Top insulation sheet wrapping cover plate assembly

Abstract

The utility model relates to the field of batteries, in particular to a top insulation sheet wrapping cover plate assembly which comprises an integral cover plate, a positive pole, a negative pole, a sealing ring, an insulation support, an anti-explosion valve and a protection sheet of the anti-explosion valve. The insulating patch covers the whole cover plate, so that the short circuit risk of conductors such as metal wires between the edge of the end surface of the pole and the fixed part of the cover plate can be effectively prevented, the creepage phenomenon generated between the pole of the single battery of the series high-voltage module and the cover plate is avoided, and the safety performance of the battery cell and the module is improved; the whole cover plate effectively enhances the connection strength of the pole and the top cover, simplifies the structure and the manufacturing process of the cover plate sealing assembly, and reduces the cost; due to the wrapping design of the square integral cover plate and the pole, the phenomena of cover plate liquid leakage and the like caused by rotation of the pole are prevented, and the sealing stability and reliability are improved; the optimized explosion-proof valve is stable and reliable in structure, and the safety performance of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a top insulating sheet package covering plate assembly. Background Art

[0002] Power batteries refer to batteries used in electric vehicles, electric bicycles, electric tricycles, battery vehicles, solar energy storage, power energy storage, portable electronic devices, etc. Power batteries are the power source of electric vehicles, providing driving power for the vehicle and ensuring the normal operation of the vehicle; power batteries need to have high energy density, high capacity, high power, good cycle life, high safety and other characteristics.

[0003] The battery top cover is used on the top of the power battery to protect other components inside the battery pack and ensure the safety and stability of the battery. The top cover needs to meet multiple functional requirements, including insulation, fire prevention, heat dissipation and battery protection. The structural design should ensure that the top cover has sufficient strength and rigidity, while meeting the requirements of simple structure, stability, reliability and lightweight. During the manufacturing process of the top cover, the metal plates need to be connected together through a welding process, and the welding quality directly affects the performance and reliability of the top cover. The top cover needs to have good sealing properties to prevent water, oxygen and other harmful substances from entering the battery. Silicone rubber, polyurethane or butyl rubber are usually used for sealing. The top cover needs to have good airtightness to prevent leakage of internal pressure of the battery; battery safety is one of the core issues of concern to the industry, and the top cover needs to have good safety measures to deal with battery failures.

[0004] The existing battery cover has a complex structure, many processes, is relatively heavy, has poor sealing reliability and stability, and is prone to causing leakage accidents or battery damage. The design of the pole and explosion-proof valve is not perfect, affecting the battery life and safety performance. Utility Model Content

[0005] The purpose of the utility model is to solve the structural defects and performance deficiencies of the above-mentioned battery cover, ensure that there is no safety risk, reduce the structural weight, simplify the structure and manufacturing process of the cover assembly, improve the reliability and stability of the seal and the safety performance of the battery during use, and reduce costs.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a secondary battery with a covering plate assembly, comprising a top insulating patch and a top cover assembly.

[0007] The insulating patch includes an insulating protection part on the left and a protection part on the right to cover the pole sealing component fixing part of the integral cover plate. An explosion-proof via area is also provided on the insulating patch.

[0008] Furthermore, an insulating patch is attached to the cover plate, and the insulating patch is provided with two insulating protection parts which respectively fit and cover the outside of the fixed part of the whole cover plate, so as to prevent short circuit caused by burrs or metal wires between the periphery of the positive and negative poles and the fixed part of the cover plate, and creepage caused by the high-voltage series module between the pole and the fixed part of the cover plate, thereby improving the safety performance of the battery cell.

[0009] Furthermore, a QR code area can be set on the insulating patch, and the QR code can be used as an identification mark of the entire battery.

[0010] The top cover assembly includes an integral cover plate, a positive pole and a negative pole, a sealing ring and upper plastic, an insulating bracket, an explosion-proof valve and a protective sheet.

[0011] The positive and negative posts can be round or square.

[0012] The positive pole column and the negative pole column both include an upper boss, an upper end surface, a lower end surface and a lower boss.

[0013] The negative electrode column and the positive electrode column are the two poles of the secondary battery, respectively. They are compressed with the accommodating area, fixing part and supporting part of the overall cover, the sealing ring and the optional upper plastic combination package to form a electrode assembly. The negative electrode column and the positive and negative electrode columns are welded at one end through the positive and negative electrode connecting pieces, and the other end is welded to the positive and negative electrode ears of the connecting winding core assembly.

