Polymer lithium battery

Abstract

The utility model relates to a polymer lithium battery which comprises a battery body, the front end of the battery body extends to form a positive tab and a negative tab, a circuit board is arranged at the front end of the battery body, and the positive tab and the negative tab are electrically connected with the circuit board. The first control chip U1, the first double-MOS tube, the second control chip U2 and the second double-MOS tube are sequentially arranged on the front end face of the circuit board at intervals from left to right, the resistor R1 and the capacitor C1 are arranged on the left side of the first control chip U1, the resistor R2 is located between the first control chip U1 and the first double-MOS tube, the resistor R4 is located between the second control chip U2 and the second double-MOS tube, and the capacitor C1 is arranged on the right side of the first control chip U1. And the resistor R3 and the capacitor C2 are arranged on the right side of the second control chip U2. Dual protection is achieved, the service life of a battery is prolonged, the heat dissipation performance of all electronic elements is improved, meanwhile, the available space of the front elements is increased, and convenient maintenance of the elements is achieved on the overall layout structure.

Description

Technical Field

[0001] This utility model relates to the field of polymer lithium battery technology, and in particular to a polymer lithium battery. Background Technology

[0002] With the rapid development of portable electronic products, lithium batteries are increasingly widely used due to their advantages of being lightweight, compact, and having high energy density. However, current lithium-ion batteries place stringent requirements on chargers and have high demands on protection circuits. To utilize the battery's capacity more effectively, it needs to be charged to its maximum voltage. However, overcharging can shorten the battery's lifespan and eventually damage it. When the lithium battery voltage is too low, it needs to be pre-charged. In addition to voltage detection, methods such as monitoring battery temperature and charging current can also be used to prevent overcharging, thus providing additional protection for lithium-ion batteries.

[0003] The key to the continued widespread application of lithium-ion batteries lies in achieving both safe and efficient charging control. With the proliferation of diverse portable electronic products and the rapid development of artificial intelligence and wearable devices, lithium-ion batteries are poised for increasingly widespread use in applications such as power banks, tablets, and 2-in-1 laptops. For these electronic products, lithium batteries are typically an indispensable component. Therefore, the market potential for lithium battery charging chips is enormous. Researching a lithium battery with high charging accuracy, fast charging speed, and excellent charging performance is beneficial to the development of my country's next generation of electronic information products.

[0004] Existing lithium batteries generally consist of a battery body and a circuit board. The positive and negative tabs of the battery body are usually soldered to the circuit board, which makes assembly cumbersome. Furthermore, existing circuit boards have components on both sides, which not only makes soldering and wiring inconvenient but also affects subsequent maintenance of the components.

[0005] Therefore, in this utility model patent application, the applicant has carefully researched a polymer lithium battery to solve the above problems. Utility Model Content

[0006] This utility model addresses the shortcomings of the existing technology by providing a polymer lithium battery that offers dual protection, extends battery life, improves heat dissipation of all electronic components, increases the available space for front-end components, and facilitates convenient maintenance of the devices in the overall layout structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A polymer lithium battery includes a battery body, with a positive electrode tab and a negative electrode tab extending from the front end of the battery body, and a circuit board provided at the front end of the battery body, wherein the positive electrode tab and the negative electrode tab are electrically connected to the circuit board.

[0009] The circuit board is provided with a positive power supply output terminal, a negative power supply output terminal, and a first protection branch and a second protection branch connected in series for supplying power to the receiving end. The positive and negative input terminals of the first protection branch are used to connect to the positive and negative tabs, respectively.

[0010] The positive output terminal of the second protection branch is the positive output terminal of the power supply, and the negative output terminal of the second protection branch is the negative output terminal of the power supply.

