Battery top cover, battery and electric equipment

Abstract

The embodiment of the utility model provides a battery top cover, a battery and electric equipment, and relates to the technical field of energy storage. The battery top cover comprises a cover plate and a pole arranged on the cover plate, the pole is provided with at least two liquid injection holes, and the two ends of the at least two liquid injection holes are located on the two sides of the cover plate respectively in the thickness direction of the cover plate. By means of the at least two liquid injection holes, injection and air exhaust can be separated, a circulation channel allowing electrolyte to enter and internal air to be exhausted is formed, and the liquid injection efficiency is improved. In addition, the number of holes of the battery is reduced, and the sealing reliability is better.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of energy storage, and in particular, to a battery top cover, a battery, and an electrical device. Background Art

[0002] With the rapid development of the economy and technology, the application of power batteries is becoming more and more extensive. A power battery is a power source that provides power for electrical devices such as electric vehicles, electric trains, electric bicycles, and golf carts.

[0003] A power battery generally includes battery cells, a housing for accommodating the battery cells, and a battery top cover sealed and installed on the housing. The housing usually contains electrolyte. In order to facilitate the injection of the electrolyte into the housing, an additional liquid injection hole is provided on the housing or the battery top cover. After the electrolyte injection is completed, the liquid injection hole is sealed.

[0004] However, the existing liquid injection holes usually used in batteries cannot take into account both the liquid injection efficiency and the battery sealing performance. Utility Model Content

[0005] The embodiments of the present application provide a battery top cover, a battery, and an electrical device, which are used to improve the liquid injection efficiency of the battery and ensure the sealing performance of the battery.

[0006] The embodiments of the present application provide the following technical solutions:

[0007] In a first aspect of the embodiments of the present application, a battery top cover is provided, including a cover plate and a pole column provided on the cover plate. The pole column has at least two liquid injection holes, and along the thickness direction of the cover plate, both ends of the at least two liquid injection holes are respectively located on both sides of the cover plate.

[0008] In a possible implementation manner, along the thickness direction of the cover plate, the first ends of the at least two liquid injection holes are located at the first end of the pole column, and the second ends of the at least two liquid injection holes are located on the outer peripheral surface of the second end of the pole column.

[0009] In a possible implementation manner, along the thickness direction of the cover plate, the first ends of the at least two liquid injection holes are located at the first end of the pole column, and the second ends of the at least two liquid injection holes are located at the second end of the pole column.

[0010] In a possible implementation manner, the battery top cover further includes a partition plate, and the partition plate is provided at the second end of the pole column and is located between the second ends of two adjacent liquid injection holes.

[0011] In a possible implementation manner, the battery top cover further includes a bottom plate and at least two side plates;

[0012] Two of the side plates are respectively arranged on two opposite sides of the partition along a first direction, the bottom plate is arranged at one end of the side plates and the partition away from the cover plate, and the first direction intersects with the thickness direction of the cover plate.

[0013] In a possible implementation manner, a plurality of through holes arranged at intervals are provided on a part of the bottom plate on one side of the partition.

[0014] In a possible implementation manner, the battery top cover further includes a seal and a spacer;

[0015] The seal is arranged between the pole post and the cover plate and abuts against both the pole post and the cover plate;

[0016] Along the thickness direction of the cover plate, the spacer is located on a first side of the cover plate, the spacer is sleeved on the pole post and at least abuts against the pole post.

[0017] In a possible implementation manner, along the thickness direction of the cover plate, one end of the pole post has a first outer edge, the first outer edge is located on a second side of the cover plate and abuts against the cover plate.

[0018] In a possible implementation manner, one end of the pole post away from the first outer edge has a second outer edge, the second outer edge is located on the first side of the cover plate and abuts against the spacer.

[0019] In a possible implementation manner, one end of the seal away from the first outer edge protrudes from the cover plate and abuts against the spacer.

[0020] In a possible implementation manner, a first groove is provided on a surface of the seal facing away from the first outer edge, and the spacer is located in the first groove;

[0021] And / or, a second groove is provided on a surface of the spacer away from the first outer edge, and the second outer edge is located in the second groove.

[0022] In a possible implementation manner, the battery top cover further includes a liquid injection hole flat plate, the liquid injection hole flat plate is located on the first side of the cover plate and seals the liquid injection hole.

[0023] In a possible implementation manner, there are at least two liquid injection hole flat plates, one liquid injection hole flat plate is correspondingly arranged in each liquid injection hole, and the liquid injection hole flat plate is fixedly connected to the pole post.

