battery

Abstract

The utility model relates to battery technical field, concretely relates to a battery. The battery includes: the shell subassembly is internally provided with the accommodation cavity, installs the core subassembly in the accommodation cavity, the bottom of shell subassembly is provided with the mounting hole, the bottom thickness of shell subassembly is greater than the top thickness, the explosion -proof sheet is set up in the bottom of shell subassembly and covers the mounting hole completely, the weak area is set up on the explosion -proof sheet, and the weak area is used to reach certain air pressure after the battery inside breaks through the weak area and realizes pressure -relief, and the reinforcement rib subassembly is set up at least in the bottom of shell subassembly. The battery of the application can avoid the uneven stress of the explosion -proof sheet due to the bottom too thin and the insufficient strength, thereby appearing the condition of early blasting, and the setting of the reinforcement rib subassembly can support the shell, avoid the extrusion explosion -proof sheet condition that the shell deforms, and further can guarantee the explosion -proof sheet within the normal air pressure threshold breaks.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery. Background Technology

[0002] Currently, in order to improve the safety of new energy vehicles, the explosion-proof valve of the power battery is usually facing the bottom of the vehicle body. In the event of thermal runaway of the power battery, the gaseous and liquid substances generated by the explosion can be released directly to the bottom of the vehicle body, avoiding damage to the vehicle body.

[0003] However, when the explosion-proof valve of the existing battery is placed at the bottom of the power battery, the bottom of the power battery is prone to deformation during thermal runaway, causing the explosion-proof valve to explode prematurely, affecting the use of the power battery. Utility Model Content

[0004] In view of this, the present invention provides a battery to solve the problem that the explosion-proof valve is prone to premature explosion when it is set facing the bottom of the vehicle body.

[0005] In a first aspect, this utility model provides a battery, which includes: The housing assembly has an internal receiving cavity; the receiving cavity houses the battery cell assembly; the bottom of the housing assembly has a mounting hole; the bottom thickness of the housing assembly is greater than the top thickness. An explosion-proof sheet is installed at the bottom of the housing assembly and completely covers the mounting holes; the explosion-proof sheet has a weak area, which is used to release pressure when the internal pressure of the battery reaches a certain level. A reinforcing rib assembly is provided at least at the bottom of the housing assembly.

[0006] Beneficial effects: The above technical solution makes the bottom thickness of the outer shell assembly greater than the top thickness, and at the same time, a reinforcing rib assembly is set at the bottom of the shell to avoid uneven stress on the explosion-proof sheet due to insufficient strength at the bottom, which could lead to premature explosion. In addition, the reinforcing rib assembly can support the shell and prevent the shell from deforming and squeezing the explosion-proof sheet, thus ensuring that the explosion-proof sheet explodes within the normal air pressure threshold. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the overall structure of the battery in an embodiment of this utility model; Figure 2 This is a cross-sectional view of the battery in an embodiment of this utility model; Figure 3 This is an internal structural diagram of the outer shell assembly in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of the second reinforcing rib in an embodiment of this utility model.

[0009] Explanation of reference numerals in the attached figures: 1. Housing assembly; 11. Housing; 12. Cover plate; 13. Welding wire; 2. Battery cell assembly; 3. Explosion-proof sheet; 4. Reinforcing rib assembly; 41. First reinforcing rib; 42. Second reinforcing rib; 43. Through hole; 44. Through groove; 45. Reinforcing grid; 5. Pole post assembly. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0011] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0012] 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; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0013] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0014] Currently, in order to improve the safety of new energy vehicles, the explosion-proof valve of the power battery is usually facing the bottom of the vehicle body. In the event of thermal runaway of the power battery, the gaseous and liquid substances generated by the explosion can be released directly to the bottom of the vehicle body, avoiding damage to the vehicle body.

