A soft package lithium ion battery, a manufacturing method thereof and a soft package lithium ion battery

Abstract

The application relates to the technical field of batteries, in particular to a manufacturing method of a soft package lithium ion battery and the soft package lithium ion battery. The manufacturing method of the soft package lithium ion battery comprises the following steps: taking a roll-shaped hard tab, unfolding the roll-shaped hard tab and cutting the same to obtain a plurality of hard tab monomers, the hard tab monomer comprising a first hard tab and a second hard tab which are independently arranged; clamping the first hard tab and the second hard tab respectively and inserting the same into a tab sleeve, so that the first hard tab and the second hard tab are arranged in parallel with each other in the tab sleeve, and a tab structure is obtained; welding the first hard tab with a first tab arranged on one side of a cell monomer, welding the second hard tab with a second tab arranged on one side of the cell monomer, and obtaining a cell module; and sequentially performing packaging, liquid injection and double sealing on the cell module to obtain the soft package lithium ion battery. The above steps can improve the qualified rate of the soft package lithium ion battery.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a method for manufacturing a soft-pack lithium-ion battery and the soft-pack lithium-ion battery itself. Background Technology

[0002] Soft-pack lithium-ion batteries use a flexible aluminum-plastic film as the outer packaging, which is lighter, thinner, and more flexible than traditional hard-shell batteries. They are widely used in electric vehicles, portable electronic devices, and other fields where size and weight are critical.

[0003] On a semi-automatic multi-tab battery cell production line, when the first and second electrodes of the battery cell are connected to the hard tabs, the positive and negative hard tabs need to be clamped and fixed twice before being welded to the first and second electrodes of the battery cell respectively. After the positive and negative hard tabs are connected, the tab spacing is inconsistent and the tabs are skewed, which leads to a significant decrease in the pass rate of the produced soft-pack lithium-ion batteries. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a manufacturing method of a soft-pack lithium-ion battery and a soft-pack lithium-ion battery, so as to solve the problem of low yield of soft-pack lithium-ion batteries manufactured in the prior art.

[0005] This invention discloses a method for manufacturing a soft-pack lithium-ion battery, comprising the following steps: taking a rolled hard electrode tab, unfolding the rolled hard electrode tab and cutting it into several hard electrode tab cells, each hard electrode tab cell including an independently disposed first hard electrode tab and a second hard electrode tab; clamping the first hard electrode tab and the second hard electrode tab respectively and inserting them into an electrode tab sleeve so that the first hard electrode tab and the second hard electrode tab are arranged parallel to each other in the electrode tab sleeve, thereby obtaining an electrode tab structure; welding the first hard electrode tab to a first electrode tab disposed on one side of the cell cell, and welding the second hard electrode tab to a second electrode tab disposed on one side of the cell cell, thereby obtaining a cell module; and sequentially encapsulating, injecting electrolyte, and resealing the cell module to obtain a soft-pack lithium-ion battery.

[0006] Optionally, along the length of the tab sleeve, multiple sets of tab mounting holes are formed on the tab sleeve. Each set of tab mounting holes corresponds to one side of a battery cell. Each set of tab mounting holes includes a first mounting hole and a second mounting hole. The first rigid tab is inserted into the first mounting hole and welded to the first tab of the corresponding battery cell. The second rigid tab is inserted into the second mounting hole and welded to the second tab of the corresponding battery cell. The tab sleeve is cut along two adjacent sets of tab mounting holes to obtain multiple battery cell modules.

[0007] Optionally, both the tab structure and the battery cell are mounted on a welding base, and a dual-head welding machine is used to simultaneously weld the first hard tab and the second hard tab to the battery cell.

[0008] Optionally, the battery cell module is placed in a tab bending fixture, and the first tab and the second tab are bent using the tab fixture.

[0009] Optionally, a first tab adhesive is provided on the first rigid tab, and a second tab adhesive is provided on the second rigid tab. The first tab adhesive is attached to the side of the first rigid tab closest to the battery cell, and the second tab adhesive is attached to the side of the second rigid tab closest to the battery cell.

