Stop frame and lithium battery using same

Abstract

The stop frame comprises a body, a protrusion is arranged on the body, the protrusion abuts against a roll core and is opposite to an anti-explosion valve on the lithium battery, the face, away from the body, of the protrusion is provided with a first bottom face and a second bottom face, and the first bottom face and the second bottom face are opposite to each other. The distance between the first bottom surface and the body is larger than that between the second bottom surface and the body, the first bottom surface is in contact with the roll core, and the second bottom surface is not in contact with the roll core, so that the contact area between the bulge and the roll core is reduced, and the abrasion of the roll core is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary battery related parts, in particular to a stop frame and a lithium battery using the same. Background Art

[0002] There is a stop frame inside the square lithium battery, and its main function is to ensure the insulation of the battery core (stacked core) and the battery shell, and to press the core (stacked core) to fix it. Generally, the stop frame is designed with a protruding structure corresponding to the explosion-proof valve area. The protrusion has a large contact area with the core (stacked core), a wear area of ​​the core (or stacked core), and occupies a large space. As disclosed in the Chinese patent with publication number: CN214505620U and the name "A Square Battery Stop Frame", the back of the stop frame corresponding to the middle concave part on the upper surface of the stop frame is a protruding part, and the bottom surface of the protruding part conflicts with the core, thereby increasing the wear on the core. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model provides a stop frame and a lithium battery using the same.

[0004] The utility model proposes a stop frame, including a main body, on which a protrusion is provided, the protrusion is in contact with a winding core, and the protrusion is opposite to the explosion-proof valve on the lithium battery, and the side of the protrusion away from the main body has a first bottom surface and a second bottom surface, the distance from the first bottom surface to the main body is greater than the distance from the second bottom surface to the main body, the first bottom surface is in contact with the winding core, and the second bottom surface is not in contact with the winding core, thereby reducing the contact area between the protrusion and the winding core and reducing the wear of the winding core.

[0005] A person skilled in the art may construct a first bottom surface and a second bottom surface with a height difference by grooving the bottom surface of the protrusion or by other means. Specifically, in some embodiments, the protrusion includes a middle protrusion and a side protrusion provided on the main body, the side protrusion is located on the side of the middle protrusion, the bottom surface of the middle protrusion is the first bottom surface, and the bottom surface of the side protrusion is the second bottom surface.

[0006] Since the protrusion is opposite to the explosion-proof valve of the battery, in order to achieve better explosion-proof performance, preferably, a vertical middle through hole is opened on the middle protrusion, a side through hole is provided on the side protrusion, and a ventilation structure for connecting the middle through hole and the side through hole is provided on the middle protrusion.

[0007] Preferably, the side protrusions are provided in two groups, the two groups of side protrusions are distributed along the length direction of the body and the middle protrusion is located between the two groups of side protrusions.

[0008] Optionally, the middle protrusion is rectangular.

[0009] Optionally, the side protrusion is semi-circular, rectangular or semi-elliptical.

[0010] Preferably, the body includes a first substrate and a second substrate, the protrusion is located between the first substrate and the second substrate, the first substrate corresponds to the positive electrode of the battery, and the second substrate corresponds to the negative electrode of the battery.

[0011] A lithium battery includes the above-mentioned stop bracket, and the explosion-proof valve on the lithium battery faces the protrusion of the stop bracket.

[0012] In the present utility model, for the proposed stop bracket and the lithium battery to which it is applied, the body of the stop bracket faces the explosion-proof valve of the battery as in the prior art, and the size of the protrusion is determined according to the structure of the explosion-proof valve. Without changing the size of the protrusion, the present utility model reduces the contact area with the explosion-proof valve by setting the first bottom surface and the second bottom surface, thereby reducing the wear of the winding core.

[0013] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present utility model;

[0015] In the figure: 1, body; 10, first substrate; 11, second substrate; 2, protrusion; 20, middle protrusion; 200, middle through hole; 21, side protrusion; 210, side through hole; 3, first bottom surface; 4, second bottom surface; 5, ventilation structure. Detailed Description of the Invention

[0016] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0017] As Figure 1 shown, a stop bracket includes a body 1, a protrusion 2 is provided on the body 1, the protrusion 2 abuts against the winding core, and the protrusion 2 faces the explosion-proof valve on the lithium battery. A groove is formed on the protrusion 2. The surface of the protrusion 2 away from the body 1 has a first bottom surface 3 and a second bottom surface 4. The distance from the first bottom surface 3 to the body 1 is greater than the distance from the second bottom surface 4 to the body 1. The first bottom surface 3 contacts the winding core, and the second bottom surface 4 does not contact the winding core. That is, the groove includes a middle groove and a side groove, and the depth of the side groove is less than the depth of the middle groove. The height difference between the first bottom surface 3 and the second bottom surface 4 reduces the contact area between the protrusion 2 and the winding core, and reduces the wear area of the winding core;

