Temperature control protection soft package laminated battery cell
By integrating the NTC element with the main cell and using a tab protection structure, the lithium plating problem of soft-pack laminated cells in low-temperature environments has been solved, improving the safety and lifespan of the cells and enabling intelligent temperature management.
Patent Information
- Application Number
- CN202423167762.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Existing pouch cells lack effective temperature monitoring and protection mechanisms in extreme low-temperature environments, leading to lithium plating, reduced battery life, and potential safety hazards.
The design integrates NTC components with the main body of the battery cell. By sensing the temperature and resistance changes of the NTC components, the charging circuit is controlled to prevent current flow. Combined with the protective structure of the tabs and aluminum-plastic film, intelligent temperature management is achieved.
It effectively prevents lithium plating risk under low temperature conditions, improves cell safety and lifespan, reduces consumable costs, ensures stable power transmission and circuit safety, and has intelligent temperature monitoring and management functions.
Smart Images
Figure CN223911741U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of polymer lithium ion battery cells, in particular to a temperature control protection soft package laminated cell. BACKGROUND
[0002] In recent years, with the rapid development of new energy vehicle and consumer electronics market, soft package laminated cell is favored due to its lightness, high energy density and good cycle performance, but the performance degradation and safety problem of such cell in extreme low temperature environment has been a difficult problem to be solved in the industry.
[0003] Prior art solution: the existing soft package laminated cell usually does not have built-in low temperature protection mechanism, when the ambient temperature is too low, it still allows charging, which may cause lithium precipitation in the battery, not only reduces the battery life, but also may cause safety hazards, and the lack of effective temperature monitoring and control measures leads to improper low temperature charging and discharging management, which is easy to cause battery damage, especially when used in winter cold regions, this problem is particularly prominent. SUMMARY
[0004] In order to improve the above problems, the present application provides a temperature control protection soft package laminated cell.
[0005] The temperature control protection soft package laminated cell provided by the present application adopts the following technical solution:
[0006] A temperature control protection soft package laminated cell, comprising a cell body, a tab and an NTC element; the cell body is integrally provided with a current collector at one end; the NTC element is connected with the current collector at one end and welded with the tab at the other end, forming a series circuit; the NTC element is pre-set with a temperature threshold value, and the resistance value of the NTC element changes with temperature, cutting off the charging circuit or conducting the charging circuit.
[0007] By adopting the above technical solution, through the integrated design of the NTC element and the cell body, the cell body can change its resistance value under low temperature conditions, thereby reliably preventing lithium precipitation risk during charging process, improving the safety and service life of the cell.
[0008] Optionally, the tab is divided into positive and negative electrodes, and the NTC element is connected with the tab of any electrode.
[0009] By adopting the above technical solution, without setting two groups of NTC elements, the tab of the positive and negative electrodes only needs to change the resistance value of any electrode to control the current, reducing the cost of consumables.
[0010] Optionally, the welding of the NTC element and the tab is any welding mode of tin welding, laser welding or ultrasonic welding.
[0011] By adopting the technical scheme, the connection stability of the NTC element and the tab is improved by any welding mode, and the bearing capacity is improved.
[0012] Optionally, the tab is divided into two sections, namely a wrapping section and an extension section; the wrapping section is wrapped with an aluminum plastic film, and the aluminum plastic film wraps the NTC element therein; and the extension section is used to externally connect a circuit.
[0013] By adopting the technical scheme, the wrapping section of the tab cooperates with the aluminum plastic film to protect the NTC element, and the extension section externally connects the circuit to ensure the stability of power transmission.
[0014] Optionally, the welding point of the NTC element and the tab is further wrapped with a protective tape, and the protective tape is located within the wrapping range of the aluminum plastic film.
[0015] By adopting the technical scheme, after welding, the NTC element and the welding point are wrapped with the protective tape to realize electrical isolation and ensure the safety and stability of the internal circuit of the battery cell.
