A flow guide support, a lithium battery and an electric device

Abstract

The utility model discloses a guide support, lithium cell and electrical equipment belong to lithium cell technical field, guide support is used to install in the inside of battery casing, including support body, the support body includes first support surface and second support surface who sets up oppositely, first support surface is used for supporting the electric core, and the second support surface sets up towards the battery casing inner wall who installs explosion -proof valve, first support surface of support body is provided with main guide groove and secondary guide groove, and secondary guide groove communicates with main guide groove, and main guide groove corresponds with the explosion -proof valve trepanning position, and secondary guide groove extends away from the explosion -proof valve trepanning position. The main guide groove and secondary guide groove of the utility model guide the electrolyte to the position away from the explosion -proof valve trepanning, avoid the electrolyte too much gathering at the explosion -proof valve trepanning position, alleviate the pressure of explosion -proof valve trepanning position pressure relief, reduce the fire risk.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a current guide 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] Therefore, to improve battery safety, existing technologies include batteries with explosion-proof valves installed at the bottom of the battery casing. For example, Chinese patent document CN220544083U discloses a battery and battery pack. The battery includes a battery casing and a cell disposed within the battery casing. The cell has two opposing first surfaces and a second surface surrounding the two first surfaces. The area of ​​the first surface is larger than the area of ​​the second surface. The battery casing includes: a cover plate; a casing component connected to the cover plate. The casing component includes a side wall and a bottom wall, which are connected. The side wall includes a first side wall opposite to the first surface, and the difference in wall thickness between the bottom wall and the first side wall is 0.01 mm to 1.5 mm.

[0004] Although the explosion-proof valve in the aforementioned patent documents is located at the bottom of the housing, when the battery cell thermally runs away and opens the valve, in addition to gas, electrolyte is also sprayed out from the explosion-proof valve port. The electrolyte may accumulate at the explosion-proof valve port and be sprayed out in a concentrated manner, increasing the risk of fire. Utility Model Content

[0005] The purpose of this invention is to provide a flow guide bracket, a lithium battery, and electrical equipment to solve the problem in the prior art where, in addition to gas, electrolyte is also sprayed out from the explosion-proof valve port when the cell thermally runs away and the valve is opened. The electrolyte may accumulate at the explosion-proof valve port and be sprayed out in a concentrated manner, increasing the risk of fire.

[0006] To achieve the above objectives, this utility model provides a flow guide bracket for installation inside a battery casing. The bracket body includes a bracket body comprising a first support surface and a second support surface disposed opposite to each other. The first support surface supports the battery cell, and the second support surface faces the inner wall of the battery casing where an explosion-proof valve is installed. The first support surface of the bracket body is provided with a main flow channel and a secondary flow guide channel. The secondary flow guide channel communicates with the main flow channel. The main flow channel corresponds to the opening position of the explosion-proof valve, and the secondary flow guide channel extends away from the opening position of the explosion-proof valve.

[0007] Furthermore, multiple secondary guide channels are provided, and when viewed from the direction perpendicular to the first support surface, the multiple secondary guide channels are arranged to radiate outward from the main guide channel as the center.

[0008] Through the above technical solutions, multiple secondary guide channels divert the electrolyte received by the main guide channel to the surrounding area of ​​the explosion-proof valve opening through a divergent manner. The increased guide path greatly reduces the pressure relief at the explosion-proof valve opening and improves the guide efficiency.

[0009] Furthermore, the support body includes two cross-arranged support arms, and a transition plate is provided at the intersection of the two support arms, with the main flow channel located on the transition plate; each support arm has a secondary flow channel along its length.

[0010] Through the above technical solutions, the cross structure can increase the structural strength of the support body and improve the stability of the battery cell support. Moreover, the cross structure has no solid gaps, so it does not obstruct exhaust, which is beneficial to improving gas discharge efficiency. The transition plate can increase the connection strength at the intersection of the two support arms and can also serve as a support for the battery cell, providing a larger support area and improving support stability. The transition plate has more space, which helps to increase the volume of the main flow channel, increase the flow rate, and further reduce the pressure relief at the explosion-proof valve opening. The secondary flow channel guides the electrolyte along the length of the support arm, thus moving it away from the explosion-proof valve opening.

[0011] Furthermore, the width of the transition plate projected onto the first support surface is greater than the width of the support arm projected onto the first support surface. The transition plate can have a relatively large size, providing good support stability.

[0012] Furthermore, each of the support arms is connected to a bracket end plate at both ends, and the bracket end plate is provided with a plurality of diversion grooves, which are connected to the secondary diversion grooves.

[0013] Through the above technical solutions, the end plate of the bracket can share the load-bearing pressure of the support arm, improve the support stability of the bracket body, and the diversion channel can disperse and export the electrolyte that flows from the secondary diversion channel.

[0014] Furthermore, a plurality of the diversion channels are spaced apart and a diversion block is provided between two adjacent diversion channels. The diversion block protrudes toward the first support surface, and the top surface of the diversion block is flush with the first support surface.

