Polymer soft package cylindrical lithium battery

Abstract

The utility model discloses a polymer soft package cylindrical lithium battery which comprises a lithium battery body, a soft package shell is sleeved outside the lithium battery body, inner grooves are formed in the outer walls of the top end and the bottom end of the soft package shell, the inner grooves are threaded grooves, and a buffer inner layer is arranged between the upper inner groove and the lower inner groove and located in the soft package shell. The buffer inner layer is filled with a plurality of silica gel fillers, the silica gel fillers are elastic silica gel particles, an upper end cap is arranged at the top end of the soft package shell, an upper threaded piece is fixedly installed on the lower surface of the upper end cap, an upper threaded part matched with the inner groove in the upper portion is arranged outside the upper threaded piece, and a conductive contact is fixedly installed at the top end of the upper end cap. According to the polymer soft package cylindrical lithium battery disclosed by the utility model, the soft package type external protection structure is arranged outside the lithium battery, so that in actual use, the lithium battery body can be subjected to package type external protection, and the overall external protection effect of the lithium battery is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and particularly relates to a polymer soft-pack cylindrical lithium battery. Background Technique

[0002] Lithium batteries are a type of battery with lithium metal or lithium alloy as the positive / negative electrode material and using a non-aqueous electrolyte solution. Due to their advantages such as high energy density, long life, light weight, and environmental protection, they are widely used in multiple fields;

[0003] The working principle of lithium batteries is mainly based on the intercalation and deintercalation process of lithium ions. During charging, lithium ions escape from the positive electrode and intercalate into the negative electrode through the electrolyte; during discharging, the opposite occurs, lithium ions escape from the negative electrode and intercalate into the positive electrode through the electrolyte. In this process, electrons flow from the negative electrode to the positive electrode through the external circuit, thereby generating electrical energy;

[0004] Polymer soft-pack lithium batteries, also known as polymer lithium batteries, are actually lithium batteries that use aluminum-plastic packaging film as the packaging material, and they are also a type of lithium-ion battery;

[0005] In the existing polymer soft-pack lithium batteries, the external soft-pack layer is directly exposed to the external environment during use. Therefore, the protection performance of the battery exterior is poor, and when subjected to external force impacts, it will directly act on the battery body, resulting in insufficient external protection performance. For this reason, the utility model proposes a protective polymer soft-pack cylindrical lithium battery. Content of the Utility Model

[0006] The purpose of the utility model is to provide a polymer soft-pack cylindrical lithium battery to solve the problems proposed in the above background technique.

[0007] To achieve the above purpose, the utility model provides the following technical solution: a polymer soft-pack cylindrical lithium battery, including a lithium battery body, a soft-pack outer shell is sleeved outside the lithium battery body, inner grooves are respectively opened on the outer walls of the top and bottom ends of the soft-pack outer shell, the inner grooves are thread grooves, and a buffer inner layer is arranged inside the soft-pack outer shell between the upper and lower inner grooves. A number of silica gel fillers are filled inside the buffer inner layer, the silica gel fillers are elastic silica gel particles, an upper end cap is arranged at the top of the soft-pack outer shell, an upper threaded part is fixedly installed on the lower surface of the upper end cap, an upper threaded portion adapted to the upper inner groove is arranged outside the upper threaded part, and a conductive contact is fixedly installed at the top of the upper end cap.

[0008] Preferably, a lower threaded part adapted to the lower inner groove is arranged at the bottom of the soft-pack outer shell, and a lower threaded portion is arranged on the outer surface of the lower threaded part.

[0009] Preferably, a conductive contact piece is fixedly installed at the bottom end of the lower threaded part, and a lower conductive column is fixedly installed at the center position of the upper surface of the conductive contact piece.

[0010] Preferably, both the conductive contact piece and the lower conductive column are made of conductive metal materials.

[0011] Preferably, the thickness of the soft package outer shell is between 1.5 - 2.3 mm, and the thickness of the buffer inner layer is between 1.3 - 2.1 mm.

