Tool battery pack

Abstract

The embodiment of the utility model relates to the field of energy, and discloses a tool battery pack which is provided with a shell assembly, a battery cell assembly, an output pole piece seat and a control device, and the shell assembly is used for containing the battery cell assembly, the output pole piece seat and the control device; the control device is connected with the output pole piece seat and the battery cell assembly; the battery cell assembly is provided with a plurality of unit battery cells and a battery cell support, the control device is arranged on the battery cell support, the control device is provided with a control panel and a connecting piece, the connecting piece is provided with a plate-shaped or sheet-shaped single battery cell detection piece and a connecting pole piece, one end of the connecting pole piece is correspondingly connected with the unit battery cells, and the single battery cell detection piece is provided with a first connecting end and a second connecting end. The other ends of the connecting pole pieces are directly connected with the first connecting end, the first connecting end is integrated with a plurality of connecting pole pieces, and the second connecting end is connected with the control panel through a welding process.

Description

[0001] This application claims priority to the Chinese patent application No. 202520348339.4 filed on February 28, 2025, and entitled "Battery pack", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of energy, in particular to a tool battery pack. BACKGROUND

[0003] In the existing field of tool battery packs, 1 or 2 parallel cell assemblies are usually used as basic units to achieve power output through single-cell grouping structure. The positive and negative electrode ends of each cell unit are welded with nickel sheets or copper-aluminum composite conductive tabs, and an independent wire harness is used to establish electrical connection with the control board (BMS). Specifically, each cell corresponds to a group of independent wire harnesses, one end of the wire harness is fixed to the conductive tab through laser welding or resistance welding, and the other end is connected to the detection port of the control board through plug-in terminals (such as JST, XH2.54, etc.), forming a multi-channel voltage, temperature and internal resistance monitoring network.

[0004] This traditional architecture has significant engineering contradictions. First, as the number of cells increases with the increase of battery pack capacity, the number of wire harnesses increases linearly. Taking a typical 18V / 5.0Ah power tool battery pack as an example, when using 2 parallel 5 series 21700 cells, at least 10 groups of independent wire harnesses (including redundant detection channels) are needed, and the wire harness diameter is generally between AWG22-AWG24, occupying about 12%-15% of the internal space volume of the battery pack. This not only limits the improvement of energy density, but also leads to the need to reserve complex wire slot routing space and terminal plug-in area in the shell structure design, forming a vicious cycle of "space-performance".

[0005] Secondly, under dynamic working conditions, the wire harness resonance effect caused by high-frequency vibration (up to 50Hz or more, amplitude ±2mm) of power tools is particularly prominent. The free end of the wire harness is prone to friction with adjacent cell shells or metal brackets in the unbound state, causing damage to the insulation layer (such as PVC / PET material wire wear rate of 0.25mm 2 ) after 3000 vibration cycles. Statistical data shows that such mechanical fatigue-induced micro-short circuit faults account for 38.6% of tool battery pack repair cases, and are mostly concentrated in stress concentration areas with a wire bending radius less than 5D (D is the wire diameter).

[0006] Furthermore, the waterproof design of the plug-in terminal has inherent defects. The conventional scheme adopts a silica gel sealing ring (hardness 50±5 Shore A) to press and seal, but under the action of frequent plugging (more than 200 plugging cycles) or transverse shear force, the terminal metal pin and the sealing material produce relative displacement, resulting in that the interface sealing pressure decays from the initial 1.5 MPa to below 0.8 MPa, and the IPX7 waterproof level is difficult to maintain. Utility model content

[0007] The utility model provides a tool battery pack, solve the problem that tool battery pack's redundant detection channel and the waterproof design of plug-in terminal have inherent defects.

[0008] A tool battery pack has a shell assembly, a cell assembly, an output pole piece seat and a control device. The shell assembly is used for accommodating the cell assembly, the output pole piece seat and the control device. The control device is connected with the output pole piece seat and the cell assembly. The cell assembly has a plurality of unit cells and a cell support. The control device is arranged on the cell support and has a control board and a connecting piece. The connecting piece has a sheet-shaped single-cell detection piece and a connecting pole piece. One end of the connecting pole piece is connected with the unit cells correspondingly. The single-cell detection piece has a first connecting end and a second connecting end. The other end of the connecting pole piece is directly connected with the first connecting end. The first connecting end integrates a plurality of connecting pole pieces. The second connecting end is connected with the control board through a welding process. Compared with the loose architecture of the traditional tool battery pack, that is, the "discrete wire harness + plug-in terminal", the tool battery pack of the utility model solves the problem of the waterproof design defects of the redundant detection channel and the plug-in terminal. The utility model replaces the discrete wire harness with the sheet-shaped single-cell detection piece and realizes the integration of the detection paths of N unit cells on a single connecting piece through the multi-pole piece integrated layout, thereby comprehensively upgrading the tool battery pack in terms of space utilization, dynamic reliability, signal accuracy and environmental tolerance, and especially being suitable for the industrial-grade electric tool scene under high-vibration and high-humidity working conditions.

[0009] Optionally, the second connecting end has at least first pads corresponding to the number of unit cells. Each first pad is directly connected with the second connecting end of the single-cell detection piece through a welding process to form an independent electrical channel, thereby eliminating the common ground interference of the traditional wire harness.

[0010] Optionally, the control board has at least second pads corresponding to the number of first pads of the second connecting end. The precise number of the second pads of the control board and the first pads of the connecting piece are matched, thereby upgrading the loose architecture of the "discrete wire harness + plug-in terminal" to the integrated paradigm of "pad matrix - rigid interconnection", and completely solving the electrical failure and mechanical fatigue problems of the tool battery pack under high-vibration and high-humidity working conditions.

[0011] Optionally, the area of the first pad is less than or equal to the area of the second pad. By making the area of the first pad less than or equal to the area of the second pad, the smaller area of the first pad allows it to completely adhere to the larger second pad, reducing the risk of short circuiting between adjacent pads, thereby improving the safety and reliability of the circuit, providing good thermal conduction and electrical connection, while the smaller pad exerts force on the larger pad during thermal expansion, which can reduce the mechanical stress caused by thermal expansion and contraction, thereby reducing the fatigue and potential cracking of the solder joint. This configuration can increase the mechanical strength of the solder joint and improve the stability and durability of the connection.

[0012] Optionally, the first pad has at least one through-hole passing through the first pad. By providing a through-hole, the penetration ability of the solder during soldering is enhanced, the mechanical strength and the firmness of the conductive connection are improved, and the through-hole allows the solder to fill better, forming a more solid and better conductive connection.

[0013] Optionally, the ratio of the hole diameter of the through-hole to the pad width of the first pad is less than or equal to 1:2. By setting the ratio of the hole diameter of the through-hole to the pad width of the first pad to be less than or equal to 1:2, the penetration ability of the solder during soldering is enhanced, the mechanical strength and the firmness of the conductive connection are improved, and the through-hole allows the solder to fill better, forming a more solid and better conductive connection.

