Soft package battery

Abstract

The utility model provides a soft package battery which comprises a packaging film, the wall surface of one side of the packaging film is an insulating surface, and the insulating surface comprises a first area surface and a second area surface; the first battery cell is arranged on the first area surface, and the first battery cell comprises a first body, a first positive tab, a second positive tab and a first negative tab; the second battery cell is arranged on the first area surface, and the second battery cell comprises a second body, a third positive electrode lug, a second negative electrode lug and a third negative electrode lug; the second area surface covers the first area surface, and the first battery cell and the second battery cell are sealed between the first area surface and the second area surface; the second positive tab is connected with the third positive tab, the first negative tab is connected with the second negative tab, the first positive tab is exposed out of the packaging film and forms a positive electrode of the soft package battery, and the third negative tab is exposed out of the packaging film and forms a negative electrode of the soft package battery. And the thickness of the soft package battery can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to a soft-pack battery. Background Art

[0002] In modern soft-pack battery technology, the design of wound cells often faces a series of challenges. Especially in the pursuit of large cell capacity, it is usually necessary to increase the number of winding layers, which directly leads to a significant increase in the thickness of the cell. This increase in thickness not only increases the overall size of the soft-pack battery, but may also cause a series of potential problems, the most prominent of which is the risk of lithium deposition at the corners. Corner lithium deposition refers to the precipitation of lithium metal at the corners during the charge and discharge process of the soft-pack battery to form lithium dendrites, which may pierce the diaphragm and cause the soft-pack battery to short-circuit, seriously affecting the safety and service life of the soft-pack battery.

[0003] In response to some customers' special requirements for battery cell length, they may not have specific restrictions on the length and width of small batteries, but have strict control over the thickness of batteries. This demand is particularly common in electronic products that pursue high energy density and thin and light designs. However, when customers have a large demand for battery cell capacity, it becomes particularly difficult to achieve the design of high-capacity batteries while meeting the thickness restrictions.

[0004] In order to solve this problem, this solution proposes a new soft-pack battery. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a soft-pack battery, which can reduce the thickness of the soft-pack battery and effectively reduce the problem of lithium deposition at the corner of the battery cell.

[0006] A soft-pack battery according to an embodiment of the first aspect of the utility model comprises: a packaging film having a first cavity and a second cavity, wherein the first cavity and the second cavity are arranged along the length direction of the packaging film; a first battery cell is arranged in the first cavity, wherein the first battery cell comprises a first body, a first positive electrode ear, a second positive electrode ear and a first negative electrode ear, wherein the first positive electrode ear, the second positive electrode ear and the first negative electrode ear are all arranged on the first body; a second battery cell is arranged in the second cavity, wherein the second battery cell comprises a second body, a third positive electrode ear, a second negative electrode ear and a third negative electrode ear, wherein the third positive electrode ear, the second negative electrode ear and the third negative electrode ear are all arranged on the second body; the second positive electrode ear and the third positive electrode ear are connected, the first negative electrode ear and the second negative electrode ear are connected, the first positive electrode ear is exposed outside the packaging film, and the third negative electrode ear is exposed outside the packaging film.

[0007] According to a soft-pack battery of the first embodiment of the utility model, there are at least the following beneficial effects: by arranging a plurality of battery cells and wrapping and sealing the battery cells with a packaging film, the plurality of battery cells are connected in parallel, and the energy of the soft-pack battery is increased by increasing the number of battery cells without increasing the thickness of the soft-pack battery, that is, by increasing the width or length of the soft-pack battery, the problem of lithium deposition at the corner caused by excessive thickness of the battery cell is avoided.

[0008] According to some embodiments of the present invention, the first positive electrode ear protrudes out of the first cavity along the width direction of the packaging film, the third negative electrode ear protrudes out of the second cavity along the width direction of the packaging film, and the first positive electrode ear and the third negative electrode ear are located on the same side of the packaging film.

[0009] According to some embodiments of the present invention, the length of the first positive electrode ear is greater than the length of the second positive electrode ear, the first negative electrode ear, the third positive electrode ear and the second negative electrode ear, and the length of the third negative electrode ear is greater than the length of the second positive electrode ear, the first negative electrode ear, the third positive electrode ear and the second negative electrode ear.

