Top cover assembly and battery

Abstract

The invention discloses a top cover assembly and a battery, the top cover assembly comprises a top cover sheet and a lower insulating part, the top cover sheet is provided with a liquid injection hole, the upper surface of the lower insulating part abuts against the top cover sheet, 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] The present invention relates to the field of power batteries and energy storage batteries, and more specifically, to a top cover assembly and a battery. Background Art

[0002] Lithium batteries are widely used in technical fields such as power batteries and energy storage batteries. A power battery is a power source that provides power for tools, usually providing power for electric vehicles, electric trains, electric bicycles, golf carts, etc., and is a core component of new energy vehicles, etc. Energy storage batteries are commonly used in household energy storage, power stations for solar and wind power generation equipment, portable power sources, communication base stations, etc., as well as storage batteries for renewable energy storage. Their application scenarios are different, and their performance and designs are also different.

[0003] In the prior art, the battery core is injected with liquid through the liquid injection holes on the top cover sheet and the lower plastic plate. The conventional liquid injection hole has a single structure, and the liquid will directly shoot along the direction of the liquid injection hole during liquid injection, and the pressure generated will directly act on the battery core structure. Excessive liquid injection pressure may force the positive / negative separator to partially collapse or perforate, triggering the risk of micro short circuit, resulting in the NG or scrapping of the battery core.

[0004] Therefore, there is an urgent need to provide a top cover assembly and a battery to avoid the technical problem that the pressure is too high during liquid injection, causing the separator to fall off. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art, and provide a top cover assembly, including:

[0006] A top cover sheet, the top cover sheet is provided with a liquid injection hole;

[0007] A lower insulating member, the upper surface of the lower insulating member abuts against the top cover sheet, the lower insulating member is provided with a liquid injection channel, and the liquid injection channel is communicated with the liquid injection hole;

[0008] An inclined baffle and a plurality of arc baffles are arranged in the liquid injection channel, there is a gap between adjacent arc baffles, the inclined baffle connects the arc baffle and the inner wall of the liquid injection channel, and the inclined baffle inclines from the inner wall of the liquid injection channel to the axial direction of the liquid injection channel.

[0009] The present invention also discloses a battery, including the above-mentioned top cover assembly.

[0010] Implementing the embodiments of the present invention will have the following beneficial effects:

[0011] By arranging an inclined baffle in the liquid injection channel in the present invention, the diversion surface formed by the inclination angle of the inclined baffle can disperse the local pressure peak, reduce the mechanical stress concentration caused by high-pressure liquid injection, and protect the micro-structure inside the battery core. Description of the Drawings

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Among them:

[0014] Figure 1 An axonometric view of the top cover assembly provided by the embodiment of the present invention;

[0015] Figure 2 is Figure 1 A sectional view taken along the line A-A' in

[0016] Figure 3 is Figure 1 Another sectional view taken along the line A-A' in

[0017] Figure 4 is Figure 1 Another sectional view taken along the line A-A' in

[0018] Figure 5 is Figure 1 A sectional view taken along the line B-B' in

[0019] Figure 6 is Figure 1 Another sectional view taken along the line B-B' in

[0020] Figure 7 An axonometric view of the terminal post in the top cover assembly provided by the embodiment of the present invention.

[0021] 1 - top cover sheet, 11 - liquid injection hole, 2 - lower insulating part, 21 - liquid injection channel, 22 - inclined baffle, 23 - arc baffle, 231 - first part, 232 - second part, 3 - terminal post, 31 - upper terminal post part, 32 - lower terminal post part, 33 - protruding part, 34 - groove, 35 - settlement step, 4 - seal, 5 - upper insulating part, 6 - connecting piece. Detailed implementation manners

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] Combined with Figure 1 ,Figure 2 , the present invention discloses a top cover assembly, comprising: a top cover sheet 1 and a lower insulating member 2; the top cover sheet 1 is provided with a liquid 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 a liquid injection channel 21, and the liquid injection channel 21 communicates with the liquid injection hole 11.

[0024] An inclined baffle 22 and a plurality of arc-shaped baffles 23 are arranged in the liquid injection channel 21, there is a gap between adjacent arc-shaped baffles 23, the inclined baffle 22 connects the arc-shaped baffle 23 and the inner wall of the liquid injection channel 21, and the inclined baffle 22 inclines from the inner wall of the liquid injection channel 21 towards the axial direction of the liquid injection channel 21.

