A lithium battery sheet metal box

Abstract

This utility model discloses a lithium battery sheet metal box, including a top cover with a venting structure. The venting structure connects the interior and exterior of the lithium battery sheet metal box to allow gas generated inside the battery to escape. The venting structure includes a venting component and a waterproof and breathable membrane. The venting component includes a large-hole section and a small-hole section, which are connected by a stepped surface. The large-hole section is detachably connected to a fixing component. The waterproof and breathable membrane is clamped and fixed between the stepped surface and the fixing component, thus preventing the membrane from easily falling off. The fixing component has a through hole connecting the waterproof and breathable membrane to the interior of the sheet metal box. Furthermore, during the airtightness test of the lithium battery, the yield rate of the lithium battery sheet metal box can be ensured by replacing the waterproof and breathable membrane between the venting component and the fixing component. Alternatively, the membrane can be replaced when the membrane porosity increases and / or the waterproof and breathable membrane is damaged, causing a decrease in waterproof performance, to ensure the safety of the lithium battery sheet metal box during use.

Description

Technical Field

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

[0002] Currently, lithium battery products, in order to be suitable for various environments, must meet the IP67 protection safety level while also being able to expel gases generated inside the battery. Therefore, a vent pipe is usually installed on the outside of the top cover of the lithium battery box. A waterproof and breathable membrane is attached to the vent hole inside the box, facing the vent pipe from the inside of the top cover. When the battery fluid inside the box reacts and produces gas, it can be expelled through the vent pipe, and the waterproof and breathable membrane prevents water from entering the battery. However, most existing waterproof and breathable membranes are adhered with 3M adhesive. If the internal air pressure of the lithium battery box is too high or after prolonged use, there is a risk that the waterproof and breathable membrane will detach, thus failing to provide waterproofing. Utility Model Content

[0003] The purpose of this utility model is to provide a lithium battery sheet metal box with a waterproof and breathable membrane that is not easy to fall off and is replaceable.

[0004] To achieve the above objectives, this utility model proposes a lithium battery sheet metal box, which includes a top cover. The top cover has a venting structure that connects the interior and exterior of the lithium battery sheet metal box to allow gas generated inside the battery to be discharged.

[0005] The exhaust structure includes an exhaust component and a waterproof and breathable membrane. The exhaust component includes a large hole section and a small hole section, which are connected by a step. The large hole section is detachably connected to a fixing component. The waterproof and breathable membrane is clamped and fixed between the step surface and the fixing component. The fixing component has a through hole that connects the waterproof and breathable membrane to the inside of the sheet metal box.

[0006] Preferably, the large hole section of the exhaust component is screwed to the fixing member, and the fixing member is a stud whose shape is adapted to the inner diameter of the large hole section, and the inner wall of the large hole section is provided with threads.

[0007] Preferably, the through hole on the fastener is a polygonal hole, which serves as an operating hole to allow the fastener to be screwed in / out.

[0008] Preferably, the exhaust structure further includes an exhaust pipe, the upper cover is also provided with a mounting hole, the small hole segment is detachably connected and fixed to the mounting hole, the exhaust pipe is detachably connected to the small hole segment and extends out of the sheet metal box upper cover.

[0009] Preferably, the exhaust pipe and the exhaust component are screwed together.

[0010] The beneficial effects of this utility model are as follows:

[0011] The lithium battery sheet metal box proposed in this utility model has an exhaust structure on the top cover, which connects the inside and outside of the lithium battery sheet metal box to allow gas generated inside the battery to escape. In order to achieve the IP67 safety protection level, the exhaust structure includes an exhaust component and a waterproof and breathable membrane to maintain the internal gas pressure balance of the battery and provide an escape channel for gas when necessary.

[0012] To secure the waterproof and breathable membrane, this invention employs a stepped venting device. The waterproof and breathable membrane is housed within the venting device, with the larger opening facing inwards and detachably connected to a fixing component. This clamps and secures the membrane between the fixing component and the stepped surface, preventing it from easily detaching. Furthermore, during lithium battery airtightness testing, the yield rate of the lithium battery sheet metal box can be maintained by replacing the waterproof and breathable membrane between the venting device and the fixing component. The membrane can also be replaced when its pore size increases or its waterproof performance deteriorates due to damage, ensuring the safety of the lithium battery sheet metal box during use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram (angle 1) of the lithium battery sheet metal box cover in a preferred embodiment of the present invention.

[0014] Figure 2 This is a schematic diagram of the exhaust structure in a preferred embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the mounting holes in a preferred embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram (angle two) of the lithium battery sheet metal box cover in a preferred embodiment of the present invention. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0019] See Figure 1-4As shown in the figure, as a preferred embodiment of the present invention, a lithium battery sheet metal box is proposed. The lithium battery sheet metal box includes a top cover and a box body (not shown in the figure). A battery is placed in the box body, and the top cover and the box body are assembled into a lithium battery. In order to prevent the internal pressure of the lithium battery from causing the gas inside to be unable to escape and thus causing the battery to explode, an exhaust structure 1 is provided on the top cover. The exhaust structure 1 connects the inside and outside of the lithium battery sheet metal box to realize the gas generated inside the battery. At the same time, when the internal pressure of the battery is too high, the exhaust structure 1 can also provide an escape channel for the gas to reduce the power of the lithium battery explosion.

