Anti-explosion shell of battery and battery

Abstract

The utility model discloses an explosion-proof shell of a battery and the battery. A shell assembly of the battery comprises a shell, a flow guide cover plate and an explosion-proof unit, explosion-proof holes are respectively formed in two sides of the shell; the flow guide cover plate is located on the side, provided with the anti-explosion hole, of the shell, and a flow guide cavity is formed between the flow guide cover plate and the shell. The anti-explosion unit comprises a connecting ring and an anti-explosion piece, the connecting ring is detachably and fixedly connected to the anti-explosion hole, and the anti-explosion piece is fixedly connected into the connecting ring; the anti-explosion piece is of an arc-shaped piece-shaped structure and comprises a convex face and a concave face, and the convex face is located on the side away from the interior of the shell. A plurality of crossed anti-explosion nicks are etched on the convex surface, and anti-explosion point positions are arranged at the intersection points of the anti-explosion nicks; according to the utility model, the problem that secondary safety risk is brought to a circuit on one side of the battery terminal when the battery is in thermal runaway due to the fact that the explosion-proof valve and the battery terminal are positioned in the same direction in the explosion-proof process of the existing battery shell is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, and particularly relates to an explosion-proof housing and a battery for a battery. Background Art

[0002] Lithium-ion batteries are currently the best battery systems in terms of comprehensive performance, with characteristics such as high specific energy, long cycle life, small volume, light weight, no memory effect, and no pollution. They have rapidly developed into a new generation of energy storage power sources and are widely used in fields such as information technology, electric vehicles and hybrid vehicles, and aerospace. Among them, square batteries, as one of the three packaging (square, soft pack, cylindrical) forms of power batteries, have a series of advantages such as high packaging reliability, high system energy efficiency, relatively simple structure, large single-cell capacity, relatively simple system composition, and low cost.

[0003] At present, in the process of explosion-proof treatment of batteries, the current conventional solution is to integrate the pole column, the liquid injection hole, and the explosion-proof valve onto the top cover sheet. The advantage of this solution is that it has a traditional and mature process route, making the manufacturing process simple and the yield high. However, this solution has certain drawbacks. Since the battery terminals and the explosion-proof valve are in one direction, once the battery undergoes thermal runaway, a large amount of high-temperature gas ejected from the explosion-proof valve directly acts on the external electrical circuit, posing a risk of secondary safety problems. Based on this, the present application proposes an explosion-proof housing and a battery for a battery according to the above deficiencies. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: how to improve the problem that when the existing battery undergoes thermal runaway, it will bring secondary safety risks to the circuit on the side of the battery terminals.

[0005] To solve the above technical problems, the utility model provides the following technical solutions:

[0006] An explosion-proof housing for a battery, comprising:

[0007] A housing, with explosion-proof holes respectively opened on both sides thereof;

[0008] A diversion cover plate, fixedly connected to the housing and located on the side of the housing where the explosion-proof holes are opened, and a diversion cavity is provided between the diversion cover plate and the housing;

[0009] An explosion-proof unit, which includes a connecting ring installed in the explosion-proof hole and an explosion-proof sheet installed inside the connecting ring.

[0010] In this application, explosion-proof units are provided on both sides of the housing, so that the heat flow is discharged through both sides of the housing. An explosion-proof sheet is provided on the explosion-proof unit, and at the same time, diversion covers are provided on both sides of the housing. A diversion cavity is opened in the diversion cover, which can effectively adjust the direction of the heat flow. Therefore, through the explosion-proof unit, when the battery in the housing undergoes thermal runaway, a large amount of high-temperature gas generated breaks through the explosion-proof sheet and flows out from the diversion cavity, so as to release the pressure inside the battery, and can effectively improve the problem that in the explosion-proof process of the existing battery housing, the explosion-proof valve and the battery terminal are in the same direction, so as to avoid the secondary safety risk to the circuit on the side of the battery terminal when the battery undergoes thermal runaway.

[0011] As a further solution of the present utility model: the explosion-proof sheet is an arc-shaped sheet structure, which includes a convex surface and a concave surface, and the convex surface is located on the side away from the inside of the housing; a plurality of intersecting explosion-proof grooves are etched on the convex surface, and explosion-proof points are provided at the intersection points of the explosion-proof grooves.

[0012] When the battery in the housing undergoes thermal runaway, a large amount of high-temperature gas generated breaks through the explosion-proof sheet from the concave surface, so as to release the pressure inside the battery.

[0013] As a further solution of the present utility model: the shape of the explosion-proof sheet is centrosymmetric, and the explosion-proof points are located at its symmetric center.