[0010] The present invention also discloses a soft-pack lithium-ion battery, which is manufactured using the above-described method for manufacturing soft-pack lithium-ion batteries.

[0011] The present invention also discloses a soft-pack lithium-ion battery, comprising: a single cell and a tab structure. A first tab and a second tab are disposed on one side of the single cell. The tab structure includes a tab sleeve, a first rigid tab, and a second rigid tab. A first mounting hole and a second mounting hole are formed on the tab sleeve. The first mounting hole and the second mounting hole are parallel to each other and maintain a preset distance. The first rigid tab is disposed in the first mounting hole and extends outwards along both ends of the tab sleeve. The second rigid tab is disposed in the second mounting hole and extends outwards along both ends of the tab sleeve. The extension directions of the first rigid tab and the second rigid tab on the tab sleeve are parallel to each other. The first tab is connected to the first rigid tab, and the second tab is connected to the second rigid tab.

[0012] Optionally, the first mounting hole and the second mounting hole are located on the same horizontal plane.

[0013] Optionally, along the extending direction of the first hard electrode tab and the second hard electrode tab, the first hard electrode tab is slidably disposed in the first mounting hole, and the second hard electrode tab is slidably disposed in the second mounting hole.

[0014] Optionally, a first tab adhesive is provided on the first rigid tab, and a second tab adhesive is provided on the second rigid tab. The first tab adhesive is attached to the side of the first rigid tab closest to the battery cell, and the second tab adhesive is attached to the side of the second rigid tab closest to the battery cell.

[0015] Compared with the prior art, the manufacturing method of the soft-pack lithium-ion battery and the beneficial effects of the soft-pack lithium-ion battery provided by the embodiments of the present invention are as follows: The manufacturing method of the soft-pack lithium-ion battery involves placing a first hard tab and a second hard tab on a tab sleeve, so that the first hard tab and the second hard tab are arranged parallel to each other in the tab sleeve to obtain a tab structure. The tab structure is then connected to the cell unit. Specifically, the first hard tab is welded to a first tab on one side of the cell unit, and the second hard tab is welded to a second tab on one side of the cell unit to obtain a cell module. This ensures the consistency of the spacing between the first hard tab and the second hard tab, and avoids the phenomenon of the first hard tab and the second hard tab being misaligned. The cell module is then sequentially packaged, injected with electrolyte, and resealed to obtain a soft-pack lithium-ion battery, ensuring the production qualification rate of the soft-pack lithium-ion battery. Attached Figure Description

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0017] Figure 1 This is a manufacturing process diagram of the soft-pack lithium-ion battery provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the unfolded structure of the rolled hard electrode tab provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of several tab units inserted into the tab sleeve provided in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the electrode structure and multiple battery cells provided in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the cutting position of the tab sleeve provided in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of multiple battery cell modules provided in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of multiple soft-pack lithium-ion batteries provided in the embodiments of the present invention;

[0024] Figure 8 This is a schematic diagram of the electrode structure provided in an embodiment of the present invention;

[0025] Figure 9 This is a side view of the tab sleeve provided in an embodiment of the present invention.

[0026] The figures are labeled as follows: 10, rolled hard tab; 110, first hard tab; 111, first tab adhesive; 120, second hard tab; 121, second tab adhesive; 20, tab sleeve; 201, first mounting hole; 202, second mounting hole; 30, single cell; 310, first tab; 320, second tab; 40, welding base; 510, first cutting blade; 520, second cutting blade; 60, clamping component; 70, dual-head welding machine; 80, soft-pack lithium-ion battery. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] This invention provides a method for manufacturing a soft-pack lithium-ion battery 80, such as... Figure 1 As shown, the method includes the following steps:

[0029] S10. Take the rolled hard electrode tab 10, unfold the rolled hard electrode tab 10 and cut it to obtain several hard electrode tab units, each hard electrode tab unit including a first hard electrode tab 110 and a second hard electrode tab 120 that are set independently.

