Female terminal structure, battery pack and combination of battery pack and electric tool

Abstract

The utility model relates to a female terminal structure, a battery pack and a combination of the battery pack and an electric tool, the female terminal structure comprises a base part and a main body, a base part supporting leg can be connected with a circuit board, the main body and the base part are integrated, an elastic plate pair is arranged, a clamping part can clamp a male terminal and is in surface contact with the male terminal, the elastic plate pair extends linearly along a moving path, and one end is provided with a first bending part with a specific curvature radius R; the connecting part is folded to form a flaring, auxiliary clamping pieces are arranged on the two sides of the elastic plate pair, the auxiliary clamping pieces can elastically deform to form opposite clamping force when stressed, the flaring ends at the end of the first bent part, the depth H is determined by R, the periphery is defined, the width is gradually decreased inwards along the depth, and the flaring leads to the clamping channel. The female terminal is simple in structure, can solve the problems of small contact area and unstable clamping in the prior art, improves the stability and reliability of connection with the male terminal by optimizing the structural design, and can effectively improve the connection performance in the application of a battery pack and an electric tool.

Description

Technical Field

[0001] This utility model relates to a female terminal structure, a battery pack, and a combination of the battery pack and a power tool. Background Technology

[0002] In the field of power tools, reliable electrical and mechanical connections between the battery pack and the power tool body are crucial. Traditional battery pack connection methods for power tools have many problems.

[0003] From an electrical connection perspective, early male and female terminals mostly used point or line contact, which resulted in poor current transmission stability and was prone to increased resistance and overheating, severely affecting the performance and lifespan of power tools. Moreover, with the increasing frequency of power tool use and the rising power demands, failures caused by this unstable electrical connection method are becoming increasingly frequent.

[0004] In terms of mechanical connections, traditional connection structures often fail to ensure stable clamping between the male and female terminals. When power tools are subjected to vibration or impact during operation, the connection between the battery pack and the tool body can easily loosen, leading to a power outage. This not only affects the work process but may also pose a safety hazard to ongoing operations.

[0005] Therefore, patents CN104900824B, US20230344162A1, and EP3116049B1 provide various structural methods for female terminals to expand the contact area between the device-side terminal (male terminal) and the battery-side terminal. Utility Model Content

[0006] The purpose of this invention is to provide a simple female terminal structure to solve the problems of small contact area and unstable clamping in the prior art.

[0007] This application provides a female terminal structure suitable for electrical and mechanical connection with a male terminal along a moving path, comprising:

[0008] The base has legs suitable for connecting circuit boards;

[0009] The main body, which is integrally connected to the base, includes a pair of elastic plates, the pair of elastic plates including a clamping part adapted to clamp the male terminal and maintain surface contact therewith, the clamping part having a clamping channel;

[0010] Auxiliary clamping components are provided at the base or on the main body;

[0011] The clamping part extends linearly along the direction of the moving path, and its end facing the male terminal has a flared part, which forms a flared opening at the head end of the clamping part.

[0012] The flared portion defines the outer periphery of the female terminal structure, and the width of the flared portion gradually tapers inward along its depth direction and faces the clamping portion to access the clamping channel;

[0013] The auxiliary clamping member is located on the outside of the clamping part, and its clamping position is close to the flare. The auxiliary clamping member is adapted to undergo elastic deformation during the insertion of the male terminal to form opposing clamping forces on both sides of the clamping part.

[0014] Furthermore, the auxiliary clamping element is clamped on the outside of the clamping part.

[0015] Furthermore, the auxiliary clamping element is folded and connected to the end of the flared opening.

[0016] Furthermore, the flared portion is a first curved portion that forms an arc-shaped bend with a specific radius of curvature R. The curved surface of the first curved portion surrounds the flared portion, and the flared portion terminates at the end of the first curved portion. Its flared depth H is determined by the radius of curvature R of the first curved portion.

[0017] Furthermore, the flared portion has an inclined surface, which surrounds the flared portion.

[0018] Furthermore, the flaring depth H is directly proportional to the radius of curvature R of the first curved portion.

[0019] Furthermore, the flaring depth H is equal to the radius of curvature R of the first bend.

[0020] Furthermore, D≦R<2D, where D is the thickness of the elastic plate of the elastic plate pair.

[0021] Furthermore, the clamping depth of the clamping part is not less than the length of the male terminal along the moving path.

[0022] Furthermore, the area of ​​the male terminal held by the clamping part is determined by the length of the male terminal along the moving path.

[0023] Furthermore, the other end of the clamping part bends and extends toward and connects with the connecting arm of the main body, the connecting arm is connected to the base, and the bent and extended part constitutes a second curved part, which is adapted to elastically deform under the action of force to form opposing clamping forces on both sides of the clamping part.

[0024] Furthermore, the auxiliary clamping member and the second curved portion are distributed on both sides of the central axis of the clamping portion.