[0024] In a possible implementation manner, there is one liquid injection hole flat plate, and one liquid injection hole flat plate covers the at least two liquid injection holes.

[0025] In a possible implementation, a third groove is provided on the corresponding surface of the terminal post, at least two liquid injection holes are provided on the bottom wall of the third groove, a liquid injection hole flat plate is arranged in the third groove, and the liquid injection hole flat plate is fixedly connected to the third groove in the circumferential direction;

[0026] Alternatively, the surface of the spacer away from the seal protrudes from the terminal post, and the liquid injection hole flat plate is fixedly connected to the spacer in the circumferential direction.

[0027] A second aspect of the embodiments of the present application provides a battery, including: a housing, an electric core, and the battery top cover as described above;

[0028] The housing has a receiving cavity and an opening communicating with the receiving cavity, the electric core is arranged in the receiving cavity, and the battery top cover is buckled on the opening;

[0029] The terminal post of the battery top cover is electrically connected to the electric core.

[0030] A third aspect of the embodiments of the present application provides an electrical device, including the battery as described above.

[0031] In the battery top cover, battery, and electrical device provided by the embodiments of the present application, the battery top cover includes a cover plate and a terminal post arranged on the cover plate. The terminal post has at least two liquid injection holes. Along the thickness direction of the cover plate, both ends of the at least two liquid injection holes are respectively located on both sides of the cover plate. By using the at least two liquid injection holes, the injection and air extraction can be separated, forming a circulation channel for the electrolyte to enter and the internal air to be discharged, improving the liquid injection efficiency. At the same time, the openings of the battery are reduced, and the sealing reliability is better.

[0032] In addition to the technical problems solved by the embodiments of the present application, the technical features constituting the technical solutions, and the beneficial effects brought by the technical features of these technical solutions described above, the other technical problems that can be solved by the battery top cover, battery, and electrical device provided by the embodiments of the present application, the other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manners. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the 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, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic diagram of the battery provided by the embodiments of the present application;

[0035] Figure 2 Front view of the battery top cover and the battery cell provided by the embodiment of the present application;

[0036] Figure 3 Side view of the battery top cover and the battery cell provided by the embodiment of the present application;

[0037] Figure 4 Stereogram of the battery top cover and the battery cell provided by the embodiment of the present application;

[0038] Figure 5 Cross-sectional view of the battery top cover and the housing provided by the embodiment of the present application;

[0039] Figure 6 Exploded view of the battery top cover provided by the embodiment of the present application;

[0040] Figure 7 Schematic diagram of liquid inlet and exhaust of the battery top cover provided by the embodiment of the present application;

[0041] Figure 8 Top view of the battery top cover provided by the embodiment of the present application;

[0042] Figure 9 Schematic diagram of a kind of liquid injection hole provided by the embodiment of the present application;

[0043] Figure 10 Schematic diagram of the partition board, the side plate and the bottom plate provided by the embodiment of the present application;

[0044] Figure 11 Cross-sectional view of the partition board, the side plate and the bottom plate provided by the embodiment of the present application;

[0045] Figure 12 Cross-sectional view of the battery top cover provided by the embodiment of the present application;

[0046] Figure 13 Stereogram of a kind of structure of the liquid injection hole flat sheet provided by the embodiment of the present application;

[0047] Figure 14 Cross-sectional view of a kind of structure of the liquid injection hole flat sheet provided by the embodiment of the present application;

[0048] Figure 15 Stereogram of another kind of structure of the liquid injection hole flat sheet provided by the embodiment of the present application;

[0049] Figure 16 Cross-sectional view of another kind of structure of the liquid injection hole flat sheet provided by the embodiment of the present application.

[0050] Explanation of reference numerals:

[0051] 10 - Housing; 20 - Cover plate;

[0052] 21 - Surface layer; 22 - Insulating layer;

[0053] 30 - Terminal post; 31 - Liquid injection hole;

[0054] 32 - First outer edge; 33 - Second outer edge;

[0055] 34 - Extension part; 40 - Seal;

[0056] 41 - First groove; 50 - Spacer block;

[0057] 51 - Second groove; 60 - Liquid injection hole flat sheet;

[0058] 70 - Battery cell; 71 - Tab;

[0059] 81 - Separator; 82 - Side plate;

[0060] 83 - Bottom plate; 84 - Cross beam;

[0061] 85 - Through hole. Detailed implementation mode

[0062] As in the background art, the battery adopts a single liquid injection hole, which is usually arranged on the battery top cover or the housing. When injecting liquid, negative pressure is pumped from the liquid injection hole, and then electrolyte is injected from the liquid injection hole. This liquid injection hole serves as both a channel for the electrolyte to enter and a channel for the internal air to rise, seriously affecting the speed of the electrolyte entering.

