High-voltage polymer lithium battery
By adjusting the core structure and connection method in the lithium battery pack, a high voltage of 7.4V lithium battery design is achieved, which solves the problems of low cell voltage and difficult combination, improves the performance and energy density of the battery pack, and reduces the Production cost.
Patent Information
- Application Number
- CN202420104439.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-16
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-01-16
AI Technical Summary
The voltage of the existing lithium battery cell is low, resulting in large heat generation and serious power loss. The external circuit and shell need to be added when combined, resulting in a decrease in energy density, and the isolation between the single battery cells is difficult to control consistency, and the lack of 4V The above products.
Design a high voltage polymer lithium battery. By adjusting the core structure inside the battery pack, connecting two cores in series, connecting them in parallel, using nickel metal belts, fixed connection between insulating layer and energy storage core, achieving a 7.4V voltage, simplifying the structure and reduce costs.
It effectively solves the problems of battery cell consistency and cost, improves the performance and energy density of the battery pack, simplifies combined operations, and reduces production costs.
Smart Images
Figure CN222233697U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a high-voltage polymer lithium battery. Background Art
[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. In 1912, lithium metal batteries were first proposed and studied by Gilbert N. Lewis. In the 1970s, MS Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become mainstream.
[0003] Due to the limitations of the chemical system, the voltage of single cells is currently mostly below 5V. The low voltage results in a larger current output at the same power, and the heat generated by the cell is Q=I2Rt. Low-voltage cells are more likely to generate heat due to the large current, which leads to large power loss. When combined, the energy density of the cell combination is greatly reduced due to the need to add external lines to connect the cells and the need for additional casing. At the same time, each single cell is in a completely isolated space, and its consistency is difficult to control. There are almost no lithium battery products above 4V, and existing products need to be redesigned and upgraded. Utility Model Content
[0004] The purpose of the utility model is to provide a high-voltage polymer lithium battery. The problem to be solved by the utility model is to provide a structural design and operation method of a soft-pack monomer high-voltage polymer lithium battery with a simple and reasonable structure and reduced cost, so as to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-voltage polymer lithium battery, comprising a battery body, one end of the battery body is fixedly connected to a protective shell, the interior of the protective shell is hollow, the top inner wall of the battery body is fixedly connected to a first winding core, the inner wall of the battery body located at the bottom end of the first winding core is fixedly connected to a second winding core, the end of the first winding core away from the protective shell is fixedly connected to a first positive electrode, the side wall of the second winding core close to the bottom end of the first positive electrode is fixedly connected to a first negative electrode, the side wall of the first winding core close to one end of the protective shell is fixedly connected to a second negative electrode, the side wall of the second winding core close to one end of the protective shell is fixedly connected to a second positive electrode, and the top and bottom of the second negative electrode and the second positive electrode are commonly fixedly connected to a nickel metal strip connecting strip.
[0006] As a further solution of the utility model: the first positive electrode, the first negative electrode, the second negative electrode and the second positive electrode have their ends away from the first winding core and the second winding core respectively all penetrate through the battery body and are fixedly connected.
[0007] As a further solution of the utility model: the second negative electrode, the second positive electrode and the nickel metal strip connecting strip are all arranged inside the protective shell.
[0008] As a further solution of the utility model: the interior of the first winding core is hollow, the inner wall of the first winding core is fixedly connected to the first insulating layer, and the first winding core is located inside the inner wall of the first insulating layer and is fixedly connected to the first energy storage core.
[0009] As a further solution of the utility model: the first positive electrode and the second negative electrode respectively pass through one end of the first winding core and are fixedly connected inside the first energy storage core.
[0010] As a further solution of the utility model: the interior of the second winding core is hollow, the inner wall of the second winding core is fixedly connected to the second insulating layer, and the second energy storage core is fixedly connected to the inner wall of the second insulating layer of the second winding core.
[0011] As a further solution of the utility model: the first negative electrode and the second positive electrode respectively pass through one end of the second winding core and are fixedly connected to the inside of the second energy storage core.
