Battery assembly
By attaching an ultra-thin thermistor to the surface of a lithium battery cell, combined with an analog-to-digital converter and a control module, the problem of inaccurate temperature detection in lithium batteries is solved, achieving miniaturization of battery components and efficient safety protection.
Patent Information
- Application Number
- CN202423273284.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2034-12-27
AI Technical Summary
In existing technologies, the temperature detection of lithium batteries is not accurate enough, making it difficult to prevent the risk of thermal runaway. In addition, the protection board is large and not conducive to the miniaturization of equipment.
An ultra-thin thermistor is attached to the surface of the battery cell, and the battery temperature is directly detected by a thermal acquisition unit. Combined with an analog-to-digital converter and a control module, accurate temperature monitoring is achieved.
It improves the accuracy and sensitivity of individual battery cell temperature detection, reduces the size of battery modules, and achieves efficient temperature monitoring and safety protection for lithium batteries.
Smart Images
Figure CN223927414U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to display technical field especially relates to a battery assembly. BACKGROUND
[0002] With the development of mobile devices, lithium batteries are widely used, and as the capacity of lithium batteries increases, lithium batteries are prone to overcharge, overdischarge and thermal runaway, which can cause rapid expansion and explosion of the battery. Therefore, it is necessary to monitor the thermal information of the battery to prevent accidents.
[0003] Currently, the battery is generally protected by a battery protection board, which has various resistance elements and capacitor elements, etc. This results in a large volume of the protection board, which is not conducive to the detection of the battery temperature. In addition, the temperature monitoring element is generally attached to the battery collection component, the battery pole or the heat conduction component of the battery to detect the temperature of the battery. This can result in inaccurate monitoring of the actual operating temperature of the battery and cause accidents. SUMMARY
[0004] The utility model provides a kind of battery assembly to improve the precision and sensitivity of battery monomer temperature detection.
[0005] According to one aspect of the utility model, the utility model embodiment discloses a battery assembly, comprising:
[0006] At least one battery monomer and at least one heat collection unit, the heat collection unit is attached to the surface of the battery monomer, and the heat collection unit is used to collect the temperature signal of the battery monomer.
[0007] Optionally, the heat collection unit is a thermistor, and the average thickness of the thermistor is greater than or equal to 5 nm and less than or equal to 5 μm.
[0008] Optionally, the first port of the thermistor is electrically connected to the pole of the battery monomer, and the second port of the thermistor is electrically connected to the electrode of the battery monomer; or the first port of the thermistor is electrically connected to the electrode of the battery monomer, and the second port of the thermistor is electrically connected to the pole of the battery monomer; or the first port of the thermistor is electrically connected to the power input end, and the second port of the thermistor is electrically connected to the power output end.
[0009] Optionally, the heat collection unit covers at least one battery monomer.
[0010] Optionally, at least two heat collection units are attached to the surface of each battery monomer.
[0011] Optionally, the at least two heat collection units are arranged uniformly, or the at least two heat collection units are arranged in a set.
[0012] Optionally, the at least two heat collection units are connected in series, or the at least two heat collection units are connected in parallel.
[0013] Optionally, the battery assembly further comprises an analog-digital converter, an input end of the analog-digital converter is electrically connected with the heat collection unit, and an output end of the analog-digital converter is electrically connected with the control module.
[0014] Optionally, the battery assembly further comprises a fixed resistor, the heat collection unit and the fixed resistor are connected in series to form a voltage divider, the voltage divider is electrically connected with an input end of the analog-digital converter, and an output end of the analog-digital converter is electrically connected with the control module.
[0015] Optionally, the battery assembly further comprises:
[0016] The control module is configured to detect a voltage of the heat collection unit, and determine a temperature of the battery monomer according to the voltage of the heat collection unit; the control module is further configured to control the battery monomer to stop charging or discharging when the temperature of the battery monomer is greater than or equal to a first temperature threshold.
[0017] Alternatively, the control module is configured to detect a resistance value of the heat collection unit, and determine a temperature of the battery monomer according to the resistance value of the heat collection unit; the control module is further configured to control the battery monomer to stop charging or discharging when the temperature of the battery monomer is greater than or equal to a first temperature threshold.
[0018] Alternatively, the control module is configured to detect a current of the heat collection unit, and determine a temperature of the battery monomer according to the current of the heat collection unit; the control module is further configured to control the battery monomer to stop charging or discharging when the temperature of the battery monomer is greater than or equal to a first temperature threshold.
[0019] In the embodiment of the utility model, the heat collection unit is attached to the surface of the battery monomer, and the heat collection unit can directly detect the temperature of the battery monomer, thereby solving the problem that the temperature of the battery cannot be detected due to the large size of the protection plate in the prior art, and the heat collection unit is attached to the surface of the battery monomer, so that the temperature of the battery monomer can be accurately measured, and the detection accuracy and sensitivity of the temperature of the battery monomer are improved.
