Winding type laminated battery

Abstract

The utility model relates to the technical field of batteries, in particular to a winding type laminated battery. Comprising a shell, the shell is connected with an insulating side plate, the insulating side plate is connected with a battery cell, the battery cell comprises a first pole piece, a first diaphragm, a second pole piece and a second diaphragm, the first pole piece, the first diaphragm, the second pole piece and the second diaphragm are alternately stacked and wound, the first pole piece is connected with a positive pole lug, and the second pole piece is connected with a negative pole lug. The second pole piece is connected with a negative pole lug, the insulating side plate is connected with a limiting support plate, and the limiting support plate is propped against the battery cell; the battery cell is connected with a flame-retardant device; and the flame-retardant device is used for preventing the battery from burning. According to the technical scheme, the battery cell can be limited and stabilized in the shell, so that the battery cell is prevented from colliding with the shell, and the service life of the battery device is prolonged to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a wound laminated battery. Background Art

[0002] As a new energy source, lithium-ion batteries are widely used in various electronic devices and automobiles due to their advantages such as being green, environmentally friendly, recyclable, small in size and easy to carry, and have become one of the most widely used energy sources.

[0003] A search of a Chinese utility model patent (publication number CN217903187U) discloses a wound cell and battery comprising: a first pole piece, a first diaphragm, a second pole piece, and a second diaphragm, wherein the first pole piece, the first diaphragm, the second pole piece, and the second diaphragm are alternately stacked and wound. The first pole piece comprises a first pole piece body and a plurality of first pole tabs, with each turn of the first pole piece body provided with the first pole tab. In two adjacent turns of the first pole tab, the orthographic projection of the first pole tab on the inner turn of the first pole tab lies within the first pole tab. The second pole piece comprises a second pole piece body and a plurality of second pole tabs, with each turn of the second pole piece body provided with the second pole tab, and the plurality of second pole tabs are spaced apart from the plurality of first pole tabs. This can alleviate the problem of pole tab breakage during welding.

[0004] However, the inventors have discovered that this technical solution still has at least the following defects:

[0005] After the existing battery cell is installed in the shell, the contact area between the battery cell and the two walls of the shell is small because the two sides of the wound battery cell are arc parts, and the battery cell cannot be fixed in the shell. Therefore, the two sides of the battery cell are prone to collision or friction with the shell, damaging the battery cell and thus shortening the service life of the battery. Utility Model Content

[0006] The present utility model is intended to provide a method for solving the problems raised in the above background technology.

[0007] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0008] A wound laminated battery, characterized in that: it includes a shell, the shell is connected to an insulating side plate, the insulating side plate is connected to a battery cell, the battery cell includes a first electrode sheet, a first diaphragm, a second electrode sheet, and a second diaphragm, the first electrode sheet, the first diaphragm, the second electrode sheet, and the second diaphragm are alternately stacked and wound, the first electrode sheet is connected to a positive electrode tab, the second electrode sheet is connected to a negative electrode tab, the insulating side plate is connected to a limiting support plate, and the limiting support plate contacts the battery cell;

[0009] The battery core is connected to a flame retardant device, which prevents the battery from burning.

[0010] Preferably, the flame retardant device includes a flame retardant block, the center of the battery cell is connected to the flame retardant block, and a flame retardant is encapsulated inside the flame retardant block.

[0011] Preferably, the shell is connected to a top cover, the top cover is connected to a positive electrode column and a negative electrode column, the positive electrode tab is connected to a first current collecting sheet, the first current collecting sheet is connected to a first adapter sheet, the first adapter sheet is connected to the positive electrode column, the negative electrode tab is connected to a second current collecting sheet, the second current collecting sheet is connected to a second adapter sheet, and the second adapter sheet is connected to the negative electrode column.

[0012] Preferably, the top cover is connected to a pressure relief valve.

[0013] Preferably, the top cover is connected with a liquid injection hole.

[0014] Preferably, the shell is connected to a bottom supporting piece, and the bottom supporting piece contacts the battery core.

[0015] Compared with the existing technology, this technical solution has the following beneficial effects:

[0016] (1) By setting a limit support plate, the contact area between the battery cell and the shell is increased, thereby stabilizing the battery cell inside the shell, reducing damage caused by collision and friction, and thus extending the service life of the battery.

[0017] (2) This solution sets up a flame retardant block, which is made of polymer. When the battery temperature reaches a certain threshold, the outer shell will soften and melt at high temperature, releasing the internal flame retardant. The flame retardant can quickly disperse to all parts of the battery cell, preventing the battery from burning, thereby improving the safety of the battery.

