A flexible lithium-ion battery pack

Abstract

The present application relates to a flexible lithium-ion battery pack, and to the field of lithium-ion batteries. A flexible lithium-ion battery pack comprises: a battery module, comprising a battery cell, a connecting wire, and a charge and discharge interface, wherein a plurality of battery cells are connected in series via connecting wires, and the charge and discharge interface is electrically connected to the battery cells at the ends via connecting wires; a packaging shell, comprising an upper shell and a lower shell for packaging the battery module, wherein the upper shell and the lower shell are buckled together and form a packaging cavity inside, and the battery module is fixed in the packaging cavity, and the upper shell and the lower shell are both soft silicone shells, and the outer surfaces of the upper shell and the lower shell are provided with a plurality of criss-crossing deformation grooves. The present application makes the packaging shell of the battery pack a soft silicone shell, and provides a plurality of criss-crossing deformation grooves on the outer surface of the packaging shell, so that the entire battery pack has a high degree of flexibility and deformability.

Description

Technical Field

[0001] The present application relates to the field of lithium-ion batteries, and in particular to a flexible lithium-ion battery pack. Background Art

[0002] Lithium-ion batteries are secondary batteries (rechargeable batteries) that rely on the movement of lithium ions between the positive and negative electrodes to work. During the charge and discharge process, Li+ is inserted and deintercalated back and forth between the two electrodes. + It is deintercalated from the positive electrode and embedded in the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. According to the type of positive electrode material, lithium-ion batteries can be divided into lithium cobalt oxide batteries, lithium manganese oxide batteries, lithium iron phosphate batteries and ternary material batteries. Lithium-ion batteries have the advantages of high single-cell voltage, long cycle life and low self-discharge rate. Therefore, the current application range of lithium-ion batteries is extremely wide. In addition to a large number of civilian applications such as mobile phones, electric vehicles, energy storage, and power supplies, they are also widely used in military applications.

[0003] In the related art, the outer shell of lithium-ion power sources is metal or hard plastic shell, and the battery core is liquid electrolyte. Neither the shell nor the battery core can be bent, and it cannot be used for portable and bendable devices. Therefore, it is urgent to provide a bendable flexible battery to adapt to the different usage forms of electronic products. It is understandable that the flexibility of flexible batteries is the key performance to ensure the quality of flexible batteries. Utility Model Content

[0004] In order to improve the defect that lithium-ion batteries in the related art cannot be bent and deformed, the present application provides a flexible lithium-ion battery pack.

[0005] The flexible lithium-ion battery pack provided in this application adopts the following technical solution:

[0006] A flexible lithium-ion battery pack, comprising:

[0007] A battery module, comprising a battery cell, a connecting wire, and a charge-discharge interface, wherein a plurality of battery cells are connected in series via the connecting wire, and the charge-discharge interface is electrically connected to the battery cell at the end via the connecting wire;

[0008] The packaging shell includes an upper shell and a lower shell for packaging the battery module. The upper shell and the lower shell are buckled together to form a packaging cavity inside. The multiple battery cells are independently fixed in the packaging cavity. The upper shell and the lower shell are both soft silicone shells, and the outer surfaces of the upper shell and the lower shell are provided with multiple criss-cross deformation grooves.

[0009] Optionally, the battery core includes a polymer soft shell and a gel electrolyte filled in the polymer soft shell.

[0010] Optionally, the connecting wire includes a flexible wire and a soft silicone coating layer coated on the outside of the flexible wire.

[0011] Optionally, the deformation groove includes any one of a U-shaped groove, a V-shaped groove, an arc groove, and a dovetail groove.

[0012] Optionally, the groove wall of the deformation groove forms a raised limiting strip inside the packaging shell, and the criss-crossing limiting strips surround and form a mounting groove for fixing the battery cell.

[0013] Optionally, the battery pack also includes a display screen connected to the battery cell via a connecting wire.

