Terminal structure, battery cover plate and battery

Abstract

The utility model relates to the technical field of power batteries, in particular to a terminal structure, a battery cover plate and a battery, the terminal structure comprises a substrate, a second pole and a first pole, and the substrate is provided with a lead-out hole; one end of the second pole extends out of the lead-out hole; the first pole is connected with the other end of the second pole; the other end of the second pole is provided with a second pole flange extending along the radial direction of the lead-out hole; the substrate first step is positioned on one side, deviating from the first pole, of the second pole flange; taking a projection plane perpendicular to the axial direction of the lead-out hole, recording the projection of the second pole flange on the projection plane as a, and recording the projection of the first step of the substrate on the projection plane as b; and the all / partial projection a is overlapped with the all / partial projection b. According to the utility model, the first step of the substrate is used for blocking and limiting the second pole flange arranged on the second pole. The combination surface of the second pole and the first pole is not cracked or separated, so that the second pole can be prevented from being separated from the first pole, and the connection stability of the second pole and the first pole is improved.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, specifically to a terminal structure, a battery cover, and a battery. Background Technology

[0002] like Figure 5 As shown, in current composite terminal cover designs, a terminal (commonly made of aluminum) extending from the substrate with a lead-out hole is connected to another terminal (commonly made of copper). The substrate with the lead-out hole can block the terminal (commonly made of copper) that does not extend from the lead-out hole. The terminal (commonly made of aluminum) extending from the lead-out hole is not blocked by other components.

[0003] Such prior art can also be found in Chinese invention patent CN119253164A, entitled "Standard Terminal, Cover Plate and Secondary Battery," in which the terminal includes an upper end and a lower end, wherein from Figure 6 As can be seen, the upper end extends out through the outlet hole and is not blocked by other parts.

[0004] When a short-circuit test is performed on this type of composite terminal made of two connected poles, the bonding force at the joint surface of the two poles weakens due to the increase in temperature. In addition, since the plastic insulating board, sealing ring and other parts are in a compressed state after assembly, these parts exert an elastic force on the pole protruding from the lead hole away from the other pole. As the temperature continues to rise, the bonding force is insufficient to resist the elastic force, causing cracks at the joint surface of the two poles. At this time, the pole protruding from the lead hole (commonly made of aluminum) is easy to detach from the lead hole. Utility Model Content

[0005] To address the problem that existing composite terminals are prone to detachment during short-circuit testing due to temperature rise, the purpose of this invention is to provide a terminal structure, a battery cover, and a battery.

[0006] The technical solution provided by this utility model is as follows:

[0007] In a first aspect, a terminal structure includes a substrate, a second terminal post, and a first terminal post. The substrate has a lead-out hole; one end of the second terminal post extends out of the lead-out hole; the first terminal post is connected to the other end of the second terminal post; the other end of the second terminal post has a second terminal post flange extending radially along the lead-out hole; the substrate has a substrate first step; the substrate first step is located on the side of the second terminal post flange facing away from the first terminal post; a projection plane perpendicular to the axial direction of the lead-out hole is taken, the projection of the second terminal post flange on the projection plane is denoted as a, and the projection of the substrate first step on the projection plane is denoted as b; all / partial projection a and all / partial projection b coincide.

[0008] By setting the substrate first step on the substrate, the second pole post flange can be blocked and limited by the substrate first step, so as to avoid the second pole post from being separated from the first pole post, and improve the stability of the connection between the second pole post and the first pole post.

[0009] As an optional technical solution of the first aspect, the first pole post is provided with a first pole post flange extending radially along the lead-out hole; the substrate is further provided with a substrate second step; a projection plane perpendicular to the axis of the lead-out hole is taken, the projection of the first pole post flange on the projection plane is recorded as c, and the projection of the substrate second step on the projection plane is recorded as d; all / part of the projection c coincides with all / part of the projection d.