[0015] However, when the explosion-proof valve of the existing battery is placed at the bottom of the power battery, the bottom of the power battery is prone to deformation during thermal runaway, causing the explosion-proof valve to explode prematurely, affecting the use of the power battery.

[0016] In view of this, the present invention provides a battery to solve the problem that the explosion-proof valve is prone to premature explosion when it is set facing the bottom of the vehicle body.

[0017] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.

[0018] According to an embodiment of the present invention, a battery is provided, which includes a housing assembly 1, an explosion-proof sheet 3, and a reinforcing rib assembly 4.

[0019] Specifically, in this embodiment, the housing assembly 1 has an internal receiving cavity, in which the battery cell assembly 2 is installed. The housing assembly 1 may be made of metal, and the battery cell assembly 2 includes electrodes and a separator. The electrodes are typically positive and negative electrodes, and the separator is disposed between the positive and negative electrodes to separate them and prevent short circuits. The separator may be at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. A coating may also be provided on the surface of the separator. The coating may be an inorganic coating and, or an organic coating, wherein the inorganic coating material includes at least one of alumina, silicon oxide, titanium oxide, magnesium oxide, zirconium oxide, and boehmite. The organic coating includes at least one of aramid coating and polyvinylidene fluoride coating.

[0020] Furthermore, in this embodiment, a mounting hole is provided at the bottom of the outer casing assembly 1. The shape of the mounting hole can be circular, circular-rectangular, rectangular, or even an elliptical structure resembling a racetrack. Of course, this embodiment is merely an example of the shape of the mounting hole, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0021] Furthermore, in this embodiment, the bottom thickness of the housing assembly 1 is greater than the top thickness. Since the explosion-proof valve in this embodiment is located at the bottom of the housing assembly 1, the bottom thickness of the housing assembly 1 can be appropriately increased, making the bottom thickness greater than the top thickness.

[0022] Furthermore, in this embodiment, the explosion-proof plate 3 is disposed at the bottom of the housing assembly 1 and completely covers the mounting hole. The explosion-proof plate 3 can be connected to the wall of the mounting hole by welding, although other connection methods can also be used; this embodiment is merely an example. After the explosion-proof plate 3 is welded to the mounting hole, an explosion-proof valve can be formed.

[0023] Furthermore, in this embodiment, the explosion-proof sheet 3 is provided with a weak area. This weak area is used to release pressure when the internal pressure of the battery reaches a certain level. Of course, the weak area can be a notch or a thinned area. This embodiment is merely an example illustrating the specific type of the weak area 31, but it is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0024] As for the weak area, its thickness is smaller than that of the explosion-proof sheet 3 itself. Therefore, when the battery experiences thermal runaway and the internal pressure of the battery reaches a certain level, it can break through the weak area 31 in time to complete the pressure relief.

[0025] Furthermore, in this embodiment, the reinforcing rib assembly 4 is provided at least at the bottom of the outer shell assembly 1 to increase the strength of the area surrounding the explosion-proof sheet 3.

[0026] With this configuration, the thickness of the bottom of the outer shell assembly 1 is greater than that of the top. Furthermore, a reinforcing rib assembly 4 is provided on the outer shell assembly 1 to prevent uneven stress on the explosion-proof disc 3 due to insufficient strength caused by an excessively thin bottom, thus avoiding premature explosion. The reinforcing rib assembly 4 also supports the outer shell assembly 1, preventing deformation that could compress the explosion-proof disc 3, thereby ensuring that the explosion-proof disc 3 explodes within the normal atmospheric pressure threshold.

[0027] Furthermore, in an alternative embodiment, the bottom thickness of the housing assembly 1 is between 1.5 mm and 3 mm, and the difference between the bottom thickness and the top thickness is between 0.5 mm and 1.5 mm.