[0010] According to some embodiments of the present invention, the first positive electrode ear and the third negative electrode ear are exposed outside the packaging film along the width direction of the packaging film, the first positive electrode ear is located on one side of the packaging film, and the third negative electrode ear is located on the side of the packaging film facing away from the first positive electrode ear.

[0011] According to some embodiments of the present invention, the first cavity and the second cavity are sealed chambers isolated from each other.

[0012] According to some embodiments of the present invention, the thickness of the first battery cell and the second battery cell does not exceed 40 mm.

[0013] According to some embodiments of the present invention, the second positive electrode ear and the first negative electrode ear are both arranged on a side of the first battery cell close to the second battery cell, and the third positive electrode ear and the second negative electrode ear are both arranged on a side of the second battery cell close to the first battery cell.

[0014] According to some embodiments of the utility model, the packaging film also has a third cavity, the soft-pack battery also includes a third battery cell, the third battery cell includes a third body, a fourth positive electrode ear, a fifth positive electrode ear, a fourth negative electrode ear and a fifth negative electrode ear, the third body is arranged in the third cavity, the fourth positive electrode ear, the fifth positive electrode ear, the fourth negative electrode ear and the fifth negative electrode ear are all arranged on the third body, the second positive electrode ear is connected to the fourth positive electrode ear, the third positive electrode ear is connected to the fifth positive electrode ear, the first negative electrode ear is connected to the fourth negative electrode ear, and the second negative electrode ear is connected to the fifth negative electrode ear.

[0015] According to some embodiments of the utility model, the first battery cell, the third battery cell and the second battery cell are arranged in sequence along the length direction of the packaging film, the second positive electrode ear and the first negative electrode ear are arranged on a side of the first battery cell close to the third battery cell, the fourth positive electrode ear and the fourth negative electrode ear are arranged on a side of the third battery cell close to the first battery cell, the fifth positive electrode ear and the fifth negative electrode ear are arranged on a side of the third battery cell close to the second battery cell, and the third positive electrode ear and the second negative electrode ear are arranged on a side of the first battery cell close to the third battery cell.

[0016] According to some embodiments of the present invention, the first battery cell further includes a sixth negative electrode ear, which is connected to the first body and exposed outside the packaging film; and / or the second battery cell further includes a sixth positive electrode ear, which is connected to the second body and exposed outside the packaging film.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the packaging film of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the utility model with two battery cells;

[0020] Figure 3 This is a schematic diagram of the structure of the utility model with three battery cells;

[0021] Figure 4 A schematic diagram of the structure of the utility model with a positive electrode and a negative electrode;

[0022] Figure 5 The utility model is provided with two positive electrodes and two negative electrodes.

[0023] Figure Number:

[0024] 1. Packaging film; 11. First area surface; 12. Second area surface; 13. First groove; 14. Second groove; 15. Airbag groove; 16. First cavity; 17. Second cavity; 2. First battery cell; 21. First body; 22. First positive ear; 23. Second positive ear; 24. First negative ear; 25. Sixth negative ear; 3. Second battery cell; 31. Second body; 32. Third positive ear; 33. Second negative ear; 34. Third negative ear; 35. Sixth positive ear; 4. Third battery cell; 41. Third body; 42. Fourth positive ear; 43. Fifth positive ear; 44. Fourth negative ear; 45. Fifth negative ear. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] In the prior art, a cell that is too thick may bring many disadvantages, such as increased internal resistance, decreased charge and discharge performance, and safety issues. A cell that is too thick may increase the resistance encountered by ions when moving between the positive and negative electrodes, thereby increasing the internal resistance of the soft-pack battery. This reduces the charge and discharge efficiency of the soft-pack battery, resulting in a decrease in the performance of the soft-pack battery. A cell that is too thick may result in a decrease in the charge and discharge performance of the soft-pack battery. During the charging process, thicker cells take longer to be fully charged; during the discharge process, thicker cells may not be able to provide enough current to meet the needs of the device. A cell that is too thick may increase the safety risk of the soft-pack battery. During the use of the soft-pack battery, if the cell is too thick, it may cause excessive heat accumulation inside the soft-pack battery, causing safety issues such as thermal runaway. In addition, thicker cells may also be more susceptible to damage when the soft-pack battery is impacted by external forces, further increasing safety risks. In summary, a cell that is too thick may have a negative impact on the performance, safety, and cost of the soft-pack battery.