[0010] The orifice of the substrate lead-out hole is provided with the substrate second step and the substrate first step, and the double-step design can block and limit the first pole post and the second pole post respectively, so as to avoid the first pole post and the second pole post from falling off at the substrate lead-out hole, and improve the stability of the composite terminal structure formed by the two pole posts.

[0011] Optionally, a sealing ring is installed between the substrate first step and the second pole post flange, and between the substrate second step and the first pole post flange; and a space for the radial extension of the sealing ring is arranged between the substrate first step and the second pole post flange, and between the substrate second step and the first pole post flange.

[0012] Two sealing rings are installed at each step in the two-step mode, the two sealing rings are connected by a thin rubber film, the two sealing rings form a whole, and the sealing effect can be improved. In addition, a space for the radial extension of the sealing ring is arranged, when the temperature of the battery rises and the sealing ring and other parts are deformed, the space can provide a space for the thermal deformation of the sealing ring and other parts, reduce the force acting on the substrate, plastic insulation and plastic sealing, and avoid the deformation of the substrate, plastic insulation and plastic sealing, which reduces the extrusion effect on the first pole post and the second pole post.

[0013] Optionally, an axial limiting piece is installed between the substrate second step and the first pole post flange; the axial limiting piece is used to limit the displacement of the first pole post along the axis of the lead-out hole. By the axial limiting piece, the first pole post can be prevented from loosening, so as to ensure that the first pole post and the second pole post can be firmly combined.

[0014] Further, a first radial limiting piece is installed between the second pole post and the substrate first step, and the first radial limiting piece is used to limit the displacement of the second pole post along the radial direction of the lead-out hole; a second radial limiting piece is installed between the first pole post and the substrate, and the second radial limiting piece is used to limit the displacement of the first pole post along the radial direction of the lead-out hole. By the first and second radial limiting pieces, the first pole post and the second pole post do not have radial positions, and the combination surface of the first pole post and the second pole post can be prevented from cracking due to the radial displacement of the two.

[0015] Further, the plastic stopper is arranged below the base plate; the plastic stopper is provided with a plastic stopper second flange, and the plastic stopper first flange is connected to the plastic stopper second flange; wherein the plastic stopper second flange serves as the second radial limiting piece; and the plastic stopper first flange serves as the axial limiting piece.

[0016] Further, the plastic insulating piece is arranged above the base plate; the plastic insulating piece first flange is arranged at the lower end of the plastic insulating piece, and the plastic insulating piece second flange is arranged at the upper end of the plastic insulating piece; wherein the plastic insulating piece first flange forms the first radial limiting piece; and the plastic insulating piece second flange and the second pole post form an installation space, and the metal ring is installed in the installation space; further comprising a plastic sealing piece arranged above the base plate and covering the plastic insulating piece and the metal ring.

[0017] By machining the plastic insulating piece first flange on the plastic insulating piece as the first radial limiting piece, and machining the plastic stopper first and second flanges on the plastic stopper as the axial limiting piece and the second radial limiting piece, the number of parts of the terminal structure is controlled without the need for additional parts.

[0018] As an optional technical solution of the first aspect, the lower end surface of the second pole post flange is flush with the lower end surface of the second pole post and is attached to the upper end surface of the first pole post. At this time, the combined area of the second pole post and the first pole post is increased, which helps to increase the bonding force of the first pole post and the second pole post and improve the strength of the composite terminal connection structure.

[0019] Secondly, a battery cover plate comprises the terminal structure in the first aspect or any one of the optional technical solutions of the first aspect.

[0020] Thirdly, a battery comprises the battery cover plate in the second aspect.