[0063] For batteries with a high liquid injection coefficient, such as aluminum shell batteries or batteries with large single-cell battery cells (including long-knife batteries, square-knife batteries, etc.), liquid injection usually takes at least 40 - 60 minutes or even longer. The liquid injection coefficient is low, and multiple liquid injections are required to ensure sufficient liquid injection volume. The liquid injection rhythm is slow, increasing the production cycle and product backlog. Among them, the liquid injection coefficient refers to the ratio of the capacity of the battery to the mass of the injected liquid, with the unit of g / Ah.

[0064] The battery adopts a double liquid injection hole. Usually, on the basis of the traditional single liquid injection hole, an additional liquid injection hole is directly machined on the housing or the battery top cover, resulting in more openings on the battery, and the seal is likely to fail, which is not conducive to the safety design requirements of the battery. In addition, a terminal post hole usually needs to be opened on the battery. The terminal post hole and the liquid injection hole are separated, and both need to be sealed, so that the battery needs to be sealed at least in four places (two terminal posts, two liquid injection holes), increasing the risk points of seal failure and the seal cost. The seal cost is high, and the seal reliability is poor.

[0065] In view of the above technical problems, embodiments of the present application provide a battery top cover, a battery, and an electrical device. The cover plate is provided with a pole column, and the pole column has at least two liquid injection holes. Along the thickness direction of the cover plate, both ends of the at least two liquid injection holes are respectively located on both sides of the cover plate. By using the at least two liquid injection holes, the injection and air extraction can be separated to form a circulation channel for electrolyte entry and internal air discharge, improving the liquid injection efficiency. At the same time, the number of openings in the battery is reduced, and the sealing reliability is better.

[0066] In order to make the above objects, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0067] Embodiments of the present application provide an electrical device, which can be an electric bicycle, a battery car, an electric vehicle, a golf cart, an electric aircraft, an electric ship, an electric toy car, an electric toy ship, an electric toy aircraft, etc., and can also be a television, an electronic watch, an e-book, a desktop computer, a laptop computer, a tablet computer, a mobile phone, an AR device (Augmented Reality, augmented reality) or a VR device (Virtual Reality, virtual reality), etc. The present application does not make specific limitations on this. The electrical device includes a battery, and the battery refers to a device that can convert chemical energy into electrical energy and provides electrical energy for the electrical device. The battery can be a blade battery, an aluminum shell battery, etc.

[0068] Referring to Figures 1 to 16 , the battery includes a housing 10, a battery cell 70, and a battery top cover. Among them, the material of the housing 10 can be an insulating material. The housing 10 has a receiving cavity and an opening communicating with the receiving cavity. For example, the housing 10 has two openings respectively provided on both sides of the receiving cavity, that is, the openings on both sides of the housing 10.

[0069] The battery cell 70 is disposed in the receiving cavity for storing and releasing electrical energy. The battery cell 70 includes a positive electrode plate, a negative electrode plate, and a tab 71 for external connection. The battery top cover is buckled on the opening and is hermetically connected to the housing 10 to inject electrolyte. The battery top cover is also electrically connected to the battery cell 70. For example, the battery top cover is electrically connected to the tab 71.

[0070] As Figures 1 to 4 shown, the battery top cover includes a cover plate 20 and a pole column 30. The cover plate 20 includes a surface layer 21 and an insulating layer 22 provided on one side of the surface layer 21. The material of the surface layer 21 can be metal. The insulating layer 22 and the surface layer 21 are stacked along the thickness direction of the cover plate 20. The thickness direction of the cover plate 20 is asFigure 2 The vertical direction (Z direction) shown. Among them, the insulating layer 22 can be cylindrical, and its opening faces away from the surface layer 21.

