Rechargeable lithium battery capable of simplifying production
The modular design of the charge and discharge control module with the battery shell simplifies production, reduces costs, and enables automated assembly of rechargeable batteries.
Patent Information
- Application Number
- CN202422199944.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-07
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-07
AI Technical Summary
The core production and battery assembly processes of existing energy storage batteries are complex, resulting in high production costs and inability to achieve automated production.
The charge and discharge control module, PCBA board, positive electrode cap and positive electrode column are modularized into one whole, assembled and molded with the conductive shell, and used interference fit sealing to achieve modular assembly and integrated production.
The production process is simplified, assembly efficiency is improved, production costs are reduced, and the automated production of batteries is realized.
Smart Images
Figure CN223108942U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of new energy energy storage and application, and particularly relates to a rechargeable lithium battery which can simplify production. Background Art
[0002] Existing energy storage batteries are usually composed of a metal shell core or a soft package core plus other accessories such as a shell, a BMS protection board, etc. Among them, the production process of the core is relatively complex, usually including processes such as batching, coating, double-roll, slitting, sheet making, winding, shell insertion, top and side sealing (soft package), liquid injection, pre-sealing, forming, secondary sealing, shaping, etc.; the battery assembly includes processes such as PCBA mounting on a plastic shell, welding a positive cap, welding the core, mounting a metal shell, dispensing, pressing, etc. The production processes of the core and the battery PACK are numerous, the production costs are relatively high, and the quality cannot be fully controlled. Moreover, the production of the core and the battery assembly are two separate processes. It is necessary to first complete the production of the core and then assemble the core as a separate component into the battery, and automated production of the battery cannot be achieved. Content of the Utility Model
[0003] In order to solve the above problems, the purpose of the utility model is to provide a rechargeable lithium battery which can simplify production, has simple production processes, can improve production efficiency, and save production costs.
[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows:
[0005] The utility model provides a rechargeable lithium battery which can simplify production, comprising:
[0006] A charge and discharge control module;
[0007] A core;
[0008] A conductive shell;
[0009] A first accommodation groove and a second accommodation groove are arranged in the conductive shell. The first accommodation groove is arranged above the second accommodation groove. The charge and discharge control module is arranged in the first accommodation groove, and the core is arranged in the second accommodation groove;
[0010] The charge and discharge control module comprises a module main body, a PCBA board, a positive cap, and a positive pole column. The PCBA board, the positive cap, and the positive pole column are integrally formed with the module main body. The positive cap and the positive pole column are both electrically connected to the PCBA board, and one end of the positive cap away from the PCBA board is exposed outside the conductive shell; a positive pole tab is arranged at the upper end of the core, and a negative pole tab is arranged at the lower end of the core. The positive pole tab is electrically connected to one end of the positive pole column away from the PCBA board, a negative pole part is arranged at the bottom of the conductive shell, and the negative pole tab is electrically connected to the negative pole part;
[0011] The charge and discharge control module further includes a gasket. The gasket is located on the top of the conductive housing, and the upper surface of the gasket is exposed outside the conductive housing and is electrically connected to the conductive housing.
[0012] In this application, the module body, the PCBA board, the positive electrode cap, and the positive electrode column are modularized into a whole to realize modular assembly, which can improve the assembly efficiency, simplify production, improve production efficiency, and save production costs.
[0013] Under normal circumstances, the positive electrode cap on the top of the module body serves as the positive electrode of the battery, and the negative electrode part at the bottom of the conductive housing serves as the negative electrode and is placed in the charging box for charging by heterogeneous contact; in this application, by setting a gasket on the top of the conductive housing and connecting it in a contact manner with the conductive housing, the gasket can be used as the negative electrode and the positive electrode cap as the positive electrode, with the negative electrode and the positive electrode at the same end, to achieve charging by co-terminal contact.
[0014] Further, the module body, the PCBA board, the positive electrode cap, and the positive electrode column are integrally injection-molded.
[0015] Further, an avoidance hole is provided in the middle of the gasket, the positive electrode cap passes through the avoidance hole and is exposed outside the conductive housing, and the gasket is electrically connected to the conductive housing and does not contact the positive electrode cap.
[0016] Further, the gasket is of an annular structure, the outer wall of the annular structure is electrically connected to the conductive housing, and there is no contact between the inner wall of the annular structure and the positive electrode cap.
