Battery cover plate and sodium battery

Abstract

The utility model discloses a battery cover plate and a sodium battery. The battery cover plate comprises a cover main body and a hole sealing structure, wherein a first through hole is formed in the cover main body; the hole sealing structure covers the first through hole, and a fragile area is formed on the hole sealing structure; wherein the easy-to-crack area has a closed state for closing the first through hole and a pressure relief state for at least partially forming an opening under the action of internal pressure of the battery to open the first through hole. According to the technical scheme provided by the utility model, the liquid injection efficiency of the battery can be effectively improved, the pressure is released more timely when the battery is abnormal, and the safety performance of the battery is better.

Description

Technical Field

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

[0002] As the smallest energy storage unit in modules and battery packs, the safety performance of individual battery cells is of paramount importance. The battery cover is a crucial structural component that directly impacts battery safety. Battery covers typically house an injection port and an explosion-proof valve, both usually designed as separate units. The injection port is welded and sealed, while the explosion-proof valve requires separate welding, increasing the cost of the cover components. Furthermore, on small battery covers, space constraints limit the area occupied by the injection port and explosion-proof valve, resulting in a relatively small injection port size. This affects injection efficiency, and a small explosion-proof valve may prevent timely pressure release in the event of battery malfunction, increasing the risk of explosion. Utility Model Content

[0003] To address the aforementioned technical problems, the main objective of this utility model is to provide a battery cover and a sodium battery, which aims to solve the problem that the traditional battery cover design limits the area occupied by the injection hole and the explosion-proof valve, thus affecting the injection efficiency and increasing the risk of explosion.

[0004] To achieve the above objectives, the present invention provides a battery cover, comprising:

[0005] A cover body, wherein a first through hole is provided on the cover body;

[0006] A sealing structure is provided at the first through hole, and a crack-prone area is formed on the sealing structure;

[0007] The crackable region has a closed state that seals the first through hole, and a depressurized state that, under the action of internal battery pressure, at least partially forms an opening to open the first through hole.

[0008] Optionally, the sealing structure is configured as a sealing pin, the sealing pin having a sealing head covering the first through hole, and the crack-prone area being located on the sealing head.

[0009] Optionally, the sealing head includes a sealing body and an opening portion disposed in the middle of the sealing body, and the crack-prone area is located on the opening portion;

[0010] When in the depressurized state, at least a portion of the opening part cracks open, and at least a portion of the opening part is connected to the sealing body.

[0011] Optionally, the thickness of the sealing head is gradually increased in the direction from the center of the sealing head toward the edge.

[0012] Optionally, the sealing structure includes a sealing body and an opening portion. The sealing body is disposed on the first through hole, and the opening portion is disposed on the sealing body and is located in the central area corresponding to the first through hole.

[0013] The sealing body is provided with a first pressure groove arranged in a ring shape and a plurality of second pressure grooves arranged to divide the first pressure groove. The first pressure groove and the plurality of second pressure grooves are arranged to cross each other. The inner ring side of the first pressure groove forms the opening part. The intersection of the plurality of second pressure grooves converges in the first pressure groove to form the crack-prone area.

[0014] Optionally, two second pressing grooves are provided, and the two second pressing grooves are arranged in a cross shape, wherein the thickness of the two second pressing grooves at the intersection is less than the thickness of the second pressing grooves at other positions.

[0015] Optionally, the first side of the cover body has a first protrusion, the first protrusion is circumferentially disposed on the outer periphery of the first through hole, and the surface of the first protrusion facing away from the first side has a groove.

[0016] The battery cover also includes a sealing element, which is disposed in the groove, and the sealing structure is pressed onto the sealing element.

[0017] Optionally, in the direction protruding from the first side of the cover body, the protrusion height of the seal is higher than the protrusion height h of the first protrusion, wherein h is 0.1 mm to 0.3 mm.

[0018] Optionally, the sealing structure is coaxially arranged with the first through hole and the first protrusion, and the outer periphery of the sealing structure is welded to the outer periphery of the first protrusion.

[0019] This utility model also provides a sodium battery, including the battery cover plate described above.

