Battery cover plate structure and battery

Abstract

The utility model provides a battery cover plate structure. The battery cover plate structure comprises a cover plate body, an insulating part and a glue sealing part, the insulating part is mounted on one side, close to the battery cell, of the cover plate body, and a liquid storage cavity for storing a flame retardant and a release hole communicated with the liquid storage cavity are formed in the insulating part; the release hole is positioned on one side of the insulating part away from the cover plate body; and the glue sealing piece blocks the release hole, and the glue sealing piece is melted after reaching the melting point, so that the flame retardant in the liquid storage cavity is released. The utility model also provides a battery which comprises a shell and the battery cover plate structure arranged on the shell. When the battery is in thermal runaway, a large amount of heat is generated, so that after the glue sealing piece reaches a melting point, the glue sealing piece is melted, and the flame retardant in the liquid storage cavity is released towards electrolyte in the battery, so as to prevent the battery core from burning; therefore, the flame retardant can be matched with the conventional electrolyte for use, so that the flame retardant does not participate in battery circulation and does not influence the service life of the battery when the battery is normally used.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cover plates, in particular to a battery cover plate structure and a battery. Background Art

[0002] During battery safety tests, such as thermal runaway and needle puncture verification, a large amount of heat is generated due to short circuit, which can cause the electrolyte to burn. The traditional practice is to use a flame-retardant electrolyte. This method has high requirements for the electrolyte preparation process, which directly affects battery performance and affects battery life over long-term use. Utility Model Content

[0003] In response to the above-mentioned problems existing in the prior art, the technical problem to be solved by the present invention is that when the battery is short-circuited, a large amount of heat is generated, which will cause the electrolyte to burn. The traditional practice is to use a flame-retardant electrolyte. This method has high requirements for the electrolyte preparation process, which directly affects the battery performance and affects the battery life after long-term use.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a battery cover structure, comprising:

[0005] Cover plate body;

[0006] An insulating member installed on the side of the cover body close to the battery cell, the insulating member is provided with a liquid storage cavity for storing the flame retardant and a release hole connected to the liquid storage cavity; and the release hole is located on the side of the insulating member away from the cover body; and

[0007] A sealing member for sealing the release hole melts after reaching a melting point, so as to release the flame retardant in the liquid storage cavity toward the battery core.

[0008] Preferably, the cover body, the insulating member, the liquid storage cavity and the release hole are all coaxially arranged.

[0009] Preferably, the cover body is provided with a plurality of grooves in the circumferential direction close to the edge of the insulating member.

[0010] Preferably, a plug-in portion is provided on the side of the insulating part close to the cover body, and a slot that cooperates with the plug-in portion is opened on the side of the cover body close to the insulating part; a limiting portion is installed on the end of the plug-in part away from the insulating part, the thickness of the limiting portion is greater than the thickness of the plug-in part, and a limiting groove that cooperates with the limiting portion is opened in the slot.

[0011] Preferably, a protrusion is provided on the side of the insulating member away from the cover body, and the liquid storage cavity is located in the protrusion.

[0012] Preferably, radial reinforcing ribs are provided on a side of the insulating member away from the cover plate body, and a plurality of the radial reinforcing ribs are arranged in a circular array with the axis of the insulating member as the center.

[0013] Preferably, a circumferential reinforcing rib is further provided on a side of the insulating member away from the cover plate body, and the circumferential reinforcing rib is fixedly connected to an end of the radial reinforcing rib away from the axis of the insulating member.

[0014] Preferably, the insulating member is further provided with a pressing portion on an edge of one side away from the cover body.

[0015] Preferably, a boss is provided on the edge of the cover body.

[0016] A battery comprising:

[0017] housing; and

[0018] A battery cover structure is mounted on the housing.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] In the utility model, a flame retardant is injected into the liquid storage cavity in the insulating part through the release hole, and then the release hole is sealed by the sealing part. The cover plate body is then installed on the shell and insulated by the sealing part. When the battery thermal runaway generates a large amount of heat, the sealing part and the insulating part reach the melting point, and the sealing part and the insulating part begin to melt. The flame retardant in the liquid storage cavity is released into the electrolyte in the battery, thereby preventing the battery cell from burning. In this way, it can be used with a conventional electrolyte, which can ensure that when the battery is in normal use, the flame retardant does not participate in the battery cycle and does not affect the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0022] Figure 1 This is a schematic cross-sectional view of the battery cover structure provided in an embodiment of the present invention.