[0017] Further, the gasket and the conductive housing are both electrically connected to the PCBA, so as to indirectly realize the electrical connection between the gasket and the conductive housing.
[0018] Further, the PCBA board is located above the module body, and the gasket is located above the PCBA board. In this application, electronic components and through holes are provided on the PCBA board. By setting the gasket above the PCBA board to cover the PCBA board, it can not only protect the electronic components thereon, but also prevent the PCBA board from leaking out, improving the aesthetics.
[0019] Further, pressure relief holes are provided on the module body and the PCBA board at corresponding positions, and the pressure relief holes are filled with plugging members. When a fault occurs in the battery and the pressure rises, the plugging member can be flushed open to open the pressure relief hole for pressure relief to ensure the safe use of the product; at the same time, when the plugging member is made of a light-transmitting material, the pressure relief hole on the PCBA board can also be used as a light-transmitting hole for the indicator light to achieve the light-transmitting function.
[0020] Further, a limiting surface is provided on the outer wall of the module body, and a limiting protrusion is provided on the inner wall of the first accommodating groove. The limiting protrusion is in interference fit with the limiting surface. In this way of interference fit, not only can the module body be fixed, but also the core can be sealed to prevent electrolyte leakage. In the traditional sealing method using a sealing ring, the sealing ring is made of rubber material and is prone to expansion when heated or pressed, which may accidentally squeeze out the plug in the pressure relief hole. In this application, the charge and discharge control module is forcibly pressed into the first accommodating groove by a caulking machine, and the sealing between the charge and discharge control module and the first accommodating groove is achieved through interference fit. The caulking method is fixed and will not expand when heated or pressed, thus preventing the plug in the pressure relief hole from being accidentally extruded.
[0021] Further, the limiting protrusion is located above the core, which can limit the core and prevent the core from falling out of the conductive housing.
[0022] Further, the limiting surface is a concave arc surface, and the limiting protrusion is an arc protrusion protruding toward the inside of the conductive housing. The arc surface is in interference fit with the arc protrusion.
[0023] Further, the core is a lithium battery core, and electrolyte is injected into the lithium battery core.
[0024] Further, the conductive housing is made of a metal housing.
[0025] Further, the assembly process of the battery in this application is as follows:
[0026] 1. The PCBA board, the positive cap, and the positive column are integrally injection-molded to form the charge and discharge control module;
[0027] 2. The lithium battery core is installed into the metal housing, and the negative electrode tab is resistance-welded to the negative electrode part provided at the bottom of the metal housing;
[0028] 3. A rolling groove is formed on the metal housing to form a limiting protrusion;
[0029] 4. The positive column of the charge and discharge control module is welded to the positive electrode tab on the lithium battery core by laser or ultrasonic or resistance welding;
[0030] 5. After steps such as dehumidifying the core, injecting liquid, and evacuating, the charge and discharge control module is pressed into the metal housing by a caulking machine, and the upper edge of the metal housing is caulked. The caulked upper edge is in contact connection with the gasket.
[0031] Further, the circuit principle of the battery in this application is as follows:
[0032] When connecting to an external circuit, there are two methods:
[0033] (1) The negative electrode tab is connected to the negative electrode part at the bottom of the metal shell, and the negative electrode part serves as the negative electrode of the battery; the positive electrode tab is connected to the positive electrode column on the PCBA, and the positive electrode cap is electrically connected to the PCBA, and the positive electrode cap serves as the positive electrode of the battery, with the positive and negative electrodes at the opposite ends.
[0034] (2) The negative electrode tab is connected to the negative electrode part at the bottom of the metal shell, the negative electrode part is connected to the metal shell, the metal shell PCBA is electrically connected, the PCBA is connected to the gasket, and the gasket serves as the negative electrode; the positive electrode tab is connected to the positive electrode column on the PCBA, the positive electrode cap is electrically connected to the PCBA, the positive electrode cap serves as the positive electrode of the battery, and the positive and negative electrodes are at the same end.
[0035] The closed-loop circuit inside the battery is: the negative electrode tab is connected to the negative electrode part at the bottom of the metal shell, the negative electrode part is connected to the metal shell, the metal shell PCBA is electrically connected, and the positive electrode tab is connected to the positive electrode column on the PCBA. Through the above connection, the PCBA and the core are closed to achieve the purpose of electrical performance connection, which can be used for the core formation process. When the battery is assembled, the core can be formed.