[0014] Optionally, the minimum distance e between adjacent pads is greater than or equal to 0.2mm and less than or equal to 2mm. By setting the minimum distance e between adjacent pads to be greater than or equal to 0.2mm and less than or equal to 2mm, the risk of short circuiting due to solder bridging or conductive particle contamination can be effectively reduced, and the manufacturing process can also be reduced. The deviation caused by the soldering defect increases the tolerance of the error during manufacturing and operation, enhances the safety and reliability of the overall circuit, prevents cross-talk problems between signals, improves the integrity and transmission efficiency of the signals, and effectively dissipates heat in each pad area, avoiding local overheating problems caused by excessive concentration. The increase in the distance between pads allows better heat diffusion and management.

[0015] Optionally, the distance f between the peripheral components and the adjacent first pad is greater than or equal to 1mm and less than or equal to 25mm. Increasing the distance between the pads and the peripheral components can help reduce the mutual influence of electromagnetic interference. This physical isolation can reduce signal coupling on the circuit board, improve signal integrity, and ensure more stable electrical performance. At the same time, a larger distance between components and pads reduces the risk of short circuiting due to accidental contact or material bridging (such as solder overflow), providing a larger safety margin for production and subsequent equipment operation. Furthermore, the increased distance improves the heat dissipation capacity of the circuit board, allowing heat to be more effectively conducted away from high-heat areas, preventing local overheating and heat accumulation problems.

[0016] Optionally, the distance f between the peripheral component and the adjacent second pad is greater than or equal to 1 mm and less than or equal to 25 mm. The distance between the pad and the peripheral component can be increased to help reduce the mutual influence of electromagnetic interference. Such physical isolation can reduce signal coupling on the circuit board, improve signal integrity, ensure more stable electrical performance, and reduce the risk of short circuit caused by accidental contact or material bridging (such as solder overflow), thereby providing greater safety margin for production and subsequent equipment operation. In addition, the increased distance improves the heat dissipation capacity of the circuit board, allowing heat to be more effectively conducted away from the high-heat area, preventing local overheating and heat accumulation.

[0017] Optionally, the tin plating thickness of the first pad is 0.05-0.15 mm. This can reduce excessive flow of solder during soldering, reduce the risk of forming a solder bridge and short circuit, and thus improve the electrical isolation effect of the soldering area.

[0018] Optionally, the tin plating thickness of the second pad is 0.05-0.15 mm. This can reduce excessive flow of solder during soldering, reduce the risk of forming a solder bridge and short circuit, and thus improve the electrical isolation effect of the soldering area. BRIEF DESCRIPTION OF DRAWINGS

[0019] One or more embodiments are illustrated by way of example in the figures that form a part of this patent document. These example are not intended to limit the application.

[0020] Figure 1 A top perspective view of a tool battery pack is provided by an embodiment of the application;

[0021] Figure 2 A bottom perspective view of a tool battery pack is provided by an embodiment of the application;

[0022] Figure 3 An internal structure diagram of a tool battery pack is provided by an embodiment of the application;

[0023] Figure 4 An exploded view of the internal structure of a tool battery pack is provided by an embodiment of the application;

[0024] Figure 5 A sectional view of a unit cell is provided by an embodiment of the application;

[0025] Figure 6 A first end face perspective view of a waterproof plate of a tool battery pack is provided by an embodiment of the application;

[0026] Figure 7 A second end face perspective view of a waterproof plate of a tool battery pack is provided by an embodiment of the application;

[0027] Figure 8 A partially enlarged sectional view of a waterproof plate A of a tool battery pack provided by an embodiment of the present application;

[0028] Figure 9 An assembly relationship of a partial waterproof plate, a waterproof layer, a cell support, and a unit cell provided by an embodiment of the present application;

[0029] Figure 10 A partial sectional view of an internal structure of a tool battery pack hidden behind a waterproof plate and a waterproof layer provided by an embodiment of the present application;

[0030] Figure 11 A perspective view of an output electrode seat provided by an embodiment of the present application;

[0031] Figure 12 A front view of an output electrode seat provided by an embodiment of the present application;

[0032] Figure 13 An internal structure diagram of a tool battery pack provided by an embodiment of the present application;

[0033] Figure 14 A perspective view of a connecting piece provided by an embodiment of the present application;

[0034] Figure 15 A front view of a first welding seat provided by an embodiment of the present application;

[0035] Figure 16 A front view of a second welding seat provided by an embodiment of the present application;

[0036] Figure 17 A temperature change data diagram of a 60V cell and a cell end face in a 30A discharge mode provided by an embodiment of the present application. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and based on various changes and modifications of the following embodiments. The division of the following embodiments is for the convenience of description, and should not constitute any limitation on the specific implementation of the present application. The embodiments can be combined and referenced with each other on the premise of no contradiction.

[0038] According to the background art, in the field of existing tool-type battery packs, a 1-parallel or 2-parallel cell assembly is usually used as a basic unit, and the electrical energy output is realized through a single-cell grouping structure. The positive and negative electrode ends of each cell unit are welded with nickel sheets or copper-aluminum composite conductive tabs, and an independent wire harness is used to establish electrical connection with the control board (BMS). Specifically, each cell corresponds to a group of independent wire harnesses, one end of the wire harness is fixed to the conductive tab through laser welding or resistance welding, and the other end is connected to the detection port of the control board through plug-in terminals (such as JST, XH2.54, etc.), forming a multi-channel voltage, temperature and internal resistance monitoring network.

[0039] This traditional architecture has significant engineering contradictions: first, as the number of cells increases with the increase of battery pack capacity, the number of wire harnesses increases linearly. Taking a typical 18V / 5.0Ah power tool battery pack as an example, when using 21700 cells in a 2-parallel 5-series structure, at least 10 groups of independent wire harnesses (including redundant detection channels) are needed, and the wire harness diameter is generally between AWG22-AWG24, occupying about 12%-15% of the internal space volume of the battery pack. This not only limits the improvement of energy density, but also causes the shell structure design to have to reserve complex wire slot routing space and terminal plug-in area, forming a vicious cycle of "space-performance".

[0040] Secondly, under dynamic working conditions, the wire harness resonance effect caused by the high-frequency vibration (up to 50Hz or more, amplitude ±2mm) of the power tool is particularly prominent. The free end of the wire harness is prone to friction with the adjacent cell shell or metal bracket in the unbound state, causing damage to the insulation layer (such as PVC / PET wire material with a wear rate of 0.25mm 2 ) after 3000 vibration cycles. Statistical data shows that such mechanical fatigue-induced micro-short circuit faults account for 38.6% of tool battery pack repair cases, and are mostly concentrated in stress concentration areas with a wire bending radius less than 5D (D is the wire diameter).

[0041] Furthermore, the waterproof design of the plug-in terminal has inherent defects. The conventional solution uses a silicone seal ring (hardness 50±5 Shore A) to press and prevent water, but under the action of frequent plugging (more than 200 plugging cycles) or transverse shear force, the terminal metal pin and the sealing material produce relative displacement, causing the interface sealing pressure to decay from the initial 1.5MPa to below 0.8MPa, making it difficult to maintain the IPX7 waterproof level.