[0030] Reference Figure 1 , Figure 2 and Figure 4A soft-pack battery in the first embodiment of the utility model includes: a packaging film 1, a first battery cell 2 and a second battery cell 3, the wall surface on one side of the packaging film 1 is an insulating surface, and the insulating surface includes a first regional surface 11 and a second regional surface 12; wherein the first regional surface 11 and the second regional surface 12 are both made of insulating materials, and the first regional surface 11 and the second regional surface 12 wrap the first battery cell 2 and the second battery cell 3 to ensure that the first battery cell 2 and the second battery cell 3 are isolated from the outside. The first battery cell 2 is arranged on the first regional surface 11, and the first battery cell 2 includes a first body 21, a first positive electrode ear 22, a second positive electrode ear 23 and a first negative electrode ear 24, and the first positive electrode ear 22, the second positive electrode ear 23 and the first negative electrode ear 24 are all arranged on the first body 21; the second battery cell 3 is arranged on the first regional surface 11, and the second battery cell 3 includes a second body 31, a third positive electrode ear 32, a second negative electrode ear 33 and a third negative electrode ear 34, and the second body 31, the third positive electrode ear 32, the second negative electrode ear 33 and the third negative electrode ear 34 are all arranged on the second body 31; the first battery cell 2 and the second battery cell 3 are connected in parallel to form a whole, and are flatly laid in the first regional surface 11, so that when multiple battery cells are used to increase the capacity of the soft-pack battery, the thickness of the soft-pack battery is not increased. The second area surface 12 covers the first area surface 11, and seals the first battery cell 2 and the second battery cell 3 between the first area surface 11 and the second area surface 12; the second positive electrode ear 23 is connected to the third positive electrode ear 32, the first negative electrode ear 24 is connected to the second negative electrode ear 33, the first positive electrode ear 22 is exposed outside the packaging film 1 and forms the positive electrode of the soft-pack battery, and the third negative electrode ear 34 is exposed outside the packaging film 1 and forms the negative electrode of the soft-pack battery. The packaging film 1 can be used in one piece or in two pieces. When using a whole piece, the packaging film 1 is divided into two area surfaces, namely the first area surface 11 and the second area surface 12. After the battery cell is placed on the first area surface 11, the second area surface 12 is folded up and covered on the first area surface 11, so as to seal the battery cell. When two packaging films 1 are used, one of the packaging films 1 is laid as the first area surface 11 at the bottom, and the battery cell is set on the first area surface 11, and then the other packaging film 1 is covered on the first area surface 11 as the second area surface 12, so as to seal the battery cell. The first area surface 11 and the second area surface 12 have insulating properties, so the first area surface 11 and the second area surface 12 can contact the tabs on the first battery cell 2 and the second battery cell 3, so the tabs can be squeezed by the packaging film 1 to fix each tab, and while the first positive tab 22 and the third negative tab 34 are exposed outside the packaging film 1, the sealing of the environment where the first body 21 and the second body 31 are located is ensured.

[0031] Furthermore, the positive electrode ears of the battery can be arranged on the same side of the packaging film 1, or on the two sides of the packaging film 1 facing away from each other. The positive electrode of the battery and the negative electrode of the battery can be arranged on the same battery cell, or on different battery cells, and the battery can be provided with multiple positive electrodes and multiple negative electrodes. Figure 5 For example, a sixth positive electrode ear 35 and / or a sixth negative electrode ear 25 are provided. The sixth negative electrode ear 25 is connected to the first body 21, the sixth negative electrode ear 25 is exposed outside the packaging film 1, and forms the negative electrode of the battery. The sixth positive electrode ear 35 is connected to the second body 31, the sixth positive electrode ear 35 is exposed outside the packaging film 1, and forms the positive electrode of the battery. Thus, the positive electrode and the negative electrode of the battery are provided on the first battery cell 2, and the positive electrode and the negative electrode of the battery are also provided on the second battery cell 3, so that the battery can be more conveniently connected with other electronic components when charging and discharging.

[0032] Furthermore, the length of the first positive electrode ear 22 is greater than the length of the second positive electrode ear 23, the first negative electrode ear 24, the third positive electrode ear 32 and the second negative electrode ear 33, and the length of the third negative electrode ear 34 is greater than the length of the second positive electrode ear 23, the first negative electrode ear 24, the third positive electrode ear 32 and the second negative electrode ear 33. The first positive electrode ear 22 and the third negative electrode ear 34 need to be exposed outside the packaging film 1 and form the positive electrode or negative electrode of the battery, so they need to be set to a longer length to facilitate the connection of the battery and other electronic components, while the other electrodes can be set to a shorter length to save the space occupied by the battery.

