High-rate cell cover plate for lithium battery

Abstract

The utility model discloses a high-magnification cell cover plate for a lithium battery, which comprises a plastic plate and an aluminum plate, the plastic plate is arranged at the bottom of the aluminum plate, two through holes are formed in the plastic plate, and four first through holes are formed in the aluminum plate; two injection molding plates and two pole assemblies are further included, two second through holes and clamping grooves communicated with the second through holes are formed in each injection molding plate at intervals, a plurality of limiting parts are arranged on the inner walls of the clamping grooves, each pole assembly comprises a pole plate and two poles, two sealing rings are arranged on each pole plate, the two poles are arranged on each pole plate at intervals, and the two sealing rings are arranged on each pole plate. An annular boss is arranged on the outer wall of the pole, a plurality of limiting parts matched with the limiting pieces are arranged on the annular boss, one end of the pole sequentially penetrates through the penetrating hole, the first through hole and the second through hole, and the annular boss is matched with the clamping groove. According to the utility model, the cover plate with the structure is large in over-current area, strong in current bearing capacity and suitable for a high-rate-performance battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cover plate for a high-rate battery cell of a lithium battery. Background Art

[0002] Currently, most lithium battery cover plates on the market are single-pole cover plate designs, which have problems such as small welding current flow area and low current carrying capacity. Faced with the current market's increasing requirements for battery charging and discharging speeds, the existing design is obviously unable to meet the requirements of high-rate batteries. Utility Model Content

[0003] The purpose of the utility model is to solve the above technical problems and provide a cover plate for a high-rate battery cell of a lithium battery.

[0004] The technical solution of the utility model: a cover plate for a high-rate battery cell of a lithium battery, comprising a plastic plate and an aluminum plate, wherein the plastic plate is arranged at the bottom of the aluminum plate, the plastic plate is provided with two through holes, and the aluminum plate is provided with four first through holes; further comprising an injection molding plate and a pole assembly, each of which is two in number, the injection molding plate being provided with two second through holes and a card slot communicating therewith at intervals, a plurality of limiting members being provided on the inner wall of the card slot, the pole assembly comprising a pole plate and two poles, the pole plate being provided with two sealing rings, the two poles being arranged at intervals on the pole plate, an annular boss being provided on the outer wall of the pole, a plurality of limiting portions being provided on the annular boss respectively matched with the plurality of limiting members, one end of the pole passing through the through hole, the first through hole and the second through hole in sequence, and the annular boss being matched with the card slot.

[0005] Preferably, two positioning steps are provided on the aluminum plate at intervals, and the injection molding plate is provided with step grooves matched with the positioning steps.

[0006] Preferably, the thickness of the annular boss is 2 mm-4 mm.

[0007] Preferably, two positioning plates are spaced apart on the plastic plate, and two positioning grooves respectively matched with the positioning plates are provided at the bottom of the aluminum plate.

[0008] Preferably, a pressure relief groove is provided at the bottom of the plastic plate, a plurality of rectangular holes are provided on the pressure relief groove, and a pressure relief hole, an explosion-proof plate and a film are provided on the aluminum plate, the explosion-proof plate is arranged below the pressure relief hole, and the film is arranged above the film.

[0009] Preferably, the injection molded plate is a PP plate, a PE plate or a PTFE plate.

[0010] Preferably, the sealing ring is a fluororubber sealing ring or an EPDM sealing ring.

