Werkzeugakkupack

Abstract

A tool battery pack comprising a housing assembly, a cell assembly, a pole piece holder, a control device, and a water-sealing layer, the housing assembly serving to house the cell assembly, the pole piece holder, and the control device; the control device being connected to the pole piece holder and the cell assembly;wherein the cell assembly comprises a cell holder and unit cells mounted on the cell holder, the cell holder having a first end and a second end, the second end having an exposed hole, the waterproofing layer being provided at the second end of the cell holder, characterized in that there is further a waterproofing member and a positioning member for connecting the waterproofing member to the cell holder, the waterproofing member being provided at a second end of the cell holder, the waterproofing member having a first end surface remote from the cell holder and a second end surface located near the cell holder, the waterproofing layer being at least partially present between the second end surface and the cell holder, the second end surface having a second convex surface at the exposed hole protruding toward the end surface of the unit cell.

Description

Cross-reference to related applications

[0001] This application claims priority from Chinese patent application No. 202520348339.4, filed with the Chinese Patent Office on February 28, 2025, and entitled “Battery Pack,” Chinese patent application No. 202520561968.5, filed with the Chinese Patent Office on March 27, 2025, and Chinese patent application No. 202520561968.5, filed with the Chinese Patent Office on April 1, 2025, and entitled “Tool Battery Pack,” the entire contents of which are incorporated into this application by reference. Technical area

[0002] The embodiment of the application relates to the field of energy supply, in particular to a tool battery pack. Background technology

[0003] In the area of ​​existing tool battery packs, a battery pack is usually composed of a single-parallel cell assembly or a double-parallel cell assembly. The unit cells in the battery pack are arranged in groups. The cell end face is usually connected to a conductive pole piece and a control board. To prevent short circuits between the unit cells, the cell end face must be covered with a waterproofing material, keeping the unit cells relatively separate from each other.The conventional waterproofing process usually involves covering the waterproofing material and allowing it to stand for a period of time before entering the subsequent assembly process. This results in the overall production efficiency being limited by the solidification time of the waterproofing material. At the same time, the power of conventional tools and the charging and discharging requirements are not high, and the probability of thermal runaway in the battery pack is very low. However, with the increase in tool power, the local temperature gradient expands due to the increase in charging and discharging speed, and the risk of thermal runaway is greatly increased. Irreversible overtemperature conditions occur in thermally runaway cells, and the temperature of the cell end face of the unit cell rises sharply.Typically, a fire occurs at the cell end face at high voltage and high temperature. If the thermally runaway cell is left unchecked, the surface temperature of the adjacent cell will be affected by the heat propagation from the thermally runaway cell, and the thermal runaway will then spread to the entire battery pack. Content of the utility model

[0004] The purpose of the embodiment of this application is to provide a tool battery pack to solve the waterproofing problem of the battery pack, speed up production, and at the same time provide rapid pressure relief for the cell from thermal runaway to avoid the secondary thermal runaway and other problems of the battery, so as to achieve a lightweight, efficient, and safe insulation solution.

[0005] A tool battery pack comprising a housing assembly, a cell assembly, a pole piece holder, a control device, and a water sealing layer, wherein the housing assembly serves to accommodate the cell assembly, the pole piece holder, and the control device; wherein the control device is connected to the pole piece holder and the cell assembly; wherein the cell assembly comprises a cell holder and unit cells mounted on the cell holder, the cell holder having a first end and a second end, the second end having an exposed hole, a water sealing layer being provided at the second end of the cell holder, further comprising a water sealing member and a positioning member for connecting the water sealing member to the cell holder, the water sealing member being provided at a second end of the cell holder, the water sealing member having a first end surface remote from the cell holder and a second end surface,which is located near the cell holder, wherein the waterproofing layer is at least partially formed between the second end face and the cell holder, wherein the second end face at the exposed hole has a second convex surface protruding toward the end face of the unit cell. Compared to the conventional waterproofing method, which usually consists of covering the waterproofing material and allowing it to stand for a period of time before entering the subsequent assembly process, resulting in the overall production efficiency being limited by the setting time of the waterproofing material; by arranging a waterproofing element with a second convex surface, this application can, on the one hand, cover the cell holder with the waterproofing layer with the addition of the waterproofing element without waiting for the waterproofing layer to dry for subsequent assembly work,This significantly improves production line efficiency, reduces waiting time, and improves production flexibility and response speed. On the other hand, the provided second convex surface ensures that the waterproofing layer is pressed by the waterproofing element, allowing the waterproofing layer to be firmly bonded to the cell end face, limiting the detachment of the waterproofing layer from the cell end face due to vibration and scratches. The thickness of the waterproofing layer on the cell end face at the exposed hole is thin, allowing the abnormal unit cell to quickly break through the waterproofing layer in the weak area, thereby providing a safe pressure relief mechanism to prevent the adjacent unit cell or cell assembly from being affected, resulting in continuous deflagration.

[0006] Optionally, the first end face has a first convex surface at the exposed hole, protruding toward the end face of the unit cell. At a minimum distance of 0.1 mm, a clear "weak interface" is formed between the water sealing layer and the cell and the area of ​​the exposed hole of the water sealing element. When the internal pressure increases, the stress is preferentially concentrated in this area, accelerating the cracking or rupture of the water sealing layer. If the cell experiences abnormal overtemperature, it will typically exhibit a high-stress and high-temperature fire in the area of ​​the first cell end face.At this time, the abnormal unit cell can quickly break through the water seal plate in the weak area, thereby providing a safe pressure relief mechanism to avoid affecting the adjacent unit cell or the adjacent cell assembly, so that continuous deflagration occurs.

[0007] Optionally, the distance B between the first convex surface and the second end surface is greater than 0.3 mm and less than or equal to 3 mm. By specifying the range of the distance B between the first convex surface and the second end surface, the thickness of the weak area can be controlled as much as possible to be more easily broken. At the same time, it effectively prevents the problem of the waterproofing layer being broken due to improper operation during the pressing process, ensuring that it simultaneously provides waterproof protection and a clear and controlled safe pressure relief channel for abnormal conditions such as high pressure and high temperature.In addition, by clarifying the range of B, the thickness of the weak point area can be maintained in the manufacturing process, which not only ensures quality control in mass production, but also can improve the stability of the production process.

[0008] Optionally, the unit cell has a first cell end face and a second cell end face, the first unit cell having a positive terminal end face, the distance A2 between the second convex surface and the positive terminal end face being greater than or equal to 0.1 mm. By specifying the range of the distance A2, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under the effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations. In addition, by clarifying the range of A2, the thickness of the weak area can be maintained in the manufacturing process, which not only ensures quality control in mass production but also can improve the stability of the production process.

[0009] Optionally, the distance A2 between the second convex surface and the positive terminal end face is greater than or equal to 0.1 mm and less than 2 mm. By specifying the distance A2 range, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under the effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations. In addition, by clarifying the distance A2 range, the thickness of the weak area can be maintained in the manufacturing process, which not only ensures quality control in mass production but also can improve the stability of the production process.Thus, excessive clearance is prevented from lengthening the path of external liquid penetration, improving the ability of the sealing layer to evenly cover the water pressure, and reducing the overall volume while maintaining a safety clearance, which is conducive to the lightweight and miniaturized design of the battery pack.

[0010] Optionally, the distance A2 between the second convex surface and the positive terminal end face is greater than or equal to 0.3 mm and less than 1.2 mm. The narrow interval design ensures that the water seal element fits more evenly against the cell end face, greatly improving long-term leakage protection performance, precisely controlling the gap, reducing temperature fluctuations or fatigue damage to the water seal layer under mechanical impact, and extending the service life. By setting the range of distance A2, the thickness of the water seal layer in the weak area can be controlled as much as possible under the effective water seal protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature and other abnormal situations.Furthermore, by clarifying the range of the A2 distance, the thickness of the weak point 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. Thus, excessive clearance prevents the path of external fluid penetration from being extended, improves the ability of the sealing layer to evenly cover water pressure, and reduces the overall volume while maintaining a safe distance, which is conducive to the lightweight and miniaturized design of the battery pack.

[0011] Optionally, the positive terminal end face has a cap end face, where the distance A1 between the second convex surface and the cap end face is greater than or equal to 0.1 mm. By specifying the range of distance A1, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under the effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations. In addition, by clarifying the range of A1, the thickness of the weak area can be maintained in the manufacturing process, which not only ensures quality control in mass production but also can improve the stability of the production process.

[0012] Optionally, the distance A1 between the second convex surface and the cap end face is greater than or equal to 0.1 mm and less than 2 mm. By specifying the range of A1, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under the effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature and other abnormal situations. In addition, by clarifying the range of the distance A1, the thickness of the weak area can be maintained in the manufacturing process, which not only ensures quality control in mass production but also can improve the stability of the production process.Thus, excessive clearance is prevented from lengthening the path of external liquid penetration, improving the ability of the sealing layer to evenly cover the water pressure, and reducing the overall volume while maintaining a safety clearance, which is conducive to the lightweight and miniaturized design of the battery pack.