[0020] The exhaust structure 1 includes an exhaust component 11, an exhaust pipe 12, and a waterproof and breathable membrane 13. The exhaust component 11 is located on the top cover to connect the inside and outside of the lithium battery sheet metal box. A waterproof and breathable membrane 13 is provided on the side of the exhaust component 11 near the inside of the lithium battery sheet metal box to prevent external impurities and moisture from entering the lithium battery while maintaining the air pressure balance inside and outside the lithium battery.

[0021] The exhaust component 11 includes a large-hole section 111 and a small-hole section 112. The large-hole section 111 and the small-hole section 112 are connected by a stepped surface 113 to form a stepped hole. A waterproof and breathable membrane 13 is disposed in the exhaust component 11. To detachably fix the waterproof and breathable membrane 13 in the exhaust component 11, a fixing member 14 is also provided in the large-hole section 111. The fixing member 14 is detachably connected to the large-hole section 111, so that the waterproof and breathable membrane 13 is clamped and fixed between the stepped surface 113 and the fixing member 14, thereby confining the waterproof and breathable membrane 13 in the large-hole section 111 of the exhaust component 11 to prevent slippage and detachment, and also making it easier to achieve a seal of the exhaust component 11. A mounting hole 2 is also provided in the top cover. The small-hole section 112 is detachably fixedly connected to the mounting hole 2, which is an interference fit in this embodiment. The exhaust pipe 12 is detachably connected to the small-hole section 112 and extends out of the outside of the lithium battery sheet metal box top cover.

[0022] To allow for venting of the lithium battery while the waterproof and breathable membrane 13 is clamped, a through hole 15 for venting is provided on the fixing member 14, connecting the waterproof and breathable membrane 13 to the interior of the sheet metal box. During production, the yield rate of the lithium battery sheet metal box is ensured by replacing the waterproof and breathable membrane 13 between the venting member 11 and the fixing member 14 during the airtightness test of the lithium battery. Alternatively, if the waterproof performance of the waterproof and breathable membrane 13 decreases due to increased pore size and / or damage, the waterproof and breathable membrane 13 can be replaced to ensure the safety of the lithium battery sheet metal box during use.

[0023] In this embodiment, the detachable connections between the fixing member 14 and the large-hole section 111, and between the exhaust pipe 12 and the small-hole section 112, are all screwed connections. The fixing member 14 is a stud with a through hole 15 in the middle and a shape adapted to the large-hole section 111. The inner wall of the large-hole section 111 is threaded. The fixing member 14 is screwed into the large-hole section 111, clamping and fixing the waterproof and breathable membrane 13 between the step surface 113 and the fixing member 14, so that the waterproof and breathable membrane 13 is tightly fixed to the step surface 113 and does not fall off. The screwed connection method of screwing the fixing member 14 into the large-hole section 111 better positions the waterproof and breathable membrane 13, making it less prone to displacement. In order to facilitate the disassembly of the fixing member 14 and the exhaust pipe 11, the through hole 15 in the fixing member 14 is a polygonal operating hole for screwing the fixing member 14 in and out. The inner wall of the small-hole section 112 is also threaded and screwed to the exhaust pipe. In other embodiments, snap-fit ​​or other methods can be used to achieve detachable connection between the fastener 14 and the large hole section 111, and between the exhaust pipe 12 and the small hole section 112.

[0024] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A lithium battery sheet metal case, characterized by, The lithium battery sheet metal box includes a top cover, which is equipped with a venting structure. The venting structure connects the interior and exterior of the lithium battery sheet metal box to allow gas generated inside the battery to escape. The exhaust structure includes an exhaust component and a waterproof and breathable membrane. The exhaust component includes a large hole section and a small hole section, which are connected by a stepped surface. The large hole section is detachably connected to a fixing component. The waterproof and breathable membrane is clamped and fixed between the stepped surface and the fixing component. The fixing component has a through hole that connects the waterproof and breathable membrane to the inside of the sheet metal box.

2. The lithium battery sheet metal case according to claim 1, wherein, The large hole section of the exhaust component is screwed to the fixing component, which is a stud whose shape is adapted to the inner diameter of the large hole section, and the inner wall of the large hole section is threaded.

3. The lithium battery sheet metal case according to claim 2, wherein, The through hole on the fastener is a polygonal hole, which serves as an operating hole to allow the fastener to be screwed in / out.

4. The lithium battery sheet metal case as claimed in claim 1, wherein, The exhaust structure also includes an exhaust pipe, and the top cover is also provided with a mounting hole. The small hole section is detachably connected and fixed to the mounting hole, and the exhaust pipe is detachably connected to the small hole section and extends out of the sheet metal box top cover.

5. The lithium battery sheet metal box according to claim 4, characterized in that, The exhaust pipe is screwed to the exhaust component.

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