Battery top cover and battery

Abstract

The utility model provides a battery top cover and battery wherein the battery top cover comprises a cover plate with a liquid injection hole, a plurality of connecting pieces connected to the bottom of the cover plate and surrounding the liquid injection hole, and a blocking assembly, a connecting hole is arranged between every two adjacent connecting pieces, the blocking assembly comprises a first blocking piece and a second blocking piece, and the first blocking piece and the second blocking piece are arranged in parallel. The first blocking pieces are arranged between the two corresponding adjacent connecting pieces and block part of the connecting holes, the second blocking pieces are connected to the inner side walls, close to the axis of the liquid injection hole, of the multiple connecting pieces, gaps are formed between the second blocking pieces and the inner side walls, and the connecting holes communicate with the liquid injection hole through the gaps. In the process that gas in the battery flows out of the liquid injection hole, most electrolyte carried by the gas can be retained in the battery or in the liquid injection hole due to the blocking of the blocking assembly, so that the amount of the electrolyte sprayed out of the liquid injection hole is reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a battery top cover and a battery. Background Art

[0002] After injecting electrolyte into a battery, it may sometimes spray out of the injection hole. In the prior art, only protective components are provided around the injection hole to prevent the sprayed electrolyte from contaminating the battery. Therefore, a structure is needed to reduce the amount of electrolyte sprayed from the injection hole, or even prevent it from spraying out. Utility Model Content

[0003] The embodiments of the present utility model provide a battery top cover and a battery, so as to reduce the amount of electrolyte sprayed out from the injection hole during the injection process.

[0004] In a first aspect, an embodiment of the present utility model provides a battery top cover, which includes:

[0005] The cover plate is provided with a liquid injection hole along the thickness direction of the cover plate;

[0006] A plurality of connecting members connected to the bottom of the cover plate and surrounding the liquid injection hole, with a connecting hole being provided between every two adjacent connecting members; and

[0007] blocking components;

[0008] Among them, the blocking component includes a first blocking member and a second blocking member. The first blocking member is arranged between the corresponding adjacent two connecting members and blocks part of the connecting hole. The second blocking member is connected to the inner side wall of the multiple connecting members close to the axis of the injection hole, and there is a gap between the inner side wall and the connecting hole. The injection hole is connected to the injection hole through the gap.

[0009] In one embodiment, the first blocking member is connected to the bottom of the cover plate, and the bottom of the gap is higher than the bottom end of the first blocking member away from the cover plate.

[0010] In one embodiment, there are multiple second blocking members, and the multiple second blocking members are arranged on the first blocking member along the thickness direction of the cover plate.

[0011] In one embodiment, the inner side walls of multiple first barriers and multiple connecting members include relative first and second parts; among two adjacent second barriers, one end of one of the second barriers is connected to the first part, and the other end of one of the second barriers is spaced apart from the second part, and one end of the other second barrier is connected to the second part, and the other end of the other second barrier is spaced apart from the first part.

[0012] In one embodiment, the other end of one of the second blocking members overlaps with the other end of the other second blocking member in the thickness direction of the cover plate.

[0013] In one embodiment, the number of second barriers is N, and the N second barriers are arranged in a direction from the bottom of the cover plate to the top of the cover plate. The distance between the Mth second barrier and the bottom end of the first barrier is L1*M / (N+1), where M and N are positive integers, M is less than or equal to N, and L1 is the size of the first barrier in the thickness direction of the cover plate.

[0014] In one embodiment, 1 / 2*D≤L2≤2 / 3*D; wherein L2 is the maximum distance between the other end of the second barrier and the connected first part or second part, and D is the diameter of the injection hole.

[0015] In one embodiment, 5≥D2 / D1≥2, 4 / 5≥L1 / L3≥2 / 3; wherein D1 is the arc length of the outer arc edge of the orthographic projection pattern of the connecting member on the cover plate, D2 is the arc length of the outer arc edge of the orthographic projection pattern of the first blocking member on the cover plate, L1 is the dimension of the first blocking member in the thickness direction of the cover plate, and L3 is the dimension of the connecting member in the thickness direction of the cover plate.

[0016] In one embodiment, the battery top cover further includes a bottom plate arranged opposite to the liquid injection hole, and a plurality of connectors are connected between the bottom plate and the cover plate; and / or the first barrier, the second barrier and the connector are integrally formed.

[0017] In a second aspect, an embodiment of the present invention provides a battery, comprising the battery top cover as described in the first aspect.

