Box cover, battery box and battery pack

Abstract

The utility model provides a box cover, a battery box and a battery pack, and relates to the field of lithium batteries. The box cover comprises a cover plate, an anti-explosion valve and a blocking assembly. Wherein the box cover is provided with at least one mounting hole, and the anti-explosion valves are matched with the mounting holes in a one-to-one correspondence mode. On the basis, the blocking assembly is connected with the cover plate and used for separating the anti-explosion valve and the battery cell assembly so as to block impact and inflammables generated by the battery cell assembly under the condition of thermal runaway. On the basis of the arrangement of the blocking assembly, on one hand, physical isolation can be realized, namely, the anti-explosion valve and the battery cell assembly are separated through the blocking assembly, so that the anti-explosion valve can be effectively prevented from being directly impacted by high temperature, flame and deflagration generated by the battery cell assembly during thermal runaway; on the other hand, the ignition risk can be reduced, that is, the blocking assembly can prevent flammable substances generated during thermal runaway of the battery cell assembly from making contact with the anti-explosion valve, and the risk that the internal structure of the anti-explosion valve is ignited is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, specifically, relate to a box cover, battery box and battery package. BACKGROUND

[0002] The explosion-proof valve is widely used in lithium ion batteries as an important safety device. Its main function is to release pressure in time when the internal pressure of the battery abnormally rises, preventing serious accidents such as explosion of the battery pack. The design principle of the explosion-proof valve is usually to achieve gas discharge through deformation or rupture of the mechanical structure when the preset pressure threshold is reached.

[0003] However, in actual application, when the cell assembly in the battery pack experiences thermal runaway, multiple deflagrations will be triggered, producing huge flames. These flames and flammable materials in the flames will ignite the internal structure of the explosion-proof valve, causing the burning material inside the explosion-proof valve to continuously produce flames, further threatening the safety of the battery pack and even the electrical device. SUMMARY

[0004] The utility model aims to provide a box cover, battery box and battery package, the box cover is separated explosion-proof valve and cell assembly through blocking component, so that in the case of thermal runaway of cell assembly, effectively isolate the impact and flammable material brought by deflagration, avoid the internal structure of explosion-proof valve being ignited, reduce the use risk.

[0005] The embodiments of the utility model can be implemented as follows:

[0006] In a first aspect, the utility model provides a box cover, comprising:

[0007] A cover plate, the box cover is provided with at least one mounting hole;

[0008] An explosion-proof valve, the explosion-proof valve is matched with the mounting hole one by one;

[0009] A blocking component, the blocking component is connected with the cover plate and is used for separating the explosion-proof valve and the cell assembly to block the impact and flammable material generated by the cell assembly in the case of thermal runaway.

[0010] In an optional embodiment, the blocking component comprises a first connecting piece, a blocking piece and a second connecting piece; wherein the blocking piece is arranged opposite to the cover plate and is used for separating the explosion-proof valve and the cell assembly, the first connecting piece and the second connecting piece are respectively arranged at both ends of the blocking piece and are connected with the cover plate.

[0011] In an optional embodiment, the blocking piece comprises a first plate part, a second plate part and a third plate part; wherein the first plate part is connected with the first connecting piece, the third plate part is connected with the second connecting piece, the first plate part, the second plate part and the third plate part are connected in sequence at an included angle and jointly form a U-shaped structure.

[0012] In an optional embodiment, the blocking assembly is provided with a ventilation opening for allowing the flow of high-temperature gas around the explosion-proof valve after the blocking assembly blocks the impact and the flammable material.

[0013] In an optional embodiment, the ventilation area of the ventilation opening is greater than the sum of the maximum exhaust areas of all the explosion-proof valves.

[0014] In an optional embodiment, the cover plate is provided with at least two mounting holes along the length direction, and the explosion-proof valves are correspondingly matched with the mounting holes.

[0015] In an optional embodiment, the cover plate and the blocking assembly are both made of hot-dip galvanized steel plates.

[0016] In an optional embodiment, the cover plate and the blocking assembly are welded.

[0017] In a second aspect, the utility model provides a battery box, including box body and like preceding embodiment any one of box body, and the cooperation of box cover and the open end of box body.

[0018] In a third aspect, the utility model provides a battery pack, including electric core assembly and like preceding embodiment battery box, and electric core assembly is located in the box body.