[0028] For example, the bottom thickness of the outer casing assembly 1 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, etc. Of course, this embodiment is merely an example of the bottom thickness of the outer casing assembly 1, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0029] Similarly, the difference between the bottom thickness and the top thickness can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc. Of course, this embodiment is merely an example illustrating the difference between the bottom thickness and the top thickness, and is not intended to limit the application. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0030] By appropriately increasing the thickness of the bottom in this embodiment, the structural support strength of the bottom of the outer casing assembly 1 can be improved, avoiding uneven stress on the explosion-proof sheet 3 due to an excessively thin bottom, which could lead to premature explosion. However, if the bottom is too thick, it will compress the internal space, potentially reducing the battery's energy density and space utilization. If the bottom is too thin, there is no structural strength to support the outer casing assembly 1, making the explosion-proof sheet 3 prone to premature explosion.

[0031] Furthermore, this embodiment limits the difference between the bottom thickness and the top thickness to a certain range. This avoids insufficient structural strength caused by the top or bottom being too thin, thereby preventing the top of the casing from deforming under pressure and affecting the normal operation of the battery. At the same time, it also avoids the difference being too small, thus ensuring that the bottom has a stronger supporting advantage than the top.

[0032] Furthermore, as a first embodiment, the housing assembly 1 includes a housing 11 and a cover plate 12. In this embodiment, the explosion-proof valve may be disposed at the bottom of the housing 11.

[0033] Specifically, the housing 11 has an internal cavity, the cover plate 12 is located at the top of the housing 11, and the explosion-proof plate 3 is located at the bottom of the housing 11, with the bottom thickness of the housing 11 being greater than the thickness of the cover plate 12. In other words, the mounting hole is directly opened at the bottom of the housing 11, and the explosion-proof plate 3 is welded to the mounting hole, thereby placing the explosion-proof valve at the bottom of the housing 11.

[0034] Furthermore, the difference between the bottom thickness of the housing 11 and the thickness of the cover plate 12 is between 0.5mm and 0.8mm. For example, the difference between the bottom thickness and the top thickness can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, etc. Of course, this embodiment is merely an example of the difference between the bottom thickness and the top thickness, but it is not intended to limit the scope. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0035] When the thickness of the bottom of the housing 11 is increased too much, work hardening is likely to occur during the stretching and forming process of the housing 11. Therefore, controlling the difference between the bottom thickness of the housing 11 and the thickness of the cover plate 12 within a certain range can prevent the housing 11 from cracking, thereby improving the yield rate.

[0036] Furthermore, as a second embodiment, the housing assembly 1 includes a housing 11 and a cover plate 12. In this embodiment, an explosion-proof valve may be disposed on the cover plate 12.

[0037] Specifically, the housing 11 has an internal cavity, a cover plate 12 is located at the bottom of the housing 11, and an explosion-proof sheet 3 is mounted on the cover plate 12. The thickness of the cover plate 12 is greater than the thickness of the top of the housing 11. In other words, the cover plate 12 is the bottom plate of the housing 11, and mounting holes are provided on the cover plate 12. The explosion-proof sheet 3 is welded to the mounting holes, thereby placing the explosion-proof valve at the bottom of the housing 11.

[0038] Furthermore, in this embodiment, the difference between the thickness of the cover plate 12 and the top thickness of the housing 11 is between 0.7mm and 1.5mm. For example, it can be 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc. Of course, this embodiment is merely an example illustrating the difference between the bottom thickness and the top thickness, but it is not a limitation. Those skilled in the art can make changes according to actual circumstances, as long as the same technical effect is achieved.

[0039] Furthermore, in an optional embodiment, the cover plate 12 is welded to the housing 11 to form a weld line 13, and the distance between the explosion-proof sheet 3 and the weld line 13 in the horizontal direction is L1 mm, and L1 mm is between 60 mm and 150 mm.

[0040] For example, L1 mm can be 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, etc. Of course, this embodiment is merely an example of a specific value for L1 mm, but it is not intended to limit the value. Those skilled in the art can modify it according to the actual situation, as long as the same technical effect is achieved.