[0025] Furthermore, the clamping part has an actual clamping area relative to the clamped male terminal.

[0026] Furthermore, the clamping part is set at an angle α with the axis of the linearly extending axis and the axis of the moving path direction, where 0≦α≦2°.

[0027] Compared with the prior art, the beneficial technical effects of the female terminal structure of this utility model application are as follows:

[0028] On the one hand, the clamping part extends linearly, which can maintain surface contact with the male terminal. Compared with point contact or line contact, it greatly increases the contact area. In addition, the auxiliary clamping parts on both sides of the clamping part deform elastically under the action of force, forming opposing clamping forces to ensure that the male terminal is always tightly attached to the clamping part.

[0029] On the other hand, the flared opening serves as the starting guide part of the clamping part. The flared opening can be formed by the curved surface of the first curved part or by two inclined surfaces. When the flared opening is the first curved part, it is formed by the natural extension of the first curved part, reducing additional connecting parts or transition structures. At the same time, its flared opening depth H is determined by the radius of curvature R. This design effectively saves space while realizing the guiding function, so that the flared opening not only guides the insertion of the male terminal, but also takes into account minimizing the area of ​​the male terminal that is not clamped during the insertion process, thereby further increasing the contact area of ​​the male terminal that is clamped.

[0030] Additionally, this application provides a battery pack that can be used as a power source for power tools and can be connected to and detached from the tool body of the power tool, comprising:

[0031] At least one battery cell;

[0032] A housing accommodating at least one battery cell, the housing having a tool engagement portion having a slot adapted for the male terminal to pass through along a movement path; and,

[0033] The female terminal, as described above, is electrically connected to the at least one battery cell;

[0034] When the battery pack is connected to the tool body, the male terminal passes through the slot and inserts into the female terminal so that it is held by the clamping part and forms surface contact with it.

[0035] Furthermore, the flared portion tends to be close to the slot, so that only an installation gap C remains between the end face of the flared portion and the inner side of the slot.

[0036] Furthermore, the installation gap C is less than 2mm.

[0037] In addition, this application also provides a battery pack that can be used as a power source for power tools and can be connected to and detached from the tool body of the power tool, including:

[0038] At least one battery cell;

[0039] A housing accommodating at least one battery cell, the housing having a tool engagement portion having a slot adapted for the male terminal to pass through along a movement path; and,

[0040] A female terminal, which includes a clamping portion adapted to clamp the male terminal and maintain surface contact therewith;

[0041] The clamping portion extends linearly along the direction of the moving path. Its end facing the male terminal forms a first curved portion with a specific radius of curvature R to form a flared opening at the beginning of the clamping portion. The flared opening terminates at the end of the first curved portion. Its flared opening depth H is determined by the radius of curvature R of the first curved portion and defines the outer periphery of the female terminal structure. The width of the flared opening gradually tapers inward along its depth direction and faces the clamping portion to access the clamping channel.

[0042] The first bend tends to approach the slot, such that only an installation gap C remains between the first bend and the inside of the slot.

[0043] Furthermore, the wall surface of the flared opening is formed solely by the curved surface of the first curved portion.

[0044] Furthermore, the flaring depth H is equal to the radius of curvature R of the first bend.

[0045] Furthermore, the area of ​​the male terminal held by the clamping part is determined by the length of the male terminal along the moving path.

[0046] This application provides a combination of a battery pack and a power tool, comprising a battery pack and a power tool adapted to be connected and disconnected from each other, the power tool including a battery mounting portion having a male terminal, and the battery pack as described above.

[0047] The battery pack and the combination of the battery pack and power tool of this utility model application have all the above-mentioned beneficial technical effects, which will not be repeated here. Attached Figure Description

[0048] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0049] Figure 1 : Schematic diagram of the female terminal structure in Embodiment 1 of this utility model;

[0050] Figure 2: A schematic diagram of the structure of the male terminal and female terminal before they come into contact in Embodiment 1 of this utility model;

[0051] Figure 3 : A schematic diagram of the structure in Embodiment 1 of this utility model showing the initial contact between the male and female terminals;

[0052] Figure 4 This utility model Figure 3 Enlarged schematic diagram of a local part of the structure;

[0053] Figure 5 : A schematic diagram of the structure of the male and female terminals clamped together in Embodiment 1 of this utility model;

[0054] Figure 6 : One of the schematic diagrams of the auxiliary clamping member and the second bending part of the fabric structure in Embodiment 1 of this utility model;

[0055] Figure 7 : Schematic diagram of the auxiliary clamping member and the second bending part of the fabric structure in Embodiment 1 of this utility model (II);

[0056] Figure 8 : Another structural schematic diagram of the female terminal structure in Embodiment 1 of this utility model;

[0057] Figure 9 : A schematic diagram of the battery pack structure of a specific embodiment of this utility model;

[0058] Figure 10 : A partial structural diagram of the battery pack according to a specific embodiment of this utility model;

[0059] Figure 11 : A schematic diagram of the mounting structure of the female terminal and the terminal connector in a specific embodiment of this utility model;

[0060] Figure 12 Top view of the mounting structure of the female terminal and the terminal connector in a specific embodiment of this utility model;

[0061] Figure 13 : A partial structural diagram of the mounting of the female terminal and the terminal connector in a specific embodiment of this utility model;

[0062] Figure 14 : A schematic diagram of the battery pack and power tool working together in a specific embodiment of this utility model.