[0018] The utility model provides a battery top cover and a battery, wherein the battery top cover includes a cover plate provided with a liquid injection hole, a plurality of connectors connected to the cover plate and surrounding the liquid injection hole, and a blocking assembly, a connecting hole is provided between every two adjacent connectors, the blocking assembly includes a first blocking member and a second blocking member, the first blocking member is provided between the corresponding two adjacent connectors and blocks part of the connecting hole, the second blocking member is connected to the inner side walls of the plurality of connectors close to the axis of the liquid injection hole, and a gap is formed between the second blocking member and the inner side walls, and the connecting hole is connected to the liquid injection hole through the gap. The utility model provides a connecting piece and a blocking component on a side of the liquid injection hole of the cover plate close to the battery housing, so that when the gas inside the battery flows out of the liquid injection hole, the electrolyte carried by the gas is blocked by the first blocking piece in the blocking component, so that part of the electrolyte carried by the gas will not be drawn out due to the effect of gravity and will continue to remain in the battery. When part of the electrolyte carried by the gas enters the liquid injection hole, another part of the electrolyte will not flow out of the liquid injection hole due to the blocking of the second blocking piece in the blocking component and under the influence of its own gravity, thereby finally reducing the amount of electrolyte sprayed from the liquid injection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic structural diagram of a battery provided by an embodiment of the present utility model;

[0021] Figure 2 yes Figure 1 A schematic structural diagram of the connection between the blocking assembly of the battery top cover and the connector;

[0022] Figure 3 yes Figure 2 Exploded diagram;

[0023] Figure 4 yes Figure 3 A top view of

[0024] Figure 5 yes Figure 4 sectional view of

[0025] Description of reference numerals:

[0026] 100, battery; 210, cover plate; 211, liquid injection hole; 220, connector; 231, first barrier; 232, second barrier; 240, connection hole; 300, battery housing; 400, bottom plate. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present utility model, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0028] After the electrolyte is injected into the battery, the electrolyte may sometimes be ejected from the injection hole. In order to reduce the amount of electrolyte ejected from the injection hole, the embodiment of the present invention provides a battery 100. Figure 1 , Figure 1 It is a structural schematic diagram of the battery 100 provided in an embodiment of the present invention. The battery 100 includes a battery top cover and a battery shell 300, wherein there is a accommodating cavity for accommodating electrolyte inside the battery shell 300, and the battery top cover is connected to the opening of the battery shell 300 to seal the accommodating cavity.

[0029] Please refer to Figure 2 , Figure 2 yes Figure 1 A schematic diagram of a structure in which a blocking assembly of a battery top cover is connected to a connector 220, wherein the battery top cover includes a cover plate 210 (reference Figure 1 ), multiple connectors 220, and a blocking assembly, wherein the cover plate 210 is provided with a liquid injection hole 211 penetrating the upper and lower surfaces of the cover plate 210 along the thickness direction of the cover plate 210. The multiple connectors 220 surround the liquid injection hole 211 on the cover plate 210 and are connected to the bottom of the cover plate 210. At the same time, a connecting hole 240 is provided between each two adjacent connectors 220, so that the interior of the battery is connected to the liquid injection hole 211 through the connecting hole 240. The blocking assembly includes multiple first blocking members 231 and multiple second blocking members 232. Each first blocking member 231 is provided between corresponding adjacent connectors 220 and partially blocks the connecting hole 240. The second blocking member 232 is connected to the inner side wall of the multiple connectors 220 near the axis of the liquid injection hole 211, and has a gap between the inner wall and the connecting member 220, so that some gas inside the battery can pass through the connecting hole 240 and then flow out of the liquid injection hole 211 through the gap. In this embodiment, the upper surface of the cover plate 210 is the side of the cover plate 210 away from the battery housing 300 (refer to Figure 1 ) side, the lower surface of the cover plate 210 is the side of the cover plate 210 close to the battery housing 300.

[0030] In this embodiment, a connector 220 and a blocking assembly are provided on the side of the cover plate 210 close to the battery housing 300, so that when the gas inside the battery flows out from the injection hole 211, the electrolyte carried by the gas during movement is blocked by the first blocking member 231 in the blocking assembly, so that a portion of the electrolyte carried by the gas will not be drawn into the injection hole 211 due to the action of gravity, but will continue to remain in the accommodating cavity. When another portion of the electrolyte carried by the gas enters the injection hole 211, a portion of the electrolyte carried by the gas in the injection hole 211 will be blocked by the second blocking member 232 in the blocking assembly and under the influence of its own gravity, so that it will remain in the injection hole 211 and will not be sprayed out from the injection hole 211, thereby ultimately achieving the effect of reducing the amount of electrolyte sprayed from the injection hole 211.

