A battery cell, a soft-pack battery, an electric device and a method for preparing a soft-pack battery

Abstract

The present invention belongs to the field of soft-pack batteries, and in particular, relates to a battery cell, a soft-pack battery, an electrical device, and a method for preparing a soft-pack battery. In order to solve the problem in the prior art that a Tab connector needs to be welded on the tab, which results in a low volume energy density of the soft-pack battery, a large impedance and severe heat generation at the welding point, poor power performance, poor reliability, and potential safety hazards, the battery cell of the present invention includes positive and negative pole tabs. When the number of the same-pole tabs is one, the corresponding tabs serve as corresponding conductive structures. When the number of the same-pole tabs is at least two, all the same-pole tabs are sealed and connected to form corresponding conductive structures. The present invention also proposes a method for preparing a soft-pack battery, an electrical device, and a soft-pack battery comprising the above-mentioned battery cell. Using the tabs as conductive structures can omit the Tab connector and the welding area, improve the volume energy density of the soft-pack battery and the battery cell, and eliminate the potential safety hazards caused by metal shavings generated by welding entering the battery cell.

Description

Technical Field

[0001] The present invention belongs to the field of soft-pack batteries, and in particular relates to a battery core, a soft-pack battery, an electrical device and a method for preparing the soft-pack battery. Background Art

[0002] Due to the simple structure and light weight of soft-pack batteries, they are widely used in some fields that have high requirements on battery weight, such as drones.

[0003] like Figure 1 and 3 As shown, the soft-pack battery includes a packaging film 15, a positive electrode connecting sheet 1, a negative electrode connecting sheet 2 (the positive electrode connecting sheet 1 and the negative electrode connecting sheet 2 are Tab connecting sheets) and a battery cell 13. The battery cell 13 includes a positive electrode sheet and a negative electrode sheet. The positive electrode sheet is provided with a positive electrode tab 3, and the negative electrode sheet is provided with a negative electrode tab 4. In the production process of the soft-pack battery, the positive electrode sheet and the negative electrode sheet can both be one, and the positive electrode sheet and the negative electrode sheet can be rolled together through a sheet rolling step, and when the number of the same-pole tabs is more than two, the same-pole tabs are aggregated together; or, all the positive electrode sheets and negative electrode sheets are stacked together through a sheet stacking step, and when the number of the same-pole tabs is more than two, the same-pole tabs are aggregated together. Afterwards, the positive electrode connecting sheet 1 and the negative electrode connecting sheet 2 for electrical connection with the electrical equipment are welded on all the positive electrode tabs 3 and all the negative electrode tabs 4 of the battery cell 13, respectively. The positive electrode tab 3 and the positive electrode connecting sheet 1 together constitute the positive electrode conductive structure, the negative electrode tab 4 and the negative electrode connecting sheet 2 together constitute the negative electrode conductive structure, and the positive electrode conductive structure and the negative electrode conductive structure together constitute the conductive structure for electrical connection with the electrical equipment. The positive electrode connecting sheet 1 and the negative electrode connecting sheet 2 are both sealed and connected to the packaging film 15 by hot melt adhesive to form a packaging film seal, wherein the positive electrode connecting sheet 1 is generally an aluminum connecting sheet, and the negative electrode connecting sheet 2 is generally a copper connecting sheet or a nickel connecting sheet. For example, a Chinese invention patent application with application publication number CN117525762A and application publication date 2024.02.06 discloses a soft-pack battery comprising a first Tab sheet (i.e., Tab connecting sheet) and a second Tab sheet (i.e., Tab connecting sheet).

[0004] When the number of the same-pole tabs is one, the corresponding Tab connecting piece is mainly used to be sealed and connected with the packaging film 15 to realize the packaging of the soft-pack battery, thereby preventing the battery from leaking and preventing foreign matter such as dust and moisture from entering the packaging film 15; when the number of the same-pole tabs is at least two, the corresponding Tab connecting piece is simultaneously used to be sealed and connected with the packaging film 15 and to electrically connect all the same-pole tabs, thereby preventing the battery from leaking and preventing foreign matter such as dust and moisture from entering the packaging film 15 through the gaps between the same-pole tabs.

[0005] In the prior art, such as Figure 1 and 3As shown, in order to realize the welding connection between the positive electrode connecting piece 1 and the positive electrode tab 3, a welding area 5 is formed at one end of the positive electrode tab 3, and the positive electrode connecting piece 1 is welded to the welding area 5 of the positive electrode tab 3; similarly, a welding area 5 is also formed at one end of the negative electrode tab, and the welding area 5 of the negative electrode connecting piece 2 is welded to the welding area 5 of the negative electrode tab 4. After the punching step, the packaging film 15 has a receiving pit 14 for accommodating the battery cell 13, a welding reserved area 51 corresponding to the welding area 5, and a top sealing area 7 (i.e., a sealing area) for ensuring the sealing of the soft-pack battery. When manufacturing the soft-pack battery, the battery cell 13 is installed in the receiving pit 14, and the welding connection between the Tab connecting piece and the corresponding tab is realized at the welding reserved area 51 of the packaging film 15, and the overall sealing of the soft-pack battery is realized by the sealing between the top sealing area 7 and the corresponding Tab connecting piece and the sealing between the top sealing areas 7. Of course, in the soft-pack battery with the conductive structure extending from the side, the top sealing area 7 can also be changed into a side sealing area (i.e., a sealing area).

[0006] In the soft-pack battery in the prior art, since it is necessary to weld the Tab connecting piece on the pole ear, on the one hand, the welding structure of the pole ear and the Tab connecting piece needs to occupy a certain space, and it is necessary to reserve welding dimensions on the pole piece and the Tab connecting piece, resulting in a low volume energy density of the soft-pack battery; on the other hand, welding slag, metal debris and other metal foreign matter will be generated in the welding process, and these metal foreign matter will enter the battery cell 13, resulting in quality problems such as excessive self-discharge and poor consistency in the soft-pack battery, and even causing the soft-pack battery to short-circuit and trigger thermal runaway of the battery, posing a safety hazard; on the other hand, the resistance at the welding point between the pole piece and the Tab connecting piece is large, and the heat generated by the resistance at the welding point is large, resulting in poor power performance and poor reliability of the soft-pack battery. Summary of the invention

[0007] The object of the present invention is to provide a battery cell to solve the technical problems in the prior art that a Tab connecting piece needs to be welded on the positive and negative pole tabs of the battery cell to form a conductive structure. Since welding dimensions need to be reserved on the pole tabs and the Tab connecting piece, metal welding slag foreign matter that can enter the battery cell will be generated during the welding process, and the contact resistance at the welding point between the pole piece and the Tab connecting piece is large, the volume energy density of the soft-pack battery is low, the power performance is poor, the reliability is poor, the heat generated at the welding point is large, and there are safety hazards.

[0008] The present invention also aims to provide a soft-pack battery to solve the same technical problem as above.