[0042] The present application inventors found the above defects and analyzed the causes of the defects through the research on the internal temperature of the over-temperature battery cell and thermal runaway battery cell in the tool battery pack and the heat transfer of the whole battery pack, and ingeniously overcame the problems of low production efficiency and low volume of the tool battery pack, and provided a quick pressure relief for the thermal runaway battery cell to avoid secondary thermal runaway of the battery cell, etc., to realize a lightweight, efficient and safe isolation solution

[0043] One embodiment, the application examples will be described in more detail below in conjunction with the drawings:

[0044] Please refer to Figures 1-17 A tool battery pack has a shell assembly 1, a battery cell assembly 2, an output pole piece seat 3, a control device 4;

[0045] The shell assembly 1 has a first heat dissipation port 11, a bracket fixing seat (not shown in the figure), an opening 13, a second heat dissipation port 14, and is used to accommodate the battery cell assembly 2, the output pole piece seat 3 and the control device 4. The opening 13 is arranged at the position corresponding to the output pole piece seat 3 of the shell assembly 1, and is used for the tool pole piece to pass through and connect with the output pole piece seat 3. The second heat dissipation port 14 is arranged on the side of the battery pack with the opening 13. The first heat dissipation port 11 and the second heat dissipation port 14 are arranged on the surface of the shell assembly 1 in opposition. The first heat dissipation port 11 is an air inlet, and the second heat dissipation port 14 is an air outlet. By arranging the first heat dissipation port 11 and the second heat dissipation port 14 to form a linear air channel, the direct ventilation path helps the airflow to pass through the battery pack more efficiently, ensuring that the internal temperature of the battery pack is always maintained within a safe range, significantly improving the heat dissipation efficiency and reducing the risk of explosion caused by overheating of the battery cell. The bracket fixing seat (not shown in the figure) is arranged on at least one side of the shell assembly 1, and is used to fix the battery cell assembly 2 to avoid movement of the battery cell bracket 22 in the shell assembly 1. The total area of the first heat dissipation port 11 is greater than that of the second heat dissipation port 14. The airflow enters the shell assembly 1 through the first heat dissipation port 11 and is discharged from the second heat dissipation port 14. The larger area of the first heat dissipation port 11 is conducive to drawing in more cold air, so that the cold air can fully contact the battery cell assembly 2.

[0046] In one embodiment, the housing assembly 1 further has a third heat dissipation vent 15, which is located on any side of the housing assembly 1 other than the surfaces where the first heat dissipation vent 11 and the second heat dissipation vent 14 are located. The third heat dissipation vent 15 is used to allow airflow from this side into the battery pack. The airflow passing through the third heat dissipation vent 15 and the airflow passing through the first heat dissipation vent 11 converge into a single airflow and exits through the second heat dissipation vent 14. By adding the third heat dissipation vent 15, airflow from different directions can enter the battery pack, which can more evenly distribute the heat of the cell assembly 2 and avoid local overheating. The convergence of airflow inside can more comprehensively and efficiently cover the surface of the cell, maintain the overall thermal balance, and further improve the heat dissipation capacity of the battery pack. This not only increases the airflow and improves the efficiency of internal heat exchange, but also ensures that even if a heat dissipation vent is partially blocked by external factors, the battery pack can still dissipate heat through other inlets, ensuring the reliability of the heat dissipation system. This multi-inlet single-outlet heat dissipation method helps to reduce the surface temperature of the cell more quickly.

[0047] In one embodiment, the housing assembly 1 further has a third heat dissipation vent 15, which is located on any two opposite sides of the housing assembly 1 other than the surfaces where the first heat dissipation vent 11 and the second heat dissipation vent 14 are located. The third heat dissipation vent 15 is used to allow airflow from the opposite sides into the battery pack. The airflow passing through the third heat dissipation vent 15 and the airflow passing through the first heat dissipation vent 11 form a single airflow that exits from the second heat dissipation vent 14. By adding the third heat dissipation vent 15, airflow from different directions can enter the battery pack, which can more evenly distribute the heat of the cell assembly 2 and avoid local overheating. The convergence of airflow inside can more comprehensively and efficiently cover the surface of the cell, maintain the overall thermal balance, and further improve the heat dissipation capacity of the battery pack. This not only increases the airflow and improves the efficiency of internal heat exchange, but also ensures that even if a heat dissipation vent is partially blocked by external factors, the battery pack can still dissipate heat through other inlets, ensuring the reliability of the heat dissipation system. This multi-inlet single-outlet heat dissipation method helps to reduce the surface temperature of the cell more quickly.

[0048] In one embodiment, the total area of ​​the third heat dissipation vent 15 is less than or equal to the total area of ​​the second heat dissipation vent 14, thus solving the problem of localized overheating caused by a single airflow direction. Lateral or other airflow directions can flow in sufficiently, ensuring uniform heat dissipation across all parts of the battery cell and preventing performance loss or risks due to localized high temperatures. The refined heat dissipation vent layout allows for better control of temperature gradients in different areas of the device. The multi-inlet, single-outlet layout ensures that even if one heat dissipation vent fails due to external obstruction or other issues, the remaining vents can still guarantee sufficient airflow and heat dissipation, thereby ensuring the continuity and reliability of the system.

[0049] In an embodiment, the total area of the third heat dissipation port 15 is greater than the total area of the second heat dissipation port 14, solving the problem of local overheating caused by a single air flow direction. The air flow in the transverse or other direction can flow in sufficiently to ensure that each part of the battery cell is evenly cooled, preventing performance loss or risk caused by local high temperature. The fine layout of the heat dissipation ports can better control the temperature gradient in different areas of the device, and the multi-inlet single-outlet layout ensures that when one heat dissipation port fails due to being blocked externally or other problems, the remaining heat dissipation ports can still ensure sufficient air flow and heat dissipation effect, thereby ensuring the continuity and reliability of the system.

[0050] In an embodiment, the second heat dissipation port 14 is arranged in the middle area of the side of the shell assembly 1 having the opening 13 and opposite the first heat dissipation port 11, so that the air flow can more evenly cover the surface of the battery cell assembly 2, and the air flow distribution spreading from the center to the periphery reduces the problem of local heat concentration, helping to maintain the temperature uniformity inside the battery pack.

[0051] In an embodiment, the second heat dissipation port 14 is arranged in the middle area of the side of the shell assembly 1 having the opening 13 and opposite the first heat dissipation port 11, and is adjacent to the opening 13, so that the air flow can more evenly cover the surface of the battery cell assembly 2, and the air flow distribution spreading from the center to the periphery reduces the problem of local heat concentration, helping to maintain the temperature uniformity inside the battery pack.

[0052] In an embodiment, the shell assembly 1 has a locking position 16, and the shell assembly 1 is used for tool locking of the battery pack to avoid movement of the battery pack. The second heat dissipation port 14 is arranged in the middle area of the side of the shell assembly 1 having the opening 13 and opposite the first heat dissipation port 11, and between the second heat dissipation port 14 and the locking position 16, so that the air flow can more evenly cover the surface of the battery cell assembly 2, and the air flow distribution spreading from the center to the periphery reduces the problem of local heat concentration, helping to maintain the temperature uniformity inside the battery pack.

[0053] In an embodiment, the shell assembly 1 is combined in a two-piece form, the shell assembly 1 is arranged as a concave shell with an opening on the top surface or any one surface, and the end cover is connected to the shell from the opening side; the shell assembly 1 is combined in a three-piece form, the shell assembly 1 is arranged as a through integrally formed shell with openings on opposite sides, and the end cover is connected to the shell from the opening; the shell assembly 1 is combined in a four-piece form, the shell assembly 1 is arranged as a through split shell with openings on opposite sides, the shell can be buckled up and down, and the end cover is connected to the shell from the opening. The assembly form of the shell assembly 1 is not specifically limited.