[0025] In this embodiment, a plurality of arc-shaped baffles 23 are arranged in the liquid injection channel 21, and the arc-shaped baffles 23 can be directly connected to the inner wall of the liquid injection channel 21 or have a gap. Taking Figure 2 as an 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 liquid injection into multiple low pressures, and then the electrolyte flows down from the gap between two adjacent arc-shaped baffles 23 and the gap between the arc-shaped baffle 23 and the inner wall of the liquid injection channel 21, avoiding the direct impact of the electrolyte on the electrode sheet or the diaphragm and reducing the damage to the bare battery cell.

[0026] It should be noted that since the inclined baffle 22 inclines from the inner wall of the liquid injection channel 21 towards the axial direction of the liquid injection channel 21, the height of the inclined baffle 22 gradually decreases from the side close to the inner wall of the liquid injection channel 21 to the side far from the inner wall of the liquid injection channel 21. Taking Figure 2 as an example, both ends of the inclined baffle 22 are respectively connected to the inner wall of the liquid injection channel 21 and the arc-shaped baffle 23, then the height of the inclined baffle 22 gradually decreases from the side connected to the inner wall of the liquid injection channel 21 to the side connected to the arc-shaped baffle 23.

[0027] In this embodiment, an inclined baffle 22 is further arranged in the liquid injection channel 21, and the diversion surface formed by the inclination angle of the inclined baffle 22 can disperse the local pressure peak value, reduce the mechanical stress concentration caused by high-pressure liquid injection, and protect the internal microstructure of the battery cell.

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

[0029] Taking Figure 3For example, both ends of the inclined baffle 22 are respectively connected to the first part 231 and the second part 232. Then, 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, and the kinetic energy of the electrolyte is dissipated in segments when passing through, reducing the terminal impact force.

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

[0031] Further, referring to Figure 4 , the inclined baffle 22 is connected to the annular baffle 23 and the inner wall of the liquid 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 liquid injection channel 21 to the second part 232. The inclined baffle 22 is inclined to form a flow guiding surface that plays a role in guiding the flow, which can disperse the local pressure peak, reduce the mechanical stress concentration caused by high-pressure liquid injection. At the same time, there is a height difference between the inclined baffle 22 and the annular baffle, and the kinetic energy of the electrolyte is dissipated in segments when passing through, reducing the terminal impact force and protecting the internal microstructure of the battery cell.

[0032] In some alternative embodiments, referring to Figure 5 , the top cover assembly further includes: a pole column 3, a seal 4, an upper insulating member 5, and a connecting piece 6.

[0033] The pole column 3 penetrates through the lower insulating member 2 and the top cover sheet 1; the seal 4 is sleeved outside the pole column 3, and the seal 4 is located between the top cover sheet 1 and the pole column 3; the lower surface of the upper insulating member 5 abuts against the top cover sheet 1, and the upper insulating member 5 is disposed between the top cover sheet 1 and the pole column 3; the connecting piece 6 is connected to the pole column 3, and the connecting piece 6 and the top cover sheet 1 cooperate to tightly press the lower insulating member 2.

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

[0035] After the top cover sheet 1 is assembled, it 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 part 2 can be made of materials such as silicone rubber and styrene-butadiene rubber. These materials have good corrosion resistance and sealing performance, and can effectively prevent battery liquid leakage. It can also prevent dust and water, effectively prevent the influence of external factors on the battery, and ensure the normal operation of the battery.

[0037] The upper insulating part 5 is located between the top cover piece 1 and the pole column 3 to prevent the top cover piece 1 and the pole column 3 from contacting each other and causing a short circuit.

[0038] Optionally, referring to Figure 5 , the connecting piece 6 and the pole column 3 are formed separately, the connecting piece 6 and the pole column 3 are welded, and a welding avoidance space is set at the welding place of the connecting piece 6 and the pole column 3. After welding, sealant is applied to avoid residual welding slag affecting the quality of the battery cell.

[0039] Furthermore, referring to Figure 6 , the connecting piece 6 and the pole column 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 column 3 are integrally formed, eliminating the welding step, avoiding poor welding, and reducing the assembly process of the top cover assembly. During the assembly process, the seal 4 is sleeved outside the pole column 3, and the connecting piece 6 also plays a role in supporting and positioning the seal 4, facilitating subsequent assembly. The assembly is simple and the production efficiency is high.

