Button soft pack lithium battery and assembly method thereof

Abstract

The present invention provides a button soft-pack lithium battery and an assembly method thereof, comprising a soft-pack battery cell and a shell, wherein the soft-pack battery cell comprises a battery cell body, a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet and the negative electrode sheet are used to draw current from the battery cell body; the shell comprises an insulating shell, a positive electrode shell and a negative electrode shell, wherein the positive electrode shell and the negative electrode shell are both conductive; the positive electrode shell and the negative electrode shell are respectively installed at the upper and lower ends of the insulating shell to encapsulate the soft-pack battery cell in the shell; the positive electrode sheet is conductively connected to the positive electrode shell, and the negative electrode sheet is conductively connected to the negative electrode shell; the positive electrode sheet is first welded to the positive electrode shell, the negative electrode sheet is welded to the negative electrode shell, the positive electrode shell and the negative electrode shell are moved, and then the shell is assembled, and finally an insulating sleeve is installed. The button soft-pack lithium battery and the assembly method thereof provided by the present invention encapsulate the soft-pack battery cell in the shell, so that the outline size of the shell becomes the outline size of the button soft-pack lithium battery, thereby reducing the dimensional tolerance of the button soft-pack lithium battery and facilitating installation and use by users.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and more specifically, relates to a button soft-pack lithium battery and an assembling method thereof. Background Art

[0002] A button battery is a battery that looks like a small button. Generally, it has a larger diameter and a thinner thickness. It is widely used in products such as computer motherboards, electronic watches, electronic dictionaries, electronic scales, remote controls, and electric toys.

[0003] Currently, the button soft-pack lithium batteries on the market only have soft-pack cells. Due to the structure and material characteristics of the soft-pack cells themselves, the existing button soft-pack lithium batteries are easily deformed and it is difficult to unify the external dimensions, which makes the external dimension tolerance of the button soft-pack lithium batteries large, causing inconvenience to users when using button soft-pack lithium batteries. Summary of the invention

[0004] The object of the present invention is to provide a button soft-pack lithium battery and an assembly method thereof, so as to solve the technical problem of large external dimension tolerance between button soft-pack lithium batteries existing in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a button soft-pack lithium battery, comprising a soft-pack battery cell and a shell, wherein the soft-pack battery cell comprises a battery cell body, a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet and the negative electrode sheet are used to draw current from the battery cell body;

[0006] The shell comprises an insulating shell, a positive electrode shell and a negative electrode shell, and both the positive electrode shell and the negative electrode shell are conductive;

[0007] The positive electrode shell and the negative electrode shell are respectively installed at the upper and lower ends of the insulating shell to encapsulate the soft-pack battery cell in the shell;

[0008] The positive electrode sheet is conductively connected to the positive electrode shell, and the negative electrode sheet is conductively connected to the negative electrode shell.

[0009] Furthermore, the insulating shell is provided with a receiving groove, the battery cell body is provided with a folded edge, and the folded edge extends into the receiving groove.

[0010] Furthermore, the accommodating groove extends along the circumference of the insulating shell.

[0011] Furthermore, it also includes an insulating sleeve sleeved on the insulating shell.

[0012] Furthermore, the orthographic projections of the positive electrode shell and the negative electrode shell in the up-down direction are both located within the orthographic projection of the insulating shell in the up-down direction.

[0013] Furthermore, the insulating shell comprises an outer shell and an inner shell provided at the upper and lower ends of the outer shell;

[0014] The positive electrode shell and the negative electrode shell are respectively arranged outside the inner shell;

[0015] The upper end of the outer wall of the insulating case is aligned with the lower end of the outer wall of the positive electrode case, and the lower end of the outer wall of the insulating case is aligned with the upper end of the outer wall of the negative electrode case.

[0016] Furthermore, the inner shell is provided with a card slot and / or a card protrusion, the positive electrode shell is correspondingly provided with a card protrusion and / or a card slot, and the negative electrode shell is correspondingly provided with a card protrusion and / or a card slot;

[0017] The latching protrusion can extend into the latching groove to respectively latch the positive electrode shell and the negative electrode shell onto the insulating shell.

[0018] Further, the insulating shell includes a first arc-shaped shell and a second arc-shaped shell spliced ​​along the circumference of the insulating shell;

[0019] The end of the first arc-shaped shell extending along the circumferential direction of the insulating shell is provided with a first limiting protrusion, and the inner side or outer side of the first limiting protrusion is provided with a first limiting groove; the end of the second arc-shaped shell extending along the circumferential direction of the insulating shell is provided with a second limiting protrusion corresponding to the first limiting groove, and the inner side or outer side of the second limiting protrusion is provided with a second limiting groove corresponding to the first limiting protrusion;

[0020] The first limiting protrusion can extend into the second limiting groove, and the second limiting protrusion can extend into the first limiting groove.

