Battery cover plate structure with explosion-proof pole

Abstract

The utility model discloses a battery cover plate structure with anti -explosion formula pole post, including top cover piece, it has the through -hole, top cover piece is in the through -hole's outer periphery edge position and extends the wall edge that forms along the height direction, and this wall edge forms the baffle edge with a certain angle to the direction of through -hole and is folded, the through -hole inner wall of top cover piece extends and forms the supporting ring to the axial direction, the supporting ring is corresponding with baffle edge setting, double -deck pole post structure, it is installed in the through -hole, and is limited between baffle edge and supporting ring, the double -deck pole post structure includes upper pole post and lower pole post, the upper pole post covers and closes on lower pole post top, and the sealed cavity is formed between both, the lower pole post forms the gas hole that communicates with the sealed cavity, the utility model discloses technical scheme, simple structure, easy to realize and low cost, combine with the pole post structure to simplify the cover plate overall structure, save the layout space.

Description

Technical Field

[0001] This utility model relates to the field of battery cover technology, specifically to a battery cover structure with explosion-proof terminals. Background Technology

[0002] In extreme conditions, existing lithium-ion batteries can generate a large amount of gas inside, causing a sharp increase in pressure and posing an explosion risk. To address this, power battery covers are typically equipped with explosion-proof valves. When the internal pressure exceeds a set value, the tear in the explosion-proof valve ruptures to release the pressure and expel the gas from the battery, thus ensuring battery safety.

[0003] However, in the existing technology, the explosion-proof valve is usually installed as a separate component on the battery cover plate, which requires the reservation of mounting holes on the top cover plate. This not only increases the structural complexity of the battery cover plate, but also occupies a certain amount of limited space. At the same time, the assembly process of the independent explosion-proof valve and the top cover plate may not only cause problems such as poor sealing and insufficient assembly accuracy, but also increase the number of parts and assembly steps, thus increasing manufacturing costs. Utility Model Content

[0004] This utility model provides a battery cover structure with explosion-proof terminals. Its structure is simple, easy to implement, and low in cost. It combines explosion-proof functionality with the terminal structure to simplify the overall cover structure and save layout space. The main technical solutions adopted are as follows:

[0005] A battery cover structure with explosion-proof terminals includes a top cover sheet having a through hole. A wall edge extends along the height direction from the outer periphery of the through hole, and this wall edge is folded at a certain angle towards the through hole to form a retaining edge. A supporting ring extends from the inner wall of the through hole towards the axis, and the supporting ring is correspondingly positioned to the retaining edge. A double-layer terminal structure is installed within the through hole and confined between the retaining edge and the supporting ring. The double-layer terminal structure includes an upper terminal and a lower terminal, with the upper terminal covering the lower terminal and forming a sealed cavity between them. The lower terminal has a vent hole communicating with the sealed cavity. The outer periphery of the upper terminal includes a tear wall and at least two supporting walls, the thickness of which is less than the thickness of the supporting walls, and the tear wall is located between adjacent supporting walls. An insulating structure is disposed between the top cover sheet and the double-layer terminal structure.

[0006] Preferably, the insulation structure includes an upper insulating ring and a lower insulating ring distributed vertically; the lower insulating ring is disposed above the support ring and located between the support ring and the lower pole post, and the upper insulating ring is located between the retaining edge and the upper pole post.

[0007] Preferably, the lower insulating ring has an "L" shaped cross-section, including a bottom ring and a vertical ring integrally formed on the upper end face of the bottom ring; the bottom surface of the lower pole post is in contact with the bottom ring, and the side surface is in contact with the vertical ring; the upper insulating ring is pressed onto the upper vertical ring and acts on the upper pole post.

[0008] Preferably, the upper end face of the lower electrode post is recessed with a lower slot, and the air vent is disposed on the slot; the upper electrode post is provided with an upper slot corresponding to the lower slot; when the upper electrode post is closed on top of the lower electrode post, the upper slot and the lower slot are combined to form the sealing cavity.

[0009] Preferably, there are two support walls, which are symmetrically distributed on the outer periphery of the upper pole column.

[0010] Preferably, the retaining edge is arranged parallel to the supporting ring.

[0011] Preferably, an exhaust space is formed between the torn wall and the wall edge, the exhaust space being used to communicate with the outside of the battery cover.

