Exhaust support gasket, lithium battery and electric device

Abstract

This utility model discloses an exhaust support gasket, a lithium battery, and an electrical device, belonging to the field of lithium battery technology. The exhaust support gasket includes a body portion, on which a first surface and a second surface are provided opposite each other in the thickness direction, with the second surface facing the explosion-proof valve. The body portion is provided with a main exhaust hole and a secondary exhaust hole penetrating the first and second surfaces, with the position of the main exhaust hole corresponding to the position of the explosion-proof valve. A main boss and a secondary boss protruding from the second surface are respectively provided around the periphery of the main exhaust hole and the secondary exhaust hole. The alignment of the main exhaust hole with the explosion-proof valve allows gas to pass quickly through the gasket and be concentrated at the opening of the explosion-proof valve for discharge, resulting in smoother and more efficient exhaust.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to an exhaust support pad, a lithium battery, and an electrical device. Background Technology

[0002] Currently, most power battery packaging involves placing the two curved surfaces of the bare cell facing the two sides of the casing, with the tabs facing the top opening of the casing, and the surface opposite the tabs facing the bottom of the casing. Furthermore, an explosion-proof valve is typically installed at the top of the casing. If the explosion-proof valve is only located at the top, high-temperature gases may clog the valve body due to limited space at the top or cell expansion, leading to delayed pressure relief or even failure.

[0003] Therefore, for module safety considerations, some power batteries have their explosion-proof valves placed at the bottom of the casing. For example, Chinese patent document CN117239332A discloses a support member, a secondary battery, and an electrical device. The support member includes multiple first connecting plates and multiple second connecting plates; the multiple first connecting plates and multiple second connecting plates are spaced apart along a first direction X; there is a first groove between adjacent first connecting plates and a second groove between adjacent second connecting plates; the support member has multiple first vent holes penetrating along a second direction Y to connect the first groove and the second groove; wherein, the first direction X intersects the second direction Y.

[0004] Although the support can vent gas through the first vent, the first vent is too dispersed on the support, making it impossible to concentrate the thermal runaway gas to the explosion-proof valve opening for discharge, resulting in relatively low venting efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide an exhaust support pad, a lithium battery, and electrical equipment to solve the problem that the exhaust holes of the support components in the prior art are too dispersed, making it impossible to concentrate the thermal runaway gas to the explosion-proof valve opening for discharge, resulting in relatively low exhaust efficiency.

[0006] To achieve the above objectives, this utility model provides an exhaust support pad for placement inside the housing of a battery unit, wherein the bottom housing of the battery unit is provided with an explosion-proof valve; the exhaust support pad includes a body portion, the body portion having a first surface and a second surface opposite to each other in its thickness direction, the second surface being positioned towards the explosion-proof valve; the body portion having a main exhaust hole and a secondary exhaust hole penetrating the first surface and the second surface, the position of the main exhaust hole corresponding to the position of the explosion-proof valve; the periphery of the main exhaust hole and the secondary exhaust hole are respectively provided with a main boss and a secondary boss protruding from the second surface.

[0007] Furthermore, the main boss and / or secondary boss are continuous structures, and the continuous structures surround the outside of the main exhaust port and / or secondary exhaust port.

[0008] Through the above technical solutions, the continuous structure can increase the length of the main boss or the secondary boss, provide a larger support area at the bottom of the shell, improve the support stability of the main body, and provide better structural strength to the edges of the main exhaust port or the secondary exhaust port.

[0009] Furthermore, the main boss and / or secondary boss has a segmented structure, which surrounds the outside of the main exhaust port and / or secondary exhaust port. The segmented structure includes multiple boss segments, which are evenly distributed on the outside of the main exhaust port and / or secondary exhaust port.

[0010] Through the above technical solution, the segmented structure includes multiple boss segments, which are disconnected from each other to form exhaust intervals. This allows the airflow concentrated at the explosion-proof valve location to be diverted, reducing the exhaust pressure at the explosion-proof valve location. The multiple boss segments are evenly distributed on the outside of the main or secondary exhaust port, which helps to ensure uniform airflow and improve the support stability of the main body, thereby improving the support stability of the battery cell.