[0041] By setting the distance between the explosion-proof plate 3 and the welding wire 13 within a certain range, this embodiment can prevent the heat and stress of the welding wire 13 from being transferred to the explosion-proof plate 3, avoid premature softening or deformation of the weak area, and ensure that the explosion-proof plate 3 releases pressure according to the set pressure. If L1 is too small, the high temperature during welding of the welding wire 13, such as the heat from laser welding or the heat transfer during melting, will easily cause the weak area of ​​the explosion-proof plate 3 to soften prematurely or even crack. At the same time, the welding stress of the welding wire 13 will be transmitted to the explosion-proof plate 3, causing the weak area to deform under stress. If L1 is too large, it will waste the internal space of the housing 11, thereby affecting the installation of the battery cell assembly 2 and may lead to redundancy in the housing structure. It may even reduce the burst area of ​​the explosion-proof plate 3, affecting the normal pressure release of the explosion-proof plate 3.

[0042] Furthermore, in an alternative embodiment, the welding strength between the cover plate 12 and the housing 11 is greater than the burst pressure of the weak area.

[0043] With this configuration, the weld strength between the cover plate 12 and the housing 11 is greater than the burst pressure of the weak point in this embodiment. This ensures that the explosion-proof plate 3 fails before the weld line 13, avoiding the risk of leakage caused by premature failure of the housing assembly 1. At the same time, the pressure generated during thermal runaway can also be released normally through the weak point of the explosion-proof plate 3, rather than leaking from the weld position between the cover plate 12 and the housing 11, thus keeping the weld line 13 sealed and avoiding secondary risks caused by seal failure.

[0044] Furthermore, in an alternative embodiment, the battery further includes a terminal assembly 5 disposed on top of the housing assembly 1.

[0045] When the explosion-proof valve is directly installed at the bottom of the housing 11, the cover plate 12 is located at the top of the housing 11, and the pole assembly 5 is provided on the cover plate 12. When the cover plate 12 is located at the bottom of the housing 11, and the explosion-proof valve is installed on the cover plate 12, the pole assembly 5 is provided at the top of the housing 11.

[0046] With this configuration, the terminal assembly 5 is positioned at the top of the housing assembly 1, allowing it to be completely separated from the bottom explosion-proof sheet 3. Since the terminal assembly is a current transmission component, it generates heat during operation. If it were positioned on the same side as the explosion-proof sheet 3, heat would easily be transferred to the weakest area of ​​the explosion-proof sheet 3, causing it to soften prematurely. Therefore, this configuration avoids heat interference. Simultaneously, it also prevents gas from impacting the terminal assembly when the explosion-proof sheet 3 releases pressure downwards, thereby ensuring the battery's safety in the event of thermal runaway.

[0047] Furthermore, in an optional embodiment, the reinforcing rib assembly 4 includes a first reinforcing rib 41, which is disposed on the inner sidewall of the housing assembly 1.

[0048] With this configuration, the first reinforcing rib 41 on the inner sidewall of the outer casing assembly 1 in this embodiment can improve the structural strength of the sidewall of the outer casing assembly 1, thereby limiting the bulging of the sidewall under the pressure of thermal runaway, preventing the bottom explosion-proof sheet 3 from being subjected to uneven stress due to sidewall deformation, and preventing accidental explosion. At the same time, the first reinforcing rib 41 can also enhance the overall rigidity of the sidewall and improve the overall structural strength.

[0049] Furthermore, in an optional embodiment, the reinforcing rib assembly 4 further includes a second reinforcing rib 42, which is disposed on the inner bottom wall of the outer shell assembly 1 and located circumferentially around the edge of the explosion-proof sheet 3. Alternatively, the second reinforcing ribs 42 may be uniformly disposed on the inner bottom wall of the outer shell assembly 1.

