Top cover assembly and battery

Abstract

The top cover assembly comprises a top cover piece and a lower insulating part, the top cover piece is provided with a liquid injection hole, the upper surface of the lower insulating part abuts against the top cover piece, the lower insulating part is provided with a liquid injection channel, and the liquid injection channel is communicated with the liquid injection hole; an inclined baffle and a plurality of arc-shaped baffles are arranged in the liquid injection channel, a gap is formed between every two adjacent arc-shaped baffles, and the inclined baffle is connected with the arc-shaped baffles and the inner wall of the liquid injection channel and inclines from the inner wall of the liquid injection channel to the axial direction of the liquid injection channel. The inclined baffle is arranged in the liquid injection channel, and a flow guide surface formed by the inclination angle of the inclined baffle can disperse a local pressure peak value, so that the mechanical stress concentration caused by high-pressure liquid injection is reduced, and the internal microstructure of the battery cell is protected.

Description

Technical Field

[0001] This utility model relates to the field of power batteries and energy storage batteries, and more specifically, to a top cover assembly and a battery. Background Technology

[0002] Lithium-ion batteries are widely used in power batteries, energy storage batteries, and other technological fields. Power batteries provide power for tools, typically powering electric vehicles, electric trains, electric bicycles, golf carts, and other similar vehicles, and are core components of new energy vehicles. Energy storage batteries are commonly used in home energy storage, power stations for solar and wind power generation equipment, portable power supplies, communication base stations, and as batteries for storing renewable energy. The two types of batteries have different application scenarios, and their performance and design differ.

[0003] In existing technologies, electrolyte is injected into the battery cell through injection holes on the top cover and the lower plastic plate. Conventional injection hole structures are simple, and during injection, the liquid flows directly along the direction of the injection hole, resulting in pressure that acts directly on the battery cell structure. Excessive injection pressure may force the positive / negative electrode separator to partially collapse or perforate, causing a micro-short circuit risk and leading to the battery cell being unusable or scrapped.

[0004] Therefore, there is an urgent need to provide a top cover assembly and battery to avoid the technical problem of excessive pressure during liquid injection causing the diaphragm to detach. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned defects in the existing technology and provide a top cover assembly, including:

[0006] Top cover plate, wherein the top cover plate is provided with a liquid injection hole;

[0007] The lower insulating component has an upper surface that abuts against the top cover plate, and the lower insulating component is provided with a liquid injection channel that communicates with the liquid injection hole;

[0008] The injection channel is provided with an inclined baffle and multiple arc-shaped baffles. There is a gap between adjacent arc-shaped baffles. The inclined baffle connects the arc-shaped baffle and the inner wall of the injection channel. The inclined baffle is inclined from the inner wall of the injection channel towards the axial direction of the injection channel.

[0009] This utility model also discloses a battery, including the aforementioned top cover assembly.

[0010] Implementing the embodiments of this utility model will have the following beneficial effects:

[0011] This invention features an inclined baffle in the injection channel. The inclined baffle forms a flow-guiding surface that can disperse local pressure peaks, reduce mechanical stress concentration caused by high-pressure injection, and protect the internal microstructure of the battery cell. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] in:

[0014] Figure 1 An axial view of the top cover assembly provided in an embodiment of this utility model;

[0015] Figure 2 for Figure 1 A cross-sectional view along line A-A' in the middle;

[0016] Figure 3 for Figure 1 Another cross-sectional view along the A-A' direction;

[0017] Figure 4 for Figure 1 Another cross-sectional view along the A-A' direction;

[0018] Figure 5 for Figure 1 A cross-sectional view along the B-B' direction;

[0019] Figure 6 for Figure 1 Another cross-sectional view along the B-B' direction;

[0020] Figure 7 An axial view of the pole post in the top cover assembly provided in an embodiment of this utility model.

[0021] 1-Top cover plate, 11-Injection hole, 2-Lower insulating component, 21-Injection channel, 22-Inclined baffle, 23-Arc-shaped baffle, 231-First part, 232-Second part, 3-Pole post, 31-Upper pole post, 32-Lower pole post, 33-Protrusion, 34-Groove, 35-Settling step, 4-Sealing component, 5-Upper insulating component, 6-Connecting piece. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Combination Figure 1 , Figure 2 This utility model discloses a top cover assembly, including: a top cover sheet 1 and a lower insulating member 2; the top cover sheet 1 is provided with an injection hole 11, the upper surface of the lower insulating member 2 abuts against the top cover sheet 1, and the lower insulating member 2 is provided with an injection channel 21, which communicates with the injection hole 11.

