A PCM protection plate integrated lithium battery

Abstract

The utility model relates to lithium battery technical field discloses a PCM protection board integrated formula lithium battery. The PCM protection board integrated formula lithium battery includes the casing of one end is open structure and the electric core encapsulated in the casing, and the open end between the one end of electric core and casing forms the empty cavity, is equipped with negative pole adapter in empty cavity, and negative pole adapter is hollow, and its top end outer diameter edge is welded in the open end of casing, and the PCM protection board is encapsulated in negative pole adapter, and PCM protection board adopts electric connection with electric core, and the top end of PCM protection board is installed P + pole post. Under the structure makes the battery and PCM protection board form an integrated structure, and the shape size has not changed, can cooperate the installation use of each big terminal product, simultaneously, need not from the PCM protection board to carry out the lead connection terminal product, makes this PCM protection board integrated formula lithium battery can quickly carry out the disassembly and installation on terminal product, satisfies the use requirement of various users.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a PCM protection board integrated lithium battery. Background Technology

[0002] Cylindrical lithium batteries are widely used in various end-use electronic products, such as toys, keyboards and mice, remote controls, and model airplanes. With the increasing maturity of lithium battery technology and its advantages such as high voltage, high capacity, fast charging, recyclability, and no memory effect, the common cylindrical lithium battery is the most prevalent. However, many batteries are used directly without protection measures, leading to numerous safety problems due to misuse. Therefore, the safety performance requirements for lithium batteries are becoming increasingly stringent both domestically and internationally.

[0003] In existing technologies, to ensure safe use of cylindrical lithium batteries, a PCM protection board is typically installed on the outside of the lithium battery. The dimensions of cylindrical lithium batteries have been standardized. Since the protection board has a specific shape and occupies space, installing it on the outside of the battery would significantly alter the shape and size of the entire battery module, reducing its applicability to end products. Furthermore, existing technologies using external protection boards for cylindrical lithium batteries involve connecting leads from the P+ and P- output terminals on the protection board to the end product via soldering. This complex assembly process makes it impossible for ordinary users to disassemble and replace the battery on the end product.

[0004] Therefore, there is an urgent need for a lithium battery with an integrated PCM protection board to solve the above problems. Utility Model Content

[0005] Based on the above, the purpose of this utility model is to provide a PCM protection board integrated lithium battery to solve the problems of poor applicability of cylindrical lithium batteries with external protection boards in the prior art and the inability of ordinary users to disassemble and replace the battery on the terminal product.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] The present invention provides a PCM protection board integrated lithium battery including a shell with an open end and a battery cell encapsulated in the shell, wherein an air-proof cavity is formed between one end of the battery cell and the open end of the shell.

[0008] The cavity is equipped with a negative electrode adapter, which is hollow and has its top outer diameter edge welded to the open end of the shell.

[0009] The negative electrode adapter contains a PCM protection board, which is electrically connected to the battery cell. A P+ terminal is installed on the top of the PCM protection board.

[0010] As an optional technical solution for a PCM protection board integrated lithium battery, the bottom outer diameter edge of the negative electrode adapter extends towards its axis with a first extension portion, and the top outer diameter edge extends outward with a second extension portion. The negative electrode adapter is welded to the open end of the housing through the second extension portion.

[0011] As an optional technical solution for a PCM protection board integrated lithium battery, the top surface of the first extension is provided with a hot melt adhesive layer and a positive electrode cover plate. The bottom of the hot melt adhesive layer and the negative electrode adapter are provided with a coaxial central hole. The bottom of the positive electrode cover plate is provided with a connecting post. The free end of the connecting post passes through the central hole and is connected to the positive electrode tab of the cell. The diameter of the central hole is larger than the diameter of the connecting post.

[0012] As an optional technical solution for a PCM protection board integrated lithium battery, a positive electrode adapter piece is welded to the upper surface of the positive electrode cover plate, and the B+ terminal of the PCM protection board is electrically connected to the positive electrode cover plate through the positive electrode adapter piece.

[0013] As an optional technical solution for a PCM protection board integrated lithium battery, the inner wall of the negative electrode adapter is provided with a limiting step, and the PCM protection board is installed on the limiting step.