[0050] With this configuration, the second reinforcing rib 42 in this embodiment strengthens the structural strength of the edge of the explosion-proof sheet 3, thereby preventing premature breakage of the weak area due to edge warping. Furthermore, it enhances the structural strength of the bottom wall, enabling it to withstand stronger external pressure to a certain extent, preventing bottom wall depressions from affecting the shape of the explosion-proof sheet 3, and ensuring that the explosion-proof sheet 3 releases pressure as designed. Moreover, the reinforcing rib can disperse the pressure at the edge of the explosion-proof sheet 3; for example, when internal air pressure is applied, the pressure is transmitted to the bottom wall through the reinforcing rib, preventing excessive local stress on the edge.

[0051] Furthermore, in an optional embodiment, the distance between the second reinforcing rib 42 and the explosion-proof sheet 3 is L2mm, where L2mm satisfies 10mm≤L2mm≤30mm.

[0052] For example, L2 mm can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, etc. Of course, this embodiment is merely an example of a specific value for L2 mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0053] By setting the distance between the second reinforcing rib 42 and the explosion-proof sheet 3 within a certain range, this embodiment ensures that the second reinforcing rib 42 can reach the edge of the explosion-proof sheet 3, preventing edge deformation and thus avoiding premature rupture of the weak area. Simultaneously, it prevents the reinforcing rib from obstructing the pressure relief area of ​​the explosion-proof sheet 3, ensuring that gaseous and liquid substances can be smoothly discharged during thermal runaway. If L2 is too small, the reinforcing rib may easily obstruct the weak area of ​​the explosion-proof sheet 3, potentially preventing gas from escaping smoothly during pressure relief, or causing the stress dispersed by the reinforcing rib to be transferred to the periphery of the explosion-proof sheet 3, leading to deformation of the peripheral structure. If L2 is too large, the reinforcing rib cannot effectively support the edge of the explosion-proof sheet 3, thus failing to provide effective circumferential support and easily causing deformation of the peripheral structure.

[0054] Furthermore, in an optional embodiment, the second reinforcing rib 42 extends vertically toward the battery cell assembly 2 and abuts against the battery cell assembly 2. Of course, to ensure insulation between the housing 11 and the battery cell assembly 2, an insulating element is required between the second reinforcing rib 42 and the battery cell assembly 2 to achieve insulation between the housing 11 and the battery cell assembly 2.

[0055] With this configuration, the second reinforcing rib 42 in this embodiment abuts against the battery cell, which to some extent fixes the position of the battery cell assembly 2, thereby preventing the battery from shaking and colliding with the explosion-proof sheet 3 during use. At the same time, the second reinforcing rib 42 can also reserve a pressure relief space between the battery cell assembly 2 and the housing 11, ensuring that the gaseous and liquid substances generated by thermal runaway can be discharged smoothly, and preventing the battery cell assembly 2 from clogging the explosion-proof valve.

[0056] Furthermore, in an optional embodiment, the second reinforcing rib 42 is provided with a plurality of through holes 43, one end of the through hole 43 being located on the side of the second reinforcing rib 42 close to the explosion-proof sheet 3, and the other end of the through hole 43 being located on the side of the second reinforcing rib 42 away from the explosion-proof sheet 3.

[0057] With this configuration, by having the through-hole 43 extending through both sides of the second reinforcing rib 42, the gas generated by thermal runaway can be smoothly discharged from the cell side to the explosion-proof sheet 3 side, preventing gas accumulation. Furthermore, multiple through-holes 43 ensure that gas can be discharged through multiple paths during pressure relief, avoiding the inability to relieve pressure due to blockage of a single path. Simultaneously, the through-holes 43 can reduce the material usage of the second reinforcing rib 42, thereby reducing the overall weight and cost of the battery to some extent.

[0058] Furthermore, in an optional embodiment, the depth of the via 43 is L3mm, the diameter of the via 43 is L4mm, and 3mm≤L3mm≤10mm, 2mm≤L4mm≤5mm.