[0012] Preferably, the folding angle of the wall edge is 90 degrees.

[0013] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following beneficial effects:

[0014] (1) This utility model provides a battery cover structure with explosion-proof terminals. Its structure is simple, easy to implement, and low in cost. It combines explosion-proof functionality with the terminal structure to simplify the overall cover structure and save layout space. The technical solution of this utility model deeply integrates explosion-proof functionality with the terminal structure. Through the combined design of a thinner tear wall and a thicker support wall on the upper terminal, pressure can be accurately and reliably released when the internal pressure of the battery is abnormal. This method directly eliminates the need for a separate explosion-proof valve component, greatly simplifying the overall structure of the battery cover, saving layout space, and reducing the number of parts and manufacturing costs.

[0015] (2) In this technical solution, by setting an upper insulating ring and a lower insulating ring distributed vertically, the external conduction through the battery cover plate and the inside of the battery is prevented, and all-round conductive insulation isolation in both directions of the double-layer pole structure is achieved, ensuring the insulation reliability between the top cover plate and the pole, and improving the safety performance of the battery.

[0016] (3) In this technical solution, there are two support walls that are symmetrically arranged on the outer periphery of the upper pole column. In this way, the two support walls can effectively provide stable support for the tear wall between adjacent support walls, and avoid the tear wall from deforming or tilting due to its thinness. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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 based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the battery cover plate according to an embodiment of the present utility model;

[0019] Figure 2 This is an exploded view of the battery cover plate according to an embodiment of the present invention. Figure 1 ;

[0020] Figure 3 This is an exploded view of the battery cover plate according to an embodiment of the present invention. Figure 2 ;

[0021] Figure 4 This is a cross-sectional view of the battery cover before the terminal post is installed in an embodiment of this utility model;

[0022] Figure 5 This is a cross-sectional view of the battery cover plate without the terminal posts installed in an embodiment of this utility model.

[0023] The annotations in the attached figures are explained as follows:

[0024] 1. Top cover plate; 11. Through hole; 12. Wall edge; 121. Edge retaining; 13. Support ring;

[0025] 2. Double-layer pole structure; 21. Upper pole; 211. Tear wall; 212. Support wall; 213. Upper slot; 22. Lower pole; 221. Vent hole; 222. Lower slot; 2a. Sealing cavity; 2b. Exhaust space;

[0026] 31. Upper insulating ring; 32. Lower insulating ring; 321. Bottom ring; 322. Vertical ring. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0028] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0029] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does 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, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0030] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0031] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0032] Please see Figures 1 to 5 .

[0033] This embodiment provides a battery cover structure with explosion-proof terminals. Its structure is simple, easy to implement, and low in cost. It combines explosion-proof functionality with the terminal structure to simplify the overall cover structure and save layout space. The technical solution of this utility model mainly includes a top cover 1, a double-layer terminal structure 2, and an insulation structure. (See also...) Figure 1 The positive electrode post structure shown in this embodiment of the battery cover plate structure; wherein,

[0034] Top cover plate 1, see Figure 2 It has a through hole 11, and the top cover plate 1 extends along the height direction at the outer peripheral edge of the through hole 11 to form a wall edge 12; see Figure 4 The wall edge 12 is folded at a certain angle towards the through hole 11 to form a retaining edge 121; see also Figure 4 The inner wall of the through hole 11 of the top cover plate 1 extends toward the axial direction to form a support ring 13, and the support ring 13 is correspondingly arranged with the side guard 121; in this embodiment, the folding angle of the side guard 12 is 90 degrees, and the side guard 121 and the support ring 13 are arranged parallel to each other.

[0035] Double-layer pole structure 2, see Figure 5It is installed in the through hole 11 and is confined between the retaining edge 121 and the supporting ring 13; the double-layer pole structure 2 includes an upper pole 21 and a lower pole 22, the upper pole 21 covers the lower pole 22 and a sealed cavity 2a is formed between the two; the lower pole 22 forms a vent 221 that communicates with the sealed cavity 2a, the vent 221 can conduct the battery box interior to the sealed cavity 2a so that gas can be discharged through the battery box interior to the sealed cavity 2a.