[0009] The present invention also aims to provide an electrical device to solve the same technical problem as above.

[0010] The present invention also aims to provide a method for preparing a soft-pack battery to solve the same technical problem as above.

[0011] To achieve the above purpose, the technical solution of the battery cell provided by the present invention is:

[0012] A battery cell comprises a positive electrode tab and a negative electrode tab. When there is one positive electrode tab, the single positive electrode tab constitutes a positive electrode conductive structure. When there are at least two positive electrode tabs, all the positive electrode tabs are sealed and connected to form a positive electrode conductive structure. When there is one negative electrode tab, the single negative electrode tab constitutes a negative electrode conductive structure. When there are at least two negative electrode tabs, all the negative electrode tabs are sealed and connected to form a negative electrode conductive structure.

[0013] Furthermore, when the number of the same-pole tabs is at least two, the same-pole tabs are sealed and connected by metal hot melting to form a corresponding conductive structure.

[0014] Furthermore, when the number of the same-pole tabs is at least two, a hot-melt adhesive coating area is provided on the tab, and the same-pole tab and the hot-melt adhesive are squeezed into a whole after melting to form a corresponding conductive structure.

[0015] Furthermore, when the number of the same-pole tabs is at least two, an injection molding area is provided on the tab, and the same-pole tabs are injection molded once with a sealant to seal and connect the same-pole tabs and form a corresponding conductive structure.

[0016] Furthermore, the sealant corresponding to the positive electrode conductive structure is a conductive glue, and the plastic area composed of the conductive glue has a groove for inserting the packaging film. The groove wall is provided with a boss for conductive contact with the metal part of the packaging film to reduce the potential difference between the positive electrode ear and the packaging film.

[0017] Furthermore, the sealant corresponding to the positive electrode conductive structure is a conductive glue. In the arrangement direction of the positive electrode tabs, the plastic area formed by the conductive glue is provided with bosses on both sides away from the positive electrode tabs for conductive contact with the metal part of the packaging film, so as to reduce the potential difference between the positive electrode tabs and the packaging film.

[0018] Furthermore, both the positive electrode conductive structure and the negative electrode conductive structure are provided with a hot melt adhesive layer for sealingly connecting with the packaging film. The hot melt adhesive layer includes a packaging area for cooperating with the packaging film to form a packaging film seal. The extension direction of the conductive structure is defined as the longitudinal direction. Both lateral ends of the hot melt adhesive layer protrude from the corresponding conductive structure, and both longitudinal ends of the hot melt adhesive layer protrude from the packaging area.

[0019] The beneficial effects of the battery cell of the present invention are as follows: the present invention is an improved invention. By using the pole ear as a conductive structure, the positive electrode connecting sheet and the negative electrode connecting sheet can be omitted, thereby eliminating the welding area on the pole ear, which is beneficial to improving the volume energy density of the soft-pack battery and the battery cell; at the same time, since there is no need to weld the positive electrode connecting sheet and the negative electrode connecting sheet, it is possible to avoid the generation of metal welding slag foreign matter that can enter the battery cell, thereby ensuring the quality of the soft-pack battery and eliminating safety hazards. At the same time, since the welding area is eliminated, after the battery cell is applied to the soft-pack battery, the heat generation of the soft-pack battery can be effectively reduced, and the power performance and reliability of the soft-pack battery can be improved.

[0020] To achieve the above purpose, the technical solution of the soft-pack battery provided by the present invention is:

[0021] A soft-pack battery comprises a packaging film and a battery cell. The packaging film is provided with a receiving pit and a sealing area. The battery cell is installed in the receiving pit. The battery cell comprises a positive electrode tab and a negative electrode tab. When there is one positive electrode tab, the single positive electrode tab constitutes a positive electrode conductive structure. When there are at least two positive electrode tabs, all the positive electrode tabs are sealed and connected to form a positive electrode conductive structure. When there is one negative electrode tab, the single negative electrode tab constitutes a negative electrode conductive structure. When there are at least two negative electrode tabs, all the negative electrode tabs are sealed and connected to form a negative electrode conductive structure. The conductive structure is sealed and connected to the sealing area, and the receiving pit is close to the sealing area.

[0022] Furthermore, when the number of the same-pole tabs is at least two, the same-pole tabs are sealed and connected by metal hot melting to form a corresponding conductive structure.

[0023] Furthermore, when the number of the same-pole tabs is at least two, a hot-melt adhesive coating area is provided on the tab, and the same-pole tab and the hot-melt adhesive are squeezed into a whole after melting to form a corresponding conductive structure.

[0024] Furthermore, when the number of the same-pole tabs is at least two, an injection molding area is provided on the tab, and the same-pole tabs are injection molded once with a sealant to seal and connect the same-pole tabs and form a corresponding conductive structure.

[0025] Furthermore, the sealant corresponding to the positive electrode conductive structure is a conductive glue, and the plastic area composed of the conductive glue has a groove for inserting the packaging film. The groove wall is provided with a boss for conductive contact with the metal part of the packaging film to reduce the potential difference between the positive electrode ear and the packaging film.

[0026] Furthermore, the sealant corresponding to the positive electrode conductive structure is a conductive glue. In the arrangement direction of the positive electrode tabs, the plastic area formed by the conductive glue is provided with bosses on both sides away from the positive electrode tabs for conductive contact with the metal part of the packaging film, so as to reduce the potential difference between the positive electrode tabs and the packaging film.

[0027] Furthermore, both the positive electrode conductive structure and the negative electrode conductive structure are provided with a hot melt adhesive layer for sealingly connecting with the packaging film. The hot melt adhesive layer includes a packaging area for cooperating with the packaging film to form a packaging film seal. The extension direction of the conductive structure is defined as the longitudinal direction. Both lateral ends of the hot melt adhesive layer protrude from the corresponding conductive structure, and both longitudinal ends of the hot melt adhesive layer protrude from the packaging area.

[0028] The beneficial effects of the soft-pack battery in the present invention are as follows: the present invention is an improved invention. The battery cell can be easily installed through the receiving pit, and the sealing area can realize the sealing connection between the packaging film and the battery cell, thereby ensuring the sealing of the soft-pack battery; by using the pole ear as a conductive structure, the positive electrode connecting sheet and the negative electrode connecting sheet can be omitted, thereby eliminating the welding area on the pole ear. On this basis, the receiving pit is close to the sealing area, which is conducive to improving the volume energy density of the soft-pack battery and the battery cell. At the same time, since there is no need to weld the positive electrode connecting sheet and the negative electrode connecting sheet, no metal welding slag foreign matter that can enter the battery cell will be generated, thereby ensuring the quality of the soft-pack battery and eliminating safety hazards. At the same time, since the welding area is cancelled, the heat generation of the soft-pack battery can be effectively reduced, and the power performance and reliability of the soft-pack battery can be improved.