[0071] The cover plate 20 is also provided with a pole hole, and the pole hole penetrates through the cover plate 20 along the thickness direction of the cover plate 20. A pole 30 is arranged in the pole hole, and the pole 30 is used to connect with the tab 71 of the battery cell 70 to externally connect the battery cell 70. Among them, along the thickness direction of the cover plate 20, both ends of the pole 30 extend out of both sides of the cover plate 20 respectively. In this way, one end of the pole 30 extends out of the side of the cover plate 20 adjacent to the battery cell 70 to facilitate the connection between the pole 30 and the battery cell 70 of the battery cell 70, and the other end of the pole 30 extends out of the side of the cover plate 20 away from the battery cell 70 to facilitate the formation of a step of the pole 30 relative to the cover plate 20 for facilitating liquid injection.

[0072] In some possible implementation manners, such as Figure 4 shown, one end of the pole 30 adjacent to the battery cell 70 has an extension portion 34 extending in a direction away from the pole hole. The extension portion 34 is in contact with the insulating layer 22. For example, the extension portion 34, the insulating layer 22, and the surface layer 21 are arranged in sequence, and the extension portion 34 is electrically connected to the tab 71 of the battery cell 70. For example, the side of the extension portion 34 facing away from the insulating layer 22 is electrically connected to the tab 71 by welding, and the current conduction path is as Figure 2 shown.

[0073] Referring to Figure 1 , Figure 5 and Figure 6 , the pole 30 has at least two liquid injection holes 31. Along the thickness direction of the cover plate 20, both ends of the at least two liquid injection holes 31 are located on both sides of the cover plate 20 respectively. In this way, along the thickness direction of the cover plate 20, each liquid injection hole 31 can communicate both sides of the cover plate 20. Referring to Figure 7 , during liquid injection, positive pressure liquid injection can be carried out from one of the liquid injection holes 31, and negative pressure air extraction can be carried out from the other liquid injection hole 31 to form a circulation channel for electrolyte entry and battery internal air discharge, improving the liquid injection efficiency.

[0074] For large single-cell batteries, such as long blade batteries, the liquid injection volume is large, and the liquid injection rhythm of the battery will no longer be a bottleneck, ensuring that the liquid injection time is completed within 30 minutes. And due to the formation of the channel, it is beneficial to the flow of the electrolyte inside the battery, and the electrolyte can quickly enter the gaps between the positive and negative electrode plates, reducing the soaking time in the subsequent process. In addition, with the improvement of the liquid injection efficiency, the liquid injection coefficient design of the battery can be further improved, ensuring that there is sufficient electrolyte throughout the life cycle of the battery, avoiding battery capacity attenuation caused by electrolyte decomposition, and improving the life performance of the battery.

[0075] At least two liquid injection holes 31 are all arranged on the terminal post 30, the openings of the housing 10 and / or the battery top cover are reduced, and the strength and sealing reliability of the housing 10 and / or the battery top cover are better. Moreover, the liquid injection hole flat sheet 60 for plugging the liquid injection hole 31 is arranged on the terminal post 30, and the total thickness of the terminal post 30 and the liquid injection hole flat sheet 60 is greater. Compared with the case where the liquid injection hole 31 is arranged on the housing 10 and / or the battery top cover, the manufacturability and process yield are higher. At the same time, the battery top cover also has good compatibility and can be directly compatible with existing batteries without major modifications to the production line.

[0076] Among them, the length of the terminal post 30 is 5 mm - 80 mm, and the width of the terminal post 30 is 3 mm - 30 mm. For example, the length of the terminal post 30 is 20 mm, 50 mm or 60 mm, and the width of the terminal post 30 is 10 mm, 20 mm, etc. The length direction of the terminal post 30 is Figure 8 the X direction shown, and the width direction of the terminal post 30 is Figure 8 the Y direction shown, and the height direction of the terminal post 30 is consistent with the thickness direction of the cover plate 20.

[0077] The terminal post 30 is provided with two liquid injection holes 31, which is convenient to implement, and the two liquid injection holes 31 are arranged at intervals along the length direction of the terminal post 30. To ensure the liquid injection effect, the size of the liquid injection hole 31 is 1 - 14 mm, and the sizes of the two liquid injection holes 31 can be equal. For example, the liquid injection hole 31 is a round hole, and the size of the liquid injection hole 31 is the diameter of the liquid injection hole 31. Along the length direction of the terminal post 30, the distance between the two liquid injection holes 31 is greater than or equal to 2 mm.