[0014] Optionally, the packaging shell is coated with a waterproof and breathable membrane.

[0015] Optionally, the material of the polymer soft shell includes at least one of polyolefin, polyester and polyamide.

[0016] Optionally, the material of the packaging shell and the soft silicone coating layer includes at least one of silicone rubber, modified silicone rubber, thermoplastic silicone, liquid silicone and gas phase silicone.

[0017] Optionally, the flexible wire includes any one of a copper wire, an aluminum wire, a silver wire, and an alloy wire.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] 1. This application makes the battery pack packaging shell a soft silicone shell, and opens a plurality of crisscross deformation grooves on the outer surface, so that the above structure makes the entire battery pack highly flexible and deformable. The above structure enables the battery pack to adapt to the installation requirements of various complex shapes and spaces, improves the adaptability and use range of the battery pack, and effectively expands the use scenarios of lithium-ion battery packs.

[0020] 2. The battery cell of the present application uses a polymer soft shell to cover the gel electrolyte, which further enhances the flexibility of the battery pack. This design enables the battery pack to maintain stable electrochemical performance when it is bent, twisted, etc., thereby improving the safety and reliability of the battery pack.

[0021] 3. In the present application, the groove wall of the deformation groove is designed to form a limit bar inside the packaging shell, and the limit bar is used to enclose a mounting groove for fixing the battery cell. The above structure can effectively fix the battery cell and prevent the battery cell from moving or shaking inside the battery pack, thereby improving the stability and safety of the battery pack.

[0022] 4. The present application coats a waterproof and breathable film on the outside of the packaging shell, which can not only prevent moisture from entering the battery pack and causing damage to the battery cells or short circuits, but also maintain the air permeability inside the battery pack and prevent the gas generated by the battery cells during the charging and discharging process from causing excessive internal pressure in the battery pack, thereby ensuring the safety and stability of the battery pack during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of a flexible lithium-ion battery pack according to an embodiment of the present application;

[0024] Figure 2 It is a schematic diagram of an exploded structure of a packaging shell of a flexible lithium-ion battery pack according to an embodiment of the present application;

[0025] Figure 3 It is a schematic structural diagram of a battery cell of a flexible lithium-ion battery pack according to an embodiment of the present application;

[0026] Figure 4 It is a cross-sectional view of a connecting line of a flexible lithium-ion battery pack according to an embodiment of the present application.

[0027] Explanation of the accompanying drawings: 1. packaging shell; 11. upper shell; 12. lower shell; 13. packaging cavity; 14. deformation groove; 141. limit strip; 142. installation groove; 2. battery module; 21. battery cell; 22. connecting wire; 221. flexible wire; 222. soft silicone coating; 23. charging and discharging interface; 3. display screen. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-4 This application is described in further detail.

[0029] The present application embodiment discloses a flexible lithium-ion battery pack. Figure 1 , Figure 2 and Figure 3 A flexible lithium-ion battery pack includes a packaging shell 1, a battery module 2 and a display screen 3.

[0030] Reference Figure 1 and Figure 2The packaging shell 1 includes an upper shell 11 and a lower shell 12 that are fixed together. Both the upper shell 11 and the lower shell 12 are soft silicone shells. In this embodiment, both the upper shell 11 and the lower shell 12 are made of silicone rubber. Silicone rubber has the characteristics of good elasticity, high temperature resistance, oxidation resistance, corrosion resistance, electrical insulation and physiological inertness. Siloxane chain segments are introduced into the molecular chain of silicone rubber, which makes it have excellent high and low temperature resistance and can maintain stable performance under extreme temperature conditions. In other embodiments, the upper shell 11 and the lower shell 12 can also be made of modified silicone rubber, thermoplastic silicone, liquid silicone or gas phase silicone. The outer surface of the packaging shell 1 is coated with a waterproof and breathable membrane. The waterproof and breathable membrane can prevent moisture from entering the interior of the battery pack, causing damage or short circuit of the multiple battery cells 21 fixed in the packaging cavity 13. It can also maintain the air permeability inside the battery pack to prevent the gas generated by the battery cells 21 during the charging and discharging process from causing excessive internal pressure in the battery pack and causing bulging.

