Battery top cover and battery

Abstract

This invention belongs to the field of battery manufacturing technology and discloses a battery top cover and a battery, including a top cover body, a conductive component, a sealing element, and a sealing ring. The top cover body has mounting holes. The conductive component includes terminals that pass through the mounting holes. Each terminal has an injection hole that extends through both ends of the terminal. The sealing element can seal the injection hole, and its length in a first direction is less than the length of the terminal in that first direction, which is parallel to the axial direction of the injection hole. The sealing ring is fitted over the terminal to seal the gap between the terminal and the mounting hole. After injection, the sealing element is used to seal the injection hole, and its length in the first direction is less than the length of the terminal in that first direction. This battery top cover, by providing injection holes on the terminals, not only avoids the sealing element occupying the battery cell's capacity, thus reducing the battery's size, but also prevents the sealing element from interfering with the electrode assembly, ensuring battery safety.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a battery top cover and a battery. Background Technology

[0002] In existing battery structures, the electrolyte filling hole is often located on the top cover of the battery, and it is also equipped with columnar sealing particles. After electrolyte filling is completed, the sealing particles are used to seal the filling hole to prevent electrolyte from flowing out of the battery cell. However, since the length of the sealing particles is greater than the thickness of the top cover, sealing the filling hole will occupy the capacity within the battery cell. Therefore, with a fixed amount of electrolyte injected into the battery cell, the height of the battery cell needs to be increased, resulting in an increase in battery volume. At the same time, the sealing particles also pose a risk of interfering with the battery electrode components, affecting battery safety. Summary of the Invention

[0003] The purpose of this invention is to provide a battery top cover and a battery that can reduce the battery size while ensuring the battery cell capacity and improving battery safety.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] The battery top cover includes:

[0006] A top cover body, wherein mounting holes are provided on the top cover body;

[0007] A conductive component, the conductive component including an electrode post, the electrode post passing through the mounting hole, the electrode post being provided with a liquid injection hole, the liquid injection hole passing through both ends of the electrode post;

[0008] A sealing element capable of sealing the injection hole, wherein the length of the sealing element in a first direction is less than the length of the electrode in the first direction, and the first direction is parallel to the axial direction of the injection hole;

[0009] A sealing ring is fitted over the pole post to seal the gap between the pole post and the mounting hole.

[0010] Optionally, the system also includes a baffle assembly, which includes a baffle and connectors. The baffle is spaced apart from the injection hole along the axial direction of the injection hole, and a plurality of connectors are spaced apart and supported between the edges of the baffle and the injection hole.

[0011] Optionally, the sealing element includes a first sealing portion and a second sealing portion connected together, the second sealing portion being located between the first sealing portion and the baffle, the bottom end of the second sealing portion protruding from the injection hole, and the second sealing portion being spaced apart from the connector.

[0012] Optionally, the cross-sectional dimension of the first sealing part along the radial direction of the injection hole is larger than the cross-sectional dimension of the second sealing part along the radial direction of the injection hole, and the corner of the bottom end of the second sealing part is chamfered.

[0013] Optionally, the bottom end of the second sealing portion abuts against the baffle.

[0014] Optionally, the baffle is provided with a flow guiding protrusion on the side facing the injection hole, and the bottom end of the second sealing part is spaced apart from or abuts against the flow guiding protrusion.

[0015] Optionally, the flow guide protrusion is coaxially arranged with the injection hole.

[0016] Optionally, it also includes a sealing sheet, wherein the electrode post is provided with a first liquid injection hole section and a second liquid injection hole section connected through it, the first liquid injection hole section is located on the side of the second liquid injection hole section opposite to the battery cell, the sealing sheet is housed in the first liquid injection hole section and is connected to the electrode post, and the sealing element is inserted into the second liquid injection hole section.

[0017] Optionally, the diameter of the first injection hole segment is larger than the diameter of the second injection hole segment; and / or, the diameter of the first injection hole segment gradually decreases in the direction toward the second injection hole segment.

[0018] Optionally, the sealing sheet and the pole are connected by welding, and a gap is provided between the sealing sheet and the sealing element.

