Top cover and square shell battery

Abstract

The utility model relates to the technical field of square shell battery assembly, in particular to a top cover and a square shell battery, the top cover comprises a cover plate, an insulating layer arranged at the bottom of the cover plate and electrode terminal combinations arranged at the two ends of the cover plate; the two ends of the bottom of the insulating layer are provided with a first positioning column used for positioning the positive electrode adapter plate and a second positioning column used for positioning the negative electrode adapter plate respectively. The square-shell battery is formed by assembling a top cover, a shell and a battery cell, a cover plate and the battery cell are separated through an insulating layer, short circuit is prevented, during assembling, a first positioning column and a second positioning column are used for fixing the positions of a positive electrode adapter plate and a negative electrode adapter plate respectively, and then the battery cell is conducted through electrode terminal combinations at the two ends of the cover plate. According to the utility model, the battery assembly is assisted by positioning, so that the assembly difficulty caused by rebound of the positive electrode adapter sheet and the negative electrode adapter sheet can be prevented, and the assembly efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of square cell assembly, more particularly to a top cover and square cell. BACKGROUND

[0002] Square cells have an absolute position in the power market due to their large capacity and simple grouping advantages. The top cover of the power cell is the core part of the cell shell, which generally includes a cover plate and a pole post connected to the cover plate. The pole post is connected to the pole lug of the cell through a connecting sheet to realize the charging and discharging function. With the development of new energy, the market requires higher energy density and rate performance of power cells.

[0003] The prior art discloses a square laminated battery, which comprises a combined cover plate, a laminated body assembly, an insulating film and an aluminum shell. The laminated body assembly comprises a pole group, and the two sides of the pole group are respectively provided with a positive pole lug and a negative pole lug. An electrode output connection assembly is mounted on the positive pole lug and the negative pole lug. The electrode output connection assembly is bent. The combined cover plate comprises a top cover plate, and a plurality of electrode combination terminals are mounted on the top cover plate. An insulating thrust piece is arranged on one side of the laminated body assembly. The electrode output connection assembly comprises an electrode output terminal and an electrode connecting sheet connected to the electrode output terminal. One end of the electrode connecting sheet connected to the electrode output terminal is bent. An electrode cylindrical hole is arranged on the electrode combination terminal, and one end of the electrode output terminal is located in the electrode cylindrical hole. The electrode output terminal is sealed and laser welded in the electrode cylindrical hole. In this scheme, the electrode output connection assembly and the electrode connecting sheet are bent to reduce the volume of the battery, save space, and improve the volume specific energy of the battery. However, due to the bending of the electrode output connection assembly, especially when the number of pole groups increases, the positive pole lug and the negative pole lug are thickened, and the electrode connecting sheet connected to the positive pole lug and the negative pole lug is prone to rebound, resulting in difficult battery assembly and low assembly efficiency. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the deficiency of difficult battery assembly in the prior art, and provides a top cover and square cell, which can assist battery assembly through positioning during battery assembly, reduce the difficulty of battery assembly, and improve the assembly efficiency.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of:

[0006] A top cover is provided, which comprises a cover plate, an insulating layer arranged at the bottom of the cover plate, and an electrode terminal combination arranged at both ends of the cover plate. The bottom of the insulating layer is provided with a first positioning column for positioning the positive adapter sheet and a second positioning column for positioning the negative adapter sheet at both ends.

[0007] The utility model discloses a top cover for assembling into square shell battery with shell and electric core, and the top cover comprises a cover plate and an insulating layer, the cover plate is separated from the electric core through the insulating layer to prevent short circuit, and during assembly, the first positioning column and the second positioning column are used to position and fix the positive pole adapter piece and the negative pole adapter piece respectively, and then the electrode terminal combination at both ends of the cover plate is used to conduct the electric core.

[0008] Further, each electrode terminal combination comprises a pole, an insulating piece and a pressing piece, both ends of the insulating layer are respectively provided with a first through hole, both ends of the cover plate are respectively provided with a second through hole corresponding to the first through hole, the insulating piece is provided with a third through hole corresponding to the second through hole, one end of the pole sequentially passes through the corresponding first through hole, second through hole and third through hole and is connected to the pressing piece, the top of the insulating piece is connected between the pressing piece and the cover plate, and the bottom of the insulating piece is located between the inner wall of the second through hole and the pole.

[0009] Further, the electrode terminal combination further comprises a sealing ring, the bottom of the second through hole is communicatively provided with a groove, the pole is arranged in the sealing ring, the pole is provided with a step, and the step extrudes the sealing ring in the groove.