[0078] In some possible embodiments, refer to Figure 9 , along the thickness direction of the cover plate 20, the first ends of at least two liquid injection holes 31 are located at the first end of the terminal post 30, and the second ends of at least two liquid injection holes 31 are located on the outer peripheral surface of the second end of the terminal post 30. The second end of the terminal post 30 is opposite to the first end of the terminal post 30. In this way, the first ends of at least two liquid injection holes 31 are located at the first end of the terminal post 30, the second ends of at least two liquid injection holes 31 are located on the outer peripheral surface of the terminal post 30, and are far from the first end of the terminal post 30. Among them, the first ends of at least two liquid injection holes 31 and the first end of the terminal post 30 are the ends far from the battery cell 70, such as Figure 9 the upper end shown. The second ends of at least two liquid injection holes 31 and the second end of the terminal post 30 are the ends close to the battery cell 70, such as Figure 9 the lower end shown.

[0079] By positioning the first ends of at least two liquid injection holes 31 at the first end of the terminal post 30, it facilitates liquid injection and air exhaust. The second ends of the at least two liquid injection holes 31 are located on the outer peripheral surface of the terminal post 30 and adjacent to the second end of the terminal post 30, facilitating the second ends of the at least two liquid injection holes 31 to be away from each other. Exemplarily, the openings of the second ends of two adjacent liquid injection holes 31 face crosswise, that is, there is a certain angle between the openings of the second ends of two adjacent liquid injection holes 31. For example, the openings of the two liquid injection holes 31 face away from each other (see Figure 9 shown). In this way, it can be avoided that the second ends of the liquid injection holes 31 are relatively close to each other, so that it can be avoided that the electrolyte is just drawn away by the adjacent liquid injection hole 31 as soon as it enters from one liquid injection hole 31.

[0080] In some other possible embodiments, referring to Figure 10 and Figure 11 , the first ends of the at least two liquid injection holes 31 are located at the first end of the terminal post 30, and the second ends of the at least two liquid injection holes 31 are located at the second end of the terminal post 30. Exemplarily, each liquid injection hole 31 is a straight hole, the first ends of each liquid injection hole 31 are located on the same surface, and the second ends of each liquid injection hole 31 are located on the same surface.

[0081] In the above embodiments, in order to ensure that the electrolyte is not just drawn away by the adjacent liquid injection hole 31 as soon as it enters from one liquid injection hole 31, in some possible implementation manners, the battery top cover further includes a partition plate 81. The partition plate 81 is disposed at the second end of the terminal post 30 and between the second ends of two adjacent liquid injection holes 31. Among them, the material of the partition plate 81 can be an insulating material. By providing the partition plate 81, the second ends of two adjacent liquid injection holes 31 can be separated to ensure that one liquid injection hole 31 injects electrolyte and the other liquid injection hole 31 exhausts air under negative pressure.

[0082] Among them, the battery top cover further includes a bottom plate 83 and at least two side plates 82. Two of the side plates 82 are respectively disposed on opposite sides of the partition plate 81 along a first direction, and the bottom plate 83 is disposed at the ends of the side plates 82 and the partition plate 81 away from the cover plate 20. The first direction intersects with the thickness direction of the cover plate 20, and the first direction can be the width direction of the terminal post 30 ( Figure 11 shown as the Y direction). The two side plates 82 can also be in contact with the terminal post 30, which can further define the flow direction of the electrolyte and / or the internal air.

[0083] In some possible examples, along a second direction, one end of the partition plate 81 and the two side plates 82 are aligned. The second direction intersects with both the first direction and the thickness direction of the cover plate 20, and the second direction can be the length direction of the terminal post 30. In this way, the partition plate 81 and the corresponding side plate 82 semi-surround a liquid injection hole 31, thereby separating this liquid injection hole 31 from the adjacent liquid injection hole 31.

[0084] In some other possible examples, along the second direction, both ends of the two side plates 82 extend outside the partition plate 81. The partition plate 81 and the corresponding side plates 82 enclose two regions, which are respectively located on both sides of the partition plate 81. The partition plate 81 can also be connected to the side plates 82 on both sides of it. For example, the partition plate 81 and the side plates 82 on both sides of it are of an integral structure, and the partition plate 81 and the connected side plates 82 are in an I-shaped configuration.

[0085] To increase the stability of the side plates 82, a cross beam 84 is also connected between the two side plates 82 on both sides of the partition plate 81. The cross beam 84 is located on the side of these two side plates 82 adjacent to the cover plate 20. Further, a cross beam 84 is respectively provided at the end portions of these two side plates 82 away from the partition plate 81, that is, there are two cross beams 84, and the two cross beams 84 are located on both sides of the partition plate 81 and away from the partition plate 81.

