A casing and a battery

Abstract

This utility model belongs to the field of battery technology and discloses a housing and a battery. The housing includes a housing body and a pressure relief assembly. The pressure relief assembly includes a first pressure relief valve and a second pressure relief valve, both of which are disposed on the side wall of the housing body. The first pressure relief valve includes a first groove, and the second pressure relief valve includes a second groove. In the thickness direction of the housing body, the projection of the first groove of the same pressure relief assembly is located inside the projection of the second groove. The opening pressure of the first pressure relief valve is less than the opening pressure of the second pressure relief valve. Thus, when the gas generation rate inside the battery is low, the opening of the first pressure relief valve can achieve slow pressure relief. When the gas generation rate inside the battery is high, the opening of the second pressure relief valve can promptly discharge a large amount of gas to the outside, achieving multi-stage pressure relief, making the pressure relief method more flexible, improving the pressure relief effect, and timely releasing the internal pressure of the battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a casing and a battery. Background Technology

[0002] A battery is a device that converts chemical energy into electrical energy, and it is widely used in electronic devices, vehicles, energy storage systems and other fields.

[0003] A battery consists of a casing, a cover, and battery cells. The battery cells are located inside the casing, and the cover is fixedly connected to the casing. The casing or cover is usually equipped with an explosion-proof valve so that when the pressure inside the battery rises sharply due to overcharging, short circuit, high temperature, or other reasons, the gas inside the battery can be released to the outside in a timely manner through the explosion-proof valve.

[0004] However, due to the different rates of increase in battery pressure and the different rates of gas production, when facing complex pressure scenarios, a single explosion-proof valve may open prematurely during slow pressure increases or fail to release a large amount of gas in a short time during rapid pressure increases. The single pressure relief method and poor pressure relief effect may lead to damage to the battery structure or performance degradation, affecting the safety of the battery. Utility Model Content

[0005] The purpose of this invention is to provide a housing and a battery to solve the problem that the explosion-proof valve installed on the battery has a single pressure relief method and poor pressure relief effect.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, a housing includes: a housing body; and a pressure relief assembly, the pressure relief assembly including a first pressure relief valve and a second pressure relief valve, both the first pressure relief valve and the second pressure relief valve being disposed on the side wall of the housing body, the first pressure relief valve including a first groove, the second pressure relief valve including a second groove, and in the thickness direction of the housing body, the projection of the first groove of the pressure relief assembly in the same group is located inside the projection of the second groove, and the opening pressure of the first pressure relief valve is less than the opening pressure of the second pressure relief valve.

[0008] Preferably, the first groove is C-shaped or square-shaped; and / or, the second groove is C-shaped or square-shaped.

[0009] Preferably, the axis of symmetry of the first groove coincides with the axis of symmetry along the length of the housing body; and / or, the axis of symmetry of the second groove coincides with the axis of symmetry along the length of the housing body.

[0010] Preferably, the opening direction of the first pressure relief valve in the same pressure relief assembly is opposite to the opening direction of the second pressure relief valve.

[0011] Preferably, the pressure relief assembly is provided in two sets, and the two sets of pressure relief assemblies are symmetrically arranged on the side wall of the housing body.

[0012] Preferably, the first pressure relief valve further includes a first connecting portion connected to the end of the first groove, and the second pressure relief valve further includes a second connecting portion connected to the end of the second groove.

[0013] Preferably, the first connecting portion and the second groove of the pressure relief assembly in the same group are spaced apart.

[0014] Preferably, the width of the first connecting portion is smaller than the width of the side of the first groove away from the first connecting portion.

[0015] Preferably, the ends of the second grooves of the two sets of pressure relief components that are away from the second connection portion are arranged to overlap, or the ends of the second grooves of the two sets of pressure relief components that are away from the second connection portion are spaced apart.

[0016] In a second aspect, a battery includes a cell, a cover plate, and a housing as described above, wherein the cell is disposed inside the housing, and the cover plate is connected to the housing.

