Exhaust bracket, lithium battery and electric device

Abstract

The utility model discloses an exhaust support, lithium battery and electrical equipment belong to lithium battery technical field, and exhaust support includes support body, and the top surface of support body is used for bearing the electric core, and the bottom surface is set up towards the bottom surface of battery shell of explosion -proof valve, support body includes two cross -setting support arm, and the bottom surface of every support arm is provided with a plurality of support feet, and the bottom surface of every support arm is formed the gap between support foot and the inside bottom surface of battery shell, and the inside bottom surface of battery shell is contacted, and the bottom surface of every support arm is formed the gap between support foot and the inside bottom surface of battery shell. Lithium battery, including shell and electric core, the electric core is encapsulated in shell, and the bottom of shell is provided with explosion -proof valve, and the bottom inside of shell is installed above -mentioned exhaust support. The utility model can reduce the occupation of support to the inside space of battery, increase exhaust space, improve exhaust efficiency.

Description

Technical Field

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

[0002] During thermal runaway of a lithium battery, the flammable gases (such as CO, H2, CH4, etc.) produced by electrolyte decomposition have extremely high temperatures and low densities, naturally accumulating upwards. If the explosion-proof valve is only located at the top, the high-temperature gas may clog the valve body due to limited space at the top or cell expansion, leading to delayed pressure relief or even failure. A bottom-mounted explosion-proof valve can serve as a redundant design, providing a second pressure relief channel in case the top valve body is blocked, ensuring rapid gas discharge.

[0003] 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 that penetrate along a second direction Y to connect the first groove and the second groove. The first direction X intersects with the second direction Y.

[0004] However, the support member in this patent document is set at the bottom inside the battery casing through the first connecting plate and the second connecting plate. As a support member for the battery cell, it is large in size and has more contact with the bottom of the battery casing, which will occupy more venting space and affect the battery venting efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide an exhaust bracket, a lithium battery, and electrical equipment to solve the problem that in the prior art, the internal cell support component of the battery with the explosion-proof valve installed at the bottom is large in size and has a lot of contact with the bottom of the battery casing, which occupies a lot of exhaust space and affects the battery exhaust efficiency.

[0006] To achieve the above objectives, this utility model provides an exhaust bracket, including a bracket body. The top surface of the bracket body is used to support the battery cell, and the bottom surface faces the bottom surface of the battery casing equipped with an explosion-proof valve. The bracket body includes two cross-arranged support arms, each of which is provided with an exhaust hole. The bottom surface of each support arm is provided with several support feet, which are in contact with the inner bottom surface of the battery casing. A gap is formed between the bottom surface of each support arm and the inner bottom surface of the battery casing through the support feet.

[0007] Furthermore, both ends of the support arm are provided with support end plates, and the support legs are connected to the bottom surface of the support end plates. The bottom surface area of ​​the support end plates is larger than the cross-sectional area of ​​the support legs, and the support legs are cylindrical or prismatic.

[0008] Through the above technical solutions, the bracket end plate can improve the support stability of the battery cell. The bottom area of ​​the bracket end plate is larger than the cross-sectional area of ​​the support leg, and the bracket end plate has a relatively larger support area, which helps to distribute the lifting force of the entire support arm on the battery cell, thereby improving stability. The support leg is cylindrical or prismatic, which is easy to process while ensuring support strength.

[0009] Furthermore, the bottom surface of the bracket end plate is flush with, lower than or higher than the bottom surface of the support arm.

[0010] Through the above technical solutions, the bracket end plate and support arm can be processed into various structural forms to adapt to different internal battery environments. The bottom surface of the bracket end plate is flush with the bottom surface of the support arm, making it easier to process and assemble. The bottom surface of the bracket end plate being higher or lower than the bottom surface of the support arm is a design choice to avoid these overlaps, allowing for more efficient use of the space inside the battery casing.

[0011] Furthermore, the exhaust passage includes a main passage and secondary passages. The position of the main passage is radially aligned with the position of the explosion-proof valve opening. The size of the main passage is larger than, smaller than, or equal to the size of the explosion-proof valve opening. Multiple secondary passages are provided and are arranged at intervals along the length of the support arm.

