Upper cover of battery

Abstract

The utility model discloses a battery upper cover. A water impact prevention mechanism which is integrally formed with the upper cover in an injection molding manner is arranged at an exhaust hole in one side wall of the upper cover; the water impact prevention mechanism comprises a water impact prevention cover arranged at the exhaust hole in a covering mode. The inner end face of the waterproof impact cover is provided with convex ribs which protrude towards the interior of the upper cover and are used for welding the waterproof breathable film. The water impact prevention cover comprises a water baffle parallel to the side wall and a flow guide cover used for connecting the edge of the upper portion of the water baffle to the side wall. According to the waterproof upper cover structure with the breathable film, the breathable film is welded with the upper cover, and the waterproof structure is arranged on the outer side of the breathable film, so that the functions of balancing the pressure inside and outside a battery pack and quickly exhausting and releasing pressure during thermal runaway are realized, and the problem that the breathable film is broken due to the fact that high-pressure water flow directly impacts the breathable film during car washing can be solved; and meanwhile, the complicated processes of pre-embedding nuts in the upper cover and installing an anti-explosion ventilation valve during production can be avoided, the cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of new energy batteries, and specifically relates to a battery cover. Background Technology

[0002] Currently, there are generally two types of explosion-proof valves on battery covers. Type 1: The waterproof and breathable membrane is directly glued or welded to the casing, with no external protective measures. Figure 1 As shown; Form 2: Nuts are pre-embedded inside the top cover, and the explosion-proof vent valve is fixed to the housing by torque threading, as shown. Figure 2 As shown, it has the following shortcomings: While the first type of venting membrane can balance the internal and external pressures of the battery pack and meet the need for rapid venting and depressurization in case of thermal runaway, in practical applications, the high-pressure water flow during car washing directly impacts the venting membrane, causing it to rupture and resulting in the loss of the entire battery pack's functionality. This necessitates replacement or repair of the battery pack, significantly increasing maintenance costs. Although the second type can achieve both pressure balance and depressurization in case of thermal runaway, and also avoids direct water impact on the venting membrane during car washing, it requires pre-embedded metal nuts inside the top cover, and torque-locking of the explosion-proof venting valve is required during battery pack production. This not only increases material and production costs but also reduces production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a waterproof and impact-resistant battery cover with a breathable membrane, which not only meets the needs of balancing the internal and external pressure of the battery pack and venting and depressurizing in case of thermal runaway, but also avoids the problem of water flow directly impacting the breathable membrane and causing it to rupture. At the same time, it can reduce costs and improve production efficiency.

[0004] The technical solution adopted by this utility model is as follows: a battery cover, wherein a waterproof impact mechanism integrally injection molded with the cover is provided at the vent hole on one side wall of the cover;

[0005] The waterproof impact mechanism includes a waterproof impact cover installed over the vent hole; the inner end face of the waterproof impact cover is provided with a rib that protrudes upwards and is used for welding a waterproof and breathable membrane.

[0006] The waterproof impact shield includes a water baffle plate arranged parallel to the side wall and a flow guide for connecting the upper edge of the water baffle plate to the side wall.

[0007] It also includes an exhaust plate for connecting the lower edge of the baffle to the side wall.

[0008] The exhaust plate has multiple exhaust ports.

[0009] The width R of the rib W The thickness is 0.3~0.8mm, and the diameter R is... T It is 0.3~0.5mm.

[0010] The water baffle is circular, the outer contour of the flow guide cover is a semicircular table structure, and the joint part of the flow guide cover and the exhaust plate is a eave structure facilitating water flow.

[0011] The exhaust plate is circular arc-shaped, and the outer diameter of the exhaust plate is equal to the outer diameter of the water baffle.

[0012] The upper part of the water baffle is trapezoidal, and the lower part is semicircular; the outer contour of the flow guide cover comprises a plane and inclined planes on both sides of the plane facilitating rapid water flow.

[0013] The side connected to the outer wall of the plane is higher than the side connected to the water baffle; the plane is trapezoidal, and the inclined planes are trapezoidal.

[0014] The exhaust plate is circular arc-shaped, and the outer diameter of the exhaust plate is equal to the diameter of the semicircle of the lower part of the water baffle.

[0015] The inner hole diameter D1 of the inner end of the waterproof impact cover is 1-2 mm smaller than the inner hole diameter D2 of the exhaust hole.

[0016] Compared with the prior art, the waterproof impact cover with a breathable film provided by the utility model has the advantages that the breathable film and the upper cover are welded, the waterproof impact structure is arranged on the outer side of the breathable film, the functions of balancing the pressure inside and outside the battery pack and rapidly exhausting and relieving pressure when thermal runaway occurs are realized, the problem that the breathable film is broken due to direct impact of high-pressure water flow during car washing is avoided, the pre-buried nut in the upper cover and the complex process of installing the explosion-proof breather valve during production are avoided, the cost is reduced, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a structural schematic view of the prior art 1.

[0019] Figure 2 It is a structural schematic view of the prior art 2.

[0020] Figure 3 It is a structural schematic view of the embodiment 1 of the utility model.

[0021] Figure 4 It is a structural schematic view of the waterproof impact structure part of the embodiment 1.

[0022] Figure 5 is the front view of the waterproof impact structure part of example one.

[0023] Figure 6 is the sectional view of the waterproof impact structure part of example one.

[0024] Figure 7 is the structural schematic view of the utility model embodiment two.

[0025] Figure 8 is the structural schematic view of the utility model embodiment three.

[0026] Figure 9 is the structural schematic view of the utility model embodiment four. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without carrying out creative labor belong to the protection scope of the utility model.

