments, the connecting piece 430 also has a notch 436, which is formed by the second weld portion 433, the weak portion 435 and the third weld portion 434.

[0065] In this embodiment of the application, by setting a notch 436, it is easier to locate the weak part 435 from the notch 436 position and realize the disconnection at the weak part 435 position.

[0066] Please continue reading. Figure 5 In some embodiments, the connecting piece 430 also has a plurality of notches 436, the plurality of notches 436 including a first notch 4361 and a second notch 4362, the first notch 4361 and the second notch 4362 being disposed on both sides of the connecting piece 430 along the first direction X.

[0067] In this embodiment of the application, the first notch 4361 and the second notch 4362 are disposed opposite to each other on both sides of the connecting piece 430. At this time, the weak part 435 can be disconnected from the position of the first notch 4361 and / or the second notch 4362, thereby improving operability.

[0068] Please continue reading. Figure 5 In some embodiments, the weak portion 435 includes a plurality of weak areas 4351, which are spaced apart along the first direction X, and the weak areas 4351 are grooves or through holes.

[0069] In this embodiment of the application, by setting multiple weak areas 4351, where the weak area 4351 can be a through hole or a groove, it can be understood that the thickness of the weak area 4351 at the through hole or groove is less than the thickness of the second connecting part 420 and the third connecting part 420. In this way, the weak part 435 can maintain the reliability of the connection with the second welding part 433 and the third welding part 434, while making it easier for the weak part 435 to be cut off.

[0070] In some embodiments, the first welded portion 432, the second body 431, the second welded portion 433, the weak portion 435, and the third welded portion 434 are integrally connected.

[0071] In this embodiment of the application, the components of the connecting piece 430 are arranged sequentially and integrally connected. This structure facilitates the direct integral molding of the connecting piece 430 and also maintains the uniformity of strength of the area of ​​the connecting piece 430 except for the weak part 435.

[0072] Please refer to the following: Figure 1 , Figure 2 , Figure 3 and Figure 6 In some embodiments, the battery pack includes a plurality of busbars 300; the flexible circuit board 400 includes a plurality of connection portions 420, which are spaced apart along the first direction X and are respectively connected to the first body 410; the flexible circuit board 400 also includes a plurality of connecting pieces 430, each connecting piece 430 being electrically connected to one of the busbars 300, and each connecting piece 430 being electrically connected to a first pad 421 or a second pad 422 of one of the connection portions 420.

[0073] In this embodiment, multiple busbars 300 are welded to corresponding battery cells 200, and multiple connecting pieces 430 are connected to corresponding busbars 300. Each connecting piece 430 and the connecting portion 420 of the flexible circuit board 400 connected to it are the same as those in the previous embodiment. This enables the flexible circuit board 400 to be disconnected from the multiple busbars 300 as a whole, and allows for the re-welding of the flexible circuit board 400 after maintenance by changing the corresponding welding position.

[0074] Accordingly, the electrical device described in this application includes a battery pack as described in any of the foregoing embodiments.

[0075] It is understood that the electrical device of this application includes all the technical features and effects of the aforementioned battery pack, which will not be repeated here.

[0076] Of course, the electrical devices referred to in this application can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0077] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0078] The battery pack and power device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these 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 pack, characterized in that, Having a first direction, including: The box-shaped enclosure has a receiving cavity; Multiple battery cells are disposed in the receiving cavity and arranged along the first direction; A busbar is disposed in the receiving cavity, and the busbar is electrically connected to at least one of the battery cells; A flexible circuit board is disposed in the receiving cavity; The flexible circuit board includes: The first body is disposed on the side where the battery cell is connected to the busbar; A connecting portion is connected to the first body; the connecting portion includes a first pad and a second pad arranged along the first direction, and the first pad and the second pad are electrically connected. A connecting piece is electrically connected to the first pad or the second pad; one end of the connecting piece away from the connecting portion is electrically connected to one of the busbars.

2. The battery pack according to claim 1, characterized in that, The flexible circuit board includes a data acquisition line, a portion of which is embedded in the first body and another portion of which is embedded in the connecting portion. The data acquisition line is electrically connected to the first pad and the second pad, respectively.

3. The battery pack according to claim 1, characterized in that, The connecting piece includes: Second entity; The first welding part is connected to the side of the second body near the connecting part and is electrically connected to one of the first solder pad and the second solder pad; The second welded part is connected to the side of the second body away from the first welded part and is used to connect to the busbar; The third welding part is connected to the side of the second welding part away from the second body and is used to connect to the busbar; When the third welding part is connected to the busbar, the second welding part is not connected to the busbar; when the second welding part is connected to the busbar, the third welding part is disconnected from the second welding part.

4. The battery pack according to claim 3, characterized in that, The connecting piece also includes a weak portion, which is disposed between the second welding portion and the third welding portion, and is connected to the second welding portion and the third welding portion respectively.

5. The battery pack according to claim 4, characterized in that, The connecting piece also has a notch, which is formed by the second welded portion, the weak portion, and the third welded portion.

6. The battery pack according to claim 5, characterized in that, The connecting piece also has a plurality of notches, including a first notch and a second notch, the first notch and the second notch being disposed on both sides of the connecting piece along the first direction.

7. The battery pack according to claim 4, characterized in that, The weak part includes multiple weak areas, which are spaced apart along the first direction. The weak areas are grooves or through holes.

8. The battery pack according to claim 4, characterized in that, The first welded part, the second body, the second welded part, the weak part, and the third welded part are integrally connected.

9. The battery pack according to claim 1, characterized in that, The battery pack includes multiple busbars; The flexible circuit board includes a plurality of connecting portions, which are spaced apart along the first direction and are respectively connected to the first body. The flexible circuit board further includes a plurality of connecting pieces, each connecting piece being conductively connected to a busbar, and each connecting piece being conductively connected to a first pad or a second pad of a connecting portion.

10. An electrical device, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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