[0086] The bottom plate 83 can be connected to both the side plates 82 and the partition plate 81 to increase the stability of the bottom plate 83. The bottom plate 83 can be a flat plate. Along the second direction, the two ends of the bottom plate 83 can be respectively aligned with the two ends of the corresponding side plates 82. In some possible examples, a plurality of through holes 85 arranged at intervals are provided on a part of the bottom plate 83 on one side of the partition plate 81. The liquid injection hole 31 opposite to the through holes 85 is used for injecting electrolyte. In this way, the electrolyte can enter through the plurality of through holes 85, while ensuring the liquid injection efficiency, promoting the uniformity of electrolyte mixing.

[0087] Refer to Figure 1 、 Figure 2 and Figure 6 The battery top cover further includes a seal 40 and a spacer 50. The seal 40 is arranged between the pole post 30 and the cover plate 20 and abuts against both the pole post 30 and the cover plate 20. Along the thickness direction of the cover plate 20, the spacer 50 is located on the first side of the cover plate 20. The spacer 50 is sleeved on the pole post 30 and at least abuts against the pole post 30.

[0088] By arranging the seal 40 between the pole post 30 and the cover plate 20, the seal 40 abuts against the pole post 30 and abuts against the cover plate 20, so that the seal between the pole post 30 and the cover plate 20 can be achieved, that is, the seal of the pole post hole can be achieved, avoiding liquid leakage. Among them, the material of the seal 40 can be an insulating material. In this way, the seal 40 can also prevent the pole post 30 and the cover plate 20 from being connected, thus ensuring that the battery can work normally.

[0089] The spacer 50 is located on the first side of the cover plate 20. The first side of the cover plate 20 can be the side of the cover plate 20 away from the battery cell 70. That is, along the thickness direction of the cover plate 20, the spacer 50 and the battery cell 70 are respectively located on both sides of the cover plate 20. The spacer 50 is sleeved on the pole 30 and abuts against the pole 30. The spacer 50 also abuts against the cover plate 20 and / or the seal 40. On the one hand, the spacer 50 can be fixed, and on the other hand, the pole 30 can be led out by using the spacer 50. The material of the spacer 50 can be metal. In this way, an electric current path is formed between the spacer 50 and the pole 30.

[0090] In some possible implementation manners, along the thickness direction of the cover plate 20, one end of the pole 30 has a first outer edge 32. The first outer edge 32 is located on the second side of the cover plate 20 and abuts against the cover plate 20. The second side of the cover plate 20 can be the side of the cover plate 20 close to the battery cell 70. That is, along the thickness direction of the cover plate 20, the first outer edge 32 and the battery cell 70 are respectively located on the same side of the cover plate 20. The first outer edge 32 and the battery cell 70 can be connected. Exemplarily, the first outer edge 32 and the extension 34 are arranged in parallel and in contact. For example, the first outer edge 32 and the extension 34 are an integral structure to form an electric current path.

[0091] One end of the pole 30 away from the first outer edge 32 has a second outer edge 33. The second outer edge 33 is located on the first side of the cover plate 20 and abuts against the spacer 50. The second outer edge 33 can be formed by stamping. The thickness of the second outer edge 33 is greater than or equal to 1 mm, and the width of the second outer edge 33 is greater than or equal to 1 mm. The thickness of the second outer edge 33 is as Figure 12 shown by T1 in Figure 12 and the width of the second outer edge 33 is as shown by D in such that the sealing effect of the battery can be ensured.

[0092] Figure 6

[0093] One end of the seal 40 away from the first outer edge 32 protrudes from the cover plate 20 and abuts against the spacer 50. In this way, the seal 40 can be compressed between the spacer 50 and the cover plate 20 to ensure the sealing effect between the cover plate 20 and the pole 30. In some possible examples, as Figure 6 shown, a first groove 41 is provided on the surface of the seal 40 facing away from the first outer edge 32, and the spacer 50 is located in the first groove 41. By providing the first groove 41, it is convenient to position and limit the spacer 50 during assembly. Figure 12As shown, the height H of the terminal post 30 except for the first outer edge 32 is equal to the sum of the thickness T1 of the surface layer 21, the thickness (after compression) T2 of the insulating layer 22, the thickness (after compression) T3 of the seal 40, and the thickness T4 of the spacer 50.

