A grid spacer, a lithium battery and an electric device

Abstract

The utility model discloses a grating gasket, lithium cell and electrical equipment belong to lithium cell technical field, grating gasket is used for placing in the casing of battery unit, the bottom casing of battery unit is provided with explosion -proof valve, grating gasket includes the body part, the first surface and second surface are oppositely arranged along its thickness direction to the body part, the body part is provided with main grid hole and a plurality of vice grid holes, the main grid hole and vice grid hole all are through first surface and second surface, the main grid hole is set up to the position of explosion -proof valve, a plurality of vice grid holes are around the circumferential side of main grid hole, and the space ratio of main grid hole and vice grid hole is not less than 70% relative to the body part. The utility model discloses the main grid hole and vice grid hole occupy most of the space of the body part, and there is enough exhaust space, and it is favorable to the gas rapid through grating gasket, improves the exhaust efficiency.

Description

Technical Field

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

[0002] Most battery cells have a rigid shell structure, and their bare cells are basically wound or stacked structures made by separating the anode and cathode plates with separators. With the increasing requirements for cell safety, the positive and negative electrical connections of the cell and the cell explosion-proof valve are arranged on opposite sides. This design can achieve thermoelectric separation. That is, when the cell explosion-proof valve is opened due to abuse or thermal runaway, the gas and heat inside the cell will not be directly ejected onto the positive and negative electrical connections. This can avoid or mitigate the thermal runaway of a single cell that could lead to thermal runaway of the module or system, thus greatly improving the safety of the cell and the system.

[0003] In the prior art, some batteries have their explosion-proof valves located at the bottom of the casing. For example, Chinese patent document CN222190835U discloses a base plate, a battery cell, a battery, and an electrical device. The base plate includes: a body portion, which includes a first venting area and a second venting area. The first venting area has multiple first venting grooves, and the second venting area has multiple second venting grooves. Both the first and second venting grooves penetrate the body portion; a support portion, which protrudes from the body portion for contacting the casing; and a venting portion, which protrudes from the body portion and surrounds the first venting area. The venting portion has a venting groove.

[0004] Although the bottom plate in the aforementioned patent documents helps with venting through the venting groove structure, the bottom plate structure occupies too much space at the bottom of the battery casing, resulting in insufficient venting efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a grid pad, a lithium battery, and an electrical device to solve the problem that the existing bottom support plate structure occupies too much space at the bottom of the battery casing, resulting in insufficient exhaust efficiency.

[0006] To achieve the above objectives, this utility model provides a grid gasket for placement inside the housing of a battery cell, wherein the bottom housing of the battery cell is provided with an explosion-proof valve; the grid gasket includes a body portion, the body portion having a first surface and a second surface disposed opposite to each other along its thickness direction; the body portion is provided with a main grid hole and a plurality of secondary grid holes, the main grid hole and the secondary grid holes both penetrating the first surface and the second surface; the main grid hole is disposed corresponding to the location of the explosion-proof valve, and the plurality of secondary grid holes surround the periphery of the main grid hole, the space occupied by the main grid hole and the secondary grid holes relative to the body portion is not less than 70%.

[0007] Furthermore, the size of the main grid hole is larger than the size of the explosion-proof valve opening, and the outer contour of the main body is smaller than the outer contour of the bottom of the housing.

[0008] Through the above technical solutions, the main grid hole will not obstruct the explosion-proof valve opening, which facilitates the rapid passage of thermal runaway gas through the grid gasket and its discharge from the explosion-proof valve opening. The outer contour of the main body is smaller than the outer contour of the bottom of the housing, avoiding interference between the main body and the battery housing, and facilitating the assembly of the grid gasket into the battery housing.

[0009] Preferably, the main body includes an outer frame whose shape fits the inner wall of the battery casing; the main grid hole is disposed inside the outer frame, the outer edge of the main grid hole is a rectangular frame, and the four corners of the rectangular frame are connected to the outer frame by a first support arm; a secondary grid hole is disposed between the outer frame and the rectangular frame.

[0010] Through the above technical solutions, the shape of the outer frame ensures stable contact between the main body and the battery casing, thereby improving the support stability of the battery cell and reducing cell shaking. The first arm connects the four corners of the outer edge of the main grid hole to the outer frame, which can improve the structural stability of the main grid hole. The first arm also connects the outer frame 110 and the rectangular frame, forming the secondary grid hole located between the two, which is trapezoidal in shape.

[0011] Preferably, the main body includes an outer frame whose shape conforms to the inner wall of the battery casing; the main grid hole is disposed inside the outer frame, the outer edge of the main grid hole is a rounded rectangular frame, a secondary grid hole with a circular frame is disposed between the arc side of the rounded rectangle and the outer frame, the straight side of the rounded rectangle is connected to the outer frame through a second support arm; the circular frame is spaced apart from the outer frame, and the outer side of the circular frame is connected to the outer frame through a third support arm.