[0063] Figure 15 : Schematic diagram of the female terminal structure in Embodiment 2 of this utility model;

[0064] Figure 16 : A schematic diagram of the structure of the male terminal and female terminal before they come into contact in Embodiment 2 of this utility model;

[0065] Figure 17: A schematic diagram of the structure of the male terminal and female terminal clamped together in Embodiment 2 of this utility model. Detailed Implementation

[0066] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0067] Example 1

[0068] Reference Figure 1 , Figure 2 , Figure 3 , Figure 10 As shown, a female terminal structure 100 is suitable for electrical and mechanical connection with a male terminal 200 along a moving path. It includes a base 1 and a body 2 made of conductive material (such as aluminum, copper, etc.). The base 1 has legs 10 for connecting a circuit board 304. The body 2 is integrally connected to the base 1. Preferably, the body 2 and the base 1 are integrally formed, especially integrally stamped. The body 2 includes an elastic plate pair 20 composed of at least a pair of elastic plates 20a, 20b. The elastic plate pair 20 includes a clamping part 201 suitable for clamping the male terminal 200 and maintaining surface contact with it. The clamping part 201 has a clamping channel S.

[0069] The clamping part 201 extends linearly along the direction of the moving path (as shown by direction arrow B), and its end facing the male terminal 200 has a flared part. The flared part forms a flared opening 203 at the beginning of the clamping part 201. In this embodiment, the flared part has a specific radius of curvature R (e.g., Figure 3 and Figure 4 As shown, a first curved portion 202 is formed, and the portion following the first curved portion 202 extends towards the other end of the clamping portion 201 in a folded shape to form a flared opening 203 at the beginning end of the clamping portion 201. Additionally, an auxiliary clamping member 204 is mounted on the outside of the clamping portion 201. The auxiliary clamping member 204 is disposed on the base 1 or the main body 2. Specifically, the clamping position of the auxiliary clamping member 204 on the outside of the clamping portion 201 is close to the flared opening 203. In some embodiments, the auxiliary clamping member 204 is folded and connected to the end of the flared opening 203. The auxiliary clamping member 204 itself possesses elastic force after deformation. Under the action of force, the auxiliary clamping member 204 elastically deforms to form opposing clamping forces on both sides of the clamping portion 201 (e.g., ...). Figure 5 (As indicated by arrow F); where,

[0070] The flare 203 terminates at the end of the first bend 202. Its flare depth H is determined by the radius of curvature R of the first bend 202, and the end of the first bend 202 defines the outer periphery of the female terminal structure 100. The width of the flare 203 gradually tapers inward along its depth direction and faces the clamping part 201 to reach the clamping channel S.

[0071] Specifically, continue to refer to Figure 1 As shown, the two plates of the clamping part 201 are opposite to each other. In the direction along the moving path (as shown by the direction arrow B), the two plates extend linearly. At the same time, they also extend linearly in the direction perpendicular to the moving path, so that the clamping part 201 can provide a larger contact area when it mates with the male terminal 200, thus achieving a more stable clamping effect.

[0072] Continue to refer to Figure 3 and Figure 4 As shown, it can be clearly observed that the first curved portion 202 exhibits a specific curvature shape, with a radius of curvature of R. Figure 3 and Figure 4 In the diagram, virtual circles O1 and O2 with radius R are used for visual illustration. These two virtual circles O1 and O2 depict the curvature characteristics of the first curved section 202. Continuing to refer to... Figure 3 and Figure 4 It can be clearly observed that the flared end 203 terminates at the end of the first bend 202, and the termination point is at... Figure 3 and Figure 4 The ends A1 and A2 are respectively marked, and the outer periphery or boundary of the female terminal structure 100 is defined at the positions marked by the ends A1 and A2. That is, in the area of ​​the flared opening 203, the positions marked by the ends A1 and A2 are at the outermost or outermost periphery. Thus, the outer periphery of the female terminal structure 100 is at least partially defined by the end of the first curved portion 202. It can be further understood that the outer periphery contour of the female terminal structure 100 is also at least partially formed by the end contour of the first curved portion 202. At this time, from a geometric point of view, the flared opening 203 is defined by the end of the first curved portion 202. The radius of curvature R of the first curved portion 202 determines the size and shape of its arc. Since the flared opening 203 terminates at the end of the first curved portion 202, and the position and shape of this end are related to the radius of curvature R, the flared opening depth H will be affected by the radius of curvature R. That is, the flared opening depth H is determined by the radius of curvature R of the first curved portion 202.

