Shelled battery

Abstract

The utility model relates to the technical field of soft package batteries, in particular to a shell-wrapped battery, which comprises a shell main body for accommodating a plurality of battery cells, the shell main body is made of an aluminum plastic film, the shell main body is arranged on the outer sides of the battery cells in a wrapping manner, and two ends of the shell main body are opened and are respectively provided with a first cover body and a second cover body; the first cover body and the second cover body are made of aluminum, stainless steel or a polymer molding material, pits are formed in the first cover body and the second cover body in a stamping mode, the pits are located in the shell main body, first sealing layers are arranged between the outer side walls of the pits and the inner side wall of the shell main body, protrusions are arranged on the pits located in the first cover body, and second sealing layers are arranged on the protrusions. The bulge is provided with a plurality of avoiding openings corresponding to the number of the battery cell tabs, and a second sealing layer is arranged between the inner side wall of the bulge and the battery cell tabs. The battery cell can be accommodated without depending on the punching pit depth of the aluminum plastic film, the structure is simple, the manufacturing is convenient, and the manufacturing cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of soft package battery, especially to a wrapped shell battery. BACKGROUND

[0002] The traditional soft package battery packaging structure is that one or more pit bodies of different length, width and depth are processed on the aluminum plastic film through a stamping die, the bare battery core of the battery body is put into the pit body, and the aluminum plastic film on the periphery of the battery body is packaged on both sides or even multiple sides through a heat packaging device, due to the limitation of the tensile ductility characteristics of the aluminum plastic film material, there is a limit pit depth, when the pit depth is close to or exceeds the limit pit depth, the aluminum plastic film after punching the pit will be cracked or even damaged, thereby causing sealing failure and irreversible influence on the battery performance, therefore, designing a wrapped shell battery structure which is not limited by the pit depth of the aluminum plastic film and the size of the battery is a technical problem that the enterprise R&D personnel need to solve urgently. SUMMARY

[0003] In view of the above problems in the prior art, the application provides a wrapped shell battery.

[0004] The above invention purpose of the application is realized by the following technical scheme:

[0005] A wrapped shell battery, comprising an outer shell body for accommodating a plurality of battery cores, the outer shell body is made of aluminum plastic film, the outer shell body is installed on the outer side of the battery core in a wrapping manner, the outer shell body is open at both ends and is respectively provided with a first cover body and a second cover body, the material of the first cover body and the second cover body is aluminum, stainless steel or high polymer forming material, the first cover body and the second cover body are provided with a recess in a stamping manner, the recess is located inside the outer shell body, a first sealing layer is arranged between the outer side wall of the recess and the inner side wall of the outer shell body, the recess of the first cover body is provided with a protrusion, a plurality of accommodation openings are arranged on the protrusion corresponding to the number of battery core tabs, and a second sealing layer is arranged between the inner side wall of the protrusion and the battery core tab.

[0006] By adopting the technical scheme, the shell body with two open ends is matched with the first cover body and the second cover body, and the first sealing layer is arranged between the concave pits of the first cover body and the second cover body and the shell body, so that a wrapping structure for accommodating the battery cell is formed. The structure can complete complete battery packaging without relying on the punching depth of the aluminum plastic film to accommodate the battery cell. The size of the wrapping structure can be flexibly adjusted according to the size of the battery cell or the number of battery cells, and the problem of damage of the aluminum plastic film caused by too deep punching can be eliminated. Meanwhile, the aluminum plastic film is used to wrap the battery cell, so that the shell body without punching can be formed, so as to ensure the consistency and stability of the aluminum plastic film structure at the battery cell main body. The protrusions and the accommodation openings are arranged on the concave pits of the first cover body, so that the battery cell tabs can be led out and the positions of the battery cell tabs can be adapted. The second sealing layer is arranged between the inner side wall of the protrusion and the battery cell tab, so that the sealing property at the battery cell tab can be ensured. Meanwhile, the first cover body and the second cover body are made of aluminum, stainless steel or high polymer forming material, so that the mechanical strength, processability and punching resistance of the first cover body and the second cover body are stronger, and the concave pits formed by punching have free size control and high punching precision.

[0007] In a preferred example, the concave pits of the first cover body and the second cover body are provided with protrusions.