[0011] Furthermore, the main exhaust port and the secondary exhaust port are connected by an air guide groove.

[0012] Through the above technical solutions, the gas guide groove can guide the gas collected by the secondary exhaust port to the main exhaust port, so that the gas can be quickly discharged from the explosion-proof valve opening, avoiding gas accumulation and improving the efficiency of airflow through the main exhaust port.

[0013] Furthermore, the air guide groove is a through groove that completely penetrates the main body or a submerged groove that partially penetrates the main body.

[0014] Through the above technical solutions, when the air guide groove is a through groove, the airflow is better and the air guiding efficiency is higher. When the air guide groove is a recessed groove, the recessed groove is located on the second surface, which has the functions of airflow guidance and structural connection, and has better connection strength.

[0015] Furthermore, both the main exhaust port and the secondary exhaust port are connected to a venting groove on their outer sides, and the venting groove extends away from the center of the main exhaust port or the secondary exhaust port; the size of the main exhaust port is larger than the size of the explosion-proof valve opening.

[0016] Through the above technical solutions, the venting groove can partially disperse the airflow concentrated in the main or secondary vent, reducing airflow pressure. The size of the main vent is larger than the opening of the explosion-proof valve, which avoids obstructing the valve opening and improves venting efficiency.

[0017] This utility model also provides a lithium battery, including a casing, a cell, and the aforementioned venting support pad. The first surface of the venting support pad faces the cell and supports the cell, and the second surface faces the bottom of the casing. The main boss and the secondary boss are in contact with the bottom of the casing.

[0018] This utility model also provides an electrical device, including the aforementioned lithium battery.

[0019] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:

[0020] This utility model discloses an exhaust support gasket that separates the battery cell from the bottom of the battery casing, preventing the battery cell from expanding and deforming and blocking the explosion-proof valve in the event of a runaway. The gasket body has a main exhaust port and a secondary exhaust port. The main exhaust port corresponds to the position of the explosion-proof valve, allowing gas to pass quickly through the gasket and be concentrated at the opening of the explosion-proof valve for discharge, resulting in smoother and more efficient exhaust. The main and secondary protrusions extend towards the second surface. When the gasket is installed inside the casing, the second surface faces the bottom of the casing, and the main and secondary protrusions contact the bottom of the casing, leaving a gap between the second surface of the gasket and the bottom of the casing, increasing the exhaust space and improving exhaust efficiency. Furthermore, the main and secondary protrusions are located around the main and secondary exhaust ports, increasing their structural strength and reducing the risk of port deformation.

[0021] It is obvious that the elements or features described in the above individual embodiments can be used alone or in combination in other embodiments. Attached Figure Description

[0022] The dimensions and scales in the accompanying drawings do not represent the actual dimensions and scales of the product. The drawings are for illustrative purposes only, and some non-essential elements or features have been omitted for clarity.

[0023] Figure 1 This is a schematic diagram (one) of the structure of the exhaust support pad in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram (a) of the structure of the first surface of the exhaust support pad in an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram (a) of the structure of the second surface of the exhaust support pad in an embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram (II) of the structure of the exhaust support pad in this embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram (II) of the structure of the first surface of the exhaust support pad in an embodiment of this utility model;

[0028] Figure 6 This is a schematic diagram (II) of the structure of the second surface of the exhaust support pad in an embodiment of this utility model.

[0029] Explanation of reference numerals in the attached figures

[0030] 100. Body part; 110. Main exhaust port; 111. Main boss; 120. Secondary exhaust port; 121. Secondary boss; 130. Air guide groove; 140. Air vent groove. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings. The embodiments described herein are merely preferred embodiments of the present invention. Those skilled in the art can conceive of other ways to implement the present invention based on the preferred embodiments, and such other ways also fall within the scope of the present invention.