[0021] Furthermore, it also includes insulating layers respectively arranged between the battery cell body and the positive electrode shell and between the battery cell body and the negative electrode shell.

[0022] The present invention also provides a button soft-pack lithium battery assembly method, comprising the following steps:

[0023] Welding the positive electrode sheet of the soft-pack battery cell into the positive electrode shell; welding the negative electrode sheet of the soft-pack battery cell into the negative electrode shell; fixing the insulating layer to the upper and lower ends of the battery body of the soft-pack battery cell respectively;

[0024] Move the positive electrode shell from the side of the battery cell body to the top of the battery cell body, and move the negative electrode shell from the side of the battery cell body to the bottom of the battery cell body;

[0025] Splicing the first arc-shaped shell and the second arc-shaped shell on the outer side of the battery cell body to form an insulating shell;

[0026] Pushing the positive electrode shell downward to clamp the positive electrode shell to the upper end of the insulating shell, and pushing the negative electrode shell upward to clamp the negative electrode shell to the lower end of the insulating shell;

[0027] The insulating sleeve is sleeved outside the insulating shell.

[0028] The button soft-pack lithium battery and the assembly method thereof provided by the present invention have the following beneficial effects: compared with the prior art, the positive electrode shell and the negative electrode shell of the button soft-pack lithium battery of the present invention are respectively installed at the upper and lower ends of the insulating shell to form the shell, so that the outline size of the shell is easy to control, so that the outline size of the shell produced in batches is the same, and the dimensional tolerance between the shells is reduced. Therefore, after the soft-pack battery cell is encapsulated in the shell, the outline size of the shell is the outline size of the button soft-pack lithium battery, thereby reducing the dimensional tolerance of the button soft-pack lithium battery, facilitating user installation and use, and also facilitating user replacement and maintenance; the soft-pack battery cell is located in the shell and can be protected by the shell, avoiding deformation of the soft-pack battery cell when the button soft-pack lithium battery falls, is impacted by external forces, etc., causing damage to the button soft-pack lithium battery, thereby reducing the failure rate of the button soft-pack lithium battery; the positive electrode shell and the negative electrode shell are installed at the upper and lower ends of the insulating shell, so the positive electrode shell and the negative electrode shell can be insulated and installed through the insulating shell, avoiding short circuit of the button soft-pack lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 A schematic diagram of the structure of a button soft-pack lithium battery provided in an embodiment of the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the explosion structure of a medium-sized button soft-pack lithium battery;

[0032] Figure 3 for Figure 2 Schematic diagram of the structure of a medium soft pack battery cell;

[0033] Figure 4 for Figure 2 A schematic diagram of the structure of the middle insulating shell;

[0034] Figure 5 for Figure 2 Schematic diagram of the structure of the first arc shell;

[0035] Figure 6 for Figure 2Schematic diagram of the structure of the second curved shell;

[0036] Figure 7 for Figure 1 Figure 1. The falling state of a medium-sized button-type soft-pack lithium battery.

[0037] Among them, the reference numerals in the figure are:

[0038] 1. Soft-pack battery cell; 11. Battery cell body; 111. Folded edge; 12. Positive electrode sheet; 13. Negative electrode sheet; 2. Shell; 21. Insulating shell; 211. Outer shell; 2111. Accommodating groove; 212. Inner shell; 2121. Card slot; 213. First arc-shaped shell; 2131. First limiting protrusion; 2132. First limiting groove; 214. Second arc-shaped shell; 2141. Second limiting protrusion; 2142. Second limiting groove; 215. Avoiding groove; 22. Positive electrode shell; 221. Identification mark; 23. Negative electrode shell; 24. Card convex; 3. Insulating sleeve. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0041] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] See also Figures 1 to 4The button soft-pack lithium battery provided by the present invention is now described. The button soft-pack lithium battery comprises a soft-pack battery cell 1 and a shell 2. The soft-pack battery cell 1 comprises a battery cell body 11, a positive electrode sheet 12 and a negative electrode sheet 13. The positive electrode sheet 12 and the negative electrode sheet 13 are used to draw current from the battery cell body 11.