[0008] By adopting the technical scheme, the protrusions are arranged on the concave pits of the first cover body and the second cover body. For the battery cell with tabs at both ends, corresponding accommodation openings can be provided, so that the battery cell tabs can be smoothly led out and be suitable for the working condition of the battery cell with tabs at both ends.

[0009] In a preferred example, the first sealing layer and the second sealing layer are formed by hot melting.

[0010] By adopting the technical scheme, the hot melting sealing has strong adaptability, good sealing effect and high sealing efficiency, and is suitable for the working condition of the soft package battery.

[0011] In a preferred example, the first sealing layer and the second sealing layer are annular.

[0012] By adopting the technical scheme, the first sealing layer and the second sealing layer are annular, so as to ensure complete sealing.

[0013] In a preferred example, the third sealing layer is arranged on the side sealing portion of the shell body by hot melting.

[0014] By adopting the technical scheme, the third sealing layer is formed by hot melting after the aluminum plastic film is wrapped, so as to complete hot melting packaging, improve the sealing effect of the shell body, and be suitable for the working condition of the soft package battery.

[0015] In a preferred example, the shell body, the first cover body, the second cover body, and the shell body itself are folded and fixed to each other.

[0016] By adopting the above technical solution, after the shell body and the first cover body, the shell body and the second cover body are sealed by the first sealing layer, and the shell body itself is sealed at the side sealing position by the third sealing layer, the shell body, the first cover body, the second cover body, and the shell body itself are folded and fixed to each other, which can further improve the sealing performance of the packaging structure, and at the same time, the size of the packaging structure can be reduced, that is, the overall size of the battery is reduced, thereby optimizing the space of the packaging structure.

[0017] In a preferred example, the application can be further configured as:

[0018] A wrapped battery includes a shell body for accommodating a plurality of battery cells, the shell body is made of an aluminum plastic film, the shell body is wrapped around the outside of the battery cells, the shell body is open at both ends and is respectively provided with a first cover body and a second cover body, the first cover body and the second cover body are made of aluminum, stainless steel or high polymer forming material, the first cover body is provided with a pole at a position corresponding to the tab of the battery cell, and the pole is used for electrically connecting to the tab of the battery cell.

[0019] By adopting the above technical solution, the structure can also complete the complete battery packaging, without relying on the punching depth of the aluminum plastic film to accommodate the battery cells, the size of the wrapped structure can be flexibly adjusted according to the size of the battery cells or the number of battery cells, and the problem of damage of the aluminum plastic film caused by too deep punching can be eliminated. Compared with the technical solution of opening a recess, a protrusion and a gap in the first cover body and the second cover body, the pole is directly electrically connected to the tab of the battery cell, which can also achieve the function of leading out the tab of the battery cell for use, and also plays a role in protecting the tab of the battery cell, and has higher safety.

[0020] In a preferred example, the application can be further configured as: the first cover body and the second cover body are provided with a pole at a position corresponding to the tab of the battery cell.

[0021] By adopting the above technical solution, for the battery cells with tabs at both ends, a corresponding positive pole or negative pole can be provided, so that the tab of the battery cell can be electrically connected smoothly, and the technical solution is suitable for the working condition of the battery cells with tabs at both ends.

[0022] In a preferred example, the application can be further configured as: the pole and the tab of the battery cell are electrically connected by internal welding.

[0023] By adopting the above technical solution, internal welding is adopted to ensure that the pole and the tab are in close contact, reduce the contact resistance, and improve the conductivity efficiency.

[0024] In a preferred example, the shell body is shaped like a blade or a square case.

[0025] In summary, the present application has at least one of the following beneficial technical effects:

[0026] The battery body adopts a wrapped shell structure design, without the need to punch a pit body on the aluminum plastic film of the main body, simplifying the structure, making it easy to manufacture, and reducing the required cost.

[0027] The first cover and the second cover made of aluminum, stainless steel or high polymer forming material have stronger mechanical strength, machinability and stamping resistance, and the recess formed by stamping has a free size and high stamping precision.

[0028] 3. Not limited to the depth of the aluminum plastic film pit, eliminating the hidden dangers of aluminum plastic film cracks or damage caused by pit punching.

[0029] 4. The thickness of the battery can be continuously stacked by thickening a single bare cell or connecting multiple bare cells in series or parallel, which can correspondingly reduce the length and width of the battery, making the battery production operation more convenient and improving efficiency and qualification rate.