[0031] Reference Figure 1 , Figure 2 and Figure 3 The upper shell 11 and the lower shell 12 are buckled together and form a packaging cavity 13 inside. The battery module 2 is fixed in the packaging cavity 13, that is, the multiple battery cells 21 are independently fixed in the packaging cavity 13. The outer surfaces of the upper shell 11 and the lower shell 12 are provided with a plurality of criss-crossing deformation grooves 14. In this embodiment, the interface of the deformation groove 14 is a U-shaped groove. In other embodiments, the deformation groove 14 can also be set to a V-shaped groove, an arc groove, a dovetail groove, etc.

[0032] Reference Figure 2 , Figure 3 and Figure 4 The battery module 2 includes a battery cell 21 , a connecting line 22 , and a charge and discharge interface 23 .

[0033] Reference Figure 1 , Figure 2 and Figure 3 There are multiple battery cells 21. In this embodiment, 12 battery cells 21 are arranged. The 12 battery cells 21 are distributed in a 3×4 rectangular shape. The groove wall of the deformation groove 14 forms a raised limiting strip 141 inside the packaging shell 1. The criss-crossing limiting strips 141 surround and form a mounting groove 142 for fixing the battery cell 21. Each battery cell 21 is snapped into the corresponding mounting groove 142.

[0034] Reference Figure 1 , Figure 2 and Figure 3 In this embodiment, the battery cell 21 is in a flat shape. In other embodiments, the battery cell 21 can also be designed as a cylindrical, square, triangular, etc. The battery cell 21 includes a polymer soft shell and a gel electrolyte filled in the polymer soft shell. In this embodiment, the polymer soft shell is made of polyolefin resin material. In other embodiments, the polymer soft shell can also be made of flexible polymers such as polyester and polyamide.

[0035] Reference Figure 2 , Figure 3 and Figure 4 The cells 21 are connected in series through the connecting wires 22, the charge and discharge interface 23 is electrically connected to the cell 21 at the end through the connecting wires 22, the charge and discharge interface 23 is embedded in the package shell 1 and the interface is exposed outside the package shell 1. The display screen 3 is electrically connected to the cell 21 through the connecting wires 22. The display screen 3 is used to display the battery pack power and operating temperature.

[0036] Reference Figure 4 The connecting wire 22 includes a flexible wire 221 and a soft silicone coating layer 222 coated on the outside of the flexible wire 221. In this embodiment, the flexible wire 221 is made of copper wire, and the soft silicone coating layer 222 is made of silicone rubber material.

[0037] The implementation principle of a flexible lithium-ion battery pack in an embodiment of the present application is as follows: The implementation principle of a flexible lithium-ion battery pack in an embodiment of the present application is mainly reflected in its structural design and material selection to achieve flexibility, durability and safety of the battery pack.

[0038] First, silicone rubber is used as the material of the upper shell 11 and the lower shell 12 of the packaging shell 1, which gives the battery pack good elasticity and high and low temperature resistance. This enables the battery pack to maintain a stable structure and performance when subjected to external force extrusion or temperature changes, avoiding damage caused by external force or temperature. Secondly, by opening criss-cross deformation grooves 14 on the outer surfaces of the upper shell 11 and the lower shell 12, and forming raised limit bars 141 inside them, these limit bars 141 enclose a mounting groove 142 for fixing the battery cell 21. This design not only provides stable support for the battery cell 21, but also allows the battery pack to absorb and disperse stress through the deformation of the deformation groove 14 when subjected to external force, thereby achieving flexible deformation and protecting the battery cell 21 from damage. In addition, the deformation groove 14 enables the battery pack to actively adapt to the installation requirements of various complex shapes and spaces, improves the adaptability and scope of use of the battery pack, and effectively expands the use scenarios of the lithium-ion battery pack.