[0073] Specifically, the larger the radius of curvature R of the first curved portion 202, the farther its arc-shaped portion extends in the direction of the moving path. Since the flaring depth H is the distance measured from the end of the first curved portion 202 (i.e., the position determined by the radius of curvature R) to the bottom of the flaring 203 (the side leading to the clamping channel S), the flaring depth H will also increase accordingly when R increases.

[0074] Reference Figure 5 As shown, the dashed line represents the initial state of the female terminal structure 100, that is, when the male terminal 200 is not inserted, the clamping channel is relatively close; the solid line represents the state after the male terminal 200 is inserted, at which time the clamping channel S is expanded to accommodate the male terminal 200.

[0075] Reference Figures 2 to 5 As shown, when the male terminal 200 approaches the female terminal structure 100, it first contacts the flared opening 203. The width of the flared opening gradually tapers inwards along the depth direction to guide the male terminal 200 towards the clamping channel S along the moving path. Thus, in the initial stage of entering the flared opening 203, the male terminal 200 is guided by the wall of the flared opening 203. At this time, the contact force between the male terminal 200 and the wall of the flared opening 203 is relatively small, mainly due to the gradual penetration along the shape of the flared opening 203. As the male terminal 200 continues to penetrate deeper into the flared opening 203, its sides will generate a greater contact force with the wall of the flared opening 203. This force is transmitted to the auxiliary clamping members 204 on both sides of the clamping channel S. The auxiliary clamping members 204 have a certain degree of elasticity and will undergo elastic deformation under the external force applied by the male terminal 200. For example, from... Figures 2 to 5 As can be seen, the auxiliary clamping member 204 is similar to a U-shaped plate with an opening. The thrust of the male terminal 200 will cause it to expand and deform outward, and the clamping channel S will gradually open. Figure 5 The change from the dashed line to the solid line shows that the width of the clamping channel S increases. As the clamping channel S is gradually expanded, the male terminal 200 will continue to move along the moving path into the interior of the clamping channel S. Since the clamping channel S has been expanded, the male terminal 200 can smoothly enter the deeper part of the clamping channel S.

[0076] Therefore, the flaring depth H directly determines the travel distance of the male terminal 200 before entering the clamping channel S. When the flaring depth H is small, the distance traveled by the male terminal 200 from the initial contact with the flaring 203 to its imminent entry into the clamping channel S will be correspondingly smaller. Since a smaller flaring depth H results in a shorter travel distance before contact, this means that the unclamped portion of the male terminal 200 is relatively short before entering the clamping channel S. Consequently, when the male terminal 200 enters the clamping channel S, the area entering the clamping channel S will be relatively larger due to the smaller previously unclamped area. This allows the male terminal 200 to more quickly cause the abutment support portions 204 on both sides of the clamping channel S to elastically deform, further increasing the clamping area based on surface contact clamping.

[0077] In general, the two plates of the clamping part 201 extend linearly in both the direction along the moving path and the direction perpendicular to the moving path. This design allows the male terminal 200 to provide a larger contact area when it mates with the clamping part 201. Compared with the traditional point contact or small area contact terminal structure, the surface contact method can distribute pressure more evenly, reduce local stress concentration, and thus enhance the stability of the connection. Furthermore, according to electrical principles, the larger the contact area, the smaller the contact resistance, which can also reduce problems such as resistance and heat generation, and improve the reliability of the electrical connection.

[0078] The design of the flared end 203 and the elastic deformation characteristics of the auxiliary clamping element 204 allow the male terminal 200 to gradually expand the clamping channel S during insertion, forming opposing clamping forces after insertion. When the flared depth H is small, the area of ​​the male terminal 200 entering the clamping channel S is relatively large. This not only allows the auxiliary clamping element 204 to undergo elastic deformation more quickly, but also further increases the actual clamping area based on surface contact clamping. The combination of a larger clamping area and stable clamping force can more firmly fix the male terminal 200, effectively preventing loosening even under harsh working conditions such as vibration and impact, ensuring the long-term stability and reliability of the connection.

[0079] Furthermore, the width of the flare 203 gradually tapers inward along the depth direction. This shape effectively guides the male terminal 200 to gradually approach the clamping channel S along the moving path. In the initial stage of male terminal 200 insertion, the smaller contact force and the guiding effect of the flare make the insertion process smoother, reducing the inconvenience caused by alignment difficulties or excessive insertion resistance.

[0080] Furthermore, as explained above, the flaring depth H is directly proportional to the radius of curvature R of the first curved portion 202.