[0030] 5. The wrapped shell battery structure can be used to package various series, parallel or series-parallel bare cells, and has good versatility. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structure diagram of a wrapped shell battery with a centered side seal in an embodiment of the present application;

[0032] Figure 2 is a structure diagram of a first cover and a second cover in an embodiment of the present application;

[0033] Figure 3 is a cross-sectional view of a wrapped shell battery adapted to a double-head tab cell in an embodiment of the present application;

[0034] Figure 4 is a structure diagram of a wrapped shell battery with a side seal on one side in an embodiment of the present application;

[0035] Figure 5 is a process diagram of a wrapped shell battery with a side seal on one side in an embodiment of the present application;

[0036] Figure 6 is a structure diagram of a wrapped shell battery with a blade-shaped shell body in another embodiment of the present application;

[0037] Figure 7is a structure schematic view of a wrapped cell when the shell body is a square shell in another embodiment of the present application.

[0038] Reference signs: 1, shell body; 2, first cover body; 3, second cover body; 4, recess; 5, first sealing layer; 6, protrusion; 7, accommodation opening; 8, second sealing layer; 9, third sealing layer; 10, pole; 11, explosion-proof valve. DETAILED DESCRIPTION

[0039] The exemplary embodiments of the present application are described below with reference to the accompanying drawings, which include various details of the embodiments of the present application to assist in understanding them. These should be considered as merely exemplary. Thus, those of ordinary skill in the art will recognize various changes and modifications of the embodiments described herein, which do not depart from the scope and spirit of the present application. Also, for the sake of clarity and conciseness, the description below omits the description of well-known functions and structures.

[0040] It should be noted that the terms "first", "second", and the like in the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The implementation described in the following exemplary embodiments does not represent all implementations consistent with the present disclosure.

[0041] In addition, the term "and / or" in this paper is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents an "or" relationship between the associated objects unless otherwise specified.

[0042] A wrapped cell of the present application is described below with reference to the accompanying drawings.

[0043] Referring to Figures 1 to 5The wrapped shell battery comprises a shell body 1 for accommodating a plurality of battery cells, the shell body 1 is made of an aluminum plastic film, the shell body 1 is wrapped around the outside of the battery cell, the shell body 1 is open at both ends and is respectively provided with a first cover 2 and a second cover 3, the materials of the first cover 2 and the second cover 3 are aluminum, stainless steel or high polymer forming material, the first cover 2 and the second cover 3 are both provided with a recess 4 in a punching manner, the recess 4 is located inside the shell body 1, a first sealing layer 5 is arranged between the outer side wall of the recess 4 and the inner side wall of the shell body 1, the recess 4 located on the first cover 2 is provided with a protrusion 6, a plurality of accommodation openings 7 are arranged on the protrusion 6 corresponding to the number of the battery cell tabs, and a second sealing layer 8 is arranged between the inner side wall of the protrusion 6 and the battery cell tabs, wherein the open-ended shell body 1 is matched with the first cover 2 and the second cover 3, and the first sealing layer 5 is arranged between the recess 4 provided on the first cover 2 and the second cover 3 and the shell body 1 to form a wrapped shell structure for accommodating the battery cell, which can complete the complete battery packaging without relying on the punching depth of the aluminum plastic film to accommodate the battery cell, and the size of the wrapped structure can be flexibly adjusted according to the size or the number of the battery cell, thereby eliminating the problem of damage to the aluminum plastic film caused by excessive punching depth. Meanwhile, the aluminum plastic film is wrapped around the battery cell to form a shell body 1 without punching, thereby ensuring the consistency and stability of the aluminum plastic film structure of the battery cell body, and the protrusion 6 and the accommodation opening 7 arranged on the recess 4 of the first cover 2 can lead out the battery cell tabs and adapt to the position of the battery cell tabs, and the second sealing layer 8 arranged between the inner side wall of the protrusion 6 and the battery cell tabs can ensure the sealing of the battery cell tabs. Meanwhile, the first cover 2 and the second cover 3 made of aluminum, stainless steel or high polymer forming material have higher mechanical strength, processing performance and punching resistance, and the recess 4 formed by punching has a freely controlled size and high punching precision.

[0044] Specifically, when the materials of the first cover 2 and the second cover 3 are made of high polymer forming material, the high polymer forming material can be polypropylene (PP), polycarbonate (PC), polyamide (PA, nylon) and other materials with high mechanical strength, excellent processing performance and good impact resistance, which are not limited here.

