Pouch battery and power tool

Abstract

The application discloses a soft package battery and an electric tool, and relates to the battery technical field.The soft package battery comprises a shell, an electric core arranged in the shell and a circuit board assembly; the circuit board assembly comprises a first circuit board, a second circuit board and a third circuit board; the first circuit board is arranged at the top of the electric core and is electrically connected with the second circuit board and the third circuit board respectively; the second circuit board is arranged adjacent to the side wall of the electric core and is electrically connected with the electric core; and the third circuit board is arranged in parallel with the second circuit board at intervals. The soft package battery can improve the space utilization rate and cooperate the heat dissipation of multiple circuit boards through the excellent layout of the multiple circuit boards.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and more specifically, to a soft-pack battery and a power tool. Background Technology

[0002] Due to their advantages such as high energy density and flexible shape, pouch batteries are gradually being used in power tools, portable devices, and other fields. Pouch batteries require an internal circuit board to monitor and control the battery cells.

[0003] To achieve high energy density and reliable operation, the circuit boards and cells of pouch cells need to be compactly arranged within the three-dimensional space of the casing to minimize battery volume while improving heat dissipation efficiency. Therefore, it is urgent to adjust the internal layout of pouch cells to coordinate heat dissipation and volume constraints of the circuit boards within a limited space. Utility Model Content

[0004] The purpose of this invention is to provide a soft-pack battery and power tool that can improve space utilization while coordinating heat dissipation of multiple circuit boards.

[0005] The embodiments of this utility model are implemented as follows:

[0006] In one aspect, this utility model provides a soft-pack battery, including a housing, a battery cell disposed within the housing, and a circuit board assembly; the circuit board assembly includes a first circuit board, a second circuit board, and a third circuit board; the first circuit board is disposed on the top of the battery cell and is electrically connected to the second circuit board and the third circuit board respectively; the second circuit board is disposed adjacent to the side wall of the battery cell and is electrically connected to the battery cell; the third circuit board is arranged parallel to and spaced apart from the second circuit board.

[0007] Optionally, a bracket is also provided inside the housing. The bracket has a first mounting plate and a second mounting plate that are perpendicular to each other. The first mounting plate, the second mounting plate and the inner wall of the housing enclose a cavity for accommodating the battery cell. A first circuit board is disposed on the side of the first mounting plate away from the battery cell. A second circuit board is disposed on the side of the second mounting plate close to the battery cell. A third circuit board is disposed on the side of the second mounting plate away from the battery cell.

[0008] Optionally, both the second and third circuit boards have a preset distance from the second mounting plate.

[0009] Optionally, the projection outline of the second circuit board along the direction perpendicular to the second mounting plate completely covers the projection outline of the third circuit board along the direction perpendicular to the second mounting plate.

[0010] Optionally, the bracket further includes a first side plate and a second side plate that are opposite to and spaced apart. The first side plate and the second side plate are respectively connected to a first mounting plate and a second mounting plate on both sides in the width direction. A first limiting plate is protruding from the inner wall of the first side plate, and a second limiting plate is protruding from the inner wall of the second side plate that is opposite to the first limiting plate. The first limiting plate and the second limiting plate are both parallel and spaced apart from the second mounting plate to form an accommodating space for mounting the second circuit board. The side of the second circuit board facing away from the second mounting plate abuts against the first limiting plate and the second limiting plate respectively.

[0011] Optionally, the inner wall of the housing is provided with a limiting part, which has a limiting slot, and the edge of the third circuit board is engaged in the limiting slot.

[0012] Optionally, there are two limiting parts, which are respectively disposed on opposite sides of the third circuit board, and the two side edges of the third circuit board are respectively engaged in the corresponding limiting slots.

[0013] Optionally, the housing includes an upper shell and a lower shell; the upper shell and the lower shell are interlocked and fixedly connected by multiple fasteners, and the third circuit board is disposed between two fasteners along the width direction of the housing.

