Cylindrical battery pressure relief structure capable of being used for liquid injection and cylindrical battery
By designing annular surfaces for support and pressure relief on the casing and end caps of cylindrical batteries, the problems of casing bottom damage and insufficient deformation sensitivity during liquid injection are solved, thus achieving safe pressure relief and improved safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-04-10
AI Technical Summary
The existing pressure relief structure of cylindrical batteries is prone to leakage at the bottom of the casing due to deep grooves during the liquid injection process, or decreased deformation sensitivity when the grooves are shallow, posing a safety risk.
A pressure relief structure was designed, including a support part of the shell and a pressure relief part of the end cap. By matching the annular surface and the annular notch, the pressure relief area is increased and the deformation sensitivity is improved, preventing the end cap from breaking and ensuring safe pressure relief.
It effectively relieves pressure during liquid injection, prevents end cap damage, improves pressure relief sensitivity, increases pressure relief area, and ensures battery safety during use.
Smart Images
Figure CN224110422U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to cylindrical battery technical field, concretely relates to a cylindrical battery pressure -relief structure and cylindrical battery for liquid injection. BACKGROUND
[0002] Lithium ion / sodium ion cylindrical battery has gradually become the mainstream product of new energy industry because of high energy density, good capacity consistency and supporting high rate charge and discharge advantages. More and more manufacturers are continuously improving the energy density of cylindrical battery, and also continuously pursuing its high safety.
[0003] At present, in order to ensure the safety of cylindrical battery, the pressure relief structure is usually arranged on the end cover of cylindrical battery, so that when the internal pressure of cylindrical battery exceeds the threshold value, the airflow in cylindrical battery can be released by breaking the pressure relief structure, to avoid the explosion of cylindrical battery.
[0004] However, the pressure relief structure of the existing cylindrical battery is usually a line notch arranged on the shell bottom. When the liquid injection gun head is inserted into the counterbore reserved in the middle of the shell bottom to inject electrolyte into the shell body, the liquid injection gun head will exert a pressure to press down the shell bottom to ensure the sealing during the liquid injection. At this time, if the above-mentioned line notch is deep, the deformation sensitivity of the shell bottom is high, which can ensure the normal pressure relief of the cylindrical battery, but the pressing action will cause the shell bottom at the line notch to be damaged and unable to avoid the leakage problem. If the above-mentioned line notch is shallow, the shell bottom connection strength is large, which can avoid the shell bottom damage caused by the pressing action, but the shell bottom deformation is difficult when the cylindrical battery is abnormal and the internal pressure increases, the breaking pressure of the line notch is generally high, the deformation sensitivity is reduced, which will bring safety risk to the use of the battery. UTILITY MODEL CONTENTS
[0005] In view of the deficiencies of the prior art, the utility model provides a cylindrical battery pressure relief structure and cylindrical battery for liquid injection to solve the problem that the line notch of the existing cylindrical battery pressure relief structure is deep and will cause shell bottom damage and leakage due to liquid injection pressing, and the problem that the shell bottom deformation sensitivity is reduced and brings safety risk to the use of the battery when the line notch is shallow.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:
[0007] A cylindrical battery pressure relief structure for liquid injection, comprising:
[0008] A shell in a cylindrical structure, a first annular notch extending downward from the outer circumferential side of the upper end of the shell is arranged on the outer circumferential side of the upper end of the shell to form a support part on the upper end of the shell; and
[0009] The end cover has a convex ring extending downward, and a second annular notch extending upward from the lower edge of the convex ring on the inner circumferential side of the convex ring to form a pressure relief part at the lower edge of the convex ring.
[0010] The end cover is fixed on the shell, and the pressure relief part cooperates with the support part to form a pressure relief structure after the first and second annular notches.
[0011] In an embodiment of the present disclosure, the support part comprises a first annular surface, a second annular surface and a third annular surface arranged in sequence, the first annular surface is arranged parallel and horizontally above the third annular surface, and the first annular surface and the third annular surface are connected through the second annular surface.
[0012] The pressure relief part comprises a fourth annular surface, a fifth annular surface and a sixth annular surface arranged in sequence, the fourth annular surface is arranged parallel and horizontally below the sixth annular surface, and the fourth annular surface and the sixth annular surface are connected through the fifth annular surface.
[0013] The first annular surface and the sixth annular surface are connected in abutment, the second annular surface and the fifth annular surface are closely attached, and the third annular surface and the fourth annular surface are connected in abutment.
[0014] In an embodiment of the present disclosure, the second annular surface and the fifth annular surface are arranged vertically or obliquely.
[0015] When they are arranged obliquely, they can form an eight-shaped structure in the longitudinal cross-sectional direction of the end cover.
[0016] In an embodiment of the present disclosure, the angle between the second annular surface or the fifth annular surface and the axis of the end cover is greater than or equal to 0° and less than or equal to 8°.