[0014] For the explosion-proof sheet, the strength at the position of the explosion-proof points is the lowest; by setting the explosion-proof points, it is convenient for the explosion-proof sheet to be opened in time. Therefore, setting the explosion-proof points at the symmetric center position can improve the explosion-proof effect of the explosion-proof sheet.

[0015] As a further solution of the present utility model: a first cover plate and a second cover plate are fixedly connected to the housing, the first cover plate and the second cover plate are respectively located at both ends of the housing, and two pole bodies are provided on the first cover plate.

[0016] The first cover plate and the second cover plate are used to fix both sides of the housing, that is, to fix the battery cells inside the housing; the pole bodies on the second cover plate are used for electrical connection to the battery cells.

[0017] As a further solution of the present utility model: one end of the diversion cavity is a closed end, and the other end is an open end; the open end is located at the end of the housing away from the pole body.

[0018] In this application, by setting the open end at the end away from the pole body, when the battery is abnormal, the heat flow generated in the explosion-proof hole is discharged through the end away from the pole body of the battery, so as to prevent the heat from damaging the pole body.

[0019] As a further solution of the present utility model: A plurality of inclined flow guiding plates are arranged on the flow guiding cover plate. One end of the flow guiding plate is connected to the edge of the flow guiding cover plate, and the other end is located in the middle area of the flow guiding cover plate; wherein the end of the flow guiding plate points to the opening end of the flow guiding cavity.

[0020] In this application, by arranging the flow guiding plate and the end of the flow guiding plate pointing to the opening end of the flow guiding cavity, the gas flow in the flow guiding cavity is guided by the flow guiding plate; the flow guiding effect in the flow guiding cavity can be improved, and the flow direction of the gas can be guided.

[0021] As a further solution of the present utility model: An extension part is arranged on the periphery of the connecting ring, and the extension part is clamped on the inner side wall of the shell.

[0022] The arrangement of the extension part in this application ensures the complete connection between the connecting ring and the shell, and ensures the stability of their connection.

[0023] As a further solution of the present utility model: A plurality of clamping parts for clamping the shell are further arranged on the outer edge of the connecting ring.

[0024] The arrangement of the clamping parts in this application can further ensure the firmness of the connection between the connecting ring and the shell on the basis of the connection of the extension part.

[0025] As a further solution of the present utility model: A plurality of limiting protrusions are arranged on the inner side wall of the shell.

[0026] In this application, by arranging a plurality of limiting protrusions on the inner side wall of the shell, the side wall of the battery cell located in the shell is connected to the limiting protrusions to play a role in limiting the battery cell.

[0027] The present utility model also discloses a battery, which is characterized in that it includes the explosion-proof shell of the above-mentioned battery and a battery cell. The battery cell is located inside the shell, and a gap area is reserved between the side wall of the battery cell and the inner side wall of the shell.

[0028] The reserved gap area in this application can enable a large amount of high-temperature gas generated when the battery in the shell undergoes thermal runaway to pass through the gap area and then be discharged by the explosion-proof unit, playing an intermediate transmission role. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the flow guiding cover plate on the hidden side of the battery in the embodiment of the present utility model;

[0030] Figure 2 It is a schematic structural diagram of the flow guiding cover plate on the hidden side of the battery in the embodiment of the present utility model from another axonometric view;

[0031] Figure 3 It is a schematic structural diagram of the battery shell in the embodiment of the present utility model;

[0032] Figure 4 This is a schematic structural diagram of another perspective of the battery housing according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic structural diagram of the battery housing after hiding the top according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic structural diagram of the explosion-proof unit according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic top view structural diagram of the explosion-proof unit according to an embodiment of the present invention;

[0036] Figure 8 is Figure 7 The schematic structural diagram of the A-A cross-section in

[0037] Explanation of reference numerals:

[0038] 100, housing; 101, explosion-proof hole; 102, limit projection; 110, first cover plate; 111, pole body; 120, second cover plate;

[0039] 200, diversion cover plate; 201, diversion cavity; 210, diversion plate;

[0040] 300, explosion-proof unit; 310, connecting ring; 311, extension part; 312, clamping part; 320, explosion-proof sheet; 3201, convex surface; 3202, concave surface; 3203, explosion-proof notch; 3204, explosion-proof point position;

[0041] 400, battery cell; 410, gap area. Detailed implementation manners

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Please refer to Figures 1 to 8, It should be noted that the structures, ratios, sizes, etc. shown in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy and purpose that the present utility model can achieve, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0044] Referring to Figure 1 , this application can be used to improve the problem that in the explosion-proof process of the existing battery housing 100, the explosion-proof valve and the battery terminal are in the same direction, so that when the battery is in thermal runaway, it will bring a secondary safety risk to the circuit on the battery terminal side.