[0012] Preferably, the conductive contact head is a metal contact head made of conductive metal.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] For the polymer soft - package cylindrical lithium battery of the present utility model, by providing a soft - package type external protection structure outside the lithium battery, during actual use, it can provide wrapped external protection for the lithium battery body, effectively improving the overall external protection effect of the lithium battery. And when the soft - package outer shell is subjected to external forces, such as dropping or bumping external force impacts, etc., the external force acting on the soft - package outer shell may cause the soft - package outer shell to produce an inward concave deformation. Through the external force effect of the concave deformation, it can act on the silica gel filler, so that the silica gel filler can resist and buffer the external force to a certain extent, making the silica gel filler the final force - receiving and buffering structure, playing a certain inner - layer buffering and protecting effect, avoiding the external force directly acting on the lithium battery body through the soft - package outer shell, thereby better protecting the internal lithium battery body from external force impacts, preventing the lithium battery body from deforming under force, and improving the overall protection performance and the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the equidistant separation structure between the lithium battery body and the soft - package outer shell in the embodiment of the present utility model from top to bottom;

[0016] Figure 2 It is a schematic diagram of the bottom upward view structure between the lithium battery body and the soft - package outer shell in the embodiment of the present utility model;

[0017] Figure 3 It is a schematic diagram of the overall top structure between the lithium battery body and the soft - package outer shell in the embodiment of the present utility model;

[0018] Figure 4 For the embodiment of the present utility model Figure 3 Schematic diagram of the enlarged structure of area A;

[0019] Figure 5 It is a schematic diagram of the upper - end face structure of the conductive contact piece in the embodiment of the present utility model.

[0020] Figure 6Schematic diagram of the internal sectional structure of the soft-pack housing according to an embodiment of the present utility model.

[0021] In the figure: 1, lithium battery body; 101, positive extreme; 102, negative extreme; 2, soft-pack housing; 3, inner groove; 4, upper end cap; 5, conductive contact; 6, upper threaded part; 7, lower threaded part; 8, conductive contact piece; 9, silica gel filler; 10, lower conductive column. Detailed implementation manners

[0022] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0025] Please refer to Figures 1-6 , an embodiment provided by the present utility model: a polymer soft-pack cylindrical lithium battery, including a lithium battery body 1, a positive extreme 101 is arranged at the top end of the lithium battery body 1, and a negative extreme 102 is arranged at the bottom end of the lithium battery body 1;

[0026] A soft-pack outer shell 2 is sleeved outside the lithium battery body 1, so that the internal lithium battery body 1 can be externally wrapped and protected through the provided soft-pack outer shell 2, effectively improving the protection effect of the internal lithium battery body and extending the service life of the lithium battery body 1. Inner grooves 3 are formed on the outer walls of the top and bottom ends of the soft-pack outer shell 2, and the inner grooves 3 are threaded grooves;

[0027] For details, refer to the attached Figure 6 As shown in the figure, the buffer inner layer is located inside the soft-pack outer shell 2 between the upper and lower inner grooves 3, and a number of silica gel fillers 9 are filled inside the buffer inner layer. The silica gel fillers 9 are elastic silica gel particles;

[0028] With this structural design, a buffer inner layer is provided inside the soft-pack outer shell 2, and a number of silica gel fillers 9 are filled inside the buffer inner layer. When the soft-pack outer shell 2 is subjected to external forces, such as dropping or bumping external impacts, etc., the external force acting on the soft-pack outer shell 2 may cause the soft-pack outer shell 2 to produce an inward dent deformation. The external force effect of the dent deformation can act on the silica gel fillers 9, so that the silica gel fillers 9 can resist and buffer the external force to a certain extent, making the silica gel fillers 9 the final force-bearing buffer structure, playing a certain inner layer buffer protection effect, preventing the external force from directly acting on the lithium battery body 1 through the soft-pack outer shell 2, thus better protecting the internal lithium battery body 1 from external impact, preventing the lithium battery body 1 from deforming under force, and improving the overall protection performance and the service life of the battery;

