Lithium battery and assembly method

Abstract

A lithium battery and assembly method of the present invention include a housing, a battery cell, a positive electrode cover plate, a positive electrode insulating sheet, a positive electrode current collecting structure, and a negative electrode current collecting structure. The housing is a hollow cylindrical tube, the positive end is open, the negative end is closed, and an assembly through-hole A is provided at the center of the surface of the negative end. The positive electrode cover plate is mounted on the positive electrode current collecting structure, and the positive electrode insulating sheet is mounted on the positive electrode current collecting structure and is located between the positive electrode cover plate and the positive electrode current collecting structure. The positive electrode surface of the battery cell is welded to the positive electrode current collecting structure, and the negative electrode surface of the battery cell is welded to the negative electrode current collecting structure. The negative electrode current collecting structure is connected to the negative end of the housing through the assembly through-hole A. The beneficial effects of the present invention are embodied in that: the current collecting post is arranged on the current collecting disk, which strengthens the connection between the current collecting post and the current collecting disk, further reduces the internal resistance of the battery and increases the current; and the insulating sheet and cover plate are directly mounted on the current collecting post, which reduces the welding steps and simplifies the process flow.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium batteries, relates to lithium battery assembly technology, and specifically relates to a lithium battery and an assembly method. Background Art

[0002] Lithium batteries use lithium metal or lithium alloys as the negative electrode, manganese dioxide as the positive electrode, and lithium salt dissolved in an organic solvent as the electrolyte. Due to their high current, high energy density, and long life, lithium batteries stand out among many other battery types and are widely used in various devices in various scenarios.

[0003] Most existing lithium batteries use a current collecting post installed on the cover, a current collecting disc welded to the battery cell, and then the current collecting disc welded to the current collecting post to form a single piece. In this assembly method, the cover and the current collecting post are fixed together by rivets, and the connection is filled with insulating material, which makes the process complex. The reliability of the welding between the current collecting post and the current collecting disc also needs to be considered. Poor welding can increase the battery resistance and even lose the electrical connection between the current collecting post and the current collecting disc, making the battery unusable. In addition, most existing lithium batteries are two-pole lithium batteries with two poles at both ends. Both the positive and negative poles require welding the battery cell, current collecting disc, and cover. This requires many welding operations, which reduces the assembly efficiency of the lithium battery.

[0004] The existing method for welding the collector plate to the battery cell is to place the cell tabs against the lower surface of the collector plate and then use laser welding to spot weld the contacts on the upper surface of the collector plate. Because the tabs are located below the collector plate, spot welding from above puts the tabs in a blind spot, making them prone to poor contact and welding. Furthermore, since the tab positions cannot be accurately determined, it is often impossible to fully weld the tabs to the collector plate, resulting in high battery resistance and a reduced discharge current. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, the present invention provides a lithium battery, which adopts the following technical solutions:

[0006] A lithium battery, comprising:

[0007] a housing having a positive terminal and a negative terminal;

[0008] A battery cell having a positive side and a negative side;

[0009] positive electrode cover;

[0010] Positive electrode insulation sheet;

[0011] A current collecting structure, comprising a positive electrode current collecting structure and a negative electrode current collecting structure;

[0012] The housing is a hollow cylindrical tube, the positive end is open, the negative end is closed, and an assembly through hole A is provided in the center of the negative end surface;

[0013] The current collecting structure includes a current collecting plate and a current collecting column, wherein the current collecting column is arranged at the center of the current collecting plate and is integrally connected to the current collecting plate;

[0014] Wherein, the positive electrode cover plate is installed on the positive electrode current collecting structure and is used to seal the positive end of the shell;

[0015] The positive electrode insulating sheet is installed on the positive electrode current collecting structure and is located between the positive electrode cover plate and the positive electrode current collecting structure;

[0016] The positive electrode surface of the battery cell is welded to the positive electrode current collecting structure, and the negative electrode surface of the battery cell is welded to the negative electrode current collecting structure;

[0017] Wherein, the negative electrode current collecting structure is connected to the negative end of the shell through the assembly through hole A;

