Cover plate, battery monomer and battery pack

Abstract

The utility model discloses a cover plate, battery monomer and battery pack, the cover plate comprises a stop frame and a top cover, the top cover is provided with an upper positive pole hole, an upper negative pole hole, an upper liquid injection hole and an explosion-proof valve, the cover plate is characterized in that a first protection wing and a second protection wing extend in the length direction of the top cover; the bottom of the first protection wing is flush with the bottom of the top cover, the top of the second protection wing is flush with the top of the top cover, the cover plates can be arranged in an overlapped mode, and the first protection wing and the second protection wing are combined. The battery pack is novel in design, the cover plates at the tops of the battery monomers are overlapped, particles can be prevented from entering a battery roll core during welding, the probability of short circuit is reduced, meanwhile, the integrity of the battery pack can be improved, the structural strength of the battery pack is improved, more reliable protection is provided for a battery pack, the sealing performance of the battery pack can be enhanced, internal pressure can be better borne, and the service life of the battery pack is prolonged. The risk of gas leakage is reduced, and the safety of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cover plate, a battery cell and a battery pack. Background Art

[0002] Lithium batteries use lithium metal or lithium alloys as anode materials and a non-aqueous electrolyte solution. During operation, lithium ions participate in redox reactions, converting chemical energy into electrical energy. Evaluation criteria for a lithium battery product include energy density, cycle life, rate capability (discharge performance at different currents), safety, and operating temperature.

[0003] In lithium-ion batteries, the electrolyte primarily serves as a carrier for ion migration, ensuring ion transport between the positive and negative electrodes. It has a significant impact on battery performance indicators such as safety, cycle life, charge and discharge rate, high and low temperature performance, and energy density. The electrolyte is generally composed of a high-purity organic solvent, an electrolyte lithium salt, and additives, all formulated in specific proportions.

[0004] During the battery production process, the battery cover and the battery shell need to be welded. The particulate dust generated during welding can easily enter the interior of the roll core through the opening at the top of the roll core, puncture the diaphragm during the short-circuit test, causing the short-circuit test to fail, increasing the company's scrap and thus increasing costs. Summary of the Invention

[0005] The purpose of the present invention is to provide a cover plate, a battery cell and a battery pack to solve the problems raised in the above-mentioned background technology. To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cover plate, comprising a stop frame and a top cover, the top cover being provided with an upper positive pole hole, an upper negative pole hole, an upper liquid filling hole and an explosion-proof valve, a first protective wing and a second protective wing extending in the length direction of the top cover, the bottom of the first protective wing being flush with the bottom of the top cover, the top of the second protective wing being flush with the top of the top cover, the top of the first protective wing and the bottom of the second protective wing being provided with sealing gaskets, and multiple cover plates can be arranged in an overlapping manner so that the first protective wing and the second protective wing are combined.

[0006] Preferably, the cover plate at the far left is only provided with the second protective wing, and the cover plate at the far right is only provided with the first protective wing.

[0007] Preferably, a plurality of blocks are provided at the bottom of the stop frame, and the stop frame is also provided with a lower positive pole hole, a lower negative pole hole, a lower liquid injection hole and an explosion-proof valve slot, and an exhaust channel is opened on the explosion-proof valve slot.

[0008] Preferably, an insulating sheet is provided between the stop frame and the top cover, and a pole protection plate is also provided on the top cover.

[0009] The utility model also provides the following technical solution: a battery cell, using the above-mentioned cover plate.

[0010] Preferably, the battery cell further comprises a battery housing, a top of the battery housing is provided with a plurality of mounting grooves, and the clamping blocks of the stop frame are clamped in the mounting grooves.

[0011] Preferably, a battery coil core is provided in the battery shell, and a positive electrode column and a negative electrode column are provided on the battery coil core.

[0012] The utility model also provides the following technical solution: a battery pack, which is composed of the above-mentioned battery monomers.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention has a novel design, utilizes a reasonable mechanical structure, and cleverly unleashes the inherent potential of various elements. A first protective wing and a second protective wing extend in the length direction of the top cover, and adjacent first protective wings and second protective wings are staggered, so that the cover plates on the top of each battery cell are arranged in an overlapping manner. During welding, particles can be blocked from entering the battery coil core, reducing the probability of short circuits. At the same time, the integrity of the battery pack can be improved, the structural strength of the battery pack can be improved, and more reliable protection can be provided for the battery pack. The sealing of the battery pack can also be strengthened to better withstand internal pressure, reduce the risk of gas leakage, and improve the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an exploded view of the battery cell structure in the present utility model;

[0015] Figure 2 This is a schematic diagram of the top cover structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the battery pack structure in the present utility model;

[0017] Figure 4 This is a schematic diagram of the battery pack structure in the present utility model;

[0018] Figure 5 for Figure 4 Enlarged view of part A in the middle;

[0019] In the figure, the stopper frame 1, the lower positive electrode hole 11, the lower negative electrode hole 12, the lower liquid filling hole 13, the explosion-proof valve slot 14, the exhaust channel 15, the clamping block 16, the top cover 2, the upper positive electrode hole 21, the upper negative electrode hole 22, the upper liquid filling hole 23, the explosion-proof valve 24, the first protective wing 31, the second protective wing 32, the sealing gasket 33, the electrode protective plate 4, the battery housing 5, the mounting slot 51, and the battery coil core 52. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-5 The utility model provides a technical solution: a cover plate, including a stop frame 1 and a top cover 2, the top cover 2 is provided with an upper positive pole hole 21, an upper negative pole hole 22, an upper liquid injection hole 23 and an explosion-proof valve 24, and a first protective wing 31 and a second protective wing 32 extend in the length direction of the top cover 2, the bottom of the first protective wing 31 is flush with the bottom of the top cover 2, and the top of the second protective wing 32 is flush with the top of the top cover 2, forming an offset, and multiple cover plates can be arranged in an overlapping manner to combine the first protective wing 31 and the second protective wing 32.