[0010] Further, the pressing piece and the pole are riveted and then welded.

[0011] Further, the cover plate is provided with a protective film, the insulating layer and the cover plate are both provided with a liquid injection hole, the insulating layer is provided with an explosion-proof valve, the explosion-proof valve is located directly below the protective film, and the explosion-proof valve is located between the first positioning column and the second positioning column.

[0012] Further, the insulating layer and the cover plate are prepared into an integrated structure through an electrochemical deposition process, and the thickness of the insulating layer is 1mm-2mm.

[0013] The utility model discloses further provide a square shell battery, including shell, integrated in the electric core of shell and above-mentioned top cover, the electric core includes electric core body, positive pole lug, negative pole lug, positive pole adapter piece and negative pole adapter piece, the positive pole lug and negative pole lug are arranged at both sides of electric core body respectively, the positive pole adapter piece and negative pole adapter piece are bent and set, the positive pole adapter piece is connected with the pole of one end of cover plate to the positive pole lug, the negative pole adapter piece is connected with the pole of the other end of cover plate to the negative pole lug, the positive pole adapter piece is provided with first positioning hole, the negative pole adapter piece is provided with second positioning hole, the first positioning column is cooperated with first positioning hole, and the second positioning column is cooperated with second positioning hole.

[0014] The utility model discloses a square cell, when assembling, the positive pole lug and the negative pole lug are prewelded respectively, the positive pole adapter piece and the negative pole adapter piece are main welded with the positive pole lug and the negative pole lug respectively, the positive pole adapter piece and the positive pole lug, the negative pole adapter piece and the negative pole lug are bent, and the volume of the cell body is reduced to improve the energy density of the cell.

[0015] Further, the positive pole adapter piece includes a vertically arranged positive pole lug welding area and a positive pole post welding area, the positive pole lug welding area is connected with the positive pole lug, the positive pole post welding area is connected with the pole post at one end of the cover plate, and the first positioning hole is arranged in the positive pole post welding area; the negative pole adapter piece includes a vertically arranged negative pole lug welding area and a negative pole post welding area, the negative pole lug welding area is connected with the negative pole lug, the negative pole post welding area is connected with the pole post at the other end of the cover plate, and the second positioning hole is arranged in the negative pole post welding area.

[0016] Further, the positive pole lug and the negative pole lug extend from the bottom end of the cell body to the top end of the cell body.

[0017] Further, it further includes an insulating film, and the insulating film is wrapped on the outer wall of the cell.

[0018] Compared with the prior art, the utility model discloses the following beneficial effects:

[0019] Through the positioning auxiliary battery assembly, the difficulty of assembly caused by the rebound of the positive pole adapter piece and the negative pole adapter piece can be prevented, and the assembly efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the explosion schematic view of the top cover in the utility model embodiment;

[0021] Figure 2 It is the structure schematic view of the top cover in the utility model embodiment;

[0022] Figure 3 It is the schematic view of square cell assembly in the utility model embodiment;

[0023] Figure 4 It is the structure schematic view of square cell in the utility model embodiment;

[0024] Figure 5 For Figure 4 Enlarged view of the middle part A;

[0025] Figure 6 For the structure diagram of the battery cell in the embodiment of the utility model.

[0026] In the drawing: 1-cover plate; 101-second through hole; 102-groove; 103-protection film; 2-insulating layer; 201-first through hole; 202-explosion-proof valve; 203-liquid injection hole; 3-first positioning column; 4-second positioning column; 5-pole column; 501-step; 6-sealing ring; 7-insulating piece; 701-third through hole; 8-pressing piece; 9-housing; 10-battery cell body; 11-positive electrode tab; 12-negative electrode tab; 13 positive electrode adapter plate; 1301 positive electrode tab welding area; 1302 positive electrode column welding area; 1303 first positioning hole; 14-negative electrode adapter plate; 1401-negative electrode tab welding area; 1402-negative electrode column welding area; 1403-second positioning hole; 15-insulating film. DETAILED DESCRIPTION

[0027] The utility model will be further described below in combination with specific implementation manners. Among them, the drawing is only used for example description, and the representation is only schematic diagram, and cannot be understood as the limitation of the patent; in order to better illustrate the embodiment of the utility model, some components of the drawing will be omitted, enlarged or reduced, and the size of actual product is not represented; for those skilled in the art, it is understandable that some well-known structures in the drawing and their description can be omitted.

