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 shielding component; wherein the anti-explosion valve is mounted on the cover plate, and the inner side and the outer side of the cover plate can be communicated through the anti-explosion valve; the shielding component is installed on the inner side of the cover plate in the thickness direction of the cover plate, and the shielding component at least can shield at least part of the anti-explosion valve in the first preset direction and is used for preventing at least part of the electrolyte from impacting the anti-explosion valve. In the battery cell cover plate assembly provided by the invention, the shielding component is arranged for the explosion-proof valve, so that main impact of electrolyte can be shielded at least along the thickness direction of the cover plate, the effect of protecting the explosion-proof valve is achieved, and the problems of damage to the explosion-proof valve, leakage of the battery cell, advanced opening of the explosion-proof valve and the like can be effectively avoided; and the battery cell is safer and more reliable.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell cover plate assembly and a battery cell. Background Art

[0002] As Figures 1 to 3 shown, a blade battery cell generally includes a housing, a pole group, an inner end plate 4', and a cover plate assembly. The pole group is installed in the housing, the cover plate assembly seals the opening of the housing, the inner end plate 4' is arranged between the end of the pole group and the cover plate assembly. The cover plate assembly includes a light aluminum plate 1', a lower plastic 3', an explosion-proof valve 2', etc. The explosion-proof valve 2' is installed on the light aluminum plate 1' and is communicated with the inner and outer sides of the light aluminum plate. The lower plastic 3' is formed with an exhaust groove and an exhaust through hole corresponding to the explosion-proof valve 2', and the inner end plate 4' correspondingly forms an exhaust cavity for exhausting gas. It can be seen that a cavity is formed between the explosion-proof valve 2' and the inner end plate 4'. When the explosion-proof valve 2' on the cover plate of the blade battery cell is at the bottom, the electrolyte will accumulate in the cavity. When the battery cell is shaken, the electrolyte will shake back and forth, continuously impacting the explosion-proof valve 2', causing damage to the explosion-proof valve 2', leakage of the battery cell, and premature opening of the explosion-proof valve 2'. Summary of the Utility Model

[0003] The purpose of the present application is to provide a battery cell cover plate assembly and a battery cell, which to a certain extent solve the technical problem in the prior art that when the explosion-proof valve on the cover plate of the blade battery cell is at the bottom, and a cavity is formed between the inner end plate at the bottom of the battery cell and the explosion-proof valve, the electrolyte will accumulate in the cavity. As the battery cell shakes, the electrolyte continuously impacts the explosion-proof valve, causing damage to the explosion-proof valve, leakage of the battery cell, and premature opening of the explosion-proof valve.

[0004] The present application provides a battery cell cover plate assembly, including: a cover plate, an explosion-proof valve, and a shielding member; wherein, the explosion-proof valve is installed on the cover plate, and along a first preset direction, the inner side of the cover plate can be communicated with the outer side of the cover plate via the explosion-proof valve; the shielding member is installed on the inner side of the cover plate along its thickness direction, and the shielding member can at least shield at least part of the explosion-proof valve along the first preset direction to block at least part of the electrolyte from impacting the explosion-proof valve.

[0005] In the above technical solution, further, the shielding member includes a main shielding plate and a supporting portion connected to each other; wherein, the supporting portion supports between the inner side of the cover plate and the main shielding plate, so that the main shielding plate is spaced apart from the explosion-proof valve along the thickness direction of the cover plate.

[0006] In any of the above technical solutions, further, along the first preset direction, the distance between the main shielding plate and the explosion-proof valve is c, and c≥0.3mm.

[0007] In any of the above technical solutions, further, along the second preset direction, the support portion is located outside the explosion-proof valve.

[0008] In any of the above technical solutions, further, along the second preset direction, the distance between the support portion and the explosion-proof valve is d, and d ≥ 1 mm.

[0009] In any of the above technical solutions, further, along the second preset direction, the support portions are provided on both sides of the explosion-proof valve.

[0010] In any of the above technical solutions, further, the main shielding plate and the support portions on both sides thereof form a structure of a U-shaped plate, and the opening of the U-shaped plate faces the explosion-proof valve.

[0011] In any of the above technical solutions, further, the shielding member is connected to the cover plate by welding; or

[0012] The shielding member is connected to the explosion-proof valve and / or the cover plate by gluing.