[0022] The top of the first protective wing 31 and the bottom of the second protective wing 32 are both provided with sealing gaskets 33 to enhance the sealing effect. The thickness of the first protective wing 31 plus the sealing gasket 33 is consistent with the thickness of the second protective wing 32 plus the sealing gasket 33, and both are half the thickness of the top cover 2. Therefore, the thickness of the first protective wing 31 and the second protective wing 32 after being combined and overlapped is consistent with the thickness of the top cover 2.

[0023] The cover plate at the leftmost end is only provided with the second protective wing 32 , and the cover plate at the rightmost end is only provided with the first protective wing 31 .

[0024] The bottom of the stop frame 1 is provided with a plurality of blocks 16 , and the stop frame 1 is also provided with a lower positive pole hole 11 , a lower negative pole hole 12 , a lower liquid injection hole 13 and an explosion-proof valve slot 14 , and an exhaust channel 15 is opened on the explosion-proof valve slot 14 .

[0025] The upper injection hole 23 corresponds to the lower injection hole 13, and the electrolyte is injected into the battery from the injection hole.

[0026] The explosion-proof valve 24 is used to prevent battery explosion and protect the battery structure, thereby improving battery safety.

[0027] An insulating sheet is provided between the stop frame 1 and the top cover 2 , and a pole protection plate 4 is also provided on the top cover 2 .

[0028] The utility model also provides the following technical solution: a battery cell, using the above-mentioned cover plate.

[0029] The battery cell also includes a battery housing 5, and a plurality of mounting grooves 51 are formed on the top of the battery housing 5. The clamping blocks 16 of the stop frame 1 are clamped in the mounting grooves 51. The plurality of clamping blocks 16 are used to position the cover plate and the battery housing 5, ensuring that the cover plate is accurately installed on the battery housing 5 for easy welding.

[0030] A battery coil core 52 is provided in the battery shell 5, and a positive electrode column and a negative electrode column are provided on the battery coil core 52. The positive electrode column passes through the lower positive electrode column hole 11 and the upper positive electrode column hole 21 in sequence, and the negative electrode column passes through the lower negative electrode column hole 12 and the upper negative electrode column hole 22 in sequence. The top is fixed by the electrode column protection plate 4.

[0031] The present invention also provides the following technical solution: a battery pack, which is composed of the above-mentioned battery cells, and the cover plates on the top of each battery cell are arranged in an overlapping manner. During welding, the cover plates can block particles from entering the battery coil 52, thereby reducing the probability of short circuit. At the same time, the integrity of the battery pack can be improved, the structural strength of the battery pack can be improved, and more reliable protection can be provided for the battery group. The sealing of the battery pack can also be strengthened to better withstand internal pressure, reduce the risk of gas leakage, and improve the safety of the battery.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cover plate, comprising a stop frame (1) and a top cover (2), wherein the top cover (2) is provided with an upper positive pole hole (21), an upper negative pole hole (22), an upper liquid injection hole (23) and an explosion-proof valve (24), characterized in that: A first protective wing (31) and a second protective wing (32) extend in the length direction of the top cover (2), the bottom of the first protective wing (31) is flush with the bottom of the top cover (2), and the top of the second protective wing (32) is flush with the top of the top cover (2), and a sealing gasket (33) is provided at the top of the first protective wing (31) and the bottom of the second protective wing (32). Multiple cover plates can be arranged in an overlapping manner to combine the first protective wing (31) and the second protective wing (32).

2. The cover plate according to claim 1, wherein: The cover plate at the leftmost end is only provided with the second protective wing (32), and the cover plate at the rightmost end is only provided with the first protective wing (31).

3. The cover plate according to claim 2, wherein: The bottom of the stop frame (1) is provided with a plurality of clamping blocks (16), and the stop frame (1) is also provided with a lower positive pole hole (11), a lower negative pole hole (12), a lower liquid injection hole (13) and an explosion-proof valve groove (14), and an exhaust channel (15) is opened on the explosion-proof valve groove (14).

4. The cover plate according to claim 3, wherein: An insulating sheet is provided between the stop frame (1) and the top cover (2), and a pole protection plate (4) is also provided on the top cover (2).

5. A battery cell, characterized in that: The cover plate according to any one of claims 1 to 4 is used.

6. The battery cell according to claim 5, characterized in that: The battery cell further comprises a battery housing (5), a top of which is provided with a plurality of mounting grooves (51), and the clamping blocks (16) of the stop frame (1) are clamped in the mounting grooves (51).

7. The battery cell according to claim 6, characterized in that: A battery coil core (52) is provided in the battery housing (5), and a positive electrode column and a negative electrode column are provided on the battery coil core (52).

8. A battery pack, characterized in that: Composed of the battery monomers described in any one of claims 5 to 7.

Images