[0015] Through the above technical solutions, the shunt block can make the boundaries of the shunt channels clear, and the position of the shunt block can determine the width of the shunt channels. When the widths of the shunt channels are equal, it helps to distribute the electrolyte evenly. The shunt block is flush with the first support surface, which can maintain the flatness of the first support surface of the bracket body and improve the stability of supporting the battery cell.

[0016] Furthermore, the bottom surface of the bracket end plate is provided with a support foot, the end of which contacts the inner wall of the battery housing explosion-proof valve; the support arm creates a gap with the inner wall of the battery housing through the support foot.

[0017] Through the above technical solutions, the support arm creates a gap between the support leg and the bottom inner wall of the battery casing, increasing the venting space and improving the venting efficiency of the battery in the event of runaway.

[0018] 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 flow guide bracket is installed on the inner side of the bottom of the casing.

[0019] This utility model also provides an electrical device, including the aforementioned lithium battery.

[0020] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:

[0021] This utility model discloses a flow guide bracket. The first support surface supports the battery cell, serving as a carrier to support the cell and allowing for venting and pressure relief space between the cell and the inner wall of the battery casing equipped with the explosion-proof valve. This improves the pressure relief efficiency of the battery during thermal runaway. The main flow channel can collect a portion of the electrolyte ejected during battery thermal runaway, and the secondary flow guide channel directs the electrolyte away from the explosion-proof valve opening, preventing excessive electrolyte accumulation at the opening and reducing the pressure at the valve opening, thus lowering the risk of fire.

[0022] 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

[0023] 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.

[0024] Figure 1 This is a three-dimensional structural schematic diagram (I) of the flow guide bracket in this utility model embodiment;

[0025] Figure 2 This is a projected structural diagram of the first support surface of the flow guide bracket in this embodiment of the utility model;

[0026] Figure 3 This is a projected structural diagram of the second support surface of the flow guide bracket in this embodiment of the utility model;

[0027] Figure 4 This is a three-dimensional structural schematic diagram (II) of the flow guide bracket in this utility model embodiment;

[0028] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0029] Explanation of reference numerals in the attached figures

[0030] 100. Support body; 110. Support arm; 120. Support end plate; 121. Diverter channel; 122. Support leg; 123. Diverter block; 130. Transition plate; 140. Main diverter channel; 150. Secondary diverter channel. 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 1-5 This embodiment provides a flow guide bracket for installation inside a battery casing. The bracket body 100 includes a first support surface and a second support surface disposed opposite to each other. The first support surface supports the battery cell, and the second support surface faces the inner wall of the battery casing where an explosion-proof valve is installed. Specifically, the first support surface is the top surface, and the second support surface is the bottom surface. The explosion-proof valve is installed at the bottom of the battery casing. The bottom explosion-proof valve serves as a redundant design, providing a second pressure relief channel to ensure rapid gas discharge when the top valve is blocked. The first support surface of the bracket body 100 is provided with a main flow channel 140 and a secondary flow guide channel 150. The secondary flow guide channel 150 communicates with the main flow channel 140, and the main flow channel 140 corresponds to the opening position of the explosion-proof valve. The secondary flow guide channel 150 extends away from the opening position of the explosion-proof valve. In the event of battery thermal runaway, electrolyte is also ejected along with the gas. The main flow channel 140 can collect a portion of the electrolyte, while a portion of the electrolyte concentrated at the explosion-proof valve opening is guided away from the opening via the secondary flow channel 150. This prevents excessive electrolyte accumulation at the explosion-proof valve opening, reduces the pressure at the opening, and lowers the risk of fire. It is understood that the electrolyte guided by the main flow channel 140 and the secondary flow channel 150 is primarily the electrolyte located above the support body 100. Simultaneously, it can also guide the gas above, causing the electrolyte and gas to disperse towards the edge along the secondary flow channel 150, preventing concentration at the explosion-proof valve opening.

[0033] It should be noted that the bracket body 100 is injection molded and made of hard, heat-resistant plastic, which has the advantages of simple process, light weight and easy assembly.

[0034] To improve flow guiding efficiency, in a preferred embodiment, multiple secondary flow guiding channels 150 are provided. Viewed from the direction perpendicular to the first support surface, the multiple secondary flow guiding channels 150 are arranged radiating outwards from the main flow guiding channel 140 as the center. The main flow guiding channel 140 corresponds to the opening position of the explosion-proof valve. The electrolyte received by the main flow guiding channel 140 is guided to the surrounding area of ​​the explosion-proof valve opening position in a radiating manner. The increased flow guiding path greatly reduces the pressure relief at the explosion-proof valve opening position.