[0018] Preferably, the current collecting plate further comprises long arc holes, which are used for the pole tabs to pass through, and the distribution positions of the long arc holes correspond to the pole tabs one by one;

[0019] Preferably, the width of the long arc hole is 1 mm and the length is 5 mm;

[0020] Preferably, the positive electrode current collecting column includes a first groove and a second groove, and the negative electrode current collecting column includes a third groove;

[0021] The first groove is used to assemble the positive electrode cover plate, the second groove is used to assemble the positive electrode insulating sheet, and the third groove is used to assemble the negative end of the shell;

[0022] Wherein, the distance between the first groove and the second groove is 2 mm;

[0023] Preferably, the battery cell includes:

[0024] A positive electrode sheet including a positive conductive layer and a positive electrode ear;

[0025] A negative electrode sheet including a negative electrode conductive layer and a negative electrode ear;

[0026] a diaphragm having a diaphragm width direction, wherein the diaphragm width direction includes a positive direction and a negative direction;

[0027] The positive electrode sheet, diaphragm and negative electrode sheet are wound in sequence to form a battery cell;

[0028] The positive electrode conductive layer is arranged outside the positive electrode sheet, and the positive electrode tab is led out in the positive direction; the negative electrode conductive layer is arranged outside the negative electrode sheet, and the negative electrode tab is led out in the negative direction;

[0029] Preferably, the positive electrode cover plate includes:

[0030] A mounting through hole B having an insulating portion;

[0031] A through hole C is used to inject electrolyte into the battery;

[0032] a blind hole D, which can be destroyed when necessary to inject electrolyte into the battery for a second time;

[0033] An explosion-proof hole with a weak area, wherein the explosion-proof hole is a blind hole;

[0034] Wherein, the insulating portion is an insulating material coating, and the coating is provided on the inner wall of the assembly through hole B and extends along the assembly through hole B toward the upper and lower surfaces of the positive electrode cover plate;

[0035] Wherein, the weak area is a cross-shaped milling groove;

[0036] Wherein, the assembly through hole B is located at the center of the positive electrode cover;

[0037] Wherein, the through hole C, the blind hole D and the explosion-proof hole are not connected to each other;

[0038] Preferably, the coating extends along the assembly through hole B to the upper and lower surfaces of the positive electrode cover plate by a distance of 3 mm;

[0039] Preferably, the positive electrode insulating sheet includes an assembly through hole E, a through hole F, a through hole G and a through hole H, and the positions of the through hole F, the through hole G and the through hole H correspond one to one with the through hole C, the blind hole D and the explosion-proof hole;

[0040] An assembly method for assembling a lithium battery, characterized by comprising the following steps:

[0041] S1: The negative electrode current collecting structure is welded to the negative end of the battery cell, and the positive electrode current collecting structure is welded to the positive end of the battery cell;

[0042] S2: The positive electrode insulating sheet is installed on the second groove of the positive electrode current collecting column;

[0043] S3: The positive electrode cover is installed on the first groove of the positive electrode current collecting column;

[0044] S4: The negative end of the cell is inserted into the outer shell, and the negative end of the outer shell is installed on the third groove of the negative current collecting column;

[0045] S5: welding the edge of the positive electrode cover plate to the positive end of the shell;

[0046] Preferably, after step S5, the gaps between the positive electrode current collecting structure, the negative electrode current collecting structure and the housing connected by the assembly through-holes A and B are insulated and cured using an epoxy resin composition.

[0047] The beneficial effects of the present invention are reflected in that, a lithium battery is provided, in which a current collecting post is arranged on a current collecting disk, the connection between the current collecting post and the current collecting disk is strengthened, and the internal resistance of the battery is further reduced to increase the current; the negative electrode insulating sheet is eliminated, the negative electrode current collecting structure is directly connected to the outer shell, and the positive electrode edge sheet and the positive electrode cover plate are directly installed on the positive electrode current collecting structure, which reduces the welding steps, simplifies the process flow and reduces the cost; by providing an arc hole on the current collecting disk for the pole ear to pass through, the pole ear can pass through the arc hole and be welded to the current collecting disk above the current collecting disk, which is simpler and easier to operate, and the visual welding makes the connection between the pole ear and the current collecting disk more precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 Shows an exploded view of the lithium battery assembly relationship according to the invention;

