Battery cell cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate assembly and a battery cell, and the battery cell cover plate assembly comprises a cover plate, an anti-explosion valve and a protective cover; wherein the anti-explosion valve and the protective cover are both installed on the cover plate, the protective cover covers the anti-explosion valve, and an exhaust port communicated with the interior of the protective cover is formed in the protective cover. According to the battery cell cover plate assembly provided by the invention, the protective cover covers the explosion-proof valve, so that when thermal runaway occurs in the battery and internal air pressure breaks through the explosion-proof valve, the protective cover can block substances which are sprayed out of the explosion-proof valve and participate in side reaction in the battery cell, the sprayed substances can be prevented from affecting the adjacent battery cell, short circuit can be effectively avoided, and the service life of the battery cell is prolonged. And finally, thermal runaway is prevented from being induced, and safety and reliability are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cover assembly and a battery cell. Background Art

[0002] At present, explosion-proof valves are installed on the covers of battery cells. When thermal runaway occurs in the battery cell, the high-temperature and high-pressure gas inside the battery cell will break through the explosion-proof valve and exhaust. At this time, the chemical reaction inside the battery cell is intense, and some substances involved in the side reaction will be ejected from the explosion-proof valve hole. The ejected substances will affect the adjacent battery cells, causing short circuits, etc., and then inducing thermal runaway. Utility Model Content

[0003] The purpose of the present application is to provide a battery cell cover assembly and a battery cell, which to a certain extent solves the technical problem in the prior art that when the battery cell suffers thermal runaway, the high-temperature and high-pressure gas inside the battery cell will break through the explosion-proof valve and exhaust. At this time, the chemical reaction inside the battery cell is intense, and some substances participating in the side reaction will be ejected from the explosion-proof valve hole. The ejected substances will affect the adjacent battery cells, causing short circuits, etc., and then inducing thermal runaway.

[0004] The present application provides a battery cell cover assembly, comprising: a cover, an explosion-proof valve and a protective cover; wherein, the explosion-proof valve and the protective cover are both installed on the cover, and the protective cover is arranged on the outside of the explosion-proof valve, and the protective cover is formed with an exhaust port connected to its interior.

[0005] In the above technical solution, further, the exhaust port is formed on the side of the protective cover.

[0006] In any of the above technical solutions, further, along the height direction of the protective cover, both ends of the exhaust port pass through the top and bottom of the protective cover respectively.

[0007] In any of the above technical solutions, further, the exhaust port extends in the height direction of the protective cover.

[0008] In any of the above technical solutions, further, there are multiple exhaust ports, which are sequentially spaced apart along the outer circumference of the protective cover.

[0009] In any of the above technical solutions, further, the protective cover and the cover plate are connected by welding or gluing.

[0010] In any of the above technical solutions, further, the protective cover is made of metal.

[0011] In any of the above technical solutions, further, along a preset direction, the cover plate is formed with mounting holes running through both sides thereof, and the explosion-proof valve is installed in the mounting holes.

[0012] In any of the above technical solutions, further, a first guide groove and a second guide groove are formed on the inner side of the cover plate close to the pole core; the first guide groove is arranged at intervals around the outer periphery of the mounting through hole; one end of the second guide groove is connected to the first guide groove, and the other end of the second guide groove extends in a direction away from the explosion-proof valve.

[0013] In any of the above technical solutions, further, along the width direction of the cover plate, the second guide groove is provided on at least one side of the first guide groove.

[0014] In any of the above technical solutions, further, the minimum distance between the second guide groove and the edge of the cover plate is a, and 5mm≤a≤6mm.

[0015] In any of the above technical solutions, further, the first guide groove is annular.

[0016] In any of the above technical solutions, further, the second guide groove is in a straight line shape.

[0017] In any of the above technical solutions, further, the battery cell cover plate assembly also includes a lower insulating member, and the lower insulating member is arranged on the inner side of the cover plate close to the pole core.

[0018] In any of the above technical solutions, further, along the preset direction, an air guide hole is provided at a position of the lower insulating member corresponding to the installation hole of the cover plate, and a supporting rib is provided in the air guide hole.

[0019] In any of the above technical solutions, further, one of the lower insulating member and the cover plate is formed with a positioning hole, and the other one is formed with a positioning protrusion, and the positioning protrusion is installed in the positioning hole.