[0028] The same or similar reference numerals in the drawings of the embodiment of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" etc. is based on the orientation or position relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore the position relationship description in the drawing is only used for example description, and cannot be understood as the limitation of the patent, for the ordinary skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0029] Embodiment one

[0030] The first embodiment of the top cover, as shown in Figures 1 to 5 It includes cover plate 1, insulating layer 2 arranged at the bottom of cover plate 1 and electrode terminal combination arranged at both ends of cover plate 1; the bottom of insulating layer 2 is respectively provided with first positioning column 3 for positioning positive electrode adapter plate 13 and second positioning column 4 for positioning negative electrode adapter plate 14.

[0031] The top cover is used for assembling the square cell battery with the shell 9 and the battery cell, and comprises the cover plate 1 and the insulation layer 2, the cover plate 1 is separated from the battery cell by the insulation layer 2 to prevent short circuit, during assembly, the first positioning column 3 and the second positioning column 4 are used to respectively fix the position of the positive transition sheet 13 and the negative transition sheet 14, and then the electrode terminal combination at both ends of the cover plate 1 is used to conduct the battery cell. The embodiment can prevent the assembly difficulty caused by the rebound of the positive transition sheet 13 and the negative transition sheet 14, and improve the assembly efficiency by positioning auxiliary battery assembly.

[0032] As shown in Figures 1 to 3 , Figure 5 , each electrode terminal combination comprises the pole 5, the insulation piece 7 and the compression sheet 8, both ends of the insulation layer 2 are respectively provided with the first through hole 201, both ends of the cover plate 1 are respectively provided with the second through hole 101 corresponding to the first through hole 201, the insulation piece 7 is provided with the third through hole 701 corresponding to the second through hole 101, one end of the pole 5 sequentially passes through the corresponding first through hole 201, the second through hole 101 and the third through hole 701 and is connected to the compression sheet 8, the top of the insulation piece 7 is connected between the compression sheet 8 and the cover plate 1, and the bottom of the insulation piece 7 is located between the inner wall of the second through hole 101 and the pole 5. During implementation, the pole 5 conducts the compression sheet 8 and the battery cell, at the same time, the insulation layer 2 separates the battery cell and the cover plate 1, the bottom of the insulation piece 7 separates the pole 5 and the cover plate 1, and the top of the insulation piece 7 separates the compression sheet 8 and the cover plate 1 to prevent short circuit.

[0033] As shown in Figure 1 , Figure 4 and Figure 5 , the electrode terminal combination further comprises the sealing ring 6, the bottom of the second through hole 101 is provided with the groove 102 in communication, the pole 5 is provided in the sealing ring 6, the pole 5 is provided with the step 501, and the step 501 extrudes the sealing ring 6 in the groove 102. During implementation, one end of the pole 5 sequentially passes through the first through hole 201, the sealing ring 6, the second through hole 101 and the third through hole 701 and is connected to the compression sheet 8, the compression sheet 8 is riveted with the pole 5 and then is welded, the step 501 and the groove 102 cooperate to compress the sealing ring 6 in the axial direction, and the sealing ring 6 is tightly sealed to the cover plate 1 in the radial direction. At the same time, the sealing ring 6 and the insulation layer 2 can reduce the insulation structure provided between the insulation layer 2 and the cover plate 1 in the prior art, can effectively reduce the top space, and increase the energy density of the battery cell.

[0034] As shown in Figure 1 , Figure 3As shown, the cover plate 1 is provided with a protective film 103, the insulation layer 2 and the cover plate 1 are both provided with a liquid injection hole 203, the insulation layer 2 is provided with an explosion-proof valve 202, the explosion-proof valve 202 is located directly below the protective film 103, and the explosion-proof valve 202 is located between the first positioning column 3 and the second positioning column 4. The explosion-proof valve 202 can realize rapid pressure relief inside the battery and improve the safety of the battery.

[0035] Embodiment two

[0036] This embodiment is a second embodiment of the top cover, which is similar to embodiment one, except that the insulation layer 2 and the cover plate 1 are prepared as an integrated structure by an electrochemical deposition process, and the thickness of the insulation layer 2 is 1mm-2mm. Specifically, a polystyrene prepolymer is prepared at 140℃-150℃; a modified epoxy resin is generated by reacting the polystyrene prepolymer with an epoxy resin and a chain extender; a coating with a solid content of 33%-37% is prepared by mixing the modified epoxy resin with a curing agent and a film-forming agent; and the coating is deposited on the bottom of the cover plate 1 by a secondary electrophoresis process and is baked and cured to form the insulation layer 2. The insulation layer 2 is relatively thin, which can further reduce the volume of the top space and increase the energy density of the battery cell.