[0049] Figure 2 Shown from Figure 1 Schematic diagram of the positive electrode current collecting structure;

[0050] Figure 3 Shown from Figure 1 Schematic diagram of the negative electrode current collecting structure;

[0051] Figure 4 Shown from Figure 1 Schematic diagram of the battery cell part;

[0052] Figure 5 Shown from Figure 1 Schematic diagram of the positive electrode cover;

[0053] Figure 6 Shown from Figure 1 Schematic diagram of the insulation sheet. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0055] See also Figure 1-6 As shown, the specific embodiments provided by the present invention are as follows:

[0056] Example 1:

[0057] A lithium battery, comprising:

[0058] a housing 1 having a positive terminal and a negative terminal;

[0059] A battery cell 2 having a positive electrode surface and a negative electrode surface;

[0060] Positive electrode cover 3;

[0061] Positive electrode insulating sheet 4;

[0062] The positive electrode current collecting structure 5 includes a positive electrode current collecting disc 51 and a positive electrode current collecting column 52;

[0063] The negative electrode current collecting structure 6 includes a negative electrode current collecting plate 61 and a negative electrode current collecting column 62;

[0064] The housing 1 is a hollow cylindrical tube, the positive end is open, the negative end is closed, and an assembly through hole A is provided in the center of the negative end surface;

[0065] The positive electrode current collecting column 52 is provided at the center of the positive electrode current collecting disc 51 and is integrally connected to the positive electrode current collecting disc 51;

[0066] The negative electrode current collecting column 62 is provided at the center of the negative electrode current collecting disc 61 and is integrally connected to the negative electrode current collecting disc 61;

[0067] The positive electrode cover plate 3 is mounted on the positive electrode current collecting column 52 and is used to seal the positive end of the housing 1;

[0068] The positive electrode insulating sheet 4 is installed on the positive electrode current collecting column 52 and is located between the positive electrode cover plate 3 and the positive electrode current collecting plate 51;

[0069] The positive electrode surface of the battery cell 2 is welded to the positive electrode current collecting plate 51, and the negative electrode surface of the battery cell 2 is welded to the negative electrode current collecting plate 61;

[0070] The negative electrode current collecting structure 6 is connected to the negative terminal of the shell 1 through the assembly through hole A.

[0071] The current collecting posts and collecting plates of lithium batteries are connected by welding. If the welding effect is poor, the battery resistance will increase or even the electrical connection between the current collecting posts and the collecting plate will be lost, making the battery unusable. Both the positive and negative terminals require welding of the battery cells, collecting plates and cover plates. The number of welding operations is large, which reduces the assembly efficiency of lithium batteries.

[0072] In this embodiment, the present invention provides a lithium battery, which is provided with a current collecting structure, in which the positive electrode cover plate and the positive electrode insulating sheet are both installed on the positive electrode current collecting structure, and the negative electrode current collecting structure is directly connected to the outer shell through the assembly through hole A, thereby omitting a large number of welding steps, improving assembly efficiency, and reducing costs; and the current collecting structure includes a current collecting column and a current collecting disk, which are self-contained and have a simple process, thereby avoiding the problem of insufficient welding area due to problems such as welding process errors when welding the current collecting column and the collecting disk, thereby increasing resistance and reducing efficiency.

[0073] Example 2:

[0074] The positive electrode current collecting disc 51 and the negative electrode current collecting disc 61 both include long arc holes 7 , which are used for the electrode tabs to pass through, and the distribution positions of the long arc holes 7 correspond to the electrode tabs one by one.

[0075] Existing technology places the cell tabs against the bottom surface of the collector tray, then uses laser welding to spot-weld the contacts to the top surface. Because the tabs are located below the collector tray, spot welding from above puts them in a blind spot, making them vulnerable to poor alignment and welding. Furthermore, since it's difficult to accurately determine the tab's position, it's often impossible to fully weld the tabs to the collector tray, resulting in higher battery resistance and lower discharge current.