[0054] In an embodiment, the shell assembly 1 further includes a water drainage port 113 arranged on at least one surface other than the surface of the battery pack having the opening 13, for draining water entering the shell assembly 1.

[0055] Referring to Figure 4 , the battery cell assembly 2 comprises a unit battery cell 21, a battery cell support 22, a waterproof layer 23, and a waterproof member 24.

[0056] The unit battery cell 21 is a cylindrical battery cell, having a first battery cell end face 211 and a second battery cell end face 212.

[0057] Referring to Figure 5 , in an embodiment, the first battery cell end face 211 has a positive electrode end face 2111, and the positive electrode end face 2111 is a planar end face.

[0058] Referring to Figure 5 , in an embodiment, the first battery cell end face 211 has a positive electrode end face 2111, and the positive electrode end face 2111 has a cap end face 21111 protruding outwardly in the positive electrode end face 2111.

[0059] Referring to Figure 5 , Figure 9 , in an embodiment, the first battery cell end face 211 has a positive electrode end face 2111 and a negative electrode end face 2112, and the negative electrode end face 2112 and the positive electrode end face 2111 are separated by a separation member 2113 for isolating the positive electrode and the negative electrode from contacting each other to avoid short circuit. In the first battery cell end face 211, the edge of the negative electrode end face 2112 close to the central axis of the unit battery cell 21 is a first edge, and the exposed hole 222 exposes the first edge. The projection distance c between the first edge and the edge inside the exposed hole 222 is greater than or equal to 0.1 mm. The exposed hole 222 has a spacing with the first edge, which not only enhances the insulation and isolation in structure, but also allows the waterproof layer 23 to cover the negative electrode end face 2112 and the separation member 2113. Once the separation member 2113 is damaged or fails due to aging, the waterproof layer 23 becomes an additional barrier to prevent water vapor from entering the inside of the battery cell. At the same time, the waterproof layer 23 covers the negative electrode end face 2112 and the exposed hole 222, so that the water vapor cannot penetrate into the battery cell along the length direction of the battery cell from the assembly gap of the containing groove 221, and the positive electrode end face and the negative electrode end face 2112 are in contact, thereby avoiding potential short circuit.

[0060] Referring to Figure 4, the cell support 22 has a receiving groove 221, an exposed hole 222, a first end 223, and a second end 224. The first end 223 of the cell support 22 has the receiving groove 221 for accommodating the unit cell 21. One end of the receiving groove 221 has a notch for the unit cell 21 to extend into. The other end of the receiving groove 221 has the exposed hole 222 that penetrates through the cell support 22. The area of the exposed hole 222 is smaller than the cross-sectional area of the receiving groove 221 parallel to the exposed hole 222. The area of the exposed hole 222 is smaller than the maximum area of the first cell end face 211 extending into the receiving groove 221. The shape of the exposed hole 222 includes but is not limited to a circular shape, an oval shape, a square shape, etc. The cell support 22 is fixed on the support fixing seat in the housing assembly 1 by means of welding or screw connection, so as to provide additional structural support and shock protection.

[0061] Please refer to Figure 10 In an embodiment, the cell support 22 has a limiting portion 225 matched with the support fixing seat. The limiting portion 225 has a locking member (not shown in the figure). The locking member (not shown in the figure) includes but is not limited to a threaded hole. The threaded hole is fastened by a screw or is a first mortise-tenon structure matched with a second mortise-tenon structure on the housing assembly 1. The limiting portion 225 is welded on the housing assembly 1 or is locked by a gluing process. In this way, the cell support 22 cannot move in the housing assembly 1.

[0062] Please refer to Figure 9 In an embodiment, the height d of the exposed hole 222 is greater than or equal to 0.5 mm and less than or equal to 2.5 mm. The height d of the exposed hole 222 is greater than or equal to 0.5 mm, so as to effectively support the unit cell 21 and prevent the unit cell 21 from being deviated due to vibration or other external forces during normal use, thereby improving the mechanical stability and safety of the battery pack. The height d of the exposed hole 222 is less than or equal to 2.5 mm, so as to avoid unnecessary use of materials while strengthening the support strength, thereby optimizing the weight of the battery pack and further improving the energy efficiency and endurance performance. The height range of the exposed hole 222 takes into account the utilization rate of the internal space of the cell. On the basis of ensuring the support strength, the reasonable height of the exposed hole 222 avoids unnecessary occupation of the effective space of the battery pack, so that the battery pack can maximize the capacity and energy density in a limited space.

[0063] The waterproof layer 23 is arranged at the second end 224 of the cell support 22 by any one of the gluing and vacuum coating processes. The waterproof layer 23 covers the first cell end face 211 and the second cell end face 212 of the unit cell 21, so as to avoid the short circuit caused by the contact between the first cell end face 211 and the second cell end face 212 and the water vapor in the external environment.

[0064] Please refer toFigures 6-10 The waterproof member 24 is arranged at the second end 224 of the cell holder 22, and has a first end face 241 away from the cell holder 22 and a second end face 242 close to the cell holder 12. The second end face 242 is provided with an at least partially waterproof layer. By adding the waterproof member 24, the waterproof layer 23 can cover the cell holder 22 without waiting for the waterproof layer to dry before subsequent assembly, greatly improving the efficiency of the production line, reducing waiting time, and improving production flexibility and response speed.

[0065] Please refer to Figure 9 In an embodiment, the first end face 241 has a first convex surface 2411 protruding towards the end face of the unit cell 21 at the exposed hole 222, and the second end face 242 is a flat surface. The waterproof member 24 has the first convex surface 2411 at the position of the exposed hole 222, and the waterproof member 24 is formed at the weak area of the exposed hole 222. In the case of abnormal overheating of the cell, there is usually a high-pressure and high-temperature fire situation in the area of the first cell end face 211. At this time, the abnormal unit cell 21 can quickly break through the waterproof plate at the weak area, thereby providing a safe pressure relief mechanism and avoiding affecting adjacent unit cells 21 or adjacent cell assemblies 2, and preventing continuous deflagration.

[0066] Please refer to Figure 9 In an embodiment, the first end face 241 has a first convex surface 2411 protruding towards the end face of the unit cell 21 at the exposed hole 222, and the second end face 242 is a flat surface. The distance b between the first convex surface 2411 and the second end face 242 is greater than 0.3 mm and less than or equal to 3 mm. By setting the distance b between the first convex surface 2411 and the second end face 242 within a certain range, the thickness of the weak area can be controlled to be more easily broken, while effectively preventing the waterproof layer from being broken due to improper operation during the pressing process. This ensures that a clear and controlled safety pressure relief channel is provided for abnormal conditions such as high pressure and high temperature while providing waterproof protection. Furthermore, by defining the range of b, the thickness of the weak area can be controlled and consistent during manufacturing, which not only ensures quality control in mass production, but also improves the stability of the production process.