[0059] For example, L3 mm can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. Of course, this embodiment is merely an example of a specific value for L3 mm, but it is not intended to limit the value. Those skilled in the art can make changes according to actual circumstances, as long as the same technical effect is achieved.

[0060] Similarly, L4 mm can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, etc. Of course, this embodiment is merely an example of a specific value for L4 mm, and does not limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0061] By setting the via 43 within a certain range, this embodiment ensures smooth gas flow and prevents pressure buildup during depressurization. While ensuring smooth gas flow, it also guarantees the structural strength of the second reinforcing rib 42, ensuring it can support the battery cell assembly 2 and the explosion-proof sheet 3, preventing the via 43 from weakening its rigidity. If L3 is too shallow, it cannot penetrate the second reinforcing rib 42, thus failing to guide gas flow. If L3 is too deep, it may weaken the rigidity of the second reinforcing rib 42, thus failing to support the battery cell assembly 2. Furthermore, if the aperture L4 is too small, it results in high gas flow resistance, making it prone to blockage by gaseous or liquid substances during depressurization, thus affecting depressurization. If the aperture L4 is too large, it will cause insufficient local strength of the second reinforcing rib 42, making it prone to breakage during actual use.

[0062] Furthermore, in an optional embodiment, the plurality of vias 43 are spaced apart, with the spacing between two adjacent vias 43 being L5mm, and 10mm≤L5mm≤20mm.

[0063] For example, L5 mm can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc. Of course, this embodiment is only an example of a specific value of L5 mm, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect can be achieved.

[0064] With this configuration, the spacing between two adjacent through holes 43 is limited to a certain range in this embodiment. This ensures smooth airflow while also providing the second reinforcing rib 42 with a certain supporting capacity. Furthermore, evenly distributing the through holes 43 on the second reinforcing rib 42 can prevent gas accumulation caused by the absence of through holes 43 in certain areas inside the housing 11, ensuring that the battery depressurizes at the set depressurization rate.

[0065] Furthermore, in an optional embodiment, the second reinforcing rib 42 has multiple through slots 44 at its end near the cell assembly 2, with the multiple through slots 44 spaced apart. Figure 3 As shown, four through slots 44 can be provided. Figure 4 As shown, the second reinforcing rib 42 is provided with two through slots 44. Of course, this embodiment is only an example of the number of through slots 44, but it is not a limitation. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0066] With this configuration, multiple through slots 44 are provided on the second reinforcing rib 42 in this embodiment, which can provide additional exhaust channels for gas and small ejected objects, allowing gas to be discharged simultaneously from the through hole 43 and through slots 44, avoiding exhaust obstruction and pressure accumulation caused by partial pressure relief channel closure, and balancing the support function and exhaust demand.

[0067] Furthermore, in an optional embodiment, the groove depth of the through groove 44 is L6mm, the groove width of the through groove 44 is L7mm, and 1mm≤L6mm≤3mm, 3mm≤L7mm≤10mm.

[0068] For example, L6 mm can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3.0mm. Of course, this embodiment is merely an example of a specific value for L6 mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0069] Similarly, L7 mm can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. Of course, this embodiment is merely an example of a specific value for L7 mm, but it is not intended to limit the value. Those skilled in the art can make changes according to actual circumstances, as long as the same technical effect is achieved.

[0070] By setting it in this way, the dimensions of the through slot 44 are limited to a certain range in this embodiment, which can ensure the effective flow area of ​​the through slot 44, while avoiding the weakening of the supporting strength of the second reinforcing rib 42 due to excessive size. If the slot width or depth is too small, the flow area of ​​the through slot 44 will be insufficient, and it will not be able to effectively assist in venting. If the size is too large, it will cause the strength of the second reinforcing rib 42 to decrease, and it will not be able to stably support the battery cell assembly 2.

[0071] Furthermore, in an optional embodiment, the spacing between two adjacent through slots 44 is L8mm, and 8mm≤L8mm≤15mm.