[0028] The technology, method and equipment known to the ordinary skilled in the related field can not be discussed in detail, but should be regarded as part of the authorized description under appropriate circumstances.

[0029] Please refer to Figures 3-6 : The upper cover 1 is provided with a positive terminal A and a negative terminal B. The waterproof impact mechanism 11 integrally injection molded with the upper cover is arranged at the exhaust hole 10 on the side wall of the upper cover. The waterproof impact structure 11 of the upper cover can avoid the direct impact of water flow on the waterproof and breathable film during car washing, causing the waterproof and breathable film to be broken, and the waterproof impact structure 11 is designed as an inclined roof structure, which is beneficial to the rapid flow of water and avoids the accumulation of water. The exhaust plate 1103 can be used for the discharge and entry of gas under normal pressure balance, and can also be used for the rapid discharge of the gas inside the battery pack in thermal runaway. The waterproof impact mechanism 11 includes a waterproof impact cover arranged at the exhaust hole. The inner hole diameter D1 of the inner end of the waterproof impact cover is 1-2mm smaller than the exhaust hole inner diameter D2. The inner end surface 111 of the waterproof impact cover is provided with a convex rib 1112 protruding into the interior of the upper cover and used for welding the waterproof and breathable film 2. The width R W of the convex rib 1112 is 0.3-0.8mm, and the thickness R TThe waterproof and breathable film 2 is welded to the convex rib 1112 by hot melting after the upper cover 1 is injection molded, and the waterproof and breathable film is made of e-PTFE material. The waterproof and breathable film can also be welded by ultrasonic welding.

[0030] The water baffle 1101 is circular, the outer contour 11021 of the flow guide cover 1102 is in a semicircular table structure, and the joint part of the flow guide cover 1102 and the exhaust plate 1103 is in a eave shape 11022 facilitating water flow. The exhaust plate 1103 is in a circular arc shape, and the outer diameter of the exhaust plate 1103 is equal to the outer diameter of the water baffle 1101. The exhaust plate 1103 is provided with exhaust ports 1104.

[0031] The waterproof impact structure 11 can also be provided as shown in the structure, wherein the water baffle 1101 is circular, and the outer contour of the flow guide cover 1102 is in a semicircular table structure. Figure 7 The water baffle 1101 is circular, and the outer contour of the flow guide cover 1102 is in a semicircular table structure.

[0032] The waterproof impact structure 11 can also be provided as shown in the structure, wherein the water baffle 1101 is circular, and the outer contour of the flow guide cover 1102 is in a semicircular table structure. Figure 8 The water baffle 1101 is circular, and the outer contour of the flow guide cover 1102 is in a semicircular table structure.

[0033] The greater the contact area of the waterproof and breathable film and the plastic welding, the greater the welding depth, and the greater the welding strength. The welding strength of the waterproof and breathable film can be controlled by controlling the width, thickness (such as shown in the structure of Figure 9 The greater the contact area of the waterproof and breathable film and the plastic welding, the greater the welding depth, and the greater the welding strength. The welding strength of the waterproof and breathable film can be controlled by controlling the width, thickness (such as shown in the structure of

[0034] The above only describes exemplary embodiments of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery upper cover, characterized by: The upper cover (1) is provided with a waterproof impact prevention mechanism (11) integrally injection molded with the upper cover at the exhaust hole (10) of one side wall; The waterproof impact prevention mechanism (11) comprises a waterproof impact cover arranged at the exhaust hole; an inner end face (111) of the waterproof impact cover is provided with a convex rib (1112) protruding towards the inside of the upper cover and used for welding a waterproof and breathable film (2); The waterproof impact cover comprises a water baffle (1101) arranged in parallel with the side wall and a flow guide cover (1102) used for connecting the upper edge of the water baffle (1101) to the side wall.

2. The battery upper cover according to claim 1, characterized in that: Further comprising an exhaust plate (1103) used for connecting the lower edge of the water baffle (1101) to the side wall.

3. The battery upper cover according to claim 2, characterized in that: A plurality of exhaust ports (1104) are arranged on the exhaust plate (1103).

4. The battery upper cover according to claim 1, wherein: The width R of the rib (1112) W The thickness is 0.3~0.8mm, and the diameter R is... T It is 0.3~0.5mm.

5. The battery upper cover of claim 2, wherein: The water baffle (1101) is circular; the outer contour (11021) of the flow guide cover (1102) is in a semicircular table structure, and the joint part of the flow guide cover (1102) and the exhaust plate (1103) is in a eave shape (11022) facilitating water flow.

6. The battery upper cover according to claim 5, characterized in that: The exhaust plate (1103) is in an arc shape, and the outer diameter of the exhaust plate (1103) is equal to the outer diameter of the water baffle (1101).

7. The battery upper cover of claim 2, wherein: The upper part of the water baffle (1101) is in a trapezoidal shape, and the lower part is in a semicircular shape; the outer contour of the flow guide cover (1102) comprises a plane (11023) and inclined surfaces (11024) arranged on both sides of the plane to facilitate rapid water flow.

8. The battery upper cover according to claim 7, characterized in that: The side (110231) connected to the outer wall of the plane (11023) is higher than the side (110232) connected to the water baffle; the plane (11023) is in a trapezoidal shape, and the inclined surfaces (11024) are in a trapezoidal shape.

9. The battery upper cover of claim 7, wherein: The exhaust plate (1103) is in an arc shape, and the outer diameter of the exhaust plate (1103) is equal to the diameter of the lower semicircle of the water baffle (1101).

10. The battery upper cover of claim 1, wherein: The inner hole diameter D1 of the inner end of the waterproof impact cover is 1-2 mm smaller than the inner diameter D2 of the exhaust hole.

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