[0011] The first protection branch includes a resistor R1, a capacitor C1, a resistor R2, a first dual MOS transistor, and a first control chip U1;

[0012] The second protection branch includes resistor R3, capacitor C2, resistor R4, a second dual MOS transistor, and a second control chip U2;

[0013] The first control chip U1, the first dual MOSFET, the second control chip U2, and the second dual MOSFET are arranged sequentially from left to right on the front end of the circuit board. The resistor R1 and capacitor C1 are located to the left of the first control chip U1. The resistor R2 is located between the first control chip U1 and the first dual MOSFET. The resistor R4 is located between the second control chip U2 and the second dual MOSFET. The resistor R3 and capacitor C2 are located to the right of the second control chip U2.

[0014] As a preferred embodiment, one end of resistor R1 is used to connect to the positive terminal, and the other end of resistor R1 is connected to pin 5 of the first control chip U1. Pin 5 of the first control chip U1 is connected to pin 6 of the first control chip U1 through capacitor C1. Pin 6 of the first control chip U1 is used to connect to the negative terminal. Pin 1 of the first control chip U1 is connected to pin 6 of the first dual MOSFET. Pin 3 of the first control chip U1 is connected to pin 4 of the first dual MOSFET. Pin 3 of the first control chip U1 is connected to pin 3 of the first dual MOSFET through resistor R2. Pin 3 of the first dual MOSFET is connected to pin 1 of the second dual MOSFET.

[0015] One end of resistor R3 is the positive output terminal of the power supply. One end of resistor R3 is used to connect to the positive tab. The other end of resistor R3 is connected to pin 5 of the second control chip U2. Pin 5 of the second control chip U2 is connected to pin 6 of the second control chip U2 through capacitor C2. Pin 6 of the second control chip U2 and pin 1 of the second dual MOSFET are connected to pin 3 of the first dual MOSFET. Pin 1 of the second control chip U2 is connected to pin 6 of the second dual MOSFET. Pin 3 of the second control chip U2 is connected to pin 4 of the second dual MOSFET. Pin 3 of the second control chip U2 is connected to pin 3 of the second dual MOSFET through resistor R4. Pin 3 of the second dual MOSFET is the negative output terminal of the power supply.

[0016] As a preferred embodiment, a heat-conducting component is provided between the circuit board and the battery body.

[0017] As a preferred embodiment, the positive electrode and the negative electrode are detachably electrically connected to the circuit board.

[0018] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, it mainly achieves dual protection through the cooperation of the first protection circuit and the second protection circuit, which helps to extend the battery life. In particular, by arranging the first control chip U1, the first dual MOS transistor, the second control chip U2, and the second dual MOS transistor from left to right on the front surface of the circuit board, and coordinating the positions of resistor R3, capacitor C2, resistor R4, resistor R1, capacitor C1, and resistor R2, it is beneficial to improve the heat dissipation performance of all electronic components. At the same time, the space available for the front components is increased, and the overall layout structure enables convenient maintenance of the devices.

[0019] Secondly, the detachable electrical structure of the positive and negative tabs facilitates rapid assembly of the battery body and circuit board, improving assembly efficiency.

[0020] To more clearly illustrate the structural features and effects of the present invention, a detailed description is provided below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a top view schematic diagram of the circuit board according to an embodiment of the present utility model;

[0022] Figure 2 This is a front view of the battery body according to an embodiment of the present invention;

[0023] Figure 3 This is a partially enlarged structural schematic diagram of an embodiment of the present invention (showing no electrical connections).

[0024] Figure 4 This is a circuit schematic diagram of an embodiment of the present invention.

[0025] Explanation of icon numbers:

[0026] 10. Battery body

[0027] 11. Positive electrode ear 12. Negative electrode ear

[0028] 20. Circuit board

[0029] 21. Positive power supply output terminal 22. Negative power supply output terminal

[0030] 23. First protection branch road; 24. Second protection branch road

[0031] 25. First conductive button 26. Second conductive button. Detailed Implementation

[0032] like Figures 1 to 4 As shown, a polymer lithium battery includes a battery body 10. A positive electrode tab 11 and a negative electrode tab 12 extend from the front end of the battery body 10. A circuit board 20 is disposed at the front end of the battery body 10, and the positive electrode tab 11 and the negative electrode tab 12 are electrically connected to the circuit board 20. A thermally conductive element is disposed between the circuit board 20 and the battery body 10. Preferably, the thermally conductive element is one of thermally conductive paste, thermally conductive adhesive, thermally conductive coating, or thermally conductive plastic.