[0023] Figure 2 This is an exploded view of the battery cover structure provided in an embodiment of the present utility model.

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the insulating member provided in an embodiment of the present utility model.

[0025] Reference numerals:

[0026] 10-cover body, 11-groove, 12-slot, 13-limiting groove, 14-boss;

[0027] 20-insulating member, 21-liquid storage chamber, 22-release hole, 23-plug-in portion, 24-limiting portion, 25-protruding portion, 26-radial reinforcing rib, 27-circumferential reinforcing rib, 28-pressing portion;

[0028] 30-Sealing parts. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0030] In the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as a limitation to the present invention.

[0031] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] See also Figure 1-Figure 3 , the utility model provides an embodiment: a battery cover structure, comprising: a cover body 10, an insulating member 20 and a sealing member 30; the insulating member 20 is installed on the side of the cover body 10 close to the battery cell, and the insulating member 20 is provided with a liquid storage cavity 21 for storing flame retardant, and a release hole 22 connected to the liquid storage cavity 21; and the release hole 22 is located on the side of the insulating member 20 away from the cover body 10; the sealing member 30 blocks the release hole 22, and the sealing member 30 melts after reaching the melting point to release the flame retardant in the liquid storage cavity 21 toward the battery cell; further, the cover body 10, the insulating member 20, the liquid storage cavity 21 and the release hole 22 are all coaxially arranged; so that the flame retardant in the liquid storage cavity 21 can be released to the middle of the battery through the release hole 22, thereby improving the utilization rate of the flame retardant.

[0033] During specific implementation, the flame retardant is injected into the liquid storage cavity 21 in the insulating part 20 through the release hole 22, and then the release hole 22 is sealed by the sealing part 30, and then the cover body 10 is installed on the shell and insulated by the sealing part 30; the battery thermal runaway generates a large amount of heat, so that the sealing part 30 and the insulating part 20 reach the melting point, the sealing part 30 and the insulating part 20 begin to melt, and the flame retardant in the liquid storage cavity 21 is released into the electrolyte in the battery to prevent the battery cell from burning; in this way, it can be used with a conventional electrolyte, which can ensure that the flame retardant does not participate in the battery cycle when the battery is in normal use and does not affect the battery life.

[0034] Furthermore, the insulating member 20 can be made of solid insulating materials such as plastic; when the material of the insulating member 2 is plastic, the insulating member 20 is assembled and installed with the cover body 10 by hot melting; so that the insulating member 20 can also be melted by heat, thereby accelerating the release rate of the flame retardant in the liquid storage chamber 21; further, the release rate of the flame retardant can be controlled by specifically setting the size of the release hole 22, thereby ensuring that the flame retardant can prevent the battery cell from burning in time.

[0035] See also Figure 1-Figure 3 In other embodiments, a plurality of grooves 11 are provided in the circumferential direction of the cover body 10 near the edge of the insulating member 20; when the cover body 10 is installed on the battery shell, the grooves 11 are engaged with the corresponding structure of the shell, so that the cover body 10 can be better adapted to the battery shell, the cover body 10 can be limited, and the cover body 10 can be effectively prevented from rotating.

[0036] See also Figure 1-Figure 3 In other embodiments, a plug-in portion 23 is provided on the side of the insulating member 20 close to the cover body 10, and a slot 12 is provided on the side of the cover body 10 close to the insulating member 20 to cooperate with the plug-in portion 23; a limiting portion 24 is installed on the end of the plug-in portion 23 away from the insulating member 20, and the thickness of the limiting portion 24 is greater than that of the plug-in portion 23. A limiting groove 13 is provided in the slot 12 to cooperate with the limiting portion 24. In a specific implementation, the plug-in portion 23 and the limiting portion 24 are arranged in an annular shape, and the plug-in portion 23 is arranged coaxially with the insulating member 20; the insulating member 20 is inserted into the slot 12 on the cover body 10 through the plug-in portion 23, thereby positioning the insulating member 20 and improving the installation accuracy of the insulating member 20. The limiting portion 24 is engaged in the limiting groove 13, thereby improving the installation stability of the insulating member 20.