[0021] Compared with the prior art, the technical scheme has the following beneficial effects:

[0022] The base plate first step is arranged to extrude the sealing ring, and the second pole post flange arranged on the second pole post forms a blocking and limiting effect. In addition, the base plate second step is arranged to extrude the sealing ring, and the first pole post flange arranged on the first pole post forms a blocking and limiting effect. When the temperature rises, the first pole post and the second pole post are always limited, and the bonding surface of the two will not crack and separate, which can also prevent the second pole post from being separated from the first pole post, thereby improving the stability of the connection between the second pole post and the first pole post. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A schematic view of a terminal structure in an embodiment of the present application;

[0024] Figure 2 A schematic view of a plastic insulation piece in an embodiment of the present application; Figure 1 An enlarged view at A in the middle;

[0025] Figure 3 A schematic view of a plastic insulation piece in an embodiment of the present application;

[0026] Figure 4 A schematic view of a plastic insulation piece in an embodiment of the present application;

[0027] Figure 5 A schematic view of a terminal structure in the prior art;

[0028] Figure 6 A schematic view of another terminal structure in the prior art.

[0029] Explanation of reference numerals in the schematic views:

[0030] First pole 101, first pole flange 101-1, second pole 102, second pole flange 102-1, plastic stopper 103, plastic stopper first flange 103-1, plastic stopper second flange 103-2;

[0031] Plastic seal 201, metal ring 202, plastic insulation piece 203, plastic insulation piece first flange 203-1, plastic insulation piece second flange 203-2;

[0032] Substrate 301, substrate first step 301-1, substrate second step 301-2, first rubber seal 302, second rubber seal 303. DETAILED DESCRIPTION

[0033] To further understand the content of the present application, the present application is described in detail in conjunction with the drawings and embodiments.

[0034] The structures, proportions, sizes, etc. shown in the drawings of the present specification are merely used to cooperate with the content disclosed in the present specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, and therefore do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like used in the present specification are merely for the convenience of clear description, and are not used to limit the scope of implementation. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation scope of the present application.

[0035] In one embodiment, as shown in Figures 1-4 A terminal structure includes a substrate 301, a second pole 102, and a first pole 101, wherein the first pole 101 and the second pole 102 are connected, and the second pole 102 and the first pole 101 form a composite terminal after being connected. In one battery, two composite terminals can be used as the positive and negative poles of the battery, respectively.

[0036] The substrate 301 is provided with a lead-out hole, and the cross-sectional shape of the lead-out hole is determined according to the shape of the composite terminal. For example, if the cross section of the pole is commonly circular, the lead-out hole is a circular hole. In the assembled state, the upper part of the second pole 102 protrudes out of the lead-out hole (shown as above the substrate in the figure), thereby serving as a current output / input terminal. The lower part of the second pole 102 is located below the substrate, and in addition, the first pole 101 is also located below the substrate.

[0037] Commonly, the first pole 101 can be made of copper, and the second pole 102 can be made of aluminum. Of course, the first pole 101 and the second pole 102 are not limited to being made of the above-mentioned materials, and other materials capable of being used to make composite terminals in the prior art are also applicable to the present application. The technical solution of the present application is not to describe the material of the pole, and will not be repeated and limited here.

[0038] In the scheme proposed in this embodiment, one end (the upper end shown in the figure) of the second pole 102 protrudes out of the lead-out hole, and the other end (the lower end shown in the figure) of the second pole 102 is provided with a second pole flange 102-1 extending radially along the diameter of the lead-out hole, which can be in the form of a circular ring.

[0039] The substrate 301 is provided with a substrate first step 301-1, which can be machined at the hole end of the lead-out hole. In the assembled state, the substrate first step 301-1 is located on the side of the second pole flange 102-1 away from the first pole 101 (shown as above the second pole flange in the figure).

[0040] In order to enable the substrate first step 301-1 to form a blocking and limiting effect, the size of the substrate first step 301-1 and the second pole flange 102-1 needs to meet the following conditions:

[0041] Taking a projection plane perpendicular to the axial direction of the lead-out hole, the projection of the second pole flange 102-1 on the projection plane is denoted as a, and the projection of the substrate first step 301-1 on the projection plane is denoted as b. Wherein, the entire / partial projection a coincides with the entire / partial projection b. That is, the entire projection a can coincide with the partial projection b, the entire projection a can coincide with the entire projection b, the partial projection a can coincide with the partial projection b, or the partial projection a can coincide with the entire projection b.