[0019] Optionally, a guide groove is provided at one end of the electrode near the battery cell, the guide groove is connected to the liquid injection hole, the baffle assembly is located in the guide groove, and the connector is spaced apart from the groove wall of the guide groove.

[0020] Optionally, the guide groove includes a first groove segment and a second groove segment that are connected. The second groove segment is located on the side of the guide groove closer to the battery cell, and the first groove segment is located on the side of the guide groove away from the battery cell. The inner diameter of the second groove segment is larger than the inner diameter of the first groove segment.

[0021] Optionally, the conductive component further includes a terminal, which is disposed on the side of the top cover body away from the battery cell. The terminal is provided with a connection hole, and the electrode post passes through the connection hole. The surface of the electrode post is flush with the surface of the terminal. The battery top cover also includes a first insulating member, which is sandwiched between the terminal and the top cover body.

[0022] Optionally, a weld groove is formed at the connection between the pole and the terminal, and the pole and the terminal are connected by welding.

[0023] The battery includes a battery casing and the aforementioned battery top cover, wherein the battery top cover is disposed on the battery casing.

[0024] The beneficial effects of this invention are:

[0025] The battery top cover provided by this invention includes a top cover body, a conductive component, a sealing element, and a sealing ring. The terminals, passing through mounting holes on the top cover body, are used to extract the voltage from the battery and are an essential structure for the battery. During electrolyte filling, the electrolyte enters the battery cell through the filling holes on the terminals. After filling, the filling holes are sealed with the sealing element, and the length of the sealing element in a first direction is less than the length of the terminals in the first direction. By opening filling holes on the terminals, this battery top cover not only avoids the sealing element occupying the battery cell's capacity, thus reducing the battery's size, but also prevents the sealing element from interfering with the electrode components, ensuring battery safety.

[0026] The battery provided by the present invention includes a battery casing and the aforementioned battery top cover. The liquid injection hole is set on the terminal post, which avoids the sealing component occupying the capacity of the battery cell. While ensuring the capacity of the battery cell, the volume of the battery is reduced, and the sealing component is prevented from interfering with the battery electrode assembly, thereby improving the safety of the battery. Attached Figure Description

[0027] Figure 1 This is an exploded view of the battery top cover provided in an embodiment of the present invention;

[0028] Figure 2 This is a partial structural schematic diagram of the battery top cover provided in an embodiment of the present invention;

[0029] Figure 3 This is a cross-sectional view of the battery top cover provided in an embodiment of the present invention;

[0030] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0031] In the picture:

[0032] 1. Top cover body; 11. Mounting holes;

[0033] 2. Conductive component; 21. Terminal post; 211. Liquid injection hole; 212. Guide groove; 22. Terminal; 23. Solder groove;

[0034] 3. Baffle assembly; 31. Baffle; 32. Connector;

[0035] 41. Seal; 411. First sealing part; 412. Second sealing part; 42. Sealing plate;

[0036] 51. First insulating component; 52. Second insulating component; 521. Stop bar;

[0037] 6. Sealing ring. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] like Figures 1-4 As shown, this embodiment provides a battery top cover, including a top cover body 1, a conductive component 2, a sealing element 41, and a sealing ring 6. The top cover body 1 has a mounting hole 11. The conductive component 2 includes a terminal post 21, which passes through the mounting hole 11. The terminal post 21 has an injection hole 211, which extends through both ends of the terminal post 21. The sealing element 41 can seal the injection hole 211, and the length of the sealing element 41 in a first direction is less than the length of the terminal post 21 in the first direction, which is parallel to the axial direction of the injection hole 211. The sealing ring 6 is sleeved on the terminal post 21 to seal the gap between the terminal post 21 and the mounting hole 11, preventing electrolyte leakage from the gap and enhancing the sealing effect between the terminal post 21 and the top cover body 1.

[0043] The terminal post 21, passing through the mounting hole 11 on the top cover body 1, is used to extract the voltage from the battery and is an essential structure of the battery. During electrolyte filling, the electrolyte enters the battery cell through the filling hole 211 on the terminal post 21. After filling, the filling hole 211 is sealed with a sealing member 41, and the length of the sealing member 41 in the first direction is less than the length of the terminal post 21 in the first direction. By opening the filling hole 211 on the terminal post 21, the battery top cover not only avoids the sealing member 41 occupying the capacity of the battery cell, thus reducing the size of the battery, but also avoids the sealing member 41 interfering with the electrode assembly, ensuring battery safety. In this embodiment, the sealing ring 6 is made of rubber, providing a good sealing effect.