[0018] (3) By providing current collectors and adapters, current can be conducted more efficiently, reducing current loss and resistance during transmission, and improving the discharge performance of the battery. The current collectors and adapters provide a more stable and reliable structure for the internal connection of the battery, reducing loose connections or poor contact caused by factors such as vibration and impact. They also ensure that the current is evenly distributed between the electrodes inside the battery, avoiding electrode polarization and performance degradation caused by local current concentration.

[0019] (4) By setting a pressure relief valve, when a large amount of gas is generated inside the battery due to abnormal conditions (such as overcharging, overheating, internal short circuit, etc.), causing the pressure to rise sharply, the pressure relief valve can be opened in time to release the pressure, greatly reducing the risk of battery explosion, and timely discharge of gas, reducing the possibility of flammable gas accumulation inside the battery and reducing the probability of fire.

[0020] (5) By setting up the injection hole, an appropriate amount of electrolyte can be accurately injected into the battery, which helps to achieve high energy density, long cycle life and good charge and discharge performance of the battery. During the injection process, the gas inside the battery can be discharged through the injection hole to avoid gas accumulation affecting the infiltration of the electrolyte and battery performance.

[0021] (6) By setting up a bottom support sheet, a stable support is provided for the components inside the battery, preventing the internal structure of the battery from displacement or deformation when in use, transportation or subjected to external force. It can evenly withstand the external pressure, avoid the concentrated pressure from causing damage to the sensitive components inside the battery, and play the role of isolating the positive and negative poles of the battery to prevent the occurrence of short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A front view of a wound laminated battery provided by the present invention;

[0023] Figure 2 A cross-sectional view of a wound laminated battery provided by the present invention;

[0024] Figure 3 A top cross-sectional view of a wound laminated battery provided by the present invention;

[0025] Figure numerals: shell 1, top cover 2, injection hole 3, negative electrode column 4, pressure relief valve 5, positive electrode column 6, insulating side plate 7, limit support plate 8, battery cell 9, negative electrode tab 10, first current collecting sheet 11, first adapter sheet 12, positive electrode tab 13, second current collecting sheet 14, second adapter sheet 15, bottom support sheet 16, first diaphragm 17, first electrode sheet 18, second diaphragm 19, second electrode sheet 20, flame retardant block 21. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0027] like Figure 1-3A wound laminated battery is shown, comprising a shell 1, an insulating side plate 7 connected to the inside of the shell 1, and a battery cell 9 connected to the insulating side plate 7. The insulating side plate 7 is wrapped around the outside of the battery cell 9 and fits with the battery cell 9. The battery cell 9 comprises a first electrode 18, a first diaphragm 17, a second electrode 20, and a second diaphragm 19. From the inside to the outside, the second electrode 20, the second diaphragm 19, the first electrode 18, and the first diaphragm 17 are wound in a circular shape. Each circle of the first electrode 18 is welded to a plurality of positive electrode tabs 13, and each circle of the second electrode 20 is welded to a plurality of negative electrode tabs 10. The plurality of positive electrode tabs 13 and the plurality of negative electrode tabs 10 are arranged at intervals. The left and right side walls inside the insulating side plate 7 are respectively connected to a limiting support plate 8. The two limiting support plates 8 respectively contact the left and right sides of the battery cell 9 to stabilize the battery cell 9 inside the shell 1; the battery cell 9 is connected to a flame retardant device, which prevents the battery from burning. The flame retardant device includes a flame retardant block 21, which is connected to the center of the battery cell 9. A flame retardant is encapsulated inside the flame retardant block 21. The flame retardant block 21 is made of polymer. When the battery temperature is too high during use, or a short circuit occurs due to rupture, puncture, etc., causing the internal temperature of the battery to rise, the polymer shell 1 will soften and melt, releasing the internal flame retardant. The flame retardant can be quickly dispersed throughout the battery cell 9, preventing the battery from burning, thereby improving the safety of the lithium-ion battery.

