Battery cell and battery
By encapsulating the temperature sensor within the cell's sealing edge and connecting it to the tab, the problems of large temperature detection errors and corrosion of the temperature sensing element in lithium-ion batteries are solved, achieving accurate detection and cell structural stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNWODA ELECTRONICS CO LTD
- Filing Date
- 2025-06-12
- Publication Date
- 2026-07-10
AI Technical Summary
Existing lithium-ion battery temperature detection suffers from large errors, and the temperature sensing element is easily corroded by the electrolyte, affecting cell flatness and electrochemical reaction.
The temperature sensor body is encapsulated inside the cell's sealing edge and connected to the battery protection board via tabs, avoiding direct contact with the inside of the cell.
It achieves accurate cell temperature detection, avoids sensor corrosion by electrolyte, and maintains cell flatness and mechanical properties.
Smart Images
Figure CN224480981U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and more specifically, to a battery cell and a battery. Background Technology
[0002] Lithium-ion batteries are currently widely used in 3C electronic products, power tools, and electric vehicles. Lithium-ion batteries used in these products generally consist of lithium-ion cells and a protection board. Because lithium-ion batteries have a high energy density, improper use can lead to serious safety accidents. The main function of the battery protection board is to prevent overcharging, over-discharging, and other improper abuse that could cause fires and other safety incidents. In addition to current and voltage detection and control modules, battery protection boards typically also have temperature detection modules, such as using an NTC (Negative Temperature Coefficient) resistor to detect cell temperature. However, since the NTC is usually located on the protection board and does not directly contact the cell, the detected temperature can have a significant error. Some methods directly place the temperature sensing element inside the cell cavity, such as between the cell separator and / or electrodes, to detect cell temperature. However, placing the temperature sensing element inside the cell cavity can affect the cell's flatness and the internal electrochemical reactions. Furthermore, the temperature sensing element may be corroded by the electrolyte, reducing its sensitivity. Utility Model Content
[0003] The purpose of this application is to provide a battery cell and battery in response to at least one of the technical problems mentioned in the background art.
[0004] To achieve the above objectives, this application adopts the following technical solution:
[0005] One aspect of this application provides a battery cell, including a battery cell body, a tab, a battery cell seal, and a temperature sensor. The battery cell seal is fixed to the battery cell body, the tab passes through the battery cell seal and extends into the battery cell body, and the temperature sensor includes a sensor body encapsulated within the battery cell seal.
[0006] Optionally, the battery cell provided in this application further includes a tab adhesive coating layer, which covers the sensor body.
[0007] The beneficial effect of this technical solution is that it allows for better sealing of the sensor body, making it difficult for corrosive liquids and gases from the outside to corrode the sensor body. In this embodiment, an adhesive coating layer can also be applied over the two tabs.
[0008] Optionally, the temperature sensor further includes a detection end fixed to the sensor body, the detection end extending from the cell seal edge.
[0009] The advantage of this technical solution is that it facilitates the welding of the temperature sensor's detection end to the battery protection board via a metal wire. Alternatively, the detection end can be located within a slot on the cell's sealing edge, with the metal wire extending into the slot to connect to the detection end.
[0010] Optionally, the cell edge sealing includes a cell top seal, the cell top seal and the cell body are arranged in a first direction, the sensor body is encapsulated in the cell top seal, the electrode is installed in the top seal, and in a second direction the sensor body and the electrode are arranged side by side, the second direction is parallel to the length direction of the cell top seal and perpendicular to the first direction.
[0011] The beneficial effects of this technical solution are as follows: the sensor body and the electrode are arranged side by side on the top seal of the battery cell, which improves the thickness uniformity of the top seal area and enhances its mechanical properties. Alternatively, the electrode can be located at the top peak of the battery cell, and the sensor body can be located at the side seal area.
[0012] Optionally, the thickness of the sensor body in the third direction is the same as the thickness of the tab, and both the first direction and the second direction are perpendicular to the third direction.
[0013] The beneficial effects of this technical solution are that it further improves the thickness uniformity and further improves the mechanical properties of the top seal of the battery cell.
[0014] Optionally, the battery cell provided in this application includes two electrodes, one of which, the sensor body, and the other electrode are arranged sequentially in the second direction.
[0015] The beneficial effects of this technical solution are that it makes the structure of mounting the temperature sensor on the top seal of the battery cell applicable to most current battery cell structures, thus improving its applicability and facilitating its wider promotion and application. Alternatively, a structure in which two tabs and the sensor body are arranged sequentially can also be used.
[0016] Optionally, the temperature sensor further includes a detection end fixed to the sensor body, wherein the detection end extends from the side of the top seal of the cell away from the cell body in the first direction.