[0014] Optionally, there are multiple battery cells stacked together; the first circuit board is configured to perform status monitoring and control of each battery cell; the second circuit board is used to solder the tabs of multiple battery cells so that the multiple battery cells are connected in series; the third circuit board is provided with a display device or connected to a display device, and the third circuit board is used to collect the battery cell's power status and / or charge / discharge status, and display the battery cell's power status and / or charge / discharge status through the display device.

[0015] In another aspect, this utility model provides an electric tool that can be detachably fitted with the aforementioned pouch battery.

[0016] The beneficial effects of this utility model include:

[0017] The aforementioned pouch battery includes a casing, a battery cell housed within the casing, and a circuit board assembly. The circuit board assembly comprises a first circuit board, a second circuit board, and a third circuit board, achieving a modular design for battery functionality. Compared to a single circuit board integrating multiple functions, this improves the execution efficiency and reliability of each function. The first circuit board is positioned on top of the battery cell and electrically connected to both the second and third circuit boards, fully utilizing the space on top of the battery cell. This compact layout of the first circuit board and the battery cell in three-dimensional space helps reduce the overall volume of the pouch battery and improves space utilization within the casing. The second circuit board is adjacent to and electrically connected to the sidewall of the battery cell, improving the heat dissipation efficiency of both the circuit board assembly and the battery cell. The third circuit board is arranged parallel to and spaced apart from the second circuit board, effectively reducing mutual interference between electronic components on the circuit board, improving the stability and accuracy of circuit signal transmission, and the parallel arrangement facilitates airflow for heat dissipation within the battery, further enhancing the heat dissipation efficiency of the circuit board assembly. Thus, the aforementioned pouch battery can improve space utilization while simultaneously promoting heat dissipation across multiple circuit boards. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 One of the structural schematic diagrams of the soft-pack battery provided in the embodiments of this utility model;

[0020] Figure 2 One of the assembly diagrams of the second circuit board and the housing provided in this embodiment of the utility model;

[0021] Figure 3 This is a second schematic diagram of the assembly of the second circuit board and the housing provided in an embodiment of the present utility model;

[0022] Figure 4 This is the second schematic diagram of the structure of the soft-pack battery provided in the embodiment of this utility model;

[0023] Figure 5 This is a magnified view of the details at point A.

[0024] Icons: 100-Pack battery; 110-Shell; 111-Limiting part; 1111-Limiting slot; 112-Upper shell; 113-Lower shell; 120-Battery cell; 121-Electrical tab; 131-First circuit board; 132-Second circuit board; 133-Third circuit board; 140-Bracket; 141-First mounting plate; 142-Second mounting plate; 143-First side plate; 1431-First limiting plate; 144-Second side plate; 1441-Second limiting plate; 145-Accommodation space; 150-Fixing component; a-Width direction. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Please refer to Figure 1 This embodiment provides a soft-pack battery 100, including a housing 110, a battery cell 120 disposed within the housing 110, and a circuit board assembly; the circuit board assembly includes a first circuit board 131, a second circuit board 132, and a third circuit board 133; the first circuit board 131 is disposed on the top of the battery cell 120 and is electrically connected to the second circuit board 132 and the third circuit board 133 respectively; the second circuit board 132 is disposed adjacent to the side wall of the battery cell 120 and is electrically connected to the battery cell 120; the third circuit board 133 is arranged parallel to and spaced apart from the second circuit board 132.

[0032] Specifically, such as Figure 1 As shown, the housing 110 includes an upper shell 112 and a lower shell 113 that interlock with each other. The upper shell 112 and the lower shell 113 interlock to form a closed space to protect the battery cells 120 and circuit board assembly disposed inside the housing 110. There are multiple battery cells 120, which are stacked and used to store electrical energy. The circuit board assembly is a collection of functional modules for battery management, battery cell 120 connection, and status display. It includes a first circuit board 131, a second circuit board 132, and a third circuit board 133 that are electrically connected to achieve a modular design of battery functions.