[0042] It can be understood that the outer diameter of the second pole post flange 102-1 is greater than the inner diameter of the lead-out hole, and at this time the substrate first step 301-1 can limit the upward movement of the second pole post 102 through the lead-out hole. Under the limiting action of the substrate first step 301-1, the second pole post 102 cannot fall off from above the lead-out hole, so that during the short circuit test of the composite terminal, the substrate first step 301-1 can always press the second pole post flange 102-1, and the second pole post 102 is always in contact with the first pole post 101, which can avoid the separation of the two pole posts due to the cracking of the joint surface of the second pole post 102 and the first pole post 101, and the second pole post 102 falling off from the lead-out hole.

[0043] As an optional embodiment, the first pole post 101 is provided with a first pole post flange 101-1 extending radially along the lead-out hole, and the substrate 301 is also provided with a substrate second step 301-2. In order to facilitate processing, the substrate second step 301-2 can also be processed at the hole end of the lead-out hole. As shown in Figure 2 , the substrate second step 301-2 and the substrate first step 301-1 can be formed by one-time stamping forming at the hole end of the lead-out hole, and the substrate first step 301-1 is close to the center of the lead-out hole. The substrate second step 301-2 is connected with the substrate first step 301-1 and connected with the substrate 301 body.

[0044] In order to be able to limit the first pole post 101, the size of the substrate second step 301-2 and the first pole post 101 should satisfy the following conditions: taking a projection plane perpendicular to the axis direction of the lead-out hole, the projection of the first pole post flange 101-1 on the projection plane is recorded as c, and the projection of the substrate second step 301-2 on the projection plane is recorded as d. Wherein, all / part of the projection c coincides with all / part of the projection d. That is, it can be that all the projection c coincides with part of the projection d, it can be that all the projection c coincides with all the projection d, it can be that part of the projection c coincides with part of the projection d, and it can be that part of the projection c coincides with all the projection d.

[0045] By providing the first pole post flange 101-1 on the first pole post 101, not only can the substrate 301 limit the first pole post 101, avoiding displacement of the first pole post 101 in the axial direction of the lead-out hole, but also can realize that the joint surface of the first pole post 101 and the second pole post 102 exists a certain distance from the lower end surface of the first pole post 101, so as to ensure that the electrolyte cannot contact the joint surface of the first pole post 101 and the second pole post 102, thereby avoiding electrochemical corrosion.

[0046] A sealing ring is installed between the substrate first step 301-1 and the second pole post flange 102-1, and between the substrate second step 301-2 and the first pole post flange 101-1. During assembly, the substrate first step 301-1 and the substrate second step 301-2 extrude the sealing ring, and the sealing ring can play a sealing role.

[0047] As an optional solution, a thin film is connected between the first rubber sealing ring 302 and the second rubber sealing ring 303, that is, the two sealing rings form an integral whole, and the sealing effect is better at this time.

[0048] Spaces for radial extension of the sealing rings are provided between the first step 301-1 of the substrate and the flange 102-1 of the second pole, and between the second step 301-2 of the substrate and the flange 101-1 of the first pole. When the temperature rises and the sealing ring and other parts are deformed by heat, the provided spaces can provide a space for thermal deformation of the sealing ring and other parts, reduce the force on the substrate, the plastic insulating part, and the plastic sealing part, and avoid deformation of the substrate, the plastic insulating part, and the plastic sealing part, which reduces the extrusion effect on the first pole and the second pole.