[0013] Optionally, the distance A1 between the second convex surface and the cap end face is greater than or equal to 0.5 mm and less than 1.5 mm. By specifying the distance A1 range, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under the effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations. In addition, by clarifying the distance A1 range, the thickness of the weak area can be maintained in the manufacturing process, which not only ensures quality control in mass production but also can improve the stability of the production process.Thus, excessive clearance is prevented from lengthening the path of external liquid penetration, improving the ability of the sealing layer to evenly cover the water pressure, and reducing the overall volume while maintaining a safety clearance, which is conducive to the lightweight and miniaturized design of the battery pack.

[0014] Optionally, the distance A1 between the second convex surface and the cap end face is greater than or equal to 0.3 mm and less than 1.2 mm. The narrow interval design ensures that the water seal element fits more evenly against the cell end face, thereby greatly improving long-term leakage protection performance, precisely controlling the gap, reducing temperature fluctuations or fatigue damage to the water seal layer under mechanical impact, and extending the service life. By setting the range of distance A1, the thickness of the water seal layer in the weak area can be controlled as much as possible under the effective water seal protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature and other abnormal situations.Furthermore, by clarifying the range of the gap A1, the thickness of the weak point area can be maintained in the manufacturing process, which not only ensures quality control in mass production but also improves the stability of the production process. Thus, excessive gap prevents the path of external fluid penetration from being extended, improves the ability of the sealing layer to evenly cover water pressure, and reduces the overall volume while maintaining a safe distance, which is conducive to the lightweight and miniaturized design of the battery pack.

[0015] Optionally, the water sealing element is a non-metallic material with a thermal softening temperature greater than or equal to 90°C. By setting the water sealing element as a non-metallic material with a thermal softening temperature greater than or equal to 90°C, the water sealing element can soften spontaneously during the heating process of the abnormal unit cell. At this time, the abnormal unit cell can break through the water sealing element in the weak area more quickly, thereby providing a safe pressure relief mechanism to prevent continuous deflagration from affecting the adjacent unit cell or the adjacent cell assembly. At the same time, in order to achieve a stable and effective waterproof effect, it can also be unaffected by temperature during the heating process of the normal unit cell.

[0016] Optionally, the water seal element is made of acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polypropylene (PP), polyethylene (PE), nylon, polyamide (PA), and / or glass fiber. By setting the water seal element as any material in acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polypropylene (PP), polyethylene (PE), nylon, polyamide (PA), and / or glass fiber, the water seal element can soften on its own during the heating process of the abnormal unit cell. At this time, the abnormal unit cell can break through the water seal element in the weak area more quickly, thereby providing a safe pressure relief mechanism to avoid continuous deflagration affecting the adjacent unit cell or adjacent cell assembly.At the same time, in order to achieve a stable and effective waterproof effect, it cannot be affected by the temperature during the heating process of the normal unit cell.

[0017] Optionally, the thickness of the waterproofing element is greater than 0.3 mm and less than or equal to 3 mm. By specifying the thickness of the waterproofing element, the thickness of the weak area can be controlled as much as possible to avoid breakage. At the same time, 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.

[0018] Optionally, the water sealing element is a water sealing plate with uneven thickness, the thickness of the water sealing element at the exposed hole being less than or equal to the thickness of the water sealing element outside the exposed hole, and the water sealing element is formed in the weak region of the exposed hole. When the cell experiences abnormal overtemperature, it usually exhibits a high voltage and temperature fire in the first cell end face region. At this time, the abnormal unit cell can quickly break through the water sealing plate in the weak region, thereby providing a safe pressure relief mechanism to avoid affecting the adjacent unit cell or cell assembly, so that continuous deflagration occurs.

[0019] Optionally, the first cell end face has a negative terminal end face. There is a separator between the negative terminal end face and the positive terminal end face. At the first cell end face, the exposed hole exposes the first edge, with the edge of the negative terminal end face near the center axis of the unit cell being the first edge, and the projection distance C between the first edge and the edge within the exposed hole being greater than or equal to 0.1 mm. With a distance between the exposed hole and the first edge, the water sealing layer can directly cover the negative terminal end face and the positive terminal end face, which not only structurally improves the insulating insulation but also allows the water sealing layer to cover the negative terminal end face and the separator. Once the separator breaks or fails due to aging, the water sealing layer becomes an additional barrier layer that prevents water vapor from penetrating the cell.At the same time, the waterproofing layer covers the negative terminal end face and the exposed hole, so that the water vapor does not penetrate into the end face of the cell along its length from the mounting gaps of the receiving slot and further comes into contact with the positive terminal end face and negative terminal end face to avoid a potential short circuit.

[0020] Optionally, the hole height D of the exposed hole is greater than or equal to 0.5 mm and less than or equal to 2.5 mm, which can achieve effective support strength for the unit cell, preventing the position of the unit cell from shifting due to vibration or other external forces during normal use, thus improving the overall mechanical stability and safety of the battery pack. Because the height D is less than or equal to 2.5 mm, the use of unnecessary materials can be avoided while strengthening the support force, thereby optimizing the weight of the battery pack and further improving energy efficiency and endurance performance. When designing the height range, the utilization rate of the cell's internal space is also considered.Based on safe mechanical support, the appropriate setting of the height inside the hole avoids unnecessary occupancy of the effective space of the battery pack, so that the battery pack can maximize the capacity and energy density within the limited space.

[0021] Optionally, the cell holder has a receiving slot, wherein the other end of the receiving slot has an exposed hole extending through the cell holder, wherein the area within the exposed hole is smaller than the cross-sectional area of ​​the receiving slot parallel to the exposed hole, wherein the area of ​​the exposed hole is smaller than the maximum area of ​​the first cell end surface, which enables effective positioning.

[0022] Optionally, the waterproofing layer is provided at the second end of the cell holder through an adhesive or vacuum deposition process. The waterproofing layer covers the first cell end face and the second cell end face of the unit cell to prevent short circuits caused by contact between the first cell end face, the second cell end face, and the outside water vapor.

[0023] Optionally, the positioning element is a positioning hole, wherein the cell holder has a positioning post that adapts to the positioning hole, wherein the positioning post has a size of 1 mm-10 mm, which enables effective positioning.

[0024] Optionally, the positioning element is a positioning post, wherein the positioning post has a size of 0.5 mm to 2 mm, wherein the cell holder has a positioning hole that adapts to the positioning post, wherein the positioning hole can accommodate some or all of the positioning posts, enabling effective positioning. Illustration of the attached drawings

[0025] One or more embodiments are illustrated by way of example with reference to the figures of the accompanying drawings, wherein the exemplary figures do not represent a limitation of the embodiments. Fig. 1 is a three-dimensional plan view of a tool battery pack provided by an embodiment of the present application; Fig. 2 is a bottom three-dimensional view of a tool battery pack provided by an embodiment of the present application; Fig. 3 is a view of the internal structure of a tool battery pack provided by an embodiment of the present application; Fig. 4 is an exploded diagram of the internal structure of a tool battery pack provided by an embodiment of the present application; Fig. 5 is a cross-sectional view of a unit cell provided by an embodiment of the present application; Fig. 6 is a three-dimensional view of a first end surface of a water sealing plate of a tool battery pack provided by an embodiment of the present application; Fig. 7 is a three-dimensional view of a second end surface of a water sealing plate of a tool battery pack provided by an embodiment of the present application; Fig. 8 is a partially enlarged sectional view of a water sealing plate of a tool battery pack at location A provided by an embodiment of the present application; Fig. 9 shows the partial assembly of a waterproofing plate, a waterproofing layer, a cell holder, and a unit cell according to an embodiment of the present application; Fig. 10 is a partial sectional view of the internal structure of a tool battery pack provided by an embodiment of the present application, with the waterproofing plate and the waterproofing layer hidden; Fig. 11 is a partial three-dimensional perspective view of an output electrode holder provided by an embodiment of the present application; Fig. 12 is a front view of an output electrode holder provided by an embodiment of the present application; Fig. 13 is an internal structural view of the tool battery pack provided by an embodiment of the present application; Fig. 14 is a three-dimensional view of a connecting element provided by an embodiment of the present application; Fig. 15 is a front view of the first welding holder provided by an embodiment of the present application; Fig. 16 is a front view of the second welding holder provided by an embodiment of the present application; Fig. 17 is a graph of temperature change data of a 60V cell and cell end area in a 30A discharge mode provided by an embodiment of the present application; Fig. 18 is a graph of temperature change data of a thermally runaway cell and neighboring cells provided by an embodiment of the tool battery pack of the present application. Specific embodiments

[0026] In order to clarify the purpose, technical solutions, and advantages of the embodiments of the present application, the various embodiments of the present application are described in detail below in conjunction with the accompanying drawings. A person skilled in the art will appreciate that in the various embodiments of the present application, certain technical details are disclosed merely for clarity. Even without these technical details, as well as without various variations and modifications based on the following embodiments, the technical solution to be protected by the present application can be achieved. The following embodiments are divided for the sake of simplicity and do not represent a limitation on the specific configuration of the present application.Each embodiment may be combined with or refer to any other, provided they do not contradict each other.