[0067] In an embodiment, the second end surface 242 is non-planar, and the second end surface 242 has a second convex surface 2421 protruding towards the end surface of the unit cell 21 at the exposed hole 222, the distance a-2 between the second convex surface 2421 and the positive electrode end surface 2111 is greater than or equal to 0.1 mm, or the distance a-1 between the second convex surface 2421 and the cap end surface 21111 is greater than or equal to 0.1 mm. By specifying the range of a-1 and a-2, the thickness of the weak area waterproof layer can be controlled as much as possible under effective waterproof protection, providing a clear and controlled safety pressure relief channel for abnormal conditions such as high pressure and high temperature. Furthermore, by specifying the range of a-1 and a-2, the controllability and consistency of the thickness of the weak area can be maintained during the manufacturing process, which not only ensures quality control in mass production, but also improves the stability of the production process.

[0068] In an embodiment, the second end surface 242 is non-planar, and the second end surface 242 has a second convex surface 2421 protruding towards the end surface of the unit cell 21 at the exposed hole 222, the distance a-2 between the second convex surface 2421 and the positive electrode end surface 2111 is greater than or equal to 0.1 mm, or the distance a-1 between the second convex surface 2421 and the cap end surface 21111 is greater than or equal to 0.1 mm. By specifying the range of a-1 and a-2, the thickness of the weak area waterproof layer can be controlled as much as possible under effective waterproof protection, providing a clear and controlled safety pressure relief channel for abnormal conditions such as high pressure and high temperature. Furthermore, by specifying the range of a-1 and a-2, the controllability and consistency of the thickness of the weak area can be maintained during the manufacturing process, which not only ensures quality control in mass production, but also improves the stability of the production process.

[0069] In an embodiment, the second end surface 242 is non-planar, and the second end surface 242 has a second convex surface 2421 protruding towards the end surface of the unit cell 21 at the exposed hole 222, the distance a-2 between the second convex surface 2421 and the positive electrode end surface 2111 is greater than or equal to 0.1 mm, or the distance a-1 between the second convex surface 2421 and the cap end surface 21111 is greater than or equal to 0.1 mm. By specifying the range of a-1 and a-2, the thickness of the weak area waterproof layer can be controlled as much as possible under effective waterproof protection, providing a clear and controlled safety pressure relief channel for abnormal conditions such as high pressure and high temperature. Furthermore, by specifying the range of a-1 and a-2, the controllability and consistency of the thickness of the weak area can be maintained during the manufacturing process, which not only ensures quality control in mass production, but also improves the stability of the production process.

[0070] In an embodiment, the second end face 242 has a second convex surface 2421 protruding towards the end face of the unit cell 11 at the exposed hole 222, the distance a-2 between the second convex surface 2421 and the positive electrode end face 2111 is greater than or equal to 0.3 mm and less than or equal to 0.8 mm, or the distance a-1 between the second convex surface 2421 and the cap end face 21111 is greater than or equal to 0.3 mm and less than or equal to 1.2 mm. By specifying the range of a-1 and a-2, the thickness of the weak area waterproof layer can be controlled as much as possible under effective waterproof protection, providing a clear and controlled safety pressure relief channel for abnormal conditions such as high pressure and high temperature. Furthermore, by specifying the range of a-1 and a-2, the thickness of the weak area can be kept controllable and consistent during the manufacturing process, which not only ensures quality control in mass production, but also improves the stability of the production process.

[0071] Please refer to Figure 17 In an embodiment, the waterproof member 24 is a non-metallic material with a heat softening temperature greater than or equal to 90°, such as ABS\PC\PP\PE\Nylon\PA\GF. Figure 17 As shown, the 60V unit cell 21 has a temperature rise of about 60° during the 30A discharge process. The higher the current intensity, the higher the temperature rise of the cell end face. In order to protect the unit cell 21 during the charging and discharging process, the cell usually has a high pressure and high temperature fire situation in the first cell end face 211 area in the case of abnormal overtemperature. At this time, the temperature of the cell end face is usually above 100°. By setting the waterproof member 24 to a non-metallic material with a heat softening temperature greater than or equal to 90°, the waterproof member 24 can soften itself during the abnormal temperature rise of the unit cell 21. At this time, the abnormal unit cell 21 can break through the weak area waterproof member more quickly, thereby providing a safe pressure release mechanism to avoid affecting the adjacent unit cell 21 or the adjacent cell assembly 2 from continuous detonation. At the same time, during the normal temperature rise of the unit cell 21, it can not be affected by the temperature rise, thereby providing stable and effective waterproof effect.

[0072] In an embodiment, the waterproof member 24 is ABS\PC\PP\PE\Nylon\PA\GF. By setting the waterproof member 24 to ABS\PC\PP\PE\Nylon\PA\GF, the waterproof member 24 can soften itself during the abnormal temperature rise of the unit cell 21. At this time, the abnormal unit cell 21 can break through the weak area waterproof member more quickly, thereby providing a safe pressure release mechanism to avoid affecting the adjacent unit cell 21 or the adjacent cell assembly 2 from continuous detonation. At the same time, during the normal temperature rise of the unit cell 21, it can not be affected by the temperature rise, thereby providing stable and effective waterproof effect.

[0073] In an embodiment, the waterproof member 24 is a waterproof plate with the same thickness, the thickness is greater than or equal to 0.3 mm and less than or equal to 3 mm, the waterproof member 24 has a first convex surface 2411 and a second convex surface 2421 protruding towards the end surface of the unit cell 21 at the exposed hole 222, the first convex surface 2411 and the second convex surface are formed in the weak area of the exposed hole 222, the unit cell 21 has high pressure and high temperature fire spray in the abnormal situation of over-temperature, usually in the area of the first cell end surface 211, at this time, the abnormal unit cell 21 can quickly break through the waterproof plate in the weak area, thereby providing a safe pressure release mechanism, avoiding affecting the adjacent unit cell 21 or adjacent cell assembly 2, and appearing continuous deflagration.

[0074] In an embodiment, the waterproof member 24 is a waterproof plate with uneven thickness, the thickness of the waterproof member 24 at the exposed hole 222 is less than the thickness of the waterproof member 24 outside the exposed hole 222, the waterproof member 24 is formed in the weak area of the exposed hole 222, the unit cell 21 has high pressure and high temperature fire spray in the abnormal situation of over-temperature, usually in the area of the first cell end surface 211, at this time, the abnormal unit cell 21 can quickly break through the waterproof plate in the weak area, thereby providing a safe pressure release mechanism, avoiding affecting the adjacent unit cell 21 or adjacent cell assembly 2, and appearing continuous deflagration.

[0075] Please refer to Figure 4 In an embodiment, the waterproof member 24 has a positioning member 226, the positioning member 226 is a positioning hole, the positioning column is arranged on the cell support 22, and the size of the positioning column is 1 mm-10 mm, so that effective positioning can be achieved.

[0076] In an embodiment, the waterproof member 24 has a positioning member 226, the positioning member 226 is a positioning column, the size of the positioning column is 0.5 mm-2 mm, and the positioning hole is arranged on the cell support 22, and part or all of the positioning column can be accommodated in the positioning hole.

[0077] In an embodiment, the waterproof member 24 is limited and matched with the cell support 22, and the embodiment includes but is not limited to a dovetail form of buckling structure connection, welding, pasting and other process connection forms.