[0014] The negative pole and the positive pole are placed on the sealing ring, in the middle of the upper plastic and under the fixing part of the cover. After the fixing part of the cover is tightly wrapped, the sealing ring plays a sealing and positioning role at the same time.

[0015] The cover plate is composed of a receiving area, a support plate, and a fixing part. The sealing ring with the negative pole is placed in the negative receiving area of ​​the cover plate. The sealing ring with the positive pole is placed in the positive receiving area of ​​the cover plate.

[0016] After the negative pole, the positive pole and the sealing ring are placed on the cover plate, the fixing part of the cover plate is compressed and sealed to form a sealed cover plate assembly.

[0017] The insulating bracket is set between the cover plate and the winding core assembly, and has insulation and long-term chemical corrosion resistance, as well as mechanical, thermal shock and stress resistance. It plays an insulating and supporting role.

[0018] An explosion-proof valve is placed between the cover plate assembly and the insulating bracket, and the periphery of the explosion-proof valve and the side wall of the explosion-proof valve accommodation area corresponding to the cover plate are integrated by laser welding, and then the cover plate assembly and the insulating bracket are ultrasonically welded together to make the insulating bracket and the cover plate integrated.

[0019] After the positive and negative ears of the battery cell assembly are ultrasonically welded to the positive and negative electrode connecting pieces, the other ends of the positive and negative electrode connecting pieces are welded to the bottom of the positive and negative electrode posts of the cover assembly. The assembly is then put into the shell, the periphery of the cover is welded to the opening of the aluminum shell and then liquid is injected. The liquid injection hole is welded to the sealing pin, the protective film is covered with the aluminum shell, and finally the insulating patch is pasted on the cover assembly to form a secondary battery.

[0020] Preferably, a glue column is provided on the top surface of the insulating bracket, and an inverted cone blind hole accommodating area corresponding to the glue column on the insulating bracket is provided under the cover plate, and the glue column and the corresponding accommodating area of ​​the cover plate are fixed by ultrasonic welding.

[0021] Preferably, the negative electrode column and the positive electrode column may be round or square, and the bottom of the electrode column may be set to be flat or to have a bottom boss.

[0022] Preferably, the cross section of the sealing ring can be 7-shaped, L-shaped or C-shaped, and the sealing ring is an integrated sealing ring that can replace the plastic and has an insulating sealing function, or a sealing ring plus plastic is provided to respectively have the functions of sealing and insulating.

[0023] Preferably: the explosion-proof valve is provided with a connection area, the reinforcing ribs may be arch-shaped or 8-shaped, a protective sheet is provided on the top of the explosion-proof notch, the protective sheet protects the explosion-proof valve from being damaged, and an exhaust position is provided on the joint surface with the cover plate, which does not affect the pressure relief of the explosion-proof valve.

[0024] Preferably, after the negative electrode column and the positive electrode column are placed on the cover plate, a compression and sealing process is performed to form a cover plate sealed electrode column assembly.

[0025] The compression and sealing process adopts the method of fixing the pole by pressing, which has good fixing effect, saves energy and reduces costs.

[0026] Preferably, an insulating and sealing rubber ring is provided between the pole and the top cover, which ensures the insulation and sealing of the pole and the top cover after being compressed, simplifies the cover plate structure and manufacturing process, reduces the number of parts, and reduces costs.

[0027] Preferably: the distance from the inner hole of the protective part of the insulating patch to the peripheral edge of the nearby positive electrode column or the negative electrode column is W = 0.2mm ~ 1.2mm; the height of the boss on the electrode column is H = 0.5mm ~ 2.0mm; the distance from the lower end surface of the positive electrode column or the negative electrode column to the bottom surface of the top cover is L = -1.2mm ~ +1.2mm.

[0028] Compared with the prior art, the beneficial effects of the utility model are:

[0029] The utility model has a simple structure, few manufacturing processes, relatively few materials and low cost; the square pole design and limited fixation improve the torsional force of the pole assembly, the structure is stable and the sealing performance is reliable; the insulating patch covers the exposed parts of the surrounding sides of the pole assembly to improve the safety performance and ensure that there is no short circuit during the life cycle of the battery cell and no creepage risk for the series high-voltage module; the overall upsetting cover plate structure effectively enhances the rigidity and strength of the pole and the top cover and improves the service life; the optimized explosion-proof valve is more stable and improves the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is an exploded view of the overall top cover structure of Example 1 of the utility model;

[0031] Figure 2 This is a cross-sectional view of the overall cover plate assembly in Example 1 of the present utility model;