[0024] The injection channel 21 is provided with an inclined baffle 22 and multiple arc-shaped baffles 23. There is a gap between adjacent arc-shaped baffles 23. The inclined baffle 22 connects the arc-shaped baffles 23 and the inner wall of the injection channel 21. The inclined baffle 22 is inclined from the inner wall of the injection channel 21 towards the axial direction of the injection channel 21.

[0025] In this embodiment, multiple arc-shaped baffles 23 are provided inside the injection channel 21. The arc-shaped baffles 23 can be directly connected to the inner wall of the injection channel 21 or have gaps between them. Figure 2 For example, there is a gap between the arc-shaped baffle 23 and the inner wall of the liquid channel 21. When the electrolyte passes through the upper surface of the arc-shaped baffle 23, the arc-shaped baffle 23 decomposes the instantaneous high pressure during injection into multiple low pressure segments. The electrolyte then flows down from the gap between two adjacent arc-shaped baffles 23 and the gap in the inner wall of the injection channel 21 of the arc-shaped baffle 23, thus preventing the electrolyte from directly impacting the electrode or diaphragm and reducing damage to the bare cell.

[0026] It should be noted that the inclined baffle 22 is inclined from the inner wall of the injection channel 21 towards the axial direction of the injection channel 21, so the height of the inclined baffle 22 gradually decreases from the side closer to the inner wall of the injection channel 21 to the side farther away from the inner wall of the injection channel 21. Figure 2 For example, if the inclined baffle 22 is connected to the inner wall of the injection channel 21 and the arc-shaped baffle 23 at both ends, the height of the inclined baffle 22 gradually decreases from the side connected to the inner wall of the injection channel 21 to the side connected to the arc-shaped baffle 23.

[0027] In this embodiment, an inclined baffle 22 is further provided in the injection channel 21. The guide surface formed by the inclined angle of the inclined baffle 22 can disperse local pressure peaks, reduce mechanical stress concentration caused by high pressure injection, and protect the internal microstructure of the battery cell.

[0028] In some alternative embodiments, refer to Figure 3 The arc-shaped baffle 23 includes a first part 231 and a second part 232 connected to each other. The height of the first part 231 is greater than that of the second part 232. The inclined baffle 22 connects the first part 231 and the inner wall of the injection channel 21.

[0029] by Figure 3For example, if the inclined baffle 22 is connected to the first part 231 and the second part 232 at both ends, the height of the inclined baffle 22 gradually decreases from the side connected to the first part 231 to the side connected to the second part 232. In this embodiment, the first part 231 and the second part 232 form a step. When the electrolyte flows from the inclined baffle 22 to the second part 232, it passes through the step with a height difference. The kinetic energy of the electrolyte is dissipated in segments as it passes through, reducing the terminal impact force.

[0030] Furthermore, referring to Figure 2 The inclined baffle 22 covers the upper surface of the first part 231, and the height of the inclined baffle 22 gradually decreases from the inner wall of the injection channel 21 to the second part 232. The inclined baffle 231 connects the second part 232 and the inner wall of the injection channel 21. The inclined baffle 22 has a large area and plays a better role in guiding the flow.

[0031] Furthermore, referring to Figure 4 An inclined baffle 22 connects the annular baffle 23 and the inner wall of the injection channel 21. The height of the inclined baffle 22 is greater than the height of the annular baffle 23, and the height of the inclined baffle 22 gradually decreases from the inner wall of the injection channel 21 towards the second part 232. The inclined baffle 22 is inclined to form a guiding surface, which can disperse local pressure peaks and reduce mechanical stress concentration caused by high-pressure injection. At the same time, the height difference between the inclined baffle 22 and the annular baffle allows the kinetic energy of the electrolyte to be dissipated in segments when it passes through, reducing the terminal impact force and protecting the internal microstructure of the battery cell.

[0032] In some alternative embodiments, refer to Figure 5 The top cover assembly also includes: pole post 3, seal 4, upper insulation 5, and connecting piece 6.