[0033] In one specific embodiment of this application, the first circuit board 131 is configured to perform status monitoring and control of each battery cell 120, such as collecting parameters like voltage and charging / discharging current of each battery cell 120 to achieve comprehensive monitoring of the battery cells 120. Based on the monitoring data, the first circuit board 131 can perform protection controls such as overcharge protection and over-discharge protection, and work in coordination with a power tool or charger connected to the pouch battery 100 via signals to ensure that the battery operates within a safe range. The second circuit board 132 is used to solder the tabs 121 of multiple battery cells 120 to connect the multiple battery cells 120 in series, and simultaneously provides preliminary positioning constraints for the battery cells 120 through its own structure. The third circuit board 133 is equipped with or connected to a display device, and is used to collect the charge status of the battery cells 120 and display the charge status of the battery cells 120 through the display device. The charge status can include the charge status during charging, the charge status during discharging, and the charge status when not in use. Preferably, the display device is an LED indicator or a display screen. This setup allows for real-time status display, enhancing the user experience. For example, different colors / numbers of LEDs can indicate battery level or the display screen can show the battery status, enabling users to intuitively judge the battery status and avoid affecting device use due to insufficient power, thus improving the user experience.

[0034] Among them, such as Figure 1 As shown, the first circuit board 131 and the second circuit board 132 are perpendicular to each other and located on both sides of the battery cell 120. The third circuit board 133 is arranged parallel to and spaced apart from the second circuit board 132 to improve the heat dissipation efficiency of each circuit board and also improve the space utilization inside the housing 110.

[0035] It should be noted that, in one possible implementation of this application, please refer to... Figure 1 , Figure 2 and Figure 3 The housing 110 is also provided with a bracket 140, which has a first mounting plate 141 and a second mounting plate 142 that are perpendicular to each other. The first mounting plate 141, the second mounting plate 142 and the inner wall of the housing 110 form a receiving cavity for accommodating the battery cell 120. The first circuit board 131 is disposed on the side of the first mounting plate 141 away from the battery cell 120. The second circuit board 132 is disposed on the side of the second mounting plate 142 close to the battery cell 120. The third circuit board 133 is disposed on the side of the second mounting plate 142 away from the battery cell 120.

[0036] Specifically, such as Figure 1 and Figure 3As shown, the first mounting plate 141 and the second mounting plate 142 are L-shaped to improve the connection stability of the bracket 140 and prevent the electrode tab 121 from breaking due to shaking during transportation or use, as the battery cell 120 located in the accommodating cavity formed by the bracket 140 and the inner wall of the housing 110 is located in the cavity.

[0037] The first circuit board 131 is disposed on the side of the first mounting plate 141 away from the battery cell 120, so that the first circuit board 131 and the battery cell 120 are physically isolated, preventing the battery cell 120 from directly conducting heat to the first circuit board 131, avoiding high temperature from affecting the sensitivity of the first circuit board 131, and improving the accuracy of battery status monitoring.

[0038] like Figure 1 As shown, the second circuit board 132 is disposed on the side of the second mounting plate 142 near the battery cell 120, close to the tab 121 of the battery cell 120, shortening the soldering path, reducing connection resistance, and reducing energy loss during charging and discharging. The tab 121 is directly soldered to the second circuit board 132, which enhances the structural stability of the series connection of the battery cells 120. Combined with the constraint of the accommodating cavity, it prevents the tab 121 from detaching due to displacement of the battery cell 120, thus improving the connection stability between the second circuit board 132 and the battery cell 120.

[0039] like Figure 1 As shown, the third circuit board 133 and the second circuit board 132 are located on opposite sides of the second mounting plate 142. The second mounting plate 142 serves as a physical partition between the third circuit board 133 and the second circuit board 132, thereby improving the uniformity of overall heat dissipation without increasing the size of the soft-pack battery 100.

[0040] Optionally, both the second circuit board 132 and the third circuit board 133 have a preset distance from the second mounting plate 142. This distance provides a channel for air convection, allowing the heat generated by the second circuit board 132 and the third circuit board 133 during operation to be conducted to the distance and then dissipated through the housing 110. This prevents heat accumulation, reduces the impact of high temperatures on sensitive components on the third circuit board 133, and improves the stability of the display circuit. Furthermore, the preset distance facilitates the placement of components, such as the wiring connecting the first circuit board 131 and the second circuit board 132, making the wiring between them more flexible and reducing bending stress. It also provides operating space for the installation and disassembly of circuit board assemblies, improving production and maintenance efficiency.