[0029] To achieve the above-mentioned purpose, the technical solution of the method for preparing the electrical equipment provided by the present invention is:

[0030] An electrical device comprises a soft-pack battery, wherein the soft-pack battery comprises a packaging film and a battery cell, wherein the packaging film is provided with a receiving pit and a sealing area, wherein the battery cell is installed in the receiving pit, wherein the battery cell comprises a positive electrode tab and a negative electrode tab, wherein when there is one positive electrode tab, the single positive electrode tab constitutes a positive electrode conductive structure, and when there are at least two positive electrode tabs, all the positive electrode tabs are sealed and connected to form a positive electrode conductive structure; when there is one negative electrode tab, the single negative electrode tab constitutes a negative electrode conductive structure, and when there are at least two negative electrode tabs, all the negative electrode tabs are sealed and connected to form a negative electrode conductive structure; the conductive structure is sealed and connected to the sealing area, and the receiving pit is close to the sealing area.

[0031] Furthermore, when the number of the same-pole tabs is at least two, the same-pole tabs are sealed and connected by metal hot melting to form a corresponding conductive structure.

[0032] Furthermore, when the number of the same-pole tabs is at least two, a hot-melt adhesive coating area is provided on the tab, and the same-pole tab and the hot-melt adhesive are squeezed into a whole after melting to form a corresponding conductive structure.

[0033] Furthermore, when the number of the same-pole tabs is at least two, an injection molding area is provided on the tab, and the same-pole tabs are injection molded once with a sealant to seal and connect the same-pole tabs and form a corresponding conductive structure.

[0034] Furthermore, the sealant corresponding to the positive electrode conductive structure is a conductive glue, and the plastic area composed of the conductive glue has a groove for inserting the packaging film. The groove wall is provided with a boss for conductive contact with the metal part of the packaging film to reduce the potential difference between the positive electrode ear and the packaging film.

[0035] Furthermore, the sealant corresponding to the positive electrode conductive structure is a conductive glue. In the arrangement direction of the positive electrode tabs, the plastic area formed by the conductive glue is provided with bosses on both sides away from the positive electrode tabs for conductive contact with the metal part of the packaging film, so as to reduce the potential difference between the positive electrode tabs and the packaging film.

[0036] Furthermore, both the positive electrode conductive structure and the negative electrode conductive structure are provided with a hot melt adhesive layer for sealingly connecting with the packaging film. The hot melt adhesive layer includes a packaging area for cooperating with the packaging film to form a packaging film seal. The extension direction of the conductive structure is defined as the longitudinal direction. Both lateral ends of the hot melt adhesive layer protrude from the corresponding conductive structure, and both longitudinal ends of the hot melt adhesive layer protrude from the packaging area.

[0037] The beneficial effects of the electrical equipment in the present invention are as follows: the present invention is an invention with changed elements. The soft-pack battery in the prior art is changed to the soft-pack battery in the present invention, and the battery cell can be conveniently installed through the receiving pit, and the sealing connection between the packaging film and the battery cell can be achieved through the sealing area, thereby ensuring the sealing of the soft-pack battery; by using the pole ear as a conductive structure, the positive electrode connecting sheet and the negative electrode connecting sheet can be omitted, thereby eliminating the welding area on the pole ear, and on this basis, the receiving pit is made close to the sealing area, which is conducive to improving the volume energy density of the soft-pack battery and the battery cell. At the same time, since there is no need to weld the positive electrode connecting sheet and the negative electrode connecting sheet, no metal welding slag foreign matter that can enter the battery cell will be generated, thereby ensuring the quality of the soft-pack battery and eliminating safety hazards. At the same time, since the welding area is cancelled, the heat generation of the soft-pack battery can be effectively reduced, and the power performance and reliability of the electrical equipment can be improved.

[0038] To achieve the above object, the technical solution of the method for preparing a soft-pack battery provided by the present invention is:

[0039] A method for preparing a soft-pack battery comprises a punching step and a packaging film packaging step of sealingly connecting the conductive structure of a battery cell with a packaging film; when the number of the same-pole tabs is one, the tab directly constitutes the corresponding conductive structure, and when the number of the same-pole tabs is at least two, a sheet rolling step or a sheet stacking step of aggregating all the same-pole tabs together is provided between the punching step and the packaging film packaging step, and a sealing step is provided between the sheet rolling step or the sheet stacking step and the packaging film packaging step, in which all the same-pole tabs are sealed and connected to constitute the corresponding conductive structure; in the punching step, the accommodating pit is made to be close to the sealing area.

[0040] Furthermore, in the sealing step, all the same-polarity tabs are heated and pressurized so that adjacent same-polarity tabs are sealed and connected to form a corresponding conductive structure.

[0041] Furthermore, in the sealing step, the tabs of the same pole are sealed and connected by hot melting of metal.

[0042] Furthermore, in the sealing step, hot melt adhesive is provided on the pole ear, and the pole ear and the hot melt adhesive are melted and squeezed into a whole.

[0043] Furthermore, in the sealing step, the tabs of the same pole are injection molded into one body through a mold and a sealant to form a corresponding conductive structure.

[0044] Furthermore, the sealant corresponding to the positive electrode conductive structure is a conductive glue. During the injection molding process, a groove for inserting the packaging film is formed on the plastic area composed of the conductive glue, and a boss for conductively contacting the metal part of the packaging film is formed in the groove. In the packaging film packaging step, the metal part of the packaging film is conductively contacted with the boss to reduce the potential difference between the positive electrode ear and the packaging film.

[0045] Furthermore, the sealant corresponding to the positive electrode conductive structure is a conductive glue. In the arrangement direction of the positive electrode ear, during the injection molding process, the plastic area composed of the conductive glue is away from the two sides of the positive electrode ear to form a boss for conductive contact with the metal part of the packaging film. In the packaging film packaging step, the metal part of the packaging film is conductively contacted with the boss to reduce the potential difference between the positive electrode ear and the packaging film.