[0036] The advantages of the utility model are as follows, compared with the prior art: first, the utility model realizes assembly with the shell by modularizing the module body, PCBA board, positive electrode cap and positive electrode column into a whole, which can improve assembly efficiency; secondly, the core is first loaded into the shell, and then the electrolyte is injected, and then it cooperates with the charge and discharge control module to realize formation, which can realize the assembly and production integration of the core and realize the automated production of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] Figure 1 It is an axonometric diagram of a rechargeable lithium battery.
[0038] Figure 2 This is an exploded diagram of a rechargeable lithium battery.
[0039] Figure 3 It is a cross-sectional view of a rechargeable lithium battery.
[0040] Figure 4 It is a cross-sectional view of the charge and discharge control module.
[0041] It should be noted that: Figure 3 and Figure 4 The cutting position is different.
[0042] In the figure: 1. Charge and discharge control module; 11. Module body; 12. PCBA board; 13. Positive cap; 14. Positive column; 15. Gasket; 16. Pressure relief hole; 17. Sealing piece; 18. Limiting surface; 2. Winding core; 21. Positive pole ear; 22. Negative pole ear; 3. Conductive shell; 31. First accommodating groove; 32. Second accommodating groove; 33. Negative pole part; 34. Limiting protrusion. Specific Embodiments
[0043] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0044] To achieve the above objectives, the technical solution of the present utility model is as follows:
[0045] Refer to Figures 1 - 4 As shown, this embodiment provides a rechargeable lithium battery that can simplify production, including:
[0046] A charge and discharge control module 1;
[0047] A wound core 2;
[0048] A conductive housing 3;
[0049] A first receiving groove 31 and a second receiving groove 32 are provided in the conductive housing 3. The first receiving groove 31 is arranged above the second receiving groove 32. The charge and discharge control module 1 is arranged in the first receiving groove 31, and the wound core 2 is arranged in the second receiving groove 32;
[0050] The charge and discharge control module 1 includes a module body 11, a PCBA board 12, a positive electrode cap 13, and a positive electrode column 14. The PCBA board 12, the positive electrode cap 13, and the positive electrode column 14 are integrally formed with the module body 11. The positive electrode cap 13 and the positive electrode column 14 are both electrically connected to the PCBA board 12, and one end of the positive electrode cap 13 away from the PCBA board 12 is exposed outside the conductive housing 3; a positive electrode tab 21 is provided at the upper end of the wound core 2, and a negative electrode tab 22 is provided at the lower end. The positive electrode tab 21 is electrically connected to one end of the positive electrode column 14 away from the PCBA board 12, and a negative electrode part 33 is provided at the bottom of the conductive housing 3. The negative electrode tab 22 is electrically connected to the negative electrode part 33.
[0051] In this application, the module body 11, the PCBA board 12, the positive electrode cap 13, and the positive electrode column 14 are modularized into a whole, realizing modular assembly, which can improve the assembly efficiency, simplify production, improve production efficiency, and save production costs.
[0052] Furthermore, the module body 11, the PCBA board 12, the positive electrode cap 13, and the positive electrode column 14 are integrally injection molded.
[0053] Further, the charge and discharge control module 1 further includes a gasket 15 made of a conductive material. The gasket 15 is located at the top of the conductive housing 3 and the upper surface of the gasket 15 is exposed outside the conductive housing 3. An avoidance hole is provided in the middle of the gasket 15, and the positive electrode cap 13 passes through the avoidance hole and is exposed outside the conductive housing 3. The gasket 15 is electrically connected to the conductive housing 3 and is not in contact with the positive electrode cap 13. In this application, under normal circumstances, the positive electrode cap 13 at the top of the module body 11 serves as the positive electrode of the battery, and the negative electrode part 33 at the bottom of the conductive housing 3 serves as the negative electrode and is placed in the charging box for off-end contact charging. Moreover, by providing the gasket 15 at the top of the conductive housing 3 and connecting it in a contact manner with the conductive housing 3, the gasket 15 can be used as the negative electrode and the positive electrode cap 13 as the positive electrode, with the negative and positive electrodes at the same end, to achieve in-end contact charging.
[0054] Further, the gasket 15 has an annular structure. The outer wall of the annular structure is electrically connected to the conductive housing 3, and there is no contact between the inner wall of the annular structure and the positive electrode cap 13.