[0016] Optionally, the wrapping mode of the aluminum plastic film adopts a winding wrapping mode or a double-sided lamination mode.
[0017] By adopting the technical scheme, any wrapping mode can stably connect the NTC element and the tab with the aluminum plastic film, and according to different wrapping modes, a tight connection or an attractive wrapping style effect can be realized.
[0018] Optionally, the wrapping section of the tab is further provided with a temperature sensing element; the temperature sensing element is located within the wrapping range of the aluminum plastic film; and the temperature sensing element is electrically connected with an external battery cell management system.
[0019] By adopting the technical scheme, the temperature sensing element can sense temperature changes and transmit electrical signals to the external battery cell management system, so as to intelligently manage and maintain each battery cell, monitor the state of the battery, prevent overcharging or overdischarging of the battery, and prolong the service life of the battery.
[0020] Optionally, the wrapping section of the tab is coated with a layer of heat-seal adhesive; the wrapping section and the aluminum plastic film are sealed by heat-seal connection of the heat-seal adhesive and the aluminum plastic film.
[0021] By adopting the technical scheme, the heat-seal adhesive can soften under heat-seal conditions and fully contact the aluminum plastic film and the wrapping section until re-solidification, so that the connection between the wrapping section and the aluminum plastic film is more firm and stable, and the sealing performance of the wrapping section and the aluminum plastic film is improved.
[0022] In summary, the present application includes at least one of the following beneficial technical effects:
[0023] 1. Through the integration design of NTC element and the main body of the battery cell, the main body of the battery cell can change its resistance value under low temperature conditions, thereby reliably preventing the reduction of lithium risk during the charging process and improving the safety and service life of the battery cell;
[0024] 2. Without setting two groups of NTC elements, the tab of the positive and negative electrodes only needs to change the resistance value of any electrode to control the current, reducing the cost of consumables;
[0025] 3. The wrapping section of the tab cooperates with the aluminum plastic film to protect the NTC element, and the extension section is connected with the circuit to ensure the stability of power transmission;
[0026] 4. After welding, the NTC and the welding point are wrapped with protective tape to realize electrical isolation and ensure the safety and stability of the internal circuit of the battery cell. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1 is a semi-perspective structural schematic diagram of the front view direction of the battery cell in an embodiment of the present application;
[0028] Figure 2 is a semi-perspective structural schematic diagram of the battery cell in some embodiments of the present application;
[0029] The marks in the drawings are: 1, the main body of the battery cell, 11, the current collector, 2, the tab, 21, the wrapping section, 22, the extension section, 23, the protective tape, 3, the NTC element, 4, the aluminum plastic film, 5, the temperature sensing piece. DETAILED DESCRIPTION
[0030] The embodiments of the present application are described below through specific and concrete examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosed information. The present application can also be implemented or applied in different specific embodiments, and the details in the present application can be modified or changed according to different views and application systems without departing from the spirit of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0031] The embodiments of the present application are described in detail below with reference to the drawings, so that those skilled in the art can easily implement the present application. The present application can be embodied in various different forms, and is not limited to the embodiments described herein.
[0032] In the description of the present application, the expression of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics represented can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the different embodiments or examples represented in the present application and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.
[0033] In addition, the terms "first", "second" are only used to represent the object and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.
[0034] Throughout the specification, when it is said that a device is "connected" to another device, it not only includes the case of "direct connection", but also includes the case of "indirect connection" in which other elements are placed therebetween. In addition, when it is said that a device "includes" a certain constituent element, unless otherwise specifically stated, other constituent elements are not excluded, but it means that other constituent elements can also be included.
[0035] The following will be described in detail in combination with the accompanying drawings. Figure 1 - The accompanying drawings Figure 2 The present application will be further described in detail.
[0036] The embodiment of the present application discloses a temperature control protection soft package laminated cell.