[0020] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, nor is it used to limit the scope of the utility model. Other features of the utility model will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of a battery assembly provided in an embodiment of the present invention;
[0023] Figure 2 This is a flowchart illustrating the operation of a battery assembly according to an embodiment of the present invention. Detailed Implementation
[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, any variations of the terms "comprising" and "having" are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0026] Figure 1 This is a schematic diagram of a battery assembly according to an embodiment of the present invention. See also: Figure 1 The battery assembly includes at least one battery cell 10 and at least one thermal acquisition unit 11. The thermal acquisition unit 11 is attached to the surface of the battery cell 10 and is used to acquire the temperature signal of the battery cell 10.
[0027] Among them, the heat acquisition unit 11 is a thermistor with an average thickness greater than or equal to 5nm and less than or equal to 5μm.
[0028] In this embodiment of the invention, the heat acquisition unit 11 is attached to the surface of the battery cell 10. The heat acquisition unit 11 can directly detect the temperature of the battery cell 10, solving the problem in traditional technology where the large size of the protection board makes it impossible to accurately detect the temperature of the battery cell 10. Furthermore, the heat acquisition unit 11, being attached to the surface of the battery cell 10, can accurately measure the temperature of the battery cell 10, improving the detection accuracy and sensitivity. Simultaneously, the ultra-thin thermistor, due to its ultra-thin design, can be sufficiently close to the battery, and its performance is significantly better than conventional thermistors such as thick-film thermistors, thick-sheet thermistors, and thin-sheet thermistors, resulting in a smaller size and facilitating the miniaturization of the battery assembly 1.
[0029] See Figure 1 Optionally, based on the above embodiments, the heat acquisition unit 11 is a thermistor, and the average thickness of the thermistor is greater than or equal to 5 nm and less than or equal to 5 μm. It should be noted that the average thickness of the thermistor can be 5 nm, 10 nm, 15 nm, 25 nm, 50 nm, 75 nm, 100 nm, 150 nm, 200 nm, 250 nm, 300 nm, 400 nm, 500 nm, 700 nm, 800 nm, 900 nm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, or any range of two values.
[0030] Specifically, when the average thickness of the thermistor is too thick, the thermistor becomes too large, which is not conducive to its adhesion to the surface of the battery cell 10 and affects the accuracy of temperature detection of the battery cell 10. When the average thickness of the thermistor is too small, it will affect the sheet resistance of the thermistor, making the sheet resistance uneven and difficult to accurately detect the battery temperature. Therefore, the average thickness of the thermistor is set to be greater than or equal to 5nm and less than or equal to 5μm, which makes it easier for the thermistor to adhere to the surface of the battery cell 10, improves the accuracy of temperature detection of the battery cell 10, and makes the sheet resistance of the thermistor uniform; at the same time, it can reduce the overall volume of the battery assembly 1.
[0031] See Figure 1 Optionally, based on the above embodiments, the first port of the thermistor is electrically connected to the terminal of the battery cell 10, and the second port of the thermistor is electrically connected to the electrode of the battery cell 10; or the first port of the thermistor is electrically connected to the electrode of the battery cell 10, and the second port of the thermistor is electrically connected to the terminal of the battery cell 10; or the first port of the thermistor is electrically connected to the power input terminal, and the second port of the thermistor is electrically connected to the power output terminal.
[0032] In this configuration, the terminal of the battery cell 10 is the positive electrode, and the electrode of the battery cell 10 is the negative electrode. The terminal of the battery cell 10 is used for connection to an external circuit.
[0033] See Figure 1 Optionally, based on the above embodiments, the heat collection unit 11 covers at least one battery cell 10.
[0034] The heat collection unit 11 can cover one battery cell 10, or two battery cells 10, or multiple battery cells 10.
[0035] In an embodiment of this utility model, the heat collection unit 11 covers at least one battery cell 10. This arrangement enables the heat collection unit 11 to accurately detect the temperature of each part of the battery cell 10, thereby improving the accuracy and sensitivity of temperature detection.
[0036] See Figure 1 Optionally, based on the above embodiments, at least two heat collection units 11 are attached to the surface of each battery cell 10.
[0037] At least two heat collection units 11 are attached to the surface of each battery cell 10, and the at least two heat collection units 11 are attached to the battery cell 10 in a distributed arrangement.
[0038] In this embodiment of the invention, by setting at least two heat collection units 11 to be attached to the surface of each battery cell 10, the heat collection units 11 can accurately detect the temperature of each part of the battery cell 10, thereby improving the accuracy and sensitivity of temperature detection.