[0032] Reference Figures 1-6 This embodiment provides a venting support pad for placement within the housing of a battery cell. The bottom housing of the battery cell is equipped with an explosion-proof valve. The bottom explosion-proof valve serves as a redundancy design, providing a second pressure relief channel in case the top valve is blocked, ensuring rapid gas discharge. The venting support pad includes a body portion 100, which has opposing first and second surfaces along its thickness direction. The first surface supports the battery cell, and the second surface faces the explosion-proof valve. The support pad separates the battery cell from the bottom of the battery housing, preventing the battery cell from expanding and deforming and blocking the explosion-proof valve in case of runaway. The body portion 100 has a main vent hole 110 and a secondary vent hole 120 penetrating the first and second surfaces. The position of the main vent hole 110 corresponds to the location of the explosion-proof valve, allowing gas to pass quickly through the pad for smoother venting. The secondary vent hole 120 increases the venting channel and improves venting efficiency. The main exhaust port 110 and the secondary exhaust port 120 are respectively provided with a main boss 111 and a secondary boss 121 protruding from the second surface. When the support pad is installed in the housing, the second surface faces the bottom of the housing, and the main boss 111 and the secondary boss 121 contact the bottom of the housing, leaving a gap between the second surface of the pad and the bottom of the housing, increasing the exhaust space and improving exhaust efficiency. Moreover, the main boss 111 and the secondary boss 121 are located around the main exhaust port 110 and the secondary exhaust port 120, which can increase the structural strength of the main exhaust port 110 and the secondary exhaust port 120 and reduce the risk of hole deformation.

[0033] It should be noted that the size of the main exhaust port 110 is larger than the size of the explosion-proof valve opening, so as to avoid obstructing the explosion-proof valve opening and improve exhaust efficiency.

[0034] In some embodiments, such as Figure 3As shown, the main boss 111 and the secondary boss 121 are continuous structures, surrounding the outside of the main exhaust port 110 and the secondary exhaust port 120. The continuous structure increases the length of the main boss 111 or the secondary boss 121, providing a larger support area at the bottom of the housing, improving the support stability of the body 100, and providing better structural strength to the edges of the main exhaust port 110 or the secondary exhaust port 120. It should be noted that both the main boss 111 and the secondary boss 121 can be continuous structures simultaneously, or either one can be a continuous structure.

[0035] In other embodiments, the main boss 111 and the secondary boss 121 are segmented structures, surrounding the outside of the main exhaust port 110 and the secondary exhaust port 120. The segmented structure includes multiple boss segments, which are disconnected from each other to form exhaust intervals. This allows for the diversion of airflow concentrated at the explosion-proof valve location, reducing the exhaust pressure at that location. The multiple boss segments are evenly distributed outside the main exhaust port 110 or the secondary exhaust port 120, contributing to uniform airflow distribution and improving the support stability of the body 100, thereby enhancing the support stability of the battery cell. It should be noted that both the main boss 111 and the secondary boss 121 can be segmented structures simultaneously, or either one can be segmented.

[0036] Furthermore, in order to improve the efficiency of airflow through the main exhaust port 110, such as... Figure 1 and Figure 4 As shown, the main exhaust port 110 and the secondary exhaust port 120 are connected by a gas guide groove 130. The gas guide groove 130 can guide the gas collected in the secondary exhaust port 120 to the main exhaust port 110, so that the gas can be quickly discharged from the opening of the explosion-proof valve and avoid the accumulation of gas.

[0037] It is understandable that the air guide groove 130 is either a through groove that completely penetrates the main body 100 or a recessed groove that partially penetrates the main body 100. When the air guide groove 130 is a through groove, the airflow passage is better, resulting in higher air guiding efficiency. When the air guide groove 130 is a recessed groove, the recessed groove is located on the second surface, serving both airflow guiding and structural connection functions, resulting in better connection strength.