[0037] Embodiment three

[0038] This embodiment is a first embodiment of a square shell battery, as shown in Figure 3 , Figure 4 and Figure 6 , which includes a shell 9, a battery cell integrated in the shell 9, and the top cover of embodiment one or embodiment two. The battery cell includes a battery cell body 10, a positive electrode tab 11, a negative electrode tab 12, a positive electrode adapter 13, and a negative electrode adapter 14. The positive electrode tab 11 and the negative electrode tab 12 are respectively arranged on both sides of the battery cell body 10. The positive electrode adapter 13 and the negative electrode adapter 14 are bent and arranged. The positive electrode adapter 13 connects the positive electrode tab 11 with the pole 5 at one end of the cover plate 1. The negative electrode adapter 14 connects the negative electrode tab 12 with the pole 5 at the other end of the cover plate 1. The positive electrode adapter 13 is provided with a first positioning hole 1303, and the negative electrode adapter 14 is provided with a second positioning hole 1403. The first positioning column 3 cooperates with the first positioning hole 1303, and the second positioning column 4 cooperates with the second positioning hole 1403.

[0039] The square shell battery is assembled by pre-welding the positive and negative tabs 11 and 12 respectively, main welding the positive and negative adapter tabs 13 and 14 with the positive and negative tabs 11 and 12 respectively, bending the positive and negative adapter tabs 13 and 14 and the positive and negative tabs 11 and 12 to reduce the size of the battery cell and improve the energy density of the battery cell, assembling the battery cell with the top cover and the shell, welding the positive and negative adapter tabs 13 and 14 with the positive and negative posts 5 at both ends of the top cover, aligning the first and second positioning columns 3 and 4 with the first and second positioning holes 1303 and 1403, and positioning the positive and negative adapter tabs 13 and 14 to prevent the stress from being too large due to the bending of the positive and negative adapter tabs 13 and 14 and the positive and negative tabs 11 and 12, thereby reducing the assembly difficulty and improving the assembly efficiency. One end of the post 5 sequentially passes through the first, second and third through holes 201, 101 and 701 and is connected to the compression sheet 8. The compression sheet 8 is riveted with the post 5 and then welded to realize the charging and discharging function.

[0040] As shown in Figure 3 , Figure 4 and Figure 6 , the positive adapter tab 13 includes a vertically arranged positive tab welding area 1301 and a positive post welding area 1302. The positive tab welding area 1301 is connected with the positive tab 11, and the positive post welding area 1302 is connected with the post 5 at one end of the cover plate 1. The first positioning hole 1303 is arranged in the positive post welding area 1302. The negative adapter tab 14 includes a vertically arranged negative tab welding area 1401 and a negative post welding area 1402. The negative tab welding area 1401 is connected with the negative tab 12, and the negative post welding area 1402 is connected with the post 5 at the other end of the cover plate 1. The second positioning hole 1403 is arranged in the negative post welding area 1402. In the implementation, the positive and negative tab welding areas 1301 and 1401 are welded with the positive and negative tabs 11 and 12 respectively, and then the positive and negative tab welding areas 1301 and 1401 and the positive and negative tabs 11 and 12 are bent along the thickness direction of the battery cell body 10. Then the positive and negative post welding areas 1302 and 1402 are folded and welded respectively, so that the positive tab welding area 1301 and the positive post welding area 1302 are perpendicular to each other, the negative tab welding area 1401 and the negative post welding area 1402 are perpendicular to each other, and the folded parts are flush with the top of the battery cell body 10, thereby reducing the length of the battery.

[0041] As shown in Figure 4 , it further includes an insulating film 15 wrapped on the outer wall of the battery cell. The insulating film 15 effectively isolates the battery cell from the external environment, protects the battery cell, prevents short circuit and current leakage of the battery cell, and improves the safety of the battery.

[0042] As shown in Figure 6As shown, the positive tab 11 and the negative tab 12 both extend from the bottom end of the cell body 10 to the top end of the cell body 10. The full-tab design increases the overcurrent area of the positive tab 11 and the negative tab 12, thereby improving the current carrying capacity and further improving the charge-discharge rate. The full-tab design also makes the temperature field distribution of the positive tab 11 and the negative tab 12 more uniform, reduces the temperature rise of the positive tab 11 and the negative tab 12, and reduces the breakage of the positive tab 11 and the negative tab 12, thereby improving the consistency and safety of the battery.