[0044] Furthermore, such as Figure 4 As shown, the battery top cover also includes a baffle assembly 3, which includes a baffle 31 and connectors 32. The baffle 31 is spaced apart from the injection hole 211 along its axial direction, and multiple connectors 32 are spaced apart and supported between the edges of the baffle 31 and the injection hole 211. During electrolyte injection, the electrolyte flows out of the injection hole 211 and impacts the baffle 31, then flows out through the gaps between the connectors 32 and enters the battery cell, thus avoiding impact on the battery cell during injection and protecting the separator of the battery cell. In this embodiment, the surface of the baffle 31 is perpendicular to the axial direction of the injection hole 211, which can effectively block the impact of the electrolyte. The connectors 32 are block-shaped and integrally formed with the baffle 31.

[0045] Furthermore, a flow-guiding protrusion is provided on the side of the baffle 31 facing the injection hole 211. During injection, the electrolyte flows out of the injection hole 211 and impacts the flow-guiding protrusion of the baffle 31, then falls onto the surface of the baffle 31 and flows out through the gaps between the multiple connectors 32, thus completing the injection. The electrolyte flows towards the surface of the baffle 31 through the flow-guiding protrusion. Compared to directly impacting the surface of the baffle 31, the kinetic energy of the electrolyte increases and the flow speed increases, further improving the battery's injection efficiency. In this embodiment, the flow-guiding protrusion is coaxially arranged with the injection hole 211, so that the electrolyte flowing out of the injection hole 211 can smoothly flow through the flow-guiding protrusion. For example, the flow-guiding protrusion can be a hemispherical, frustum, or conical structure.

[0046] Furthermore, all corners on the baffle 31 are chamfered, which makes the electrolyte flow more smoothly on the baffle 31 and increases the flow rate.

[0047] Furthermore, such as Figure 4As shown, the sealing element 41 includes a first sealing portion 411 and a second sealing portion 412 connected together. The second sealing portion 412 is located between the first sealing portion 411 and the baffle 31. The bottom end of the second sealing portion 412 protrudes from the injection hole 211, and the second sealing portion 412 is spaced apart from the connecting member 32. The first sealing portion 411 of the sealing element 41 can block the injection hole 211, and the spaced-apart arrangement of the second sealing portion 412 and the connecting member 32 makes it convenient and smooth to insert the sealing element 41 into the injection hole 211. In this embodiment, the cross-sectional dimension of the first sealing portion 411 along the radial direction of the injection hole 211 is larger than the cross-sectional dimension of the second sealing portion 412 along the radial direction of the injection hole 211, and the corner of the bottom end of the second sealing portion 412 is chamfered. Exemplarily, the sealing element 41 is a sealing granule.

[0048] Furthermore, the bottom end of the second sealing part 412 abuts against the baffle 31, making the sealing member 41 stable and preventing it from moving axially within the injection hole 211. In this embodiment, the bottom end of the second sealing part 412 abuts against the guide protrusion. In other embodiments, if the guide protrusion is not coaxial with the injection hole 211, the bottom end of the second sealing part 412 is spaced apart from the guide protrusion.

[0049] Furthermore, the battery top cover also includes a sealing sheet 42. The terminal post 21 has a first and a second liquid injection hole section connected through it, forming the aforementioned liquid injection hole 211. The first liquid injection hole section is located on the side of the second liquid injection hole section opposite to the battery cell. The sealing sheet 42 is housed in the first liquid injection hole section and connected to the terminal post 21. A sealing element 41 is inserted into the second liquid injection hole section. The sealing sheet 42 in the first liquid injection hole section and the sealing element 41 in the second liquid injection hole section provide double sealing for the liquid injection hole 211, preventing electrolyte leakage from the battery cell. During battery use, gas is generated inside the battery cell; the sealing sheet 42, sealing the outside of the sealing element 41, prevents the sealing element 41 from being ejected from the liquid injection hole 211 due to gas pressure. In this embodiment, the sealing sheet 42 is made of aluminum, which has good conductivity and can assist the terminal post 21 in conducting electricity.