[0019] The beneficial effects of the box cover, the battery box and the battery pack provided in the embodiments of the utility model include:

[0020] The utility model provides a box cover, battery box and battery pack, the box cover includes cover plate, explosion -proof valve and blocking assembly. Wherein, the box cover is provided with at least one mounting hole, and the explosion -proof valve is correspondingly matched with the mounting hole. On this basis, the blocking assembly is connected with the cover plate, and is used for separating the explosion -proof valve and the electric core assembly to block the impact and the flammable material generated under the condition of thermal runaway of electric core assembly. Based on the setting of the blocking assembly, on the one hand, physical isolation can be realized, that is, the explosion -proof valve is separated from the electric core assembly by the blocking assembly, and the high temperature, flame and deflagration generated by the electric core assembly when thermal runaway can be effectively prevented from directly impacting the explosion -proof valve. On the other hand, the risk of ignition can be reduced, that is, the blocking assembly can prevent the flammable material generated by the electric core assembly when thermal runaway from contacting the explosion -proof valve, and reduce the risk of ignition of the internal structure of the explosion -proof valve. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope. For ordinary skilled person in the art, other related drawings can also be obtained according to these drawings without creating creative labor.

[0022] Figure 1 A structure schematic view of a box cover and a box body provided for the embodiment is shown in the figure;

[0023] Figure 2 Another structure schematic view of a box cover and a box body provided for the embodiment is shown in the figure;

[0024] Figure 3 A structure schematic view of a battery box provided for the embodiment is shown in the figure. Figure 2 An enlarged schematic view of A in the figure;

[0025] Figure 4 A structure schematic view of a battery box provided for the embodiment is shown in the figure. Figure 3 A sectional schematic view of B-B in the figure;

[0026] Figure 5 A structure schematic view of a battery box provided for the embodiment is shown in the figure.

[0027] Figure legend: 10-battery box; 100-box cover; 110-blocking assembly; 111-first connecting piece; 113-blocking piece; 1131-first plate part; 1133-second plate part; 1135-third plate part; 115-second connecting piece; 130-cover plate; 131-mounting hole; 150-explosion-proof valve; 300-box body. DETAILED DESCRIPTION

[0028] In the related art, when the thermal runaway phenomenon occurs in the battery cell assembly in the battery pack, the internal structure of the explosion-proof valve is easily ignited, causing the burning material inside the explosion-proof valve to continuously produce sparks, thereby further threatening the safety of the battery pack.

[0029] To solve the above problems, the utility model provides a box cover 100, a battery box 10 and a battery pack, the box cover 100 is separated explosion-proof valve 150 and battery cell assembly through blocking assembly 110, so that in the case of thermal runaway of battery cell assembly, the impact and inflammable material caused by deflagration are effectively isolated, the internal structure of explosion-proof valve 150 is avoided to be ignited, and the use risk is reduced.

[0030] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the utility model.

[0032] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the utility model, it should be pointed out that if the terms such as 'up', 'down', 'inner', 'outer' indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the utility model product in common use, it is only for the convenience of describing the utility model and simplifying the description, and it does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0034] In addition, if the terms 'first','second' and the like appear, they are only used for differentiation description, and cannot be understood as indicating or implying relative importance.

[0035] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0036] The overall structure, working principle and technical effects of the box cover 100, the battery box 10 and the battery pack provided by the utility model are described in detail below through embodiments and in combination with the drawings.

[0037] Figure 1 The structural schematic view of the box cover 100 and the box body 300 provided for the embodiment, Figure 2 Another structural schematic view of the box cover 100 and the box body 300 provided for the embodiment, Figure 3 The structural schematic view of the box cover 100 provided for the embodiment, Figure 2 The enlarged schematic view of A in the above figure, please refer to Figures 1 to 3 The utility model provides a kind of box cover 100, applied to battery box 10, including cover plate 130, explosion-proof valve 150 and blocking component 110.Wherein, box cover 100 is provided with at least one mounting hole 131, explosion-proof valve 150 is matched with mounting hole 131 one by one.Based on this, blocking component 110 is connected with cover plate 130, and it is used to separate explosion-proof valve 150 and battery cell component, to block the impact and inflammable material generated by battery cell component in the case of thermal runaway.

[0038] Based on the arrangement of the blocking assembly 110, on the one hand, physical isolation can be achieved, that is, the explosion-proof valve 150 is separated from the battery cell assembly by the blocking assembly 110, which can effectively prevent the high temperature, flame and deflagration generated by the battery cell assembly in thermal runaway from directly impacting the explosion-proof valve 150; on the other hand, the risk of ignition can be reduced, that is, the blocking assembly 110 can prevent the flammable substances generated by the battery cell assembly in thermal runaway from contacting the explosion-proof valve 150, thereby reducing the risk of ignition of the internal structure of the explosion-proof valve 150.