[0013] In any of the above technical solutions, further, the number of the shielding members is one and extends along the third preset direction, or the number of the shielding members is multiple and are arranged in sequence along the third preset direction.

[0014] In any of the above technical solutions, further, the battery cell cover plate assembly further includes a lower plastic part, the lower plastic part is installed inside the cover plate, and the lower plastic part forms an exhaust groove that is recessed toward the side away from the cover plate, and the opening of the exhaust groove faces the explosion-proof valve side; the exhaust groove is disposed opposite to the explosion-proof valve, and the shielding member is located in the exhaust groove.

[0015] This application also provides a battery cell, including a housing, a pole group, an end plate, and the battery cell cover plate assembly according to any of the above technical solutions. Among them, the pole group is installed in the housing, the battery cell cover plate assembly seals the opening end of the housing, the end plate is disposed between the pole group and the battery cell cover plate assembly, and the end plate is formed with an exhaust cavity and an auxiliary exhaust through hole communicating with the exhaust cavity. Therefore, it has all the beneficial technical effects of this battery cell cover plate assembly, which will not be elaborated here.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] In the cell cover plate assembly provided by the present application, a shielding member is provided for the explosion-proof valve, so that the main impact of the electrolyte can be shielded at least along the thickness direction of the cover plate, thereby playing a role in protecting the explosion-proof valve, and effectively avoiding problems such as damage to the explosion-proof valve, leakage of the cell, and premature opening of the explosion-proof valve, making the cell safer and more reliable. Description of the Drawings

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Structural schematic diagram of the cover plate assembly of the blade cell provided by the prior art;

[0020] Figure 2 For Figure 1 Partial enlarged structural schematic diagram;

[0021] Figure 3 Partial cross-sectional view of the blade cell provided by the prior art;

[0022] Figure 4 Exploded view of the cell cover plate assembly provided by the embodiment of the present application;

[0023] Figure 5 Another exploded view of the cell cover plate assembly provided by the embodiment of the present application;

[0024] Figure 6 Assembly drawing of the cover plate, explosion-proof valve and shielding member provided by the embodiment of the present application;

[0025] Figure 7 Structural schematic diagram of the shielding member provided by the embodiment of the present application;

[0026] Figure 8 Structural schematic diagram of the cover plate assembly provided by the embodiment of the present application;

[0027] Figure 9 For Figure 7 Cross-sectional view along the A-A section.

[0028] Reference Numerals:

[0029] 1'-Light aluminum plate, 2'-Explosion-proof valve, 3'-Lower plastic part, 4'-Inner end plate, 5'-Electrolyte;

[0030] 1 - Cover plate, 11 - Through hole, 12 - Installation groove, 2 - Explosion - proof valve, 3 - Shielding member, 31 - Main shielding plate, 32 - Support portion, 4 - Lower plastic part, 41 - Exhaust groove, 42 - Exhaust through - hole, 5 - Explosion - proof valve patch. Detailed implementation manners

[0031] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present application.

[0032] The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various 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 present application claimed, but merely represents the selected embodiments of the present application.

[0033] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0036] The following refers to Figures 4 to 9 Describe the cell cover plate assembly and the cell according to some embodiments of the present application.

[0037] Embodiment 1

[0038] Refer to Figures 4 to 9As shown in the figure, an embodiment of the present application provides a cell cover plate assembly, including: a cover plate 1, an explosion-proof valve 2, and a shielding member 3; wherein, the explosion-proof valve 2 is installed on the cover plate 1, and the explosion-proof valve 2 is in communication with the inner side and the outer side of the cover plate 1 along its thickness direction. Preferably, the first preset direction refers to the thickness direction of the cover plate 1, and this will also be used as an example for illustration hereinafter. Of course, it is not limited thereto;

[0039] The shielding member 3 is installed on the inner side of the cover plate 1 along its thickness direction, and the shielding member 3 can at least shield at least part of the explosion-proof valve 2 along the thickness direction of the cover plate 1, and is used to block at least part of the electrolyte from impacting the explosion-proof valve. Here, it should be noted that: along the thickness direction of the cover plate 1, the shielding member 3 can shield part of the structure of the explosion-proof valve 2 or all of the structure of the explosion-proof valve 2, which is specifically designed according to actual needs.