[0017] The beneficial effects of this utility model are:

[0018] A housing includes a housing body and a pressure relief assembly. The pressure relief assembly includes a first pressure relief valve and a second pressure relief valve. Both the first and second pressure relief valves are disposed on the side wall of the housing body. The first pressure relief valve includes a first groove, and the second pressure relief valve includes a second groove. In the thickness direction of the housing body, the projection of the first groove of the same pressure relief assembly is located inside the projection of the second groove. The opening pressure of the first pressure relief valve is less than the opening pressure of the second pressure relief valve.

[0019] Thus, with the first groove located inside the second groove and the first pressure relief valve being smaller, the first pressure relief valve opens first and slowly releases pressure when the gas generation rate inside the battery is low. When the gas generation rate inside the battery is high, the second pressure relief valve opens and increases the pressure relief area to achieve rapid pressure relief. This makes the pressure relief method more flexible, improves the pressure relief effect, releases the internal pressure of the battery in a timely manner, and reduces damage to the battery structure and fatigue damage to materials. Even if one fails, the other can continue to work, improving battery safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the shell structure in one embodiment of the present invention;

[0021] Figure 2 This is a bottom view of the housing in one embodiment of the present invention.

[0022] In the picture:

[0023] 1. Housing body; 2. Pressure relief assembly; 21. First pressure relief valve; 211. First groove; 212. First connecting part; 22. Second pressure relief valve; 221. Second groove; 222. Second connecting part. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0028] See Figure 1and Figure 2 This utility model provides a housing, including a housing body 1 and a pressure relief assembly 2. The pressure relief assembly 2 includes a first pressure relief valve 21 and a second pressure relief valve 22. Both the first pressure relief valve 21 and the second pressure relief valve 22 are disposed on the side wall of the housing body 1. The first pressure relief valve 21 includes a first groove 211, and the second pressure relief valve 22 includes a second groove 221. In the thickness direction of the housing body 1, the projection of the first groove 211 of the same pressure relief assembly 2 is located inside the projection of the second groove 221. The opening pressure of the first pressure relief valve 21 is less than the opening pressure of the second pressure relief valve 22.

[0029] In this embodiment, the housing body 1 is made of aluminum material and is a hollow and open cuboid structure. The first pressure relief valve 21 and the second pressure relief valve 22 are both disposed on the side wall of the housing body 1 away from the opening. The longitudinal cross-sectional shape of the first groove 211 and the second groove 221 is an inverted trapezoid. The cross-sectional area of ​​the first pressure relief valve 21 is smaller than that of the second pressure relief valve 22.

[0030] Thus, the first groove 211 is located inside the second groove 221, and the cross-sectional area of ​​the first pressure relief valve 21 is small. This allows the first pressure relief valve 21 to open first and release pressure when the gas generation rate inside the battery is low, making full use of the space on the side wall of the housing body 1. When the gas generation rate inside the battery is high, the second pressure relief valve 22 opens and increases the pressure relief area to achieve rapid pressure relief. By setting the first pressure relief valve 21 and the second pressure relief valve 22 with different opening pressures, the pressure relief method can be more flexible, the pressure relief effect can be improved, the internal pressure of the battery can be released in time, and the damage to the battery structure and fatigue damage to the materials can be reduced. Even if one of the first pressure relief valve 21 and the second pressure relief valve 22 fails, the other can continue to work, improving the safety of the battery.

[0031] It is understandable that the first pressure relief valve 21 and the second pressure relief valve 22 can also be installed on other side walls. The installation positions of the first pressure relief valve 21 and the second pressure relief valve 22 can be adjusted according to actual needs, and will not be listed in detail here.

[0032] See Figure 2 In some embodiments, the first groove 211 and the second groove 221 are both C-shaped. Thus, when gas is generated inside the battery, the C-shaped first pressure relief valve 21 and second pressure relief valve 22 can open quickly. At low gas production rates, the first pressure relief valve 21 can achieve precise, small-flow pressure relief; at high gas production rates, the second pressure relief valve 22 can open as the pressure increases, forming a pressure relief channel with a larger flow rate, achieving rapid pressure relief and improving the stability and reliability of staged pressure relief.