[0078] Please refer to Figures 10-12, the output pole piece seat 3 has a terminal assembly 32, a terminal fixing seat 33, the terminal fixing seat 33 has a guide slot 331, a fixed end 332 and a waterproof space 333, the guide slot 331 is used to guide the correct insertion direction of the tool pole piece, so as to avoid installation errors that cause short circuit, and at the same time, the tool pole piece can be stabilized, and effective connection with the control device 4 is ensured;The fixed end 332 is used for fixed connection with the control device 4, the waterproof space 333 includes a first waterproof space 3331 and a second waterproof space 3332, the first waterproof space 3331 is the assembly gap between the terminal fixing seat 33 and the terminal assembly 32 when the terminal fixing seat 33 limits the terminal assembly 32, the second waterproof space 3332 is the assembly gap between the terminal fixing seat 33 and the control device 4, the second waterproof space 3332 has at least one inlet 33321, the inlet 33321 is located between the terminal fixing seat 33 and the control device 4, and the position of the inlet 33321 is designed to facilitate the rapid and uniform infiltration and filling of the second waterproof space 3332 during operation of the waterproof material, so that efficient waterproof effect is realized during installation and maintenance, the safe operation of the control device is maintained for a long time, the second waterproof space 3332 is fully filled, and a basic waterproof barrier is provided for the terminal assembly 32, so that the internal structure is protected from moisture and pollutants, and the control panel is prevented from malfunctioning.

[0079] In an embodiment, the fixed end 332 has a columnar shape with a height greater than or equal to 0.5 mm and less than or equal to 3 mm, the first end of the fixed end 332 is connected to the terminal fixing seat 33, and the second end is connected to the control device 4, the fixed end 332 supports the terminal fixing seat 33, so that the terminal fixing seat 33 is not in contact with the control device 4, and the second waterproof space 3332 is the projection area of the terminal fixing seat 33 on the control device 4, and the non-contact space of the terminal fixing seat 33 between the control devices 4.

[0080] In an embodiment, the terminal fixing seat 33 has a fixed end 332 in a convex shape on the side close to the control device 4, the fixed end 332 is connected to the control device 4, the fixed end 332 supports the terminal fixing seat 33, so that the terminal fixing seat 33 is not in contact with the control device 4, and the second waterproof space 3332 is the projection area of the terminal fixing seat 33 on the control device 4, and the non-contact space of the terminal fixing seat 33 between the control devices 4.

[0081] In an embodiment, the waterproof material of the first waterproof space 3331 and the second waterproof space 3332 is formed by vacuum plating and is encapsulated at one time, at this time, the height distance of the inlet 33321 is greater than or equal to 0.5 mm, and / or the lowest height distance of the second waterproof space 3332 is greater than or equal to 0.5 mm, through the distance greater than or equal to 0.5 mm, in the vacuum plating process and the compression of the overall size of the battery pack, the waterproof material can be better filled in the second waterproof space 3332, avoiding the situation that the center area in the second waterproof space 3332 is not filled and the waterproof material in the second waterproof space 3332 is unevenly distributed.

[0082] In an embodiment, the waterproof material of the first waterproof space 3331 and the second waterproof space 3332 is formed by vacuum plating and is encapsulated at one time, at this time, the height distance of the inlet 33321 is greater than or equal to 0.5 mm, and / or the lowest height distance of the second waterproof space 3332 is greater than or equal to 0.5 mm, through the distance greater than or equal to 0.5 mm, in the vacuum plating process and the compression of the overall size of the battery pack, the waterproof material can be better filled in the second waterproof space 3332, avoiding the situation that the center area in the second waterproof space 3332 is not filled and the waterproof material in the second waterproof space 3332 is unevenly distributed.

[0083] In an embodiment, the waterproof material of the first waterproof space 3331 and the second waterproof space 3332 is formed by vacuum plating and is encapsulated at one time, at this time, the height distance of the inlet 33321 is greater than or equal to 0.5 mm, and / or the lowest height distance of the second waterproof space 3332 is greater than or equal to 0.5 mm, through the distance greater than or equal to 0.5 mm, in the vacuum plating process and the compression of the overall size of the battery pack, the waterproof material can be better filled in the second waterproof space 3332, avoiding the situation that the center area in the second waterproof space 3332 is not filled and the waterproof material in the second waterproof space 3332 is unevenly distributed.

[0084] The control device 4 is arranged on the cell support 22, and the control device 4 has a control board 41 and a connecting piece 42. The control board 41 has at least a control module and a communication module. The control board 41 is connected to the unit cell 21 through the connecting piece 42 from the exposed hole 222 to at least realize the communication and control functions. The control module is used to adjust the voltage, current and temperature parameters in the battery pack to ensure the safe and efficient operation of the whole system. The communication module is used to exchange data with external devices to realize the monitoring of the working state of the battery pack.

[0085] Please refer to Figures 14-16The connector 42 includes a single-cell detection component 421 and a connecting electrode 422. The single-cell detection component 421 has a first connecting end 4211 and a second connecting end 4212. The first connecting end 4211 is connected to the connecting electrode 422, and the connecting electrode 422 is connected to the unit cell 21 through the exposed hole 222. The second connecting end 4212 is connected to the control board 41 through a welding process. This avoids the situation where messy power lines are connected to the control board through the terminals, resulting in poor terminal waterproofing and inconvenience for maintenance inside the battery pack. Compared with traditional methods, this is a more efficient and convenient solution. The loose architecture of tool-type battery packs, consisting of "discrete wiring harnesses + plug-in terminals," leads to redundant detection channels and waterproof design defects in the plug-in terminals. This application addresses these issues by replacing the discrete wiring harnesses with plate-shaped / sheet-shaped single-cell detection components. Through a multi-pole integrated layout, the detection paths of N unit cells are integrated onto a single connector, achieving a comprehensive upgrade in the tool battery pack in terms of space utilization, dynamic reliability, signal accuracy, and environmental tolerance. It is particularly suitable for industrial-grade power tool scenarios with high vibration and high humidity conditions.

[0086] In one embodiment, the second connection terminal 4212 has a first pad 42121 corresponding to at least the number of cell 21 units, and the control board 41 has a second pad 411 corresponding to at least the number of first pads 42121 on the second connection terminal 4212. The area of ​​the first pad 42121 is less than or equal to that of the second pad 411. By making the area of ​​the first pad 42121 less than or equal to that of the second pad 411, the smaller area of ​​the first pad 42121 allows it to be fully attached to the larger second pad 411, reducing the possible short circuit risk between adjacent pads, thereby improving the safety and reliability of the circuit, providing good thermal conductivity and electrical connection. At the same time, the smaller pad acts on the larger pad during thermal expansion, which can reduce the mechanical stress caused by thermal expansion and contraction, thereby reducing fatigue of the solder joint and potential solder cracking problems. This configuration can increase the mechanical strength of the solder and improve the stability and durability of the connection.