[0020] The technical solution provided by this utility model has the following beneficial effects:

[0021] The battery cover provided by this utility model includes a cover body and a sealing structure. A first through-hole is provided on the cover body, through which electrolyte can be injected into the battery. The sealing structure can seal the first through-hole to prevent electrolyte leakage. Furthermore, a crackable area is provided on the sealing structure. This crackable area has a closed state, sealing the first through-hole, and a pressure-relieving state, where it can at least partially open under internal battery pressure to open the first through-hole. When the sodium battery is operating normally, the crackable area is closed to ensure that the electrolyte inside the sodium battery does not leak out. When the sodium battery malfunctions, a large amount of gas is generated inside the sodium battery. Under the pressure of the gas, the crackable area can be broken open to form an opening, creating a pressure relief hole at the first through-hole. The gas can then be discharged from the first through-hole, thereby preventing battery explosion. Moreover, the first through-hole can serve as both an injection hole and a pressure relief hole, thus allowing for a larger opening size, effectively improving injection efficiency and enabling more timely pressure relief in case of battery malfunction, resulting in better battery safety. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of an embodiment of a battery cover provided by this utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of one embodiment of the sealing nail described herein;

[0025] Figure 3 for Figure 1 A schematic diagram of the structure of the cover body described in the figure;

[0026] Figure 4 for Figure 3 An enlarged structural schematic diagram of the cover body described in the figure.

[0027] Explanation of icon numbers:

[0028] 100-Battery cover plate; 1-Cover body; 11-First through hole; 12-First protrusion; 13-Groove; 2-Sealing structure; 21-Sealing nail; 211-Sealing body; 212-Opening part; 213-First pressure groove; 214-Second pressure groove; 3-Sealing element.

[0029] The realization of the purpose, functional characteristics and excellent effects of this utility model will be further explained below in conjunction with specific embodiments and accompanying drawings. Detailed Implementation

[0030] 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 only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] This utility model provides a battery cover 100. For details, please refer to [link / reference needed]. Figure 1 and Figure 3 In this embodiment, the battery cover 100 includes a cover body 1 and a sealing structure 2. A first through hole 11 is provided on the cover body 1. The sealing structure 2 is provided on the first through hole 11, and a crackable area is formed on the sealing structure 2. The crackable area has a closed state that closes the first through hole 11, and a pressure relief state that forms at least a partial opening to open the first through hole 11 under the action of internal battery pressure.

[0034] In this embodiment, a first through hole 11 is provided on the cover body 1, through which electrolyte can be injected into the battery. The sealing structure 2 can seal the first through hole 11 to prevent electrolyte leakage. Moreover, the sealing structure 2 is provided with a crackable area, which has a closed state that seals the first through hole 11 and a pressure-relieving state that, under the pressure inside the battery, at least partially forms an opening to open the first through hole 11. When the sodium battery is working normally, the crackable area is in a closed state to ensure that the electrolyte inside the sodium battery does not leak out. When the sodium battery fails abnormally, a lot of gas is generated inside the sodium battery. Under the pressure of the gas, the crackable area can be broken to form an opening, forming a pressure relief hole at the first through hole 11. The gas can be discharged from the first through hole 11, thereby preventing battery explosion. Moreover, the first through hole 11 can be both an injection hole and a pressure relief hole, so the opening of the first through hole 11 can be set to be larger, which can effectively improve the injection efficiency and the pressure relief is more timely when the battery is abnormal, thus improving the battery's safety performance.

[0035] The shape of the cover body 1 is adapted to fit the shape of a sodium battery. Preferably, it is combined with... Figure 1 and Figure 3 As shown, the cover body 1 is roughly disc-shaped, and the first through hole 11 is also circular. After the battery cover plate 100 is placed on the sodium battery body, battery fluid can be injected into the sodium battery through the first through hole 11. At the same time, the first through hole 11 can also serve as a pressure relief hole for the sodium battery. When the sodium battery malfunctions, the gas inside the sodium battery can be discharged through the first through hole 11 to prevent the battery from exploding.

[0036] The sealing structure 2 is used to open and close the first through hole 11 to ensure that the battery fluid inside the sodium battery will not leak when the sodium battery is working normally. When the sodium battery is malfunctioning, the sealing structure 2 can open the first through hole 11 in time so that the internal gas can be quickly discharged, thus better ensuring the safety of the sodium battery.

[0037] In one embodiment, the sealing structure 2 may include a movable portion disposed within the crack-prone area, which opens and closes the first through-hole 11. The movement of the movable portion is not specifically limited; for example, the movable portion may be configured to rotate, move linearly, reciprocate along a curve, or deform elastically. The movable portion can switch between the closed state and the depressurized state by rotating, moving linearly, or deforming. During depressurization, the movement or deformation of the movable portion opens the first through-hole 11 to better reduce the risk of explosion after battery failure.