[0012] Through the above technical solutions, the size and position of the main through hole can ensure smoother exhaust. The secondary through holes are distributed in a matrix on the support arm, which can increase the exhaust channel while ensuring the strength of the support arm, so that the gas can quickly pass through the support arm in case of thermal runaway and be quickly discharged from the explosion-proof valve through hole.

[0013] Furthermore, a ring is provided at the intersection of the two support arms, and the main through hole is located in the inner circle of the ring.

[0014] Through the above technical solutions, the circular ring can increase the supporting area of ​​the battery cell at the intersection of the two support arms, thereby improving the stability of the battery cell under load. The circular ring and the two support arms are integrally formed, resulting in good structural strength and simple processing.

[0015] This utility model also provides a lithium battery, including a casing and a battery cell, wherein the battery cell is encapsulated in the casing, and an explosion-proof valve is provided at the bottom of the casing; the aforementioned exhaust bracket is installed on the inner side of the bottom of the casing, and the bracket body is lifted by contacting the inner side of the bottom of the casing with the bracket legs.

[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 utility model discloses an exhaust bracket that uses two intersecting arms to form a support structure for the battery cell. Compared to traditional connecting plates, these arms are smaller and occupy less exhaust space. Furthermore, the intersecting structure ensures stability while the lack of a physical cross-section between the arms further reduces the space required for exhaust. The arms lift the bracket body via support legs, creating a gap between the bracket body and the bottom surface of the battery casing, increasing exhaust space and improving exhaust efficiency in the event of battery runaway.

[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 three-dimensional structural schematic diagram (I) of the exhaust bracket in an embodiment of this utility model;

[0022] Figure 2 This is a three-dimensional structural schematic diagram (II) of the exhaust bracket in this utility model embodiment;

[0023] Figure 3 This is a schematic diagram of the top projection structure of the exhaust bracket in an embodiment of this utility model;

[0024] Figure 4 This is a schematic diagram of the bottom projection structure of the exhaust bracket in an embodiment of this utility model.

[0025] Explanation of reference numerals in the attached figures

[0026] 100. Bracket body; 110. Support arm; 111. Support leg; 112. Bracket end plate; 113. Ring; 114. Main through hole; 115. Secondary through hole. 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 1-4This embodiment provides an exhaust bracket for use in lithium batteries with bottom-mounted explosion-proof valves. The bottom explosion-proof valve of the lithium battery can be used as a redundant design, providing a second pressure relief channel when the top valve is blocked, ensuring rapid gas discharge. The exhaust bracket includes a bracket body 100. The top surface of the bracket body 100 supports the battery cell, and the bottom surface faces the bottom surface of the battery casing with the explosion-proof valve. The top and bottom surfaces of the bracket body 100 are positioned opposite each other. The bracket body 100 includes two intersecting support arms 110, each with an exhaust port. The two intersecting support arms 110 form a support structure for the battery cell. Compared to traditional connecting plates, the support arms 110 have a smaller volume and occupy less exhaust space. Moreover, the intersecting structure ensures stability while the lack of a physical intersecting gap between the support arms 110 further reduces the space occupied for exhaust. The exhaust ports allow gas generated during thermal runaway to pass through quickly, increasing the exhaust rate. Each support arm 110 has several feet 111 on its bottom surface. The feet 111 contact the bottom surface of the battery casing, and a gap is formed between the bottom surface of each support arm 110 and the bottom surface of the battery casing through the feet 111. The feet 111 lift the support body 100, creating a gap between the support body 100 and the bottom surface of the battery casing, increasing the venting space and improving the venting efficiency of the battery in the event of a runaway.

[0029] To improve the stability of the support arm 110 for the battery cell, such as Figure 1 and Figure 2 As shown, support end plates 112 are provided at both ends of the support arm 110 along its length, and support legs 111 are connected to the bottom surface of the support end plates 112. The bottom surface area of ​​the support end plates 112 is larger than the cross-sectional area of ​​the support legs 111, giving the support end plates 112 a relatively larger supporting area. This helps to distribute the lifting force of the entire support arm 110 on the battery cell, thereby improving stability. The support end plates 112 and the support arm 110 are an integral structure, ensuring the rigidity of the structure.