[0045] Specifically, an explosion-proof housing and a battery of a battery include a housing 100, a diversion cover plate 200, an explosion-proof unit 300, and an electric core 400. The electric core 400 is installed inside the housing 100. Among them, multiple explosion-proof units 300 can be provided, and the explosion-proof units 300 are located on both side walls of the housing 100, and the diversion cover plate 200 is installed on both sides of the housing 100 and can cover the explosion-proof units 300. By providing the explosion-proof unit 300, a large amount of high-temperature gas generated when the battery in the housing 100 is in thermal runaway is ejected from the explosion-proof units 300 on both sides of the housing 100 and then flows out from the diversion cover plate 200.

[0046] Referring to Figure 1 、 Figure 2 and Figure 3 , explosion-proof holes 101 are respectively opened on both sides of the housing 100, and the explosion-proof units 300 are installed in the explosion-proof holes 101. The number of the explosion-proof holes 101 is the same as the number of the explosion-proof units 300, which is determined according to the actual situation and is not limited in this application.

[0047] Furthermore, a first cover plate 110 and a second cover plate 120 are fixedly connected to the housing 100, and the first cover plate 110 and the second cover plate 120 are respectively located at both ends of the housing 100. Specifically, two pole bodies 111 are provided on the first cover plate 110, and the pole bodies 111 are used for electrically connecting to the electric core 400 of the battery.

[0048] In an embodiment, in order to improve the actual use effect of this device, a plurality of limiting protrusions 102 can be provided on the inner side wall of the housing 100. The number of the limiting protrusions 102 is not limited in this application and is determined according to the actual situation. The bottom wall of the electric core 400 located inside the housing 100 is connected to the limiting protrusions 102.

[0049] Referring to Figure 3 and Figure 5, The diversion cover plate 200 is installed on both sides of the housing 100, that is, on the side of the housing 100 where the explosion-proof hole 101 is provided. A diversion cavity 201 is provided between the diversion cover plate 200 and the housing 100. Therefore, when the battery is abnormal, the heat flow generated in the explosion-proof hole 101 can be discharged through the diversion cavity 201. Specifically, in order to provide the actual use effect of the diversion cover plate 200, one end of the diversion cavity 201 is a closed end in a closed state, and the other end is an open end in an open state. The heat flow generated by the battery is discharged through the open end.

[0050] It should be noted that the open end of the diversion cavity 201 is located at the end of the housing 100 away from the pole body 111. Therefore, when the battery is abnormal, the heat flow generated in the explosion-proof hole 101 is discharged through the end away from the pole body 111 of the battery.

[0051] In an embodiment, a plurality of inclined diversion plates 210 are provided on the diversion cover plate 200. The diversion plates 210 are in a group up and down, and there are several groups. The specific quantity and spacing are determined according to the actual situation, and this application does not make a limitation. One end of the diversion plate 210 is connected to the edge of the diversion cover plate 200, and the other end is located in the middle area of the diversion cover plate 200. The diversion plate 210 points to the open end of the diversion cavity 201 to guide the gas flow in the diversion cavity 201 through the diversion plate 210, which can improve the diversion effect in the diversion cavity 201 and guide the flow direction of the gas.

[0052] Refer to Figure 6 、 Figure 7 and Figure 8 , The explosion-proof unit 300 may include a connection ring 310 and an explosion-proof sheet 320, and the explosion-proof sheet 320 is connected to the inner ring position of the connection ring 310. An extension portion 311 is provided outside the connection ring 310, and the extension area of the extension portion 311 is larger than the area of the explosion-proof hole 101, and the outer edge of the connection ring 310 has the same size and area as the explosion-proof hole 101. Therefore, during the installation of the explosion-proof unit 300, the extension portion 311 can be clamped on the inner side wall of the housing 100, and the connection ring 310 passes through the explosion-proof hole 101. At the same time, a plurality of clamping portions 312 are provided on the connection ring 310, and the clamping portions 312 are clamped on the outer side wall of the housing 100. Therefore, through the extension portion 311 and the clamping portions 312, the connection ring can be detachably and fixedly connected to the housing 100.

[0053] It can be understood that an inner ring area is provided in the connection ring 310, and the explosion-proof sheet 320 is connected to the inner ring area.

[0054] Further, the explosion-proof sheet 320 is an arc-shaped sheet structure, which includes a convex surface 3201 and a concave surface 3202. Among them, the convex surface 3201 is on the side away from the inside of the housing 100. Therefore, when a large amount of high-temperature gas generated by the thermal runaway of the battery in the housing 100 breaks through the explosion-proof sheet 320 from the concave surface 3202, the pressure inside the battery can be released.