[0049] In an embodiment, an axial limiting part is also installed between the second step 301-2 of the substrate and the flange 101-1 of the first pole. At this time, not only is a sealing ring provided between the second step 301-2 of the substrate and the flange 101-1 of the first pole, but the axial limiting part also limits the axial displacement of the first pole 101, so that the first pole 101 can be prevented from loosening, thereby ensuring that the first pole 101 and the second pole 102 can be firmly combined. It should be noted that when the second rubber sealing ring 303 is not extruded, the upper end surface of the second rubber sealing ring 303 should be higher than the upper end surface of the axial limiting part, so that in the assembled state, the second step 301-2 of the substrate can extrude the second rubber sealing ring 303.

[0050] Optionally, a first radial limiting part is installed between the second pole 102 and the first step 301-1 of the substrate, and the first radial limiting part can limit the radial displacement of the second pole 102 along the lead-out hole. A second radial limiting part is installed between the first pole 101 and the substrate 301, and the second radial limiting part can limit the radial displacement of the first pole 101 along the lead-out hole. When the first pole 101 and the second pole 102 cannot displace radially along the lead-out hole, the combination surface of the two can be firmly combined to avoid cracking at the combination.

[0051] As an optional embodiment, the terminal structure further includes a plastic stopper 103 and a plastic insulating part 203. The plastic insulating part 203 is arranged above the substrate 301, and the plastic stopper 103 is arranged below the substrate 301.

[0052] As shown in FIG. 1, the terminal structure includes a substrate 301, a first pole 101, a second pole 102, a plastic stopper 103, a plastic insulating part 203, a first rubber sealing ring 302, and a second rubber sealing ring 303. Figure 4As shown, the plastic stopper 103 is provided with a plastic stopper second flange 103-2, and the plastic stopper first flange 103-1 is connected to the plastic stopper second flange 103-2. The plastic stopper second flange 103-2 and the plastic stopper first flange 103-1 can be integrally formed with the plastic stopper 103 body. The plastic stopper second flange 103-2 is used as the second radial limiting piece, and the plastic stopper first flange 103-1 is used as the axial limiting piece.

[0053] As shown, the plastic insulation piece 203 is provided with a plastic insulation piece first flange 203-1 at the lower end, and a plastic insulation piece second flange 203-2 at the upper end. The plastic insulation piece first flange 203-1 and the plastic insulation piece second flange 203-2 can be integrally formed with the plastic insulation piece 203 body. The plastic insulation piece first flange 203-1 is used to form the first radial limiting piece. Figure 3

[0054] By machining the plastic insulation piece first flange 203-1 on the plastic insulation piece 203 as the first radial limiting piece, and machining the plastic stopper first and second flanges on the plastic stopper 103 as the axial limiting piece and the second radial limiting piece, the terminal structure does not need to additionally add other parts as the axial and radial limiting pieces, and the number of parts of the terminal structure can be controlled to not increase.

[0055] The plastic insulation piece second flange 203-2 and the second pole 102 form a mounting space, and the metal ring 202 is mounted in the mounting space. When the terminal is assembled by riveting process, the second pole 102 overflows on the metal ring 202, and the metal ring 202 and the plastic insulation piece 203 can play a supporting role.

[0056] The terminal structure further includes a plastic sealing piece 201 arranged above the substrate (301). The plastic sealing piece 201 covers the plastic insulation piece 203 and the metal ring 202 to form a protective effect.

[0057] As an optional embodiment, the lower end surface of the second pole flange 102-1 is flush with the lower end surface of the second pole 102, and is attached to the upper end surface of the first pole 101. At this time, the bonding area of the second pole 102 and the first pole 101 can be improved, thereby helping to improve the bonding force of the first pole 101 and the second pole 102, and improving the strength of the composite terminal connection structure.

[0058] In an embodiment, the application also provides a battery cover plate, which is provided with two terminal structures in the above-mentioned embodiments, one of which is used as a negative pole and the other of which is used as a positive pole.

[0059] ​In one embodiment, the application also provides a battery, comprising a battery cell, a shell and the battery cover plate.