[0037] A temperature control protection soft package laminated cell is applied to electric vehicle power battery systems, electronic products (such as smart phones, notebook computers), industrial energy storage systems and other scenes, and solves the problem that improper low-temperature charging and discharging management caused by lack of effective temperature monitoring and control measures easily causes battery damage.
[0038] Reference Figure 1 As shown, it includes a cell body 1, a tab 2 and an NTC element 3; the cell body 1 provides storage and charging and discharging of power, and one end of the cell body 1 is integrally provided with a current collector 11, the current collector 11 is divided into two groups, which are respectively positive and negative current collectors 11, and the current collector 11 can adopt copper foil material.
[0039] The current collector 11 is provided with an NTC element 3, which is also called a negative temperature coefficient thermistor. The resistance value of the NTC element 3 can increase or decrease with the change of temperature, so as to control the current size when the tab 2 is electrified. The other end of the NTC element 3 is connected with the tab 2. The tab 2 is also called a lug, which is used to provide an output or input terminal for power connection. The NTC element 3 is welded with the tab 2, so that the positive or negative current collector 11-NTC element 3-tab 2 forms a series circuit.
[0040] The material of the NTC element 3 has a preset temperature threshold. The resistance value of the NTC element 3 changes with temperature, which cuts off or turns on the charging circuit. Referring to the NTC element 3 below, the characteristics of the NTC element 3 are that the resistance value is a standard set value R1 when the temperature is 0℃, the resistance rises to 2R1 when the temperature is-10℃, that is, the resistance value is twice R1, and so on, until it reaches 5R1 when the temperature is-20℃. It can block most of the current. This selection ensures that when the ambient temperature drops to a dangerous critical point, the current in the charging process is almost completely blocked, effectively protecting the battery from low temperature damage.
[0041] Through the integrated design of the NTC element 3 and the battery body 1, the battery body 1 can change its resistance value under low temperature conditions, so as to reliably prevent the flow of current in the charging process, reduce the risk of lithium precipitation, and improve the safety and service life of the battery.
[0042] In the design of the battery, the top of the battery body 1 is not sealed, that is, one end of the integrated current collector 11, which can accommodate the NTC element 3 and its connecting circuit, so that the size of the entire battery remains unchanged, and it is compatible with the original assembly line and packaging requirements.
[0043] In the process of making the battery, the welding of the current collector 11 to the NTC element 3 and the metal tab 2 is completed. The NTC element 3 model suitable for different environmental conditions can be selected according to the requirements, which enhances the adaptability of the battery.
[0044] In the process, the reserved position of the current collector 11 of the semi-finished battery after the receiving stack process can be accurately positioned by a visual recognition system. A robot arm controls the welding head to accurately weld the NTC element and the tab 2 to the specified positive and negative current collector 11 according to the preset programming instructions.
[0045] After welding, quality detection needs to be started to confirm that the welding strength meets the qualified standard and there is no short circuit sign, so as to ensure the stable connection of the NTC element 3 with the tab 2 and the current collector 11.
[0046] Further, referring to Figure 1As shown, the tab 2 is divided into positive and negative electrodes, corresponding to the positive and negative poles of the current collector 11, and the NTC element 3 is connected with the tab 2 of any electrode, without the need to set two groups of NTC elements 3, and the tab 2 of the positive and negative poles only needs the resistance value of any electrode to change to control the current, reducing the cost of consumables.
[0047] Among them, the tab 2 without NTC element 3 is directly connected with the current collector 11 corresponding to the electrode.
[0048] Further, the welding of the NTC element 3 and the tab 2 is any welding mode of soldering, laser welding or ultrasonic welding, which provides stable connection of the NTC element 3 and the tab 2 through any welding of soldering, laser welding or ultrasonic welding, improves the bearing capacity and reduces the fracture of the connection point.