[0039] At the same time, the battery cell 21 itself adopts a polymer soft shell and a gel electrolyte, which further enhances the flexibility of the battery pack. The selection of the polymer soft shell enables the battery cell 21 itself to have a certain deformation ability, while the gel electrolyte can reduce the fluidity of the electrolyte and reduce the risk of leakage while ensuring the battery performance.

[0040] In addition, the use of the waterproof breathable membrane effectively prevents moisture from entering the battery pack, avoiding the risk of damage or short circuit of the battery cell 21. At the same time, it also maintains the air permeability inside the battery pack, preventing the gas generated by the battery cell 21 during the charging and discharging process from causing excessive internal pressure in the battery pack and causing bulging.

[0041] Finally, the addition of the display screen 3 allows the user to intuitively understand the power level and operating temperature of the battery pack, thereby improving the convenience and safety of use.

[0042] In summary, the flexible lithium-ion battery pack of the embodiment of the present application achieves flexibility, durability and safety of the battery pack through reasonable structural design and material selection, providing users with a safer, more reliable and convenient battery usage experience.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A flexible lithium-ion battery pack, characterized in that: include: A battery module (2), comprising a plurality of battery cells (21) connected in series; The packaging shell (1) comprises an upper shell (11) and a lower shell (12) for packaging the battery module (2); the upper shell (11) and the lower shell (12) are buckled together to form a packaging cavity (13) inside; a plurality of battery cells (21) are independently fixed in the packaging cavity (13); the upper shell (11) and the lower shell (12) are both soft silicone shells; and the outer surfaces of the upper shell (11) and the lower shell (12) are provided with a plurality of criss-crossing deformation grooves (14).

2. A flexible lithium-ion battery pack according to claim 1, characterized in that: The battery module (2) further comprises a connecting wire (22) and a charge-discharge interface (23); a plurality of battery cells (21) are connected in series via the connecting wire (22); the charge-discharge interface (23) is electrically connected to the battery cell (21) at the end via the connecting wire (22); the battery cell (21) comprises a polymer soft shell and a gel electrolyte filled in the polymer soft shell.

3. A flexible lithium-ion battery pack according to claim 2, characterized in that: The connecting wire (22) comprises a flexible wire (221) and a soft silica gel coating layer (222) coating the flexible wire (221).

4. The flexible lithium-ion battery pack according to claim 1, characterized in that: The deformation groove (14) comprises any one of a U-shaped groove, a V-shaped groove, an arc groove and a dovetail groove.

5. The flexible lithium-ion battery pack according to claim 1, characterized in that: The groove wall of the deformation groove (14) forms a protruding limiting strip (141) inside the packaging shell (1), and the crisscross limiting strips (141) surround and form a mounting groove (142) for fixing the battery core (21).

6. The flexible lithium-ion battery pack according to claim 1, characterized in that: The battery pack also includes a display screen (3) connected to the battery cell (21) via a connecting line (22).

7. The flexible lithium-ion battery pack according to claim 1, characterized in that: The packaging shell (1) is coated with a waterproof and breathable membrane.

8. The flexible lithium-ion battery pack according to claim 2, characterized in that: The material of the polymer soft shell includes at least one of polyolefin, polyester and polyamide.

9. The flexible lithium-ion battery pack according to claim 3, characterized in that: The material of the packaging shell (1) and the soft silicone coating layer (222) includes at least one of silicone rubber, modified silicone rubber, thermoplastic silicone, liquid silicone and gas phase silicone.

10. The flexible lithium-ion battery pack according to claim 3, characterized in that: The flexible wire (221) comprises any one of a copper wire, an aluminum wire, a silver wire, and an alloy wire.

Images