[0037] See also Figure 1-Figure 3 In other embodiments, a protrusion 25 is provided on the side of the insulating member 20 away from the cover body 10, and the liquid storage cavity 21 is located in the protrusion 25; thereby reducing the thickness of the insulating member 20 and reducing the consumables of the insulating member 20, thereby saving material costs.

[0038] See also Figure 1-Figure 3 In other embodiments, a radial reinforcing rib 26 is provided on the side of the insulating member 20 away from the cover body 10, and a plurality of radial reinforcing ribs 26 are arranged in a circular array with the axis of the insulating member 20 as the center. In a specific implementation, four radial reinforcing ribs 26 are provided, and the strength of the insulating member 20 is improved by the radial reinforcing ribs 26; further, a circumferential reinforcing rib 27 is further provided on the side of the insulating member 20 away from the cover body 10, and the circumferential reinforcing rib 27 is fixedly connected to the end of the radial reinforcing rib 26 away from the axis of the insulating member 20; by the provision of the circumferential reinforcing rib 27, the strength of the insulating member 20 can be further improved; specifically, a circumferential reinforcing rib 27 is provided at the end of each radial reinforcing rib 26, and the circumferential reinforcing rib 27 is provided in an arc shape coaxial with the insulating member 20, so that it can be more conveniently adapted to the battery shell.

[0039] See also Figure 1-Figure 3 In other embodiments, a pressing portion 28 is further provided on the edge of the insulating member 20 away from the cover body 10. Specifically, the pressing portion 28 is annular and integrally formed with the insulating member 20. The pressing portion 28 can effectively press the tabs on the winding core.

[0040] See also Figure 1-Figure 3 In other embodiments, a boss 14 is provided on the edge of the cover body 10; the boss 14 can abut against the upper end of the battery shell to better install and fix the cover body 10.

[0041] See also Figure 1-Figure 3 Another embodiment of the present invention provides a battery, comprising a housing and a battery cover structure mounted on the housing to seal the battery housing.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A battery cover structure, characterized in that: include: Cover plate body; An insulating member installed on the side of the cover body close to the battery cell, the insulating member is provided with a liquid storage cavity for storing the flame retardant and a release hole connected to the liquid storage cavity; and the release hole is located on the side of the insulating member away from the cover body; and A sealing member for sealing the release hole melts after reaching a melting point, so as to release the flame retardant in the liquid storage cavity toward the battery core.

2. The battery cover structure according to claim 1, characterized in that: The cover plate body, the insulating member, the liquid storage cavity and the release hole are all coaxially arranged.

3. The battery cover structure according to claim 1, characterized in that: The cover body is provided with a plurality of grooves in the circumferential direction close to the edge of the insulating member.

4. The battery cover structure according to claim 1, characterized in that: A plug-in portion is provided on the side of the insulating part close to the cover body, and a slot that cooperates with the plug-in portion is provided on the side of the cover body close to the insulating part; a limiting portion is installed on the end of the plug-in part away from the insulating part, the thickness of the limiting portion is greater than the thickness of the plug-in part, and a limiting groove that cooperates with the limiting portion is provided in the slot.

5. The battery cover structure according to claim 1, characterized in that: A protrusion is provided on one side of the insulating member away from the cover body, and the liquid storage cavity is located in the protrusion.

6. The battery cover structure according to claim 1, characterized in that: A radial reinforcing rib is provided on a side of the insulating member away from the cover plate body, and a plurality of the radial reinforcing ribs are arranged in a circular array with the axis of the insulating member as the center.

7. The battery cover structure according to claim 6, characterized in that: A circumferential reinforcing rib is further provided on a side of the insulating member away from the cover plate body, and the circumferential reinforcing rib is fixedly connected to an end of the radial reinforcing rib away from the axis of the insulating member.

8. The battery cover structure according to claim 1, characterized in that: The insulating member is further provided with a pressing portion on an edge of one side away from the cover body.

9. The battery cover structure according to claim 1, characterized in that: A boss is provided on the edge of the cover body.

10. A battery, characterized in that: include: case; and A battery cover structure according to any one of claims 1 to 9 mounted on the housing.

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