[0049] In some embodiments, referring to Figure 1 or Figure 2 As shown, the tab 2 is divided into a wrapped section 21 and an extended section 22, the wrapped section 21 is wrapped with an aluminum plastic film 4, and the aluminum plastic film 4 wraps the NTC element 3 therein, which provides protection for the NTC element 3 and protects the connection point of the tab 2 and the current collector 11, avoids separation under stress, and at the same time ensures that the setting of the NTC element 3 does not affect the overall size and performance of the battery cell within the normal working temperature range, and the extended section 22 is used for external connection circuit to ensure the stability of power transmission when the battery cell is applied or charged and discharged.
[0050] Further, the welding point of the NTC element 3 and the tab 2 is also wrapped with a protective tape 23, and the protective tape 23 is located within the wrapping range of the aluminum plastic film 4, and the protective tape 23 can be an insulating tape. After welding, the NTC and the welding point part are wrapped by the packaging form of the protective tape 23, which not only makes the connection of the NTC element 3 and the tab 2 more firm and not easy to fall off due to vibration or other forces, but also ensures the stability of long-term operation, and can realize electrical isolation to ensure the safety and stability of the internal circuit of the battery cell.
[0051] And the protective tape 23 is located within the wrapping range of the aluminum plastic film 4, so that the aluminum plastic film 4 wraps the protective tape 23 to provide a layer of protection outside the protective tape 23, avoid scratching or scratching off the protective tape 23 by sharp objects such as metal sheets or the core of certain wires, and use the aluminum plastic film 4 to protect the integrity of the protective tape 23 to ensure the integrity of the insulating property and ensure the safety in use.
[0052] Further, the wrapping method of the aluminum plastic film 4 adopts the wrapping method of winding or double-sided lamination. The winding wrapping method is to make the aluminum plastic film 4 make a circular motion along the wrapped section 21 of the tab 2 and the NTC element 3 to completely wrap the aluminum plastic film 4 on the wrapped section 21. The double-sided lamination method is to use two aluminum plastic films 4 to be laminated with each other, and the wrapped section 21 of the tab 2 and the NTC are located between the two aluminum plastic films 4, so that after lamination, the wrapped section 21 and the NTC are completely wrapped.
[0053] The wrapping manner can make the connection of the wrapping section 21 and the NTC closer, and the operation is simple and convenient, and the double-sided fitting manner can make the appearance of the wrapping more beautiful and more valuable, and both can provide protection for the NTC element 3 and the wrapping section 21, and any wrapping manner can be selected according to the requirement.
[0054] In some embodiments, with reference to Figure 2 As shown, the wrapping section 21 of the tab 2 is further provided with a temperature sensing piece 5, the connection manner of the temperature sensing piece 5 and the wrapping section can be point gluing and bonding, the temperature sensing piece 5 can adopt a small temperature sensor, the temperature sensing piece 5 is located in the wrapping range of the aluminum plastic film 4, so that the temperature sensing piece 5 can be wrapped and protected by the aluminum plastic film 4, the temperature sensing piece 5 is electrically connected with the external battery management system, the temperature sensing piece 5 can sense the temperature change and transmit the electrical signal to the external battery management system (BMS) to intelligently manage and maintain each battery unit, monitor the state of the battery, prevent overcharging or overdischarging of the battery, and prolong the service life of the battery.
[0055] For example, when the temperature sensing piece 5 detects an abnormal downward trend of the external temperature, the battery management system (BMS) immediately takes action, on the one hand, triggers an alarm to remind the user or maintenance team, and on the other hand, adjusts the working mode of the battery, and forcibly closes the charging interface if necessary, until the environment returns to the safe temperature range. This intelligent protection strategy significantly enhances the self-protection ability of the battery in the face of sudden cold damage and improves the overall reliability of the system.
[0056] Further, the sensing end of the temperature sensing piece 5 can be provided with two, one sensing end is used for sensing the ambient temperature of the battery, and cooperates with the NTC element 3 to construct a double protection mechanism, so that even if the NTC element 3 fails, timely warning can be made to avoid potential failure from becoming a safety problem and improve the adaptability of the battery in various harsh environments.