[0012] Compared with the prior art, the utility model has the following beneficial effects: the problem to be solved by the utility model is to provide a structural design and operation method of a soft-packed single 7.4V polymer lithium battery with a simple and reasonable structure and reduced cost. Thus, the disadvantages of consuming a lot of manpower and material resources for matching the consistency of items such as capacity, voltage, internal resistance, and subsequent PACK combination operations are well solved. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the main structure of a high-voltage polymer lithium battery of the utility model;
[0014] Figure 2 It is a schematic diagram of the structure of a first winding core and a second winding core in a high-voltage polymer lithium battery of the utility model;
[0015] Figure 3 This utility model is a high voltage polymer lithium battery Figure 2 A schematic diagram of the structure enlargement at the center A;
[0016] Figure 4 It is an enlarged schematic diagram of the cross-sectional structure of a first winding core and a second winding core in a high-voltage polymer lithium battery of the utility model;
[0017] Figure 5 It is a schematic diagram of the enlarged structure of B in a high voltage polymer lithium battery 4 of the utility model.
[0018] In the figure: 1. Battery body; 2. Protective shell; 3. First positive electrode; 4. First negative electrode; 5. First winding core; 6. Second winding core; 7. Second negative electrode; 8. Second positive electrode; 9. Nickel metal strip connecting strip; 10. First energy storage core; 11. Second energy storage core; 12. First insulating layer; 13. Second insulating layer. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0020] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.
[0021] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position 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.
[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0023] See also Figures 1 to 5In an embodiment of the utility model, a high-voltage polymer lithium battery includes a battery body 1, one end of the battery body 1 is fixedly connected to a protective shell 2, the interior of the protective shell 2 is hollow, a first winding core 5 is fixedly connected to the inner wall of the top of the battery body 1, and a second winding core 6 is fixedly connected to the inner wall of the battery body 1 at the bottom end of the first winding core 5, an end of the first winding core 5 away from the protective shell 2 is fixedly connected to a first positive electrode 3, a side wall of the second winding core 6 close to the bottom end of the first positive electrode 3 is fixedly connected to a first negative electrode 4, a side wall of the first winding core 5 close to one end of the protective shell 2 is fixedly connected to a second negative electrode 7, a side wall of the second winding core 6 close to one end of the protective shell 2 is fixedly connected to a second positive electrode 8, and the top and bottom of the second negative electrode 7 and the second positive electrode 8 are fixedly connected to a nickel metal strip connecting strip 9.
[0024] The utility model only makes adjustments to the roll core structure inside the battery pack, and the rest of the structure and production process are consistent with conventional polymer soft-pack lithium batteries;
[0025] The structure of the utility model is as follows: more than two winding cores are connected in series inside each battery pack (two in this example, and the same applies to multiple structures), and one pole is provided at the upper and lower ends of the winding core; one has a positive pole at the upper end and a negative pole at the lower end; one has a negative pole at the upper end and a positive pole at the lower end; then the two winding cores are connected in series by ultrasonic welding using a nickel metal strip (the two poles at the bottom are ultrasonically welded together using a nickel metal strip); finally, the two winding cores connected in series are overlapped and combined together in parallel, and the metal strips connected at the bottom are all covered with insulating tape; in this way, the winding core of the structural design is ready.
[0026] One end of the first positive electrode 3 , the first negative electrode 4 , the second negative electrode 7 and the second positive electrode 8 away from the first winding core 5 and the second winding core 6 respectively penetrates through the battery body 1 and is fixedly connected.
[0027] The second negative electrode 7 , the second positive electrode 8 and the nickel metal strip connecting strip 9 are all arranged inside the protective shell 2 .
[0028] The interior of the first winding core 5 is hollow, and the first insulating layer 12 is fixedly connected to the inner wall of the first winding core 5 . The first energy storage core 10 is fixedly connected to the inner wall of the first insulating layer 12 of the first winding core 5 .
[0029] The first positive electrode 3 and the second negative electrode 7 respectively pass through one end of the first winding core 5 and are fixedly connected inside the first energy storage core 10 .
[0030] The interior of the second winding core 6 is hollow, the inner wall of the second winding core 6 is fixedly connected to the second insulating layer 13 , and the second energy storage core 11 is fixedly connected to the inner wall of the second winding core 6 located at the inner wall of the second insulating layer 13 .