[0043] In the specific contents of the above specific embodiments, each technical feature can be combined arbitrarily without contradiction. In order to make the description simple, all possible combinations of the above technical features are not described, but as long as the combination of the technical features does not exist contradiction, it should be considered as the scope of the present disclosure.

[0044] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other different forms of changes or modifications can be made on the basis of the above description. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A top cover, comprising a cover plate (1), an insulating layer (2) disposed at the bottom of the cover plate (1), and electrode terminal assemblies disposed at both ends of the cover plate (1); characterized in that, The bottom ends of the insulating layer (2) are respectively provided with a first positioning post (3) for positioning the positive electrode adapter piece (13) and a second positioning post (4) for positioning the negative electrode adapter piece (14).

2. The top cover according to claim 1, characterized in that, Each electrode terminal assembly includes a pole (5), an insulating element (7), and a pressing sheet (8). The insulating layer (2) has a first through hole (201) at both ends, and the cover plate (1) has a second through hole (101) at both ends corresponding to the first through hole (201). The insulating element (7) has a third through hole (701) corresponding to the second through hole (101). One end of the pole (5) passes through the corresponding first through hole (201), second through hole (101), and third through hole (701) in sequence and is connected to the pressing sheet (8). The top of the insulating element (7) is connected between the pressing sheet (8) and the cover plate (1), and the bottom of the insulating element (7) is located between the inner wall of the second through hole (101) and the pole (5).

3. The top cover according to claim 2, characterized in that, The electrode terminal assembly also includes a sealing ring (6), and a groove (102) is provided at the bottom of the second through hole (101). The pole post (5) passes through the sealing ring (6), and the pole post (5) is provided with a step (501). The step (501) presses the sealing ring (6) into the groove (102).

4. The top cover according to claim 2, characterized in that, The pressing sheet (8) is riveted to the pole (5) and then welded.

5. The top cover according to claim 1, characterized in that, The cover plate (1) is provided with a protective film (103). Both the insulating layer (2) and the cover plate (1) are provided with injection holes (203). The insulating layer (2) is provided with an explosion-proof valve (202). The explosion-proof valve (202) is located directly below the protective film (103) and is located between the first positioning post (3) and the second positioning post (4).

6. The top cover according to any one of claims 1 to 5, characterized in that, The insulating layer (2) and the cover plate (1) are prepared as an integral structure by electrochemical deposition process, and the thickness of the insulating layer (2) is 1mm to 2mm.

7. A prismatic battery, characterized in that, The device includes a housing (9), a battery cell integrated within the housing (9), and a top cover as described in any one of claims 1 to 6. The battery cell includes a battery cell body (10), a positive electrode tab (11), a negative electrode tab (12), a positive electrode adapter (13), and a negative electrode adapter (14). The positive electrode tab (11) and the negative electrode tab (12) are respectively disposed on both sides of the battery cell body (10). The positive electrode adapter (13) and the negative electrode adapter (14) are bent. The positive electrode adapter (13) is connected to the... The positive electrode tab (11) is connected to the pole post (5) at one end of the cover plate (1), and the negative electrode adapter (14) connects the negative electrode tab (12) to the pole post (5) at the other end of the cover plate (1). The positive electrode adapter (13) has a first positioning hole (1303), and the negative electrode adapter (14) has a second positioning hole (1403). The first positioning post (3) cooperates with the first positioning hole (1303), and the second positioning post (4) cooperates with the second positioning hole (1403).

8. The prismatic battery according to claim 7, characterized in that, The positive electrode adapter (13) includes a vertically arranged positive electrode tab welding area (1301) and a positive electrode post welding area (1302). The positive electrode tab welding area (1301) is connected to the positive electrode tab (11), and the positive electrode post welding area (1302) is connected to the electrode post (5) at one end of the cover plate (1). The first positioning hole (1303) is opened in the positive electrode post welding area (1302). The negative electrode adapter (14) includes a vertically arranged negative electrode tab welding area (1401) and a negative electrode post welding area (1402). The negative electrode tab welding area (1401) is connected to the negative electrode tab (12), and the negative electrode post welding area (1402) is connected to the electrode post (5) at the other end of the cover plate (1). The second positioning hole (1403) is opened in the negative electrode post welding area (1402).

9. The prismatic battery according to claim 7, characterized in that, Both the positive electrode tab (11) and the negative electrode tab (12) extend from the bottom end of the cell body (10) to the top end of the cell body (10).

10. The prismatic battery according to claim 7, characterized in that, It also includes an insulating film (15) that covers the outer wall of the battery cell.

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