[0046] The beneficial effects of the preparation method of the soft-pack battery in the present invention are as follows: the present invention is an improved invention. Through the pit punching step, the accommodating pit for accommodating the battery cell can be close to the sealing area, and there is no need to set a welding reserved area between the accommodating pit and the sealing area, thereby improving the volume energy density of the soft-pack battery; through the stacking or rolling step, the same-pole pole pieces can be aggregated together; after the stacking or rolling step, the sealing step is performed, the same-pole tabs can be sealed and connected to form a corresponding conductive structure, eliminating the positive and negative electrode connecting sheets, thereby eliminating the welding area on the tabs, which is beneficial to improving the volume energy density of the soft-pack battery and the battery cell. At the same time, since welding is not required, no metal welding slag foreign matter that can enter the battery cell will be generated, eliminating safety hazards. At the same time, since the welding area is cancelled, the heat generation of the soft-pack battery can be effectively reduced, and the power performance and reliability of the soft-pack battery can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the structure of a soft-pack battery after welding the battery cell and the positive and negative electrode connecting plates in the prior art;

[0048] Figure 2It is a schematic diagram of the structure of the battery cell of the soft-pack battery in the present invention;

[0049] Figure 3 It is a schematic diagram of the structure of the packaging film in the prior art after the punching step;

[0050] Figure 4 It is a schematic diagram of the structure of the soft-pack battery in the present invention after the punching step;

[0051] Figure 5 It is a schematic structural diagram of the positive electrode coil in the specific embodiment 1 of the soft-pack battery in the present invention;

[0052] Figure 6 It is a schematic structural diagram of the negative electrode coil in the specific embodiment 1 of the soft-pack battery of the present invention;

[0053] Figure 7 It is a schematic structural diagram of the positive electrode sheet in the specific embodiment 1 of the soft-pack battery of the present invention;

[0054] Figure 8 It is a schematic structural diagram of the negative electrode sheet in the specific embodiment 1 of the soft-pack battery of the present invention;

[0055] Fig. 9 It is a schematic diagram of the structure of the battery cell in the specific embodiment 1 of the soft-pack battery of the present invention;

[0056] Fig.10 A front view of a soft-pack battery in the present invention compared with a soft-pack battery in the prior art;

[0057] Fig.11 A side view of a soft-pack battery in the present invention compared with a soft-pack battery in the prior art;

[0058] Fig.12 It is a schematic structural diagram of the positive electrode coil in the specific embodiment 2 of the soft-pack battery in the present invention;

[0059] Fig.13 It is a schematic structural diagram of the negative electrode coil in the specific embodiment 2 of the soft-pack battery in the present invention;

[0060] Fig.14 It is a schematic structural diagram of the positive electrode sheet in the specific embodiment 2 of the soft-pack battery in the present invention;

[0061] Fig.15 It is a schematic structural diagram of the negative electrode sheet in the specific embodiment 2 of the soft-pack battery in the present invention;

[0062] Fig.16 It is a schematic diagram of the structure of the battery cell in the specific embodiment 2 of the soft-pack battery of the present invention;

[0063] Fig.17 It is a schematic structural diagram of the positive electrode sheet in the specific embodiment 3 of the soft-pack battery in the present invention;

[0064] Fig.18 It is a schematic structural diagram of the negative electrode sheet in the specific embodiment 3 of the soft-pack battery in the present invention;

[0065] Fig.19 It is a schematic diagram of the structure of the battery cell in the specific embodiment 4 of the soft-pack battery in the present invention;

[0066] Fig. 20 for Fig.19 AA structural diagram;

[0067] Fig.21 for Fig. 20 A magnified structural diagram of part B;

[0068] Fig. 22 It is a schematic diagram of the structure of the battery cell in the specific embodiment 5 of the soft-pack battery in the present invention;

[0069] Fig.23 for Fig. 22 Schematic diagram of CC structure;

[0070] Fig.24 for Fig.23 An enlarged view of the structure of part D.

[0071] Description of reference numerals:

[0072] 1. Positive electrode connecting piece; 2. Negative electrode connecting piece; 3. Positive electrode ear; 4. Negative electrode ear; 5. Welding area; 51. Welding reserved area; 6. Hot melt adhesive layer; 7. Top sealing area; 8. Positive electrode roll; 81. Positive electrode sheet; 9. Negative electrode roll; 91. Negative electrode sheet; 10. Slurry; 11. Hot melt adhesive coating area; 12. Hot melt adhesive hot melt sealing area; 13. Battery cell; 14. Receiving pit; 15. Packaging film; 16. Blank area; 17. Metal hot melt sealing area; 18. Injection molding area; 19. Plastic area; 20. Boss; 21. Existing soft pack battery; 22. Improved soft pack battery. DETAILED DESCRIPTION

[0073] The present invention is further described in detail below in conjunction with embodiments.

[0074] The battery cell referred to in the present invention is a bare battery cell, that is, a battery cell without a packaging film.

[0075] Specific embodiment 1 of the soft-pack battery provided by the present invention:

[0076] The purpose of this embodiment is to provide a soft-pack battery, which eliminates the positive electrode connecting sheet (i.e., Tab connecting sheet) and the negative electrode connecting sheet (i.e., Tab connecting sheet) by directly using the electrode ear as a conductive structure, and does not need to weld the positive electrode connecting sheet and the negative electrode connecting sheet, thereby improving the volume energy density, power performance and reliability of the soft-pack battery, ensuring the quality of the soft-pack battery and eliminating safety hazards.

[0077] like Figure 2 and Figure 5-9 As shown, as a specific embodiment, the soft-pack battery includes a packaging film 15 and a battery cell 13, and a receiving pit 14 and a sealing area are provided on the packaging film 15. The battery cell 13 is installed in the receiving pit 14. The battery cell 13 includes a positive electrode tab 3 and a negative electrode tab 4. There are two positive electrode tabs 3, and all positive electrode tabs 3 are sealed and connected to form a positive electrode conductive structure; there are two negative electrode tabs 4, and all negative electrode tabs 4 are sealed and connected to form a negative electrode conductive structure; a hot melt adhesive layer 6 is provided on the conductive structure, and the conductive structure is sealed and connected to the sealing area through the hot melt adhesive layer 6 to form a packaging film seal, and the receiving pit 14 is close to the sealing area. Specifically, the packaging film 15 is an aluminum-plastic film or other packaging films similar to aluminum-plastic film in the prior art. The packaging film 15 is a prior art and will not be described in detail here.

[0078] In other specific embodiments, the number of positive electrode tabs 3 may also be one, and a single positive electrode tab 3 constitutes a positive electrode conductive structure. Of course, in different specific embodiments, the number of positive electrode tabs 3 may also be three, four or other numbers. When the number of positive electrode tabs 3 is not less than two, all positive electrode tabs 3 are sealed and connected to form a positive electrode conductive structure. Similarly, the number of negative electrode tabs 4 may also be one, and a single negative electrode tab 4 constitutes a negative electrode conductive structure. Of course, in different specific embodiments, the number of negative electrode tabs 4 may also be three, four or other numbers. When the number of negative electrode tabs 4 is not less than two, all negative electrode tabs 4 are sealed and connected to form a negative electrode conductive structure. In this embodiment, the number of positive electrode tabs 3 and negative electrode tabs 4 is not limited, and the size relationship between the number of positive electrode tabs 3 and the number of negative electrode tabs 4 is not limited.

[0079] Among them, Figure 2 As shown, the positive electrode tab 3 and the negative electrode tab 4 are located on the same side of the battery cell 13, but in other specific embodiments, the positive electrode tab 3 and the negative electrode tab 4 can also be located on opposite sides or adjacent sides of the battery cell 13. In this embodiment, the arrangement positions of the positive electrode tab 3 and the negative electrode tab 4 are not limited.