[0081] Specifically, from a geometric perspective, the larger the radius of curvature R of the first bend 202, the farther its arcuate portion extends in the direction perpendicular to the movement path. Since the flare depth H is the distance measured from the end of the first bend 202 (the position of which is determined by the radius of curvature R) to the bottom of the flare 203 (the side leading to the clamping channel S), as R increases, the flare depth H also increases accordingly based on this geometric relationship. Thus, a smaller radius of curvature R results in a smaller flare depth H, causing the male terminal 200 to have a smaller unclamped area when entering the flare 203, resulting in a relatively larger area entering the clamping channel S.

[0082] Furthermore, the flare depth H is equal to the radius of curvature R of the first curved portion 202.

[0083] It is understandable that when the flare depth H is equal to the radius of curvature R of the first bend 202, the distance traveled by the male terminal 200 from the initial contact with the flare 203 to its imminent entry into the clamping channel S will be equal to the flare depth H and the radius of curvature R. Thus, the unclamped portion of the male terminal 200 before entering the clamping channel S will be determined by the radius of curvature R. By setting the radius of curvature R, the actual clamping area can be further increased on the basis of surface contact clamping when the male terminal 200 enters the clamping channel S, making the male terminal 200 more securely fixed.

[0084] Specifically, D≦R<2D, where D is the thickness of elastic plates 20a and 20b of elastic plate pair 20.

[0085] From a structural strength perspective, when the radius of curvature R is not less than the thickness of the elastic plates 20a and 20b, it ensures that the first bending portion 202 has sufficient space for arc bending. If it is less than that, it may cause excessive stress concentration in the elastic plates 20a and 20b during bending, or even cause damage such as cracking, affecting the service life and reliability of the female terminal structure 100.

[0086] Considering the guiding function of the flared end 203, a certain radius of curvature R (at least D) can form an effective shape of the flared end 203, so that the male terminal 200 can smoothly contact and be guided into the clamping channel S along the flared end 203. A smaller radius of curvature may not provide enough guiding space, resulting in difficulty in inserting the male terminal 200.

[0087] Regarding elastic deformation, limiting the radius of curvature R to less than 2D is to ensure that the abutment support 204 can effectively undergo elastic deformation when the male terminal 200 is inserted. If R is too large (exceeding 2D), it may cause the flare 203 to be too deep, resulting in an excessively long un-clamped portion of the male terminal 200 after entering the flare 203, thus affecting the actual clamping area.

[0088] Furthermore, the wall surface of the flared end 203 is composed only of the curved surface of the first curved portion 202. Thus, the wall surface of the flared end 203 forms a single curved surface design, which simplifies the design of the female terminal structure 100 and makes it easier to manufacture and process.

[0089] Furthermore, the clamping depth of the clamping part 201 is not less than the length of the male terminal 200 along the moving path. This ensures that after insertion, the front end of the male terminal 200 is completely enveloped by the clamping part 201. The area of ​​the male terminal 200 clamped by the clamping part 201 is determined by the length of the male terminal 200 along the moving path. As long as the length of the male terminal 200 remains stable within the design range, a relatively fixed contact area between the male terminal 200 and the clamping part 201 can be guaranteed for each connection. This helps maintain the stability of the contact resistance, reduces resistance fluctuations caused by changes in the contact area, and thus improves the reliability of the electrical connection.

[0090] Furthermore, referring to Figure 6 , Figure 7 As shown, the other end of the clamping part 201 bends and extends toward the connecting arm 205 of the main body 2 and connects thereto. The connecting arm 205 is connected to the base 1. The bent and extended part constitutes the second bent part 206, which is suitable for elastic deformation under the action of force to form opposing clamping forces on both sides of the clamping part 201.

[0091] The second curved portion 206 provides an additional elastic deformation area for the clamping portion 201. Unlike the auxiliary clamping member 204, the second curved portion 206 is integrally formed with the clamping portion 201, while the auxiliary clamping member 204 is a separate component clamping the outside of the clamping portion 201. The second curved portion 206 can elastically deform under force, and this deformation also helps to form opposing clamping forces on both sides of the clamping portion 201. The coordinated elastic deformation of multiple areas allows the clamping portion 201 to more effectively wrap around the male terminal 200 when it is inserted, enhancing the tightness of the clamping. Furthermore, under harsh conditions such as vibration and impact, the elastic deformation of the second curved portion 206 can act as a buffer. When subjected to external vibration or impact, the second curved portion 206 can absorb some energy and mitigate the impact of external forces on the connection between the male terminal 200 and the clamping portion 201 through its own elastic deformation, effectively preventing the male terminal 200 from loosening and further improving the reliability of the connection between the male terminal 200 and the female terminal structure 100.