[0017] The beneficial effects of this technical solution are as follows: it allows the detection end to extend from the top seal of the cell in the same direction as the tab. The detection end utilizes the space occupied by the tab when it extends from the top seal of the cell, resulting in a uniform and regular overall shape of the cell, which facilitates the assembly of multiple cells together. Of course, the detection end can also extend from the top seal of the cell in a second direction or a third direction.
[0018] Optionally, the cell sealing edge includes a cell side seal, and the sensor body is encapsulated within the cell side seal.
[0019] The beneficial effect of this technical solution is that it can adapt to batteries with some special structures.
[0020] Optionally, the temperature sensor can be a sheet-type structure or a thin-film structure.
[0021] The beneficial effects of this technical solution are as follows: the temperature sensor is thinner, making it easier to achieve better thickness uniformity in the top sealing part of the battery cell, and thus making it easier to improve the mechanical properties of the top sealing part of the battery cell.
[0022] Another aspect of this application provides a battery including a battery protection board and a battery cell provided in this application, wherein the temperature sensor is connected to the battery protection board.
[0023] The technical solution provided in this application can achieve at least one of the following beneficial effects:
[0024] The battery cell and battery provided in this application neither fix the entire temperature sensor to the battery protection board nor place the temperature sensor inside the cell cavity. Instead, the sensor body of the temperature sensor is encapsulated inside the cell's sealing edge. This allows for effective detection of the cell temperature without affecting the electrochemical reaction inside the cell, and the temperature sensor is also less susceptible to corrosion from the electrolyte inside the cell. At the same time, it also gives the cell better flatness, and the temperature sensor does not occupy additional protection board or cell surface space.
[0025] The additional technical features and advantages of this application will become more apparent from the following description or from practical application. Attached Figure Description
[0026] To more clearly illustrate the technical solutions of the specific embodiments of this application, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of one embodiment of the battery cell provided in this application.
[0028] Figure label:
[0029] 01. Electrode; 02. Detection end;
[0030] 03. Sensor body; 04. Tab adhesive coating layer;
[0031] 05. Battery cell body; 06. Battery cell top seal;
[0032] 07. Cell side sealing. Detailed Implementation
[0033] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not 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 application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0036] The battery cell described in this application embodiment includes a packaging bag and various devices encapsulated inside the packaging bag. After the packaging bag covers each device, the covering space is sealed by the edge of the packaging bag. One end of the electrode tab passes through the edge of the sealing bag and is connected to the battery cell body, while the other end is located outside the covering space.
[0037] like Figure 1 As shown, one aspect of this application provides a battery cell, including a battery cell body 05, a tab 01, a battery cell seal, and a temperature sensor. The battery cell seal is fixed to the battery cell body 05, the tab 01 passes through the battery cell seal and extends into the battery cell body 05, and the temperature sensor includes a sensor body 03, which is encapsulated within the battery cell seal.
[0038] The battery cell provided in this application neither fixes the entire temperature sensor to the battery protection board nor places the temperature sensor inside the cell cavity. Instead, the sensor body of the temperature sensor is encapsulated inside the cell's sealing edge. This allows for effective detection of the cell temperature without affecting the electrochemical reaction inside the cell, and the temperature sensor is also less susceptible to corrosion from the electrolyte inside the cell. At the same time, it also gives the cell better flatness, and the temperature sensor does not occupy additional protection board or cell surface space.
[0039] Optionally, the battery cell provided in this application embodiment further includes a tab adhesive coating layer 04, which covers the sensor body 03. This provides better sealing of the sensor body 03, making it difficult for corrosive liquids and gases to corrode it. In this application embodiment, the tab adhesive coating layer 04 can also be applied over the two tabs 01.
[0040] Optionally, the temperature sensor further includes a detection end 02 fixed to the sensor body 03, the detection end 02 extending from the cell seal edge. This facilitates the welding of the detection end 02 of the temperature sensor to the battery protection board via a metal wire. Alternatively, the detection end 02 can be located within a slot on the cell seal edge, with the metal wire extending into the slot and connecting to the detection end 02.
[0041] Optionally, the cell sealing edge includes a cell top seal 06, which is arranged with the cell body 05 in a first direction. The sensor body 03 is encapsulated within the cell top seal 06, and the electrode 01 is mounted on the top seal. In a second direction, the sensor body 03 and the electrode 01 are arranged side-by-side, parallel to the length direction of the cell top seal 06 and perpendicular to the first direction. The side-by-side arrangement of the sensor body 03 and the electrode 01 on the cell top seal 06 improves the thickness uniformity of the cell top seal 06 and enhances its mechanical properties. Alternatively, the electrode 01 can be located at the top of the cell, and the sensor body 03 can be located at the side seal of the cell.