[0033] Alternatively, in some embodiments, the first score groove 211 has a "square" shape, and the second score groove 221 also has a "square" shape.

[0034] It can be understood that the shapes of the first score groove 211 and the second score groove 221 can also be racetrack shape, rectangle, or other shapes. The shape of the first score groove 211 and the shape of the second score groove 221 can be the same or different, as long as they can enable the first pressure relief valve 21 and the second pressure relief valve 22 to discharge gas in time after reaching the valve opening pressure, which will not be enumerated in excess herein.

[0035] Referring to Figure 2 , in some embodiments, the symmetry axis of the first score groove 211 coincides with the symmetry axis of the housing body 1 in the length direction, and the symmetry axis of the second score groove 221 coincides with the symmetry axis of the housing body 1 in the length direction.

[0036] Further, in some embodiments, the first score groove 211 is spaced apart from the edge of the housing body 1, the opening direction of the first score groove 211 faces one end portion of the housing body 1 in the length direction, and the opening of the second score groove 221 faces the other end portion of the housing body 1 in the length direction. That is, the opening direction of the first pressure relief valve 21 and the opening direction of the second pressure relief valve 22 in the same group of pressure relief assemblies 2 are opposite.

[0037] In this way, the first pressure relief valve 21 and the second pressure relief valve 22 can be opened in different directions, and the gas inside the battery can be discharged in different directions, which reduces mutual interference between gas flows, improves the pressure relief effect and achieves rapid pressure relief. In addition, it can improve the structural strength at the opening of the first pressure relief valve 21 (i.e., the position where the first score groove 211 is formed) and the opening of the second pressure relief valve 22 (i.e., the position where the second score groove 221 is formed), which can more uniformly disperse the stress on the housing body 1 during the pressure relief process, reduce local structural damage and material fatigue, and improve the safety of the battery.

[0038] It can be understood that the opening directions of the first score groove 211 and the second score groove 221 can be adjusted according to actual requirements, which will not be repeated herein.

[0039] Referring to Figure 1 , in some embodiments, two groups of pressure relief assemblies 2 are provided, and the two groups of pressure relief assemblies 2 are symmetrically arranged on the side wall of the housing body 1.

[0040] In this embodiment, each group of pressure relief assemblies 2 includes one first pressure relief valve 21 and one second pressure relief valve 22. The two groups of pressure relief assemblies 2 are symmetrically arranged along the symmetry axis in the width direction of the side wall of the housing body 1, and the corresponding first pressure relief valves 21 in the two groups of pressure relief assemblies 2 have the same shape, and the corresponding second pressure relief valves 22 have the same shape.

[0041] Thus, by setting two sets of symmetrical pressure relief components 2, the pressure relief on both sides of the casing body 1 can be uniform, avoiding the imbalance of the casing force caused by pressure relief on one side, reducing structural damage and performance degradation of the battery, and enabling both sets of pressure relief components 2 to achieve staged pressure relief synchronously under different gas production rates, making the pressure relief method more flexible and improving the pressure relief effect.

[0042] It is understandable that the shapes of the first pressure relief valve 21 and the second pressure relief valve 22 of the two sets of pressure relief components 2 may also be different. For example, the lengths and widths of the two first pressure relief valves 21 and the two corresponding second pressure relief valves 22 of the two sets of pressure relief components 2 may be different. The end of the second groove 221 may be flush with the side wall edge of the housing body 1 or may be spaced apart from the side wall edge of the housing body 1. The specific dimensions and shapes of the first pressure relief valve 21 and the second pressure relief valve 22 can be adjusted according to actual needs, which will not be elaborated here.

[0043] See Figure 1 In some embodiments, the first pressure relief valve 21 further includes a first connecting portion 212, which is connected to the end of the first groove 211, and the second pressure relief valve 22 further includes a second connecting portion 222, which is connected to the end of the second groove 221.