[0032] Figure 3 It is a partial cross-sectional view of the top cover with a sealing ring and plastic in Example 1 of the utility model;

[0033] Figure 4 It is a partial cross-sectional view showing the positional relationship between the top patch and the cover plate pole in Example 1 of the utility model;

[0034] Figure 5 This is a cross-sectional view of the cover plate assembly in Example 2 of the present utility model;

[0035] Figure 6 This is a partial cross-sectional view of the cover plate assembly in Example 2 of the present utility model;

[0036] Figure 7 This is a schematic diagram of the cover plate structure of Example 2 of the utility model;

[0037] Figure 8 This is a schematic diagram of the front and back structures of the support frame of Example 2 of the utility model;

[0038] Fig. 9 This is a schematic diagram of the structure of the bow-shaped explosion-proof valve of Embodiments 1 and 2 of the present utility model;

[0039] Fig.10 This is a schematic diagram of the front and back structures of the sealing ring of Example 2 of the utility model.

[0040] In the figure:

[0041] 100, insulating patch; 101, insulating protection part; 102, explosion-proof via area; 103, QR code area; 110, insulator; 110a, conductor; 200, negative pole; 300, positive pole; 400, sealing ring; 500, cover plate; 600, insulating bracket; 700, explosion-proof valve; 800, protective sheet;

[0042] 301, upper boss; 302, upper end surface; 303, lower end surface; 304, lower boss;

[0043] 401, positioning ring; 402, plastic application;

[0044] 500A, cover plate assembly; 501, accommodating area; 502, support plate; 503, fixing portion; 504, rivet column; 505, rivet;

[0045] 601, splitter cone; 602, splitter hole; 603, flow hole;

[0046] 701, explosion-proof notch; 702, connection area; 703, reinforcement rib;

[0047] 900, support frame; 903, countersunk hole. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0049] Figure 1-4 A top insulation sheet package cover plate assembly is shown.

[0050] The insulating patch includes an insulating protective part 101 on the left and right to cover the pole sealing component fixing part 503 of the integral cover plate, eliminate the short circuit between the pole and the fixing part 503 of the integral cover plate or the creepage phenomenon between the series high-voltage module batteries, and improve the safety performance. An explosion-proof via area 102 is also provided on the insulating patch. A QR code area 103 is also provided on the insulating patch, and the QR code can be used as an identification mark of the entire battery.

[0051] The integral top cover assembly includes an integral cover plate 500 , a positive pole 200 and a negative pole 300 , a sealing ring 400 and an upper plastic 402 , an insulating bracket 600 , an explosion-proof valve 700 and a protective sheet 800 .

[0052] The negative electrode column 200 and the positive electrode column 300 are the two poles of the secondary battery, which are called electrode assemblies. The negative electrode column 200 and the positive electrode column 300 are connected to the winding core assembly 3 through the positive and negative electrode connecting sheets 2. The negative electrode column 200 and the positive electrode column 300 are respectively fixed on the sealing ring 400, which plays a sealing and fixing role at the same time.

[0053] The negative electrode column 200 and the positive electrode column 300 are square in shape.

[0054] The positive electrode column 300 and the negative electrode column 200 both include an upper boss 301, an upper end surface 302, a lower end surface 303, and a lower boss 304; Figure 5 .

[0055] The distance from the inner hole of the protective portion 101 of the insulating patch 100 to the peripheral edge of the positive electrode column 300 or the negative electrode column 200 nearby is W=0.2mm~1.2mm; the height of the boss on the electrode column is H=0.5mm~2.0mm; the distance from the lower end surface of the positive electrode column 300 or the negative electrode column 200 to the bottom surface of the top cover 500 is L=-1.2mm~+1.2mm.

[0056] The sealing ring 400 includes a positioning ring 401 and a plastic 402 on the positioning ring 401. The positioning ring 401 fixes the negative pole 200 and the positive pole 300.

[0057] The cover plate 500 is composed of a receiving area 501, a support plate 502, and a fixing portion 503. The sealing ring with the negative electrode column is placed in the negative electrode receiving area of ​​the cover plate. The sealing ring with the positive electrode column is placed in the positive electrode receiving area of ​​the cover plate.

[0058] After the negative pole 200 and the positive pole 300 are placed on the cover plate 500, a sealing process is performed by the pressing and fixing part 503. The pressing and sealing process uses a pressing and wrapping method to fix the poles tightly, which has a good pressing and fixing effect, saves energy, and reduces costs, thereby forming a cover plate assembly 500A.