[0027] In the current state of the art, existing tool battery packs typically consist of a single-parallel cell assembly or a double-parallel cell assembly to form a battery pack. The unit cells in the battery pack are arranged in groups. The cell end face is usually connected to a conductive pole piece and a control board. To prevent short circuits between the unit cells, the cell end face must be covered with a waterproofing material, keeping the unit cells relatively separate from each other.The conventional waterproofing process usually involves covering the waterproofing material and allowing it to stand for a period of time before entering the subsequent assembly process. This results in the overall production efficiency being limited by the solidification time of the waterproofing material. At the same time, the power of conventional tools and the charging and discharging requirements are not high, and the probability of thermal runaway in the battery pack is very low. However, with the increase in tool power, the local temperature gradient expands due to the increase in charging and discharging speed, and the risk of thermal runaway is greatly increased. Irreversible overtemperature conditions occur in thermally runaway cells, and the temperature of the cell end face of the unit cell rises sharply.Typically, a fire occurs at the cell end face at high voltage and high temperature. If the thermally runaway cell is left unchecked, the surface temperature of the adjacent cell will be affected by the heat propagation from the thermally runaway cell, and the thermal runaway will then spread to the entire battery pack.

[0028] The temperature rise of the cell end surface of the 60V unit cell 21 during the 30A discharge process is approximately 60°C. As the current increases, the temperature rise of the cell end surface also increases. If the cell end surface temperature of the unit cell continues to rise during the charge and discharge process, and when the cell end surface temperature reaches 100°C, the surface temperature of the adjacent cell will continue to rise as the temperature of the thermally runaway cell rises. And the thermally runaway cell will experience irreversible overtemperature at 283.6°C, causing the end surface temperature of the unit cell to rise rapidly. It usually exhibits a high-voltage and high-temperature fire in the area of ​​the first cell end surface 211.If the thermally runaway cell is not controlled, the surface temperature of the adjacent cell will be affected by the heat propagation of the thermally runaway cell, and then the thermal runaway cell will spread to the entire battery pack. If the thermally runaway unit cell is not controlled, the surface temperature of the adjacent cell will be affected by the heat propagation of the thermally runaway cell, and then the thermal runaway will spread to the entire battery pack.

[0029] The inventor of this application discovered the above-mentioned deficiencies and analyzed the causes of the deficiencies by investigating the internal temperatures of over-temperature cells and thermal runaway cells of power tool battery packs and the heat transfer of battery packs as a whole in the prior art, and skillfully overcame the problems of the large size of power tool battery packs and the low productivity of battery packs by incorporating waterproof parts and rationally designing the structure and materials, and was able to provide rapid pressure relief for thermal runaway cells to avoid the secondary thermal runaway triggering of the battery packs.

[0030] An embodiment will be presented below with reference to the drawings, a more detailed description of the embodiment of this application: With reference to Fig. 1- Fig. 18, a tool battery pack comprises a housing assembly 1, a cell assembly 2, a pole piece holder 3, and a control device 4, wherein the housing assembly 1 is used to accommodate the cell assembly 2, the pole piece holder 3, and the control device 4; wherein the control device 4 is connected to the pole piece holder 3 and the cell assembly 2, wherein the housing assembly 1 has a first cooling opening 11, a holder seat (not shown), an opening 13, and a second cooling opening 14; wherein the opening 13 is arranged corresponding to the location of the pole piece holder 3 in the housing assembly 1 so that the tool pole piece penetrates it and connects to the pole piece holder 3;wherein a second cooling opening 14 is arranged on the side of the battery pack with the opening 13, wherein the first cooling opening 11 and the second cooling opening 14 are provided opposite each other on the surface of the housing assembly 1, wherein the first cooling opening 11 is an air inlet, while the second cooling opening 14 is an air outlet, wherein a linear air channel is formed by the arrangement of the first cooling opening 11 and the second cooling opening 14, so that such a direct ventilation path helps the airflow to flow through the battery pack more efficiently, thereby ensuring that the internal temperature of the battery pack is always kept within a safe range, which greatly improves the heat dissipation efficiency of the battery pack and reduces the risk of explosion caused by cell overheating;wherein holder seats (not shown) are provided on at least one side of the housing assembly 1 for fixing the cell assembly 2 to prevent movement of the cell holder 22 in the housing assembly 1; wherein the total area of ​​the first cooling opening 11 is larger than the total area of ​​the second cooling opening 14, wherein the air flow enters the housing assembly 1 through the first cooling opening 11 and is then discharged from the second cooling opening 14, wherein the first cooling opening 11 has a larger area which promotes the introduction of more cold air so that the cold air can fully come into contact with the cell assembly 2;

[0031] In a specific embodiment, the housing assembly 1 also has a third cooling opening 15, wherein the third cooling opening 15 is arranged on a different side of the housing assembly 1 than the side on which the first cooling opening 11 and the second cooling opening 14 are located, so that the air flow can enter the battery pack from this side. The air flow passing through the third cooling opening 15 and the air flow passing through the first cooling opening 11 converge into a single air flow, which is discharged from the second cooling opening 14. With the addition of a third cooling opening 15, the air flow can enter the battery pack in different directions, so that the heat of the cell assembly 2 can be distributed more evenly, thereby avoiding the phenomenon of local overheating.Converging the airflow inside can cover the cell surface more comprehensively and efficiently, maintaining overall heat balance and further enhancing the heat dissipation capacity of the battery pack. This not only increases air circulation and improves the efficiency of internal heat exchange, but also allows the battery pack to fully dissipate heat through other inlet ports even if one cooling port is partially blocked due to external factors, thus ensuring the reliability of the cooling system. This heat dissipation method, with multiple inlet ports and a single outlet port, contributes to a faster reduction of the cell surface temperature.

[0032] In a specific embodiment, the housing assembly 1 also includes a third cooling opening 15. The third cooling opening 15 is located on any one of the two opposite sides of the housing assembly 1 other than the side where the first cooling opening 11 and the second cooling opening 14 are located, so that the air flow can enter the battery pack from this opposite side. The air flow passing through the third cooling opening 15 and the air flow passing through the first cooling opening 11 form a single air flow, which is discharged from the second cooling opening 14. With the addition of a third cooling opening 15, the air flow can enter the battery pack in different directions, so that the heat of the cell assembly 2 can be distributed more evenly, thereby avoiding the phenomenon of local overheating.Converging the airflow inside can cover the cell surface more comprehensively and efficiently, maintaining overall heat balance and further enhancing the heat dissipation capacity of the battery pack. This not only increases air circulation and improves the efficiency of internal heat exchange, but also allows the battery pack to fully dissipate heat through other inlet ports even if one cooling port is partially blocked due to external factors, thus ensuring the reliability of the cooling system. This heat dissipation method, with multiple inlet ports and a single outlet port, contributes to a faster reduction of the cell surface temperature.

[0033] In a specific embodiment, the total area of ​​the third cooling opening 15 is less than or equal to the total area of ​​the second cooling opening 14, thereby solving the problem of localized overheating caused by a single airflow direction. Airflow in the lateral or other directions can flow sufficiently to ensure uniform heat dissipation in all parts of the cell, thus avoiding performance losses or risks due to locally confined high temperatures.The refined arrangement of the cooling holes can better control the temperature gradient in different areas of the device, and the arrangement with multiple inlet holes and one outlet hole makes it possible to ensure sufficient airflow and heat dissipation in the remaining cooling holes when one of the cooling holes fails due to external blockage or other problems, thus ensuring the continuity and reliability of the system.

[0034] In a specific embodiment, the total area of ​​the third cooling opening 15 is larger than the total area of ​​the second cooling opening 14, thus solving the problem of localized overheating caused by a single airflow direction. Airflow in the lateral or other directions can flow sufficiently to ensure uniform heat dissipation in all parts of the cell, thus avoiding performance losses or risks due to locally confined high temperatures.The refined arrangement of the cooling holes can better control the temperature gradient in different areas of the device, and the arrangement with multiple inlet holes and one outlet hole makes it possible to ensure sufficient airflow and heat dissipation in the remaining cooling holes when one of the cooling holes fails due to external blockage or other problems, thus ensuring the continuity and reliability of the system.

[0035] In a specific embodiment, the second cooling opening 14 is provided in a central area on one side of the housing assembly 1 with an opening 13, this side facing the first cooling opening 11, so that the airflow can cover the surface of the cell assembly 2 more evenly. Distributing the airflow from the center to the periphery reduces the problem of local heat concentration and contributes to maintaining a uniform temperature distribution inside the battery pack.

[0036] In a specific embodiment, the second cooling opening 14 is provided near the opening 13 in a central area on one side of the housing assembly 1 with an opening 13, which side faces the first cooling opening 11, so that the airflow can cover the surface of the cell assembly 2 more evenly. Distributing the airflow from the center to the periphery reduces the problem of local heat concentration and contributes to maintaining a uniform temperature distribution inside the battery pack.

[0037] In a specific embodiment, the housing assembly 1 has a locking position 16. The housing assembly 1 is used to lock the battery pack to prevent movement of the battery pack. The opening 13 is provided in a central region on one side of the housing assembly 1 with an opening 13 between the second cooling opening 14 and the locking position 16, this side facing the first cooling opening 11, so that the airflow can cover the surface of the cell assembly 2 more evenly. The distribution of the airflow, which spreads from the center to the periphery, reduces the problem of local heat concentration and contributes to maintaining a uniform temperature distribution inside the battery pack.