[0033] The pole post 3 passes through the lower insulating member 2 and the top cover plate 1; the sealing member 4 is sleeved outside the pole post 3 and is located between the top cover plate 1 and the pole post 3; the lower surface of the upper insulating member 5 abuts against the top cover plate 1 and is located between the top cover plate 1 and the pole post 3; the connecting piece 6 is connected to the pole post 3 and cooperates with the top cover plate 1 to press the lower insulating member 2.

[0034] Specifically, in this embodiment, the sealing element 4 can be a sealing ring, which is located below the top cover plate 1 to ensure that the battery has good sealing performance, effectively prevent electrolyte leakage, and provide a good sealed environment for the internal reaction of the battery.

[0035] After assembly, the top cover plate 1 can isolate the electrical connection between the battery cells or modules inside the battery and the external environment, ensuring the safe operation of the battery system.

[0036] The lower insulating component 2 can be made of materials such as silicone rubber or styrene-butadiene rubber. These materials have good corrosion resistance and sealing properties, which can effectively prevent battery liquid leakage. They are also dustproof and waterproof, effectively preventing external factors from affecting the battery and ensuring the normal operation of the battery.

[0037] The upper insulating component 5 is located between the top cover plate 1 and the pole post 3 to prevent the top cover plate 1 and the pole post 3 from coming into contact and causing a short circuit.

[0038] Optional, refer to Figure 5 The connecting piece 6 and the pole piece 3 are formed separately, and the connecting piece 6 and the pole piece 3 are welded together. Welding clearance is set at the welding point of the connecting piece 6 and the pole piece 3. After welding, glue is applied to avoid residual welding slag from affecting the quality of the battery cell.

[0039] Furthermore, referring to Figure 6 The connecting piece 6 and the pole post 3 are integrally formed, and the top cover piece 1 and the connecting piece 6 cooperate to press the lower insulating part 2. In this embodiment, the connecting piece 6 and the pole post 3 are integrally formed, eliminating the welding step, avoiding weak welding, and reducing the assembly process of the top cover assembly; during the assembly process, the sealing part 4 is sleeved on the outside of the pole post 3, and the connecting piece 6 also plays a supporting and positioning role for the sealing part 4, which facilitates subsequent assembly, simplifies assembly, and increases production efficiency.

[0040] In some alternative embodiments, refer to Figure 7 The pole post 3 includes an upper pole post 3 part 31 and a lower pole post 3 part 32, and the connecting piece 6 is connected to the lower pole post 3 part 32; the upper pole post 3 part 31 is square, and the lower pole post 3 part 32 is elliptical.

[0041] Understandably, both the square and elliptical structures used for the terminal post 3 can eliminate circumferential rotation and ensure the torsional resistance of the finished product. The square upper terminal post 3 part 31 increases the cross-sectional area of ​​the terminal post 3 (terminal) and expands the current channel. The lower terminal post 3 part 32 is elliptical, which facilitates the welding of the lower terminal post 3 part 32 to the connecting piece 6. The elliptical structure makes welding smoother, and after welding, there is room for applying adhesive to prevent the adhesive from falling into the cell.

[0042] In some alternative embodiments, refer to Figure 5 The pole post 3 has a protrusion 33, and the sealing element 4 is disposed between the protrusion 33 and the connecting piece 6.

[0043] In this embodiment, the upper insulating member 5, the top cover plate 1, and the lower insulating member 2 are also partially located between the protrusion 33 and the connecting plate 6. The protrusion 33 and the connecting plate 6 cooperate to limit the sealing member 4, the upper insulating member 5, the top cover plate 1, and the lower insulating member 2, so that the top cover plate 1 and the connecting plate 6 press the lower insulating member 2 tightly. In this embodiment, the sealing member 4 is a sealing ring with an L-shaped cross-section.

[0044] In this embodiment, the installation method of the top cover assembly includes: first, the pole post 3 is coated with glue to form an upper insulating part 5; based on the coated pole post 3, the top cover plate 1 and the lower insulating part 2 are installed, and the top cover plate 1 and the upper insulating part 5 are engaged; then the sealing part 4 is installed, and the sealing part 4 is engaged with the top cover plate 1; finally, the pole post 3 and the connecting piece 6 are welded together.

[0045] In some alternative embodiments, refer to Figure 6 The pole post 3 is provided with a groove 34 that is recessed into the pole post 3, and the upper insulating member 5 is engaged with the groove 34.