[0040] According to the structure described above, in the cell cover plate assembly provided by the present application, a shielding member 3 is provided for the explosion-proof valve 2, and thus it can at least shield the main impact of the electrolyte along the thickness direction of the cover plate 1, thereby playing a role in protecting the explosion-proof valve 2, and further effectively avoiding problems such as damage to the explosion-proof valve 2, leakage of the cell, and premature opening of the explosion-proof valve 2, making the cell safer and more reliable.

[0041] It should be noted that: the inner side of the cover plate 1 refers to the side of the cover plate 1 close to the cell, and the outer side of the cover plate 1 refers to the side of the cover plate 1 away from the cell, that is, the side exposed to the housing of the cell.

[0042] In addition, the cell cover plate assembly provided by the present application is not limited to being applied to blade cells, and can also be applied to square shell cells, etc.

[0043] In this embodiment, preferably, as Figure 6 and Figure 7 shown, the shielding member 3 includes a main shielding plate 31 and a support portion 32 which are connected; wherein, the support portion 32 supports between the inner side of the cover plate 1 and the main shielding plate 31, so that the main shielding plate 31 is spaced apart from the explosion-proof valve 2 along the thickness direction of the cover plate 1.

[0044] According to the structure described above, the main shielding plate 31 plays a main role in shielding the explosion-proof valve 2, and the support portion 32 plays a role in spacing the main shielding plate 31 from the explosion-proof valve 2 to avoid blocking the explosion-proof valve 2 and ensure the smoothness of the exhaust channel.

[0045] Further, preferably, the number of the supporting portions 32 is two, and they are supported on the two long side portions of the main shielding plate 31. The supporting portion 32 can also be a plate-like structure extending along the length direction of the main shielding plate 31. Then, the main shielding plate 31 and the supporting plate form a U-shaped plate structure. The two supporting portions 32 are located on the two long side portions of the explosion-proof valve 2, that is, the U-shaped plate is buckled outside the explosion-proof valve 2, playing a good role in protecting the explosion-proof valve 2. In addition, both sides of the U-shaped plate along its length direction are open, which does not affect the normal exhaust during thermal runaway.

[0046] It should be noted that: the supporting portion 32 is not limited to being arranged on the side portion of the long side of the explosion-proof valve 2, and it can also be arranged on the side portion of the wide side of the explosion-proof valve 2, which is specifically designed according to actual needs.

[0047] In addition, the number of the supporting portions 32 is not limited to two, and it can also be one, that is, the supporting portion 32 and the main shielding plate 31 form an L-shaped structure. Or the number of the supporting portions 32 is greater than two, such as three or four, etc. It is specifically designed reasonably in combination with the side portion of the main shielding plate 31. Especially when the number of the supporting portions 32 is equal to the number of the side portions of the main shielding plate 31, that is, finally an internally hollow structure with an opening on the side facing the explosion-proof valve 2 is formed by enclosing the main shielding plate 31, so as to completely cover the explosion-proof valve 2. Then, in this case, in order to ensure normal exhaust during thermal runaway, some small holes can be opened on the supporting portion 32.

[0048] In addition, the structure of the supporting portion 32 is not limited to the plate-like structure, and it can also be a block, and the number of them is multiple. The multiple blocks are sequentially arranged at intervals along the length direction of the main supporting plate, that is, the length direction of the explosion-proof valve 2.

[0049] In this embodiment, preferably, as Figure 9 shown, along the thickness direction of the cover plate 1, the distance between the main shielding plate 31 and the explosion-proof valve 2 is c, and c≥0.3 mm.

[0050] According to the structure described above, if the gap between the main shielding plate 31 and the explosion-proof valve 2 is too small, it will affect the normal exhaust during thermal runaway. Therefore, the distance between the main shielding plate 31 and the explosion-proof valve 2 is kept greater than or equal to 0.3 mm, so as to ensure the smoothness of exhaust during thermal runaway, and can effectively avoid damaging the explosion-proof valve 2 when installing the shielding member 3.

[0051] In this embodiment, preferably, as Figure 6 and Figure 9 shown, along the second preset direction, the supporting portion 32 is located outside the explosion-proof valve 2.