[0035] In some embodiments, such as Figure 1 and Figure 2 As shown, the support body 100 includes two intersecting support arms 110. The intersecting structure increases the structural strength of the support body 100 and improves the stability of the battery cell support. Furthermore, the intersecting structure has no solid gaps, which does not obstruct exhaust and improves gas discharge efficiency. A transition plate 130 is provided at the intersection of the two support arms 110. The transition plate 130 increases the connection strength at the intersection of the two support arms 110 and also serves as a support for the battery cell, providing a larger support area and improving support stability. The main flow channel 140 is located on the transition plate 130, which has a larger space, helping to increase the volume of the main flow channel 140. Each support arm 110 has a secondary flow channel 150 along its length, extending towards the four corners of the bottom inner wall of the battery casing. The secondary flow channels 150 guide the electrolyte to the four corners, away from the explosion-proof valve opening. Furthermore, the width of the transition plate 130 projected onto the first support surface is greater than the width of the support arm 110 projected onto the first support surface. The transition plate 130 has a sufficiently large size to provide good support stability.

[0036] In some embodiments, such as Figure 2 and Figure 5 As shown, each support arm 110 has a support end plate 120 connected to both ends. The support end plate 120 can share the load-bearing pressure of the support arm 110, improving the support stability of the support body 100. The support end plate 120 is provided with several diversion channels 121, which are connected to the secondary guide channel 150. The diversion channels 121 can disperse and discharge the electrolyte flowing from the secondary guide channel 150. Specifically, in this embodiment, three diversion channels 121 are provided, spaced apart, with a diversion block 123 between adjacent diversion channels 121. There are two diversion blocks 123. Furthermore, the spacing of the diversion blocks 123 is uniform, which makes the width of the three diversion channels 121 equal, contributing to uniform electrolyte distribution.

[0037] It is understandable that the shunt block 123 is protruding towards the first support surface, and the top surface of the shunt block 123 is flush with the first support surface, so as to maintain the flatness of the first support surface of the bracket body 100 and improve the support stability of the battery cell.

[0038] In some embodiments, such as Figure 4 and Figure 5 As shown, the bottom surface of the bracket end plate 120 is provided with a support leg 122. The end of the support leg 122 contacts the inner wall where the explosion-proof valve of the battery housing is located. The support arm 110 creates a gap with the inner wall of the battery housing through the support leg 122, which increases the exhaust space and improves the exhaust efficiency of the battery when it runs away.

[0039] 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. A flow guide bracket is installed on the inner side of the bottom of the casing. The flow guide bracket supports the battery cell. When the battery experiences thermal runaway, the main flow channel 140 and the secondary flow channel 150 on the flow guide bracket guide the electrolyte, thereby reducing the risk of battery combustion.

[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 current guide bracket or lithium battery, which will not be repeated 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. A flow guide bracket for installation inside a battery casing, comprising a bracket body (100), the bracket body (100) including a first support surface and a second support surface disposed opposite to each other, the first support surface being for supporting a battery cell, and the second support surface being disposed toward the inner wall of the battery casing on which an explosion-proof valve is installed; characterized in that, The first support surface of the bracket body (100) is provided with a main flow channel (140) and a secondary flow channel (150). The secondary flow channel (150) is connected to the main flow channel (140). The main flow channel (140) corresponds to the opening position of the explosion-proof valve. The secondary flow channel (150) extends away from the opening position of the explosion-proof valve.

2. The flow guide bracket according to claim 1, characterized in that, Multiple secondary guide channels (150) are provided. When viewed from the direction perpendicular to the first support surface, the multiple secondary guide channels (150) are arranged to radiate outward from the main guide channel (140) as the center.

3. A flow guide bracket according to claim 1, characterized in that, The support body (100) includes two cross-arranged support arms (110), and a transition plate (130) is provided at the intersection of the two support arms (110). The main flow channel (140) is located on the transition plate (130). Each support arm (110) has a secondary flow channel (150) along its length.

4. A flow guide bracket according to claim 3, characterized in that, The width of the projection of the transition plate (130) onto the first support surface is greater than the width of the projection of the support arm (110) onto the first support surface.

5. A flow guide bracket according to claim 3, characterized in that, Each of the support arms (110) is connected to a bracket end plate (120) at both ends. The bracket end plate (120) is provided with a plurality of diversion grooves (121), and the plurality of diversion grooves (121) are connected to the secondary guide grooves (150).

6. A flow guide bracket according to claim 5, characterized in that, A plurality of the aforementioned diversion channels (121) are arranged at intervals, and a diversion block (123) is provided between two adjacent diversion channels (121).

7. A flow guide bracket according to claim 6, characterized in that, The diverting block (123) protrudes towards the first support surface, and the top surface of the diverting block (123) is flush with the first support surface.

8. A flow guide bracket according to claim 5, characterized in that, The bottom surface of the bracket end plate (120) is provided with a support foot (122), and the end of the support foot (122) is in contact with the inner wall of the battery housing explosion-proof valve; the support arm (110) creates a gap with the inner wall of the battery housing through the support foot (122).

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, The flow guide bracket according to any one of claims 1-8 is installed on 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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