[0041] The aforementioned soft-pack battery 100 includes a housing 110, a battery cell 120 disposed within the housing 110, and a circuit board assembly. The circuit board assembly includes a first circuit board 131, a second circuit board 132, and a third circuit board 133, realizing a modular design for battery control functions. Compared to a single circuit board integrating multiple control functions, this improves the execution efficiency and reliability of each function. The first circuit board 131 is disposed on top of the battery cell 120 and is electrically connected to the second circuit board 132 and the third circuit board 133, respectively. This fully utilizes the space on top of the battery cell 120, enabling the first circuit board 131 to connect with the battery cell 120 in three-dimensional space. The compact layout of the core 120 helps reduce the overall volume of the pouch battery 100 and improves the space utilization within the casing 110. The second circuit board 132 is adjacent to the side wall of the core 120 and electrically connected to it, which improves the heat dissipation efficiency of the circuit board assembly and the core 120. The third circuit board 133 is arranged parallel to and spaced apart from the second circuit board 132, which effectively reduces the mutual influence between electronic components on the circuit board, improves the stability and accuracy of circuit signal transmission, and the parallel arrangement facilitates the airflow for heat dissipation inside the battery, further improving the heat dissipation efficiency of the circuit board assembly. The aforementioned pouch battery 100 can improve space utilization while coordinating the heat dissipation of multiple circuit boards.

[0042] For example, the projected outline of the second circuit board 132 along the direction perpendicular to the second mounting plate 142 completely covers the projected outline of the third circuit board 133 along the direction perpendicular to the second mounting plate 142. That is, the size of the third circuit board 133 is less than or equal to the size of the second circuit board 132. The separation of the second and third circuit boards 132 does not increase the width and height of the pouch battery 100, thus achieving miniaturization and compactness of the pouch battery 100. Preferably, the size of the third circuit board 133 is smaller than the size of the second circuit board 132 to avoid interference between the third circuit board 133 and components disposed around it.

[0043] In one possible implementation of this application, such as Figure 2 and Figure 3 As shown, the bracket 140 also includes a first side plate 143 and a second side plate 144 that are opposite to and spaced apart. The first side plate 143 and the second side plate 144 are respectively connected to the first mounting plate 141 and the second mounting plate 142 on both sides in the width direction. The inner wall of the first side plate 143 is provided with a first limiting plate 1431, and the inner wall of the second side plate 144 is provided with a second limiting plate 1441 that is opposite to the first limiting plate 1431. The first limiting plate 1431 and the second limiting plate 1441 are both parallel to and spaced apart from the second mounting plate 142 to form an accommodating space 145 for mounting the second circuit board 132. The side of the second circuit board 132 facing away from the second mounting plate 142 abuts against the first limiting plate 1431 and the second limiting plate 1441 respectively.

[0044] Specifically, such as Figure 2 and Figure 3 As shown, the first side plate 143 and the second side plate 144 have an L-shaped structure, and the battery cell 120 is disposed within the accommodating cavity formed by the first mounting plate 141, the second mounting plate 142, the first side plate 143, the second side plate 144, and the inner wall of the housing 110. The first side plate 143 and the second side plate 144 can limit and fix the battery cell 120 laterally, further improving the placement stability of the battery cell 120. In addition, the arrangement of the first side plate 143 and the second side plate 144 enhances the structural strength of the bracket 140, and can disperse stress when the pouch battery 100 is subjected to external impact, reducing the deformation of the first mounting plate 141 and the second mounting plate 142.