[0011] The beneficial effects of the utility model are as follows: in the utility model, the structural cover plate can meet the high-rate charging and discharging requirements of the power battery by setting a bipolar column structure, increase the heat dissipation speed and the flow area, the flow area is large, and the current carrying capacity is strong, which is suitable for high-rate performance batteries; the setting of the limit piece and the limit part can enable the cover plate to resist a certain degree of lateral thrust and longitudinal thrust. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a stereoscopic diagram of the overall structure of the preferred embodiment of the utility model;

[0013] Figure 2 It is an exploded view of the overall structure of the preferred embodiment of the utility model;

[0014] Figure 3 It is a sectional view of the overall structure of a preferred embodiment of the utility model;

[0015] Figure 4 yes Figure 3 A partial enlarged view of the middle part;

[0016] Figure 5 It is a three-dimensional diagram of a plastic plate in a preferred embodiment of the utility model;

[0017] Figure 6 It is a three-dimensional diagram of an aluminum plate in a preferred embodiment of the utility model;

[0018] Figure 7 This is a bottom view of the aluminum plate in the preferred embodiment of the utility model;

[0019] Figure 8 It is a three-dimensional diagram of the injection molding plate in the preferred embodiment of the utility model;

[0020] Fig. 9 It is a stereoscopic diagram of a pole assembly in a preferred embodiment of the utility model.

[0021] Figure numerals: plastic plate 10, perforation 101, positioning plate 102, pressure relief groove 103, rectangular hole 1031, aluminum plate 2, first through hole 201, positioning step 202, positioning groove 203, pressure relief hole 204, explosion-proof disk 205, film 206, injection molding plate 3, second through hole 301, slot 302, limiter 3021, pole plate 4, sealing ring 401, pole 5, annular boss 501, limiter 5011. DETAILED DESCRIPTION

[0022] 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.

[0023] Reference Figures 1 to 9 A cover plate for a high-rate lithium battery cell, comprising a plastic plate 10 and an aluminum plate 2, wherein the plastic plate 10 is arranged at the bottom of the aluminum plate 2, characterized in that the plastic plate 10 is provided with two through holes 101, and the aluminum plate 2 is provided with four first through holes 201; and also comprising two injection molding plates 3 and a pole assembly, wherein the injection molding plates 3 are provided with two second through holes 301 and a slot 302 communicating therewith at intervals, and the inner wall of the slot 302 is provided with a plurality of stoppers 3021, and the pole assembly includes The invention comprises a pole plate 4 and two poles 5, wherein two sealing rings 401 are arranged on the pole plate 4, and two poles 5 are arranged on the pole plate 4 at intervals. An annular boss 501 is arranged on the outer wall of the pole 5, and a plurality of limiting portions 5011 respectively matched with a plurality of limiting members 3021 are arranged on the annular boss 501, and one end of the pole 5 passes through the through hole 101, the first through hole 201 and the second through hole 301 in sequence, and the annular boss 501 cooperates with the slot 302. In the utility model, one end of the pole 5 passes through the through hole 101, the first through hole 201 and the second through hole 301 in sequence, and the annular boss 501 cooperates with the slot 302, thereby fixing the pole assembly on the plastic plate 10 and the aluminum plate 2, and the sealing ring 401 on the pole plate 4 abuts against the bottom of the aluminum plate 2, so that the pole assembly is sealed and fixed on the plastic plate 10 and the aluminum plate 2. The number of the positive pole 5 and the negative pole 5 are both two. The cover plate of this structure has a large flow area and a strong current carrying capacity, and is suitable for high The cover plate is subjected to thrust from left to right and from top to bottom during actual use. The outer wall of the pole 5 is provided with an annular boss 501, and the annular boss 501 is provided with a plurality of longitudinal non-penetrating embossed grooves 5011. The inner wall of the slot 302 is provided with a plurality of stoppers 3021, which respectively cooperate with a plurality of stoppers 5011 to strengthen the lateral and longitudinal thrust of the bipolar column, so that the cover plate can resist a certain degree of lateral thrust and longitudinal thrust. Specifically, the pole 5 passes through the sealing ring 401; the stopper 3021 is a protrusion, which can be circular, rectangular, trapezoidal, X-shaped, N-shaped, Y-shaped, etc., and the stopper 5011 is a non-penetrating embossed groove, which can be circular, rectangular, trapezoidal, X-shaped, N-shaped, Y-shaped, etc.; the plastic plate 10 and the aluminum plate 2 are provided with injection holes.