[0038] In a specific embodiment, the housing assembly 1 is a 2-split mold combination, wherein the housing assembly 1 is constructed as a concave housing with openings on the top or on both sides, wherein the end caps are connected to the housing from the opening side; wherein the housing assembly 1 is a 3-split mold combination, wherein the housing assembly 1 is constructed as a one-piece, continuously split housing with openings on opposite sides, wherein the end caps are connected to the housing from the openings; wherein the housing assembly 1 is a 4-split mold combination, wherein the housing assembly 1 is constructed as a continuously split housing with openings on opposite sides, wherein the housing is attachable at the top and bottom, wherein the end caps are connected to the housing from the openings; wherein the housing assembly 1 is assembled without any particular restriction.In a specific embodiment, the housing assembly 1 further comprises a water outlet opening 113, wherein the water outlet opening 113 is provided on at least one side other than the surface of the battery pack on which the opening 13 is located, in order to drain water entering the housing assembly 1. As shown in . Fig. As shown in Figure 4, the cell assembly 2 includes a unit cell 21, a cell holder 22, a waterproofing layer 23, and a waterproofing member 24; the unit cell 21 is a cylindrical cell having a first cell end face 211 and a second cell end face 212.

[0039] With reference to Fig. 5, the first cell end surface 211 in a specific embodiment has a positive pole end surface 2111 and the positive pole end surface 2111 is a flat end surface. With reference to Fig. 5, in one embodiment, the first cell end face 211 has a positive pole end face 2111 and the positive pole end face 2111 has a cap end face 21111, the cap end face 21111 protruding outwardly from the positive pole end face 2111.

[0040] With reference to the Fig. 5 and 9-10, in a specific embodiment, the first cell end face 211 has a positive terminal face 2111 and also a negative terminal face 2112. A separator 2113 is provided between the negative terminal face 2112 and the positive terminal face 2111 to isolate the positive electrode from the negative electrode to prevent short circuiting. At the first cell end face 211, the exposed hole 222 exposes the first edge, with the edge of the negative terminal face 2112 near the central axis of the unit cell 21 being the first edge, and the projection distance C between the first edge and the edge within the exposed hole 222 being greater than or equal to 0.1 mm. With a distance between the exposed hole 222 and the first edge, not only is the insulating insulation structurally improved, but also the waterproofing layer 23 is allowed to cover the negative terminal end face 2112 and the separator 2113.Once the separator 2113 breaks or fails due to aging, the waterproofing layer 23 becomes an additional barrier layer that prevents water vapor from penetrating the cell. At the same time, the waterproofing layer 23 covers the negative terminal end face 2112 and the exposed hole 222, preventing water vapor from penetrating the cell end face along its length from the mounting gaps of the receiving slot 221 and further from contacting the positive terminal end face 2111 and the negative terminal end face 2112, thus preventing a potential short circuit.

[0041] With reference to Fig. 4, the cell holder 22 has a receiving slot 221, an exposed hole 222, a first end 223, a second end 224, wherein the first end 223 of the cell holder 22 has a receiving slot 221 that receives the unit cell 21, wherein one end of the receiving slot 221 has a groove into which the unit cell 21 projects, wherein the other end of the receiving slot 221 has an exposed hole 222 that extends through the cell holder 22, wherein the area within the exposed hole 222 is smaller than the cross-sectional area of ​​the receiving slot 221 that is parallel to the exposed hole 222, wherein the area of ​​the exposed hole 222 is smaller than the maximum area of ​​the first cell end surface 211 that extends into the receiving slot 221, wherein the shape of the exposed hole 222 has a rounded shape, a includes, but is not limited to, oval shape, square shape and other shapes;wherein the cell holder 22 is securely attached to the holder seat 12 within the housing assembly 1 by means of, but not limited to, a welded or screwed connection to provide additional structural support and protection against vibrations;

[0042] With reference to Fig. 10, in a specific embodiment, the cell holder 22 has a limiting portion 225 that cooperates with the holder seat 12, the limiting portion 225 having a locking element 2251, the locking element 2251 being in a form that includes, but is not limited to, a structural locking shape, the locking element 2251 being a screw hole, or being screwed in place by a screw, or the locking element 2251 being a first slot and tenon structure and being attached to the housing assembly 1 by a second slot and tenon structure by means of snapping in, or by welding the limiting portion 225 to the housing assembly 1, or by locking by gluing or other methods to ensure that the cell holder 22 does not move in the housing assembly 1.

[0043] With reference to Fig. 9, in a specific embodiment, the hole 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. By setting the hole height D of the exposed hole 222 to greater than or equal to 0.5 mm, an effective support strength for the unit cell 21 can be achieved, preventing the position of the unit cell 21 from shifting due to vibration or other external forces during normal use, thus improving the overall mechanical stability and safety of the battery pack. Since it is less than or equal to 2.5 mm, the use of unnecessary materials can be avoided while strengthening the support force, thereby optimizing the weight of the battery pack and further improving energy efficiency and endurance performance. When designing the height range, the utilization rate of the cell's internal space is also taken into account.Based on safe mechanical support, the appropriate setting of the height inside the hole avoids unnecessary occupancy of the effective space of the battery pack, so that the battery pack can maximize the capacity and energy density within the limited space.

[0044] The waterproofing layer 23 is provided at the second end 224 of the cell holder 22 by an adhesive or vacuum deposition process. The waterproofing layer 23 covers the first cell end face 211 and the second cell end face 212 of the unit cell 21 to prevent a short circuit caused by contact between the first cell end face 211, the second cell end face 212, and the water vapor of the outside world. Referring to Fig. 6 to Fig. 10, the water sealing member 24 is provided at a second end 224 of the cell holder 22, the water sealing member 24 having a first end surface 241 remote from the cell holder 22 and a second end surface 242 located near the cell holder 22, and at least a part of the water sealing layer between the second end surface 242 and the cell holder 22.Compared with the conventional waterproofing method, which usually involves covering the waterproofing material and letting it stand for a period of time before entering the subsequent assembly process, resulting in the overall production efficiency being limited by the solidification time of the waterproofing material; by disposing a waterproofing member 24 having a second convex surface, this application can cover the cell holder 22 with the waterproofing layer 23 without waiting for the waterproofing layer 23 to dry out for subsequent assembly work, which greatly improves the efficiency of the production line, shortens the waiting time, and improves the flexibility and response speed of production.On the other hand, it ensures that the waterproofing layer 23 can be firmly bonded to the cell end face by the waterproofing member 24, limiting the peeling of the waterproofing layer 23 from the cell end face due to vibration and scratches. The thickness of the waterproofing layer 23 on the cell end face at the exposed hole 222 is thin, so that the abnormal unit cell 21 can quickly break through the waterproofing layer 23 in the weak area, thereby providing a safe pressure relief mechanism to prevent the adjacent unit cell or the adjacent cell assembly 2 from being affected, causing continuous deflagration.

[0045] With reference to Fig. 9, in a specific embodiment, the first end face 241 has a first convex surface 2411 at the exposed hole 222, which protrudes toward the end face of the unit cell 21, the second end face 242 being a flat surface, and the water sealing member 24 has a first convex surface 2411 at the position of the exposed hole 222, the water sealing member 24 being formed in the weak area of ​​the exposed hole 222. When the cell experiences abnormal overtemperature, it typically experiences a high-voltage and high-temperature fire in the area of ​​the first cell end face 211.At this time, the abnormal unit cell 21 can quickly break through the water seal plate in the weak area, thereby providing a safe pressure relief mechanism to avoid affecting the adjacent unit cell 21 or the adjacent cell assembly 2, so that continuous deflagration occurs.

[0046] With reference to Fig. 9, in a specific embodiment, the first end surface 241 has a first convex surface 2411 at the exposed hole 222, which protrudes toward the end surface of the unit cell 21, and the second end surface 242 is a flat surface, wherein the distance B between the first convex surface 2411 and the second end surface 242 is greater than 0.3 mm and less than or equal to 3 mm. By setting the range of the distance B between the first convex surface 2411 and the second end surface 242, the thickness of the weak area can be controlled as much as possible to be easily broken. At the same time, it effectively prevents the problem of the waterproofing layer being broken due to improper operation during the pressing process, and ensures that it simultaneously provides waterproof protection and a clear and controlled safe pressure relief channel for abnormal conditions such as high pressure and high temperature.In addition, by clarifying the range of B, the thickness of the weak point area can be maintained in the manufacturing process, which not only ensures quality control in mass production, but also can improve the stability of the production process.

[0047] In a specific embodiment, the second end surface 242 is not flat, and the second end surface 242 has a second convex surface 2421 at the exposed opening 222 protruding toward the end surface of the unit cell 21, wherein the distance A2 between the second convex surface 2421 and the positive terminal end surface 2111 is greater than or equal to 0.1 mm, or the distance A1 between the second convex surface 2421 and the cap end surface 21111 is greater than or equal to 0.1 mm. By setting the range of A1 and A2, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations.In addition, by clarifying the range of A1 and A2, the thickness of the weak point area can be maintained in the manufacturing process, which not only ensures quality control in mass production, but also can improve the stability of the production process.