[0036] In this embodiment, the outer periphery of the upper pole post 21 includes a tear wall 211 and at least two support walls 212. The thickness of the tear wall 211 is less than the thickness of the support walls 212. The tear wall 211 is located between adjacent support walls 212, and the two support walls 212 are symmetrically distributed on the outer periphery of the upper pole post 21. Specifically, see [link to documentation]. Figure 3 In this embodiment, in order to ensure the fixing effect of the tear wall 211 without tilting or deformation, it is preferable to have four support walls 212, with every two support walls 212 symmetrically arranged on the outer periphery of the upper pole post 21.

[0037] In this embodiment, participants Figure 4 and Figure 5 The upper end face of the lower electrode post 22 is recessed with a lower slot 222, and the air vent 221 is provided on the slot; Figure 5 The upper pole post 21 is provided with an upper empty groove 213 corresponding to the lower empty groove 222. When the upper pole post 21 covers the lower pole post 22, the upper empty groove 213 and the lower empty groove 222 merge to form the sealing cavity 2a. In this embodiment, the upper empty groove 213 and the lower empty groove 222 effectively increase the initial volume of the sealing cavity 2a, so that it can play a certain buffering role in the early stage of pressure accumulation and ensure that there is a sufficient pressure value of gas action area on the tear wall 211 to burst the tear wall 211.

[0038] In this embodiment, in order to ensure that the gas can be smoothly discharged to the outside of the top cover plate 1 when the tear is burst, an exhaust space 2b is designed between the tear wall 211 and the wall side 12. The exhaust space 2b is used to communicate with the outside of the battery cover plate.

[0039] In this embodiment, see Figure 4 The insulation structure includes an upper insulating ring 31 and a lower insulating ring 32 distributed vertically; the lower insulating ring 32 is disposed above the support ring 13 and located between the support ring 13 and the lower pole post 22; see also Figure 5 The upper insulating ring 31 is located between the retaining edge 121 and the upper electrode post 21. Thus, by setting the upper insulating ring 31 and the lower insulating ring 32 distributed vertically, conductivity between the outside and the inside of the battery is prevented through the battery cover plate, achieving all-round conductive insulation isolation in both the upper and lower directions of the double-layer electrode post structure 2, ensuring the insulation reliability between the top cover plate 1 and the electrode post, and guaranteeing safety.

[0040] In this embodiment, see Figure 4 and Figure 5 The insulating ring has an "L"-shaped cross-section, comprising a bottom ring 321 and a vertical ring 322 integrally formed on the upper end face of the bottom ring 321; see also Figure 5 The bottom surface of the lower electrode post 22 contacts the bottom ring 321, and the side surface contacts the vertical ring 322; the upper insulating ring 31 is pressed against the upper ring 322 and acts on the upper electrode post 21. In this embodiment, the insulating ring with an "L"-shaped cross-section is designed mainly to enable the lower electrode post 22 to be better positioned in a surrounding manner, to prevent the lower electrode post 22 from shifting, and to prevent the side walls of the lower electrode post 22 and the upper electrode post 21 from contacting the inner wall of the through hole 11 of the top cover plate 1.

[0041] In this embodiment, both the upper insulating ring 31 and the lower insulating ring 32 also have a sealing function, and they are mainly made of rubber and plastic.

[0042] In this embodiment, a waterproof and breathable membrane (not shown) is provided below the top cover plate 1, and the anti-detachment breathable membrane is also located below the lower electrode post 22 to prevent battery fluid from entering the sealed cavity 2a through the vent hole 221.

[0043] The working principle and usage process of this utility model:

[0044] During the manufacturing process of the battery cover structure, firstly, the top cover plate 1, upper electrode post 21, lower electrode post 22, upper insulating ring 31, and lower insulating ring 32 are prepared; then, see... Figure 2 Place the lower insulating ring 32, lower electrode post 22, upper electrode post 21, and upper insulating ring 31 in sequence into the through hole 11 of the top cover plate 1; see Figure 5 At this time, the bottom surface of the lower electrode 22 is in contact with the bottom ring 321 of the lower insulating ring 32, and the sides of the lower electrode 22 and the upper electrode 21 are in contact with the vertical ring 322. The lower electrode 22 and the upper electrode 21 are concentrically positioned in the through hole 11. The lower insulating ring 32 achieves conductive isolation between the lower electrode 22, the upper electrode 21 and the inner wall of the through hole 11. Finally, the wall edge 12 is folded 90 degrees toward the through hole 11 by an external press to form a retaining edge 121. The retaining edge 121 acts on the upper end of the upper insulating ring 31, so that the upper insulating ring 31 is located between the retaining edge 121 and the upper electrode 21, thereby achieving conductive isolation between the upper electrode 21 and the retaining edge 121.