[0059] The square positive pole 300 and the square negative pole 200 in the cover assembly 500A are fixed by the sealing ring 400 and the plastic 402 thereon and the fixing part 503 of the cover 500. During use, the poles are not easily twisted, ensuring that the negative pole 200 and the positive pole 300 are firm and the seal is reliable.

[0060] Insulation bracket 600 has insulation and long-term chemical corrosion resistance, excellent wear resistance and good impact resistance, as well as mechanical, thermal shock and stress resistance. It plays an insulating and supporting role.

[0061] An explosion-proof valve 700 is placed between the cover plate assembly 500A and the insulating support 600, and then the cover plate assembly 500A and the insulating support 600 are welded together by ultrasonic welding.

[0062] The insulating patch 100 is attached to the cover plate 500, and the insulating patch 100 is provided with two insulating protection parts 101 which respectively adhere to and cover the outside of the fixing part 503 of the whole cover plate, so as to prevent the short circuit caused by burrs or metal wires between the periphery of the positive and negative poles and the fixing part 503 of the cover plate, and the creepage phenomenon caused by the high-voltage series module between the pole and the fixing part of the cover plate, thereby improving the safety performance of the battery cell.

[0063] A protective sheet 800 is placed in the explosion-proof via area 101 of the insulating patch to better protect the explosion-proof valve.

[0064] The explosion-proof valve 700 is disposed on the bottom surface of the cover plate 500 , and the protection sheet 800 is disposed on the top surface of the cover plate 500 at a position corresponding to the explosion-proof valve 700 .

[0065] The explosion-proof valve 700 is provided with explosion-proof notches 701 and a connection area 702 at its edge, and a reinforcing rib 703 is provided in the middle of the explosion-proof valve 700. The reinforcing rib 703 is in an 8-shape or a bow-shape.

[0066] The shortest distance from the starting and end of the reinforcing rib 703 to the explosion-proof notch 701 is A=2mm~5mm, the back-to-back distance between the two reinforcing ribs 703 is B=0mm~5mm, and the length of the straight line portion in the middle of the reinforcing rib 703 is C=2mm~10mm.

[0067] The structure is extremely simple, the manufacturing process is few, stable and reliable, the overall cover does not require laser welding equipment, and the cost is low.

[0068] Embodiment 2:

[0069] The difference between this embodiment and embodiment 1 is that the cover plate 500 and the support body 900 are fixedly installed by riveting;

[0070] The accommodating area 501 of the cover plate 500 is correspondingly provided with a rivet column 504.

[0071] The rivet column 504 of the cover plate 500 and the countersunk hole 903 of the support body 900 are assembled correspondingly, and then the rivet column 504 of the cover plate 500 is riveted to form a rivet 505, so as to connect the support body 900 and the cover plate 500 into a whole.

[0072] The top surface of the insulating support 600 is evenly provided with plastic columns, and the cover plate 500 has reverse blind holes at positions corresponding to the mating surfaces of the insulating support, and is fixed to the plastic columns of the insulating support 600 by ultrasonic welding.

[0073] In this embodiment, the cover plate 500 is provided with a receiving area, a through hole is provided in the middle of the receiving area, and a rivet column 50 is provided outside the through hole of the receiving area. After the sealing ring 400 and the poles 200 and 300 are placed in the receiving area, the rivet column 504 is pressed to fill the countersunk hole 903 of the support frame 900 to form a rivet 505, and the insulator 110 and the conductor 110a are injection molded in the mold to cover the support frame 900 and the rivet 505, so as to form the cover plate sealing assembly covering the pole.

[0074] The thinner pole design can obtain better battery capacity. A connection area is provided on the explosion-proof valve to prevent the explosion-proof valve from flying out when the pressure is released. The design of the protective sheet also protects the explosion-proof valve from being hit by the outside world. The rivet column support frame in the cover plate accommodating area corresponds to the countersunk hole design. The pole, sealing ring, cover plate and support frame are fixed and sealed by pier pressing, and then plastic is injected into the mold, which can effectively avoid short circuit and creepage under high-voltage working conditions. The cover plate and the support frame of this structure are connected by riveting, and laser welding is not required, which avoids deformation of the cover plate caused by overheating of laser welding and reduces the shaping process. The structure is simple, stable and reliable, and reduces manufacturing cost and laser equipment cost.