[0014] As an optional technical solution for a PCM protection board integrated lithium battery, an upper insulating sheet is provided between the first extension and the cell, and a lower insulating sheet is provided between the bottom of the cell and the casing.

[0015] The beneficial effects of this utility model are as follows:

[0016] This utility model provides an integrated lithium battery with a PCM protection board, comprising a shell with an open end and a battery cell encapsulated within the shell. A cavity is formed between one end of the battery cell and the open end of the shell. A negative electrode adapter is provided within the cavity. The negative electrode adapter is hollow, and its top outer diameter edge is welded to the open end of the shell. A PCM protection board is encapsulated within the negative electrode adapter. The PCM protection board is electrically connected to the battery cell, and a P+ terminal is installed at the top of the PCM protection board.

[0017] In the above structure, the PCM protection board integrated lithium battery integrates a negative electrode adapter embedded in the cavity of the casing and welded to the open end of the casing. The PCM protection board is installed in the negative electrode adapter, so that the P- and B- terminals on the PCM protection board are electrically connected to the negative electrode adapter to form a negative electrode circuit, and the P+ and B+ terminals are electrically connected to the positive electrode tab of the cell to form a positive electrode circuit. A P+ terminal is also installed on the PCM protection board. Thus, the battery and the PCM protection board form an integrated structure, ensuring that the shape and size of the PCM protection board integrated lithium battery do not change, and it can be used in various terminal products. On the other hand, the negative electrode output terminal of the PCM protection board integrated lithium battery remains on the casing, while the P+ terminal is the positive electrode output terminal. That is to say, the position of the positive and negative electrode output terminals is not changed, and there is no need to connect the terminal product with a lead from the PCM protection board. This allows the battery package to be quickly disassembled and installed on the terminal product, meeting the usage requirements of various users. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the integrated lithium battery with PCM protection board in this embodiment of the present invention.

[0019] Figure 2 This is an exploded view of the integrated lithium battery with PCM protection board in an embodiment of this utility model.

[0020] Figure 3 This is a cross-sectional schematic diagram of the casing and battery cell in an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram of the negative electrode adapter in an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the positive electrode cover plate in an embodiment of this utility model.

[0023] In the picture:

[0024] 1. Housing; 10. Battery cell; 11. Upper insulating sheet; 12. Air-proof cavity;

[0025] 2. Negative electrode adapter; 20. First extension; 21. Second extension; 22. Limiting step; 23. Center hole; 24. Hot melt adhesive layer; 25. Positive electrode cover plate; 251. Connecting post; 26. Positive electrode adapter piece;

[0026] 3. PCM protection board; 30. P+ pole. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0032] Cylindrical lithium batteries are widely used in various end-use electronic products, such as toys, keyboards and mice, remote controls, and model airplanes. With the increasing maturity of lithium battery technology and its advantages such as high voltage, high capacity, fast charging, recyclability, and no memory effect, the common cylindrical lithium battery is the most prevalent. However, many batteries are used directly without protection measures, leading to numerous safety problems due to misuse. Therefore, the safety performance requirements for lithium batteries are becoming increasingly stringent both domestically and internationally.

[0033] EU Battery Regulation (EU) 2023 / 1542: This regulation requires that from 18 February 2027, all batteries for portable electronic products (such as mobile phones and tablets) placed on the EU market must meet the following conditions: 1. Removability: The battery must be able to be safely removed by the end user or professional without damaging the device, and only commercially available tools (such as screwdrivers) are permitted. 2. Replaceability: Compatible batteries must ensure that the device's functionality, performance and safety are not affected, and the software must not restrict the use of third-party batteries. Cylindrical steel-cased batteries are perfectly suitable for removable designs, but require an external PCM protection board. The dimensions of cylindrical lithium batteries are already standardized, and because the protection board has a specific shape and occupies space, installing it externally would significantly alter the shape and size of the entire battery package, reducing its applicability to end products. Furthermore, in existing technologies, cylindrical lithium batteries with external protection boards are electrically connected to end products via leads from the P+ and P- output terminals on the protection board, a complex assembly process that prevents ordinary users from easily disassembling and replacing the battery package. To address these technical problems, this invention provides the following technical solution.