[0050] Furthermore, the diameter of the first injection hole section is larger than that of the second injection hole section, which allows the electrolyte to flow more accurately into the injection hole 211 during injection. In this embodiment, the diameter of the first injection hole section gradually decreases in the direction toward the second injection hole section, which plays a guiding role.

[0051] Furthermore, such as Figure 4 As shown, the sealing sheet 42 and the pole post 21 are connected by welding. A gap is provided between the sealing sheet 42 and the sealing element 41 to accommodate some of the gas generated during the welding process and to prevent the sealing sheet 42 from being ejected from the injection hole 211.

[0052] Furthermore, such as Figures 2-4As shown, a guide groove 212 is provided at the end of the electrode post 21 near the battery cell. The guide groove 212 is connected to the injection hole 211. The baffle assembly 3 is located inside the guide groove 212, and the connector 32 is spaced apart from the wall of the guide groove 212. When the electrolyte flows out from the gaps between the multiple connectors 32, it flows along the wall of the guide groove 212, thereby allowing the electrolyte entering the battery cell to quickly collect and shorten the injection time.

[0053] Furthermore, the guide groove 212 includes a first groove segment and a second groove segment that are connected. The second groove segment is located on the side of the guide groove 212 closer to the battery cell, and the first groove segment is located on the side of the guide groove 212 away from the battery cell. The inner diameter of the second groove segment is larger than the inner diameter of the first groove segment, thereby enabling the battery weight to be reduced while increasing the battery capacity.

[0054] Furthermore, the conductive component 2 also includes a terminal 22, which is disposed on the side of the top cover body 1 away from the battery cell. The terminal 22 is provided with a connection hole, and the pole post 21 passes through the connection hole. The surface of the pole post 21 is flush with the surface of the terminal 22. The terminal 22 with a larger cross-sectional area serves as an electrical contact to connect the load to the battery, and assists the pole post 21 with a smaller cross-sectional area to output electrical energy.

[0055] Furthermore, the battery top cover also includes a first insulating member 51, which is sandwiched between the terminal 22 and the top cover body 1 to prevent the conductive top cover body 1 from contacting the terminal 22 and causing a short circuit in the battery. In this embodiment, the first insulating member 51 is provided with a groove, and the terminal 22 is accommodated in the groove, with only the top surface exposed for contacting the load. Exemplarily, the first insulating member 51 is made of plastic.

[0056] Furthermore, a weld groove 23 is formed at the connection between the pole post 21 and the terminal 22. The pole post 21 and the terminal 22 are connected by welding. The welding operation is carried out in the weld groove 23, which can compensate for the height of the protrusion generated by welding and avoid affecting the surface flatness of the terminal 22 and the pole post 21.

[0057] Furthermore, the battery top cover also includes a second insulating member 52, which is disposed on the side of the top cover body 1 near the battery cell. The second insulating member 52 has a second clearance hole, and a baffle 521 is disposed at the edge of the second clearance hole. The terminal post 21 includes a cylindrical portion and a protruding portion. The protruding portion is arranged circumferentially around the cylindrical portion. The cylindrical portion passes through the second clearance hole and the mounting hole 11, and the protruding portion passes through the second clearance hole and abuts against the baffle 521. The second insulating member 52 isolates the conductive top cover body 1 from the battery cell, preventing battery leakage. Simultaneously, the terminal post 21 abuts against the baffle 521 on the second insulating member 52, fixing the position of the terminal post 21 relative to the first insulating member 51 and the second insulating member 52. In this embodiment, a guide groove 212 is disposed on the cylindrical portion near the protruding portion, and the protruding portion resembles the flange of the cylindrical portion. Exemplarily, the second insulating member 52 is made of lower plastic.