[0087] In one embodiment, the second connection terminal 4212 has at least a number of first pads 42121 corresponding to the number of unit cells 21. Each first pad 42121 is directly connected to the second connection terminal 4212 of the single cell detection component 421 through a soldering process, forming an independent electrical channel, which can eliminate the common ground interference of traditional wire harnesses. The control board 41 has at least a number of second pads 411 corresponding to the number of first pads 42121 of the second connection terminal 4212. By precisely matching the number of second pads 411 on the control board with the number of first pads on the connector, the loose architecture of "discrete wire harness + plug-in terminal" is upgraded to an integrated "pad matrix - rigid interconnection". The paradigm completely solves the problems of electrical failure and mechanical fatigue of tool-type battery packs under high vibration and high humidity conditions. The first pad 42121 has at least one through hole 42122 that penetrates the first pad 42121. The ratio of the diameter of the through hole 42122 to the width of the first pad 42121 is less than or equal to 1:2. By setting the ratio of the diameter of the through hole 42122 to the width of the first pad 42121 to less than or equal to 1:2, the penetration ability of the solder during the welding process is enhanced, the mechanical strength and the firmness of the conductive connection are improved, and the through hole allows the solder to fill better, forming a more robust connection with better conductivity.

[0088] In one embodiment, the second connection terminal 4212 has at least a first pad 42121 corresponding to the number of cell 21, and the control board 41 has at least a second pad 411 corresponding to the number of first pads 42121 of the second connection terminal 4212. In the first pad 42121 and / or the second pad 411, the minimum spacing e between adjacent pads is greater than or equal to 0.2 mm and less than or equal to 2 mm. By having the minimum spacing e between adjacent pads greater than or equal to 0.2 mm and less than or equal to 2 mm, the risk of short circuits caused by solder bridging or conductive particle contamination can be effectively reduced. At the same time, it can also reduce welding defects caused by deviations in the manufacturing process. During manufacturing and operation, the increased spacing provides greater error tolerance for welding and subsequent operations, enhances the safety and reliability of the overall circuit, prevents crosstalk between signals, improves signal integrity and transmission efficiency, and each pad area can effectively dissipate heat, avoiding local overheating problems caused by excessive concentration. The increased pad spacing allows for better heat dissipation and management.

[0089] In an embodiment, the second connecting end 4212 has at least a first pad 42121 corresponding to the number of unit cells 21, the control board 41 has at least a second pad 411 corresponding to the number of first pads 42121 of the second connecting end 4212, and the distance f between the peripheral components and the adjacent first pad 42121 welding area and / or the second pad 411 is greater than or equal to 1 mm and less than or equal to 25 mm. By setting f to be greater than or equal to 1 mm and less than or equal to 25 mm, the distance between the pad and the peripheral components can be increased, which helps to reduce the mutual influence of electromagnetic interference. This physical isolation can reduce signal coupling on the circuit board, improve signal integrity, ensure more stable electrical performance, and at the same time, a larger distance between components and pads reduces the risk of short circuit caused by accidental contact or material bridging (such as solder overflow), providing greater safety margin for production and subsequent equipment operation. Furthermore, the increased spacing improves the heat dissipation capacity of the circuit board, allowing heat to be more effectively conducted away from high-heat areas, preventing local overheating and heat accumulation problems.

[0090] In an embodiment, the first pad 42121 and / or the second pad 411 pad tin plating thickness is 0.05-0.15 mm. By controlling the tin plating thickness to be 0.05-0.15 mm, the excessive flow of solder during welding can be reduced, the risk of forming a solder bridge and short circuit can be reduced, and the electrical isolation effect of the welding area can be improved.

[0091] In an embodiment, the single-cell detection member is connected to the cell holder in a manner including but not limited to adhesion, clamping, and the like.

[0092] An embodiment of the present application will be described in more detail below with reference to the accompanying drawings:

[0093] A tool battery pack has a housing assembly 1, a cell assembly 2, an output tab seat 3, and a control device 4. The housing assembly 1 is used to accommodate the cell assembly 2, the output tab seat 3, and the control device 4. The control device 4 is connected to the output tab seat 3 and the cell assembly 2.

[0094] The housing assembly 1 has a holder fixing seat (not shown) and an opening 13 for accommodating the cell assembly, the output tab seat, and the control device. The opening 13 is provided on the housing assembly 1 corresponding to the output tab seat 3, for the tool tab to pass through and connect with the output tab seat 3. The holder fixing seat (not shown) is provided on at least one side of the housing assembly 1 to fix the cell assembly 2.

[0095] The electric cell assembly 2 comprises at least one cylindrical unit cell 21, an electric cell support 22 fixedly connected to the support fixing seat in the shell assembly 1 by welding or screwing, etc. to provide additional structural support and shock protection, the electric cell support 22 has a containing groove 221 for accommodating the unit cell 21, the first end 2211 of the containing groove 221 has a notch for the unit cell 21 to extend into, the second end 2212 of the containing groove 221 has an exposed hole 222 penetrating through the electric cell support 22, the area of the exposed hole 222 is smaller than the cross-sectional area of the containing groove 221 parallel to the exposed hole 222, and the area of the exposed hole 222 is smaller than the maximum area of the first cell end face 211 extending into the containing groove 221.

[0096] The output tab seat 3 has a terminal assembly 32 and a terminal fixing seat 33, the terminal assembly 32 is arranged in the terminal fixing seat 33, the terminal fixing seat 33 limits the terminal assembly 32, the terminal fixing seat 33 is fixedly connected to the control board, the terminal assembly 32 is connected to the control device 4, the terminal fixing seat 33 has a guide groove 331 for guiding the tool tab to be inserted in the correct direction to avoid short circuit caused by installation error, and the tool tab can be stably fixed to ensure effective connection with the control device 4.

[0097] The control device 4 is arranged on the electric cell support 22, the control device 4 has a control board 41 and a connecting piece 42, the control board 41 has at least a control module and a communication module, the control board 41 is connected to the unit cell 21 through the connecting piece 42 from the exposed hole 222 to at least realize communication and control functions, the control module is used for adjusting voltage, current and temperature parameters in the battery pack to ensure safe and efficient operation of the whole system, and the communication module is used for data exchange with external devices to realize monitoring of the working state of the battery pack.

[0098] The control device 4 is arranged on the electric cell support 22, the control device 4 has a control board 41 and a connecting piece 42, the control board 41 has at least a control module and a communication module, the control board 41 is connected to the unit cell 21 through the connecting piece 42 from the exposed hole 222 to at least realize communication and control functions, the control module is used for adjusting voltage, current and temperature parameters in the battery pack to ensure safe and efficient operation of the whole system, and the communication module is used for data exchange with external devices to realize monitoring of the working state of the battery pack.

[0099] Please refer to Figures 14-16The connecting piece 42 has a single-section battery cell detection piece 421 and a connecting tab 422. The single-section battery cell detection piece 421 has a first connecting end 4211 and a second connecting end 4212. The first connecting end 4211 is connected to the connecting tab 422. The connecting tab 422 is connected to the unit battery cell 21 from the exposed hole 222. The second connecting end 4212 is connected to the control panel 41 through a welding process. This avoids the poor waterproof performance of the terminal caused by the messy power line connected to the control panel, the inconvenience of maintaining the battery pack, and the problems of redundant detection channels and waterproof design defects of the plug-in terminal of the traditional tool battery pack. Compared with the loose architecture of the traditional tool battery pack, the application replaces the discrete wire harness with a plate-shaped / single-section battery cell detection piece 421. Through the multi-tab integrated layout, the detection paths of N unit battery cells are integrated on a single connecting piece. This realizes the overall upgrade of the tool battery pack in terms of space utilization, dynamic reliability, signal accuracy, and environmental tolerance. It is especially suitable for industrial-grade electric tool scenes in high-vibration and high-humidity working conditions.