[0094] The terminal post 30, the cover plate 20, the seal 40, and the spacer 50 can be assembled through the following process: Install the terminal post 30 from the first side of the cover plate 20, and press the first outer edge 32 of the terminal post 30 against the cover plate 20; Install the seal 40 and the spacer 50 on the terminal post 30 in sequence from the second side of the cover plate 20, and the seal 40 is located between the cover plate 20 and the terminal post 30; Stamp the terminal post 30 on the second side of the cover plate 20 to form a second outer edge 33 that abuts against the spacer 50, achieving the effect of stamping (riveting) for sealing and insulation. In this way, the material cost is relatively low. The stamping and stamping sealing processes of the incoming components of the terminal post 30 remain unchanged, and only the stamping die needs to be changed, without increasing the cost of this process.

[0095] The battery top cover further includes a liquid injection hole flat sheet 60, which is located on the first side of the cover plate 20 and plugs the liquid injection hole 31. In this way, after the liquid injection is completed, the liquid injection hole 31 is sealed to prevent the electrolyte from leaking. The liquid injection hole flat sheet 60 is in contact with the terminal post 30, and the liquid injection hole flat sheet 60 can also be welded to the connecting piece, and the connecting piece can be connected to the wire, thereby realizing the electrical connection and conduction function of the terminal post 30.

[0096] In some possible implementation manners, as Figure 1 shown, there are at least two liquid injection hole flat sheets 60, and one liquid injection hole flat sheet 60 is correspondingly arranged in each liquid injection hole 31, and the liquid injection hole flat sheet 60 is fixedly connected to the terminal post 30. For example, the corresponding liquid injection hole 31 and the liquid injection hole flat sheet 60 are adapted, and the liquid injection hole flat sheet 60 is welded in the corresponding liquid injection hole 31 to realize the sealing of each liquid injection hole 31.

[0097] In some other possible implementation manners, as Figures 13 to 16 shown, there is one liquid injection hole flat sheet 60, and one liquid injection hole flat sheet 60 covers at least two liquid injection holes 31. In this way, the liquid injection hole flat sheet 60 can be completed by one welding, reducing the number of welds and simplifying the connection process.

[0098] Exemplarily, as Figure 13 and Figure 14 shown, the corresponding surface of the terminal post 30 is provided with a third groove, at least two liquid injection holes 31 are provided on the bottom wall of the third groove, and a liquid injection hole flat sheet 60 is arranged in the third groove, and the liquid injection hole flat sheet 60 is fixedly connected to the third groove in the circumferential direction. In this way, the third groove can be used to position the liquid injection hole flat sheet 60 and facilitate the welding and fixing between the liquid injection hole flat sheet 60 and the side wall of the third groove.

[0099] Also exemplarily, as Figure 15 andFigure 16 As shown, the surface of the spacer 50 away from the seal 40 protrudes from the terminal post 30, and the liquid injection hole flat sheet 60 is circumferentially fixedly connected to the spacer 50. The liquid injection hole flat sheet 60 covers the corresponding surface of the terminal post 30 and is fixedly connected to the spacer 50 by circumferential welding. In this way, when the liquid injection hole flat sheet 60 is welded to the spacer 50, it will also be welded to the terminal post 30, making the liquid injection hole flat sheet 60, the terminal post 30 and the spacer 50 fixed to each other and improving the stability of their connection.

[0100] In summary, the battery top cover in the embodiment of the present application includes a cover plate 20 and a terminal post 30 provided on the cover plate 20. The terminal post 30 has at least two liquid injection holes 31. Along the thickness direction of the cover plate 20, both ends of the at least two liquid injection holes 31 are located on both sides of the cover plate 20 respectively. By using the at least two liquid injection holes 31, the injection and air extraction can be separated to form a circulation channel for the electrolyte to enter and the internal air to be discharged, improving the liquid injection efficiency. At the same time, the number of openings in the battery is reduced, and the sealing reliability is better.

[0101] The embodiments or implementation manners in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0102] It should be noted that the embodiments referred to as "one embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. in the specification may include specific features, structures or characteristics, but not necessarily each embodiment includes such specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when combining a specific feature, structure or characteristic with an embodiment, it is within the knowledge scope of those skilled in the art to implement such a feature, structure or characteristic in combination with other embodiments, whether explicitly or implicitly described.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit 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 described 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 top cover, characterized in that, Comprising: A cover plate (20), and a terminal post (30) provided on the cover plate (20), the terminal post (30) having at least two liquid injection holes (31), and along the thickness direction of the cover plate (20), both ends of the at least two liquid injection holes (31) are respectively located on both sides of the cover plate (20).