[0092] Furthermore, referring to Figure 6As shown, the auxiliary clamping member 204 and the second curved portion 206 are distributed on both sides of the central axis S1 of the clamping portion 201. Thus, when the male terminal 200 is inserted, the auxiliary clamping member 204 first undergoes elastic deformation due to the contact with the male terminal 200, providing initial clamping force and positioning. As the male terminal 200 is further inserted, the second curved portion 206 also begins to undergo elastic deformation, further enhancing the clamping force and ensuring that the male terminal 200 is firmly clamped. After the male terminal 200 is fully inserted into the inner side of the clamping portion 201, the clamping force generated by the auxiliary clamping member 204 and the second curved portion 206 at both ends of the clamping portion 201 makes the clamping portion 201 firmly clamp the outer side of the male terminal 200, so that the male terminal 200 and the clamping portion 201 fit tightly together.

[0093] Furthermore, referring to Figure 7 As shown, the clamping part 201 has an actual clamping area relative to the clamping male terminal 200 (e.g., Figure 7 The black-filled area), the auxiliary clamping member 204 and the second curved part 206 are distributed on both sides of the central axis S2 of the actual clamping area. It can be understood that the actual clamping area (such as the black-filled area) Figure 7 The black-filled area directly affects the electrical contact area and contact quality between the male terminal 200 and the clamping part 201. A larger actual clamping area usually means a larger electrical contact area, which helps to reduce contact resistance, reduce power loss and heat generation.

[0094] When the male terminal 200 is inserted and clamped by the actual clamping area, the auxiliary clamping members 204 on both sides and the second curved portion 206 can provide clamping force and elastic deformation around the actual clamping area, forming a more stable mechanical balance system when providing clamping force. That is, when the male terminal 200 is inserted and clamped, the structures on both sides work together to act on the actual clamping area, making the clamping force more evenly distributed around the male terminal 200.

[0095] Furthermore, the clamping portion 201 has an actual clamping area relative to the clamping male terminal 200, and the protrusion 204a and the second curved portion 206 of the auxiliary clamping member 204 are distributed in the actual clamping area (e.g., Figure 7 On both sides of the central axis S2 (black-filled area), protrusions 204a are adapted to abut against the terminal connector 305. The protrusions 204a of the auxiliary clamping member 204 abut against the terminal connector 305, adding an extra fixing point and support point. When the male terminal 200 is inserted and clamped, the abutment of the protrusions 204a against the terminal connector 305 can provide a stronger mechanical fixing force. During the insertion and operation of the male terminal, the structures on both sides of the central axis S2 can work together to provide uniform clamping force and elastic deformation, ensuring the stable clamping of the male terminal 200 in the actual clamping area.

[0096] In addition, refer to Figure 8 As shown, it is also worth mentioning that the clamping part 201 is set at an angle α to the axis L1 extending linearly along the moving path direction and the axis L2, where 0 ≦ α ≦ 2°. That is, the clamping part 201 can be set parallel to the axis L2 extending linearly along the moving path direction, as described above. Figures 2 to 7 As shown, alternatively, the clamping part 201 can be designed with an angle of no more than 2° between its linearly extending axis L1 and the axis L2 along the moving path direction, such as... Figure 8 As shown. This tiny angle can guide the insertion of the male terminal 200, similar to a tiny guide ramp, making it easier for the male terminal 200 to enter the clamping part 201 in the initial stage of insertion, reducing insertion resistance.

[0097] Overall, the female terminal structure 100 has a linearly extending clamping part 201 that can maintain surface contact with the male terminal 200, which greatly increases the contact area compared to point contact or line contact. In addition, the auxiliary clamping members 204 on both sides of the clamping part 201 are elastically deformed under the action of force to form opposing clamping forces, ensuring that the male terminal 200 is always tightly fitted with the clamping part 201.

[0098] On the other hand, the flared opening 203, as the starting guide portion of the clamping portion 201, is formed by the natural extension of the first curved portion 202, reducing additional connecting parts or transition structures. At the same time, its flared depth H is determined by the radius of curvature R. This design effectively saves space while achieving the guiding function, so that the flared opening 203 not only guides the insertion of the male terminal 200, but also takes into account minimizing the area of ​​the male terminal 200 that is not clamped during the insertion process, thereby further increasing the clamped contact area of ​​the male terminal 200.

[0099] Furthermore, referring to Figures 9 to 13 As shown, this application provides a battery pack 300 that can be used as a power source for a power tool 400 and can be connected to and detached from the tool body 400a of the power tool 400. It includes:

[0100] At least one battery cell;

[0101] A housing 301 that houses at least one battery cell has a tool engagement 302 with a slot 303 for a male terminal 200 to pass through along a movement path; and a female terminal having a female terminal structure 100 as described above and being electrically connected to at least one battery cell.

[0102] When the battery pack is connected to the tool body 400a, the male terminal 200 passes through the slot 303 and is inserted into the female terminal so that it is held by the clamping part 201 and forms a surface contact with it.