[0012] Through the above technical solutions, the shape of the outer frame ensures stable contact between the main body and the battery casing. The rounded rectangular edges and circular frame increase the structural strength of the edges of the main and secondary grid holes, improving their resistance to deformation. The separation by the second and third arms creates multiple non-circular secondary grid holes, increasing the airflow area and improving exhaust efficiency.

[0013] Furthermore, the outer peripheral edges of the main gate hole and the secondary gate hole protrude toward the second surface.

[0014] Through the above technical solutions, the edges of the main grid hole and the secondary grid hole contact the bottom of the battery casing, lifting the entire grid pad and creating a gap between the second surface of the grid pad and the bottom of the battery casing, increasing the exhaust space and further improving the exhaust efficiency.

[0015] This utility model also provides a lithium battery, including a casing, a cell, and the aforementioned grid pad, wherein the grid pad is disposed between the bottom of the cell and the bottom inner side of the casing.

[0016] This utility model also provides an electrical device, including the aforementioned lithium battery.

[0017] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:

[0018] This invention discloses a grid gasket located between the bottom of the housing and the battery cell, separating the battery cell from the bottom of the housing. This prevents the battery cell from expanding during thermal runaway and compressing the explosion-proof valve at the bottom of the housing, thus blocking the valve and affecting venting efficiency. Both the main grid hole and the auxiliary grid hole penetrate the first and second surfaces, allowing gas generated during thermal runaway to pass through them. The main grid hole is positioned corresponding to the location of the explosion-proof valve, and is radially aligned with the valve opening. This allows the thermal runaway gas to pass through the grid gasket more quickly and exit through the valve opening, resulting in smooth and efficient venting. The main grid hole and auxiliary grid hole occupy at least 70% of the space relative to the main body, representing a large portion of the battery housing's bottom space. This perforation structure provides sufficient venting space, facilitating rapid gas passage through the grid gasket and improving venting efficiency.

[0019] 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

[0020] 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.

[0021] Figure 1 This is a schematic diagram of the structure of the grille gasket in an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the first surface of the grille gasket in an embodiment of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the grille gasket in another embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the first surface of the grid gasket in another embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures

[0026] 100. Main body; 110. Outer frame; 120. Main grid hole; 130. Secondary grid hole; 140. First arm; 150. Second arm; 160. Third arm. Detailed Implementation

[0027] 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.

[0028] Reference Figures 1-4 This embodiment provides a grid gasket for placement inside 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 grid gasket includes a body portion 100, with a first surface and a second surface disposed opposite each other along its thickness direction. The body portion 100 is provided with a main grid hole 120 and multiple secondary grid holes 130, both of which penetrate the first and second surfaces. Gas generated by thermal runaway can pass through the main grid hole 120 and the secondary grid holes 130. The main grid hole 120 is positioned corresponding to the location of the explosion-proof valve, and the main grid hole 120 is radially aligned with the explosion-proof valve opening. Thermal runaway gas can pass through the grid gasket more quickly and be discharged from the explosion-proof valve opening, resulting in smooth and efficient exhaust. Multiple sub-grid holes 130 surround the periphery of the main grid hole 120, and the main grid hole 120 and sub-grid holes 130 occupy no less than 70% of the space of the main body 100. The main grid hole 120 and sub-grid holes 130 occupy most of the space of the main body 100, that is, most of the space at the bottom of the battery casing is occupied by the hole structure, leaving sufficient exhaust space, which is conducive to the rapid passage of gas through the grid gasket and improves exhaust efficiency.

[0029] Understandably, the size of the main grid hole 120 is larger than the size of the explosion-proof valve opening. The main grid hole 120 will not obstruct the explosion-proof valve opening, which is conducive to the rapid passage of thermal runaway gas through the grid gasket and its discharge from the explosion-proof valve opening. The outer contour of the body part 100 is smaller than the outer contour of the bottom of the housing to avoid interference between the body part 100 and the battery housing, and to facilitate the assembly of the grid gasket into the battery housing.

[0030] In some embodiments, such as Figure 1 and Figure 2As shown, the main body 100 includes an outer frame 110. The outer frame 110 is shaped to fit the inner wall of the battery casing, ensuring stable contact between the main body 100 and the battery casing, thereby improving the stability of the battery cell support and reducing cell vibration. A main grid hole 120 is located inside the outer frame 110. The outer edge of the main grid hole 120 is a rectangular frame. First arms 140 connect the four corners of the rectangular frame to the outer frame 110, improving the structural stability of the main grid hole 120. The first arms 140 connect the outer frame 110 and the rectangular frame, forming a secondary grid hole 130 located between them. The secondary grid hole 130 is trapezoidal in shape.