[0039] In some embodiments, the cover plate 130 and the blocking assembly 110 are both made of hot-dip galvanized steel plate (SGCC). It should be noted that since the hot-dip galvanized steel plate has excellent rust resistance, the service life of the cover plate 130 and the blocking assembly 110 is significantly prolonged, and the frequency of maintenance and replacement due to corrosion is reduced. In addition, since welding is a high-strength connection method, the cover plate 130 and the blocking assembly 110 are welded, thereby ensuring firm connection between the cover plate 130 and the blocking assembly 110 and preventing loosening or falling off during use. Alternatively, the welding method is resistance welding.

[0040] To further improve the safety in use, the cover plate 130 is provided with at least two mounting holes 131 along the length direction, and the explosion-proof valve 150 is correspondingly matched with the mounting hole 131. That is to say, the box cover 100 in the embodiment of the present application can be provided with a plurality of explosion-proof valves 150 to provide sufficient passages for quickly releasing the generated gas and avoiding gas accumulation to prevent battery explosion.

[0041] Alternatively, all the mounting holes 131 are arranged at equal intervals along the length direction of the cover plate 130 to ensure that when an explosion occurs, each explosion-proof valve 150 can uniformly disperse the explosion pressure and reduce damage to the surrounding structure, thereby improving the overall safety. In the present application, as shown in Figure 3 , the number of mounting holes 131 and explosion-proof valves 150 is three.

[0042] Please refer to Figure 4 , the arrow in Figure 4 indicates the flow direction of high-temperature gas, and the blocking assembly 110 is provided with a ventilation opening for allowing the high-temperature gas flowing around to flow to the explosion-proof valve 150 after the blocking assembly 110 blocks the impact and flammable substances. It can be easily understood that the ventilation opening provides a gas discharge path, so that after being blocked by the blocking assembly 110, the high-temperature gas can flow around and flow to the explosion-proof valve 150 through the ventilation opening, reducing the accumulation of gas in the battery box 10, thereby reducing the risk of explosion and fire. Alternatively, the upper part or the lower part of the blocking assembly 110 is provided with the ventilation opening, thereby ensuring normal gas discharge and blocking the impact and flammable substances.

[0043] And, according to the air flow principle that the smaller the cross-sectional area, the greater the gas flow rate, the ventilation area of the ventilation opening is greater than the sum of the maximum exhaust areas of all the explosion-proof valves 150. Based on this, when the high-temperature gas flows from the ventilation opening to the explosion-proof valve 150 with a smaller exhaust area, the flow rate becomes faster, and the high-temperature gas is quickly discharged in a short time, achieving the beneficial effect of improving the response speed of the system.

[0044] Exemplarily, in the case where the number of explosion-proof valves 150 is three, and the maximum exhaust area of any one of the explosion-proof valves 150 is 1300mm 2 , the total exhaust area of all the explosion-proof valves 150 is 3900mm 2 . At this time, the opening area of the ventilation opening arranged at the lower part of the blocking assembly 110 is 5600mm 2 , so that the ventilation area of the ventilation opening is greater than the total exhaust area of all the explosion-proof valves 150, so that the flow rate of the high-temperature gas flowing from the ventilation opening to the explosion-proof valve 150 increases and is quickly discharged.

[0045] Please refer again to Figure 3 , the blocking assembly 110 includes a first connecting piece 111, a blocking piece 113, and a second connecting piece 115. Among them, the blocking piece 113 is arranged opposite to the cover plate 130, and is used to separate the explosion-proof valve 150 and the battery cell assembly, so as to achieve the beneficial effect of preventing the impact and flammable materials generated by the battery cell assembly in thermal runaway. The first connecting piece 111 and the second connecting piece 115 are arranged at both ends of the blocking piece 113 respectively, and are connected with the cover plate 130, so as to ensure that the blocking piece 113 will not loosen or fall off during use. Optionally, the first connecting piece 111 and the second connecting piece 115 are connected with the cover plate 130 by resistance welding.

[0046] Further, the blocking piece 113 includes a first plate part 1131, a second plate part 1133, and a third plate part 1135. Among them, the first plate part 1131 is connected with the first connecting piece 111, and the third plate part 1135 is connected with the second connecting piece 115. And the first plate part 1131, the second plate part 1133, and the third plate part 1135 are connected in sequence at an angle, and jointly form a U-shaped structure. It is easy to understand that the U-shaped structure and the cover plate 130 jointly form an isolation chamber with the ventilation opening at the upper and lower sides, so as to help normal discharge of high-temperature gas, and also help to block the impact and flammable materials. Optionally, the first plate part 1131 and the third plate part 1135 can also be provided with corresponding ventilation openings, and the second plate part 1133 can always block the impact.