[0031] In some embodiments, the first barrier 231 is connected to the bottom of the cover plate 210 so that there is no gap between the end of the first barrier 231 close to the cover plate 210 and the cover plate 210, and at the same time, the bottom of the gap between the second barrier 232 and the inner wall is higher than the bottom end of the first barrier 231 away from the cover plate 210.

[0032] In this embodiment, the end of the first barrier 231 closest to the cover plate 210 is connected to the lower surface of the cover plate 210, eliminating any gap at the connection between the first barrier 231 and the cover plate 210. Furthermore, the height of the gap between the second barrier 232 and the inner sidewall is higher than the height of the bottom end of the first barrier 231 away from the cover plate 210. Therefore, when gas within the battery flows out of the liquid injection hole 211, it can only enter the liquid injection hole 211 through the connection hole 240 located between the first barrier 231 and the connector 220 and below the second barrier 232. It then passes through the blocking process of the second barrier 232 as described above and finally flows out of the liquid injection hole 211. Therefore, during the process of filling and degassing the battery 100, there is no risk of partial electrolyte flowing into the liquid injection hole 211 through the gap between the first barrier 231 and the cover plate 210 and then out of the liquid injection hole 211, thereby further reducing the amount of electrolyte flowing out of the liquid outlet.

[0033] In some embodiments, there are multiple second blocking members 232 , and the multiple second blocking members 232 are arranged on the first blocking member 231 along the thickness direction of the cover plate 210 .

[0034] In this embodiment, the gas located in the injection hole 211 will flow out of the injection hole 211 due to the vacuum operation. During this process, since the injection hole 211 is provided with multiple second barriers 232 arranged on the first barrier 231 along the thickness direction of the cover plate 210, the electrolyte carried by the gas will be blocked by the multiple second barriers 232. The specific blocking process can be referred to the above description. Ultimately, most or even all of the electrolyte carried by the gas is retained in the injection hole 211 due to the blocking effect of the second barriers 232, and finally flows into the interior of the battery through the connecting hole 240, thereby reducing the amount of waste caused by the spraying of electrolyte from the liquid outlet, and also effectively avoiding the situation where the electrolyte is sprayed out of the injection hole 211 and contaminates the battery 100.

[0035] In some embodiments, please refer to Figure 2 and Figure 3 , Figure 3 yes Figure 2Exploded view, the inner side walls of the multiple first barriers 231 and the multiple connecting members 220 include relative first and second parts, and the multiple second barriers 232 are arranged on the first barrier 231 along the thickness direction of the cover plate 210, wherein, in two adjacent second barriers 232, one end of one of the second barriers 232 is connected to the first part, and the other end of one of the second barriers 232 is spaced apart from the second part, and one end of the other second barrier 232 is connected to the second part, and the other end of the other second barrier 232 is spaced apart from the first part.

[0036] In this embodiment, through the above-mentioned arrangement, among the multiple second barrier members 232 arranged on the first barrier member 231 along the thickness direction of the cover plate 210, two adjacent second barrier members 232 are arranged relative to each other, thereby avoiding the problem that the corresponding ends of the two adjacent second barrier members 232 are both connected to the first part or the second part, so that the second barrier members 232 cannot effectively block the electrolyte carried by the gas, thereby ensuring the effect of reducing the amount of electrolyte sprayed from the injection hole 211.

[0037] In the two adjacent second blocking members 232, one end of one of the second blocking members 232 is connected to the first portion, and the other end of one of the second blocking members 232 is spaced apart from the second portion, and one end of the other second blocking member 232 is connected to the second portion, and the other end of the other second blocking member 232 is spaced apart from the first portion. In some embodiments, please refer to Figure 4 and Figure 5 , Figure 4 yes Figure 3 A top view of Figure 5 yes Figure 4 In the cross-sectional view of FIG, the other end of one second barrier 232 overlaps with the other end of the other second barrier 232 in the thickness direction of the cover plate 210.

[0038] In this embodiment, by overlapping the other end of one second barrier member 232 with the other end of another second barrier member 232 in the thickness direction of the cover plate 210, the orthographic projections of the corresponding other ends of the two adjacent second barrier members 232 in the length direction of the cover plate 210 will overlap, that is, there will be no gap between the ends of the two that are close to each other, thereby avoiding the problem that part of the electrolyte carried by the gas directly flows out of the injection hole 211 through the gap, resulting in the failure of the barrier effect of the second barrier member 232.