[0046] In this embodiment, the top of the sealing element 4 also engages with the upper insulating element 5. The sealing element 4 is located between the upper insulating element 5 and the connecting piece 6, and the upper insulating element 5 and the connecting piece 6 cooperate to press the sealing element 4. The upper insulating element 5 engages with the groove 34 of the pole post 3 to prevent the upper insulating element 5 from falling off.

[0047] In this embodiment, the installation method of the top cover assembly includes: after the terminal post 3 and the connecting piece 6 are integrally formed, the insulating part 2 is installed, the sealing ring is fitted, it passes through the top cover piece 1, and finally the upper insulating part 5 is coated with glue. The upper insulating part 5 fills the groove 34 on the terminal post 3. When the battery is under different working conditions, the internal pulling of the cell and the pulling of the electrical equipment electrically connected to the terminal post 3 can better meet the strength requirements, and at the same time, it will not affect the sealing performance of the sealing ring, and can better meet the thrust strength requirements.

[0048] In some alternative embodiments, refer to Figure 5 The top of the pole post 3 is provided with a settling step 35, and the upper insulating part 5 is engaged with the settling step 35.

[0049] For example, refer to Figure 5 The upper insulating component 5 is located between the pole post 3 and the top cover plate 1 to prevent short circuits caused by contact between the top cover plate 1 and the pole post 3. The upper insulating component 5 extends towards the top of the pole post 3, covering the side wall of the pole post 3 until it engages with the settling step 35. The settling step 35 can be one or more steps.

[0050] In this embodiment, the upper insulating member 5 extends to the upper side of the pole post 3 and engages with the settling step 35. When the pole post 3 is welded to the external electrical equipment or busbar, it avoids generating electric sparks and can effectively achieve insulation.

[0051] Furthermore, the upper insulating component 5 can be a rubber-coated component or a snap-fit ​​component.

[0052] Preferably, the upper insulating component 5 is a rubber-coated component. The rubber-coated component is formed by injection molding. Compared with independent snap-fit ​​components, the rubber-coated component can reduce errors, fit tightly, and has better adaptability than snap-fit ​​components.

[0053] This utility model also discloses a battery, including the top cover assembly of any one of the above embodiments.

[0054] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A top cover assembly, characterized in that, include: Top cover plate, wherein the top cover plate is provided with a liquid injection hole; The lower insulating component has an upper surface that abuts against the top cover plate, and the lower insulating component is provided with a liquid injection channel that communicates with the liquid injection hole; The injection channel is provided with an inclined baffle and multiple arc-shaped baffles. There is a gap between adjacent arc-shaped baffles. The inclined baffle connects the arc-shaped baffle and the inner wall of the injection channel. The inclined baffle is inclined from the inner wall of the injection channel towards the axial direction of the injection channel.

2. The roof assembly of claim 1, wherein, The arc-shaped baffle includes a first part and a second part connected to each other. The height of the first part is greater than that of the second part. The inclined baffle connects the first part and the inner wall of the injection channel.

3. The roof assembly of claim 2, wherein, The inclined baffle covers the upper surface of the first part.

4. The roof assembly of claim 1, wherein, The top cover assembly also includes: A terminal post that penetrates the lower insulating member and the top cover plate; A sealing element, wherein the sealing element is sleeved outside the pole post and the sealing element is located between the top cover plate and the pole post; An upper insulating member, the lower surface of which abuts against the top cover plate, and the upper insulating member is disposed between the top cover plate and the pole post; A connecting piece is connected to an electrode post, and the connecting piece cooperates with the top cover plate to press the lower insulating component.

5. The roof assembly of claim 4, wherein, The electrode post includes an upper electrode post portion and a lower electrode post portion, and the connecting piece is connected to the lower electrode post portion; the upper electrode post portion is square, and the lower electrode post portion is elliptical.

6. The roof assembly of claim 4, wherein, The pole post has a protrusion, and the sealing element is disposed between the protrusion and the connecting piece.

7. The roof assembly of claim 4, wherein, The electrode post is provided with a groove that is recessed into the electrode post, and the upper insulating member engages with the groove.

8. The roof assembly of any of claims 4-7, wherein, The top of the pole post is provided with a settling step, and the upper insulating component engages with the settling step.

9. The roof assembly of claim 4, wherein, The connecting piece is integrally formed with the pole post.

10. A battery, characterized by Includes the top cover assembly as described in any one of claims 1 to 9.

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