[0057] The other sensing end of the temperature sensing piece 5 is used for detecting the temperature of the tab 2 or the battery body 1, and when the current is too large, the temperature of the tab 2 and the battery body 1 will rise, such as overdischarging or overcharging, so that the temperature abnormality of the tab 2 or the battery body 1 is detected to timely transmit an electrical signal to the battery management system (BMS) for early warning and further improve the use safety.
[0058] Further, the temperature sensing piece 5 can be arranged at the tab 2 where the NTC element 3 is not arranged, because the resistance value of the NTC element 3 will gradually change with the influence of the ambient temperature, and the changed resistance value is different, and the temperature of the NTC element 3 will change synchronously during charging and discharging, so that the temperature sensing piece 5 is prone to misjudgment, therefore, the setting position of the temperature sensing piece 5 can be at the tab 2 where the NTC element 3 is not arranged, to ensure the accuracy of temperature detection.
[0059] In some embodiments, the wrapping section 21 of the tab 2 is coated with a layer of heat-seal glue, and the wrapping section 21 is sealed with the aluminum plastic film 4 by heat-seal connection. The heat-seal glue can soften and fully contact the aluminum plastic film 4 and the wrapping section 21 under the condition of heat-seal, and then solidify again, so that the connection between the wrapping section 21 and the aluminum plastic film 4 is more firm and stable, and the sealing performance of the wrapping section 21 and the aluminum plastic film 4 is improved.
[0060] In the drawings, the heat-seal glue is not shown because the heat-seal glue has a layered structure and the illustration is difficult to express.
[0061] The embodiments of the specific implementation are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same reference numerals are used to represent the same parts in the embodiments. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A temperature-controlled protective pouch-stacked cell, characterized by, The application relates to a battery cell, which comprises a cell body (1), a tab (2) and an NTC element (3); one end of the cell body (1) is integrally provided with a current collector (11); one end of the NTC element (3) is connected with the current collector (11), and the other end is welded with the tab (2), thereby forming a series circuit; the NTC element (3) is preset with a temperature threshold value; the resistance of the NTC element (3) changes with temperature, thereby cutting off or conducting a charging circuit; the tab (2) is divided into two electrodes, the NTC element (3) is connected with the tab (2) of any electrode; the tab (2) is divided into two sections, namely a wrapping section (21) and an extension section (22); the wrapping section (21) is wrapped with an aluminum plastic film (4), and the aluminum plastic film (4) wraps the NTC element (3) therein; the extension section (22) is used for externally connecting a circuit.
2. The temperature-controlled protective pouch-lamella battery cell according to claim 1, characterized in that The welding of the NTC element (3) and the tab (2) is any welding mode of tin welding, laser welding or ultrasonic welding.
3. The temperature-controlled protective pouch-lamella battery cell of claim 1, wherein, The welding point of the NTC element (3) and the tab (2) is further wrapped with a protective tape (23), and the protective tape (23) is located in the wrapping range of the aluminum plastic film (4).
4. The temperature-controlled protective pouch-lamella battery cell of claim 1, wherein, The wrapping mode of the aluminum plastic film (4) adopts a winding wrapping mode or a double-sided sticking mode.
5. The temperature-controlled protective pouch-lamella battery cell according to any one of claims 1-4, characterized in that, The wrapping section (21) of the tab (2) is further provided with a temperature sensing element (5); the temperature sensing element (5) is located in the wrapping range of the aluminum plastic film (4); the temperature sensing element (5) is electrically connected with an external cell management system.
6. The temperature-controlled protective pouch-lamella battery cell of claim 5, wherein, The wrapping section (21) of the tab (2) is coated with a layer of heat-sealing glue; the wrapping section (21) and the aluminum plastic film (4) are sealed through heat-sealing connection of the heat-sealing glue and the aluminum plastic film (4).