[0024] As a preferred embodiment of the utility model, it may also have the following additional technical features:

[0025] In this embodiment, two positioning steps 202 are provided on the aluminum plate 2 at intervals, and a step groove matched with the positioning steps 202 is provided on the injection molding plate 3, so that the injection molding plate 3 will not shift after being installed on the aluminum plate 2.

[0026] In this embodiment, the thickness of the annular boss 501 is 2 mm-4 mm, preferably 3 mm.

[0027] In this embodiment, two positioning plates 102 are arranged on the plastic plate 10, and two positioning grooves 203 respectively matched with the positioning plates 102 are arranged at the bottom of the aluminum plate 2, so that the aluminum plate 2 will not move after being installed on the plastic plate 10. Specifically, a through hole communicating with the through hole 101 is arranged on the positioning plate 102.

[0028] In this embodiment, a pressure relief groove 103 is provided at the bottom of the plastic plate 10, and a plurality of rectangular holes 1031 are provided on the pressure relief groove 103. A pressure relief hole 204, an explosion-proof plate 205 and a film 206 are provided on the aluminum plate 2. The explosion-proof plate 205 is arranged below the pressure relief hole 204, and the film 206 is arranged above the film 206. When the battery box needs to release pressure, the explosion-proof plate 205 can break to release pressure.

[0029] In this embodiment, the injection molding plate 3 is a PP plate, a PE plate or a PTFE plate.

[0030] In this embodiment, the sealing ring 401 is a fluororubber sealing ring or an EPDM sealing ring.

[0031] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

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

Claims

1. A cover plate for a high-rate lithium battery cell, comprising a plastic plate (10) and an aluminum plate (2), wherein the plastic plate (10) is arranged at the bottom of the aluminum plate (2), characterized in that: The plastic plate (10) is provided with two through holes (101), and the aluminum plate (2) is provided with four first through holes (201); it also includes two injection molding plates (3) and pole assembly, each of which is provided with two second through holes (301) and a clamping groove (302) communicating therewith, the injection molding plate (3) is provided with two intervals, and the inner wall of the clamping groove (302) is provided with a plurality of stoppers (3021); the pole assembly includes a pole plate (4) and two poles (5), and the pole plate (4) is provided with two sealing rings ( 401), two poles (5) are arranged at intervals on the pole plate (4), an annular boss (501) is provided on the outer wall of the pole (5), and a plurality of limiting portions (5011) are provided on the annular boss (501) respectively matched with a plurality of limiting members (3021), one end of the pole (5) passes through the through hole (101), the first through hole (201) and the second through hole (301) in sequence, and the annular boss (501) is matched with the slot (302).

2. The cover plate for a high-rate lithium battery according to claim 1, characterized in that: The aluminum plate (2) is provided with two positioning steps (202) at intervals, and the injection molding plate (3) is provided with a step groove matched with the positioning steps (202).

3. The cover plate for a high-rate lithium battery according to claim 1, characterized in that: The thickness of the annular boss (501) is 2 mm to 4 mm.

4. The cover plate for a high-rate lithium battery according to claim 1, characterized in that: Two positioning plates (102) are arranged at intervals on the plastic plate (10), and two positioning grooves (203) respectively matched with the positioning plates (102) are arranged at the bottom of the aluminum plate (2).

5. The cover plate for a high-rate lithium battery according to claim 1, characterized in that: The bottom of the plastic plate (10) is provided with a pressure relief groove (103), and the pressure relief groove (103) is provided with a plurality of rectangular holes (1031). The aluminum plate (2) is provided with a pressure relief hole (204), an explosion-proof plate (205) and a film (206), and the explosion-proof plate (205) is arranged below the pressure relief hole (204), and the film (206) is arranged above the film (206).

6. The cover plate for a high-rate lithium battery cell according to claim 1, characterized in that: The injection molding plate (3) is a PP plate, a PE plate or a PTFE plate.

7. The cover plate for a high-rate lithium battery according to claim 1, characterized in that: The sealing ring (401) is a fluororubber sealing ring or an EPDM sealing ring.

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