[0080] The battery cell 13 can be easily installed through the accommodating pit 14, and the sealing area can realize the sealing connection between the packaging film 15 and the battery cell 13 to ensure the sealing of the soft pack battery; Figure 1-4 and Figure 10-11As shown, compared with the existing soft-pack battery 21, the improved soft-pack battery 22 in the present invention can omit the positive electrode connecting sheet 1 and the negative electrode connecting sheet 2 by using the pole ear as a conductive structure, thereby eliminating the welding area 5 on the pole ear. On this basis, the receiving pit 14 is close to the sealing area, which is conducive to improving the volume energy density of the soft-pack battery and the battery cell 13. At the same time, since there is no need to weld the positive electrode connecting sheet and the negative electrode connecting sheet, no metal welding slag foreign matter that can enter the battery cell 13 will be generated, thereby ensuring the quality of the soft-pack battery and eliminating safety hazards. At the same time, since the welding area 5 is eliminated, the heat generation of the soft-pack battery can be effectively reduced, and the power performance and reliability of the soft-pack battery can be improved.

[0081] like Figure 5-9 As shown, when the number of the same-pole tabs is at least two, in order to conveniently realize the sealed connection between the same-pole tabs, the same-pole tabs are sealed and connected by pressurized heating and hot melting to form a corresponding conductive structure. The sealed connection between the same-pole tabs is achieved by hot melting, and the process is mature and the reliability is high. Of course, in other specific embodiments, the same-pole tabs can also be sealed and connected by injection molding to form a corresponding conductive structure. The same-pole tabs are sealed and connected by non-welding methods, which can further prevent metal welding slag foreign matter generated by welding from entering the soft-pack battery.

[0082] like Figure 5-9 As shown, in order to achieve a sealed connection between the same-pole tabs, a hot-melt adhesive coating area 11 is provided on the tabs. After the same-pole tabs and the hot-melt adhesive are melted, they are squeezed into a whole and form a corresponding conductive structure.

[0083] Specifically, when preparing the positive electrode coil 8 and the negative electrode coil 9, the slurry 10 is coated in the middle of the current collector, and a blank is left at the edge of the current collector to form a blank area 16, and a hot melt adhesive is coated in the blank area 16 to form a hot melt adhesive coating area 11. The positive electrode sheet 81 and the negative electrode sheet 91 are obtained by rolling, striping, slicing, etc., and the hot melt adhesive coating area 11 is left at the positive electrode tab 3 and the negative electrode tab 4 of the positive electrode sheet 81 and the negative electrode sheet 91. After that, the positive electrode sheet 81, the negative electrode sheet 91 and the separator are laminated. After the lamination is completed, the hot melt adhesive coating area 11 on the same pole sheet overlaps to form a hot melt adhesive hot melt sealing area 12, and the hot melt adhesive hot melt sealing area 12 is pressurized and heated, and the same pole tab and the hot melt adhesive are melted and squeezed into a whole to form a corresponding conductive structure. By providing the hot melt adhesive coating area 11 on the tab, the tabs on the same pole can be conveniently sealed and connected using the hot melt adhesive, thereby ensuring the sealing of the soft-pack battery.

[0084] In order to improve the sealing performance of the soft pack battery, as a specific implementation method, Figure 2As shown, both the positive electrode conductive structure and the negative electrode conductive structure are provided with a hot melt adhesive layer 6 for sealingly connecting with the packaging film 15. The hot melt adhesive layer 6 includes a packaging area for cooperating with the packaging film 15 to form a packaging film seal. The extension direction of the conductive structure is defined as the longitudinal direction. Both lateral ends of the hot melt adhesive layer 6 protrude from the corresponding conductive structure, and both longitudinal ends of the hot melt adhesive layer 6 protrude from the packaging area.

[0085] The two lateral ends of the hot melt adhesive layer 6 are both protruded from the corresponding conductive structure, and the two longitudinal ends of the hot melt adhesive layer 6 are both protruded from the packaging area. When the conductive structure and the packaging film 15 are packaged together, the sealing between the conductive structure and the packaging film 15 can be improved, thereby improving the sealing of the soft-pack battery.

[0086] Of course, in other specific embodiments, in the connection direction of adjacent conductive structures, both ends of the hot melt adhesive layer 6 are flush with the corresponding conductive structure; or, the hot melt adhesive layer 6 is not provided on the conductive structure, but hot melt adhesive is provided on the corresponding area of ​​the packaging film 15. In this embodiment, there is no limitation on the sealing connection method between the conductive structure and the packaging film 15, and the connection method between the conductive structure and the packaging film 15 can be any method in the prior art.

[0087] As a specific implementation method, Figure 2 and 4 As shown, the conductive structures all extend from the top of the soft-pack battery, so the sealing area is the top sealing area 7 (the rectangular frame in the figure is only for illustration, and in fact, the area is a reserved blank area), and the receiving pit 14 is close to the top sealing area 7; but in other specific embodiments, the conductive structure can also extend from the side of the soft-pack battery, in which case the sealing area is the side sealing area, and the receiving pit 14 is close to the side sealing area; of course, the positive electrode conductive structure can also extend from the top of the soft-pack battery, and the negative electrode conductive structure can also extend from the bottom of the soft-pack battery. In this case, the sealing area is the top sealing area 7 and the bottom sealing area, and the positive electrode conductive structure is close to the top sealing area 7, and the negative electrode conductive structure is close to the bottom sealing area. In this embodiment, the specific structure of the sealing area is not limited.

[0088] After the packaging film 15 and the battery cell 13 are made into a dry battery cell, the electrolyte is injected, and the finished battery is made through processes such as formation and capacity separation.

[0089] Specific embodiment 2 of the soft pack battery provided by the present invention:

[0090] The purpose of this embodiment is to provide a different soft-pack battery, in which the metal tabs are directly pressurized and heated to achieve sealing between the tabs, that is, the tabs on the same pole are sealed and connected by hot melting of metal to form a corresponding conductive structure.

[0091] As a specific implementation method, Figure 12-16As shown, based on the specific embodiment 1 of the soft-pack battery, the same-pole tabs are melted and extruded into a whole to form a corresponding conductive structure.

[0092] Specifically, when preparing the positive electrode coil 8 and the negative electrode coil 9, the slurry 10 is coated in the middle of the current collector, and the edge of the current collector is left blank to form a blank area 16. Unlike the specific embodiment 1, the hot melt adhesive coating area 11 is not provided in the blank area 16. The positive electrode sheet 81 and the negative electrode sheet 91 are obtained by rolling, striping, slicing, etc., and the positive electrode sheet 81, the negative electrode sheet 91 and the separator are stacked. After the stacking is completed, the same pole sheets are overlapped to form a metal hot melt sealing area 17, and the metal hot melt sealing area 17 is pressurized and heated to melt the pole ears and seal the same pole ears.

