A power battery cover plate structure

Abstract

The application discloses a power battery cover plate structure which comprises an exhaust assembly, a base plate and an explosion-proof valve. A center position of the base plate is provided with an exhaust hole, the explosion-proof valve and the exhaust assembly are installed in the exhaust hole, and the explosion-proof valve is arranged separately from the exhaust assembly. The exhaust assembly comprises a ring body, an elastic member, a baffle and an explosion-proof valve patch. The explosion-proof valve patch is arranged at a top position of the ring body, and the elastic member is arranged at a bottom position of the ring body. The elastic member is arranged horizontally and is arranged at two sides of the ring body respectively. One end of the spring is fixed to the ring body, and the other end is fixed to the baffle. The baffles at the two sides are matched and connected to cover the ring body. The power battery cover plate structure has the advantages of simple structure, compact matching, reasonable design and the like. Therefore, the power battery cover plate structure is a product with superior technical and economic performance.

Description

TECHNICAL FIELD

[0002] The application relates to a power battery cover plate structure. BACKGROUND

[0004] The explosion-proof valve patch of the battery cover plate is a safety device mainly used for new energy batteries to prevent explosion or fire of the battery under abnormal conditions such as overcharging, overdischarging, short circuit and the like. The explosion-proof valve patch is usually installed in the battery module, and the design thereof helps to rapidly release gas when the internal pressure of the battery abnormally rises, thereby reducing the internal pressure and protecting the safety and stability of the battery system.

[0005] Under normal working conditions, the explosion-proof valve patch remains in a closed state to ensure the sealing performance of the battery. When excessive heat is generated in the battery due to overcharging, short circuit or other reasons, causing the internal pressure to rise, the specific structure (such as a deformable diaphragm or a rupture disc) on the explosion-proof valve patch will deform or rupture under the action of pressure. This deformation or rupture will cause the valve to open, so that the high-pressure gas in the interior is released to the external environment, thereby reducing the pressure in the battery and avoiding the rupture of the battery shell due to excessive pressure.

[0006] The existing explosion-proof valve patch structure is difficult to recover after being damaged by stress, which inevitably leads to continuous leakage of substances in the battery. In view of this problem, the exhaust structure of the battery cover plate is improved, and a new structural scheme is proposed. SUMMARY

[0008] To at least solve one of the above problems, the application proposes a new structural scheme. The power battery cover plate structure adopts the following technical scheme:

[0009] A power battery cover plate structure, which comprises an exhaust assembly, a base plate and an explosion-proof valve. The center of the base plate is provided with an exhaust hole, and the explosion-proof valve and the exhaust assembly are installed in the exhaust hole, and the explosion-proof valve and the exhaust assembly are arranged separately.

[0010] The exhaust assembly comprises a ring body, an elastic member, a baffle and an explosion-proof valve patch. The explosion-proof valve patch is arranged at the top of the ring body, and the elastic member is arranged at the bottom of the ring body.

[0011] The elastic member is arranged transversely, and the elastic member is arranged on both sides of the ring body. One end of the spring is fixed to the ring body, and the other end is fixed to the baffle. The baffles on both sides are connected to cover the ring body.

[0012] Preferably, the baffle is composed of a plurality of baffle pieces, and the baffle pieces are provided with through holes for the spring to pass through, so that the spring is completely accommodated in the baffle.

[0013] Preferably, a metal sheet is bonded at the connection of the baffles on both sides.

[0014] Preferably, the metal sheet is provided with a notch.

[0015] Preferably, the battery cover plate further comprises a post and a lower insulating plate, and the substrate is connected to the lower insulating plate.

[0016] Preferably, the substrate and the lower insulating plate are provided with post holes on both sides, and the post is installed in the post hole.

[0017] Preferably, the post comprises a terminal, a ceramic ring, a sealing ring and a welding ring, the post hole of the lower insulating plate extends out a convex ring, and the welding ring is fixed to the convex ring; the terminal is exposed to the end surface of the substrate.