[0045] It should be noted that the battery cell packaged inside the shell body 1 can be a single bare battery cell or a plurality of bare battery cells connected in series, parallel or series-parallel to embody the universality of the wrapped shell packaging structure, and as shown in Figure 1 and Figure 4 The side sealing edge of the shell body 1 needs to be arranged on one side or in the center of the battery according to the design requirements, which is not limited here.

[0046] It should be further explained that generally, the sealant is arranged at the electrode tab of the battery cell, and the second sealing layer 8 can be arranged between the inner wall of the protrusion 6 and the sealant of the electrode tab of the battery cell, so as to achieve the effect of secondary sealing.

[0047] In addition, in an embodiment, the protrusion 6 is arranged on the recess 4 of the first cover 2 and the second cover 3, and the protrusion 6 is arranged on the recess 4 of the first cover 2 and the second cover 3. For the battery cell with electrode tabs at both ends, the corresponding gap 7 can be provided, so that the electrode tab of the battery cell can be smoothly led out, and the working condition of the battery cell with electrode tabs at both ends is suitable.

[0048] Preferably, the first sealing layer 5 and the second sealing layer 8 are formed by hot melting, and the hot melting sealing has strong adaptability, good sealing effect and high sealing efficiency, and is suitable for the working condition of the soft package battery.

[0049] Preferably, the first sealing layer 5 and the second sealing layer 8 are annular in shape, and the annular first sealing layer 5 and the second sealing layer 8 are adopted to ensure complete sealing.

[0050] Further, the third sealing layer 9 is arranged on the side seal of the shell body 1 by hot melting, and the third sealing layer 9 is formed by hot melting after the aluminum plastic film is wrapped, so as to complete the hot melting packaging, improve the sealing effect of the shell body 1, and be suitable for the working condition of the soft package battery.

[0051] In addition, the shell body 1 and the first cover 2, the shell body 1 and the second cover 3, and the side seal of the shell body 1 itself are fixed by folding, and after the shell body 1 and the first cover 2 are sealed by the first sealing layer 5, the shell body 1 and the second cover 3 are sealed by the first sealing layer 5, and the side seal of the shell body 1 is sealed by the third sealing layer 9, they are folded and fixed, which can further improve the sealing property of the packaging structure, and at the same time, the size of the packaging structure can be reduced, that is, the overall size of the battery is reduced, and the effect of optimizing the space of the packaging structure is achieved.

[0052] In addition, as shown in FIG. 6, the first cover 2 and the second cover 3 are arranged on the shell body 1, and the first cover 2 and the second cover 3 are arranged on the shell body 1. Figure 6 and Figure 7As shown, in an embodiment, a wrapped shell battery includes a shell body 1 for accommodating a plurality of battery cells, the shell body 1 is made of an aluminum plastic film, the shell body 1 is installed on the outside of the battery cell in a wrapped manner, the shell body 1 is open at both ends and is respectively provided with a first cover 2 and a second cover 3, the materials of the first cover 2 and the second cover 3 are aluminum, stainless steel or high polymer forming material, the first cover 2 is provided with a pole 10 corresponding to the position of the tab of the battery cell, the pole 10 is used for electrical connection to the tab of the battery cell, unlike the wrapped shell battery in the above embodiment, this structure can also complete the complete battery packaging, without relying on the punching depth of the aluminum plastic film to accommodate the battery cell, the size of the wrapped structure can be flexibly adjusted according to the size of the battery cell or the number of battery cells, and the problem of damage of the aluminum plastic film caused by too deep punching can be eliminated, compared with the technical solutions of opening the recess 4, the protrusion 6 and the accommodation opening 7 on the first cover 2 and the second cover 3, the pole 10 is directly electrically connected to the tab of the battery cell, which can also realize the function of leading out the tab of the battery cell for use, and also plays a role in protecting the tab of the battery cell, and the safety is higher.

[0053] Specifically, the pole 10 and the tab of the battery cell are electrically connected by internal welding, and the internal welding ensures close contact between the pole 10 and the tab, reduces the contact resistance, and improves the conductivity efficiency.