[0052] According to the structure described above, when the support portion 32 is supported outside the explosion-proof valve 2, it can effectively avoid damaging the explosion-proof valve 2 when installing the shielding member 3, ensure the normal operation of the explosion-proof valve 2, and will not block the explosion-proof valve 2.

[0053] Further, preferably, the second preset direction is the width direction of the explosion-proof valve 2, and this will also be used as an example for illustration later. Of course, it is not limited to this. For example, the second preset direction can also be the length direction of the explosion-proof valve 2, etc.

[0054] In this embodiment, preferably, as Figure 9 shown, along the width direction of the explosion-proof valve 2, the distance between the support portion 32 and the explosion-proof valve 2 is d, and d ≥ 1 mm.

[0055] According to the structure described above, along the width direction of the explosion-proof valve 2, keeping the distance between the support portion 32 and the explosion-proof valve 2 greater than or equal to 1 mm can avoid damaging the explosion-proof valve 2 when installing the shielding member 3.

[0056] In this embodiment, preferably, as Figure 6 shown, the shielding member 3 is only connected to the cover plate 1 by welding.

[0057] According to the structure described above, welding the shielding member 3 to the cover plate 1 serves to fix the shielding member 3 and prevent it from shifting.

[0058] It should be noted that: it is not limited to the above-mentioned connection of the shielding member 3 and the cover plate 1 by welding. The two can also be connected by gluing or other means, which is specifically designed according to actual needs.

[0059] In this embodiment, preferably, as Figure 6 shown, the number of shielding members 3 is one, and it extends along the third preset direction.

[0060] According to the structure described above, using one shielding member 3 can not only meet the shielding effect on the explosion-proof valve 2, but also reduce the assembly steps and manufacturing steps compared with multiple shielding members 3.

[0061] Further, preferably, the third preset direction is the length direction of the explosion-proof valve 2, and this will also be used as an example for illustration later. Of course, it is not limited to this. For example: the third preset direction can also be the width direction of the explosion-proof valve 2, etc.

[0062] Further, preferably, the cover plate 1 has the same length direction as the lower plastic part 4, and preferably, the explosion-proof valve 2 has the same length direction as the lower plastic part 4 and the cover plate 1. Of course, it is not limited thereto and can also be set according to actual needs. It should be noted that: the number of the shielding members 3 is not limited to one, and the number of the shielding members 3 is multiple. When the number of the shielding members 3 is multiple, the multiple shielding members 3 are sequentially arranged along the length direction of the explosion-proof valve 2, and are specifically selected according to actual needs.

[0063] In this embodiment, preferably, as Figure 4 , Figure 5 and Figure 9 shown, the battery cell cover plate assembly further includes a lower plastic part 4. The lower plastic part 4 is installed on the inner surface of the cover plate 1 close to the electrode group, and the lower plastic part 4 forms an exhaust groove 41 that is recessed toward the electrode group, and the opening of this exhaust groove 41 faces the explosion-proof valve 2. This exhaust groove 41 is arranged directly opposite the explosion-proof valve 2. The aforementioned shielding member 3 is located in this exhaust groove 41, providing an avoidance space for the shielding member 3. Preferably, an exhaust through hole 42 is provided on the side wall of the exhaust groove 41.

[0064] In this embodiment, preferably, as Figure 4 , Figure 5 and Figure 9 shown, along the thickness direction of the cover plate 1, and from the outside to the inside, the cover plate 1 is formed with a through hole 11 and a mounting groove 12 that are sequentially arranged and communicated with each other, and the mounting groove 12 penetrates through the inside of the cover plate 1. Preferably, the explosion-proof valve 2 can be installed in this mounting groove 12, and the through hole 11 communicated with the mounting groove 12 can be used for exhausting gas.

[0065] Further, preferably, the battery cell cover plate assembly further includes an explosion-proof valve patch 5, and the explosion-proof valve patch 5 is pasted on the outer surface of the cover plate 1 and covers the aforementioned through hole 11, playing a role in protecting the explosion-proof valve 2. Of course, it is not limited thereto, and a groove can also be designed for installing the explosion-proof valve patch 5.