[0020] This application also provides a battery cell comprising a housing, a pole core, and a cell cover assembly according to any of the above technical solutions, wherein the pole core is mounted within the housing, and the cell cover assembly seals the open end of the housing. Therefore, all the beneficial technical effects of the cell cover assembly are achieved, and no further details are given here.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] In the battery cell cover assembly provided in the present application, a protective cover is provided on the outer cover of the explosion-proof valve. When the battery suffers from thermal runaway and the internal air pressure breaks through the explosion-proof valve, the protective cover can block the substances participating in the side reaction inside the battery cell that are ejected by the explosion-proof valve, thereby preventing the ejected substances from spreading to adjacent battery cells, effectively avoiding short circuits, and ultimately avoiding inducing thermal runaway, thereby improving safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 An assembly diagram of the cover plate and protective cover provided in an embodiment of the present application;

[0025] Figure 2 for Figure 1 Schematic diagram of a local enlarged structure;

[0026] Figure 3 Another assembly diagram of the cover plate and the protective cover provided in an embodiment of the present application;

[0027] Figure 4 Another assembly diagram of the cover plate and the protective cover provided in an embodiment of the present application;

[0028] Figure 5 for Figure 4 Schematic diagram of a local enlarged structure;

[0029] Figure 6 A schematic structural diagram of a cell cover assembly provided in an embodiment of the present application;

[0030] Figure 7 A schematic structural diagram of a lower insulating member provided in an embodiment of the present application;

[0031] Figure 8 An assembly diagram of the battery cell cover assembly provided in an embodiment of the present application;

[0032] Figure 9 This is an exploded view of the battery cell cover assembly provided in an embodiment of the present application.

[0033] Reference numerals:

[0034] 1-cover plate, 11-mounting through hole, 12-first guide groove, 13-second guide groove, 14-step, 15-positioning hole, 2-explosion-proof valve, 3-protective cover, 31-exhaust port, 4-lower insulation member, 41-support rib, 411-annular rib, 412-strip connecting rib, 42-positioning protrusion, 5-pole, 6-riveted block, 7-upper plastic, 8-sealing ring. DETAILED DESCRIPTION

[0035] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0036] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0037] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] Refer to the following Figures 1 to 9 The battery cell cover assembly and the battery cell according to some embodiments of the present application are described.

[0041] Example 1

[0042] See also Figures 1 to 6As shown, an embodiment of the present application provides a battery cell cover assembly, comprising: a cover 1, an explosion-proof valve 2 and a protective cover 3; wherein, the explosion-proof valve 2 and the protective cover 3 are both installed on the cover 1, and the protective cover 3 is arranged on the outside of the explosion-proof valve 2, and the protective cover 3 is formed with an exhaust port 31 connected to the interior thereof, and when thermal runaway occurs in the battery cell, normal exhaust can be discharged through this exhaust port 31.

[0043] According to the structure described above, it can be seen that in the battery cover assembly provided by the present application, a protective cover 3 is provided on the outer cover of the explosion-proof valve 2. When the battery is in thermal runaway and the internal air pressure breaks through the explosion-proof valve 2, the protective cover 3 can block the substances participating in the side reaction inside the battery cell that are ejected by the explosion-proof valve 2, thereby preventing the ejected substances from spreading to adjacent battery cells, effectively avoiding short circuits, and ultimately avoiding inducing thermal runaway, thereby improving safety and reliability.

[0044] In this embodiment, preferably, Figures 1 to 3 As shown, the exhaust port 31 is formed on the side of the protective cover 3 .

[0045] According to the structure described above, it can be seen that the exhaust port 31 is arranged on the side of the protective cover 3, the opening area is larger, and the exhaust effect is better when the battery cell has thermal runaway.

[0046] It should be noted that the exhaust port 31 is not limited to being arranged at the side of the protective cover 3 , and the exhaust port 31 can also be arranged at a position such as the top of the protective cover 3 , depending on actual needs.

[0047] In this embodiment, preferably, Figures 1 to 3 As shown, along the height direction of the protective cover 3 , both ends of the exhaust port 31 pass through the top and bottom of the protective cover 3 respectively.