[0075] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make some simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A top insulation sheet package covering plate assembly, characterized in that: The cover plate assembly comprises: an insulating patch (100), a cover plate (500), a positive pole (300), a negative pole (200), a sealing ring (400) or an upper plastic (402) with a sealing function, an insulating bracket (600), an explosion-proof valve (700) and a protective sheet (800) thereof. The insulating patch (100) is attached to the cover plate (500), and the insulating patch (100) is provided with two insulating protection parts (101) which are respectively attached to and cover the outside of the fixing part (503) of the cover plate (500), so as to prevent a short circuit caused by burrs or metal wires between the periphery of the positive pole (300) and the negative pole (200) and the fixing part (503), and a creepage phenomenon caused by a high-voltage series module between the positive pole (300) and the negative pole (200) and the fixing part (503), thereby improving the safety performance of the battery cell.

2. A top insulation sheet package covering plate assembly according to claim 1, characterized in that: The positive pole (300) and the negative pole (200) both include an upper boss (301), an upper end surface (302), a lower end surface (303), and a lower boss (304); the sealing ring (400) may include a sealing insulating member composed of a positioning ring (401) and an upper plastic (402); and the cover plate (500) includes a containing area (501), a support plate (502), and a fixing portion (503).

3. A top insulation sheet package covering plate assembly according to claim 2, characterized in that: The distance from the inner hole of the protective portion (101) of the insulating patch (100) to the peripheral edge of the positive pole (300) or the negative pole (200) nearby is W=0.2mm~1.2mm; the height of the boss (301) on the pole is H=0.5mm~2.0mm; and the distance from the lower end surface (303) of the positive pole (300) or the negative pole (200) to the bottom surface of the top cover is L=-1.2mm~+1.2mm.

4. The top insulation sheet package cover plate assembly according to claim 1, characterized in that: The positive pole (300) and the negative pole (200) are both placed in the sealing ring (400), and then placed together in the accommodation area (501) of the cover plate (500), and the sealing ring is compressed between the pole and the fixing part (503) by wrapping and pressing the fixing part (503), thereby forming a sealing cover plate assembly (500A); The positive pole (300) and the negative pole (200) in the cover plate assembly (500A) are arranged in a square shape, and the fixing portion (503) of the cover plate, the sealing ring (400) and the upper plastic (402) are arranged in a square shape. The positive pole (300) and the negative pole (200) are pressed together with the sealing ring (400) and the upper plastic (402) at the fixing portion (503) of the cover plate, and the positive pole (300) and the negative pole (200) are not easily twisted.

5. The top insulation sheet package covering plate assembly according to claim 3, characterized in that: The cross section of the sealing ring (400) may be 7-shaped, L-shaped or C-shaped.

6. The top insulation sheet package cover plate assembly according to claim 3, characterized in that: The cover plate (500) is provided with a receiving area (501), a through hole is provided in the middle of the receiving area, a rivet column (504) is provided outside the through hole in the receiving area, the sealing ring (400) is placed in the receiving area, the positive pole (300) and the negative pole (200) are respectively placed, and the rivet column (504) is pressed to fill the countersunk hole (903) of the support frame (900) to form a rivet (505), and an insulator (110) and a conductor (110a) are injection molded in the mold to cover the support frame (900) and the rivet (505), so as to form a cover plate sealing assembly covering the pole, and the positive pole (300) and the negative pole (200) are arranged in a circular or square shape.

7. A top insulation sheet package covering plate assembly according to claim 6, characterized in that: The support frame (900) is in the shape of a square or circular concentric ring, with a through hole in the middle; a countersunk hole (903) is provided on the support frame (900) and corresponds to a rivet column (504) on the accommodating area (501) of the cover plate (500), and after installation, the rivet (505) is tightly fitted by riveting, so that the cover plate (500) and the support frame (900) are connected as one.

8. The top insulation sheet package covering plate assembly according to claim 3, characterized in that: The explosion-proof valve (700) is arranged on the bottom surface of the cover plate (500), and the protective sheet (800) is arranged on the top surface of the cover plate (500) at a position corresponding to the explosion-proof valve (700); an explosion-proof notch (701) and a connection area (702) are arranged on the edge of the explosion-proof valve (700); a reinforcing rib (703) is arranged in the middle of the explosion-proof valve (700); two reinforcing ribs (703) are arranged back to back; the reinforcing rib (703) may be in an arch shape or an 8-shape; the shortest distance from the starting end and the end of the reinforcing rib (703) to the explosion-proof notch (701) is A=2mm~5mm; the back-to-back distance between the two reinforcing ribs (703) is B=0mm~5mm; and the length of the straight line portion in the middle of the reinforcing rib (703) is C=2mm~10mm.

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