[0100] In one embodiment, the second connecting end 4212 has at least a first pad 42121 corresponding to the number of unit battery cells 21. Each first pad 42121 is directly connected to the second connecting end 4212 of the single-section battery cell detection piece through a welding process, forming an independent electrical channel that can eliminate the common ground interference of traditional wire harnesses. The control panel 41 has at least a second pad 411 corresponding to the number of first pads 42121 of the second connecting end 4212. By precisely matching the number of second pads 411 of the control panel and first pads 42121 of the connecting piece, the loose architecture of “discrete wire harness + plug-in terminal” is upgraded to the integrated paradigm of “pad matrix-rigid interconnection”. This completely solves the electrical failure and mechanical fatigue problems of tool battery packs in high-vibration and high-humidity working conditions. The area of the first pad 42121 is less than or equal to the area of the second pad 411. By making the area of the first pad 42121 less than or equal to the area of the second pad 411, the smaller area of the first pad 42121 allows it to completely adhere to the larger second pad 411, reducing the risk of short circuit between adjacent pads and improving the safety and reliability of the circuit. This provides good heat conduction and electrical connection. Meanwhile, the smaller pad exerts force on the larger pad during thermal expansion, which can reduce mechanical stress caused by thermal expansion and contraction, thereby reducing the fatigue and potential cracking of the welding points. This configuration can increase the mechanical strength of the welding and improve the stability and durability of the connection.

[0101] In an embodiment, the second connecting end 4212 has at least a first pad 42121 corresponding to the number of unit cells 21, and the control board 41 has at least a second pad 411 corresponding to the number of first pads 42121 of the second connecting end 4212, and the first pad 42121 has at least one through hole 42122 penetrating the first pad 42121, and the aperture ratio of the through hole 42122 to the pad width of the first pad 42121 is less than or equal to 1:2. By setting the aperture ratio of the through hole 42122 to the pad width of the first pad 42121 to be less than or equal to 1:2, the penetration ability of the solder during welding is enhanced, the mechanical strength and the firmness of the conductive connection are improved, the through hole enables the solder to be better filled, and a more solid and better conductive connection is formed.

[0102] In an embodiment, the second connecting end 4212 has at least a first pad 42121 corresponding to the number of unit cells 21, and the control board 41 has at least a second pad 411 corresponding to the number of first pads 42121 of the second connecting end 4212, and the first pad 42121 and / or the second pad 411 has a minimum spacing e between adjacent pads greater than or equal to 0.2mm and less than or equal to 2mm. By setting the minimum spacing e between adjacent pads to be greater than or equal to 0.2mm and less than or equal to 2mm, the risk of short circuit caused by solder bridging or conductive particle contamination can be effectively reduced, and at the same time, the welding defects caused by manufacturing process deviation can also be reduced. In the manufacturing and operation process, the increased spacing provides greater error tolerance for welding and subsequent operations, enhances the safety and reliability of the overall circuit, prevents cross-talk problems between signals, improves the integrity and transmission efficiency of signals, and each pad area can effectively dissipate heat to avoid local overheating problems caused by excessive concentration. The increase in pad spacing allows better heat dissipation and management.

[0103] In an embodiment, the second connecting end 4212 has at least a first pad 42121 corresponding to the number of unit cells 21, the control board 41 has at least a second pad 411 corresponding to the number of first pads 42121 of the second connecting end 4212, and the distance f between the peripheral components and the adjacent first pad 42121 welding area and / or the second pad 411 is greater than or equal to 1 mm and less than or equal to 25 mm. By setting f to be greater than or equal to 1 mm and less than or equal to 25 mm, the distance between the pad and the peripheral components can be increased, which helps to reduce the mutual influence of electromagnetic interference. This physical isolation can reduce signal coupling on the circuit board, improve signal integrity, ensure more stable electrical performance, and at the same time, a larger distance between components and pads reduces the risk of short circuit caused by accidental contact or material bridging (such as solder overflow), providing greater safety margin for production and subsequent equipment operation. Furthermore, the increased spacing improves the heat dissipation capacity of the circuit board, allowing heat to be more effectively conducted away from high-heat areas, preventing local overheating and heat accumulation problems.

[0104] In an embodiment, the first pad 42121 and / or the second pad 411 pad tin plating thickness is 0.05-0.15 mm. By controlling the tin plating thickness to be 0.05-0.15 mm, the excessive flow of solder during welding can be reduced, the risk of forming a solder bridge and short circuit can be reduced, and the electrical isolation effect of the welding area can be improved.

[0105] In an embodiment, the first pad 42121 and / or the second pad 411 pad tin plating thickness is 0.05-0.1 mm

[0106] In an embodiment, the single-cell detection member is connected to the cell holder in a manner including but not limited to adhesion, clamping, and the like.

[0107] Those skilled in the art can understand that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes can be made in form and detail without departing from the spirit and scope of the present application.

Claims

1. A tool battery pack comprising a housing assembly, a cell assembly, an output electrode holder, and a control device, wherein the housing assembly is used to house the cell assembly, the output electrode holder, and the control device; the control device is connected to the output electrode holder and the cell assembly; the cell assembly has multiple unit cells and a cell support, and the control device is disposed on the cell support, the control device having a control board and connectors, characterized in that: The connector has a sheet-shaped single cell detection component and a connecting electrode. One end of the connecting electrode is connected to the unit cell. The single cell detection component has a first connecting end and a second connecting end. The other end of the connecting electrode is directly connected to the first connecting end. The first connecting end integrates multiple connecting electrodes. The second connecting end is connected to the control board through a welding process.

2. The tool battery pack according to claim 1, characterized in that: The second connection terminal has a first pad that corresponds at least to the number of cell units.

3. A tool battery pack according to claim 2, characterized in that: The control board has a second pad that corresponds to at least the number of first pads on the second connection end.

4. A tool battery pack according to claim 3, characterized in that: The area of ​​the first pad is less than or equal to that of the second pad.

5. A tool battery pack according to claim 2, characterized in that: The first pad has at least one through-hole that extends through the first pad.

6. A tool battery pack according to claim 5, characterized in that: The ratio of the diameter of the through hole to the width of the first pad containing the through hole is less than or equal to 1:

2.

7. A tool battery pack according to claim 3, characterized in that: The minimum spacing e between adjacent pads is greater than or equal to 0.2 mm and less than or equal to 2 mm.

8. A tool battery pack according to claim 3, characterized in that: The distance f between the peripheral components and the adjacent first pad is greater than or equal to 1 mm and less than or equal to 25 mm.

9. A tool battery pack according to claim 3, characterized in that: The distance f between the peripheral components and the adjacent second pad is greater than or equal to 1 mm and less than or equal to 25 mm.

10. A tool battery pack according to claim 2, characterized in that: The tin plating thickness of the first pad is 0.05-0.15mm.

11. A tool battery pack according to claim 3, characterized in that: The tin plating thickness of the second pad is 0.05-0.15mm.

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