[0048] According to the structure described above, one end of the exhaust port 31 is opened to and passes through the bottom of the protective cover 3, and the other end of the exhaust port 31 is opened to and passes through the top of the protective cover 3. This not only lengthens the exhaust port 31, but also makes it easier to process and improves the efficiency of processing and manufacturing.

[0049] Furthermore, preferably, the exhaust port 31 extends along the height direction of the protective cover 3, which is more regular and convenient for processing and manufacturing. Of course, it is not limited to this. The exhaust port 31 can also extend along the direction forming an acute angle or an obtuse angle with the height direction of the protective cover 3, depending on actual needs.

[0050] It should be noted that: it is not limited to the above-mentioned "along the height direction of the protective cover 3, the two ends of the exhaust port 31 respectively pass through the top and bottom of the protective cover 3", and the exhaust port 31 can also be made to pass through only the bottom of the protective cover 3 along the height direction of the protective cover 3, or the exhaust port 31 only passes through the top of the protective cover 3, or the exhaust port 31 does not pass through the top and bottom of the protective cover 3, and the specific selection is based on actual needs.

[0051] In this embodiment, preferably, Figures 1 to 3 As shown, there are multiple exhaust ports 31 , which are sequentially spaced apart along the outer circumference of the protective cover 3 .

[0052] According to the structure described above, multiple exhaust gaps are set along the outer periphery of the protective cover 3 to increase the exhaust rate when the battery cell is thermally runaway, thereby improving safety and reliability. In addition, there is a shielding structure between the exhaust ports 31, which can also prevent the material inside the battery cell from being sprayed onto the adjacent battery cell.

[0053] It should be noted that the number of the exhaust port 31 is not limited to multiple, but can also be one, and it can extend along the outer periphery of the protective cover 3, etc. Of course, it is not limited to this, and the specific selection is based on actual needs.

[0054] In this embodiment, preferably, the protective cover 3 and the cover plate 1 are connected by welding.

[0055] According to the structure described above, it can be seen that the protective cover 3 is fixed to the cover plate 1 by welding, which has a better connection effect.

[0056] It should be noted that the connection method between the protective cover 3 and the cover plate 1 is not limited to welding, and other methods can also be used for connection, such as gluing, and the specific method is selected according to actual needs.

[0057] In this embodiment, preferably, the material of the protective cover 3 is metal.

[0058] According to the structure described above, the protective cover 3 made of metal material can withstand high temperatures and is not easily deformed or damaged, thereby preventing blockage and explosion prevention. At the same time, it also plays a certain protective role for the explosion-proof valve 2.

[0059] Furthermore, preferably, the material of the protective cover 3 is the same as that of the cover plate 1 to facilitate welding.

[0060] It should be noted that the material of the protective cover 3 is not limited to metal, and can also be made of hard high-temperature resistant rubber and other materials, which can be selected according to actual needs.

[0061] In this embodiment, preferably, Figures 1 to 3As shown, the protective cover 3 is a circular cover, which is mainly adapted to the circular explosion-proof valve 2, and has a regular shape, which is easy to process and manufacture. Of course, the shape of the protective cover 3 is not limited to this, for example, it can also be square or polygonal, etc., and is designed according to actual needs.

[0062] In this embodiment, preferably, Figures 4 to 6 As shown, along a preset direction, the cover plate 1 is formed with mounting holes 11 running through both sides thereof, and the explosion-proof valve 2 is installed in the mounting holes 11 .

[0063] According to the structure described above, the explosion-proof valve 2 is installed in the mounting hole 11 on the cover plate 1, which not only realizes the assembly of the explosion-proof valve 2 and the cover plate 1, but also can serve as an exhaust channel in the event of thermal runaway through the mounting hole 11.

[0064] Furthermore, preferably, the preset direction is the thickness direction of the cover plate 1 , but of course, it is not limited thereto.

[0065] In this embodiment, preferably, Figures 4 to 6 As shown, a first guide groove 12 and a second guide groove 13 are formed on the inner side of the cover plate 1 near the pole core; the first guide groove 12 is arranged at intervals around the outer periphery of the mounting through hole 11; one end of the second guide groove 13 is connected to the first guide groove 12, and the other end of the second guide groove 13 extends in a direction away from the explosion-proof valve 2.