[0103] Specifically, refer to Figure 10 As shown, the female terminal structure 100 is disposed in the terminal connector 305 and supported together on the circuit board 304. The support leg 10 of the female terminal structure 100 is electrically connected to the circuit board 304. The terminal connector 305 plays the role of fixing and positioning the female terminal structure 100, ensuring that the position of the female terminal in the battery pack is accurate and stable.

[0104] Continue to refer to Figure 10 and Figure 12 As shown, the female terminal includes positive and negative female terminals and a communication female terminal. Preferably, the positive and negative female terminals have the female terminal structure 100 described above, while the communication female terminal is a conventional terminal structure. It is understood that the connection between the positive and negative terminals directly affects the power transmission capacity of the battery pack and the power output of the power tool. A stable and reliable positive and negative connection ensures that the power tool receives stable voltage and current during operation. Therefore, the positive and negative female terminals have the female terminal structure 100 described above, which has good clamping force and stable surface contact. Communication signals typically have smaller currents and relatively lower requirements for connection reliability; conventional terminal structures can meet the basic requirements of communication functions.

[0105] Continue to refer to Figure 12 As shown, more preferably, the flared end face P1 of the female terminal structure 100 extends beyond the opening face P2 of the terminal connector 305. In this way, the male terminal has a travel distance before contacting the flared end face during the initial insertion stage, and this distance is not clamped. As the insertion goes deeper, it begins to contact the flared end face and gradually enters the clamping part to be clamped. This design reduces the initial travel distance of the male terminal during insertion, and can establish a connection with the female terminal earlier. It can be understood that reducing the initial travel distance can further reduce the area of ​​the unclamped area, and after the male terminal is inserted, it can provide a larger contact area and a more stable positioning.

[0106] Overall, the design of the flared end face P1 of the female terminal structure 100 extending beyond the opening face P2 of the terminal connector 305 reduces the area of ​​the unclamped region and increases the contact area by decreasing the initial travel distance during insertion.

[0107] Furthermore, referring to Figure 13 As shown, the first curved portion 202 (flared portion) tends to approach the slot 303, so that only the installation gap C is left between the first curved portion 202 and the inner side of the slot 303, that is, only the installation gap C is left between the flared end face P1 formed by the first curved portion 202 and the inner wall surface P3 of the slot 303.

[0108] The first curved portion 202 (flared portion) tends to be close to the slot 303. This optimizes the insertion path of the male terminal 200. When the male terminal 200 is inserted along the slot 303, its proximity to the first curved portion 202 makes it easier for the male terminal 200 to enter the path guided by the first curved portion 202, thus facilitating its entry into the clamping portion 201 of the female terminal. This guiding effect reduces deviation and resistance during male terminal insertion, improving the convenience and accuracy of insertion and removal. Furthermore, because the first curved portion 202 is close to the slot 303, the male terminal 200 can contact the first curved portion 202 more quickly and enter the clamping portion 201, thereby reducing the travel distance of the male terminal in the unclamped state during the initial insertion phase. This reduces the area of ​​the unclamped region and increases the contact area.

[0109] Specifically, and preferably, the installation gap C is controlled within the range of less than 2mm.

[0110] Furthermore, in conjunction with the female terminal structure 100 and the power tool battery pack 300 described above, this application can also provide a power tool battery pack 300 that can be used as a power source for the power tool 400 and can be connected to and detached from the tool body 400a of the power tool 400, comprising:

[0111] At least one battery cell;

[0112] A housing 301 accommodating at least one battery cell, the housing 301 having a tool engagement portion 302, the tool engagement portion 302 having a slot 303 suitable for the male terminal 200 to pass through along a movement path; and,

[0113] The female terminal includes a clamping portion 201 adapted to clamp the male terminal 200 and maintain surface contact therewith;

[0114] The clamping part 201 extends linearly along the direction of the moving path. At the end facing the male terminal 200, a first curved part 202 (forming a flared part) is formed with a specific radius of curvature R. A flared part 203 is formed at the beginning of the clamping part 201. The flared part 203 terminates at the end of the first curved part 202. Its flared depth H is determined by the radius of curvature R of the first curved part 202 and defines the outer periphery of the female terminal structure 100. The width of the flared part 203 gradually tapers inward along its depth direction and faces the clamping part 201 to reach the clamping channel.

[0115] The first bend 202 tends to approach the slot 303, so that only an installation gap C remains between the first bend 202 and the inner side of the slot 303.

[0116] Furthermore, the wall surface of the flared opening 203 is composed solely of the curved surface of the first curved portion 202.

[0117] Furthermore, the flare depth H is equal to the radius of curvature R of the first curved portion 202.

[0118] Furthermore, the area of ​​the male terminal 200 held by the clamping part 201 is determined by the length of the male terminal 200 along the moving path.