[0034] like Figure 1-5 As shown, this utility model provides a PCM protection board integrated lithium battery, which includes a shell 1 with an open end and a cell 10 encapsulated in the shell 1. A cavity 12 is formed between one end of the cell 10 and the open end of the shell 1. A negative electrode adapter 2 is provided in the cavity 12. The negative electrode adapter 2 is hollow and its top outer diameter edge is welded to the open end of the shell 1. A PCM protection board 3 is encapsulated in the negative electrode adapter 2. The PCM protection board 3 is electrically connected to the cell 10. A P+ terminal 30 is installed on the top of the PCM protection board 3.

[0035] The integrated lithium battery with PCM protection board provided by this utility model integrates the negative electrode adapter 2 into the cavity 12 of the housing 1 and welds it to the open end of the housing 1. The PCM protection board 3 is installed in the negative electrode adapter 2, so that the P- and B- terminals on the PCM protection board 3 are electrically connected to the negative electrode adapter 2 to form a negative electrode circuit, and the P+ and B+ terminals are electrically connected to the positive electrode tab of the cell 10 to form a positive electrode circuit. A P+ terminal 30 is installed on the PCM protection board 3. Thus, the battery and the PCM protection board 3 form an integrated circuit. The integrated structure ensures that the shape and size of the integrated lithium battery with the PCM protection board remain unchanged, allowing it to be used in various terminal products. On the other hand, the negative output terminal of the integrated lithium battery with the PCM protection board remains on the housing 1, while the P+ terminal 30 is the positive output terminal. In other words, the positions of the positive and negative output terminals have not been changed, eliminating the need for lead wires from the PCM protection board 3 to connect to the terminal product. This allows the battery package to be quickly disassembled and installed on the terminal product, meeting the usage requirements of various users.

[0036] Specifically, such as Figure 4 As shown, the bottom outer diameter edge of the negative electrode adapter 2 extends towards its axis to form a first extension 20, and the top outer diameter edge extends outward to form a second extension 21. The edge of the second extension 21 is welded to the open end of the housing 1 to fix the negative electrode adapter 2 to the housing 1, so that the negative electrode adapter 2 and the housing 1 form a negative electrode circuit. The first extension 20, the second extension 21 and the negative electrode adapter 2 are integrally formed, ensuring the stability of the negative electrode adapter 2. In the above structure, the PCM protection board 3 is embedded in the negative electrode adapter 2, so that the end face of the PCM protection board 3 is flush with the port of the negative electrode adapter 2, forming an integrated structure. Therefore, without changing the shape and size of the lithium battery, it can be used in conjunction with the installation of various terminal products, improving its applicability.

[0037] Furthermore, such as Figure 2 and Figure 4As shown, a limiting step 22 is provided on the top inner wall of the negative electrode adapter 2. The PCM protection board is installed on the limiting step 22. In this structure, the PCM protection board 3 is embedded in the negative electrode adapter 2 and limited by the limiting step 22, which effectively prevents the PCM protection board 3 from shaking and improves the stability of the PCM protection board 3 in the negative electrode adapter 2. The P- and B- ends of the PCM protection board 3 are set at the outer diameter edge of the PCM protection board 3, and the outer diameter edge of the PCM protection board 3 is welded and fixed to the negative electrode adapter 2 by soldering or other welding methods, so that it can be electrically connected to the negative electrode adapter 2 without the need for lead wire connection, forming an integrated negative electrode circuit. It should be noted that in this embodiment, the negative electrode tab of the cell 10 is welded to the bottom of the shell 1, and the entire battery can be wrapped and encapsulated with insulating material to improve the insulation and aesthetics of the battery.

[0038] In this embodiment, as Figure 2 and Figure 5 As shown, the top surface of the first extension 20 is provided with a hot melt adhesive layer 24 and a positive electrode cover plate 25. The bottom of the hot melt adhesive layer 24 and the negative electrode adapter 2 are provided with a coaxial center hole 23. The bottom of the positive electrode cover plate 25 is provided with a connecting post 251 integrally formed with the positive electrode cover plate 25. The free end of the connecting post 251 passes through the center hole 23 and is connected to the positive electrode tab of the battery cell 10. The diameter of the center hole 23 is larger than the diameter of the connecting post 251, which prevents the connecting post 251 and the first extension 20 from touching and causing a short circuit, thereby improving the safety and service life of the battery.