[0055] Further, both the gasket 15 and the conductive housing 3 are electrically connected to the PCBA, thereby indirectly realizing the electrical connection between the gasket 15 and the conductive housing 3.
[0056] Further, the PCBA board 12 is located above the module body 11, and the gasket 15 is located above the PCBA board 12. In this application, electronic components and through holes are provided on the PCBA board 12. By arranging the gasket 15 above the PCBA board 12 to cover the PCBA board 12, it can not only protect the electronic components thereon but also prevent the PCBA board 12 from being exposed, improving the aesthetics.
[0057] It should be noted that in this embodiment, the gasket can be made of a conductive material or an insulating material. When made of a conductive material, it can serve as the negative electrode during contact charging and is also used to shield and protect the PCBA board and beautify the appearance; when made of an insulating material, it is only used to shield and protect the PCBA board and beautify the appearance.
[0058] Further, pressure relief holes 16 corresponding in position are provided on the module body 11 and the PCBA board 12, and the pressure relief holes 16 are filled with a plugging member 17. When a fault occurs in the battery resulting in increased pressure, the plugging member 17 can be flushed open to open the pressure relief holes 16 for pressure relief to ensure the safe use of the product. At the same time, when the plugging member 17 is made of a light-transmitting material, the pressure relief holes 16 on the PCBA board 12 can also serve as light-transmitting holes for the indicator light to achieve the light-transmitting function.
[0059] Further, a limiting surface 18 is provided on the outer wall of the module body 11, and a limiting protrusion 34 is provided on the inner wall of the first accommodating groove 31. The limiting protrusion 34 is in interference fit with the limiting surface 18. In this way of interference fit, the module body 11 can be fixed and the core 2 can be sealed to prevent electrolyte leakage. In the traditional sealing method using a sealing ring, the sealing ring is made of rubber and is prone to expansion when heated or pressed, so that the plug 17 in the pressure relief hole 16 is easily extruded out by mistake. In this application, the charge-discharge control module 1 is forcibly pressed into the first accommodating groove 31 by a caulking machine, and the sealing between the charge-discharge control module 1 and the first accommodating groove 31 is achieved through interference fit. The caulking method is fixed and will not expand when heated or pressed, thus preventing the plug 17 in the pressure relief hole 16 from being extruded out by mistake.
[0060] Further, the limiting protrusion 34 is located above the core 2, which can limit the core 2 to prevent the core 2 from falling out of the conductive housing 3.
[0061] Further, the limiting surface 18 is a concave arc surface, and the limiting protrusion 34 is an arc protrusion protruding towards the inside of the conductive housing 3. The arc surface is in interference fit with the arc protrusion.
[0062] Further, the core 2 is a lithium battery core, and electrolyte is injected into the lithium battery core.
[0063] Further, the conductive housing 3 is made of a metal housing.
[0064] Further, the assembly process of the battery in this application is as follows:
[0065] 1. The PCBA board, the positive electrode cap, and the positive electrode post are integrally injection-molded to form the charge-discharge control module;
[0066] 2. The lithium battery core is installed in the metal housing, and the negative electrode tab is welded to the negative electrode part provided at the bottom of the metal housing by resistance welding;
[0067] 3. A rolling groove is formed on the metal housing to form a limiting protrusion;
[0068] 4. The positive electrode post of the charge-discharge control module is welded to the positive electrode tab on the lithium battery core by laser or ultrasonic or resistance welding;
[0069] 5. After steps such as moisture removal, liquid injection, and vacuum pumping for the core, the charge-discharge control module is pressed into the metal housing by a caulking machine, and the upper edge of the metal housing is caulked. The caulked upper edge is in contact connection with the gasket.
[0070] Further, the circuit principle of the battery in this application is as follows:
[0071] When connecting to an external circuit, there are two ways:
[0072] (1) The negative electrode tab 22 is connected to the negative electrode part 33 at the bottom of the metal housing, and the negative electrode part 33 serves as the negative electrode of the battery; the positive electrode tab 21 is connected to the positive electrode column 14 on the PCBA, and the positive electrode cap 13 is electrically connected to the PCBA. The positive electrode cap 13 serves as the positive electrode of the battery, and the positive and negative electrodes are at different ends.