[0018] The present application has the following advantages compared with the prior art:

[0019] The existing explosion-proof valve patch structure is difficult to recover after being damaged by stress, which inevitably leads to continuous leakage of substances in the battery; therefore, in the present structure scheme, an exhaust assembly is arranged at the upper end position of the exhaust hole, and an explosion-proof valve is arranged at the lower end position of the exhaust hole; meanwhile, the exhaust assembly comprises a ring body, an elastic member, a baffle and an explosion-proof valve patch, the elastic member and the baffle are connected together and arranged on both sides of the bottom position of the ring body, and the explosion-proof valve patch is arranged at the top position of the ring body. When the explosion-proof sheet and the explosion-proof sheet patch are damaged, the baffle can effectively limit the continuous discharge of the substances in the battery, so as to avoid continuous pollution of the environment as much as possible. It has the advantages of simple structure, compact cooperation, reasonable design, etc.; therefore, it is a product with superior performance in technology and economy. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 The power battery cover plate structure schematic diagram in the preferred embodiment provided by the present application is shown in the figure;

[0022] Fig. 2 The power battery cover plate cross section schematic diagram in the preferred embodiment provided by the present application is shown in the figure;

[0023] Fig. 3 The exhaust assembly schematic diagram in the preferred embodiment provided by the present application is shown in the figure;

[0024] Fig. 4 The exhaust assembly cross section schematic diagram in the preferred embodiment provided by the present application is shown in the figure;

[0025] Fig. 5 The baffle schematic diagram in the preferred embodiment provided by the present application is shown in the figure;

[0026] Fig. 6 The baffle schematic diagram in the preferred embodiment provided by the present application is shown in the figure;

CONCRETE EMBODIMENT

[0028] The embodiments of the present invention are described in detail below. Examples of the 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.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "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 also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of the present invention, making the technical solution and its beneficial effects clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the invention.

[0031] The preferred embodiments provided by the present invention are as follows: Figs. 1-6 As shown, a power battery cover structure includes an exhaust assembly 1, a base plate 2, and an explosion-proof valve 3. An exhaust hole 21 is provided at the center of the base plate 2, and the explosion-proof valve 3 and the exhaust assembly 1 are installed within the exhaust hole 21, with the explosion-proof valve 3 and the exhaust assembly 1 separated. The battery cover also includes terminal posts 4 and a lower insulating plate 5, with the base plate 2 connected to the lower insulating plate 5. Terminal post holes 26 are provided on both sides of the base plate 2 and the lower insulating plate 5, and the terminal posts 4 are installed in the terminal post holes 26. The terminal post 4 includes a terminal 41, a ceramic ring 42, a sealing ring 43, and a welding ring 44. The terminal 41 includes a positive terminal and a negative terminal. The components are interconnected to form the entire terminal post 4. A protruding ring 22 extends from the terminal post hole 26 of the lower insulating plate 5, and the welding ring 44 is fixed to the protruding ring 22. The terminal 41 protrudes from the end face of the base plate 2.

[0032] The exhaust assembly 1 includes a ring 11, an elastic element 12, a baffle 13, and an explosion-proof valve patch 6. The elastic element 12 is a spring and is a single piece, while the baffle is a segmented structure. The explosion-proof valve patch 6 is located at the top of the ring 11, and the elastic element 12 is located at the bottom of the ring 11. The baffle 13 is composed of several baffles 14, and each baffle 14 has a through hole 15 for the spring to pass through, so that the spring is completely retracted into the baffle 13.

[0033] The elastic member 12 is arranged transversely and is arranged on both sides of the ring body 11. One end of the spring is fixed to the ring body 11, and the other end is fixed to the baffle 13. The two baffles 13 are matched and connected to cover the ring body 11. The connection part of the two baffles is bonded with a metal sheet 23. The metal sheet 23 is arranged with a notch 24. The notch is used to increase the surface area, so as to better diffuse the gas and dissipate heat, and reduce the heat generated by the battery during overcharge or overdischarge.

[0034] Under normal working conditions, the explosion-proof valve patch 6 remains closed to ensure the sealing performance of the battery. When excessive heat is generated inside the battery due to overcharging, short circuit or other reasons, causing the internal pressure to rise, the special structure on the explosion-proof valve patch 6 (such as a deformable diaphragm or a rupture disc) will deform or rupture under the action of pressure. This deformation or rupture will cause the valve to open, allowing the internal high-pressure gas to be released to the external environment, thereby reducing the internal pressure of the battery and preventing the battery case from being broken due to excessive pressure.