[0066] According to the structure described above, when the large surface side of the cover plate 1 is parallel to the vertical direction, that is, when the battery cell is placed on its side, the electrolyte will flow along the inner wall of the cover plate 1 to the vicinity of the explosion-proof valve 2 under gravity conditions. At this time, the electrolyte will enter the first guide groove 12 along the step 14 between the first guide groove 12 and the explosion-proof valve 2, and finally flow along the second guide groove 13 to a position away from the explosion-proof valve 2, preventing the electrolyte from corroding the explosion-proof valve 2, thereby protecting the explosion-proof valve 2 and ensuring the reliability of the explosion-proof valve 2.

[0067] It should be noted that the large surface side of the cover plate 1 refers to the surface formed by the long side and the wide side.

[0068] In this embodiment, preferably, Figure 5 As shown, the minimum distance between the second guide groove 13 and the edge of the cover plate 1 is a, and 5mm≤a≤6mm.

[0069] According to the structure described above, it can be seen that the second guide groove 13 is kept at a certain distance from the edge of the cover plate 1. This can prevent the electrolyte from accumulating at the edge of the cover plate 1, and thus will not corrode the weld between the edge of the cover plate 1 and the shell, which can effectively prevent the cover plate 1 from failing.

[0070] In this embodiment, preferably, Figures 4 to 6As shown, there are two second guide grooves 13 , which are respectively arranged on two opposite sides of the first guide groove 12 along the width direction of the cover plate 1 .

[0071] According to the structure described above, the two second guide grooves 13 can quickly guide the electrolyte in the first guide groove 12 to an area away from the explosion-proof valve 2, and the two second guide grooves 13 are respectively arranged on opposite sides of the first guide groove 12 along the width direction of the cover plate 1, making full use of the space in the width direction of the cover plate 1 and effectively avoiding other components.

[0072] It should be noted that: it is not limited to the above-mentioned "along the width direction of the cover plate 1, second guide grooves 13 are provided on both sides of the opposite sides of the first guide groove 12", and other structures can also be adopted. For example: along the width direction of the cover plate 1, the second guide grooves 13 are provided only on the opposite side of the first guide groove 12. In addition, the position and number of the second guide grooves 13 can be designed according to actual needs. For example: the second guide grooves 13 can also be provided on the side of the first guide groove 12 along the length direction of the cover plate 1 or in a direction that is an acute angle or an obtuse angle to the length direction, and the number of the second guide grooves 13 can be one or more, such as two, three, four or five, etc.

[0073] In this embodiment, preferably, Figures 4 to 6 As shown, the first guide groove 12 is annular.

[0074] According to the structure described above, it is known that the electrolyte at any position on the periphery of the explosion-proof valve 2 can be guided into the first guide groove 12 .

[0075] Furthermore, preferably, the first guide groove 12 is a circular ring, which is compatible with the circular mounting hole 11. Of course, it is not limited to this. The first guide groove 12 can also be a ring with an inner circle and an outer square, or an annular structure of other shapes.

[0076] Of course, the first guide groove 12 is not limited to a complete annular structure, it can also be a part of an annular structure, etc.

[0077] In this embodiment, preferably, Figures 1 to 3 As shown, the second guide groove 13 is in a straight line shape.

[0078] According to the structure described above, the straight-line second guide groove 13 can quickly guide the electrolyte in the first guide groove 12 to an area away from the explosion-proof valve 2, occupies little space, and is easy to process and manufacture.

[0079] Of course, the second guide groove 13 is not limited to a straight-line structure, and can also be wavy or curved, etc., depending on actual needs.

[0080] In this embodiment, preferably, Figures 7 to 9 As shown, the battery cell cover assembly also includes a lower insulating member 4, and the lower insulating member 4 is arranged on the inner side of the cover 1 close to the pole core to play the role of insulation protection; one of the lower insulating member 4 and the cover 1 is formed with a positioning hole 15, and the other is formed with a positioning protrusion 42, and the positioning protrusion 42 is installed in the positioning hole 15.

[0081] According to the structure described above, the positioning protrusion 42 cooperates with the positioning hole 15 to play the role of assembly positioning, which helps to improve assembly efficiency and facilitates improving welding accuracy.