[0033] Furthermore, the packaging film 1 includes an aluminum-plastic film, and one side of the aluminum-plastic film on which the nylon layer is provided is an insulating surface. The aluminum-plastic film is a material formed by compounding multiple layers of materials through an adhesive, and is mainly used for the outer packaging of soft-pack lithium-ion soft-pack batteries. Its structure and performance characteristics make it play a vital role in the manufacture of soft-pack batteries. The main structure of the aluminum-plastic film includes a nylon layer (ON layer) and an aluminum foil layer (AL layer). The nylon layer mainly plays a role in protecting the interior, preventing the aluminum foil layer from being scratched, and has the characteristics of impact resistance, puncture resistance, heat resistance, insulation and friction resistance. The aluminum foil layer uses an oxide film generated by the reaction of aluminum with oxygen in the air to prevent water and gas from penetrating. The main performance characteristics of the aluminum-plastic film include extremely high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, high temperature resistance, insulation, etc. These characteristics enable the aluminum-plastic film to effectively protect the internal battery cells during the manufacture of soft-pack batteries, and prevent external factors such as moisture, gas and electrolyte from damaging the soft-pack batteries. Aluminum-plastic film plays an important role in sealing and protecting the battery cell in the manufacture of soft-pack lithium-ion soft-pack batteries. Its special structure and performance characteristics enable soft-pack batteries to work stably in various environments, while also improving the safety and reliability of soft-pack batteries.

[0034] Reference Figure 2 and Figure 4 , a first groove 13 and a second groove 14 are arranged in the first area surface 11, a first body 21 is arranged in the first groove 13, and a second body 31 is arranged in the second groove 14, wherein after the second area surface 12 covers the first body 21 and the second body 31, the first groove 13 forms a first cavity 16, and the second groove 14 forms a second cavity 17. The battery cells are arranged in the grooves respectively, and the battery cells are positioned by the grooves on the aluminum-plastic film, so that the battery cells can be arranged on the packaging film 1 more accurately, firmly and stably. Among them, since the aluminum-plastic film has a certain ductility, the first groove 13 and the second groove 14 can be formed by a stamping process. The stamping of the aluminum-plastic film is a process of processing the aluminum-plastic film into the required shape on the mold, which specifically includes the following steps: firstly, the aluminum-plastic film material is placed on a punching machine, and the required mold is installed on the punching machine. Among them, the size of the mold is consistent with the size of the battery cell, or the mold is slightly larger than the size of the battery cell, so that when the battery cell is placed in the groove, it can be placed more tightly in the groove. Then, the punching machine is used to press down the mold to punch the aluminum-plastic film material into the required shape. Thus, the first groove 13 and the second groove 14 are formed.

[0035] According to some embodiments of the utility model, the second area surface 12 covers the first area surface 11, and the first body 21 is sealed in the first groove 13, the second body 31 is sealed in the second groove 14, and the first groove 13 and the second groove 14 are isolated from each other. In order to avoid mutual influence between multiple battery cells, multiple battery cells are respectively arranged in multiple independent grooves and sealed independently. Thereby, the safety of the soft-pack battery is greatly enhanced, that is, when one battery cell in the soft-pack battery fails, it will not affect the operation of other battery cells. For example, when the electrolyte of one of the battery cells is exposed, the electrolyte will be sealed in the groove where it is located, and will not leak into other grooves to affect other battery cells. Therefore, the safety and stability of the soft-pack battery are greatly enhanced.

[0036] Furthermore, the depth of the first groove 13 and the second groove 14 does not exceed 20 mm, and the thickness of the battery cell does not exceed 40 mm. The ductility of the aluminum-plastic film is limited, so it cannot be deformed too much. The first groove 13 and the second groove 14 are formed by stamping. If the depth of the first groove 13 and the second groove 14 is too large, it will break the limit of the deformation of the aluminum-plastic film, causing the aluminum-plastic film to be damaged. Therefore, the depth of the first groove 13 and the second groove 14 is limited to within 20 mm. The first battery cell 2 and the second battery cell 3 only need half of their thickness to be placed in the groove on the first area surface 11, and the other half of their thickness can be accommodated and wrapped by the second area surface 12 and sealed.