[0076] In this embodiment, the current collecting plate is provided with an elongated arc hole, through which the tab passes and is folded against the upper surface of the current collecting plate. Spot welding can be performed directly on the upper surface of the current collecting plate. Spot welding on the upper surface of the current collecting plate is simple to perform, and the visual welding process makes the connection between the tab and the current collecting plate more precise.

[0077] Preferably, the long arc hole 8 has a width of 7 mm and a length of 5 mm.

[0078] Example 3:

[0079] The positive electrode current collecting column 52 includes a first groove 521 and a second groove 522 , and the negative electrode current collecting column 62 includes a third groove 621 ;

[0080] The first groove 521 is used to assemble the positive electrode cover 3, the second groove 522 is used to assemble the positive electrode insulating sheet 4, and the third groove 621 is used to assemble the negative end of the shell;

[0081] The distance between the first groove 521 and the second groove 522 is 2 mm.

[0082] In this embodiment, a groove is provided in the current collecting post, ensuring a more secure connection between the collecting post, the cover plate, the insulating sheet, and the outer casing. During battery use, internal electrolyte reactions generate gas, causing the battery to swell. This is why a pressure relief valve is often installed on the positive electrode cover. The positive electrode cover and the positive insulating sheet are fixed and tightly fitted relative to each other. This allows the safety valve to react and activate immediately when internal pressure increases, enhancing battery safety.

[0083] Example 4:

[0084] The battery cell 2 includes:

[0085] A positive electrode sheet 21 including a positive conductive layer 211 and a positive electrode tab 212;

[0086] A negative electrode sheet 22 including a negative electrode conductive layer 221 and a negative electrode tab 222;

[0087] A diaphragm 23 having a diaphragm width direction, wherein the diaphragm width direction includes a positive direction and a negative direction;

[0088] The positive electrode sheet 21, the diaphragm 23 and the negative electrode sheet 22 are wound in sequence to form the battery cell 2;

[0089] The positive conductive layer 211 is disposed outside the positive electrode sheet 21 and leads out the positive electrode tab 212 in the positive direction. The negative conductive layer 221 is disposed outside the negative electrode sheet 22 and leads out the negative electrode tab 222 in the negative direction.

[0090] Existing lithium batteries often leave a channel in the center of the battery cell so that the welding head can be inserted into the channel during assembly to weld the negative electrode collector plate to the outer shell.

[0091] In this embodiment, the present invention provides a lithium battery cell. Since the negative electrode current collecting structure and the shell are not welded through the cell, but are connected through the assembly through-hole A, no welding through-hole is left in the center of the cell, and the winding is tighter, which improves the energy density of the cell and has a higher battery capacity under the same battery volume.

[0092] Example 5:

[0093] The positive electrode cover plate 3 includes:

[0094] A mounting through hole B31 having an insulating portion 311;

[0095] A through hole C32 is used to inject electrolyte into the battery;

[0096] a blind hole D33, wherein the blind hole D33 can be destroyed when necessary to inject electrolyte into the battery for a second time;

[0097] An explosion-proof hole 34 having a weak portion 341, wherein the explosion-proof hole 34 is a blind hole;

[0098] The insulating portion 311 is an insulating material coating, which is provided on the inner wall of the assembly through hole B31 and extends along the assembly through hole B31 toward the upper and lower surfaces of the positive electrode cover plate 3;

[0099] Wherein, the weak portion 341 is a cross-shaped milling groove;

[0100] The assembly through hole B31 is located at the center of the positive electrode cover plate 3;

[0101] The through hole B32, the blind hole C33 and the explosion-proof hole 34 are not connected to each other.

[0102] In this embodiment, the present invention provides a positive electrode cover plate for a lithium battery, comprising an assembly through-hole B, a through-hole C, a blind hole D, and an explosion-proof hole, for performing assembly, liquid injection, secondary liquid injection, and overpressure detection. An insulating coating is applied to the inner wall of assembly through-hole B and to the surface extending upward and downward from assembly through-hole B toward the positive electrode cover plate, ensuring absolute insulation between the current collecting column and the positive electrode cover plate. A weak area, namely a cross-shaped milling groove, is provided in the explosion-proof hole. This weak area is more susceptible to rupture due to external forces than other areas. This allows the explosion-proof hole to react more quickly to internal overpressure expansion in the battery, thereby improving battery safety.