[0093] Specific embodiment 3 of the soft pack battery provided by the present invention:

[0094] The purpose of this embodiment is to provide a different soft-pack battery, in which the pole pieces and the separator are wound and then the pole tabs of the same pole are heat-fused and composited to achieve sealing between the pole tabs.

[0095] As a specific implementation method, Figure 17-18 As shown, based on the specific embodiment 1 or 2 of the soft-pack battery, there is one positive electrode plate 81 and one negative electrode plate 91, and the same-pole ears are overlapped by winding to form a metal hot-melt sealing area 17 or a hot-melt adhesive hot-melt sealing area 12.

[0096] Specific embodiment 4 of the soft pack battery provided by the present invention:

[0097] The purpose of this embodiment is to provide a different soft-pack battery, in which the same-pole tabs are injection-molded at one time by a sealant to seal and connect the same-pole tabs and form a corresponding conductive structure.

[0098] As a specific implementation method, referring to Figure 12-16 On the basis of Fig.19 As shown, based on the specific embodiment 2 of the soft-pack battery, an injection molding process is used at the same-pole tabs to seal the tabs and form a corresponding conductive structure.

[0099] Specifically, when preparing the positive electrode coil 8 and the negative electrode coil 9, the slurry 10 is coated in the middle of the current collector, and the edge of the current collector is left blank to form a blank area 16. The positive electrode sheet 81 and the negative electrode sheet 91 are obtained by rolling, striping, slicing, etc., and the positive electrode sheet 81, the negative electrode sheet 91 and the separator are stacked. After the stacking is completed, the same electrode sheets are overlapped to form an injection molding area 18. The injection molding area 18 is placed in a corresponding mold, and the hot melt sealant liquid is injected. After the sealant liquid is cooled, it is pressurized and shaped so that the pole ear has a flat sealing area.

[0100] In order to avoid the phenomenon that the packaging film 15 is corroded by electricity, as a specific implementation method, Figure 19-21 As shown, the sealant corresponding to the positive electrode conductive structure is a conductive glue, and the plastic area 19 composed of the conductive glue has a groove for inserting the packaging film 15, and the groove wall is provided with a boss 20 for conductive contact with the metal part of the packaging film 15, so as to reduce the potential difference between the positive electrode tab 3 and the packaging film 15, so that the soft-pack battery has the function of anti-corrosion of the packaging film.

[0101] Specifically, after injection molding, the plastic area 19 of the positive electrode conductive structure has a boss 20. Since the sealant is a conductive glue, the positive electrode tab 3 is electrically connected to the boss 20. Since the packaging film 15 is electrically connected to the boss 20, the positive electrode tab 3 is electrically connected to the packaging film 15, and there is a certain resistance value between the positive electrode tab 3 and the packaging film 15 (specifically, the resistance value of the conductive glue between the positive electrode tab 3 and the packaging film 15). Therefore, there is a certain resistance value between the positive electrode tab 3 and the packaging film 15, which can reduce the potential difference between the positive electrode tab 3 and the packaging film 15 and prevent the packaging film 15 from being corroded by electricity.

[0102] Of course, in other specific embodiments, the conductive glue can also be directly bonded to the packaging film 15 to achieve electrical connection between the conductive glue and the packaging film 15; the sealant can also be a non-conductive glue. In this case, other methods can be used to reduce the potential difference between the packaging film 15 and the positive electrode tab 3; or, the potential difference between the packaging film 15 and the positive electrode tab 3 is not reduced, which does not affect the normal use of the soft-pack battery, but does not have the anti-corrosion function of the packaging film.

[0103] Specific embodiment 5 of the soft-pack battery provided by the present invention:

[0104] The purpose of this embodiment is to provide a different soft-pack battery, in which the same-pole tabs are once injection-molded by a sealant to seal and connect the same-pole tabs and form a corresponding conductive structure. The main difference between this embodiment and specific embodiment 4 is that after injection molding, the plastic area 19 of the positive electrode conductive structure only includes the boss 20, and does not include a groove for inserting the packaging film 15.

[0105] like Figure 22-24 As shown, the sealant corresponding to the positive electrode conductive structure is a conductive glue. In the arrangement direction of the positive electrode tab 3, the plastic area 19 composed of the conductive glue is provided with bosses 20 on both sides away from the positive electrode tab 3 for conductive contact with the metal part of the packaging film 15, so as to reduce the potential difference between the positive electrode tab 3 and the packaging film 15.

[0106] In this embodiment, after injection molding, a boss 20 is provided on the plastic area 19 of the positive electrode conductive structure. Since the sealant is a conductive glue, the positive electrode tab 3 is electrically connected to the boss 20. Since the packaging film 15 is electrically connected to the boss 20, the positive electrode tab 3 is electrically connected to the packaging film 15, and there is a certain resistance value between the positive electrode tab 3 and the packaging film 15 (specifically, the resistance value of the conductive glue between the positive electrode tab 3 and the packaging film 15). Therefore, there is a certain resistance value between the positive electrode tab 3 and the packaging film 15, which can reduce the potential difference between the positive electrode tab 3 and the packaging film 15 and prevent the packaging film 15 from being corroded by electricity.

[0107] Compared with specific embodiment 4, the structure of the soft-pack battery in this embodiment is simpler. At the same time, since the plastic area 19 is made of conductive glue, when the packaging film 15 and the battery cell are packaged together, on the basis of the electrical connection between the packaging film 15 and the boss 20, the conductive glue can be bonded to the packaging film 15 to ensure the connection strength between the packaging film 15 and the boss.

[0108] Specific embodiments of the battery provided by the present invention:

[0109] The purpose of this embodiment is to provide a battery cell, which eliminates the positive electrode connecting plate and the negative electrode connecting plate by directly using the electrode ear as a conductive structure, and does not need to be welded. Therefore, after the battery cell is applied to a soft-pack battery, the volume energy density, power performance and reliability of the soft-pack battery can be improved, the quality of the soft-pack battery can be ensured and safety hazards can be eliminated.

[0110] The specific structure of the battery cell 13 in this embodiment is the same as the specific structure of the battery cell 13 in any one of the specific embodiments 1-5 of the soft-pack battery in the present invention, and will not be repeated here.

[0111] Specific embodiments of the electrical equipment provided by the present invention:

[0112] The purpose of this embodiment is to provide an electrical device using a soft-pack battery. The soft-pack battery is any one of the soft-pack battery specific embodiments 1-5 of the present invention, which will not be described in detail here.

[0113] Specific embodiments of the method for preparing the soft-pack battery provided by the present invention:

[0114] The purpose of this embodiment is to provide a method for preparing a soft-pack battery, by directly using the pole ear as a conductive structure, thereby eliminating the positive electrode connecting sheet (i.e., Tab connecting sheet) and the negative electrode connecting sheet (i.e., Tab connecting sheet), and no welding is required, thereby improving the volume energy density, power performance and reliability of the soft-pack battery, ensuring the quality of the soft-pack battery and eliminating safety hazards.