[0044] The housing 2 includes an insulating housing 21, a positive electrode housing 22 and a negative electrode housing 23, and both the positive electrode housing 22 and the negative electrode housing 23 are conductive;

[0045] The positive electrode shell 22 and the negative electrode shell 23 are respectively installed at the upper and lower ends of the insulating shell 21 to encapsulate the soft-pack battery cell 1 in the shell 2;

[0046] The positive electrode sheet 12 is conductively connected to the positive electrode case 22 , and the negative electrode sheet 13 is conductively connected to the negative electrode case 23 .

[0047] Compared with the prior art, the button soft-pack lithium battery provided by the present invention has a positive electrode shell 22 and a negative electrode shell 23 respectively installed at the upper and lower ends of the insulating shell 21 to form the shell 2, so that the outline size of the shell 2 is easy to control, so that the outline size of the shell 2 produced in batches is the same, and the dimensional tolerance between the shells 2 is reduced. Therefore, after the soft-pack battery cell 1 is encapsulated in the shell 2, the outline size of the shell 2 is the outline size of the button soft-pack lithium battery, thereby reducing the dimensional tolerance of the button soft-pack lithium battery, facilitating user installation and use, and also facilitating user replacement and maintenance; the soft-pack battery cell 1 is located in the shell 2 and can be protected by the shell 2, so that the button soft-pack lithium battery is prevented from being deformed when it falls, is impacted by external forces, etc., causing the button soft-pack lithium battery to be damaged, thereby reducing the failure rate of the button soft-pack lithium battery; the positive electrode shell 22 and the negative electrode shell 23 are installed at the upper and lower ends of the insulating shell 21, so the positive electrode shell 22 and the negative electrode shell 23 can be insulated and installed through the insulating shell 21, so as to avoid short circuit of the button soft-pack lithium battery.

[0048] Specifically, the insulating shell 21 is a plastic part.

[0049] Specifically, the positive electrode case 22 and the negative electrode case 23 are both hollow truncated cones.

[0050] For further information, see Figures 2 to 4As a specific embodiment of the button soft-pack lithium battery provided by the present invention, a receiving groove 2111 is provided on the insulating shell 21, and a folded edge 111 is provided on the battery body 11, and the folded edge 111 extends into the receiving groove 2111, so that the battery body 11 is as close to the insulating shell 21 as possible, reducing the size of the insulating shell 21, avoiding the folded edge 111 from occupying too much space in the insulating shell 21, resulting in the insulating shell 21 being too large in size, and by changing the size of the folded edge 111 extending into the receiving groove 2111, the insulating shell 21 can accommodate soft-pack batteries 1 of various sizes, thereby improving the compatibility of the shell 2; the groove wall of the receiving groove 2111 can limit the folded edge 111, avoiding the soft-pack battery 1 from moving freely in the shell 2, causing the soft-pack battery 1 to collide with the shell 2 and affect the service life of the button soft-pack lithium battery.

[0051] Specifically, the accommodating groove 2111 is a through groove connecting the inside and the outside of the insulating shell 21 .

[0052] For further information, see Figure 2 and Figure 4 As a specific embodiment of the button soft-pack lithium battery provided by the present invention, the accommodating groove 2111 extends along the circumference of the insulating shell 21, so that the upper part of the battery body 11 is aligned with the positive electrode shell 22, and the lower part of the battery body 11 is aligned with the negative electrode shell 23, thereby improving the rationality of the installation position of the soft-pack battery 1 in the shell 2, avoiding unreasonable installation of the soft-pack battery 1 in the shell 2, and reducing the compatibility of the shell 2 for installing soft-pack battery cells 1 of different sizes.

[0053] For further information, see Figure 1 , Figure 2 and Figure 4 As a specific embodiment of the button soft-pack lithium battery provided by the present invention, it also includes an insulating sleeve 3 sleeved on the insulating shell 21, which can separate the outside from the shell 2, and wrap the folded edge 111 in the insulating sleeve 3. At the same time, it can reduce the entry of foreign objects from the receiving groove 2111 into the shell 2, so as to improve the integrity of the button soft-pack lithium battery, reduce the short circuit risk of the button soft-pack lithium battery, and extend the service life of the button soft-pack lithium battery.

[0054] Specifically, the upper and lower ends of the insulating sleeve 3 are respectively fitted with the housing 2 to improve the sealing of the button soft-pack lithium battery and extend the service life of the button soft-pack lithium battery.