[0038] Preferably, combined with Figure 1 and Figure 2As shown, the sealing structure 2 is configured as a sealing pin 21, which has a sealing head covering the first through hole 11, and the easily cracked area is located on the sealing head. The sealing pin 21 seals the first through hole 11 to ensure the normal operation of the sodium battery and prevent battery fluid leakage; on the other hand, the easily cracked area on the sealing head allows the first through hole 11 to be opened for pressure relief. The first through hole 11 allows for both liquid injection and venting, thus reducing the number of openings on the cover body 1, simplifying the manufacturing process of the cover body 1, and allowing for a larger opening size in the first through hole 11, resulting in higher liquid injection efficiency. Simultaneously, compared to a larger pressure relief hole, the pressure relief efficiency is also higher, reducing the risk of explosion after battery failure.

[0039] Furthermore, combined again Figure 1 and Figure 2 As shown, the sealing head includes a sealing body 211 and an opening portion 212 located in the middle of the sealing body 211. The easily crackable area is located on the opening portion 212. By placing the easily crackable area in the middle of the sealing body 211, it is ensured that after at least a portion of the easily crackable area is opened, the opening can communicate with the first through hole 11, thereby ensuring gas discharge. In the depressurization state, at least a portion of the opening portion 212 cracks and is connected to the sealing body 211. After the opening portion 212 cracks, the first through hole 11 is opened, thereby depressurizing. Moreover, the cracked opening portion 212 remains connected to the sealing body 211 to prevent the opening portion 212 from splashing out and causing a short circuit in the rest of the battery, thus improving the safety of the sodium battery.

[0040] Preferably, the sealing body 211 and the opening portion 212 are integrally formed, resulting in fewer components in the battery cover 100 and easier assembly. Furthermore, the thickness of the sealing head gradually increases from its center towards its edge. The central region of the sealing head is the thinnest; therefore, after the sodium battery fails, the opening portion 212 in the central region is most likely to crack first under pressure, thereby opening the first through hole 11.

[0041] The opening portion 212 can be configured in various shapes and positions. Preferably, such as... Figure 2As shown, the sealing body 211 has a first pressure groove 213 arranged in a ring shape and multiple second pressure grooves 214 arranged to divide the first pressure groove 213, and the first pressure groove 213 and the multiple second pressure grooves 214 are arranged intersectingly. The inner ring side of the first pressure groove 213 forms the opening portion 212, and the intersection of the multiple second pressure grooves 214 converges within the first pressure groove 213 to form the crack-prone area. Both the first pressure groove 213 and the second pressure grooves 214 are grooves, formed by local thinning. Moreover, the intersection of the multiple second pressure grooves 214 is the weakest point of the sealing head, thus forming the position where the opening portion 212 opens first, facilitating pressure relief.

[0042] More preferably, such as Figure 2 As shown, the first pressure groove 213 is annular, and two second pressure grooves 214 are provided, arranged in a cross shape. Preferably, the center of the cross coincides with the center of the annular first pressure groove 213. The thickness of the two second pressure grooves 214 at their intersection is less than the thickness of the other parts of the second pressure grooves 214. Furthermore, because the thickness of the sealing pin 21 gradually decreases from the edge to the center, and combined with the cross-shaped and annular scoring, when the battery fails and releases pressure, the weakest point in the center of the sealing pin 21 opens first. Moreover, the fan-shaped fragments formed by the broken opening 212 are not splashed due to the connection restriction of the sealing body 211, thus better improving the safety of the sodium battery.

[0043] Furthermore, the sealing performance at the first through hole 11 has also been improved. Specifically, in conjunction with Figure 3 and Figure 4 As shown, a first protrusion 12 protrudes from the first side of the cover body 1, and the first protrusion 12 is circumferentially disposed around the outer periphery of the first through hole 11. A groove 13 is provided on the surface of the first protrusion 12 facing away from the first side. The battery cover plate 100 also includes a sealing member 3, which is disposed in the groove 13, and the sealing hole structure 2 is pressed onto the sealing member 3. The groove 13 restricts the sealing member 3, and then the sealing pin 21 is pressed onto the end of the sealing member 3 facing away from the first side of the cover body 1. The sealing member 3 can seal the space between the sealing pin 21 and the first through hole 11, reducing the risk of battery leakage and improving battery safety performance.