[0119] Reference Figure 14 As shown, this application also relates to a combination of a battery pack 300 and a power tool 400, which includes a battery pack and a power tool 400 adapted to be connected and disconnected from each other. The power tool 400 includes a battery mounting portion having a male terminal 200, wherein the battery pack is as described above.

[0120] Example 2

[0121] Reference Figures 15 to 17 Based on the same technical concept, this application provides a female terminal structure 100. The difference between this embodiment and Embodiment 1 is that the main body 2 of the female terminal structure 100 is composed of a pair of interconnected elastic plates 20a and 20b. The elastic plates 20a and 20b form an elastic plate pair 20. The flared portion of the elastic plate pair 20 has an inclined surface 203a, which forms a flared opening 203. The inner wall of the flared opening 203 is a smooth inclined surface 203a. When the male terminal 200 initially enters the flared opening 203, it is guided by the wall of the flared opening 203. The depth H of the flared opening 203 is related to the inclination angle of the inclined surface 203a, so that the clamping part 201... The inner surface serves as the reference surface. The greater the angle of inclination of the inclined surface 203a relative to the reference surface, the smaller the flare depth H. Conversely, the smaller the angle of inclination of the inclined surface 203a relative to the reference surface, the greater the flare depth H. The flare depth H directly determines the travel distance of the male terminal 200 before entering the clamping channel S. When the flare depth H is small, the distance traveled by the male terminal 200 from initial contact with the flare 203 to its imminent entry into the clamping channel S will be correspondingly smaller. Since a smaller flare depth H results in a shorter travel distance before contact, it means that the unclamped portion of the male terminal 200 is relatively short before entering the clamping channel S. Consequently, when the male terminal 200 enters the clamping channel S, the area entering the clamping channel S will be relatively larger due to the smaller previously unclamped area. This allows the male terminal 200 to more quickly cause elastic deformation of the abutment support portions 204 on both sides of the clamping channel S, further increasing the clamping area based on surface contact clamping.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A female terminal structure, suitable for electrical and mechanical connection with a male terminal along a moving path, characterized in that, include: The base has legs suitable for connecting circuit boards; The main body, which is integrally connected to the base, includes a pair of elastic plates, the pair of elastic plates including a clamping part adapted to clamp the male terminal and maintain surface contact therewith, the clamping part having a clamping channel; An auxiliary clamping element is disposed at the base or on the main body; The clamping part extends linearly along the direction of the moving path, and its end facing the male terminal has a flared part, which forms a flared opening at the head end of the clamping part. The flared portion defines the outer periphery of the female terminal structure, and the width of the flared portion gradually tapers inward along its depth direction and faces the clamping portion to access the clamping channel; The auxiliary clamping member is located on the outside of the clamping part, and its clamping position is close to the flared opening. The auxiliary clamping member is adapted to undergo elastic deformation during the insertion of the male terminal to form opposing clamping forces on both sides of the clamping part.

2. The female terminal structure according to claim 1, characterized in that: The auxiliary clamping element is held on the outside of the clamping part.

3. The female terminal structure according to claim 1, characterized in that: The auxiliary clamping element is folded and connected to the end of the flared opening.

4. The female terminal structure according to claim 1, characterized in that: The flared portion has an inclined surface, which surrounds the flared portion.

5. The female terminal structure according to claim 1, characterized in that: The clamping depth of the clamping part is not less than the length of the male terminal along the moving path.

6. The female terminal structure according to claim 1, characterized in that: The area of ​​the male terminal held by the clamping part is determined by the length of the male terminal along the moving path.

7. The female terminal structure according to claim 1, characterized in that: The other end of the clamping part bends and extends toward and connects with the connecting arm of the main body. The connecting arm is connected to the base. The bent and extended part constitutes a second curved part, which is adapted to elastically deform under the action of force to form opposing clamping forces on both sides of the clamping part.

8. The female terminal structure according to any one of claims 1 to 7, characterized in that: The clamping part is set at an angle α with the axis of the linearly extending part and the axis of the moving path direction, where 0≦α≦2°.

9. A battery pack, which can be used as a power source for a power tool and can be connected to and detached from the tool body of the power tool, characterized in that, include: At least one battery cell; A housing for accommodating at least one battery cell, the housing having a tool engagement portion having a slot adapted for the male terminal to pass through along a movement path; as well as, A female terminal, as described in any one of claims 1 to 8, and electrically connected to the at least one battery cell; When the battery pack is connected to the tool body, the male terminal passes through the slot and inserts into the female terminal so that it is held by the clamping part and forms surface contact with it.

10. A combination of a battery pack and a power tool, comprising a battery pack and a power tool adapted for interconnection and disconnection, the power tool including a battery mounting portion having a male terminal, characterized in that: The battery pack is as described in claim 9 above.

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