[0030] S20. Clamp the first hard electrode tab 110 and the second hard electrode tab 120 respectively and insert them into the electrode tab sleeve 20 so that the first hard electrode tab 110 and the second hard electrode tab 120 are arranged parallel to each other in the electrode tab sleeve 20, thus obtaining the electrode tab structure.

[0031] S30. Weld the first hard tab 110 to the first tab 310 provided on one side of the battery cell 30, and weld the second hard tab 120 to the second tab 320 provided on one side of the battery cell 30 to obtain the battery cell module.

[0032] S40. The cell module is sequentially packaged, injected with electrolyte, and resealed to obtain a soft-pack lithium-ion battery 80.

[0033] Reference Figures 1 to 7The manufacturing method of the above-mentioned soft-pack lithium-ion battery 80 involves placing the first hard tab 110 and the second hard tab 120 on the tab sleeve 20, so that the first hard tab 110 and the second hard tab 120 are arranged parallel to each other on the tab sleeve 20 to obtain a tab structure. The tab structure is then connected to the cell 30. Specifically, the first hard tab 110 is welded to the first tab 310 on one side of the cell 30, and the second hard tab 120 is welded to the second tab 320 on one side of the cell 30 to obtain a cell module. This method ensures the consistency of the spacing between the first hard tab 110 and the second hard tab 120 and avoids the phenomenon of the first hard tab 110 and the second hard tab 120 being misaligned. The cell module is then sequentially packaged, injected with electrolyte, and resealed to obtain the soft-pack lithium-ion battery 80, ensuring the production qualification rate of the soft-pack lithium-ion battery 80.

[0034] The aforementioned rolled hard electrode tab 10 is used to provide independently configured first hard electrode tab 110 and second hard electrode tab 120. The above-mentioned cutting of the rolled hard electrode tab 10 is carried out using a first cutting blade 510 to obtain several electrode tab units.

[0035] As a preferred embodiment, refer to Figure 3 Along the length of the tab sleeve 20, multiple sets of tab mounting holes are formed on the tab sleeve 20. A battery cell 30 is provided on one side of each set of tab mounting holes. Each set of tab mounting holes includes a first mounting hole 201 and a second mounting hole 202. A first hard tab 110 is inserted into the first mounting hole 201 and welded to the first tab 310 of the corresponding battery cell 30. A second hard tab 120 is inserted into the second mounting hole 202 and welded to the second tab 320 of the corresponding battery cell 30. The tab sleeve 20 is cut along two adjacent sets of tab mounting holes to obtain multiple battery cell modules.

[0036] Figure 3 The direction of the middle arrow indicates the insertion direction of the first hard electrode tab 110 and the second hard electrode tab 120 on the electrode tab sleeve 20.

[0037] In the actual production process of soft-pack lithium-ion batteries 80, the manufacturing method of this embodiment can significantly improve the production efficiency of soft-pack lithium-ion batteries 80. Specifically, along the length direction of the tab sleeve 20, multiple sets of tab mounting holes are formed on the tab sleeve 20. A cell 30 is set on one side of each set of tab mounting holes. Each set of tab mounting holes includes a first mounting hole 201 and a second mounting hole 202. A first hard tab 110 is inserted into the first mounting hole 201 and welded to the first tab 310 of the corresponding cell 30. A second hard tab 120 is inserted into the second mounting hole 202 and welded to the second tab 320 of the corresponding cell 30. The tab sleeve 20 is cut along two adjacent sets of tab mounting holes to obtain multiple cell modules. The above method can quickly obtain multiple cell modules. Then, the above multiple cell modules are sequentially packaged, injected with electrolyte, and resealed to obtain multiple soft-pack lithium-ion batteries 80, thereby improving the production efficiency of soft-pack lithium-ion batteries 80.

[0038] Reference Figure 5 The above-mentioned tab sleeve 20 is cut using a second cutting blade 520 to obtain multiple battery cell modules.