[0033] The circuit board 20 is provided with a positive power output terminal 21, a negative power output terminal 22 for supplying power to the power receiving end, and a first protection branch 23 and a second protection branch 24 connected in series. The positive input terminal (B+ in the figure) and the negative input terminal (B- in the figure) of the first protection branch 23 are respectively used to connect the positive tab 11 and the negative tab 12.

[0034] In this embodiment, the positive electrode tab 11 and the negative electrode tab 12 are detachably electrically connected to the circuit board 20. Preferably, the rear end face of the circuit board 20 is provided with two first conductive buttons 25, and the positive electrode tab 11 and the negative electrode tab 12 are respectively provided with a second conductive button 26. The first conductive buttons 25 and the second conductive buttons 26 are fastened and connected electrically. The button-type electrical connection facilitates the electrical connection between the circuit board 20 and the battery body 10, avoids traditional soldering connections, and improves assembly efficiency.

[0035] The positive output terminal of the second protection branch 24 is the power supply positive output terminal 21, and the negative output terminal of the second protection branch 24 is the power supply negative output terminal 22.

[0036] The first protection branch 23 includes a resistor R1, a capacitor C1, a resistor R2, a first dual MOSFET Q1, and a first control chip U1;

[0037] The second protection branch 24 includes a resistor R3, a capacitor C2, a resistor R4, a second dual MOS transistor Q2, and a second control chip U2;

[0038] The first control chip U1, the first dual MOSFET Q1, the second control chip U2, and the second dual MOSFET Q2 are arranged sequentially from left to right on the front surface of the circuit board 20. The resistor R1 and capacitor C1 are located to the left of the first control chip U1. The resistor R2 is located between the first control chip U1 and the first dual MOSFET Q1. The resistor R4 is located between the second control chip U2 and the second dual MOSFET Q2. The resistor R3 and capacitor C2 are located to the right of the second control chip U2.

[0039] One end of resistor R1 is used to connect to the positive terminal 11, and the other end of resistor R1 is connected to pin 5 of the first control chip U1. Pin 5 of the first control chip U1 is connected to pin 6 of the first control chip U1 through capacitor C1. Pin 6 of the first control chip U1 is used to connect to the negative terminal 12. Pin 1 of the first control chip U1 is connected to pin 6 of the first dual MOSFET Q1. Pin 3 of the first control chip U1 is connected to pin 4 of the first dual MOSFET Q1. Pin 3 of the first control chip U1 is connected to pin 3 of the first dual MOSFET Q1 through resistor R2. Pin 3 of the first dual MOSFET Q1 is connected to pin 1 of the second dual MOSFET Q2.

[0040] One end of resistor R3 is the positive output terminal 21, and the other end of resistor R3 is connected to the positive tab 11. The other end of resistor R3 is connected to pin 5 of the second control chip U2. Pin 5 of the second control chip U2 is connected to pin 6 of the second control chip U2 through capacitor C2. Pin 6 of the second control chip U2 and pin 1 of the second dual MOSFET Q2 are connected to pin 3 of the first dual MOSFET Q1. Pin 1 of the second control chip U2 is connected to pin 6 of the second dual MOSFET Q2. Pin 3 of the second control chip U2 is connected to pin 4 of the second dual MOSFET Q2. Pin 3 of the second control chip U2 is connected to pin 3 of the second dual MOSFET Q2 through resistor R4. Pin 3 of the second dual MOSFET Q2 is the negative output terminal 22.