[0037] Reference Figure 1, a number of airbag grooves 15 are also provided in the first area surface 11, and the second area surface 12 covers the first area surface 11, and the airbag groove 15 forms a cavity. First of all, sealing is very important for soft-pack batteries, because the chemical reaction inside the soft-pack battery will produce gas. If the sealing is not tight, the gas may leak out, resulting in a decrease in the performance of the soft-pack battery or a safety hazard. Therefore, in the manufacturing process of the soft-pack battery, it is necessary to ensure the tightness of the aluminum-plastic film packaging. A certain space is left inside the soft-pack battery, that is, the cavity formed by the airbag groove 15, which is used to accommodate the gas generated during the charging and discharging process of the soft-pack battery. This space can ensure that the soft-pack battery will not expand or explode due to excessive internal pressure during the charging and discharging process. At the same time, when the soft-pack battery is packaged, when the first area surface 11 and the second area surface 12 of the packaging film 1 are sealed, there will be a part of the gas inside the packaging film 1 that cannot be discharged, which will cause the soft board soft-pack battery to bulge, and remain in the first groove 13 and the second groove 14, resulting in the packaging film 1 being unable to tightly fix the battery cell, causing the battery cell to shake in the groove. Therefore, the airbag groove 15 is used to form a cavity, so that the retained gas is contained in the cavity, so that the battery cell is fixed more firmly by the packaging film 1, and the safety of the soft-pack battery is improved.

[0038] Reference Figure 3 The soft-pack battery also includes a third battery cell 4, which includes a third body 41, a fourth positive electrode ear 42, a fifth positive electrode ear 43, a fourth negative electrode ear 44 and a fifth negative electrode ear 45. The fourth positive electrode ear 42, the fifth positive electrode ear 43, the fourth negative electrode ear 44 and the fifth negative electrode ear 45 are all arranged on the third body 41. The second positive electrode ear 23 is connected to the fourth positive electrode ear 42, the third positive electrode ear 32 is connected to the fifth positive electrode ear 43, the first negative electrode ear 24 is connected to the fourth negative electrode ear 44, and the second negative electrode ear 33 is connected to the fifth negative electrode ear 45. Multiple batteries can be arranged in the soft-pack battery, and multiple batteries are connected in parallel to form a soft-pack battery with a small thickness and a large capacity. Among them, only the first battery cell 2 and the second battery cell 3 are special, having three pole ears. The other cells are the same as the third cell 4, having four tabs, namely, two positive tabs and two negative tabs, one of which is connected to the positive tab of the previous cell, and the other is connected to the positive tab of the next cell. Of the two negative tabs, one is connected to the negative tab of the previous cell, and the other is connected to the negative tab of the next cell.

[0039] Reference Figure 3, the first battery cell 2, the third battery cell 4 and the second battery cell 3 are arranged in sequence along the length direction of the packaging film 1, the second positive electrode ear 23 and the first negative electrode ear 24 are arranged on the side of the first battery cell 2 close to the third battery cell 4, the fourth positive electrode ear 42 and the fourth negative electrode ear 44 are arranged on the side of the third battery cell 4 close to the first battery cell 2, the fifth positive electrode ear 43 and the fifth negative electrode ear 45 are arranged on the side of the third battery cell 4 close to the second battery cell 3, and the third positive electrode ear 32 and the second negative electrode ear 33 are arranged on the side of the first battery cell 2 close to the third battery cell 4. The first battery cell 2 and the second battery cell 3 are arranged at both ends. Specifically, the first battery cell 2 is arranged near the positive electrode ear of the soft-pack battery to form the positive electrode ear of the soft-pack battery, and the second battery cell 3 is arranged near the negative electrode ear of the soft-pack battery to form the negative electrode ear of the soft-pack battery. The third battery cell 4 is arranged between the first battery cell 2 and the second battery cell 3, so that the three batteries can be connected in parallel.

[0040] Furthermore, when the second area surface 12 is covered on the first area surface 11, the edges of the first area surface 11 and the second area surface 12 overlap. In order to ensure that the aluminum-plastic film is fully utilized, the edges can overlap the first area surface 11 and the second area surface 12 for sealing, so as to form the required sealing area with the least packaging film 1. Specifically, when a whole rectangular packaging film 1 is used, the first area surface 11 and the second area surface 12 are folded and formed at the middle line of the packaging film 1, wherein the middle line divides the plate-shaped film into two rectangles of completely identical shapes. Therefore, when the second area surface 12 is covered on the first area surface 11, the edges of the first area surface 11 and the second area surface 12 can be completely overlapped, thereby reducing the waste of the aluminum-plastic film.