[0055] For further information, see Figure 1 , Figure 4 and Figure 7As a specific embodiment of the button-pack lithium battery provided by the present invention, the orthographic projections of the positive electrode shell 22 and the negative electrode shell 23 along the up-down direction are both located within the orthographic projections of the insulating shell 21 along the up-down direction. When the button-pack lithium battery falls on the ground or on a table, the positive electrode shell 22 and the negative electrode shell 23 cannot contact the ground or the table at the same time through the support of the insulating shell 21, thereby avoiding a short circuit of the button-pack lithium battery.

[0056] For further information, see Figure 1 , Figure 2 and Figure 4 As a specific embodiment of the button soft-pack lithium battery provided by the present invention, the insulating shell 21 includes an outer shell 211 and an inner shell 212 provided at the upper and lower ends of the outer shell 211;

[0057] The positive electrode shell 22 and the negative electrode shell 23 are respectively arranged outside the inner shell 212, so as to encapsulate the insulating shell 21, the positive electrode shell 22 and the negative electrode shell 23 into a shell 2;

[0058] The upper end of the outer wall of the insulating shell 21 is aligned with the lower end of the outer wall of the positive electrode shell 22, and the lower end of the outer wall of the insulating shell 21 is aligned with the upper end of the outer wall of the negative electrode shell 23, so as to improve the integrity of the shell 2, avoid the positive electrode shell 22 and the negative electrode shell 23 protruding from the outer shell 211 and affecting the installation and use of the button soft-pack lithium battery, and facilitate the control of the cross-sectional dimensions of the insulating shell 21, the positive electrode shell 22 and the negative electrode shell 23, so that the positive electrode shell 22 and the negative electrode shell 23 cannot contact the ground or the desktop at the same time.

[0059] Specifically, the upper part of the shell 2 is a frustum with a diameter that gradually decreases from bottom to top, and the lower part of the shell 2 is a frustum with a diameter that gradually decreases from top to bottom, and the outer contour of the shell 2 is symmetrical up and down, so that the button soft-pack lithium battery is similar in shape to the button batteries on the market, which is convenient for users to use and can also prevent the button soft-pack lithium battery from short-circuiting after it falls.

[0060] For further information, see Figure 2 and Figure 4 As a specific embodiment of the button soft-pack lithium battery provided by the present invention, a card slot 2121 is provided on the inner shell 212, a card protrusion 24 is provided on the positive electrode shell 22, and a card protrusion 24 is provided on the negative electrode shell 23; or

[0061] The inner shell 212 is provided with a latching protrusion, the positive electrode shell 22 is provided with a latching groove, and the negative electrode shell 23 is provided with a latching groove; or

[0062] The inner shell 212 is provided with a slot 2121 and a protrusion, the positive electrode shell 22 is provided with a protrusion 24 and a slot, and the negative electrode shell 23 is provided with a protrusion 24 and a slot;

[0063] The latching protrusion 24 can extend into the latching groove 2121 to respectively latch the positive electrode shell 22 and the negative electrode shell 23 onto the insulating shell 21 , which has a simple structure, convenient installation and high assembly efficiency.

[0064] For further information, see Figure 2 , Figure 5 and Figure 6 As a specific embodiment of the button soft-pack lithium battery provided by the present invention, the insulating shell 21 includes a first arc-shaped shell 213 and a second arc-shaped shell 214 spliced ​​along the circumference of the insulating shell 21, so that the soft-pack battery cell 1 is placed in the insulating shell 21 to improve assembly efficiency;

[0065] The end of the first arc-shaped shell 213 extending along the circumferential direction of the insulating shell 21 is provided with a first limiting protrusion 2131, and the inner side or outer side of the first limiting protrusion 2131 is provided with a first limiting groove 2132; the end of the second arc-shaped shell 214 extending along the circumferential direction of the insulating shell 21 is provided with a second limiting protrusion 2141 corresponding to the first limiting groove 2132, and the inner side or outer side of the second limiting protrusion 2141 is provided with a second limiting groove 2142 corresponding to the first limiting protrusion 2131;

[0066] The first limiting protrusion 2131 can extend into the second limiting groove 2142, and the second limiting protrusion 2141 can extend into the first limiting groove 2132. The first limiting groove 2132 limits the second limiting protrusion 2141, and the second limiting groove 2142 limits the first limiting protrusion 2131, so as to ensure the stability of the first arcuate shell 213 and the second arcuate shell 214 after splicing, and avoid the first arcuate shell 213 and the second arcuate shell 214 from relative movement and dislocation along the up-down direction, the inside-outside direction and the circumferential direction of the insulating shell 21; the first arcuate shell 213 and the second arcuate shell 214 are connected together after splicing through the positive electrode shell 22 and the negative electrode shell 23, so the structure is simple and the assembly is convenient.