[0115] Reference Figure 2 and Figure 4-24 As a specific embodiment, the preparation method of the soft-pack battery includes a punching step and a packaging film packaging step of sealingly connecting the conductive structure of the battery cell 13 with the packaging film 15; the number of the positive electrode tabs 3 is two, and the number of the negative electrode tabs 4 is two. Between the punching step and the packaging film packaging step, there is also a winding step or a stacking step of gathering all the same-pole tabs together, and between the winding step or the stacking step and the packaging film packaging step, there is also a sealing step. In the sealing step, all the same-pole tabs are sealed and connected to form a corresponding conductive structure; in the punching step, the accommodating pit 14 is made close to the sealing area.

[0116] However, in other specific embodiments, the number of positive electrode tabs 3 may also be one, and a single positive electrode tab 3 constitutes a positive electrode conductive structure. Of course, in different specific embodiments, the number of positive electrode tabs 3 may also be three, four or other numbers. When the number of positive electrode tabs 3 is not less than two, all positive electrode tabs 3 are sealed and connected to form a positive electrode conductive structure. Similarly, the number of negative electrode tabs 4 may also be one, and a single negative electrode tab 4 constitutes a negative electrode conductive structure. Of course, in different specific embodiments, the number of negative electrode tabs 4 may also be three, four or other numbers. When the number of negative electrode tabs 4 is not less than two, all negative electrode tabs 4 are sealed and connected to form a negative electrode conductive structure. In this embodiment, the number of positive electrode tabs 3 and negative electrode tabs 4 is not limited, and the size relationship between the number of positive electrode tabs 3 and the number of negative electrode tabs 4 is not limited.

[0117] Specifically, in the packaging film packaging step, a hot melt adhesive layer 6 is arranged outside the conductive structure of the battery cell 13, and the battery cell 13 is sealed and connected to the packaging film 15 through the hot melt adhesive layer 6; however, in other specific embodiments, a corresponding hot melt adhesive layer may also be arranged on the packaging film 15, and the battery cell 13 is sealed and connected to the packaging film 15 through the hot melt adhesive layer.

[0118] In this embodiment, the lamination step and the winding step are both prior art and will not be described in detail here. In the punching step, except that the welding reserved area 51 is not processed (the rectangular box in the figure is only for illustration, and in fact the area is a reserved blank area) and the relative position of the receiving pit 14 and the sealing area is changed so that the receiving pit 14 is close to the sealing area, the rest are prior art and will not be described in detail here. In the packaging film packaging step, except that the packaging film 15 is hot-melt-sealed with the positive and negative electrode tabs instead of hot-melt-sealed with the positive and negative electrode connecting sheets, the rest are prior art and will not be described in detail here.

[0119] As a specific implementation method, Figure 2 and 4 As shown, the conductive structures all extend from the top of the soft-pack battery, so the sealing area is the top sealing area 7, and the receiving pit 14 is close to the top sealing area 7; however, in other specific embodiments, the conductive structure may also extend from the side of the soft-pack battery, in which case the sealing area is the side sealing area, and the receiving pit 14 is close to the side sealing area; of course, the positive electrode conductive structure may also extend from the top of the soft-pack battery, and the negative electrode conductive structure may also extend from the bottom of the soft-pack battery, in which case the sealing areas are the top sealing area 7 and the bottom sealing area, and the positive electrode conductive structure is close to the top sealing area 7, and the negative electrode conductive structure is close to the bottom sealing area. In this embodiment, the specific structure of the sealing area is not limited.

[0120] Among them, the punching step is to process the packaging film 15, and the sealing step, the winding step and the stacking step are to process the battery cell 13, so there is no relevant order between the punching step and the sealing step, the winding step and the stacking step.

[0121] Through the punching step, the accommodating pit 14 for accommodating the battery cell 13 can be made close to the sealing area, and there is no need to set a welding reserved area 51 between the accommodating pit 14 and the sealing area, thereby improving the volume energy density of the soft-pack battery; through the stacking or winding step, the same-pole plates can be aggregated together; after the stacking or winding step, the sealing step is performed, the same-pole tabs can be sealed and connected to form a corresponding conductive structure, eliminating the positive electrode connecting plate 1 and the negative electrode connecting plate 2, thereby eliminating the welding area 5 on the tab, which is beneficial to improving the volume energy density of the soft-pack battery and the battery cell 13. At the same time, the same-pole tabs are sealed and connected by hot melting, and no welding is required, so that no metal welding slag foreign matter that can enter the battery cell 13 will be generated, thereby ensuring the quality of the soft-pack battery and eliminating safety hazards.

[0122] Specifically, the following methods can be used to seal the same-pole tabs:

[0123] The first method: In the sealing step, all the same-polarity tabs are heated and pressurized to seal and connect adjacent same-polarity tabs to form a corresponding conductive structure.

[0124] The first method is divided into two sub-methods:

[0125] The first sub-method: a hot melt adhesive is provided on the pole ear, and the pole ear and the hot melt adhesive are melted and squeezed into a whole to form a conductive structure. Specifically, when the pole piece is processed through the lamination step, the soft-pack battery produced is the soft-pack battery in the specific embodiment 1 of the soft-pack battery of the present invention; when the pole piece is processed through the winding step, the soft-pack battery produced is the soft-pack battery in the specific embodiment 3 of the soft-pack battery of the present invention when the specific embodiment 1 is cited.

[0126] Second sub-method: The same-pole tabs are sealed and connected by metal hot melting to form a conductive structure. Specifically, when the pole piece is processed by the lamination step, the soft-pack battery produced is the soft-pack battery in the specific embodiment 2 of the soft-pack battery of the present invention; when the pole piece is processed by the winding step, the soft-pack battery produced is the soft-pack battery in the specific embodiment 3 of the soft-pack battery of the present invention when the specific embodiment 2 is cited.

[0127] The second method: in the sealing step, the same-pole tabs are injection molded into one piece through a mold and a sealant to form a corresponding conductive structure. Specifically, the soft-pack battery manufactured by this specific implementation is the soft-pack battery in the specific embodiment 4 of the soft-pack battery in the present invention.

[0128] The third method: In order to avoid the phenomenon of electrical corrosion of the packaging film 15, the sealant corresponding to the positive electrode conductive structure is a conductive glue, and a groove for inserting the packaging film 15 is formed on the plastic area 19 composed of the conductive glue during the injection molding process, and a boss 20 for conductive contact with the metal part of the packaging film 15 is formed in the groove. In the packaging film packaging step, the metal part of the packaging film 15 is conductively contacted with the boss 20 to reduce the potential difference between the positive electrode tab 3 and the packaging film 15, thereby avoiding electrical corrosion of the packaging film 15. Specifically, the soft-pack battery produced by this specific embodiment is a soft-pack battery with a boss 20 and a groove in the specific embodiment 4 of the soft-pack battery in the present invention.