[0103] Preferably, the coating extends along the assembly through hole B to the upper and lower surfaces of the positive electrode cover plate by a distance of 3 mm.

[0104] Example 6:

[0105] The positive electrode insulating sheet 4 includes an assembly through hole E41 , a through hole F42 , a through hole G43 and a through hole H44 . The positions of the through holes F42 , G43 and H44 correspond to the through holes C32 , the blind holes D33 and the explosion-proof holes 34 .

[0106] In this embodiment, the present invention provides a positive electrode insulating sheet for a lithium battery, comprising an assembly through hole E, a through hole F, a through hole G, and a through hole H, which are used to cooperate with the positive electrode cover plate to realize the functions of assembly, liquid injection, secondary liquid injection, and overvoltage detection.

[0107] Example 7:

[0108] An assembly method for the lithium battery provided by the present invention comprises the following steps:

[0109] S1: The negative electrode current collecting structure 6 is welded to the negative end of the battery cell 2, and the positive electrode current collecting structure 5 is welded to the positive end of the battery cell 2;

[0110] S2: The positive electrode insulating sheet 4 is installed on the second groove 522 of the positive electrode current collecting column 52;

[0111] S3: The positive electrode cover plate 3 is installed on the first groove 521 of the positive electrode current collecting column 52;

[0112] S4: The negative end of the battery cell 2 is placed inwardly into the housing 1, and the negative end of the housing 1 is mounted on the third groove 621 of the negative current collecting column 62;

[0113] S5: The edge of the positive electrode cover plate 3 is welded to the positive end of the shell 1.

[0114] Preferably, after step S5, the gaps between the positive electrode current collecting structure 5, the negative electrode current collecting structure 6 and the housing 1 connected by the assembly through-holes A and B are insulated and sealed by curing using an epoxy resin composition.

[0115] In this embodiment, the present invention provides a lithium battery assembly method. When welding the battery cell to the current collecting structure, the battery cell tab passes through the long arc hole and folds tightly against the upper surface of the current collecting disk. Spot welding can be performed directly on the upper surface of the current collecting disk. The operation is simple and the connection is precise. The positive electrode cover plate, the positive electrode insulating sheet and the positive electrode current collecting structure, and the negative electrode current collecting structure and the negative end of the shell are installed and connected through grooves. This omits the welding steps of the prior art assembly process, reduces the welding procedures between battery components, and is simple to assemble and easy for non-technical personnel to learn and use. After assembly is completed, the gap between the current collecting structure and the shell connected by the assembly through hole A and the assembly through hole B is insulated and cured using an epoxy resin composition to ensure the sealing and insulation properties of the entire battery.

[0116] In the description of the embodiments of the present invention, it needs to be understood that terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "bottom", "inside", "outside", "inside", and "outside" indicate directions or positional relationships.

[0117] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "assembled" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0118] In the description of the embodiments of the present invention, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0119] In describing the embodiments of the present invention, it should be understood that "" and "~" represent a range between two values, and the range includes the endpoints. For example, "AB" represents a range greater than or equal to A and less than or equal to B. "A~B" represents a range greater than or equal to A and less than or equal to B.

[0120] In describing the embodiments of the present invention, the term "and / or" is used herein to describe a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " is generally used herein to indicate that the associated objects are in an "or" relationship.