[0035] The existing explosion-proof valve patch structure is difficult to recover after being damaged by stress, which inevitably leads to continuous leakage of substances in the battery. Therefore, in the present structure, an exhaust assembly 1 is arranged at the upper end position of the exhaust hole 21, and an explosion-proof valve 3 is arranged at the lower end position of the exhaust hole 21. The exhaust assembly 1 includes a ring body 11, an elastic member 12, a baffle 13 and an explosion-proof valve patch 6. The elastic member 12 and the baffle 13 are connected together and arranged on both sides of the bottom position of the ring body 11. The explosion-proof valve patch 6 is arranged at the top position of the ring body 11. The baffle 13 is located between the explosion-proof valve 3 and the explosion-proof valve patch 6. The area of a single baffle 13 is slightly smaller than one-half of the cross-sectional area of the ring body 11. The two baffles 13 can maximize the closure of the cross-sectional area of the ring body 11. The baffle 13 has elastic activity under the action of the spring. Further, the baffle 13 is composed of a plurality of baffle plates 14. The baffle plates 14 are independent of each other. The baffle plates 14 are provided with through holes 15 for the spring to pass through, avoiding the spring to be exposed, and also ensuring the compact connection of the baffle plates 14 to ensure the air tightness of the baffle 13. Each baffle plate 14 of the baffle 13 has elasticity, so the baffle 13 can deform locally and adapt automatically according to the impact force of the released gas. When the internal reaction of the battery is intense and the impact force is large, the gas breaks through the explosion-proof valve 3 and then pushes the baffle 13 to deform, further breaking the explosion-proof valve patch 6 to discharge the gas. When the gas gradually decreases and the explosion-proof valve 3 and the explosion-proof valve patch 6 have been damaged and cannot be recovered, the baffle plates 14 play a role at this time. The reduced impact force can still push the spring of the baffle 13 to act, so as to deform the local baffle plates 14 to continue discharging the gas. When the impact force is not enough to push the spring to deform, the two baffles 13 will rejoin to limit the discharge of the substances in the battery. The spring force can be determined according to the design requirements of the battery.

[0036] In the description, the use of terms "one embodiment", "preferably", "in an example", "in a specific example" or "in some examples" etc. means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application and is not necessarily included in all embodiments or examples. Also, the specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0037] From the above description of structure and principles, it should be understood that the present application is not limited to the particular embodiments described above, and modifications and alternatives of the technology known in the art can be made on the basis of the present application, and all of these modifications and alternatives are within the scope of the present application, which is defined by the claims.

Claims

1. A power battery cover structure, characterized in that: It includes an exhaust assembly, a base plate, and an explosion-proof valve; the base plate has an exhaust hole at its center, the explosion-proof valve and the exhaust assembly are installed in the exhaust hole, and the explosion-proof valve is separated from the exhaust assembly. The exhaust assembly includes a ring, an elastic element, a baffle, and an explosion-proof valve patch; the explosion-proof valve patch is located at the top of the ring, and the elastic element is located at the bottom of the ring. The elastic element is arranged horizontally, and the elastic element is respectively located on both sides of the ring body; one end of the spring is fixed to the ring body, and the other end is fixed to the baffle. The baffles on both sides are connected to cover the ring body. The baffle is composed of several baffles, and the baffles have through holes for the spring to pass through, so that the spring is completely retracted into the baffle. An exhaust assembly is installed at the upper end of the exhaust port, and an explosion-proof valve is installed at the lower end of the exhaust port; the elastic element and the baffle are connected together and are installed on both sides at the bottom of the ring body, with the baffle located between the explosion-proof valve and the explosion-proof valve patch.

2. The power battery cover structure according to claim 1, characterized in that: Thin metal sheets are bonded to the joints of the two side panels.

3. The power battery cover structure according to claim 2, characterized in that: The metal sheets are arranged with grooves.

4. The power battery cover structure according to claim 1, characterized in that: The battery cover also includes terminals and a lower insulating plate, with the substrate connected to the lower insulating plate.

5. The power battery cover structure according to claim 4, characterized in that: The substrate and the lower insulating plate are provided with pole post holes on both sides, and the pole posts are installed in the pole post holes.

6. The power battery cover structure according to claim 5, characterized in that: The pole includes a terminal, a ceramic ring, a sealing ring, and a welding ring. A protruding ring extends from the pole hole of the lower insulating plate, and the welding ring is fixed to the protruding ring. The terminal protrudes from the end face of the substrate.

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