[0031] The first negative electrode 4 and the second positive electrode 8 respectively pass through one end of the second winding core 6 and are fixedly connected to the inside of the second energy storage core 11 .
[0032] The utility model mainly adjusts the winding core structure inside the battery pack to achieve the purpose of a nominal voltage of 7.4V for the single battery pack.
[0033] The original direction of the tabs of the internal winding core of the soft-pack polymer lithium battery in the industry is the same side ( Figure 3 ), the structure of the utility model is adjusted as follows: two winding cores are connected in series inside each battery pack, and a pole is output from the upper and lower ends of the winding core respectively; a positive pole is output from the upper end of one, and a negative pole is output from the lower end; a negative pole is output from the upper end of one, and a positive pole is output from the lower end; then a nickel metal strip is used to ultrasonically weld the two winding cores in series (the two poles at the bottom are ultrasonically welded together with a nickel metal strip), and finally the two winding cores in series are overlapped and combined together in parallel, and the metal strips connected at the bottom are all covered with insulating tape. In this way, the winding core of this structural design is ready, and the subsequent production process is the same as the previous single winding core process. Since the manufacturing batches, processes and times of the two winding cores are close, and they are in the same shell, the difference between the winding cores is very small, and the slight difference will be rebalanced during the shelving process. The performance of subsequent battery cells will also be improved compared to two monomers. Its specific structure is as follows Figure 2 shown.
[0034] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.
[0035] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.
Claims
1. A high voltage polymer lithium battery, comprising a battery body (1), characterized in that: One end of the battery body (1) is fixedly connected to a protective shell (2), the interior of the protective shell (2) is hollow, a first winding core (5) is fixedly connected to the inner wall at the top end of the battery body (1), a second winding core (6) is fixedly connected to the inner wall of the battery body (1) at the bottom end of the first winding core (5), an end of the first winding core (5) away from the protective shell (2) is fixedly connected to a first positive electrode (3), a side wall of the second winding core (6) close to the bottom end of the first positive electrode (3) is fixedly connected to a first negative electrode (4), a side wall of the first winding core (5) close to one end of the protective shell (2) is fixedly connected to a second negative electrode (7), a side wall of the second winding core (6) close to one end of the protective shell (2) is fixedly connected to a second positive electrode (8), and the top and bottom of the second negative electrode (7) and the second positive electrode (8) are fixedly connected to a nickel metal strip connecting strip (9).
2. A high voltage polymer lithium battery according to claim 1, characterized in that: One end of the first positive electrode (3), the first negative electrode (4), the second negative electrode (7) and the second positive electrode (8) which are respectively away from the first winding core (5) and the second winding core (6) are all penetrated and fixedly connected to the battery body (1).
3. A high voltage polymer lithium battery according to claim 1, characterized in that: The second negative electrode (7), the second positive electrode (8) and the nickel metal strip connecting strip (9) are all arranged inside the protective shell (2).
4. A high voltage polymer lithium battery according to claim 1, characterized in that: The interior of the first winding core (5) is hollow, the inner wall of the first winding core (5) is fixedly connected to a first insulating layer (12), and the first winding core (5) is located inside the inner wall of the first insulating layer (12) and is fixedly connected to a first energy storage core (10).
5. The high voltage polymer lithium battery according to claim 1, characterized in that: The first positive electrode (3) and the second negative electrode (7) respectively pass through one end of the first winding core (5) and are fixedly connected inside the first energy storage core (10).
6. A high voltage polymer lithium battery according to claim 1, characterized in that: The interior of the second winding core (6) is hollow, the inner wall of the second winding core (6) is fixedly connected to the second insulating layer (13), and the second winding core (6) is located inside the inner wall of the second insulating layer (13) and is fixedly connected to the second energy storage core (11).
7. A high voltage polymer lithium battery according to claim 1, characterized in that: The first negative electrode (4) and the second positive electrode (8) respectively pass through one end of the second winding core (6) and are fixedly connected to the inside of the second energy storage core (11).