[0048] In a specific embodiment, the second end surface 242 is not flat, and the second end surface 242 has a second convex surface 2421 at the exposed opening 222, which protrudes toward the end surface of the unit cell 21. The distance A2 between the second convex surface 2421 and the positive terminal end surface 2111 is greater than or equal to 0.1 mm or less than 2 mm, or the distance A1 between the second convex surface 2421 and the cap end surface 21111 is greater than or equal to 0.1 mm or less than 2 mm. By setting the range of A1 and A2, the thickness of the waterproofing layer in the weak area can be controlled as much as possible while providing effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations.In addition, by clarifying the range of A1 and A2, the thickness of the weak point area can be maintained in the manufacturing process, which not only ensures quality control in mass production, but also can improve the stability of the production process.

[0049] In a specific embodiment, the second end face 242 has a second convex surface 2421 at the exposed opening 222, which protrudes toward the end face of the unit cell 21, wherein the distance between the second convex surface 2421 and the positive terminal end face 2111 is greater than or equal to 0.5 mm and less than 1 mm, or the distance A1 between the second convex surface 2421 and the cap end face 21111 is greater than or equal to 0.5 mm and less than 1.5 mm. By setting the range of A1 and A2, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under the effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations.Furthermore, by clarifying the range of A1 and A2, the thickness of the weak point region can be maintained in the manufacturing process, which not only ensures quality control in mass production but can also improve the stability of the production process. In one embodiment, the second end face 242 has a second convex surface 2421 at the exposed opening 222 protruding toward the end face of the unit cell 11, wherein the distance A2 between the second convex surface 2421 and the positive terminal end face 2111 is greater than or equal to 0.3 mm and less than or equal to 0.8 mm, or the distance A1 between the second convex surface 2421 and the cap end face 21111 is greater than or equal to 0.3 mm and less than 1.2 mm.By specifying the range of A1 and A2, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under the effective protection of the waterproofing layer, providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations. Furthermore, by clarifying the range of A1 and A2, the thickness of the weak area can be maintained in the manufacturing process, which not only ensures quality control in mass production but also improves the stability of the production process.

[0050] With reference to Fig. 17, in a specific embodiment, the water sealing element 24 is a non-metallic material having a thermal softening temperature greater than or equal to 90°C. As in Fig. As shown in Figure 17, the temperature rise of the cell end face of the 60V unit cell 21 during the 30A discharge process is approximately 60°C. As the current increases, the temperature rise of the cell end face also increases. When the cell temperature exceeds abnormal values ​​during the charge and discharge process, a high-voltage and high-temperature fire is normally performed in the region of the first cell end face 211 to protect the unit cell 21. At this time, the temperature of the cell end face is normally above 100°C. Since the water seal member 24 is a non-metallic material with a thermal softening temperature greater than or equal to 90°C, the water seal member 24 may soften spontaneously during the heating process of the abnormal unit cell 21.At this time, the abnormal unit cell 21 can break through the water sealing element in the weak area more quickly, thereby providing a safe pressure relief mechanism to avoid continuous deflagration affecting the adjacent unit cell 21 or the adjacent cell assembly 2. At the same time, in order to achieve a stable and effective waterproof effect, it cannot be affected by temperature during the heating process of the normal unit cell 21.

[0051] In a specific embodiment, the water sealing element 24 is acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polypropylene (PP), polyethylene (PE), nylon, polyamide (PA) and / or glass fibers. By utilizing the water sealing element as any material in acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polypropylene (PP), polyethylene (PE), nylon, polyamide (PA) and / or glass fibers. By utilizing the water sealing element 24 as acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polypropylene (PP), polyethylene (PE), nylon, polyamide (PA) and / or glass fibers. By setting the water sealing member as any material in Acrylonitrile Butadiene Styrene (ABS), Polycarbonate (PC), Polypropylene (PP), Polyethylene (PE), Nylon, Polyamide (PA) and / or Glass fiber, the water sealing member 24 can soften by itself during the heating process of the abnormal unit cell 21.At this time, the abnormal unit cell 21 can break through the water sealing element in the weak area more quickly, thereby providing a safe pressure relief mechanism to avoid continuous deflagration affecting the adjacent unit cell 21 or the adjacent cell assembly 2. At the same time, in order to achieve a stable and effective waterproof effect, it cannot be affected by temperature during the heating process of the normal unit cell 21.

[0052] In a specific embodiment, the water sealing member 24 is a uniform-thickness water sealing plate whose thickness is greater than or equal to 0.3 mm and less than or equal to 3 mm. The water sealing member 24 has a first convex surface 2411 and a second convex surface 2421 at the exposed hole 222, which protrude toward the end face of the unit cell 21. The convex surface 2411 and the second convex surface are formed in the weak region of the exposed hole 222. When the cell experiences abnormal overtemperature, it typically experiences a high-voltage and high-temperature fire in the region of the first cell end face 211.At this time, the abnormal unit cell 21 can quickly break through the water seal plate in the weak area, thereby providing a safe pressure relief mechanism to avoid affecting the adjacent unit cell 21 or the adjacent cell assembly 2, so that continuous deflagration occurs.

[0053] In a specific embodiment, the water sealing member 24 is formed of uneven-thickness water sealing plates, the thickness of the water sealing member 24 at the exposed hole 222 being less than the thickness of the water sealing member 24 outside the exposed hole 222, and the water sealing member 24 is formed in the weak region of the exposed hole 222. When the cell experiences an abnormal overtemperature, it typically exhibits a high-voltage and high-temperature fire in the region of the first cell end face 211. At this time, the abnormal unit cell 21 can quickly break through the water sealing plate in the weak region, thereby providing a safe pressure relief mechanism to prevent the adjacent unit cell 21 or the adjacent cell assembly 2 from being affected, resulting in continuous deflagration.

[0054] With reference to Fig. 4 In a specific embodiment, the water sealing member 24 has a positioning member 226, wherein the positioning member 226 is a positioning hole, wherein the positioning post is provided in the cell holder 22, wherein the positioning post has a size of 1 mm-10 mm, which enables effective positioning.

[0055] In a specific embodiment, the water seal member 24 has a locating member 226, wherein the locating member 226 is a locating post, the locating post having a size of 0.5 mm to 2 mm, the locating hole being provided in the cell holder 22, the locating hole being capable of accommodating some or all of the locating; in one embodiment, the water seal member 24 forms a limited fit on the cell holder 22. Embodiments include, but are not limited to, snap-together structural connections, welding, gluing, and other forms of process connection that are not limited to a mortise and tenon structure.

[0056] With reference to Fig. 10 - Fig. 12, the pole piece holder 3 has a terminal assembly 32, a terminal mounting seat 33, the terminal mounting seat 33 having a guide slot 331, a mounting end 332, and a water sealing space 333, the guide slot 331 being used to guide the tool pole piece in the correct insertion direction to avoid a short circuit caused by the installation error, and at the same time still being used to stabilize the tool pole piece to ensure that it is effectively connected to the control device 4; the mounting end 332 being used for firmly connecting to the control device 4.The water sealing space 333 includes a first water sealing space 3331, a second water sealing space 3332, wherein the first water sealing space 3331 is a mounting gap between the terminal mounting seat 33 and the terminal assembly 32 when the terminal mounting seat 33 is limited to the terminal assembly 32, wherein the second water sealing space 3332 is a mounting gap between the terminal mounting seat 33 and the control device 4, wherein the second water sealing space 3332 has at least one inlet opening 33321, wherein the inlet opening 33321 is arranged between the terminal mounting seat 33 in the control device 4.The position of the inlet opening 33321 is designed to facilitate the waterproofing material's rapid and even penetration into and filling the second waterproofing chamber 3332 during operation, achieving efficient waterproofing during assembly and maintenance and maintaining the safe operation of the control device for a long time. Completely filling the second waterproofing chamber 3332 provides a basic waterproofing barrier for the terminal assembly 32, protecting the internal structure from moisture and contaminants that could cause the control board to malfunction.

[0057] In a specific embodiment, the fixing end 332 has a height of greater than or equal to 0.5 mm and less than or equal to 3 mm in a columnar shape, the first end of the fixing end 332 being connected to the terminal fixing seat 33, the second end being connected to the control device 4, the fixing end 332 supporting the terminal fixing seat 33 so that the terminal fixing seat 33 is not in contact with the control device 4, the second water sealing space 3332 being the projection area from the terminal fixing seat 33 in the control device 4, the terminal fixing seat 33 being located in the non-contact space between control devices 4.In one embodiment, the terminal fixing seat 33 has a fixing end 332 in a protruding shape on the side close to the control device 4, the fixing end 332 being connected to the control device 4, the fixing end 332 supporting the terminal fixing seat 33 so that the terminal fixing seat 33 is not in contact with the control device 4, the second water sealing space 3332 forming the projection area of ​​the terminal fixing seat 33 in the control device 4, the terminal fixing seat 33 being located in a non-contact space between control devices 4.