[0047] In summary, the utility model provides a kind of box cover 100, including cover plate 130, explosion-proof valve 150 and blocking component 110.Wherein, box cover 100 is provided with at least one mounting hole 131, and explosion-proof valve 150 is matched with mounting hole 131 one by one.Based on this, blocking component 110 is connected with cover plate 130, and is used to separate explosion-proof valve 150 and battery cell assembly, to block the impact and combustible material generated in the case of thermal runaway of battery cell assembly.Based on the setting of blocking component 110, on the one hand, physical isolation can be realized, i.e.

[0048] In addition, as shown in the utility model also provides a kind of battery box 10, it includes box body 300 and the box cover 100 in the aforementioned embodiment, and, the opening end of box cover 100 is matched with box body 300.Therefore, the battery box 10 can also achieve the beneficial effects of effectively preventing the high temperature, flame and deflagration generated by battery cell assembly in the case of thermal runaway from directly impacting explosion-proof valve 150, preventing the combustible material generated by battery cell assembly in the case of thermal runaway from contacting explosion-proof valve 150, and reducing the risk of ignition of the internal structure of explosion-proof valve 150. Figure 5

[0049] In addition, the utility model also provides a kind of battery pack, especially provides a kind of severe thermal runaway ternary battery pack, it includes battery cell assembly and the battery pack in the aforementioned embodiment, and battery cell assembly is located in box body 300.Therefore, the battery pack can also achieve the beneficial effects of effectively preventing the high temperature, flame and deflagration generated by battery cell assembly in the case of thermal runaway from directly impacting explosion-proof valve 150, preventing the combustible material generated by battery cell assembly in the case of thermal runaway from contacting explosion-proof valve 150, and reducing the risk of ignition of the internal structure of explosion-proof valve 150.

[0050] The above is only the specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model.​

Claims

1. A box lid, characterized in that, include: The cover plate (130) has at least one mounting hole (131) in the box cover (100); An explosion-proof valve (150) is provided, and the explosion-proof valve (150) is matched with the mounting hole (131) in a one-to-one correspondence. A blocking assembly (110) is connected to the cover plate (130) and is used to separate the explosion-proof valve (150) from the battery cell assembly to block the impact and flammable materials generated by the battery cell assembly in the event of thermal runaway.

2. The box lid according to claim 1, characterized in that, The blocking assembly (110) includes a first connector (111), a blocking member (113), and a second connector (115); wherein the blocking member (113) is disposed opposite to the cover plate (130) and is used to separate the explosion-proof valve (150) from the battery cell assembly, and the first connector (111) and the second connector (115) are respectively disposed at both ends of the blocking member (113) and are both connected to the cover plate (130).

3. The lid according to claim 2, characterized in that, The blocking member (113) includes a first plate portion (1131), a second plate portion (1133), and a third plate portion (1135); wherein the first plate portion (1131) is connected to the first connecting member (111), the third plate portion (1135) is connected to the second connecting member (115), and the first plate portion (1131), the second plate portion (1133), and the third plate portion (1135) are connected at an angle in sequence and together form a U-shaped structure.

4. The box lid according to claim 1, characterized in that, The blocking assembly (110) is provided with a vent, which is used to allow the high-temperature gas flowing around it to the explosion-proof valve (150) after the blocking assembly (110) blocks the impact and flammable materials.

5. The box lid according to claim 4, characterized in that, The ventilation area of ​​the vent is greater than the sum of the maximum exhaust areas of all the explosion-proof valves (150).

6. The lid according to any one of claims 1 to 5, characterized in that, The cover plate (130) has at least two mounting holes (131) along its length, and the explosion-proof valve (150) is matched with the mounting holes (131) one by one.

7. The lid according to any one of claims 1 to 5, characterized in that, Both the cover plate (130) and the blocking assembly (110) are made of hot-dip galvanized steel sheet.

8. The lid according to any one of claims 1 to 5, characterized in that, The cover plate (130) is welded to the blocking assembly (110).

9. A battery box, characterized in that, Includes a housing (300) and a housing (300) as described in any one of claims 1 to 8, wherein the lid (100) engages with the open end of the housing (300).

10. A battery pack, characterized in that, It includes a cell assembly and a battery case (10) as described in claim 9, wherein the cell assembly is located within the case (300).

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