[0018] Specifically, in this embodiment, the protrusion 2 includes an intermediate protrusion 20 and side protrusions 21 provided on the body 1. The side protrusions 21 are located on the sides of the intermediate protrusion 20. The bottom surface of the intermediate protrusion 20 is the first bottom surface 3, and the bottom surface of the side protrusions 21 is the second bottom surface 4. Optionally, the intermediate protrusion 20 is rectangular, and in this embodiment, the side protrusions 21 are semi-elliptical. Of course, those skilled in the art can set the shapes of the intermediate protrusion 20 and the side protrusions 21 according to actual situations.

[0019] Since the protrusion 2 faces the explosion-proof valve of the battery, in order to achieve better explosion-proof performance, preferably, a vertical intermediate through-hole 200 is provided on the intermediate protrusion 20, and a plurality of intermediate through-holes 200 are provided. The side protrusions 21 have side through-holes 210, and a plurality of side through-holes 210 are provided. The intermediate protrusion 20 has a ventilation structure 5 for communicating at least one intermediate through-hole 200 and at least one side through-hole 210. The ventilation structure 5 can be a hole structure horizontally provided on the intermediate protrusion 20.

[0020] Preferably, there are two groups of side protrusions 21. The two groups of side protrusions 21 are distributed along the length direction of the body 1, and the intermediate protrusion 20 is located between the two groups of side protrusions 21, that is, one group of side protrusions 21 is located on the first side of the intermediate protrusion 20, and the other group of intermediate protrusions 20 is located on the second side of the intermediate protrusion 20. The first side and the second side are opposite.

[0021] Preferably, the body 1 includes a first substrate 10 and a second substrate 11. The protrusion 2 is located between the first substrate 10 and the second substrate 11. The first substrate 10 corresponds to the positive electrode of the battery, and the second substrate 11 corresponds to the negative electrode of the battery.

[0022] A lithium battery includes the above-mentioned stopper, and the explosion-proof valve on the lithium battery faces the protrusion 2 of the stopper. The battery core of the battery abuts against the first bottom surface 3, thereby reducing the wear of the battery core.

[0023] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0024] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In the present utility model, unless otherwise clearly stipulated and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] In the present utility model, unless otherwise clearly stipulated and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0027] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A stop frame, comprising a body (1), the body (1) being provided with a protrusion (2), the protrusion (2) being in contact with a winding core, characterized in that: The side of the protrusion (2) away from the main body (1) comprises a first bottom surface (3) and a second bottom surface (4); the distance from the first bottom surface (3) to the main body (1) is greater than the distance from the second bottom surface (4) to the main body (1); and the first bottom surface (3) is in contact with the winding core.

2. The stop frame according to claim 1, characterized in that: The protrusion (2) comprises a middle protrusion (20) and a side protrusion (21) provided on the body (1); the side protrusion (21) is located on the side of the middle protrusion (20); the bottom surface of the middle protrusion (20) is a first bottom surface (3); and the bottom surface of the side protrusion (21) is a second bottom surface (4).

3. The stop frame according to claim 2, characterized in that: The middle protrusion (20) is provided with a vertical middle through hole (200), the side protrusion (21) is provided with a side through hole (210), and the middle protrusion (20) is provided with a ventilation structure (5) for connecting the middle through hole (200) and the side through hole (210).

4. The stop frame according to claim 2, characterized in that: The side protrusions (21) are provided in two groups, the two groups of side protrusions (21) are distributed along the length direction of the body (1), and the middle protrusion (20) is located between the two groups of side protrusions (21).

5. The stop frame according to claim 2, characterized in that: The middle protrusion (20) is rectangular.

6. The stop frame according to claim 2, characterized in that: The side protrusion (21) is semicircular, rectangular or semi-elliptical.

7. The stop frame according to claim 1, characterized in that: The body (1) comprises a first substrate (10) and a second substrate (11), and the protrusion (2) is located between the first substrate (10) and the second substrate (11).

8. A lithium battery, characterized in that: It comprises a stop frame as described in any one of claims 1 to 7, and the explosion-proof valve on the lithium battery is opposite to the protrusion (2) of the stop frame.

Images