2. The battery top cover according to claim 1, wherein Along the thickness direction of the cover plate (20), the first ends of the at least two liquid injection holes (31) are located at the first end of the terminal post (30), and the second ends of the at least two liquid injection holes (31) are located on the outer peripheral surface of the second end of the terminal post (30).

3. The battery top cover according to claim 1, wherein Along the thickness direction of the cover plate (20), the first ends of the at least two liquid injection holes (31) are located at the first end of the terminal post (30), and the second ends of the at least two liquid injection holes (31) are located at the second end of the terminal post (30).

4. The battery top cover according to claim 3, characterized in that, The battery top cover further includes a partition plate (81), the partition plate (81) is provided at the second end of the terminal post (30), and is located between the second ends of two adjacent liquid injection holes (31).

5. The battery top cover according to claim 4, characterized in that The battery top cover further includes a bottom plate (83), and at least two side plates (82); Two of the side plates (82) are respectively provided on opposite sides of the partition plate (81) along a first direction, the bottom plate (83) is provided at one end of the side plates (82) and the partition plate (81) away from the cover plate (20), and the first direction intersects with the thickness direction of the cover plate (20).

6. The battery top cover according to claim 5, characterized in that, A plurality of through holes (85) arranged at intervals are provided on a part of the bottom plate (83) on one side of the partition plate (81).

7. The battery top cover according to any one of claims 1-5, characterized in that, The battery top cover further includes a seal (40) and a spacer (50); The seal (40) is provided between the terminal post (30) and the cover plate (20), and abuts against both the terminal post (30) and the cover plate (20); Along the thickness direction of the cover plate (20), the spacer (50) is located on the first side of the cover plate (20), the spacer (50) is sleeved on the terminal post (30) and at least abuts against the terminal post (30).

8. The battery top cover according to claim 7, characterized in that, Along the thickness direction of the cover plate (20), one end of the terminal post (30) has a first outer edge (32), the first outer edge (32) is located on the second side of the cover plate (20), and abuts against the cover plate (20).

9. The battery top cover according to claim 8, characterized in that, One end of the terminal post (30) away from the first outer edge (32) has a second outer edge (33), the second outer edge (33) is located on the first side of the cover plate (20), and abuts against the spacer (50).

10. The battery top cover according to claim 8, characterized in that, One end of the seal (40) away from the first outer edge (32) protrudes from the cover plate (20) and abuts against the spacer (50).

11. The battery top cover according to claim 9, characterized in that, A first groove (41) is provided on the surface of the seal (40) facing away from the first outer edge (32), and the spacer (50) is located in the first groove (41); And / or, a second groove (51) is provided on the surface of the spacer (50) away from the first outer edge (32), and the second outer edge (33) is located in the second groove (51).

12. The battery top cover according to claim 7, wherein, The battery top cover further includes a liquid injection hole flat sheet (60), which is located on the first side of the cover plate (20) and seals the liquid injection hole (31).

13. The battery top cover according to claim 12, characterized in that, There are at least two of the liquid injection hole flat sheets (60), and one liquid injection hole flat sheet (60) is correspondingly arranged in each liquid injection hole (31), and the liquid injection hole flat sheet (60) is fixedly connected to the pole column (30).

14. The battery top cover according to claim 12, characterized in that, There is one liquid injection hole flat sheet (60), and one liquid injection hole flat sheet (60) covers the at least two liquid injection holes (31).

15. The battery top cover according to claim 14, characterized in that, A third groove is provided on the corresponding surface of the pole column (30), the bottom wall of the third groove is provided with the at least two liquid injection holes (31), the liquid injection hole flat sheet (60) is arranged in the third groove, and the liquid injection hole flat sheet (60) is circumferentially fixedly connected to the third groove; Alternatively, the surface of the spacer block (50) away from the seal (40) protrudes from the pole column (30), and the liquid injection hole flat sheet (60) is circumferentially fixedly connected to the spacer block (50).

16. A battery, characterized in that, Comprising: A housing (10), an electric core, and the battery top cover according to any one of claims 1-15; The housing (10) has a receiving cavity and an opening communicating with the receiving cavity, the electric core is arranged in the receiving cavity, and the battery top cover is buckled on the opening; The pole column (30) of the battery top cover is electrically connected to the electric core.

17. An electrical device, characterized in that, Including the battery according to claim 16.

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