[0039] Reference Figures 2 to 6 An example of manufacturing three pouch lithium-ion batteries 80 is given. The number of pouch lithium-ion batteries 80 manufactured can be adjusted according to actual needs.

[0040] As a preferred embodiment, refer to Figure 4 Both the tab structure and the cell unit 30 are located on the welding base 40. The first hard tab 110 and the second hard tab 120 are simultaneously welded to the cell unit 30 using a dual-head welding machine 70.

[0041] The aforementioned welding base 40 is used to provide a stable welding environment, improve the connection efficiency between the tab structure and the battery cell 30, and the dual-head welding machine 70 can simultaneously weld the first hard tab 110 and the second hard tab 120 to the battery cell 30, thereby improving work efficiency.

[0042] As a preferred embodiment, the battery cell module is placed in the tab bending fixture, and the first tab 310 and the second tab 320 are bent using the tab fixture.

[0043] The aforementioned tab clamp is an existing tool used to process battery cell modules.

[0044] As a preferred embodiment, refer to Figures 2 to 7A first tab adhesive 111 is provided on the first hard tab 110, and a second tab adhesive 121 is provided on the second hard tab 120. The first tab adhesive 111 is attached to the side of the first hard tab 110 near the cell 30, and the second tab adhesive 121 is attached to the side of the second hard tab 120 near the cell 30.

[0045] The first tab adhesive 111 and the second tab adhesive 121 are provided to isolate the first hard tab 110 and the second hard tab 120, prevent short circuits, and ensure the normal operation and safety of the soft-pack lithium-ion battery 80 circuit.

[0046] This application also discloses a soft-pack lithium-ion battery 80, which is manufactured using the above-described method for manufacturing soft-pack lithium-ion batteries 80.

[0047] This application also discloses a soft-pack lithium-ion battery 80, see reference. Figures 6 to 9 The battery cell includes a single cell 30 and a tab structure. The single cell 30 has a first tab 310 and a second tab 320 on one side. The tab structure includes a tab sleeve 20, a first hard tab 110 and a second hard tab 120. The tab sleeve 20 has a first mounting hole 201 and a second mounting hole 202. The first mounting hole 201 and the second mounting hole 202 are parallel to each other with a preset distance. The first hard tab 110 is located in the first mounting hole 201 and extends outward along both ends of the tab sleeve 20. The second hard tab 120 is located in the second mounting hole 202 and extends outward along both ends of the tab sleeve 20. The extension directions of the first hard tab 110 and the second hard tab 120 on the tab sleeve 20 are parallel to each other. The first tab 310 is connected to the first hard tab 110, and the second tab 320 is connected to the second hard tab 120.

[0048] The soft-pack lithium-ion battery 80 in this embodiment refers to... Figure 8The consistency of the connection between the first hard electrode tab 110 and the second hard electrode tab 120 is achieved by placing the first hard electrode tab 110 and the second hard electrode tab 120 on the electrode tab sleeve 20. Specifically, a first mounting hole 201 and a second mounting hole 202 are formed on the electrode tab sleeve 20, and the first mounting hole 201 and the second mounting hole 202 are set parallel to each other with a preset distance. The first hard electrode tab 110 is placed in the first mounting hole 201 and extends outward along both ends of the electrode tab sleeve 20, and the second hard electrode tab 120 is placed in the second mounting hole 202 and extends outward along both ends of the electrode tab sleeve 20. The two ends of the tube 20 extend outward to position the first hard tab 110 and the second hard tab 120, achieving parallel arrangement of the first hard tab 110 and the second hard tab 120 on the tab sleeve 20. After connecting the above tab structure to the first and second electrode plates of the cell 30 one by one, the consistency of the spacing between the first hard tab 110 and the second hard tab 120 can be ensured, avoiding the phenomenon of the first hard tab 110 and the second hard tab 120 being skewed, and further improving the production qualification rate of the soft-pack lithium-ion battery 80.

[0049] The preset spacing between the first mounting hole 201 and the second mounting hole 202 can be adjusted according to the spacing between the first electrode and the second electrode of the battery cell 30, and no specific limitation is made here.