[0041] The key design feature of this utility model is that it achieves dual protection through the cooperation of the first protection circuit and the second protection circuit, which helps to extend the battery's service life. In particular, by arranging the first control chip U1, the first dual MOSFET, the second control chip U2, and the second dual MOSFET from left to right on the front surface of the circuit board, and coordinating the positions of resistor R3, capacitor C2, resistor R4, resistor R1, capacitor C1, and resistor R2, it is beneficial to improve the heat dissipation performance of all electronic components. At the same time, the space available for the front components is increased, and the overall layout structure enables convenient maintenance of the components.

[0042] Secondly, the detachable electrical structure of the positive and negative tabs facilitates rapid assembly of the battery body and circuit board, improving assembly efficiency.

[0043] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A polymer lithium battery, comprising a battery body, wherein a positive electrode tab and a negative electrode tab extend from the front end of the battery body, and a circuit board is disposed at the front end of the battery body, wherein the positive electrode tab and the negative electrode tab are electrically connected to the circuit board, characterized in that: The circuit board is provided with a positive power supply output terminal, a negative power supply output terminal, and a first protection branch and a second protection branch connected in series for supplying power to the receiving end. The positive and negative input terminals of the first protection branch are used to connect to the positive and negative tabs, respectively. The positive output terminal of the second protection branch is the positive output terminal of the power supply, and the negative output terminal of the second protection branch is the negative output terminal of the power supply. The first protection branch includes a resistor R1, a capacitor C1, a resistor R2, a first dual MOS transistor, and a first control chip U1; The second protection branch includes resistor R3, capacitor C2, resistor R4, a second dual MOS transistor, and a second control chip U2; The first control chip U1, the first dual MOSFET, the second control chip U2, and the second dual MOSFET are arranged sequentially from left to right on the front end of the circuit board. The resistor R1 and capacitor C1 are located to the left of the first control chip U1. The resistor R2 is located between the first control chip U1 and the first dual MOSFET. The resistor R4 is located between the second control chip U2 and the second dual MOSFET. The resistor R3 and capacitor C2 are located to the right of the second control chip U2.

2. The polymer lithium battery according to claim 1, characterized in that: One end of resistor R1 is used to connect to the positive terminal, and the other end of resistor R1 is connected to pin 5 of the first control chip U1. Pin 5 of the first control chip U1 is connected to pin 6 of the first control chip U1 through capacitor C1. Pin 6 of the first control chip U1 is used to connect to the negative terminal. Pin 1 of the first control chip U1 is connected to pin 6 of the first dual MOSFET. Pin 3 of the first control chip U1 is connected to pin 4 of the first dual MOSFET. Pin 3 of the first control chip U1 is connected to pin 3 of the first dual MOSFET through resistor R2. Pin 3 of the first dual MOSFET is connected to pin 1 of the second dual MOSFET. One end of resistor R3 is the positive output terminal of the power supply. One end of resistor R3 is used to connect to the positive tab. The other end of resistor R3 is connected to pin 5 of the second control chip U2. Pin 5 of the second control chip U2 is connected to pin 6 of the second control chip U2 through capacitor C2. Pin 6 of the second control chip U2 and pin 1 of the second dual MOSFET are connected to pin 3 of the first dual MOSFET. Pin 1 of the second control chip U2 is connected to pin 6 of the second dual MOSFET. Pin 3 of the second control chip U2 is connected to pin 4 of the second dual MOSFET. Pin 3 of the second control chip U2 is connected to pin 3 of the second dual MOSFET through resistor R4. Pin 3 of the second dual MOSFET is the negative output terminal of the power supply.

3. The polymer lithium battery according to claim 1, characterized in that: A heat-conducting component is provided between the circuit board and the battery body.

4. The polymer lithium battery according to claim 1, characterized in that: The positive electrode and the negative electrode are detachably electrically connected to the circuit board.

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