[0072] For example, L8 mm can be 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc. Of course, this embodiment is merely an example of a specific value for L8 mm, but it is not intended to limit the value. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0073] By setting the spacing between two adjacent through slots 44 within a certain range, this embodiment ensures that the through slots 44 are evenly distributed around the base, guaranteeing balanced airflow in all areas and preventing localized airflow obstruction. It also ensures the continuity of the remaining base structure. If the spacing is too small, the through slots 44 will be too dense, leading to fragmentation of the second reinforcing rib 42 and a decrease in support strength. If the spacing is too large, the through slots 44 will be sparsely distributed, obstructing airflow in the area between two slots, easily creating airflow dead zones and causing pressure concentration.

[0074] Furthermore, in an optional embodiment, the bottom of the through groove 44 is provided with a guide slope.

[0075] With this configuration, this embodiment, by providing a guide slope at the bottom of the through-slot 44, can guide the airflow to flow smoothly along the slope, reducing turbulence and pressure loss, improving exhaust efficiency, and reducing the internal pressure of the battery more quickly. If the bottom of the slot is a right angle, that is, without a slope, the airflow will form turbulence due to the sudden change in direction, resulting in pressure concentration.

[0076] Furthermore, in an optional embodiment, the reinforcing rib assembly 4 further includes a reinforcing grille 45 disposed at the mounting hole and located on the side of the mounting hole closer to the inside of the battery. The reinforcing grille 45 is configured to at least partially correspond to the weak area. That is, the reinforcing grille 45 may be configured to correspond only to the weak area, or the reinforcing grille 45 may completely cover the entire explosion-proof sheet 3.

[0077] With this configuration, this embodiment can form a physical barrier through the intersecting structure of the reinforced grille 45. When large, incompletely burned particles are ejected from the battery cell, the reinforced grille 45 can block these particles, thus preventing them from being ejected and avoiding the possibility of large particles burning adjacent batteries and causing a chain reaction of thermal runaway. At the same time, the intersecting mesh of the transverse and longitudinal ribs can normally provide pressure relief channels for gases and small ejected materials, thereby preventing the problem of a sudden increase in internal battery pressure due to complete sealing, which could lead to an explosion of the casing 11.

[0078] Furthermore, in an optional embodiment, the reinforcing rib assembly 4 is integrally formed with the outer shell assembly 1. That is, the reinforcing rib assembly 4 and the outer shell assembly 1 are directly cast from the same material. Since the material of the outer shell assembly 1 itself has a high melting point, the reinforcing rib assembly 4 will not soften or melt at high temperatures during thermal runaway, allowing the reinforcing rib assembly 4 to still support the cell assembly 2.

[0079] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: The outer casing assembly (1) has an internal cavity; a battery cell assembly (2) is installed in the cavity; a mounting hole is provided at the bottom of the outer casing assembly (1); the bottom thickness of the outer casing assembly (1) is greater than the top thickness; An explosion-proof sheet (3) is provided at the bottom of the outer casing assembly (1) and completely covers the mounting hole; a weak area is provided on the explosion-proof sheet (3), and the weak area is used to release pressure when the internal pressure of the battery reaches a certain level; A reinforcing rib assembly (4) is provided at least at the bottom of the outer shell assembly (1).

2. The battery according to claim 1, characterized in that, The bottom thickness of the outer shell assembly (1) is between 1.5mm and 3mm, and the difference between the bottom thickness and the top thickness is between 0.5mm and 1.5mm.

3. The battery according to claim 2, characterized in that, The housing assembly (1) includes: The housing (11) has the receiving cavity inside; A cover plate (12) is disposed on the top of the housing (11); The explosion-proof sheet (3) is disposed at the bottom of the housing (11), and the bottom thickness of the housing (11) is greater than the thickness of the cover plate (12). The difference between the bottom thickness of the housing (11) and the thickness of the cover plate (12) is 0.5mm-0.8mm.