[0050] Reference Figure 8 In the soft-pack lithium-ion battery 80 of this embodiment, the center-to-center distance L between the first hard tab 110 and the second hard tab 120 is consistent with the center-to-center distance between the first electrode and the second electrode of the cell 30.

[0051] As a preferred embodiment, refer to Figure 9 The first mounting hole 201 and the second mounting hole 202 are located on the same horizontal plane.

[0052] The aforementioned first mounting hole 201 and second mounting hole 202 facilitate the installation of the first hard tab 110 and the second hard tab 120, and improve the operability and convenience of connecting the tab structure with the first and second plates of the cell 30. This, in turn, improves the spacing consistency of the first hard tab 110 and the second hard tab 120 after connection, further prevents tab misalignment, and improves the production qualification rate of the soft-pack lithium-ion battery 80.

[0053] As a preferred embodiment, refer to Figure 8 Along the extending direction of the first hard electrode tab 110 and the second hard electrode tab 120, the first hard electrode tab 110 is slidably disposed in the first mounting hole 201, and the second hard electrode tab 120 is slidably disposed in the second mounting hole 202.

[0054] The sliding of the first hard tab 110 and the second hard tab 120 on the tab sleeve 20 allows for adjustment of their positions on the tab sleeve 20. This adjustment is made to adjust the connection point between the first hard tab 110 and the first electrode plate of the battery cell body, and the connection point between the second hard tab 120 and the second electrode plate of the battery cell body, according to actual connection requirements, thereby improving the adaptability of the tab structure to the battery cell body.

[0055] Reference Figure 9 The first mounting hole 201 and the second mounting hole 202 have a rectangular cross-section along the height of the tab sleeve 20. The structure of the first mounting hole 201 and the second mounting hole 202 is designed to match the first hard tab 110 and the second hard tab 120, improving the stability of the first hard tab 110 and the second hard tab 120 on the tab sleeve 20. This ensures the stability of the tab structure when connected to the cell body, improves the consistency of the spacing between the first hard tab 110 and the second hard tab 120 after the tab structure is connected to the cell, further avoids tab misalignment, and improves the production qualification rate of the soft-pack lithium-ion battery 80.

[0056] Reference Figure 9 The Z direction is the height direction of the tab sleeve 20.

[0057] The tab sleeve 20 is made of an elastic material. When the first hard tab 110 and the second hard tab 120 are installed, the tab sleeve 20 is stretched along its length to increase the length of the first mounting hole 201 and the second mounting hole 202. At this time, when the first hard tab 110 and the second hard tab 120 are placed on the tab sleeve 20, it can prevent the first hard tab 110 and the second hard tab 120 from contacting and rubbing against the tab sleeve 20, reduce the wear on the first hard tab 110 and the second hard tab 120 themselves, and improve the production qualification rate of the soft-pack lithium-ion battery 80. When the first hard tab 110 and the second hard tab 120 are installed in place, the stretching force is removed so that the first hard tab 110 and the second hard tab 120 are fixed on the tab sleeve 20.

[0058] Reference Figure 2 The tab sleeve 20 is made of elastic material, which makes it easy to wind the tab sleeve 20 into the roll structure, making it easy to store the tab sleeve 20. The tab sleeve 20 can be unfolded according to the usage requirements to realize the manufacturing of the soft-pack lithium-ion battery 80 in this embodiment.

[0059] Reference Figure 9 The X direction is the length direction of the tab sleeve 20.

[0060] As a preferred embodiment, a first tab adhesive 111 is provided on the first hard tab 110, and a second tab adhesive 121 is provided on the second hard tab 120. The first tab adhesive 111 is attached to the side of the first hard tab 110 near the cell 30, and the second tab adhesive 121 is attached to the side of the second hard tab 120 near the cell 30.

[0061] The first tab adhesive 111 and the second tab adhesive 121 are used to isolate the first hard tab 110 and the second hard tab 120, prevent short circuits, and ensure the normal operation and safety of the soft-pack lithium-ion battery 80 circuit.