[0038] In other implementations, such as Figures 4-6 As shown, both the main exhaust port 110 and the secondary exhaust port 120 are connected to venting grooves 140 on their outer sides. The venting grooves 140 extend away from the center of the main exhaust port 110 or the secondary exhaust port 120. Two venting grooves 140 are provided on the edge of the main exhaust port 110, located on opposite sides of the main exhaust port 110. Three venting grooves 140 are provided on the edge of the secondary exhaust port 120, arranged radially. The venting grooves 140 can partially disperse the airflow concentrated in the main exhaust port 110 or the secondary exhaust port 120, reducing airflow pressure.

[0039] One aspect of this application provides a lithium battery, including a casing, a battery cell, and the aforementioned venting support pad. The first surface of the venting support pad faces the battery cell and supports it, while the second surface faces the bottom of the casing. A main protrusion 111 and a secondary protrusion 121 contact the bottom of the casing. This lithium battery possesses the advantages of this support pad, allowing for timely gas venting in the event of thermal runaway, thus improving battery safety.

[0040] Another aspect of this application provides an electrical device including the aforementioned lithium battery. The electrical device can be various types of equipment such as new energy vehicles, computers, and energy storage power supply devices. It is understood that the electrical device can include all the technical features and beneficial effects of the aforementioned exhaust support pad or lithium battery, which will not be elaborated here.

[0041] In the description of this utility model, it should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] The scope of protection of this utility model is defined only by the claims. Thanks to the teachings of this utility model, those skilled in the art will readily recognize that alternative structures to the disclosed structure can be used as feasible alternative implementations, and that the disclosed implementations can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. An exhaust support gasket for placement within a housing of a battery cell, a bottom housing of the battery cell being provided with a burst valve; the exhaust support gasket comprising a body portion (100) provided with opposing first and second surfaces in a thickness direction thereof, the second surface being provided toward a position of the burst valve; characterized in that, The main body (100) is provided with a main exhaust hole (110) and a secondary exhaust hole (120) penetrating the first surface and the second surface. The position of the main exhaust hole (110) corresponds to the position of the explosion-proof valve. The main exhaust hole (110) and the secondary exhaust hole (120) are respectively provided with a main boss (111) and a secondary boss (121) protruding from the second surface.

2. An exhaust support gasket according to claim 1, wherein, The main boss (111) and / or the secondary boss (121) are continuous structures, which surround the outside of the main exhaust port (110) and / or the secondary exhaust port (120).

3. An exhaust support gasket according to claim 1 wherein, The main boss (111) and / or the secondary boss (121) are segmented structures, which surround the outside of the main exhaust port (110) and / or the secondary exhaust port (120).

4. An exhaust support gasket according to claim 3, wherein, The segmented structure includes multiple boss segments, which are evenly distributed on the outside of the main exhaust port (110) and / or the secondary exhaust port (120).

5. An exhaust support gasket according to claim 1 wherein, The main exhaust port (110) and the secondary exhaust port (120) are connected by an air guide groove (130).

6. An exhaust support gasket according to claim 5, wherein, The air guide groove (130) is a through groove that completely penetrates the main body (100) or a sink groove that partially penetrates the main body (100).

7. An exhaust support gasket according to claim 1 wherein, The outer sides of the main exhaust port (110) and the secondary exhaust port (120) are each connected to a venting groove (140), which extends in a direction away from the center of the main exhaust port (110) or the secondary exhaust port (120).

8. An exhaust support gasket according to claim 1 wherein, The size of the main exhaust port (110) is larger than the size of the explosion-proof valve opening.

9. A lithium battery, characterized by The device includes a housing, a battery cell, and an exhaust support pad as described in any one of claims 1-8, wherein a first surface of the exhaust support pad is disposed facing the battery cell and supports the battery cell, and a second surface is disposed facing the bottom of the housing, and the main boss (111) and the secondary boss (121) are in contact with the bottom of the housing.

10. An electric device, characterized by Including the lithium battery as described in claim 9.

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