[0045] like Figure 2 As shown, a first limiting plate 1431 protrudes from the inner wall of the first side plate 143, and a second limiting plate 1441 protrudes from the inner wall of the second side plate 144, which is opposite to the first limiting plate 1431. The first limiting plate 1431 and the second limiting plate 1441 are both arranged parallel to and spaced apart from the second mounting plate 142. The side of the second circuit board 132 facing away from the second mounting plate 142 abuts against the first limiting plate 1431 and the second limiting plate 1441 respectively, which can improve the stability of the setting position of the second circuit board 132, ensure the stability of the welding position between the second circuit board 132 and the electrode tab 121 of the battery cell 120, and reduce the risk of connection failure.

[0046] like Figure 3 As shown, the side of the second circuit board 132 facing away from the first limiting plate 1431 and the second limiting plate 1441 has a preset gap with the second mounting plate 142, which can form a heat dissipation channel, allowing the heat generated by the second circuit board 132 during operation to be quickly dissipated through air convection, thus improving circuit stability. A limiting part 111 can be provided on the bottom wall of the housing 110. The limiting part 111 abuts against the side of the second circuit board 132 facing away from the first limiting plate 1431 and the second limiting plate 1441, so as to cooperate with the first limiting plate 1431 and the second limiting plate 1441 to achieve reliable installation of the second circuit board 132.

[0047] Optionally, such as Figure 4 and Figure 5As shown, the inner wall of the housing 110 is provided with a limiting part 111, which is integrated into the inner wall of the housing 110 and does not require additional space inside the housing 110. The limiting part 111 has a limiting slot 1111, and the edge of the third circuit board 133 is engaged in the limiting slot 1111. The limiting slot 1111 forms a mechanical lock on the edge of the third circuit board 133, which can effectively prevent the third circuit board 133 from shifting when the battery shakes or is impacted, reduce the possibility of electrical connection failure between the third circuit board 133 and the first circuit board 131, and improve the stability of the electrical connection.

[0048] Furthermore, such as Figure 4 As shown, there are two limiting parts 111, which are respectively disposed on opposite sides of the third circuit board 133. The two side edges of the third circuit board 133 are respectively engaged in the corresponding limiting slots 1111 to achieve bidirectional engagement and fixation of the third circuit board 133. With this arrangement, the two limiting parts 111 apply force from opposite sides of the third circuit board 133, and the constraint effect of the slots counteracts any possible lateral displacement of the third circuit board 133, further improving the stability of the third circuit board 133.

[0049] In one possible implementation of this application, such as Figure 4 As shown, the housing 110 includes an upper housing 112 and a lower housing 113; the upper housing 112 and the lower housing 113 are interlocked and fixedly connected by multiple fasteners 150. A third circuit board 133 is disposed between two fasteners 150 along the width direction a of the housing 110. Preferably, the fasteners 150 are bolts. The two fasteners 150 on both sides of the third circuit board 133 are arranged relatively spaced to ensure the connection stability between the upper housing 112 and the lower housing 113; the dimension of the third circuit board 133 along the width direction a of the housing 110 will not interfere with the fasteners 150, so that the assembly and disassembly of the third circuit board 133 and the fasteners 150 do not interfere with each other. During maintenance, the fasteners 150 or the third circuit board 133 of the housing 110 can be disassembled separately, improving the convenience of operation. Moreover, in this embodiment, the third circuit board 133 is installed using the space between the two fasteners 150, making full use of the internal space of the housing 110, making the soft-pack battery 100 more compact in structure, smaller in overall size, and more convenient to use.

[0050] In another aspect, this utility model provides an electric tool that can be detachably fitted with the aforementioned pouch battery 100.

[0051] Specifically, the power tool can slide and engage with the sliding groove on the housing 110 of the pouch battery 100 through its own sliding groove structure, allowing the pouch battery 100 to be quickly inserted into or removed from the power tool in a specific direction, simplifying the installation and removal operation. The pouch battery 100 is provided with terminals, which can precisely align with the electrode plates on the power tool after the battery pack is slidably engaged with the power tool, forming an electrical connection to supply power to the power tool.