[0028] like Figure 2 As shown, the top of the housing 1 is welded to a top cover 2, with the positive electrode column 6 and the negative electrode column 4 connected to the two ends of the top cover 2, respectively. The top of the positive electrode tab 13 is welded to a first current collector 11, and one end of the first current collector 11 is connected to a first adapter 12. The first adapter 12 is welded to the bottom of the positive electrode column 6 to ensure efficient current transmission between the adapter 12 and the positive electrode column 6, reducing resistance and energy loss. The top of the negative electrode tab 10 is welded to a second current collector 14, and one end of the second current collector 14 is connected to a second adapter 15. The second adapter 15 is welded to the bottom of the negative electrode column 4, ensuring efficient current transmission. A pressure relief valve 5 is connected to the center of the top cover 2. The pressure relief valve 5 is the weakest point of the housing 1. When a large amount of gas is generated inside the battery due to abnormal conditions (such as overcharging, overheating, internal short circuit, etc.), causing a sharp rise in pressure, the pressure relief valve 5 can open in time to release the pressure, greatly reducing the risk of battery explosion. The top cover 2 is connected to a liquid injection hole 3. When liquid injection is needed, the appropriate amount of electrolyte can be injected by opening the liquid injection hole 3. The bottom of the shell 1 is connected to a bottom support sheet 16, which contacts the battery core 9 and provides stable support for the components inside the battery.

[0029] The specific assembly process is as follows:

[0030] First, the second electrode piece 20, the second diaphragm 19, the first electrode piece 18 and the first diaphragm 17 are wound in a circular shape from the inside to the outside to form a battery cell 9. During the winding process, the battery cell 9 wraps the flame retardant block 21 in the center, and welds a plurality of positive electrode tabs 13 on each circle of the first electrode piece 18, and welds a plurality of negative electrode tabs 10 on each circle of the second electrode piece 20. The plurality of positive electrode tabs 13 and the plurality of negative electrode tabs 10 are arranged at intervals, and then the plurality of positive electrode tabs 13 are welded to the first current collecting sheet 11, and the plurality of negative electrode tabs 10 are welded to the second current collecting sheet 14. Then, the first current collecting sheet 11 is welded to the plurality of positive electrode tabs 13. The first adapter plate 12 is welded to the bottom of the positive electrode column 6, and then the second adapter plate 15 connected to the second current collector 14 is welded to the bottom of the negative electrode column 4. Then the limit support plate 8 is connected to the insulating side plate 7, and then the insulating side plate 7 is wrapped around the outside of the battery cell 9. After the wrapping is completed, it is hot-melted and fixed to the top cover 2. The pressure relief valve 5 and the injection hole 3 are connected to the top cover 2. Finally, the bottom support plate 16 is placed in the shell 1, and the wrapped battery cell 9 assembly is placed in the shell 1 to complete the shell insertion. Finally, the contact part of the shell 1 and the top is laser welded to complete the assembly of the entire battery.

[0031] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A wound laminated battery, characterized in that: The invention comprises a shell (1), wherein the shell (1) is connected to an insulating side plate (7), the insulating side plate (7) is connected to a battery cell (9), the battery cell (9) comprises a first pole piece (18), a first diaphragm (17), a second pole piece (20) and a second diaphragm (19), the first pole piece (18), the first diaphragm (17), the second pole piece (20) and the second diaphragm (19) are alternately stacked and wound, the first pole piece (18) is connected to a positive pole tab (13), the second pole piece (20) is connected to a negative pole tab (10), the insulating side plate (7) is connected to a limiting support plate (8), and the limiting support plate (8) is in contact with the battery cell (9); The battery core (9) is connected to a flame retardant device, which prevents the battery from burning.

2. The wound laminated battery according to claim 1, wherein: The flame retardant device comprises a flame retardant block (21), the center of the battery core (9) is connected to the flame retardant block (21), and a flame retardant is encapsulated inside the flame retardant block (21).

3. The wound laminated battery according to claim 1, wherein: The housing (1) is connected to a top cover (2), the top cover (2) is connected to a positive electrode column (6) and a negative electrode column (4), the positive electrode tab (13) is connected to a first current collecting sheet (11), the first current collecting sheet (11) is connected to a first adapter sheet (12), the first adapter sheet (12) is connected to the positive electrode column (6), the negative electrode tab (10) is connected to a second current collecting sheet (14), the second current collecting sheet (14) is connected to a second adapter sheet (15), and the second adapter sheet (15) is connected to the negative electrode column (4).

4. The wound laminated battery according to claim 3, wherein: The top cover (2) is connected to a pressure relief valve (5).

5. The wound laminated battery according to claim 3, wherein: The top cover (2) is connected to a liquid injection hole (3).

6. The wound laminated battery according to claim 1, wherein: The housing (1) is connected to a bottom support sheet (16), and the bottom support sheet (16) contacts the battery core (9).

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