[0054] Among them, the shape of the shell body 1 can be selected as a blade or a square shell, the blade-shaped shell body 1 has the characteristics of high space utilization, good heat dissipation performance, etc., and is suitable for the working conditions of high-power and high-energy density batteries, the manufacturing process of the square shell-shaped shell body 1 is mature, the mechanical stability is strong, the anti-deformation ability is strong, and it is widely used in various batteries and is suitable for large-scale production.

[0055] Further, the first cover 2 and the second cover 3 are both provided with a pole 10 corresponding to the position of the tab of the battery cell, and for the battery cell with tabs at both ends, the corresponding positive pole 10 or negative pole 10 can be provided, so that the tab of the battery cell can be electrically connected smoothly, and it is suitable for the working conditions of the battery cell with tabs at both ends.

[0056] In addition, the first cover 2 and the second cover 3 are both provided with an explosion-proof valve 11 for releasing pressure when the internal pressure of the battery abnormally rises to prevent the battery from exploding or rupturing.

[0057] It should be noted that the soft package battery of the wrapped shell battery structure is manufactured as follows: the size of the aluminum plastic film is determined according to the size of the battery cell to ensure that the aluminum plastic film can completely wrap the battery cell and leave sufficient excess for subsequent hot melt packaging, and after the battery cell is completely wrapped by the aluminum plastic film, the battery cell and the aluminum plastic film are tightly combined by external compaction and fixation, then after the first cover 2 and the second cover 3 formed by punching are assembled and hot melt packaged, the manufacture of the soft package battery of the wrapped shell battery structure is completed.

[0058] The above detailed description does not limit the scope of the application. Various modifications, combinations, sub-combinations and alternatives can be made to the detailed embodiment disclosed herein without departing from the spirit and the principles of the application. Any modification, equivalent replacement or improvement made within the spirit and principles of the application shall fall within the scope of the application.

Claims

1. A type of encased battery, characterized in that, include: A housing body (1) for accommodating several battery cells. The housing body (1) is made of aluminum-plastic film. The housing body (1) is installed on the outside of the battery cells in a wrapping manner. The housing body (1) has openings at both ends and is provided with a first cover (2) and a second cover (3) respectively. The first cover (2) and the second cover (3) are made of aluminum, stainless steel or polymer molding material. The first cover (2) and the second cover (3) are both provided with recesses (4) by stamping. The recesses (4) are located inside the housing body (1). A first sealing layer (5) is provided between the outer wall of the recesses (4) and the inner wall of the housing body (1). The recesses (4) located in the first cover (2) are provided with protrusions (6). The protrusions (6) are provided with several clearance openings (7) corresponding to the number of battery cell tabs. A second sealing layer (8) is provided between the inner wall of the protrusions (6) and the battery cell tabs.

2. A battery with a casing as described in claim 1, characterized in that, The recesses (4) located in the first cover (2) and the second cover (3) are both provided with protrusions (6).

3. A battery with a casing as described in claim 1, characterized in that, Both the first sealing layer (5) and the second sealing layer (8) are formed by hot melting.

4. A battery with a casing as described in claim 1, characterized in that, Both the first sealing layer (5) and the second sealing layer (8) are annular in shape.

5. A battery with a casing as described in claim 1, characterized in that, The outer shell body (1) has a third sealing layer (9) provided at the side seal by heat fusion.

6. A battery with a casing as described in claim 5, characterized in that, The outer shell body (1) and the first cover (2), the outer shell body (1) and the second cover (3), and the side seal of the outer shell body (1) are all connected and fixed to each other by folding.

7. A type of encased battery, characterized in that, include: The outer casing (1) is used to accommodate several battery cells. The outer casing (1) is made of aluminum-plastic film. The outer casing (1) is installed on the outside of the battery cells in a wrapping manner. The outer casing (1) has openings at both ends and is provided with a first cover (2) and a second cover (3) respectively. The first cover (2) and the second cover (3) are made of aluminum, stainless steel or polymer molding material. The first cover (2) is provided with a pole post (10) at the position corresponding to the battery cell tab. The pole post (10) is used for electrical connection to the battery cell tab.

8. A battery with a casing as described in claim 7, characterized in that, The electrode post (10) is electrically connected to the battery cell tab by internal welding.

9. A battery with a casing as described in claim 7, characterized in that, Both the first cover (2) and the second cover (3) are provided with pole posts (10) at the positions corresponding to the battery cell tabs.

10. A battery with a casing as described in claim 7, characterized in that, The outer shell body (1) is blade-shaped or square-shaped.

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