[0055] Referring to Figure 6 , Figure 7 and Figure 8 , in an embodiment, a plurality of intersecting explosion-proof grooves 3203 are etched on the convex surface 3201, and an explosion-proof point 3204 is arranged at the intersection of the explosion-proof grooves 3203. It can be understood that for the explosion-proof sheet 320, the strength at the position of the explosion-proof point 3204 is the lowest. By setting the explosion-proof point 3204, it is convenient for the explosion-proof sheet 320 to open in time.

[0056] Further, in order to improve the explosion-proof effect of the explosion-proof sheet 320, the shape of the explosion-proof sheet 320 is centrosymmetric, and the explosion-proof point 3204 is located at its center of symmetry.

[0057] Referring to Figure 1 , a gap region 410 is included between the side wall of the battery cell 400 and the inner side wall of the housing 100. When a large amount of high-temperature gas generated by the thermal runaway of the battery in the housing 100 passes through the gap region 410, it can be discharged by the explosion-proof unit 300.

[0058] The specific operation principle of the present application is as follows:

[0059] By arranging the explosion-proof units 300 on both sides of the housing 100, the heat flow is discharged through both sides of the housing 100; at the same time, the diversion cover plates 200 located on both sides of the housing 100 and the diversion cavity 201 inside the diversion cover plates 200 can effectively adjust the direction of the heat flow. And through the explosion-proof unit 300 on the explosion-proof hole 101, when a large amount of high-temperature gas generated by the thermal runaway of the battery in the housing 100 breaks through the explosion-proof sheet 320 from the concave surface 3202 and enters the diversion cavity 201, and through the diversion treatment of the diversion plate 210 inside the diversion cavity 201, the heat can be discharged from the open end of the diversion cavity 201 to release the pressure inside the battery.

[0060] Therefore, it can effectively improve the problem that in the explosion-proof process of the existing battery housing 100, the explosion-proof valve and the battery terminal are in the same direction, so that when the battery is in thermal runaway, it will bring a secondary safety risk to the circuit on the battery terminal side. Therefore, the utility model effectively overcomes some practical problems in the prior art and thus has high utilization value and practical significance.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An explosion-proof housing for a battery, characterized in that: include: The shell (100) has explosion-proof holes (101) on both sides thereof; A flow guide cover plate (200) is fixedly connected to the shell (100) and is located on a side of the shell (100) where the explosion-proof hole (101) is opened, wherein a flow guide cavity (201) is provided between the flow guide cover plate (200) and the shell (100); The explosion-proof unit (300) comprises a connecting ring (310) installed in an explosion-proof hole (101), and an explosion-proof plate (320) installed inside the connecting ring (310).

2. The explosion-proof housing of a battery according to claim 1, characterized in that: The explosion-proof disk (320) is an arc-shaped sheet structure, which includes a convex surface (3201) and a concave surface (3202), and the convex surface (3201) is located on a side away from the inside of the housing (100); A plurality of intersecting explosion-proof notches (3203) are etched on the convex surface (3201), and explosion-proof points (3204) are arranged at the intersections of the explosion-proof notches (3203).

3. The explosion-proof housing of a battery according to claim 2, characterized in that: The explosion-proof plate (320) is centrally symmetrical in shape, and the explosion-proof point (3204) is located at its symmetry center.

4. The explosion-proof housing of a battery according to claim 1, characterized in that: A first cover plate (110) and a second cover plate (120) are fixedly connected to the shell (100); the first cover plate (110) and the second cover plate (120) are respectively located at two ends of the shell (100); and two poles (111) are arranged on the first cover plate (110).

5. The explosion-proof housing of a battery according to claim 4, characterized in that: One end of the flow guide cavity (201) is a closed end, and the other end is an open end; the open end is located at an end of the housing (100) away from the pole body (111).

6. The explosion-proof housing of a battery according to claim 1, characterized in that: A plurality of inclined guide plates (210) are arranged on the guide cover plate (200), one end of the guide plate (210) is connected to the edge of the guide cover plate (200), and the other end is located in the middle area of ​​the guide cover plate (200); wherein the end of the guide plate (210) points to the opening end of the guide cavity (201).

7. The explosion-proof housing of a battery according to claim 1, characterized in that: An extension portion (311) is provided on the periphery of the connecting ring (310), and the extension portion (311) is clamped on the inner side wall of the housing (100).

8. The explosion-proof housing of a battery according to claim 7, characterized in that: The outer edge of the connecting ring (310) is also provided with a plurality of clamping portions (312) for clamping the housing (100).

9. The explosion-proof housing of a battery according to claim 1, characterized in that: A plurality of limiting protrusions (102) are arranged on the inner side wall of the housing (100).

10. A battery, characterized in that: An explosion-proof housing comprising a battery as claimed in any one of claims 1 to 9 and A battery cell (400) is located inside a housing (100), and a gap area (410) is reserved between a side wall of the battery cell (400) and an inner side wall of the housing (100).

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