[0045] When the battery cover structure is installed on the battery box and the battery is operating normally, the double-layer terminal structure 2 performs the current transmission function. When the internal pressure of the battery rises abnormally due to abuse conditions such as overcharging or short circuits, high-pressure gas enters the sealed cavity 2a formed by the upper and lower terminals 21 through the vent 221 of the lower terminal 22. As the pressure continues to accumulate, the gas in the sealed cavity 2a exerts an outward force on the tear wall 211 of the upper terminal 21. Since the thickness of the tear wall 211 is significantly smaller than that of the adjacent support wall 212, its mechanical strength is low. When the gas pressure inside the cavity reaches its designed rupture threshold, the tear wall 211 tears and ruptures to form a pressure relief port. The high-pressure gas instantly passes through this pressure relief port and enters the exhaust space 2b between the tear wall 211 and the wall edge 12 of the top cover 1, and is eventually quickly discharged to the outside of the battery, releasing the excessive internal pressure in a timely manner and effectively preventing the risk of battery explosion. Therefore, this invention deeply integrates explosion-proof functionality with the terminal post structure. Through the combined design of the thinner tear wall 211 and the thicker support wall 212 on the upper terminal post 21, pressure can be accurately and reliably released through the tear wall 211 when the internal pressure of the battery is abnormal. This method directly eliminates the need for a separate explosion-proof valve component, greatly simplifying the overall structure of the battery cover, saving layout space, and reducing the number of parts and manufacturing costs.

[0046] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A battery cover structure with explosion-proof terminals, characterized in that: include A top cover plate has a through hole. A wall edge is formed on the outer periphery of the through hole along the height direction. The wall edge is folded at a certain angle toward the through hole to form a retaining edge. A supporting ring is formed on the inner wall of the through hole of the top cover plate toward the axis direction. The supporting ring is provided correspondingly to the retaining edge. A double-layer pole structure is installed in the through hole and is confined between the retaining edge and the supporting ring; The double-layer pole structure includes an upper pole and a lower pole. The upper pole covers the lower pole, and a sealed cavity is formed between them. The lower pole has a vent hole communicating with the sealed cavity. The outer periphery of the upper pole includes a tear wall and at least two support walls. The thickness of the tear wall is less than the thickness of the support walls, and the tear wall is located between adjacent support walls. An insulating structure is disposed between the top cover plate and the double-layer pole structure.

2. The battery cover structure with explosion-proof terminals as described in claim 1, characterized in that: The insulation structure includes an upper insulating ring and a lower insulating ring distributed vertically; the lower insulating ring is disposed above the support ring and between the support ring and the lower pole post, and the upper insulating ring is located between the retaining edge and the upper pole post.

3. The battery cover structure with explosion-proof terminals as described in claim 2, characterized in that: The lower insulating ring has an "L" shaped cross-section and includes a bottom ring and a vertical ring integrally formed on the upper end face of the bottom ring; the bottom surface of the lower pole is in contact with the bottom ring and the side surface is in contact with the vertical ring; the upper insulating ring is pressed on top of the vertical ring and acts on the upper pole.

4. The battery cover structure with explosion-proof terminals as described in claim 1, characterized in that: The upper end face of the lower electrode post is recessed with a lower slot, and the air vent is provided on the slot; the upper electrode post is provided with an upper slot corresponding to the lower slot; when the upper electrode post is closed on top of the lower electrode post, the upper slot and the lower slot are combined to form the sealing cavity.

5. The battery cover structure with explosion-proof terminals as described in claim 1, characterized in that: The support wall is provided in two parts, and the two support walls are symmetrically distributed on the outer periphery of the upper pole column.

6. The battery cover structure with explosion-proof terminals as described in claim 1, characterized in that: The retaining edge is arranged parallel to the supporting ring.

7. The battery cover structure with explosion-proof terminals as described in claim 1, characterized in that: An exhaust space is formed between the torn wall and the wall side, and the exhaust space is used to communicate with the outside of the battery cover.

8. The battery cover structure with explosion-proof terminals as described in claim 1, characterized in that: The folding angle of the wall is 90 degrees.

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