[0058] This embodiment also provides a battery, including a battery casing and the aforementioned battery top cover, with the battery top cover covering the battery casing. The electrolyte injection hole 211 is positioned on the terminal post 21, preventing the seal 41 from occupying the battery cell's capacity. This reduces the battery's size while maintaining the battery cell's capacity, and also prevents the seal 41 from interfering with the battery electrode assembly, thus improving battery safety.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery top cover, characterized in that, include: Top cover body (1), the top cover body (1) is provided with mounting holes (11); The conductive component (2) includes a terminal post (21), which is inserted through the mounting hole (11). The terminal post (21) is provided with a liquid injection hole (211), which passes through both ends of the terminal post (21). Baffle assembly (3), the baffle assembly (3) includes a baffle (31) and connectors (32), the baffle (31) is spaced apart from the injection hole (211) along the axial direction of the injection hole (211), and a plurality of connectors (32) are spaced apart between the edge of the baffle (31) and the injection hole (211); A sealing element (41) is capable of sealing the injection hole (211), and the length of the sealing element (41) in a first direction is less than the length of the pole (21) in the first direction, the first direction being parallel to the axial direction of the injection hole (211); The sealing sheet (42) is provided with a first liquid injection hole section and a second liquid injection hole section connected through the electrode post (21). The first liquid injection hole section is located on the side of the second liquid injection hole section away from the battery cell. The sealing sheet (42) is housed in the first liquid injection hole section and is connected to the electrode post (21). The sealing member (41) is inserted into the second liquid injection hole section. A sealing ring (6) is fitted over the pole post (21) to seal the gap between the pole post (21) and the mounting hole (11).

2. The battery top cover according to claim 1, characterized in that, The sealing element (41) includes a first sealing part (411) and a second sealing part (412) connected together. The second sealing part (412) is located between the first sealing part (411) and the baffle (31). The bottom end of the second sealing part (412) protrudes from the injection hole (211), and the second sealing part (412) is spaced apart from the connector (32).

3. The battery top cover according to claim 2, characterized in that, The cross-sectional dimension of the first sealing part (411) along the radial direction of the injection hole (211) is greater than the cross-sectional dimension of the second sealing part (412) along the radial direction of the injection hole (211), and the corner of the bottom end of the second sealing part (412) is chamfered.

4. The battery top cover according to claim 2, characterized in that, The bottom end of the second sealing part (412) abuts against the baffle (31).

5. The battery top cover according to claim 2, characterized in that, The baffle (31) is provided with a flow guiding protrusion on the side facing the injection hole (211), and the bottom end of the second sealing part (412) is spaced apart from or abuts against the flow guiding protrusion.

6. The battery top cover according to claim 5, characterized in that, The flow guide protrusion is coaxially arranged with the injection hole (211).

7. The battery top cover according to claim 1, characterized in that, The diameter of the first injection orifice is larger than that of the second injection orifice; and / or, the diameter of the first injection orifice gradually decreases in the direction toward the second injection orifice.

8. The battery top cover according to claim 1, characterized in that, The sealing sheet (42) is connected to the pole post (21) by welding, and a gap is provided between the sealing sheet (42) and the sealing element (41).

9. The battery top cover according to any one of claims 1 to 6, characterized in that, The electrode post (21) is provided with a guide groove (212) at one end near the battery cell. The guide groove (212) is connected to the liquid injection hole (211). The baffle assembly (3) is located in the guide groove (212), and the connector (32) is spaced apart from the groove wall of the guide groove (212).

10. The battery top cover according to claim 9, characterized in that, The guide groove (212) includes a first groove segment and a second groove segment that are connected. The second groove segment is located on the side of the guide groove (212) closer to the battery cell, and the first groove segment is located on the side of the guide groove (212) away from the battery cell. The inner diameter of the second groove segment is larger than the inner diameter of the first groove segment.

11. The battery top cover according to any one of claims 1-6, characterized in that, The conductive component (2) further includes a terminal (22), which is disposed on the side of the top cover body (1) away from the battery cell. The terminal (22) is provided with a connection hole, and the pole post (21) passes through the connection hole. The surface of the pole post (21) is flush with the surface of the terminal (22). The battery top cover also includes a first insulating member (51), which is sandwiched between the terminal (22) and the top cover body (1).

12. The battery top cover according to claim 11, characterized in that, A weld groove (23) is formed at the connection between the pole (21) and the terminal (22), and the pole (21) and the terminal (22) are connected by welding.

13. A battery, comprising a battery casing and a battery top cover as claimed in any one of claims 1-12, characterized in that, The battery top cover is disposed on the battery casing.

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