[0058] In a specific embodiment, the waterproofing material of the first waterproofing space 3331 and the second waterproofing space 3332 is encapsulated in a single molded part by vacuum deposition, wherein the height distance of the inlet opening 33321 is greater than or equal to 0.5 mm and / or the lowest height distance of the second waterproofing space 3332 is greater than or equal to 0.5 mm. A distance greater than or equal to 0.5 mm allows the waterproofing material to be better filled into the second waterproofing space 3332 under the compression of the overall size of the battery pack by vacuum deposition, while preventing the central region of the second waterproofing space 3332 from being filled in place and the waterproofing material from being unevenly distributed in the second waterproofing space 3332.In one embodiment, the waterproofing material of the first waterproofing space 3331 and the second waterproofing space 3332 is encapsulated in a single molded part by low-pressure injection molding, wherein the height distance of the inlet opening 33321 is greater than or equal to 0.8 mm and / or the lowest height distance of the second waterproofing space 3332 is greater than or equal to 0.8 mm. A distance greater than or equal to 0.8 mm allows the waterproofing material to be better filled into the second waterproofing space 3332 by low-pressure injection molding under the compression of the overall size of the battery pack, preventing the central region of the second waterproofing space 3332 from being filled in place and the waterproofing material from being unevenly distributed in the second waterproofing space 3332.

[0059] In a specific embodiment, the waterproofing material of the first waterproofing space 3331 and the second waterproofing space 3332 is encapsulated in a single molded part by the glue filling, wherein the height distance of the inlet opening 33321 is greater than or equal to 0.5 mm and / or the lowest height distance of the second waterproofing space 3332 is greater than or equal to 0.5 mm. By setting a distance greater than or equal to 0.5 mm, the waterproofing material can be better filled into the second waterproofing space 3332 under the compression of the overall size of the battery pack by means of glue filling, while preventing the central region of the second waterproofing space 3332 from being filled in place and the waterproofing material from being unevenly distributed in the second waterproofing space 3332.

[0060] The control device 4 is provided on the cell holder 22, the control device 4 having a control board 41 and a connector 42, the control board 41 having at least a control module and a communication module, the control board 41 connecting the unit cell 21 from the exposed hole 222 through the connector 42 to achieve at least the communication and control functions, the control module serving to regulate parameters such as the voltage, the current and the temperature in the battery pack to ensure the safe and efficient operation of the entire system, the communication module serving to exchange data with an external device to realize the monitoring of the operating state of the battery pack.

[0061] With reference to Fig. 14 - Fig. 16, the connecting member 42 includes unit cell detection elements 421 and connecting pole pieces 422, the unit cell detection element 421 having a first connection end 4211 and a second connection end 4212, the connecting pole piece 422 being connected to the first connection end 4211, the connecting pole piece 422 being connected to the unit cell 21 through the exposed hole 222, and the second connection end 4212 being connected to the control board 41 by welding to avoid problems that the terminals have poor waterproof performance due to messy wiring through the terminal connection and control board and are inconvenient to maintain inside the battery pack.

[0062] In a specific embodiment, the second connection end 4212 has at least one first welding plate 42121 corresponding to the number of unit cells 21, wherein the control board 41 has at least one second welding plate 411 corresponding at least to the number of first welding plates 42121 at the second connection end 4212, wherein the area of ​​the first welding plate 42121 is less than or equal to the area of ​​the second welding plate 411. With the construction that the area of ​​the first welding plate 42121 is less than or equal to the area of ​​the second welding plate 411, a smaller area of ​​the first welding plate 42121 allows it to fully adhere to the larger second welding plate 411, reducing the risk of possible short circuits between adjacent welding plates, thereby improving the safety and reliability of the circuit and ensuring good thermal conduction and electrical connection.At the same time, the smaller weld plate acts on the larger weld plate during thermal expansion, reducing the mechanical stress caused by thermal expansion and contraction, thus reducing fatigue and potential cracking at the brazing joints. This configuration increases the mechanical strength of the weld and improves the stability and durability of the joint.

[0063] In a specific embodiment, the second connection end 4212 has at least one first welding plate 42121 corresponding to the number of unit cells 21, wherein the control board 41 has at least one second welding plate 411 corresponding at least to the number of first welding plates 42121 at the second connection end 4212, wherein the first welding plate 42121 has at least one through-hole 42122 passing through the first welding plate 42121, wherein the ratio between the opening of the through-hole 42122 and the width of the welding plate of the first welding plate 42121 in which the opening is located is less than or equal to 1:2.By setting a ratio of less than or equal to 1:2 between the opening of the through-hole 42122 and the width of the weld plate of the first weld plate 42121, in which the opening is located, the solder penetration ability through the through-hole during the soldering process is increased, improving the mechanical strength and the strength of the conductive connection. The through-hole allows for better solder filling to form a more robust and better conductive connection.

[0064] In a specific embodiment, the second connection end 4212 has at least one first welding plate 42121 corresponding to the number of unit cells 21, wherein the control board 41 has at least one second welding plate 411 corresponding at least to the number of first welding plates 42121 at the second connection end 4212. In the first welding plate 42121 and / or the second welding plate 411, the minimum distance e between adjacent welding plates is greater than or equal to 0.2 mm and less than or equal to 2 mm. By setting the minimum distance e between adjacent welding plates to be greater than or equal to 0.2 mm and less than or equal to 2 mm, the risk of a short circuit due to solder bridges or contamination by conductive particles is effectively reduced, and welding defects triggered by prestress in the manufacturing process can also be reduced.During manufacturing and operation, increased spacing provides greater tolerance for errors in soldering and subsequent operations, increases overall circuit safety and reliability, prevents signal crosstalk, improves signal integrity and transmission efficiency, and allows each area of ​​the weld plate to effectively dissipate heat, avoiding excessive concentration of local overheating problems caused by increased weld plate spacing, allowing better heat diffusion and control.

[0065] In a specific embodiment, the second connection end 4212 has at least one first welding plate 42121 corresponding to the number of unit cells 21, and the control board 41 has at least one second welding plate 411 corresponding to at least the number of first welding plates 42121 at the second connection end 4212. The distance f between the peripheral component and the adjacent welding area of ​​the first welding plate 42121 and / or the second welding plate 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 welding plate and the peripheral components can be increased, which contributes to reducing mutual interference due to 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, the increased distance between the components and the weld plate reduces the risk of short circuits due to accidental contact or material bridging (e.g., solder overflow), and the danger of a short circuit, which can lead to a larger safety margin for production and subsequent operation of the device. The increased distance also improves the thermal diffusion capabilities of the circuit board, allowing heat to be more effectively dissipated from the high-temperature zone, preventing local overheating and heat buildup problems.

[0066] In a specific embodiment, the first welding plate 42121 and / or the second welding plate 411 has a tinning thickness of 0.05-0.15 mm. The tinning thickness of 0.05-0.15 mm serves to improve the galvanic insulation effect of the soldering area by reducing excessive solder flow during the soldering process and reducing the risk of solder bridges and short circuits.

[0067] An embodiment of the present application is described in more detail below in conjunction with the accompanying drawings: A tool battery pack comprises a housing assembly 1, a cell assembly 2, a pole piece holder 3, and a control device 4; the housing assembly 1 has a holder seat (not shown), an opening 13 used to receive the cell assembly, the pole piece holder, and the control device; the opening 13 is arranged corresponding to the location of the pole piece holder 3 in the housing assembly 1 so that the tool pole piece penetrates it and connects to the pole piece holder 3; the holder seat (not shown) is provided on at least one side within the housing assembly 1 to secure the electrical cell assembly 2. As shown in Fig. As shown in Figure 4, the cell assembly 2 includes a unit cell 21, a cell holder 22, a waterproofing layer 23, and a waterproofing member 24; the unit cell 21 is a cylindrical cell having a first cell end face 211 and a second cell end face 212.

[0068] With reference to Fig. 5, in a specific embodiment, the first cell end surface 211 has a positive pole end surface 2111 and the positive pole end surface 2111 is a flat end surface.

[0069] With reference to Fig. 5, in a specific embodiment, the first cell end face 211 has a positive pole end face 2111 and the positive pole end face 2111 has a cap end face 21111, wherein the cap end face 21111 protrudes outwardly from the positive pole end face 2111.

[0070] With reference to the Fig. 5 and Fig. 9, in a specific embodiment, the first cell end face 211 has a positive terminal face 2111 and also a negative terminal face 2112. A separator 2113 is provided between the negative terminal face 2112 and the positive terminal face 2111 to isolate the positive electrode from the negative electrode to prevent short circuiting. At the first cell end face 211, the exposed hole 222 exposes the first edge, with the edge of the negative terminal face 2112 near the central axis of the unit cell 21 being the first edge, and the projection distance C between the first edge and the edge within the exposed hole 222 being greater than or equal to 0.1 mm. With a distance between the exposed hole 222 and the first edge, not only is the insulating insulation structurally improved, but also the waterproofing layer 23 is allowed to cover the negative terminal end face 2112 and the separator 2113.Once the separator 2113 breaks or fails due to aging, the waterproofing layer 23 becomes an additional barrier layer that prevents water vapor from penetrating the cell. At the same time, the waterproofing layer 23 covers the negative terminal end face 2112 and the exposed hole 222, preventing water vapor from penetrating the cell end face along its length from the mounting gaps of the receiving slot 221 and further from contacting the positive terminal end face 2111 and the negative terminal end face 2112, thus preventing a potential short circuit.