[0039] In some embodiments, if the number of second barriers 232 is N, the N second barriers 232 are arranged in a direction from the bottom of the cover plate 210 to the top of the cover plate 210, wherein the distance between the Mth second barrier 232 and the bottom end of the first barrier 231 is L1*M / (N+1), and M and N are positive integers, M is less than or equal to N, and L1 is the size of the first barrier 231 in the thickness direction of the cover plate 210.

[0040] In this embodiment, the height difference between two adjacent second barriers 232 in the thickness direction of the cover plate 210 is designed in the above manner. It is easy to understand that, when the length of the first barrier 231 is constant, an excessively large height difference results in a smaller number of second barriers 232 that can be placed, resulting in fewer layers of second barriers 232 for the electrolyte carried by the gas to pass through, and thus a poorer electrolyte blocking effect. On the other hand, an excessively small height difference results in a higher gas flow rate during the evacuation process, making it less likely that the electrolyte carried by the gas will be blocked by the second barriers 232, and increasing the risk of the electrolyte carried by the gas being ejected from the injection hole 211 along with the gas. Experimental data shows that when the distance between the bottom end of the Mth second barrier 232 and the first barrier 231 is M / (N+1)*L1, the amount of electrolyte carried by the gas flowing out of the injection hole 211 is minimized, i.e., under this condition, the second barrier 232 achieves the best blocking effect.

[0041] When the upper and lower surfaces of the second barrier 232 are fan-shaped, the blocking effect of the second barrier 232 is better. On this basis, in order to further enhance the blocking effect of the second barrier 232, in some embodiments, please refer to Figure 4 , 1 / 2*D≤L2≤2 / 3*D, wherein D is the diameter of the injection hole 211, and L2 is the maximum distance between the other end of the second barrier 232 and the connected first part or second part.

[0042] Specifically, when L2 is greater than 2 / 3*D, that is, the gap between the second barrier 232 and the inner sidewall is small, resulting in a higher gas flow rate during the pumping process, thereby increasing the risk of electrolyte carried by the gas flowing out of the injection hole 211 along with the gas. When L2 is less than 1 / 2*D, a gap will exist between the corresponding other ends of two adjacent second barriers 232 projected along the length direction of the cover plate 210, allowing some electrolyte carried by the gas to flow directly out of the injection hole 211 through this gap, resulting in the problem of the barrier function of the second barrier 232 being ineffective.

[0043] In some embodiments, please refer to Figure 4 and Figure 5, the connecting member 220 is arranged around the injection hole 211, and the first blocking member 231 is arranged between the corresponding two adjacent connecting members 220, 5≥D2 / D1≥2, 4 / 5≥L1 / L3≥2 / 3, wherein D1 is the arc length of the outer arc edge of the orthographic projection pattern of the connecting member 220 on the cover plate 210, D2 is the arc length of the outer arc edge of the orthographic projection pattern of the first blocking member 231 on the cover plate 210, L1 is the size of the first blocking member 231 in the thickness direction of the cover plate 210, and L3 is the size of the connecting member 220 in the thickness direction of the cover plate 210.

[0044] Specifically, when D2 / D1 < 2 and / or L1 / L3 > 4 / 5, the area of ​​the connection hole 240 between two adjacent connectors 220 is small, resulting in low air extraction efficiency. When D2 / D1 > 5 and / or L1 / L3 < 2 / 3, the area of ​​the connection hole 240 between two adjacent connectors 220 is large, resulting in a large volume of gas entering the injection hole 211 per unit time, thereby affecting the barrier effect of the second barrier 232. When 5 ≥ D2 / D1 ≥ 2 and 4 / 5 ≥ L1 / L3 ≥ 2 / 3, the barrier effect of the second barrier 232 is optimal.

[0045] In some embodiments, the battery 100 cover 210 further includes a bottom plate 400 disposed opposite to the injection hole 211 (see Figure 2 ), a plurality of connectors 220 are connected between the bottom plate 400 and the cover plate 210. Preferably, the first barrier member, the second barrier member and the connector are integrally formed.

[0046] Because the electrolyte flows at a high rate during the battery 100 filling process, in this embodiment, a base plate 400 is positioned relative to the filling port 211. This provides a buffer for the electrolyte during the filling process, preventing the electrolyte from directly impacting the interior of the battery and causing damage. The first barrier 231, the second barrier 232, and the connector 220 are designed to be integrally formed. Compared to attaching the second barrier 232 to the first barrier 231 and connector 220 through welding or other methods, this structure avoids the cracks that may be caused by welding, resulting in greater strength and durability. Furthermore, this integral molding reduces the number of steps and manual labor required during the production process, thereby improving production efficiency.