[0066] Embodiment Two

[0067] Embodiment Two of the present application further provides a battery cell, including a housing, an electrode group, an end plate, and the battery cell cover plate assembly described in Embodiment One above. Among them, the electrode group is installed in the housing, the battery cell cover plate assembly seals the opening end of the housing, the end plate is arranged between the electrode group and the battery cell cover plate assembly, and the end plate is formed with an exhaust cavity and an auxiliary exhaust through hole communicated with the exhaust cavity. Therefore, it has all the beneficial technical effects of the battery cell cover plate assembly, and the same technical features and beneficial effects will not be described again.

[0068] It should be noted that: along the thickness direction of the cover plate 1, the exhaust cavity, the exhaust through hole 42, and the exhaust groove 41 are arranged opposite to each other. When the electrolyte accumulated in the exhaust cavity shakes, it will impact the explosion-proof valve 2 through the aforementioned exhaust groove 41 and exhaust through hole 42. In this application, a shielding member 3 is provided at the position corresponding to the exhaust through hole 42, so that the shielding member 3 blocks most of the liquid in the exhaust cavity from impacting the explosion-proof valve 2 through the exhaust through hole 42 and the exhaust groove 41. Of course, part of the structures of the exhaust cavity and the exhaust through hole 42 can also be staggered, etc., which is specifically designed according to actual needs.

[0069] In addition, the housing may be formed with an open end, and the aforementioned battery cell cover plate assembly may be installed at this open end. The housing may also be formed with two open ends, and at least one of the two open ends is installed with the aforementioned battery cell cover plate assembly, which is specifically designed according to actual needs.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application 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 or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 shielding member; wherein the explosion-proof valve is installed on the cover plate, and along a first preset direction, the inner side of the cover plate can be connected to the outer side of the cover plate via the explosion-proof valve; The shielding member is installed on the inner side of the cover plate along the thickness direction thereof, and the shielding member can shield at least part of the explosion-proof valve at least along the first preset direction, so as to prevent at least part of the electrolyte from impacting the explosion-proof valve.

2. The battery cover assembly according to claim 1, characterized in that: The shielding member includes a main shielding plate and a supporting portion connected to each other; wherein the supporting portion is supported between the inner side of the cover plate and the main shielding plate, so that the main shielding plate and the explosion-proof valve are spaced apart along the thickness direction of the cover plate.

3. The battery cover assembly according to claim 2, characterized in that: Along the first preset direction, the distance between the main baffle plate and the explosion-proof valve is c, and c≥0.3 mm.

4. The battery cover assembly according to claim 2, characterized in that: Along the second preset direction, the support portion is located outside the explosion-proof valve.

5. The battery cover assembly according to claim 4, characterized in that: Along the second preset direction, the distance between the support portion and the explosion-proof valve is d, and d≥1 mm.

6. The battery cover assembly according to claim 4, characterized in that: Along the second preset direction, the supporting parts are arranged on both sides of the explosion-proof valve.

7. The battery cover assembly according to claim 6, characterized in that: The main shielding plate and the supporting parts located on both sides thereof form a U-shaped plate structure, and the opening of the U-shaped plate is arranged toward the explosion-proof valve.

8. The battery cover assembly according to claim 1, characterized in that: The shielding member is connected to the cover plate by welding; or The shielding member is connected to the explosion-proof valve and / or the cover plate by gluing.

9. The battery cell cover plate assembly according to any one of claims 1 to 8, characterized in that: The number of the shielding member is one and extends along the third preset direction, or the number of the shielding member is multiple and arranged sequentially along the third preset direction; and / or The battery cell cover plate assembly also includes a lower plastic part, which is installed on the inner side of the cover plate, and the lower plastic part forms an exhaust groove recessed toward a side away from the cover plate, and the opening of the exhaust groove is arranged toward the explosion-proof valve side; the exhaust groove is arranged opposite to the explosion-proof valve, and the shielding member is located in the exhaust groove.

10. A battery cell, characterized in that: It comprises a shell, a pole group, an end plate and a battery cell cover assembly as described in any one of claims 1 to 9; wherein the pole group is installed in the shell, the battery cell cover assembly is sealed on the open end of the shell, the end plate is arranged between the pole group and the battery cell cover assembly, and the end plate is formed with an exhaust cavity and an auxiliary exhaust through hole connected to the exhaust cavity.

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