[0067] Specifically, the first arc-shaped shell 213 and the second arc-shaped shell 214 can also be connected through the insulating sleeve 3 .

[0068] Furthermore, as a specific embodiment of the button soft-pack lithium battery provided by the present invention, it also includes an insulating layer (not shown in the figure) respectively arranged between the battery cell body 11 and the positive electrode shell 22 and between the battery cell body 11 and the negative electrode shell 23, so that the battery cell body 11, the positive electrode shell 22 and the negative electrode shell 23 are insulated to avoid short circuit of the button soft-pack lithium battery, thereby improving the safety of using the button soft-pack lithium battery.

[0069] Specifically, the positive electrode sheet 12 is bent on the outer wall of the insulating layer, and the negative electrode sheet 13 is bent on the outer wall of the insulating layer to insulate the outer wall of the battery body 11, the positive electrode sheet 12 and the negative electrode sheet 13 to prevent the button soft-pack lithium battery from short-circuiting.

[0070] Specifically, the insulating layer is insulating tape.

[0071] For further information, see Figure 2 and Figure 4 As a specific embodiment of the button soft-pack lithium battery provided by the present invention, an air avoidance groove 215 for avoiding the positive electrode sheet 12 and the negative electrode sheet 13 is also provided on the insulating shell 21, so as to reduce the distance between the battery body 11 and the insulating shell 21, so that the soft-pack battery cell 1 can be installed more compactly in the shell 2, and avoid the gap between the battery body 11 and the shell 2 being too large to affect the stability of the soft-pack battery cell 1 installed in the shell 2; at the same time, the insulating shell 21 can be compatible with more soft-pack battery cells 1 of different sizes, thereby improving the compatibility of the shell 2.

[0072] For further information, see Figure 1 As a specific embodiment of the button soft-pack lithium battery provided by the present invention, an identification mark 221 is provided on the positive electrode shell 22 or the negative electrode shell 23. Preferably, the identification mark 221 is provided on the positive electrode shell 22 to record the production specifications of the button soft-pack lithium battery.

[0073] Specifically, the identification mark 221 is a two-dimensional code.

[0074] The present invention also provides a button soft-pack lithium battery assembly method, comprising the following steps:

[0075] S1: Weld the positive electrode sheet 12 of the soft-pack battery cell 1 into the positive electrode shell 22; weld the negative electrode sheet 13 of the soft-pack battery cell 1 into the negative electrode shell 23; and fix the insulating layer to the upper and lower ends of the battery body 11 of the soft-pack battery cell 1 respectively;

[0076] S2: Move the positive electrode case 22 from the side of the battery cell body 11 to the top of the battery cell body 11, and move the negative electrode case 23 from the side of the battery cell body 11 to the bottom of the battery cell body 11;

[0077] S3: splicing the first arc-shaped shell 213 and the second arc-shaped shell 214 to the outer side of the battery cell body 11 to form an insulating shell 21;

[0078] S4: Push the positive electrode shell 22 downward to clamp the positive electrode shell 22 to the upper end of the insulating shell 21, and push the negative electrode shell 23 upward to clamp the negative electrode shell 23 to the lower end of the insulating shell 21;

[0079] S5: Sleeve the insulating sleeve 3 onto the outside of the insulating shell 21 .