[0041] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A soft pack battery, characterized in that: include: A packaging film, comprising a first cavity and a second cavity, wherein the first cavity and the second cavity are arranged along a length direction of the packaging film; A first battery cell is disposed in the first cavity, wherein the first battery cell comprises a first body, a first positive electrode tab, a second positive electrode tab and a first negative electrode tab, wherein the first positive electrode tab, the second positive electrode tab and the first negative electrode tab are all disposed on the first body; A second battery cell is disposed in the second cavity, wherein the second battery cell comprises a second body, a third positive electrode ear, a second negative electrode ear and a third negative electrode ear, wherein the third positive electrode ear, the second negative electrode ear and the third negative electrode ear are all disposed on the second body; The second positive electrode ear is connected to the third positive electrode ear, the first negative electrode ear is connected to the second negative electrode ear, the first positive electrode ear is exposed outside the packaging film, and the third negative electrode ear is exposed outside the packaging film.

2. A soft pack battery according to claim 1, characterized in that: The first positive electrode tab protrudes out of the first cavity along the width direction of the packaging film, the third negative electrode tab protrudes out of the second cavity along the width direction of the packaging film, and the first positive electrode tab and the third negative electrode tab are located on the same side of the packaging film.

3. A soft pack battery according to claim 1, characterized in that: The length of the first positive electrode ear is greater than the length of one of the second positive electrode ear, the first negative electrode ear, the third positive electrode ear and the second negative electrode ear, and the length of the third negative electrode ear is greater than the length of one of the second positive electrode ear, the first negative electrode ear, the third positive electrode ear and the second negative electrode ear.

4. The soft pack battery according to claim 1, characterized in that: The first positive electrode tab and the third negative electrode tab are exposed outside the packaging film along the width direction of the packaging film. The first positive electrode tab is located on one side of the packaging film, and the third negative electrode tab is located on the side of the packaging film facing away from the first positive electrode tab.

5. The soft pack battery according to claim 1, characterized in that: The first cavity and the second cavity are sealed chambers isolated from each other.

6. The soft pack battery according to claim 1, characterized in that: The thickness of the first battery cell and the second battery cell does not exceed 40 mm.

7. The soft pack battery according to claim 1, characterized in that: The second positive electrode tab and the first negative electrode tab are both arranged on a side of the first battery cell close to the second battery cell, and the third positive electrode tab and the second negative electrode tab are both arranged on a side of the second battery cell close to the first battery cell.

8. The soft pack battery according to claim 1, characterized in that: The packaging film also has a third cavity, the soft-pack battery also includes a third battery cell, the third battery cell includes a third body, a fourth positive electrode ear, a fifth positive electrode ear, a fourth negative electrode ear and a fifth negative electrode ear, the third body is arranged in the third cavity, the fourth positive electrode ear, the fifth positive electrode ear, the fourth negative electrode ear and the fifth negative electrode ear are all arranged on the third body, the second positive electrode ear is connected to the fourth positive electrode ear, the third positive electrode ear is connected to the fifth positive electrode ear, the first negative electrode ear is connected to the fourth negative electrode ear, and the second negative electrode ear is connected to the fifth negative electrode ear.

9. The soft pack battery according to claim 8, characterized in that: The first battery cell, the third battery cell and the second battery cell are arranged in sequence along the length direction of the packaging film, the second positive electrode ear and the first negative electrode ear are arranged on a side of the first battery cell close to the third battery cell, the fourth positive electrode ear and the fourth negative electrode ear are arranged on a side of the third battery cell close to the first battery cell, the fifth positive electrode ear and the fifth negative electrode ear are arranged on a side of the third battery cell close to the second battery cell, and the third positive electrode ear and the second negative electrode ear are arranged on a side of the first battery cell close to the third battery cell.

10. The soft pack battery according to claim 1, characterized in that: The first battery cell further includes a sixth negative electrode ear, the sixth negative electrode ear is connected to the first body, and the sixth negative electrode ear is exposed outside the packaging film; and / or; The second battery cell further includes a sixth positive electrode tab, which is connected to the second body and is exposed outside the packaging film.

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