[0042] Optionally, the thickness of the sensor body 03 in the third direction is the same as the thickness of the tab 01, and both the first and second directions are perpendicular to the third direction. This further improves thickness uniformity and further enhances the mechanical properties of the cell top seal 06.
[0043] Optionally, the battery cell provided in this embodiment includes two tabs 01, with one tab 01, the sensor body 03, and the other tab 01 arranged sequentially in the second direction. This makes the structure of mounting the temperature sensor on the top seal 06 of the battery cell applicable to most current battery cell structures, improving its applicability and thus promoting its wider adoption. Alternatively, a structure in which the two tabs 01 and the sensor body 03 are arranged sequentially can also be used.
[0044] Optionally, the temperature sensor further includes a detection end 02 fixed to the sensor body 03, which extends from the side of the cell top seal 06 away from the cell body 05 in the first direction. This allows the detection end 02 to extend from the cell top seal 06 in the same direction as the tab 01. The detection end 02 utilizes the space occupied by the tab 01 when it extends from the cell top seal 06, making the overall shape of the cell uniform and regular, facilitating the assembly of multiple cells together. Of course, the detection end 02 can also extend from the cell top seal 06 in a second direction or a third direction.
[0045] Optionally, the cell sealing edge includes a cell side seal 07, and the sensor body 03 is encapsulated within the cell side seal 07 to accommodate batteries with special structures.
[0046] Optionally, the temperature sensor can be a thin-film or a non-thin-film structure. This results in a smaller temperature sensor thickness, making it easier to achieve better thickness uniformity at the top seal 06 of the battery cell, and thus more easily improving the mechanical properties of the top seal 06.
[0047] Another aspect of this application provides a battery including a battery protection board and a battery cell provided in the embodiments of this application, wherein the temperature sensor is connected to the battery protection board.
[0048] The battery provided in this application uses the battery cell provided in this application. Instead of fixing the entire temperature sensor to the battery protection board or placing the temperature sensor inside the cell cavity, the sensor body of the temperature sensor is encapsulated inside the cell seal. This allows for effective detection of the cell temperature without affecting the electrochemical reaction inside the cell, and the temperature sensor is also less susceptible to corrosion from the electrolyte inside the cell. At the same time, it also gives the cell better flatness, and the temperature sensor does not occupy additional protection board or cell surface space.
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A battery cell, characterized in that, The device includes a battery cell body (05), a tab (01), a battery cell seal, and a temperature sensor. The battery cell seal is fixed to the battery cell body (05), and the tab (01) passes through the battery cell seal and extends into the battery cell body (05). The temperature sensor includes a sensor body (03), which is encapsulated within the battery cell seal.
2. The battery cell according to claim 1, characterized in that, It also includes a tab adhesive coating layer (04), which covers the outside of the sensor body (03).
3. The battery cell according to claim 1, characterized in that, The temperature sensor also includes a detection end (02) fixed to the sensor body (03), the detection end (02) extending from the battery cell seal edge.
4. The battery cell according to any one of claims 1 to 3, characterized in that, The cell sealing edge includes a cell top seal (06), the cell top seal (06) and the cell body (05) are arranged in a first direction, the sensor body (03) is encapsulated in the cell top seal (06), and the electrode (01) is installed on the top seal. In a second direction, the sensor body (03) and the electrode (01) are arranged side by side. The second direction is parallel to the length direction of the cell top seal (06) and perpendicular to the first direction.
5. The battery cell according to claim 4, characterized in that, The thickness of the sensor body (03) in the third direction is the same as the thickness of the tab (01), and both the first direction and the second direction are perpendicular to the third direction.
6. The battery cell according to claim 4, characterized in that, It includes two electrodes (01), one electrode (01), the sensor body (03) and the other electrode (01) arranged sequentially in the second direction.
7. The battery cell according to claim 4, characterized in that, The temperature sensor also includes a detection end (02) fixed to the sensor body (03), and the detection end (02) extends from the side of the cell top seal (06) away from the cell body (05) in the first direction.
8. The battery cell according to any one of claims 1 to 3, characterized in that, The cell sealing edge includes a cell side seal, and the sensor body (03) is encapsulated within the cell side seal.
9. The battery cell according to any one of claims 1 to 3, characterized in that, The temperature sensor can be a thin-film or a membrane structure.
10. A battery, characterized in that, It includes a battery protection board and a battery cell as described in any one of claims 1 to 9, wherein the temperature sensor is connected to the battery protection board.