[0044] In this embodiment, the first connecting part 212 and the first groove 211 enclose to form a first pressure relief valve 21, and the second connecting part 222 and the second groove 221 enclose to form a second pressure relief valve 22. When the gas pressure inside the battery is greater than the opening pressure of the first pressure relief valve 21, the first groove 211 breaks and forms a pressure relief channel for gas to pass through. The first pressure relief valve 21 is bent at the position of the first connecting part 212 to realize the communication between the inside of the housing body 1 and the outside. Similarly, when the gas pressure inside the battery is greater than the opening pressure of the second pressure relief valve 22, the second groove 221 breaks and the second pressure relief valve 22 is bent at the position of the second connecting part 222.

[0045] This improves the stability of the first pressure relief valve 21 and the second pressure relief valve 22, making it easier to open the corresponding first pressure relief valve 21 or second pressure relief valve 22 when the opening pressure is reached. This allows the first pressure relief valve 21 and the second pressure relief valve 22 to flexibly relieve pressure according to different gas production rates. The arrangement of the first connecting part 212 and the second connecting part 222 can improve the connection strength between the first pressure relief valve 21 and the second pressure relief valve 22 and the housing body 1, reduce the structural impact on the housing body 1 when the first pressure relief valve 21 and the second pressure relief valve 22 are opened, and improve the safety of the battery.

[0046] See Figure 2 In some embodiments, the first connecting portion 212 and the second groove 221 of the same pressure relief assembly 2 are spaced apart.

[0047] In this way, the structural strength between the first pressure relief valve 21 and the second pressure relief valve 22 can be improved, avoiding the formation of weak points due to the close proximity of the first connecting part 212 and the second groove 221. This makes the stress on the housing body 1 more uniform. When the internal pressure of the battery increases, the first pressure relief valve 21 opens first, and the corresponding first connecting part 212 bends. Since there is a gap between it and the second groove 221, the influence of the first connecting part 212 on the second groove 221 can be reduced. When the pressure further increases and causes the second pressure relief valve 22 to open, it is not easily interfered with by the first connecting part 212, thus improving the pressure relief effect and enhancing the safety of the battery.

[0048] See Figure 2 In some embodiments, the width of the first connecting portion 212 is smaller than the width of the first groove 211 on the side opposite to the first connecting portion 212.

[0049] In this embodiment, the two ends of the first groove 211 extend in a direction that approaches each other, the area formed by the first groove 211 and the first connecting part 212 is triangular in shape, and the area formed by the second groove 221 and the second connecting part 222 is rectangular in shape.

[0050] In this way, when the gas production rate is low, the gas pressure is more likely to concentrate in the first groove 211 and break off and release pressure in time. The first connecting part 212 is narrow and easy to bend, ensuring that the first pressure relief valve can respond quickly at low gas production rates and improve pressure relief efficiency. When the gas production rate is high, the rectangular second pressure relief valve 22 can provide a pressure relief channel with a large flow rate, realize rapid pressure relief, avoid battery structure damage or performance degradation, and improve battery safety.

[0051] It is understandable that the widths of the two first connecting parts 212 can be equal or unequal. Similarly, the widths of the two second connecting parts 222 can be equal or unequal. Both can be adjusted according to actual needs, which will not be elaborated here.

[0052] See Figure 2 In some embodiments, the second grooves 221 of the two sets of pressure relief components 2 are arranged to overlap at the ends opposite to the second connecting portion 222. That is, the second grooves 221 of the two sets of pressure relief components 2 are connected.

[0053] In this embodiment, the two second pressure relief valves 22 open in opposite directions. When the pressure inside the battery exceeds the opening pressure of the second pressure relief valve 22, the two second pressure relief valves 22 open and form an exhaust channel extending along the length of the side wall of the housing body 1.

[0054] Thus, the two second grooves 221 partially overlap, which makes the second pressure relief valve 22 more compact, improves space utilization, and facilitates the timely opening of the second pressure relief valve 22 when the internal pressure of the battery suddenly increases, so that the gas can be fully discharged to the outside through the exhaust channel, improving the pressure relief efficiency. In addition, it makes the shell body 1 subjected to uniform force during the exhaust process, reducing the deformation of the side wall of the shell body 1 caused by excessive force on one side, and improving the safety of the battery.