4. The battery according to claim 3, characterized in that, The housing assembly (1) includes: The housing (11) has the receiving cavity inside; A cover plate (12) is disposed at the bottom of the housing (11); The explosion-proof sheet (3) is disposed on the cover plate (12), and the thickness of the cover plate (12) is greater than the top thickness of the housing (11). The difference between the thickness of the cover plate (12) and the top thickness of the housing (11) is 0.7 mm-1.5 mm.

5. The battery according to claim 3 or 4, characterized in that, The cover plate (12) is welded to the shell (11) to form a weld line (13). In the horizontal direction, the distance between the explosion-proof sheet (3) and the weld line (13) is L1 mm, and 60 mm ≤ L1 mm ≤ 150 mm.

6. The battery according to claim 5, characterized in that, The welding strength between the cover plate (12) and the shell (11) is greater than the burst pressure of the weak area.

7. The battery according to any one of claims 1 to 4, characterized in that, The battery also includes: The pole assembly (5) is disposed on top of the housing assembly (1).

8. The battery according to any one of claims 1 to 4, characterized in that, The reinforcing rib assembly (4) includes: The first reinforcing rib (41) is disposed on the inner sidewall of the outer shell assembly (1).

9. The battery according to claim 8, characterized in that, The reinforcing rib assembly (4) also includes: The second reinforcing rib (42) is disposed on the inner bottom wall of the outer shell assembly (1) and located around the edge of the explosion-proof sheet (3).

10. The battery according to claim 9, characterized in that, The distance between the second reinforcing rib (42) and the explosion-proof sheet (3) is L2 mm, and 10 mm ≤ L2 mm ≤ 30 mm.

11. The battery according to claim 10, characterized in that, In the vertical direction, the second reinforcing rib (42) extends toward the battery cell assembly (2) and abuts against the battery cell assembly (2).

12. The battery according to claim 11, characterized in that, The second reinforcing rib (42) has a plurality of through holes (43). One end of the through hole (43) is located on the side of the second reinforcing rib (42) close to the explosion-proof sheet (3), and the other end of the through hole (43) is located on the side of the second reinforcing rib (42) away from the explosion-proof sheet (3).

13. The battery according to claim 12, characterized in that, The depth of the via (43) is L3 mm, the diameter of the via (43) is L4 mm, and 3 mm ≤ L3 mm ≤ 10 mm, 2 mm ≤ L4 mm ≤ 5 mm.

14. The battery according to claim 13, characterized in that, Multiple vias (43) are spaced apart, with a spacing of L5 mm between two adjacent vias (43), and 10 mm ≤ L5 mm ≤ 20 mm.

15. The battery according to any one of claims 9 to 14, characterized in that, The second reinforcing rib (42) has multiple through slots (44) at the end near the end of the battery cell assembly (2), and the multiple through slots (44) are spaced apart.

16. The battery according to claim 15, characterized in that, The groove (44) has a groove depth of L6 mm and a groove width of L7 mm, and 1 mm ≤ L6 mm ≤ 3 mm, 3 mm ≤ L7 mm ≤ 10 mm.

17. The battery according to claim 16, characterized in that, The distance between two adjacent through slots (44) is L8 mm, and 8 mm ≤ L8 mm ≤ 15 mm.

18. The battery according to claim 17, characterized in that, The bottom of the through groove (44) is provided with a guide slope.

19. The battery according to any one of claims 9 to 14, characterized in that, The reinforcing rib assembly (4) also includes: A reinforcing grille (45) is provided at the mounting hole and located on the side of the mounting hole closer to the inside of the battery. The reinforcing grille (45) is provided at least partially corresponding to the weak area.

20. The battery according to any one of claims 9 to 14, characterized in that, The reinforcing rib assembly (4) is integrally formed with the outer shell assembly (1).

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