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

[0041] It can be understood that both the square and quasi-elliptical structures of the pole column 3 can eliminate circumferential rotation and ensure the torsional resistance of the finished product. The square upper pole column part 31 increases the cross-sectional area of the pole column 3 (terminal), expanding the current channel. The lower pole column part 32 is quasi-elliptical, facilitating the welding of the lower pole column part 32 and the connecting piece 6. The quasi-elliptical structure has smoother welding, and after welding, there is space for applying sealant to avoid welding dropping into the battery cell.

[0042] In some alternative embodiments, referring to Figure 5 , the pole column 3 is provided with a protruding part 33, and the seal 4 is arranged between the protruding part 33 and the connecting piece 6.

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

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

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

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

[0047] In this embodiment, the installation method of the top cover assembly includes: after the pole post 3 and the connecting piece 6 are integrally formed, the lower insulating part 2 is installed, the sealing ring is sleeved, passed 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 pole post 3. When the battery is under different working conditions, when there is pulling inside the battery cell and pulling by the electrical equipment electrically connected to the pole post 3, it 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, referring to Figure 5 , the top of the pole post 3 is provided with a settlement step 35, and the upper insulating part 5 is engaged with the settlement step 35.

[0049] Exemplarily, referring to Figure 5 , part of the upper insulating part 5 is located between the pole post 3 and the top cover piece 1 to prevent the top cover piece 1 and the pole post 3 from coming into contact and causing a short circuit. The upper insulating part 5 extends to the top of the pole post 3 and covers the side wall of the pole post 3 until it is engaged with the settlement step 35. The settlement step 35 can be one-level or multi-level.

[0050] In this embodiment, the upper insulating part 5 extends to the upper side of the pole post 3 and is engaged with the settlement step 35. When the pole post 3 is welded to an external electrical device or a bus bar, it can avoid generating electric sparks and effectively achieve insulation.

[0051] Furthermore, the upper insulating part 5 can be a coated part or a snap part.

[0052] Preferably, the upper insulating part 5 is a coated part. The coated part is formed by injection molding. Compared with an independent snap part, the coated part can reduce errors, have a tight fit, and have better adaptability than the snap part.

[0053] The present invention also discloses a battery, including the top cover assembly in any one of the above embodiments.

[0054] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent shall be subject to the appended claims.

Claims

1. A top cover assembly, characterized in that: include: A top cover sheet, wherein the top cover sheet is provided with a liquid injection hole; A lower insulating member, the upper surface of which is in contact with the top cover sheet, and the lower insulating member is provided with a liquid injection channel, which is communicated with the liquid injection hole; An inclined baffle and a plurality of arc-shaped baffles are provided in the injection channel, and gaps are provided between adjacent arc-shaped baffles. The inclined baffle connects the arc-shaped baffle and the inner wall of the injection channel, and the inclined baffle is inclined from the inner wall of the injection channel toward the axial direction of the injection channel.

2. The top cover assembly according to claim 1, characterized in that: The arc-shaped baffle includes a first portion and a second portion connected to each other, the first portion is higher than the second portion, and the inclined baffle connects the first portion and the inner wall of the injection channel.

3. The top cover assembly according to claim 2, characterized in that: The inclined baffle covers an upper surface of the first portion.

4. The top cover assembly according to claim 1, characterized in that: The top cover assembly also includes: A pole, wherein the pole passes through the lower insulating member and the top cover sheet; A sealing member, wherein the sealing member is sleeved outside the pole and is located between the top cover sheet and the pole; An upper insulating member, the lower surface of which is in contact with the top cover sheet, and the upper insulating member is disposed between the top cover sheet and the pole; A connecting piece, wherein the connecting piece is connected to the pole, and the connecting piece cooperates with the top cover piece to press the lower insulating piece.

5. The top cover assembly according to claim 4, characterized in that: The pole comprises an upper pole portion and a lower pole portion, and the connecting piece is connected to the lower pole portion; the upper pole portion is square, and the lower pole portion is elliptical.

6. The top cover assembly according to claim 4, characterized in that: The pole is provided with a protruding portion, and the sealing member is arranged between the protruding portion and the connecting piece.

7. The top cover assembly according to claim 4, characterized in that: The pole is provided with a groove recessed toward the inside of the pole, and the upper insulating member is engaged with the groove.

8. The top cover assembly according to any one of claims 4 to 7, characterized in that: A sinking step is provided on the top of the pole, and the upper insulating member is engaged with the sinking step.

9. The top cover assembly according to claim 4, characterized in that: The connecting piece and the pole are integrally formed.

10. A battery, characterized in that: It comprises a top cover assembly as claimed in any one of claims 1 to 9.

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