[0121] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery, characterized in that: include: a housing having a positive terminal and a negative terminal; A battery cell having a positive side and a negative side; positive electrode cover; Positive electrode insulation sheet; A positive electrode current collecting structure, comprising a positive electrode current collecting plate and a positive electrode current collecting column; A negative electrode current collecting structure, comprising a negative electrode current collecting plate and a negative electrode current collecting column; The housing is a hollow cylindrical tube, the positive end is open, the negative end is closed, and an assembly through hole A is provided in the center of the negative end surface; The positive electrode current collecting column is arranged at the center of the positive electrode current collecting disk and is integrally connected to the positive electrode current collecting disk; The negative electrode current collecting column is arranged at the center of the negative electrode current collecting disc and is integrally connected to the negative electrode current collecting disc; Wherein, the positive electrode cover plate is installed on the positive electrode current collecting structure and is used to seal the positive end of the shell; The positive electrode insulating sheet is installed on the positive electrode current collecting structure and is located between the positive electrode cover plate and the positive electrode current collecting structure; The positive electrode surface of the battery cell is welded to the positive electrode current collecting structure, and the negative electrode surface of the battery cell is welded to the negative electrode current collecting structure; Wherein, the negative electrode current collecting structure is connected to the negative end of the shell through the assembly through hole A; The positive electrode current collecting column includes a first groove and a second groove, and the negative electrode current collecting column includes a third groove; The first groove is used to assemble the positive electrode cover plate, the second groove is used to assemble the positive electrode insulating sheet, and the third groove is used to assemble the negative end of the shell; The distance between the first groove and the second groove is 2 mm.

2. A lithium battery according to claim 1, characterized in that: The positive electrode current collecting disc and the negative electrode current collecting disc both include long arc holes, which are used for the electrode tabs to pass through, and the distribution positions of the long arc holes correspond one to one with the electrode tabs.

3. A lithium battery according to claim 2, characterized in that: The width of the long arc hole is 1 mm and the length is 5 mm.

4. A lithium battery according to claim 1, characterized in that: The battery cell comprises: A positive electrode sheet including a positive conductive layer and a positive electrode ear; A negative electrode sheet including a negative electrode conductive layer and a negative electrode ear; a diaphragm having a diaphragm width direction, wherein the diaphragm width direction includes a positive direction and a negative direction; The positive electrode sheet, diaphragm and negative electrode sheet are wound in sequence to form a battery cell; The positive electrode conductive layer is arranged outside the positive electrode sheet, and the positive electrode tab is led out in the positive direction; the negative electrode conductive layer is arranged outside the negative electrode sheet, and the negative electrode tab is led out in the negative direction.

5. A lithium battery according to claim 1, characterized in that: The positive electrode cover plate comprises: A mounting through hole B having an insulating portion; A through hole C is used to inject electrolyte into the battery; a blind hole D, which can be destroyed when necessary to inject electrolyte into the battery for a second time; An explosion-proof hole with a weak area, wherein the explosion-proof hole is a blind hole; Wherein, the insulating portion is an insulating material coating, which is provided on the inner wall of the assembly through hole B and extends along the assembly through hole B to the upper and lower surfaces of the positive electrode cover plate; Wherein, the weak area is a cross-shaped milling groove; Wherein, the assembly through hole B is located at the center of the positive electrode cover; Wherein, the through hole C, the blind hole D and the explosion-proof hole are not connected to each other.

6. A lithium battery according to claim 5, characterized in that: The coating extends along the assembly through hole B to the upper and lower surfaces of the positive electrode cover plate by a distance of 3 mm.

7. The lithium battery according to claim 1, wherein: The positive electrode insulating sheet includes an assembly through hole E, a through hole F, a through hole G and a through hole H. The positions of the through hole F, the through hole G and the through hole H correspond one to one with the through hole C, the blind hole D and the explosion-proof hole.

8. An assembly method for assembling a lithium battery according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: The negative electrode current collecting structure is welded to the negative end of the battery cell, and the positive electrode current collecting structure is welded to the positive end of the battery cell; S2: The positive electrode insulating sheet is installed on the second groove of the positive electrode current collecting column; S3: The positive electrode cover is installed on the first groove of the positive electrode current collecting column; S4: The negative end of the cell is inserted into the outer shell, and the negative end of the outer shell is installed on the third groove of the negative current collecting column; S5: Weld the edge of the positive electrode cover to the positive end of the shell.

9. The method for assembling a lithium battery according to claim 8, wherein: After step S5, the gaps between the positive electrode current collecting structure, the negative electrode current collecting structure and the housing connected by the assembly through-holes A and B are sealed by insulating and curing using the epoxy resin composition.

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