[0017] In an embodiment of the present disclosure, the third annular surface and the fourth annular surface are fixedly connected together by laser welding after being sealedly fitted.
[0018] In an embodiment of the present disclosure, the width of the third annular surface and the fourth annular surface is 0.2-0.5mm.
[0019] In an embodiment of the present disclosure, the shell and the end cover are integrally punched or cold extruded.
[0020] In an embodiment of the present disclosure, the shell and the end cover are made of aluminum material.
[0021] A cylindrical battery comprises the cylindrical battery pressure relief structure for liquid injection according to any one of the above.
[0022] Compared with the prior art, the utility model has the beneficial effects that:
[0023] 1、 through the mutual cooperation of the pressure relief part and the supporting part of thickness thinning, the down pressure of the end cover caused by liquid injection can be relieved, the breakage of the end cover is prevented, the deformation sensitivity of the pressure relief part is improved to realize normal pressure relief, so that the safety of the battery use process is ensured.
[0024] 2、 through the mutual abutment of the first annular surface and the sixth annular surface, the third annular surface and the fourth annular surface, effective support can be formed on the end cover in the axial direction, the down pressure of the end cover caused by liquid injection is transmitted to the shell and is relieved, so that the breakage of the end cover is prevented; By the close adhesion of the second annular surface and the fifth annular surface, the pressure relief structure of the existing end cover line mark is transferred from the plane position to the side surface of the shell, the pressure relief area is increased, and the safety of the battery is improved.
[0025] 3、 through the inclined setting of the second annular surface and the fifth annular surface, the head of the pressure relief part is narrow, the root is wide, the deformation sensitivity of the pressure relief part can be further improved, and the pressure relief area is increased, so that the safety of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS
[0026] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor.
[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the cylindrical battery in the utility model;
[0028] Figure 2 It is a schematic diagram of the sectional structure of the pressure relief structure in the utility model;
[0029] Figure 3 It is Figure 2 the schematic diagram of the enlarged structure of the local part A in the utility model;
[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the shell;
[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the end cover. DETAILED DESCRIPTION
[0032] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and description are to be regarded as being illustrative in nature rather than restrictive.
[0033] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0034] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.
[0035] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0036] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical height of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical height of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than the second feature.
[0037] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. For simplicity of the disclosure, the description below refers to specific examples of components and arrangements of the present application. It is understood that these are merely examples and are not intended to limit the present application in any manner.
[0038] The embodiments of the present application will be described in detail below with reference to the drawings.
[0039] Referring to Figures 1-5 As shown in the drawings, in one aspect, the present application provides a cylindrical battery pressure relief structure for liquid injection, comprising:
[0040] The shell 10 is in a cylindrical structure, and a first annular notch extending downward from the upper end of the shell 10 is provided on the outer circumferential side of the upper end of the shell 10 to form a support portion 11 at the upper end of the shell 10; and
[0041] The end cover 20 has a downwardly extending protruding ring 21, and a second annular notch extending upward from the lower edge of the protruding ring 21 is provided on the inner circumferential side of the protruding ring 21 to form a pressure relief portion 22 at the lower edge of the protruding ring 21.
[0042] Wherein, the end cover 20 is fixedly covered on the shell 10, at this time, the pressure relief portion 22 cooperates with the support portion 11 (i.e. the pressure relief portion 22 is supported by the support portion 11 in the axial direction) to eliminate the first annular notch and the second annular notch to form a pressure relief structure.
[0043] When the liquid injection gun head is inserted into the counterbore 23 reserved in the middle of the end cover 20 to inject electrolyte into the inside of the shell 10, the downward pressure of the liquid injection gun head acting on the end cover 20 can be transmitted to the support portion 11 of the shell 10 through the pressure relief portion 22 to relieve the pressure on the end cover 20, preventing the end cover 20 from being damaged, thereby avoiding the problem of liquid leakage and ensuring the smooth progress of liquid injection; in addition, due to the existence of the second annular notch, the thickness of the pressure relief portion 22 is appropriately thinned, which can improve the deformation sensitivity at this point, thereby ensuring the normal pressure relief of the cylindrical battery. That is to say, through the cooperation of the pressure relief portion 22 with the support portion 11, the downward pressure on the end cover 20 due to liquid injection can be relieved, preventing the end cover 20 from being damaged while improving the deformation sensitivity of the pressure relief portion 22 to achieve normal pressure relief, thereby ensuring the safety of the battery during use.