[0030] Furthermore, the bottom surface of the bracket end plate 112 is flush with, lower than, or higher than the bottom surface of the support arm 110. When the bottom surface of the bracket end plate 112 is flush with the bottom surface of the support arm 110, it is easier to process and assemble, which is the preferred structure in this embodiment. When the bottom surface of the bracket end plate 112 is lower than or higher than the bottom surface of the support arm 110, the internal space of the battery casing can be utilized more effectively. It should be noted that the support leg 111 is cylindrical or prismatic, which provides a certain structural strength while facilitating processing.

[0031] In some embodiments, such as Figure 3 and Figure 4As shown, the exhaust passage includes a main passage 114 and a secondary passage 115. The position of the main passage 114 is radially aligned with the position of the explosion-proof valve opening. The size of the main passage 114 is larger than, smaller than, or equal to the size of the explosion-proof valve opening, which facilitates smoother exhaust. Multiple secondary passages 115 are provided and arranged at intervals along the length of the support arm 110. This increases the exhaust channel while ensuring the strength of the support arm 110, allowing gas to quickly pass through the support arm 110 and be quickly discharged from the explosion-proof valve opening in the event of thermal runaway.

[0032] Furthermore, a circular ring 113 is provided at the intersection of the two support arms 110, with the main through hole 114 located within the inner circle of the circular ring 113. The circular ring 113 increases the support area of ​​the battery cell at the intersection of the two support arms 110, thereby improving the stability of the battery cell under load. It should be noted that the circular ring 113, the support arms 110, the bracket end plate 112, and the support legs 111 are all integrally formed, which helps to reduce the complexity of the manufacturing process.

[0033] One aspect of this application provides a lithium battery, including a casing and a battery cell. The battery cell is encapsulated in the casing, and an explosion-proof valve is provided at the bottom of the casing. In the event of thermal runaway, the internal material of the battery cell may melt and block the top explosion-proof valve. The bottom explosion-proof valve is less likely to be covered by molten material due to gravity, thus improving reliability. An exhaust bracket is installed on the inner bottom side of the casing, and the support leg 111 contacts the inner bottom side of the casing to lift the bracket body 100. There is an exhaust space between the exhaust bracket and the inner bottom wall of the battery casing, which facilitates the efficient discharge of thermal runaway gases and increases battery safety.

[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 exhaust bracket 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. An exhaust bracket, comprising a bracket body (100), wherein the top surface of the bracket body (100) is used to support a battery cell, and the bottom surface is disposed facing the bottom surface of a battery casing equipped with an explosion-proof valve; characterized in that, The support body (100) includes two cross-arranged support arms (110), each of which is provided with an exhaust vent; each of the support arms (110) has a plurality of legs (111) on its bottom surface, the legs (111) contacting the bottom surface of the battery casing, and a gap is formed between the bottom surface of each support arm (110) and the bottom surface of the battery casing through the legs (111).

2. The exhaust bracket according to claim 1, characterized in that, Both ends of the arm (110) along its length are provided with bracket end plates (112), and the legs (111) are connected to the bottom surface of the bracket end plates (112).

3. The exhaust bracket according to claim 2, characterized in that, The bottom surface of the bracket end plate (112) is flush with, lower than or higher than the bottom surface of the support arm (110).

4. An exhaust bracket according to claim 2, characterized in that, The bottom area of ​​the bracket end plate (112) is larger than the cross-sectional area of ​​the support leg (111).

5. An exhaust bracket according to claim 4, characterized in that, The support (111) is cylindrical or prismatic.

6. An exhaust bracket according to claim 1, characterized in that, The exhaust passage includes a main passage (114) and a secondary passage (115). The position of the main passage (114) is radially aligned with the position of the explosion-proof valve opening. Multiple secondary passages (115) are provided and are arranged at intervals along the length direction of the support arm (110).

7. An exhaust bracket according to claim 6, characterized in that, The size of the main through hole (114) is greater than, less than or equal to the size of the explosion-proof valve opening.

8. An exhaust bracket according to claim 6, characterized in that, A ring (113) is provided at the intersection of the two support arms (110), and the main through hole (114) is located in the inner circle of the ring (113).

9. A lithium battery, comprising a casing and a battery cell, wherein the battery cell is encapsulated in the casing, and an explosion-proof valve is provided at the bottom of the casing; characterized in that, An exhaust bracket as described in any one of claims 1-8 is installed on the bottom inner side of the housing, and the bracket body (100) is lifted by contacting the bottom inner side of the housing with the bracket leg (111).

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

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