[0052] The aforementioned power tools, through the well-designed arrangement of multiple circuit boards within the pouch battery 100, are able to stably output power, ensuring the continuous and stable operation and reliable use of the power tools. The specific structure and beneficial effects of the pouch battery 100 have already been detailed above and will not be repeated here.

[0053] The above description is merely an optional embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

Claims

1. A soft-pack battery, characterized in that, The device includes a housing (110), a battery cell (120) disposed within the housing (110), and a circuit board assembly. The circuit board assembly includes a first circuit board (131), a second circuit board (132), and a third circuit board (133). The first circuit board (131) is disposed on the top of the battery cell (120) and is electrically connected to the second circuit board (132) and the third circuit board (133), respectively. The second circuit board (132) is disposed adjacent to the side wall of the battery cell (120) and is electrically connected to the battery cell (120). The third circuit board (133) is arranged parallel to and spaced apart from the second circuit board (132).

2. The soft-pack battery according to claim 1, characterized in that, The housing (110) is further provided with a bracket (140), the bracket (140) having a first mounting plate (141) and a second mounting plate (142) that are perpendicular to each other. The first mounting plate (141), the second mounting plate (142) and the inner wall of the housing (110) enclose a cavity for accommodating the battery cell (120). The first circuit board (131) is disposed on the side of the first mounting plate (141) away from the battery cell (120). The second circuit board (132) is disposed on the side of the second mounting plate (142) close to the battery cell (120). The third circuit board (133) is disposed on the side of the second mounting plate (142) away from the battery cell (120).

3. The soft-pack battery according to claim 2, characterized in that, The second circuit board (132) and the third circuit board (133) are both spaced apart from the second mounting plate (142).

4. The soft-pack battery according to claim 2 or 3, characterized in that, The projection outline of the second circuit board (132) along the direction perpendicular to the second mounting plate completely covers the projection outline of the third circuit board (133) along the direction perpendicular to the second mounting plate.

5. The soft-pack battery according to claim 2, characterized in that, The bracket (140) further includes a first side plate (143) and a second side plate (144) that are opposite to and spaced apart. The first side plate (143) and the second side plate (144) are respectively connected to the first mounting plate (141) and the second mounting plate (142) on both sides in the width direction (a). The inner wall of the first side plate (143) is provided with a first limiting plate (1431), and the inner wall of the second side plate (144) is provided with a second limiting plate (1441) that is opposite to the first limiting plate (1431). The first limiting plate (1431) and the second limiting plate (1441) are both parallel and spaced apart from the second mounting plate (142) to form an accommodating space for mounting the second circuit board (132). The side of the second circuit board (132) facing away from the second mounting plate (142) abuts against the first limiting plate (1431) and the second limiting plate (1441) respectively.

6. The soft-pack battery according to claim 1, characterized in that, The inner wall of the housing (110) is provided with a limiting part (111), the limiting part (111) has a limiting slot (1111), and the edge of the third circuit board (133) is engaged in the limiting slot (1111).

7. The soft-pack battery according to claim 6, characterized in that, The number of the limiting parts (111) is two and they are respectively disposed on opposite sides of the third circuit board (133), and the two side edges of the third circuit board (133) are respectively locked in the corresponding limiting slots (1111).

8. The soft-pack battery according to claim 1, characterized in that, The housing (110) includes an upper shell (112) and a lower shell (113); the upper shell (112) and the lower shell (113) are interlocked and fixedly connected by a plurality of fasteners (150), and the third circuit board is disposed between two of the fasteners along the width direction (a) of the housing.

9. The soft-pack battery according to claim 1, characterized in that, The number of the battery cells (120) is multiple, and the multiple battery cells (120) are stacked. The first circuit board (131) is configured to perform status monitoring and control of each battery cell (120). The second circuit board (132) is used to solder the tabs (121) of the multiple battery cells (120) so that the multiple battery cells (120) are connected in series. The third circuit board (133) is provided with a display device or connected to a display device. The third circuit board is used to collect the power status of the battery cells (120) and display the power status of the battery cells (120) through the display device.

10. A power tool, characterized in that, The pouch cell (100) of any one of claims 1-9 is removably mounted.

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