[0029] In order to wrap and protect the top of the lithium battery body 1, an upper end cap 4 is provided at the top end of the soft-pack outer shell 2. A upper threaded part 6 is fixedly installed on the lower surface of the upper end cap 4. An upper thread portion adapted to the upper inner groove 3 above is provided outside the upper threaded part 6. A conductive contact 5 is fixedly installed at the top end of the upper end cap 4. In order to ensure the wrapping and conductive effect of the upper end part, the conductive contact 5 is a metal contact made of conductive metal;

[0030] With this structural design, during the battery assembly, the upper end cap 4 of the present invention can be screwed into the upper groove of the soft-pack outer shell 2 through the upper threaded part 6 to complete the top connection work between the upper end cap 4 and the soft-pack housing 2;

[0031] After the upper end cap 4 is threadedly connected, the upper end cap 4 can be wrapped outside the positive extreme 101 of the lithium battery body 1 to externally protect the top of the lithium battery body 1 in a wrapped manner. The conductive contact 5 provided can be electrically connected to the positive extreme 101 at its inner wall after connection to ensure the normal discharging use effect of the lithium battery.

[0032] In this embodiment, a lower threaded part 7 adapted to the lower inner groove 3 is provided at the bottom end of the soft-pack outer shell 2, and a lower thread portion is provided on the outer surface of the lower threaded part 7;

[0033] Further, specifically referring to the attached drawings of the specification Figure 6 As shown, a conductive contact piece 8 is fixedly installed at the bottom end of the lower threaded part 7, and a lower conductive column 10 is fixedly installed at the center position of the upper surface of the conductive contact piece 8;

[0034] This structural design has the same function as the above-mentioned upper end cap 4, that is, it externally wraps and protects the negative electrode end 102 of the lithium battery body 1. The lower threaded part 7 can be threadedly connected to the lower inner groove 3 of the soft package shell 2. After the lower threaded part 7 is threadedly connected, the lower conductive column 10 at its bottom end can conductively contact the negative electrode end 102, thereby having a certain conductive connection effect. The lower conductive column 10 transfers electrical energy to the conductive contact piece 8, and thus the conductive contact piece 8 can be conductively connected to the outside world through the setting, ensuring the conductive use effect of the negative electrode of the battery.

[0035] In this embodiment, in order to ensure the metal conductivity of the conductive contact piece 8 and the lower conductive column 10, both the conductive contact piece 8 and the lower conductive column 10 are made of conductive metal materials.

[0036] In this embodiment, in order to improve the ultra-thin use characteristics of the soft package shell 2, the thickness of the soft package shell 2 is between 1.5 - 2.3 mm, and the thickness of the buffer inner layer is between 1.3 - 2.1 mm.

[0037] Working principle: The utility model is provided with a lower wrapping protection structure composed of an upper end cap 4, a lower threaded part 7, and a conductive contact piece 8 at the positive electrode end 101 and the negative electrode end 102 of the lithium battery body 1 respectively. During actual assembly, the upper end cap 4 of the utility model can be screwed into the upper groove of the soft package shell 2 by rotating the upper threaded part 6, thereby completing the top connection work between the upper end cap 4 and the soft package shell 2. After the upper end cap 4 is threadedly connected, the upper end cap 4 can wrap around the outside of the positive electrode end 101 of the lithium battery body 1, thereby providing a wrapped external protection for the top of the lithium battery body 1. And through the setting of the conductive contact 5, its inner wall can conductively connect to the positive electrode end 101 after connection, ensuring the normal discharge use effect of the lithium battery;