[0047] The present utility model provides a battery top cover and a battery 100, wherein the battery top cover includes a cover plate 210 provided with a liquid injection hole 211, a plurality of connectors 220 connected to the cover plate 210 and surrounding the liquid injection hole 211, and a blocking assembly, a connecting hole 240 is provided between every two adjacent connectors 220, and the blocking assembly includes a first blocking member 231 and a second blocking member 232, the first blocking member 231 is provided between the corresponding two adjacent connectors 220 and blocks part of the connecting hole 240, the second blocking member 232 is connected to the inner side wall of the plurality of connectors 220 close to the axis of the liquid injection hole 211, and has a gap between the inner side wall, and the connecting hole 240 is connected to the liquid injection hole 211 through the gap. The present invention provides a connector 220 and a blocking assembly on the side of the injection hole 211 of the cover plate 210 close to the battery housing 300, so that when the gas inside the battery flows out of the injection hole 211, the electrolyte carried by the gas is blocked by the first blocking member 231 in the blocking assembly, so that part of the electrolyte carried by the gas will not be drawn out due to the effect of gravity and will continue to remain in the battery. When part of the electrolyte carried by the gas enters the injection hole 211, another part of the electrolyte will not flow out of the injection hole 211 due to the blocking of the second blocking member 232 in the blocking assembly and under the influence of its own gravity, thereby ultimately reducing the amount of electrolyte sprayed from the injection hole 211.

[0048] The present invention also provides a battery 100, which includes the battery cover described above. The battery 100 has all the advantages of the battery cover described above, which will not be described in detail here.

[0049] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery top cover, characterized in that: include: A cover plate, wherein a liquid injection hole is provided along the thickness direction of the cover plate; a plurality of connecting members connected to the bottom of the cover plate and surrounding the liquid injection hole, with a connecting hole being provided between every two adjacent connecting members; and blocking components; In which, the blocking assembly includes a first blocking member and a second blocking member, the first blocking member is arranged between the corresponding two adjacent connecting members and blocks part of the connecting hole, the second blocking member is connected to the inner side wall of multiple connecting members close to the axis of the injection hole, and has a gap between the inner side wall, and the connecting hole is connected to the injection hole through the gap.

2. The battery top cover according to claim 1, characterized in that: The first blocking member is connected to the bottom of the cover plate, and the bottom of the gap is higher than the bottom end of the first blocking member away from the cover plate.

3. The battery top cover according to claim 1, characterized in that: There are multiple second blocking members, and the multiple second blocking members are arranged on the first blocking member along the thickness direction of the cover plate.

4. The battery top cover according to claim 3, characterized in that: The inner side walls of the plurality of first barriers and the plurality of connecting members include relative first and second parts; among two adjacent second barriers, one end of one of the second barriers is connected to the first part, and the other end of one of the second barriers is spaced apart from the second part, one end of another second barrier is connected to the second part, and the other end of another second barrier is spaced apart from the first part.

5. The battery top cover according to claim 4, characterized in that: The other end of one of the second blocking members overlaps with the other end of the other second blocking member in a thickness direction of the cover plate.

6. The battery top cover according to claim 5, characterized in that: The number of the second blocking members is N, and the N second blocking members are arranged in a direction from the bottom of the cover plate to the top of the cover plate. The distance between the bottom end of the Mth second blocking member and the first blocking member is L1*M / (N+1), where M and N are positive integers, M is less than or equal to N, and L1 is the size of the first blocking member in the thickness direction of the cover plate.

7. The battery top cover according to claim 5, characterized in that: 1 / 2*D≤L2≤2 / 3*D; wherein, L2 is the maximum distance between the other end of the second barrier and the connected first part or the second part, and D is the diameter of the injection hole.

8. The battery top cover according to any one of claims 1 to 7, characterized in that: 5≥D2 / D1≥2, 4 / 5≥L1 / L3≥2 / 3; wherein, D1 is the arc length of the outer arc edge of the orthographic projection pattern of the connecting member on the cover plate, D2 is the arc length of the outer arc edge of the orthographic projection pattern of the first blocking member on the cover plate, L1 is the dimension of the first blocking member in the thickness direction of the cover plate, and L3 is the dimension of the connecting member in the thickness direction of the cover plate.

9. The battery top cover according to any one of claims 1 to 7, characterized in that: It also includes a bottom plate arranged opposite to the liquid injection hole, and a plurality of connecting members are connected between the bottom plate and the cover plate; And / or, the first barrier member, the second barrier member and the connecting member are integrally formed.

10. A battery, characterized in that: The battery top cover comprises the battery top cover according to any one of claims 1 to 9.

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