[0062] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.

Claims

1. A method for manufacturing a soft-pack lithium-ion battery, characterized in that, Includes the following steps: Take a rolled hard electrode tab, unfold the rolled hard electrode tab and cut it into several hard electrode tab units, each hard electrode tab unit including an independently set first hard electrode tab and second hard electrode tab. The electrode sleeve is provided with several sets of parallel first mounting holes and second mounting holes along its length; the electrode sleeve is made of elastic material. The first hard electrode tab and the second hard electrode tab are clamped and inserted into the electrode tab sleeve so that the first hard electrode tab and the second hard electrode tab are arranged parallel to each other in the electrode tab sleeve, thus obtaining the electrode tab structure. The first hard electrode tab is welded to the first electrode tab on one side of the battery cell, and the second hard electrode tab is welded to the second electrode tab on one side of the battery cell. The electrode tab structure and the battery cell are both located on the welding base. The first hard electrode tab and the second hard electrode tab are welded to the battery cell simultaneously using a dual welding head welding machine to obtain a battery cell module. The cell module is sequentially packaged, injected with electrolyte, and resealed to obtain a soft-pack lithium-ion battery.

2. The method for manufacturing a soft-pack lithium-ion battery according to claim 1, characterized in that, Along the length of the tab sleeve, multiple sets of tab mounting holes are formed on the tab sleeve. Each set of tab mounting holes is provided with a battery cell on one side. Each set of tab mounting holes includes a first mounting hole and a second mounting hole. The first rigid tab is inserted into the first mounting hole and welded to the first tab of the corresponding battery cell. The second rigid tab is inserted into the second mounting hole and welded to the second tab of the corresponding battery cell. The electrode sleeve is cut along two adjacent sets of electrode mounting holes to obtain multiple battery cell modules.

3. The method for manufacturing a soft-pack lithium-ion battery according to claim 1, characterized in that, The battery cell module is placed in the tab bending fixture, and the first tab and the second tab are bent using the tab fixture.

4. The method for manufacturing a soft-pack lithium-ion battery according to claim 1, characterized in that, The first hard electrode tab is provided with a first electrode tab adhesive, and the second hard electrode tab is provided with a second electrode tab adhesive. The first electrode tab adhesive is attached to the side of the first hard electrode tab closest to the battery cell, and the second electrode tab adhesive is attached to the side of the second hard electrode tab closest to the battery cell.

5. A soft-pack lithium-ion battery, characterized in that, It is manufactured using the manufacturing method of the soft-pack lithium-ion battery according to any one of claims 1 to 4.

6. A soft-pack lithium-ion battery, characterized in that, include: A single battery cell, wherein a first tab and a second tab are provided on one side of the single battery cell; The electrode structure includes an electrode sleeve, a first hard electrode, and a second hard electrode. The electrode sleeve has several sets of parallel first and second mounting holes along its length. The electrode sleeve is made of an elastic material. The first and second mounting holes are parallel to each other with a preset distance between them. The first hard electrode is disposed in the first mounting hole and extends outward along both ends of the electrode sleeve. The second hard electrode is disposed in the second mounting hole and extends outward along both ends of the electrode sleeve. The extension directions of the first and second hard electrodes on the electrode sleeve are parallel to each other. The first electrode tab is connected to the first rigid electrode tab, and the second electrode tab is connected to the second rigid electrode tab; The first mounting hole and the second mounting hole are located on the same horizontal plane; The first hard electrode tab is provided with a first electrode tab adhesive, and the second hard electrode tab is provided with a second electrode tab adhesive. The first electrode tab adhesive is attached to the side of the first hard electrode tab closest to the battery cell, and the second electrode tab adhesive is attached to the side of the second hard electrode tab closest to the battery cell. Along the extending directions of the first hard electrode tab and the second hard electrode tab, the first hard electrode tab is slidably disposed in the first mounting hole, and the second hard electrode tab is slidably disposed in the second mounting hole.

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