[0082] In this embodiment, preferably, Figure 7 and Figure 8 As shown, along a preset direction, for example, the thickness direction of the cover plate 1, an air guide hole is provided at a position of the lower insulating member 4 corresponding to the mounting hole 11 of the cover plate 1, and a support rib 41 is provided in the air guide hole, and the support rib 41 is connected to the side wall of the air guide hole.

[0083] According to the structure described above, the gas can be normally exhausted through the aforementioned gas through-holes when thermal runaway occurs in the battery cell, and the support ribs 41 are provided in the gas through-holes to support and protect the explosion-proof valve 2.

[0084] Furthermore, preferably, the support rib 41 includes an annular rib 411 and a strip-shaped connecting rib 412; wherein, the annular rib 411 is arranged in the air guide hole and is spaced apart from the inner side of the air guide hole, and the annular rib 411 is connected to the side wall of the air guide hole through the aforementioned strip-shaped connecting rib 412, which can not only ensure the exhaust effect during thermal runaway, but also play a supporting and protective role for the explosion-proof valve 2.

[0085] In this embodiment, preferably, Figure 9 As shown, the cell cover assembly also includes a pole 5, a rivet block 6, an upper plastic 7, a sealing ring 8 and other structures, which are conventional settings and will not be described in detail here. In addition, the number of the aforementioned poles 5 is not limited to two, and can also be one, etc.

[0086] Example 2

[0087] The second embodiment of the present application further provides a battery cell comprising a housing, a core, and the cell cover assembly described in the first embodiment above, wherein the core is mounted within the housing, and the cell cover assembly seals the open end of the housing. Therefore, the battery cell cover assembly has all the beneficial technical effects of the cell cover assembly, and the same technical features and beneficial effects are not further described.

[0088] It should be noted that the housing is further provided with the aforementioned one battery cell cover assembly, and may also be provided with two battery cell cover assembly, depending on actual needs.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate, an explosion-proof valve and a protective cover; wherein the explosion-proof valve and the protective cover are both mounted on the cover plate, and the protective cover is arranged outside the explosion-proof valve, and the protective cover is formed with an exhaust port communicating with the interior thereof; Along a preset direction, the cover plate is formed with mounting holes penetrating through both sides thereof, and the explosion-proof valve is installed in the mounting holes; A first guide groove and a second guide groove are formed on the inner side of the cover plate close to the pole core; the first guide groove is arranged at intervals around the outer periphery of the mounting through hole; one end of the second guide groove is connected to the first guide groove, and the other end of the second guide groove extends in a direction away from the explosion-proof valve.

2. The battery cover assembly according to claim 1, characterized in that: The exhaust port is formed on a side of the protective cover.

3. The battery cover assembly according to claim 2, characterized in that: Along the height direction of the protective cover, the two ends of the exhaust port respectively pass through the top and bottom of the protective cover; and / or The exhaust port extends in a height direction of the protective cover.

4. The battery cover assembly according to claim 1, characterized in that: There are multiple exhaust ports, which are sequentially spaced apart along the periphery of the protective cover; and / or The protective cover is connected to the cover plate by welding or gluing; and / or The material of the protective cover is metal.

5. The battery cover assembly according to claim 1, characterized in that: Along the width direction of the cover plate, the second guide groove is provided on at least one side of the first guide groove; and / or The minimum distance between the second guide groove and the edge of the cover plate is a, and 5mm≤a≤6mm; and / or The first guide groove is annular; and / or The second guide groove is in a straight line shape.

6. The battery cover assembly according to claim 1, characterized in that: The cell cover plate assembly further includes a lower insulating member, and the lower insulating member is arranged on the inner side of the cover plate close to the pole core.

7. The battery cover assembly according to claim 6, characterized in that: Along the preset direction, an air guide hole is provided at a position of the lower insulating member corresponding to the mounting hole of the cover plate, and a supporting rib is provided in the air guide hole; and / or A positioning hole is formed on one of the lower insulating member and the cover plate, and a positioning protrusion is formed on the other of the lower insulating member and the cover plate, and the positioning protrusion is installed in the positioning hole.

8. A battery cell, characterized in that: The battery cell cover assembly comprises a shell, a pole core and a cell cover assembly according to any one of claims 1 to 7, wherein the pole core is installed in the shell, and the cell cover assembly is sealed on the open end of the shell.

Images