[0031] In some embodiments, the body 100 includes an outer frame 110, the shape of which conforms to the inner wall of the battery casing, ensuring stable contact between the body 100 and the battery casing. A main grid hole 120 is disposed inside the outer frame 110, with its outer edge being a rounded rectangular frame. A secondary grid hole 130 with a circular frame is disposed between the curved edge of the rounded rectangle and the outer frame 110. The straight edge of the rounded rectangle is connected to the outer frame 110 via a second support arm 150. The curved edge of the rounded rectangle and the circular frame increase the structural strength of the edges of the main grid hole 120 and the secondary grid hole 130, improving their resistance to deformation. Furthermore, the circular frame is spaced apart from the outer frame 110, and the outer side of the circular frame is connected to the outer frame 110 via a third support arm 160. The separation by the second support arm 150 and the third support arm 160 forms multiple non-circular secondary grid holes 130, increasing the airflow area and improving exhaust efficiency.

[0032] In some embodiments, the outer peripheral edges of the main grid hole 120 and the secondary grid hole 130 protrude toward the second surface. The second surface faces the bottom of the battery housing, and the edges of the main grid hole 120 and the secondary grid hole 130 contact the bottom of the battery housing, lifting the entire grid pad and creating a gap between the second surface of the grid pad and the bottom of the battery housing, increasing the exhaust space and further improving the exhaust efficiency.

[0033] One aspect of this application provides a lithium battery, including a casing, a battery cell, and the aforementioned grid gasket, wherein the grid gasket is disposed between the bottom of the battery cell and the bottom inner side of the casing. The grid gasket isolates the battery cell from the bottom of the casing, preventing the battery cell from expanding and squeezing the explosion-proof valve at the bottom of the casing during thermal runaway, thus preventing the explosion-proof valve from failing to open and causing the casing to explode, thereby improving the safety of the battery.

[0034] 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 grid gasket or lithium battery, which will not be elaborated here.

[0035] 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.

[0036] 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.

[0037] 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. A grid gasket for placement within the housing of a battery cell, wherein the bottom housing of the battery cell is provided with an explosion-proof valve; the grid gasket includes a body portion (100), wherein the body portion (100) has a first surface and a second surface disposed opposite to each other along its thickness direction; characterized in that, The main body (100) is provided with a main grid hole (120) and a plurality of secondary grid holes (130), both the main grid hole (120) and the secondary grid holes (130) penetrating the first surface and the second surface; the main grid hole (120) is provided corresponding to the location of the explosion-proof valve, and the plurality of secondary grid holes (130) surround the periphery of the main grid hole (120), the main grid hole (120) and the secondary grid holes (130) occupying no less than 70% of the space of the main body (100).

2. The grid gasket according to claim 1, characterized in that, The size of the main grid hole (120) is larger than the size of the explosion-proof valve opening.

3. A grid gasket according to claim 1, characterized in that, The outer contour of the body part (100) is smaller than the outer contour of the bottom of the shell.

4. A grid gasket according to claim 1, characterized in that, The main body (100) includes an outer frame (110), the outer frame (110) having an outer shape that fits the inner wall of the battery casing; the main grid hole (120) is located inside the outer frame (110), the outer edge of the main grid hole (120) is a rectangular frame, and the four corners of the rectangular frame are connected to the outer frame (110) by a first support arm (140).

5. A grid gasket according to claim 4, characterized in that, A secondary grid hole (130) is provided between the outer frame (110) and the rectangular frame.

6. A grid gasket according to claim 1, characterized in that, The main body (100) includes an outer frame (110), the outer frame (110) having an outer shape that fits the inner wall of the battery casing; the main grid hole (120) is located inside the outer frame (110), the outer edge of the main grid hole (120) is a rounded rectangular frame, a secondary grid hole (130) with a circular frame is provided between the arc side of the rounded rectangle and the outer frame (110), and the straight side of the rounded rectangle is connected to the outer frame (110) through a second support arm (150).

7. A grid gasket according to claim 6, characterized in that, The circular frame and the outer frame (110) are spaced apart, and the outer side of the circular frame is connected to the outer frame (110) through a third arm (160).

8. A grid gasket according to claim 1, characterized in that, The outer peripheral edges of the main gate hole (120) and the secondary gate hole (130) protrude toward the second surface.

9. A lithium battery, characterized in that, It includes a housing, a battery cell, and a grid gasket as described in any one of claims 1-8, wherein the grid gasket is disposed between the bottom of the battery cell and the bottom inner side of the housing.

10. An electrical appliance, characterized in that, Including the lithium battery as described in claim 9.

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