[0071] With reference to Fig. 4, the cell holder 22 has a receiving slot 221, an exposed hole 222, a first end 223, a second end 224, wherein the first end 223 of the cell holder 22 has a receiving slot 221 that receives the unit cell 21, wherein one end of the receiving slot 221 has a groove into which the unit cell 21 projects, wherein the other end of the receiving slot 221 has an exposed hole 222 that extends through the cell holder 22, wherein the area within the exposed hole 222 is smaller than the cross-sectional area of ​​the receiving slot 221 that is parallel to the exposed hole 222, wherein the area of ​​the exposed hole 222 is smaller than the maximum area of ​​the first cell end surface 211 that extends into the receiving slot 221, wherein the shape of the exposed hole 222 has a rounded shape, a includes, but is not limited to, oval shape, square shape and other shapes;wherein the cell holder 22 is securely attached to the holder seat 12 within the housing assembly 1 by means of, but not limited to, a welded or screwed connection to provide additional structural support and protection against vibrations;

[0072] With reference to Fig. 10, in one embodiment, the cell holder 22 includes a limiting portion 225 that cooperates with the holder seat 12, the limiting portion 225 including a locking element (not shown), the locking element (not shown) being in a form that includes, but is not limited to, a structural locking shape, the locking element (not shown) being a screw hole, or being screwed into place by a screw, or the locking element (not shown) being a first slot and tenon structure and being attached to the housing assembly 1 by a second slot and tenon structure by snapping it in, or by welding the limiting portion 225 to the housing assembly 1, or by locking it by gluing or other methods to ensure that the cell holder 22 does not move within the housing assembly 1.

[0073] With reference to Fig. 9, in one embodiment, the hole 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. By setting the hole height D of the exposed hole 222 to greater than or equal to 0.5 mm, an effective support strength for the unit cell 21 can be achieved, preventing the position of the unit cell 21 from shifting due to vibration or other external forces during normal use, thus improving the overall mechanical stability and safety of the battery pack. Since it is less than or equal to 2.5 mm, the use of unnecessary materials can be avoided while strengthening the support force, thereby optimizing the weight of the battery pack and further improving energy efficiency and endurance performance. When designing the height range, the utilization rate of the cell's internal space is also taken into account.Based on secure mechanical support, the appropriate setting of the height within the hole avoids unnecessary occupancy of the effective space of the battery pack, allowing the battery pack to maximize its capacity and energy density within the limited space. The waterproofing layer 23 is provided at the second end 224 of the cell holder 22 through an adhesive or vacuum deposition process. The waterproofing layer 23 covers the first cell end face 211 and the second cell end face 212 of the unit cell 21 to prevent a short circuit caused by contact between the first cell end face 211 and the second cell end face 212, and the outside water vapor.

[0074] With reference to the Fig. 6 to Fig. 10, the waterproofing member 24 is provided at a second end 224 of the cell holder 22, the waterproofing member 24 having a first end surface 241 remote from the cell holder 22 and a second end surface 242 proximate the cell holder 22, and at least a portion of the waterproofing layer between the second end surface 242 and the cell holder 22. The addition of the waterproofing member 24 eliminates the need to wait for the waterproofing layer to dry for subsequent assembly work after covering the waterproofing layer 23 on the cell holder 22, which greatly improves production line efficiency, reduces waiting time, and improves production flexibility and responsiveness.

[0075] With reference to Fig. 9, in a specific embodiment, the first end face 241 has a first convex surface 2411 at the exposed hole 222, which protrudes toward the end face of the unit cell 21, the second end face 242 being a flat surface, and the water sealing member 24 has a first convex surface 2411 at the position of the exposed hole 222, the water sealing member 24 being formed in the weak area of ​​the exposed hole 222. When the cell experiences abnormal overtemperature, it typically experiences a high-voltage and high-temperature fire in the area of ​​the first cell end face 211.At this time, the abnormal unit cell 21 can quickly break through the water seal plate in the weak area, thereby providing a safe pressure relief mechanism to avoid affecting the adjacent unit cell 21 or the adjacent cell assembly 2, so that continuous deflagration occurs.

[0076] With reference to Fig. 9, in a specific embodiment, the first end surface 241 has a first convex surface 2411 at the exposed hole 222, which protrudes toward the end surface of the unit cell 21, and the second end surface 242 is a flat surface, wherein the distance B between the first convex surface 2411 and the second end surface 242 is greater than 0.3 mm and less than or equal to 3 mm. By setting the range of the distance B between the first convex surface 2411 and the second end surface 242, the thickness of the weak area can be controlled as much as possible to be easily broken. At the same time, it effectively prevents the problem of the waterproofing layer being broken due to improper operation during the pressing process, and ensures that it simultaneously provides waterproof protection and a clear and controlled safe pressure relief channel for abnormal conditions such as high pressure and high temperature.In addition, by clarifying the range of B, the thickness of the weak point area can be maintained in the manufacturing process, which not only ensures quality control in mass production, but also can improve the stability of the production process.

[0077] In a specific embodiment, the second end surface 242 is not flat, and the second end surface 242 has a second convex surface 2421 at the exposed opening 222 protruding toward the end surface of the unit cell 21, wherein the distance A2 between the second convex surface 2421 and the positive terminal end surface 2111 is greater than or equal to 0.1 mm, or the distance A1 between the second convex surface 2421 and the cap end surface 21111 is greater than or equal to 0.1 mm. By setting the range of A1 and A2, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations.In addition, by clarifying the range of A1 and A2, the thickness of the weak point area can be maintained in the manufacturing process, which not only ensures quality control in mass production, but also can improve the stability of the production process.

[0078] In a specific embodiment, the second end surface 242 is not flat, and the second end surface 242 has a second convex surface 2421 at the exposed opening 222, which protrudes toward the end surface of the unit cell 21. The distance A2 between the second convex surface 2421 and the positive terminal end surface 2111 is greater than or equal to 0.1 mm or less than 2 mm, or the distance A1 between the second convex surface 2421 and the cap end surface 21111 is greater than or equal to 0.1 mm or less than 2 mm. By setting the range of A1 and A2, the thickness of the waterproofing layer in the weak area can be controlled as much as possible while providing effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations.In addition, by clarifying the range of A1 and A2, the thickness of the weak point area can be maintained in the manufacturing process, which not only ensures quality control in mass production, but also can improve the stability of the production process.

[0079] In a specific embodiment, the second end face 242 has a second convex surface 2421 at the exposed opening 222, which protrudes toward the end face of the unit cell 21, wherein the distance between the second convex surface 2421 and the positive terminal end face 2111 is greater than or equal to 0.5 mm and less than 1 mm, or the distance A1 between the second convex surface 2421 and the cap end face 21111 is greater than or equal to 0.5 mm and less than 1.5 mm. By setting the range of A1 and A2, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under the effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations.In addition, by clarifying the range of A1 and A2, the thickness of the weak point area can be maintained in the manufacturing process, which not only ensures quality control in mass production, but also can improve the stability of the production process.

[0080] In a specific embodiment, the second end face 242 has a second convex surface 2421 at the exposed opening 222, which protrudes toward the end face of the unit cell 21, wherein the distance A2 between the second convex surface 2421 and the positive terminal end face 2111 is greater than or equal to 0.3 mm and less than or equal to 0.8 mm, or the distance A1 between the second convex surface 2421 and the cap end face 21111 is greater than or equal to 0.3 mm and less than 1.2 mm. By setting the range of A1 and A2, the thickness of the waterproofing layer in the weak area can be controlled as much as possible under the effective waterproofing protection, thereby providing a clear and controlled safe pressure relief channel for high pressure, high temperature, and other abnormal situations.In addition, by clarifying the range of A1 and A2, the thickness of the weak point area can be maintained in the manufacturing process, which not only ensures quality control in mass production, but also can improve the stability of the production process.

[0081] In a specific embodiment, the water sealing element 24 is a non-metallic material having a thermal softening temperature greater than or equal to 90°C. As in Fig. As shown in Figure 17, the temperature rise of the cell end face of the 60V unit cell 21 during the 30A discharge process is approximately 60°C. As the current increases, the temperature rise of the cell end face also increases. When the cell temperature exceeds abnormal values ​​during the charge and discharge process, a high-voltage and high-temperature fire is normally performed in the region of the first cell end face 211 to protect the unit cell 21. At this time, the temperature of the cell end face is normally above 100°C. Since the water seal member 24 is a non-metallic material with a thermal softening temperature greater than or equal to 90°C, the water seal member 24 may soften spontaneously during the heating process of the abnormal unit cell 21.At this time, the abnormal unit cell 21 can break through the water sealing element in the weak area more quickly, thereby providing a safe pressure relief mechanism to avoid continuous deflagration affecting the adjacent unit cell 21 or the adjacent cell assembly 2. At the same time, in order to achieve a stable and effective waterproof effect, it cannot be affected by temperature during the heating process of the normal unit cell 21.