[0044] Preferably, in the direction protruding from the first side of the cover body 1, the protrusion height of the sealing member 3 is higher than the protrusion height h of the first protrusion 12, wherein h is 0.1mm to 0.3mm. This provides the sealing member 3 with a certain amount of compression space to ensure a better sealing effect.

[0045] The sealing nail 21 may also include a handle on the outside of the sealing head, allowing for easy installation by gripping the handle. Both the sealing nail 21 and the cover body 1 can be made of aluminum and manufactured using a stamping process, resulting in high production efficiency and low cost. The stamped sealing nail 21 incorporates an explosion-proof valve function, eliminating the need for separate welding of the explosion-proof valve to the cover body 1, thus improving the production efficiency of the battery cover 100 and reducing costs.

[0046] Furthermore, the sealing structure 2 is coaxially arranged with both the first through hole 11 and the first protrusion 12, and the outer periphery of the sealing structure 2 is welded to the outer periphery of the first protrusion 12. Specifically, the outer periphery of the sealing nail 21 and the outer periphery of the first protrusion 12 are laser-welded to achieve a secondary seal at the second through hole, ensuring the sealing effect of the sodium battery.

[0047] This utility model also provides a sodium battery, including the aforementioned battery cover 100. The battery cover 100 enables the sodium battery to have a higher liquid injection efficiency, fewer parts, and simpler and more convenient manufacturing. Moreover, by reducing the number of openings on the battery cover 100, the battery cover 100 becomes stronger, while the opening of the first through hole 11 can be larger, allowing for faster pressure release and effectively reducing the risk of sodium battery explosion. This makes the sodium battery less prone to leakage and safer.

[0048] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structure made using the contents of the present utility model specification and drawings, or directly or indirectly applied to other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A battery cover plate, characterized by, The battery cover plate comprises: a cover body having a first through hole formed therein; a hole sealing structure arranged at the first through hole and having a breakable area formed thereon; wherein the breakable area has a closed state in which the first through hole is closed, and a pressure relief state in which at least part of the breakable area is broken to open the first through hole under the pressure of the battery.

2. The battery cover plate of claim 1, wherein, The hole sealing structure is a sealing pin having a sealing head arranged at the first through hole, and the breakable area is arranged on the sealing head.

3. The battery cover plate of claim 2, wherein, The sealing head comprises a sealing body and an opening part arranged at the middle of the sealing body, and the breakable area is arranged on the opening part. In the pressure relief state, at least part of the opening part is broken, and at least part of the opening part is connected to the sealing body.

4. The battery cover plate of claim 2, wherein, In a direction from the center of the sealing head to the edge, the thickness of the sealing head gradually increases.

5. The battery cover plate of claim 1, wherein, The hole sealing structure comprises a sealing body arranged at the first through hole and an opening part arranged on the sealing body and corresponding to the central area of the first through hole. The sealing body is provided with a first pressure groove arranged in a ring shape and a plurality of second pressure grooves arranged to divide the first pressure groove, and the first pressure groove and the plurality of second pressure grooves are arranged in a cross shape. The inner ring side of the first pressure groove forms the opening part, and the intersection points of the plurality of second pressure grooves converge in the first pressure groove to form the breakable area.

6. The battery cover plate of claim 5, wherein, The second pressure groove is provided with two second pressure grooves arranged in a "cross" shape, wherein the thickness of the intersection of the two second pressure grooves is less than the thickness of the rest of the second pressure groove.

7. The battery cover plate of claim 1, wherein, The first side of the cover body is provided with a first protruding part arranged around the outer periphery of the first through hole, and the surface of the first protruding part away from the first side is provided with a groove. The battery cover plate further comprises a sealing member arranged in the groove, and the hole sealing structure is crimped on the sealing member.

8. The battery cover plate of claim 7, wherein, In a direction protruding from the first side of the cover body, the protruding height of the sealing member is higher than the protruding height h of the first protruding part, wherein h is 0.1mm-0.3mm.

9. The battery cover plate of claim 7, wherein, The hole sealing structure, the first through hole and the first protruding part are coaxially arranged, and the outer periphery of the hole sealing structure and the outer periphery of the first protruding part are welded.

10. A sodium battery, characterized by, The battery cover plate comprises the battery cover plate according to any one of claims 1 to 9.

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