[0129] The fourth method: the sealant corresponding to the positive electrode conductive structure is a conductive glue, and in the arrangement direction of the positive electrode tab 3, the plastic area 19 formed by the conductive glue is formed on both sides away from the positive electrode tab 3 during the injection molding process to form a boss 20 for conductive contact with the metal part of the packaging film 15, and in the packaging film packaging step, the metal part of the packaging film 15 is conductively contacted with the boss 20 to reduce the potential difference between the positive electrode tab 3 and the packaging film 15. Specifically, the soft-pack battery manufactured by this specific embodiment is a soft-pack battery with a boss 20 in the specific embodiment 5 of the soft-pack battery in the present invention.

[0130] After the packaging film 15 and the battery cell 13 are made into a dry battery cell, the electrolyte is injected, and the finished battery is made through processes such as formation and capacity separation.

[0131] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery cell, comprising a positive electrode tab and a negative electrode tab, characterized in that: There are at least two positive electrode tabs, and an injection molding area is provided on the positive electrode tab. The positive electrode tab is injection molded at one time with a conductive glue to seal the positive electrode tabs and form a positive electrode conductive structure. The plastic area formed by the conductive glue has a groove for inserting a packaging film, and a boss is provided on the groove wall of the groove for conductive contact with the metal part of the packaging film to reduce the potential difference between the positive electrode tab and the packaging film; when there is one negative electrode tab, a single negative electrode tab constitutes the negative electrode conductive structure, and when there are at least two negative electrode tabs, an injection molding area is provided on the negative electrode tab, and the negative electrode tab is injection molded at one time with a sealant to seal the negative electrode tabs and form a negative electrode conductive structure.

2. The battery cell according to claim 1, characterized in that: Both the positive electrode conductive structure and the negative electrode conductive structure are provided with a hot melt adhesive layer for sealingly connecting with the packaging film. The hot melt adhesive layer includes a packaging area for cooperating with the packaging film to form a packaging film seal. The extension direction of the conductive structure is defined as the longitudinal direction. Both lateral ends of the hot melt adhesive layer protrude from the corresponding conductive structure, and both longitudinal ends of the hot melt adhesive layer protrude from the packaging area.

3. A battery cell, comprising a positive electrode tab and a negative electrode tab, characterized in that: There are at least two positive electrode tabs, and an injection molding area is provided on the positive electrode tab. The positive electrode tab is injection molded at one time with a conductive glue to seal the positive electrode tabs and form a positive electrode conductive structure. In the arrangement direction of the positive electrode tabs, the plastic area formed by the conductive glue is provided with bosses on both sides away from the positive electrode tabs for conductive contact with the metal part of the packaging film, so as to reduce the potential difference between the positive electrode tab and the packaging film; when there is one negative electrode tab, a single negative electrode tab constitutes the negative electrode conductive structure, and when there are at least two negative electrode tabs, an injection molding area is provided on the negative electrode tab, and the negative electrode tab is injection molded at one time with a sealant to seal the negative electrode tabs and form a negative electrode conductive structure.

4. The battery cell according to claim 3, characterized in that: Both the positive electrode conductive structure and the negative electrode conductive structure are provided with a hot melt adhesive layer for sealingly connecting with the packaging film. The hot melt adhesive layer includes a packaging area for cooperating with the packaging film to form a packaging film seal. The extension direction of the conductive structure is defined as the longitudinal direction. Both lateral ends of the hot melt adhesive layer protrude from the corresponding conductive structure, and both longitudinal ends of the hot melt adhesive layer protrude from the packaging area.

5. A soft pack battery, comprising a packaging film and a battery cell, wherein the packaging film is provided with a receiving pit and a sealing area, and the battery cell is installed in the receiving pit, characterized in that: The battery cell is the battery cell described in any one of claims 1 to 4, the conductive structure is sealed and connected to the sealing area, and the receiving pit is close to the sealing area.

6. An electrical equipment, characterized in that: Comprising the soft-pack battery as described in claim 5.

7. A method for preparing a soft-pack battery, comprising a punching step, characterized in that: The invention also includes a packaging film packaging step of sealingly connecting the conductive structure of the battery cell with the packaging film; the number of positive pole ears is at least two, and a sheet rolling step or a sheet stacking step of aggregating all the same-pole ears together is provided between the punching step and the packaging film packaging step, and a sealing step is provided between the sheet rolling step or the sheet stacking step and the packaging film packaging step. In the sealing step, all the same-pole ears are sealed and connected to form a corresponding conductive structure; in the punching step, the accommodating pit is made to be close to the sealing area; in the sealing step, all the same-pole ears are heated and pressurized, and the same-pole ears are injection-molded into one piece through a mold and a sealant so that adjacent same-pole ears are close to each other. The ears are sealed and connected to form a corresponding conductive structure, the sealant corresponding to the positive conductive structure is a conductive glue, and during the injection molding process, a groove for inserting a packaging film is formed on the plastic area composed of the conductive glue, and a boss for conductive contact with the metal part of the packaging film is formed in the groove, and in the packaging film packaging step, the metal part of the packaging film is conductively contacted with the boss to reduce the potential difference between the positive electrode ear and the packaging film; when the number of negative electrode ears is one, the negative electrode ear directly constitutes the negative conductive structure, and when the number of negative electrode ears is at least two, all negative electrode ears form the negative conductive structure through the sealing step.

8. A method for preparing a soft pack battery, comprising a punching step, characterized in that: The invention also includes a packaging film packaging step of sealingly connecting the conductive structure of the battery cell with the packaging film; the number of positive pole ears is at least two, and a winding step or a stacking step of aggregating all the same-pole ears together is provided between the punching step and the packaging film packaging step, and a sealing step is provided between the winding step or the stacking step and the packaging film packaging step. In the sealing step, all the same-pole ears are sealed and connected to form a corresponding conductive structure; in the punching step, the accommodating pit is made to be close to the sealing area; in the sealing step, all the same-pole ears are heated and pressurized, and the same-pole ears are injection-molded into one piece through a mold and a sealant so that adjacent same-pole ears are connected. The positive electrode conductive structure is formed by sealing and connecting the positive electrode tabs with each other to form a corresponding conductive structure. The sealant corresponding to the positive electrode conductive structure is a conductive glue. In the arrangement direction of the positive electrode tabs, the plastic area formed by the conductive glue is away from the two sides of the positive electrode tabs during the injection molding process to form bosses for conductive contact with the metal part of the packaging film. In the packaging film packaging step, the metal part of the packaging film is conductively contacted with the bosses to reduce the potential difference between the positive electrode tabs and the packaging film. When the number of negative electrode tabs is one, the negative electrode tabs directly constitute the negative electrode conductive structure. When the number of negative electrode tabs is at least two, all negative electrode tabs form the negative electrode conductive structure through the sealing step.

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