[0080] The assembling method of the button soft-pack lithium battery provided by the present invention comprises welding the positive electrode sheet 12 of the soft-pack battery cell 1 into the positive electrode shell 22, welding the negative electrode sheet 13 of the soft-pack battery cell 1 into the negative electrode shell 23, and then moving the positive electrode shell 22 from the side of the battery body 11 of the soft-pack battery cell 1 to the top of the battery body 11, and moving the negative electrode shell 23 from the side of the battery body 11 to the bottom of the battery body 11, the positive electrode sheet 12 will bend with the movement of the positive electrode shell 22, and the negative electrode sheet 13 will bend with the movement of the negative electrode shell 23; since the positive electrode shell 22 has been moved to the top of the battery body 11, and the negative electrode shell 23 has been moved to the bottom of the battery body 11 Therefore, by splicing the first arc shell 213 and the second arc shell 214 on the outside of the battery body 11 to form the insulating shell 21, the positive electrode shell 22 and the negative electrode shell 23 are prevented from interfering with the first arc shell 213 and the second arc shell 214, thereby improving the assembly efficiency and reducing the assembly difficulty; by assembling the insulating shell 21, the positive electrode shell 22 and the negative electrode shell 23 together to form the shell 2, and encapsulating the soft-pack battery cell 1 in the shell 2, the dimensional tolerance of the button soft-pack lithium battery is reduced, which is convenient for users to install and use; an insulating sleeve 3 is arranged outside the insulating shell 21, which reduces the entry of foreign objects into the shell 2 and improves the integrity of the button soft-pack lithium battery.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A button soft-pack lithium battery, comprising a soft-pack battery cell, wherein the soft-pack battery cell comprises a battery cell body, a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet and the negative electrode sheet are used to draw current from the battery cell body, characterized in that: Also includes a housing; The shell comprises an insulating shell, a positive electrode shell and a negative electrode shell, and both the positive electrode shell and the negative electrode shell are conductive; The positive electrode shell and the negative electrode shell are respectively installed at the upper and lower ends of the insulating shell to encapsulate the soft-pack battery cell in the shell; The positive electrode sheet is conductively connected to the positive electrode shell, and the negative electrode sheet is conductively connected to the negative electrode shell; The insulating shell comprises an outer shell and an inner shell provided at the upper and lower ends of the outer shell; The positive electrode shell and the negative electrode shell are respectively arranged outside the inner shell, so as to encapsulate the insulating shell, the positive electrode shell and the negative electrode shell into the shell; The inner shell is provided with a space-avoiding groove for avoiding the positive electrode sheet and the negative electrode sheet; The insulating shell is provided with a receiving groove, the battery body is provided with a folded edge, and the folded edge extends into the receiving groove; The upper end of the outer wall of the insulating shell is aligned with the lower end of the outer wall of the positive electrode shell, and the lower end of the outer wall of the insulating shell is aligned with the upper end of the outer wall of the negative electrode shell; The insulating shell comprises a first arc-shaped shell and a second arc-shaped shell spliced ​​along the circumference of the insulating shell; The end of the first arc-shaped shell extending along the circumferential direction of the insulating shell is provided with a first limiting protrusion, and the inner side or outer side of the first limiting protrusion is provided with a first limiting groove; the end of the second arc-shaped shell extending along the circumferential direction of the insulating shell is provided with a second limiting protrusion corresponding to the first limiting groove, and the inner side or outer side of the second limiting protrusion is provided with a second limiting groove corresponding to the first limiting protrusion; The first limiting protrusion can extend into the second limiting groove, and the second limiting protrusion can extend into the first limiting groove.

2. The button soft-pack lithium battery according to claim 1, characterized in that: The accommodating groove extends along the circumferential direction of the insulating shell.

3. The button soft-pack lithium battery according to claim 1, characterized in that: It also includes an insulating sleeve which is sleeved on the insulating shell.

4. The button soft-pack lithium battery according to claim 1, characterized in that: The orthographic projections of the positive electrode case and the negative electrode case in the up-down direction are both located within the orthographic projection of the insulating case in the up-down direction.

5. The button soft-pack lithium battery according to claim 1, characterized in that: The inner shell is provided with a card slot and / or a card convex, the positive electrode shell is correspondingly provided with a card convex and / or a card slot, and the negative electrode shell is correspondingly provided with a card convex and / or a card slot; The latching protrusion can extend into the latching groove to respectively latch the positive electrode shell and the negative electrode shell onto the insulating shell.

6. The button soft-pack lithium battery according to claim 1, characterized in that: It also includes insulating layers respectively arranged between the battery cell body and the positive electrode shell and between the battery cell body and the negative electrode shell.

7. A method for assembling a button soft-pack lithium battery according to any one of claims 1 to 6, characterized in that: The steps include: Welding the positive electrode sheet of the soft-pack battery cell into the positive electrode shell; welding the negative electrode sheet of the soft-pack battery cell into the negative electrode shell; fixing the insulating layer to the upper and lower ends of the battery body of the soft-pack battery cell respectively; Move the positive electrode shell from the side of the battery cell body to the top of the battery cell body, and move the negative electrode shell from the side of the battery cell body to the bottom of the battery cell body; Splicing the first arc-shaped shell and the second arc-shaped shell on the outer side of the battery cell body to form an insulating shell; Pushing the positive electrode shell downward to clamp the positive electrode shell to the upper end of the insulating shell, and pushing the negative electrode shell upward to clamp the negative electrode shell to the lower end of the insulating shell; The insulating sleeve is sleeved outside the insulating shell.

Images