[0039] The hot melt adhesive layer 24 is made of materials including, but not limited to, electrolyte-resistant hot melt adhesive, modified acrylic adhesive, modified epoxy resin adhesive, modified polyurethane adhesive, and modified PP hot melt adhesive. In this embodiment, the material of the hot melt adhesive layer 24 is preferably modified PP hot melt adhesive. The failure temperature of modified PP hot melt adhesive is 115±5℃. Therefore, when the battery experiences an abnormal short circuit or thermal abuse, the battery temperature rises before the pressure is released. When the temperature exceeds 115℃, the adhesive strength of the modified PP hot melt adhesive weakens, and it peels off from the composite surface of the first extension 20 and the positive electrode cover 25, forming a pressure relief channel caused by overheating, thus releasing pressure in advance and improving battery safety. On the other hand, an upper insulating sheet 11 and a lower insulating sheet are respectively provided between the first extension 20 and the cell 10, and between the bottom of the cell 10 and the casing 1, to prevent the risk of short circuit between the positive and negative electrodes of the cell 10, further improving the safety and stability of the battery.

[0040] Furthermore, a positive electrode adapter 26 is welded to the upper surface of the positive electrode cover plate 25. The positive electrode adapter 26 is "L" shaped, and its top end is welded to the B+ terminal of the PCM protection board 3. That is to say, the B+ terminal of the PCM protection board 3 is electrically connected to the positive electrode cover plate 25 through the positive electrode adapter 26. A P+ terminal 30 is installed at the P+ terminal at the top of the PCM protection board 3, so that an integrated positive output circuit is formed between the P+ terminal 30 and the cell 10. Therefore, in this PCM protection board integrated lithium battery, the P+ terminal 30 and the P- terminal of the PCM protection board 3 form an integrated circuit with the battery, and maintain a universal standard shape and size. There is no need to connect the terminal product with leads through the PCM protection board 3, which makes the battery convenient to use and can be quickly disassembled and replaced from the terminal product, improving its applicability and meeting the application requirements of batteries with protection boards at home and abroad.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A lithium battery with an integrated PCM protection board, characterized in that, include: A housing with one open end and a battery cell encapsulated inside the housing, wherein a cavity is formed between one end of the battery cell and the open end of the housing; The cavity is equipped with a negative electrode adapter, which is hollow and has its top outer diameter edge welded to the open end of the shell. The negative electrode adapter contains a PCM protection board, which is electrically connected to the battery cell. A P+ terminal is installed on the top of the PCM protection board.

2. The PCM protection board integrated lithium battery according to claim 1, characterized in that, The negative electrode adapter has a first extension extending from its bottom outer diameter edge toward its axis, and a second extension extending from its top outer diameter edge. The negative electrode adapter is welded to the open end of the housing through the second extension.

3. The PCM protection board integrated lithium battery according to claim 2, characterized in that, The top surface of the first extension is provided with a hot melt adhesive layer and a positive electrode cover plate. The bottom of the hot melt adhesive layer and the negative electrode adapter are provided with a coaxial central hole. The bottom of the positive electrode cover plate is provided with a connecting post. The free end of the connecting post passes through the central hole and is connected to the positive electrode tab of the battery cell. The diameter of the central hole is larger than the diameter of the connecting post.

4. The PCM protection board integrated lithium battery according to claim 3, characterized in that, A positive electrode adapter piece is welded to the upper end face of the positive electrode cover plate, and the B+ terminal of the PCM protection board is electrically connected to the positive electrode cover plate through the positive electrode adapter piece.

5. A PCM protection board integrated lithium battery according to claim 4, characterized in that, The inner wall of the negative electrode adapter is provided with a limiting step, and the PCM protection plate is installed on the limiting step.

6. The PCM protection board integrated lithium battery according to claim 5, characterized in that, An upper insulating sheet is provided between the first extension and the battery cell, and a lower insulating sheet is provided between the bottom of the battery cell and the housing.

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