[0044] The support part 11 comprises a first annular surface, a second annular surface and a third annular surface arranged in sequence, the first annular surface is arranged horizontally and parallel to the third annular surface, and the first annular surface and the third annular surface are connected through the second annular surface; the pressure relief part 22 comprises a fourth annular surface, a fifth annular surface and a sixth annular surface arranged in sequence, the fourth annular surface is arranged horizontally and parallel to the sixth annular surface, and the fourth annular surface and the sixth annular surface are connected through the fifth annular surface; the first annular surface is connected with the sixth annular surface in abutment, the second annular surface is tightly attached to the fifth annular surface, and the third annular surface is connected with the fourth annular surface in abutment. Through the first annular surface and the sixth annular surface in abutment and the third annular surface and the fourth annular surface in abutment, effective support can be formed on the end cover 20 in the axial direction, so that the downward pressure of the end cover 20 caused by liquid injection is transmitted to the shell 10 and is relieved, thereby preventing the end cover 20 from being damaged; through the tight attachment of the second annular surface and the fifth annular surface, the pressure relief structure of the existing end cover is transferred from the planar position to the side surface of the shell 10, the pressure relief area is increased, and the safety of the battery is improved.
[0045] The second annular surface and the fifth annular surface are vertically or obliquely arranged; when obliquely arranged, they can form an eight-shaped structure in the longitudinal cross-sectional direction of the end cover 20. Through the oblique arrangement of the second annular surface and the fifth annular surface, the head of the pressure relief part 22 is narrow and the root is wide, so that the deformation sensitivity of the pressure relief part 22 can be further improved, the pressure relief area is increased, and the safety of the battery is improved.
[0046] In the embodiment, the included angle α between the second annular surface or the fifth annular surface and the axis of the end cover 20 is greater than or equal to 0° and less than or equal to 8° (i.e. equal to 0° when vertically arranged and not equal to 0° when obliquely arranged).
[0047] The third annular surface and the fourth annular surface are fixedly connected together through laser welding after being sealingly matched.
[0048] Referring to Figure 3 As shown in the figure, the width W of the third annular surface and the fourth annular surface is preferably 0.2-0.5 mm.
[0049] In the embodiment, the shell 10 and the end cover 20 are made of aluminum material through one-piece stamping or cold extrusion forming.
[0050] Referring to Figure 1 On the other hand, the utility model provides a cylindrical battery which comprises the cylindrical battery pressure relief structure for liquid injection.
[0051] The above embodiment is only a preferred embodiment of the utility model, and does not limit the technical scheme of the utility model, and any technical scheme which can be realized on the basis of the above embodiment without creative labor should be regarded as falling within the protection scope of the utility model patent.
Claims
1. A cylindrical battery pressure relief structure usable for liquid injection, characterized by, The application relates to a cylindrical battery pressure relief structure for liquid injection, which comprises a shell in a cylindrical structure, an outer circumferential side of an upper end of the shell is provided with a first annular notch extending downward from the shell to form a supporting part at the upper end of the shell, and an end cover with a convex ring extending downward, an inner circumferential side of the convex ring is provided with a second annular notch extending upward from the convex ring to form a pressure relief part downward of the convex ring.
2. The cylindrical battery pressure relief structure for liquid injection according to claim 1, wherein the supporting part comprises a first annular surface, a second annular surface and a third annular surface arranged in sequence, the first annular surface is arranged horizontally and parallel to the third annular surface, and the first annular surface and the third annular surface are connected through the second annular surface; the pressure relief part comprises a fourth annular surface, a fifth annular surface and a sixth annular surface arranged in sequence, the fourth annular surface is arranged horizontally and parallel to the sixth annular surface, and the fourth annular surface and the sixth annular surface are connected through the fifth annular surface; the first annular surface and the sixth annular surface are connected in abutment, the second annular surface and the fifth annular surface are tightly attached, and the third annular surface and the fourth annular surface are connected in abutment.
3. The cylindrical battery pressure relief structure for liquid injection according to claim 2, wherein the second annular surface and the fifth annular surface are vertically or obliquely arranged; when obliquely arranged, they form an eight-shaped structure in the longitudinal section direction of the end cover; the included angle between the second annular surface or the fifth annular surface and the axis of the end cover is greater than or equal to 0° and less than or equal to 8°; the third annular surface and the fourth annular surface are fixedly connected through laser welding after being tightly attached; the width of the third annular surface and the fourth annular surface is 0.2-0.5 mm; the shell and the end cover are integrally punched or cold extruded; the shell and the end cover are made of aluminum material; and the cylindrical battery pressure relief structure for liquid injection according to any one of claims 1-8 is included. 4. The cylindrical battery pressure relief structure for liquid injection according to claim 3, wherein 5. The pressure relief structure for a cylindrical battery which is filled with a liquid according to any one of claims 2 to 4, wherein 6. The cylindrical battery pressure relief structure for liquid injection according to claim 5, wherein 7. The cylindrical battery pressure relief structure for liquid injection according to claim 1 or 6, wherein 8. The cylindrical battery pressure relief structure for liquid injection according to claim 7, wherein 9. A cylindrical battery, characterized by