[0038] It has the same function as the above-mentioned upper end cap 4, that is, it externally wraps and protects the negative electrode end 102 of the lithium battery body 1. The lower threaded part 7 can be threadedly connected to the lower inner groove 3 of the soft package shell 2. After the lower threaded part 7 is threadedly connected, the lower conductive column 10 at its bottom end can conductively contact the negative electrode end 102, thereby having a certain conductive connection effect. The lower conductive column 10 transfers electrical energy to the conductive contact piece 8, and thus the conductive contact piece 8 can be conductively connected to the outside world through the setting, ensuring the conductive use effect of the negative electrode of the battery;

[0039] The lower wrapping protection structure composed of the upper end cap 4, the lower threaded part 7, and the conductive contact piece 8 can meet the normal conductive use performance of the lithium battery while having a certain protection effect, and meet the normal use effect. Those skilled in the art can use the lithium battery of the present invention through conventional usage methods;

[0040] The soft package shell 2 provided by the present invention can perform external wrapping protection on the internal lithium battery body 1, effectively improving the protection effect of the internal lithium battery body and prolonging the service life of the lithium battery body 1;

[0041] At the same time, a buffer inner layer is provided inside the soft package shell 2, and a number of silica gel fillers 9 are filled inside the buffer inner layer. When the soft package shell 2 is subjected to external forces, such as dropping or bumping external force impacts, etc., the external force acting on the soft package shell 2 may cause the soft package shell 2 to produce an inward dent deformation. The external force effect of the dent deformation can act on the silica gel fillers 9, so as to resist and buffer the external force through the silica gel fillers 9, making the silica gel fillers 9 serve as the final force-bearing buffer structure, playing a certain inner layer buffer protection effect, avoiding the external force directly acting on the lithium battery body 1 through the soft package shell 2, thereby better protecting the internal lithium battery body 1 from external force impacts, preventing the lithium battery body 1 from deforming under force, and improving the overall protection performance and the service life of the battery.

[0042] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A polymer soft-pack cylindrical lithium battery, comprising a lithium battery body (1), characterized in that, The outside of the lithium battery body (1) is sleeved with a soft package shell (2). Inner grooves (3) are formed on the outer walls of the top end and the bottom end of the soft package shell (2). The inner grooves (3) are thread grooves. Between the upper and lower inner grooves (3) and inside the soft package shell (2) is a buffer inner layer, and a number of silica gel fillers (9) are filled in the buffer inner layer. The silica gel fillers (9) are elastic silica gel particles. The top end of the soft package shell (2) is provided with an upper end cap (4). A upper threaded part (6) is fixedly installed on the lower surface of the upper end cap (4). An upper thread part adapted to the upper inner groove (3) above is arranged outside the upper threaded part (6). A conductive contact (5) is fixedly installed on the top end of the upper end cap (4).

2. The polymer soft-pack cylindrical lithium battery according to claim 1, characterized in that: The bottom end of the soft package shell (2) is provided with a lower threaded part (7) adapted to the lower inner groove (3) below. A lower thread part is arranged on the outer surface of the lower threaded part (7).

3. A polymer soft-pack cylindrical lithium battery according to claim 2, characterized in that: A conductive contact piece (8) is fixedly installed at the bottom end of the lower threaded part (7). A lower conductive column (10) is fixedly installed at the center position of the upper surface of the conductive contact piece (8).

4. A polymer soft-pack cylindrical lithium battery according to claim 3, characterized in that: Both the conductive contact piece (8) and the lower conductive column (10) are made of conductive metal materials.

5. A polymer soft-pack cylindrical lithium battery according to claim 1, characterized in that: The thickness of the soft package shell (2) is between 1.5 - 2.3 mm, and the thickness of the buffer inner layer is between 1.3 - 2.1 mm.

6. A polymer soft-pack cylindrical lithium battery according to claim 1, characterized in that: The conductive contact (5) is a metal contact made of conductive metal.

7. A polymer soft-pack cylindrical lithium battery according to claim 1, characterized in that: A positive electrode end (101) is arranged at the top end of the lithium battery body (1), and a negative electrode end (102) is arranged at the bottom end of the lithium battery body (1).

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