[0082] In a specific embodiment, the water sealing element 24 is acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polypropylene (PP), polyethylene (PE), nylon, polyamide (PA) and / or glass fibers. By utilizing the water sealing element as any material in acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polypropylene (PP), polyethylene (PE), nylon, polyamide (PA) and / or glass fibers. By utilizing the water sealing element 24 as acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polypropylene (PP), polyethylene (PE), nylon, polyamide (PA) and / or glass fibers. By setting the water sealing member as any material in Acrylonitrile Butadiene Styrene (ABS), Polycarbonate (PC), Polypropylene (PP), Polyethylene (PE), Nylon, Polyamide (PA) and / or Glass fiber, the water sealing member 24 can soften by itself during the heating process of the abnormal unit cell 21.At this time, the abnormal unit cell 21 can break through the water sealing element in the weak area more quickly, thereby providing a safe pressure relief mechanism to avoid continuous deflagration affecting the adjacent unit cell 21 or the adjacent cell assembly 2. At the same time, in order to achieve a stable and effective waterproof effect, it cannot be affected by temperature during the heating process of the normal unit cell 21.

[0083] In a specific embodiment, the water sealing member 24 is a uniform-thickness water sealing plate whose thickness is greater than or equal to 0.3 mm and less than or equal to 3 mm. The water sealing member 24 has a first convex surface 2411 and a second convex surface 2421 at the exposed hole 222, which protrude toward the end face of the unit cell 21. The convex surface 2411 and the second convex surface are formed in the weak region of the exposed hole 222. When the cell experiences abnormal overtemperature, it typically experiences a high-voltage and high-temperature fire in the region of the first cell end face 211.At this time, the abnormal unit cell 21 can quickly break through the water seal plate in the weak area, thereby providing a safe pressure relief mechanism to avoid affecting the adjacent unit cell 21 or the adjacent cell assembly 2, so that continuous deflagration occurs.

[0084] In a specific embodiment, the water sealing member 24 is a water sealing plate with uneven thickness, wherein the thickness of the water sealing member 24 at the exposed hole 222 is less than the thickness of the water sealing member 24 outside the exposed hole 222, and the water sealing member 24 is formed in the weak region of the exposed hole 222. When the cell experiences an abnormal overtemperature, it typically exhibits a high-voltage and high-temperature fire in the region of the first cell end face 211. At this time, the abnormal unit cell 21 can quickly break through the water sealing plate in the weak region, thereby providing a safe pressure relief mechanism to prevent the adjacent unit cell 21 or the adjacent cell assembly 2 from being affected, so that continuous deflagration occurs. Referring to Fig.4 In one embodiment, the water seal member 24 has a positioning member 226, wherein the positioning member 226 is a positioning hole, wherein the positioning post is provided in the cell holder 22, wherein the positioning post has a size of 1 mm-10 mm, which enables effective positioning.

[0085] In a specific embodiment, the water seal member 24 has a positioning member 226, wherein the positioning member 226 is a positioning post, wherein the positioning post has a size of 0.5 mm to 2 mm, wherein the positioning hole is provided in the cell holder 22, wherein the positioning hole can accommodate some or all of the positioning;

[0086] In a particular embodiment, the water seal member 24 forms a limited fit on the cell holder 22. Embodiments include, but are not limited to, snap-together structural connections, welding, adhesive bonding, and other forms of process connection that are not limited to a mortise and tenon structure.

[0087] The pole piece holder 3 has a terminal assembly 32 and a terminal fixing seat 33, the terminal assembly 32 being fitted into the terminal fixing seat 33, the terminal fixing seat 33 defining the terminal assembly 32, the terminal fixing seat 33 being fixedly connected to the control board, the terminal assembly 32 being connected to the control device 4, the terminal fixing seat 33 having an insertion slot 331, the insertion slot 331 serving to guide the correct insertion direction of the tool pole piece to avoid installation errors resulting in a short circuit, and at the same time can stabilize the tool pole piece to ensure that it is effectively connected to the control device 4.The control device 4 is provided on the cell holder 22, the control device 4 having a control board 41 and a connector 42, the control board having at least a control module and a communication module, the control board 41 connecting the unit cell 21 from the exposed hole 222 through the connector 42 to achieve at least the communication and control functions, the control module serving to regulate parameters such as the voltage, the current and the temperature in the battery pack to ensure the safe and efficient operation of the entire system, the communication module serving to exchange data with an external device to realize the monitoring of the operating state of the battery pack.

[0088] It will be understood by those skilled in the art that the embodiments described above are merely exemplary and that numerous modifications in form and design may be made without departing from the spirit or scope of the present application.

Claims

[1] A tool battery pack comprising a housing assembly, a cell assembly, a pole piece holder, a control device, and a water-sealing layer, the housing assembly being for receiving the cell assembly, the pole piece holder, and the control device; the control device being connected to the pole piece holder and the cell assembly; the cell assembly comprising a cell holder and unit cells mounted on the cell holder, the cell holder having a first end and a second end, the second end having an exposed hole, the water-sealing layer being provided on the second end of the cell holder, characterized bythat there is further a water sealing member and a positioning member for connecting the water sealing member to the cell holder, wherein the water sealing member is provided at a second end of the cell holder, wherein the water sealing member has a first end surface remote from the cell holder and a second end surface located near the cell holder, wherein the water sealing layer is at least partially present between the second end surface and the cell holder, wherein the second end surface has a second convex surface at the exposed hole protruding toward the end surface of the unit cell. [2] Tool battery pack according to claim 1, characterized by that the first end face at the exposed hole has a first convex surface projecting toward the end face of the unit cell. [3] Tool battery pack according to claim 2, characterized bythat the distance B between the first convex surface and the second end surface is greater than 0.3 mm and less than or equal to 3 mm. [4] Tool battery pack according to claim 1, characterized by that the unit cell has a first cell end face and a second cell end face, wherein the first cell end face has a positive pole end face, wherein the distance A2 between the second convex surface and the positive pole end face is greater than or equal to 0.1 mm. [5] Tool battery pack according to claim 4, characterized by that the distance A2 between the second convex surface and the positive pole end face is greater than or equal to 0.1 mm and less than 2 mm. [6] Tool battery pack according to claim 4, characterized by that the distance A2 between the second convex surface and the positive pole end face is greater than or equal to 0.3 mm and less than 1.2 mm. [7] Tool battery pack according to claim 4, characterized bythat the positive pole end face has a cap end face, wherein the distance A1 between the second convex surface and the cap end face is greater than or equal to 0.1 mm. [8] Tool battery pack according to claim 7, characterized by that the distance A1 between the second convex surface and the cap end face is greater than or equal to 0.1 mm and less than 2 mm. [9] Tool battery pack according to claim 7, characterized by that the distance A1 between the second convex surface and the cap end face is greater than or equal to 0.5 mm and less than 1.5 mm. [10] Tool battery pack according to claim 7, characterized by that the distance A1 between the second convex surface and the cap end face is greater than or equal to 0.3 mm and less than 1.2 mm. [11] Tool battery pack according to claim 1, characterized bythat the water sealing element is made of non-metallic material with a thermal softening temperature greater than or equal to 90°C. [12] Tool battery pack according to claim 11, characterized by that the water sealing element is any material from Acrylonitrile Butadiene Styrene (ABS), Polycarbonate (PC), Polypropylene (PP), Polyethylene (PE), Nylon, Polyamide (PA) and / or Glass Fibers. [13] Tool battery pack according to claim 1, characterized by that the thickness of the water sealing element is greater than or equal to 0.3 mm and less than 3 mm. [14] Tool battery pack according to claim 13, characterized by that the water sealing element is water sealing plates of uneven thickness, wherein the thickness of the water sealing element at the exposed hole is less than or equal to the thickness of the water sealing element outside the exposed hole. [15] Tool battery pack according to claim 4, characterized byin that the first cell end face further comprises a negative pole end face, wherein there is a separator between the negative pole end face and the positive pole end face, wherein the edge of the negative pole end face near the central axis of the unit cell is the first edge, wherein the exposed hole exposes the first edge, wherein the projection distance C between the first edge and the edge within the exposed hole is greater than or equal to 0.1 mm. [16] Tool battery pack according to claim 1, characterized by that the thickness within the exposed hole is greater than or equal to 0.5 mm and less than or equal to 2.5 mm. [17] Tool battery pack according to claim 16, characterized byin that the cell holder has a receiving slot, the other end of the receiving slot having an exposed hole extending through the cell holder, the area within the exposed hole being smaller than the cross-sectional area of ​​the receiving slot parallel to the exposed hole, the area of ​​the exposed hole being smaller than the maximum area of ​​the first cell end surface extending into the receiving slot. [18] Tool battery pack according to claim 1, characterized by that the waterproofing layer is provided at the second end of the cell holder by any glue filling or vacuum coating process, wherein the waterproofing layer covers the first cell end face and the second cell end face of the unit cell. [19] Tool battery pack according to claim 1, characterized bythat the positioning element is a positioning hole, wherein the cell holder has a positioning post that adapts to the positioning hole, wherein the positioning post has a size of 1 mm-10 mm. [20] Tool battery pack according to claim 1, characterized by in that the positioning element is a positioning post, wherein the positioning post has a size of 0.5 mm to 2 mm, wherein the cell holder has a positioning hole that adapts to the positioning post, wherein the positioning hole can accommodate some or all of the positioning posts.

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