[0060] The above description of the utility model and its embodiments is illustrative and not limiting, and the embodiments shown in the drawings are only one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments are not creatively designed, which should all belong to the protection scope of the utility model.

Claims

1. A terminal structure, comprising: A substrate (301) having lead-out holes; The second pole post (102) has one end extending out of the lead-out hole; The first pole (101) is connected to the other end of the second pole (102); Its features are: The other end of the second pole post (102) is provided with a second pole post flange (102-1) extending radially along the lead-out hole; The substrate (301) is provided with a first step (301-1); the first step (301-1) is located on the side of the second pole flange (102-1) away from the first pole (101); Take a projection plane perpendicular to the axis of the lead-out hole. The projection of the second pole flange (102-1) on the projection plane is denoted as a, and the projection of the first step (301-1) of the substrate on the projection plane is denoted as b. The full / partial projection a coincides with the full / partial projection b.

2. The terminal structure according to claim 1, characterized in that: The first pole post (101) is provided with a first pole post flange (101-1) extending radially along the lead-out hole; The substrate (301) is further provided with a second step (301-2); Take a projection plane perpendicular to the axis of the lead-out hole. The projection of the first pole flange (101-1) on the projection plane is denoted as c, and the projection of the second step (301-2) of the substrate on the projection plane is denoted as d. The full / partial projection c coincides with the full / partial projection d.

3. The terminal structure according to claim 2, characterized in that: Sealing rings are installed between the first step (301-1) and the second pole flange (102-1) of the substrate, and between the second step (301-2) and the first pole flange (101-1) of the substrate. Furthermore, a space is provided between the first step (301-1) of the substrate and the second pole flange (102-1), and between the second step (301-2) of the substrate and the first pole flange (101-1) to accommodate the sealing ring extending radially along the lead-out hole.

4. The terminal structure according to claim 2, characterized in that: An axial limiting component is also installed between the second step (301-2) of the substrate and the first pole flange (101-1); The axial limiting component is used to limit the displacement of the first pole post (101) along the axial direction of the lead-out hole.

5. The terminal structure according to claim 4, characterized in that: A first radial limiting member is installed between the second pole post (102) and the first step (301-1) of the substrate. The first radial limiting member is used to limit the second pole post (102) from moving radially along the lead-out hole. A second radial limiting member is installed between the first pole post (101) and the substrate (301). The second radial limiting member is used to limit the first pole post (101) from moving radially along the lead-out hole.

6. The terminal structure according to claim 5, characterized in that: It also includes a plastic stop (103); the plastic stop (103) is disposed below the substrate (301); The plastic stopper (103) is provided with a plastic stopper second flange (103-2) connected with a plastic stopper first flange (103-1); Wherein, The plastic stopper second flange (103-2) serves as the second radial limiting piece; The plastic stopper first flange (103-1) serves as the axial limiting piece.

7. The terminal structure according to claim 5, characterized in that: Further comprising a plastic insulation piece (203) arranged above the substrate (301); The plastic insulation piece (203) is provided with a plastic insulation piece first flange (203-1) at the lower end and a plastic insulation piece second flange (203-2) at the upper end; Wherein, The plastic insulation piece first flange (203-1) serves as the first radial limiting piece; The plastic insulation piece second flange (203-2) and the second pole post (102) form a mounting space, and the metal ring (202) is mounted in the mounting space; Further comprising a plastic sealing piece (201) arranged above the substrate (301) and covering the plastic insulation piece (203) and the metal ring (202).

8. The terminal structure according to any one of claims 1-7, characterized in that: The lower end surface of the second pole post flange (102-1) is flush with the lower end surface of the second pole post (102) and is attached to the upper end surface of the first pole post (101).

9. A battery cover plate characterized by: The terminal structure according to any one of claims 1-8.

10. A battery, characterized by: The battery cover plate according to claim 9. The battery cover plate according to claim 9.

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