[0073] (2) The negative electrode tab 22 is connected to the negative electrode part 33 at the bottom of the metal housing. The negative electrode part 33 is connected to the metal housing, and the metal housing is electrically connected to the PCBA. The PCBA is connected to the gasket 15, and the gasket 15 serves as the negative electrode; the positive electrode tab 21 is connected to the positive electrode column 14 on the PCBA, and the positive electrode cap 13 is electrically connected to the PCBA. The positive electrode cap 13 serves as the positive electrode of the battery, and the positive and negative electrodes are at the same end.
[0074] The internal closed-loop circuit of the battery is as follows: The negative electrode tab 22 is connected to the negative electrode part 33 at the bottom of the metal housing. The negative electrode part 33 is connected to the metal housing, and the metal housing is electrically connected to the PCBA. The positive electrode tab 21 is connected to the positive electrode column 14 on the PCBA. Through the above connections, the PCBA and the winding core 2 are formed into a closed loop to achieve the purpose of electrical connection, which can be used for the formation process of the winding core 2. During battery assembly, the winding core can be formed.
[0075] The advantages of this embodiment are as follows. Compared with the prior art: First, in this application, the module body 11, the PCBA board 12, the positive electrode cap 13, and the positive electrode column 14 are modularized into a whole to realize the assembly with the housing, which can improve the assembly efficiency; second, the winding core is first loaded into the housing, then the electrolyte is injected, and then it is coordinated with the charge and discharge control module 1 to achieve formation, which can realize the integration of the assembly and production of the winding core 2 and realize the automated production of the battery.
[0076] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A rechargeable lithium battery that can simplify production, characterized in that, Comprising: Charge and discharge control module; Winding core; Conductive housing; A first receiving groove and a second receiving groove are provided in the conductive housing, the first receiving groove is arranged above the second receiving groove, the charge and discharge control module is arranged in the first receiving groove, and the winding core is arranged in the second receiving groove; The charge and discharge control module includes a module body, a PCBA board, a positive electrode cap, and a positive electrode column. The PCBA board, the positive electrode cap, and the positive electrode column are integrally formed with the module body. The positive electrode cap and the positive electrode column are both electrically connected to the PCBA board, and one end of the positive electrode cap away from the PCBA board is exposed outside the conductive housing; a positive electrode tab is arranged at the upper end of the winding core, and a negative electrode tab is arranged at the lower end of the winding core. The positive electrode tab is electrically connected to one end of the positive electrode column away from the PCBA board. A negative electrode part is arranged at the bottom of the conductive housing, and the negative electrode tab is electrically connected to the negative electrode part; The charge and discharge control module further includes a gasket. The gasket is located at the top of the conductive housing, and the upper surface of the gasket is exposed outside the conductive housing and is electrically connected to the conductive housing.
2. A rechargeable lithium battery that can simplify production according to claim 1, characterized in that, The module body, the PCBA board, the positive electrode cap, and the positive electrode column are integrally injection molded.
3. A rechargeable lithium battery capable of simplifying production according to claim 1, characterized in that, A relief hole is provided in the middle of the gasket, and the positive electrode cap passes through the relief hole and is exposed outside the conductive housing.
4. A rechargeable lithium battery capable of simplifying production according to claim 3, characterized in that, The gasket is of an annular structure, and the outer wall of the annular structure is electrically connected to the conductive housing.
5. A rechargeable lithium battery capable of simplifying production according to claim 1, wherein The gasket and the conductive housing are both electrically connected to the PCBA, thereby indirectly realizing the electrical connection between the gasket and the conductive housing.
6. A rechargeable lithium battery that can simplify production according to claim 1, characterized in that, The PCBA board is located above the module body, and the gasket is located above the PCBA board.
7. A rechargeable lithium battery capable of simplifying production according to claim 1, characterized in that, Relief holes with corresponding positions are provided on the module body and the PCBA board, and the relief holes are filled with plugging members.
8. A rechargeable lithium battery capable of simplifying production according to claim 1, characterized in that, A limiting surface is provided on the outer wall of the module body, and a limiting protrusion is provided on the inner wall of the first receiving groove. The limiting protrusion and the limiting surface are in interference fit.
9. The rechargeable lithium battery capable of simplifying production according to claim 8, wherein, The limiting protrusion is located above the winding core.
10. A rechargeable lithium battery capable of simplifying production according to claim 8, characterized in that, The limiting surface is a concave arc surface, and the limiting protrusion is an arc protrusion protruding toward the inside of the conductive housing. The arc surface and the arc protrusion are in interference fit.