[0055] Alternatively, in some other embodiments, the second grooves 221 of the two sets of pressure relief components 2 are spaced apart from one end of the second connecting portion 222.

[0056] This allows for higher structural strength between the two second pressure relief valves 22, improving the stability of the housing body 1.

[0057] It is understandable that the spacing between the second grooves 221 of the two sets of pressure relief components 2 can be adjusted according to actual needs, which will not be elaborated here.

[0058] See Figure 1 The present invention also provides a battery, including a cell (not shown in the figure), a cover plate (not shown in the figure) and a housing, wherein the cell is disposed inside the housing and the cover plate is connected to the housing.

[0059] In this embodiment, the first pressure relief valve 21 and the second pressure relief valve 22 are disposed at the bottom of the housing body 1, and the cover plate is fixedly connected to the top of the housing body 1 to enclose and form a space for accommodating the battery cell.

[0060] In this way, the space of the housing body 1 can be fully utilized, avoiding assembly interference between the cover plate and the first pressure relief valve 21 and the second pressure relief valve 22, improving the pressure relief effect, reducing the impact of the first pressure relief valve 21 and the second pressure relief valve 22 on the cell and the cover plate during the venting process, and improving the safety of the battery.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A housing, characterized in that, Comprising: a shell body (1); a pressure relief assembly (2), wherein the pressure relief assembly (2) comprises a first pressure relief valve (21) and a second pressure relief valve (22), both the first pressure relief valve (21) and the second pressure relief valve (22) are arranged on a side wall of the shell body (1), the first pressure relief valve (21) comprises a first score groove (211), the second pressure relief valve (22) comprises a second score groove (221), in a thickness direction of the shell body (1), a projection of the first score groove (211) of the pressure relief assembly (2) in the same group is located inside a projection of the second score groove (221), and an opening pressure of the first pressure relief valve (21) is lower than an opening pressure of the second pressure relief valve (22).

2. The housing according to claim 1, characterized in that, the first score groove (211) is C-shaped or square-shaped; and / or, the second score groove (221) is C-shaped or square-shaped.

3. The housing according to claim 1, characterized in that, a symmetry axis of the first score groove (211) coincides with a symmetry axis of the shell body in a length direction; and / or, a symmetry axis of the second score groove (221) coincides with the symmetry axis of the shell body in the length direction.

4. The housing according to claim 1, characterized in that, an opening direction of the first pressure relief valve (21) of the pressure relief assembly (2) in the same group is opposite to an opening direction of the second pressure relief valve (22).

5. The housing according to claim 1, characterized in that, two groups of the pressure relief assemblies (2) are provided, and the two groups of pressure relief assemblies (2) are symmetrically arranged on the side wall of the shell body (1).

6. The housing according to claim 5, characterized in that, the first pressure relief valve (21) further comprises a first connecting portion (212), the first connecting portion (212) is connected with an end of the first score groove (211), the second pressure relief valve (22) further comprises a second connecting portion (222), and the second connecting portion (222) is connected with an end of the second score groove (221).

7. The housing according to claim 6, characterized in that, the first connecting portion (211) of the pressure relief assembly (2) in the same group and the second score groove (221) are arranged at an interval.

8. The housing according to claim 6, characterized in that, a width of the first connecting portion (212) is smaller than a width of a side of the first score groove (211) facing away from the first connecting portion (212).

9. The housing according to claim 6, characterized in that, ends, facing away from the second connecting portion (222), of the second score grooves (221) of the two groups of pressure relief assemblies (2) are arranged in an overlapping manner, or ends, facing away from the second connecting portion (222), of the second score grooves (221) of the two groups of pressure relief assemblies (2) are arranged at an interval.

10. A battery, characterized in that, comprising a battery cell, a cover plate and the shell according to any one of claims 1-9, wherein the battery cell is arranged inside the shell, and the cover plate is connected with the shell.

Images