[0039] See Figure 1 Optionally, based on the above embodiments, at least two heat collection units 11 are arranged in a uniform manner, or at least two heat collection units are arranged in a cluster manner.
[0040] The uniform arrangement refers to arranging multiple heat collection units 11 on the surface of the battery assembly 1 at equal intervals or uniformly. The cluster arrangement includes uniform arrangement, symmetrical arrangement, and grid arrangement. The cluster arrangement is to arrange multiple heat collection units 11 on the surface of the battery assembly 1 in a symmetrical form or in a grid form. In addition, those skilled in the art can also attach the corresponding heat collection units to suitable positions on the battery surface according to actual needs.
[0041] This configuration enables the multiple heat acquisition units 11 to accurately acquire the temperature on the surface of the battery cell 10 and determine the specific location of the heat source, thereby improving the detection accuracy and sensitivity of the battery cell 10 temperature.
[0042] See Figure 1 Optionally, based on the above embodiments, at least two heat collection units 11 are connected in series or at least two heat collection units 11 are connected in parallel.
[0043] Specifically, at least two heat collection units 11 are disposed on the surface of the battery cell 10, and at least two heat collection units 11 are connected in series or in parallel, so that multiple heat collection units 11 can collect the temperature at different locations on the battery cell 10, thereby realizing the accurate detection of the temperature of the battery cell 10 by the heat collection units 11.
[0044] See Figure 1 Optionally, based on the above embodiments, the battery assembly further includes: an analog-to-digital converter, the input terminal of which is electrically connected to the thermal acquisition unit 11, and the output terminal of which is electrically connected to the control module.
[0045] Specifically, the temperature signal collected by the heat acquisition unit 11 is converted into a digital signal by an analog-to-digital converter, and then the digital signal is transmitted to the control module.
[0046] See Figure 1 Optionally, based on the above embodiments, the battery assembly further includes: a fixed resistor, with the heat acquisition unit 11 connected in series with the fixed resistor to form a voltage divider, the voltage divider being electrically connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter being electrically connected to the control module. The fixed resistor can also be connected in parallel with the heat acquisition unit 11.
[0047] See Figure 1 Optionally, based on the above embodiments, the battery assembly further includes: a control module, which is used to detect the voltage of the heat collection unit 11 and determine the temperature of the battery cell 10 based on the voltage of the heat collection unit 11; the control module is also used to control the battery cell 10 to stop charging or discharging when the temperature of the battery cell 10 is greater than or equal to a first temperature threshold; or, the control module is used to detect the resistance value of the heat collection unit 11 and determine the temperature of the battery cell 10 based on the resistance value of the heat collection unit 11, and the control module is also used to control the battery cell 10 to stop charging or discharging when the temperature of the battery cell 10 is greater than or equal to the first temperature threshold; or, the control module is used to detect the current value of the heat collection unit 11 and determine the temperature of the battery cell 10 based on the current value of the heat collection unit 11, and the control module is also used to control the battery cell 10 to stop charging or discharging when the temperature of the battery cell 10 is greater than or equal to the first temperature threshold.
[0048] The control module can be installed on the battery assembly. The control module is used to collect the voltage of the heat collection unit 11, or to detect the resistance value of the heat collection unit 11, or to detect the current value of the heat collection unit 11. The control module determines the temperature of the battery cell by the voltage change of the heat collection unit, or by the resistance change of the heat collection unit, or by the current change of the heat collection unit. In this embodiment of the invention, the control module is used to control the rechargeable battery cell 10 to stop charging or discharging when the temperature of the battery assembly 1 is greater than or equal to a first temperature threshold, and to control the rechargeable battery cell 10 to stop charging or discharging when the temperature of the battery assembly 1 is greater than or equal to a second temperature threshold, thereby protecting the battery assembly 1 and preventing damage to the battery assembly 1 due to excessive temperature.
[0049] Figure 2 This is a flowchart illustrating the operation of a battery assembly according to an embodiment of the present invention. (See attached diagram.) Figure 2 When the battery pack starts working, the thermal acquisition unit collects the temperature of the individual battery cells. Since the thermal acquisition unit and the fixed resistor are connected in series to form a voltage divider, the voltage divider converts the temperature signal into a voltage signal and sends the voltage signal to the analog-to-digital converter. The analog-to-digital converter receives the voltage signal sent by the voltage divider and converts the voltage signal into a digital signal. The analog-to-digital converter transmits the digital signal to the control module. The control module determines the temperature of the individual battery cells collected by the thermal acquisition unit based on the digital signal. When the temperature of the individual battery cells is greater than or equal to a first temperature threshold, the control module controls the individual battery cells to stop charging or discharging.
[0050] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.
[0051] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A battery assembly, characterized in that, include: At least one battery cell and at least one thermal acquisition unit, wherein the thermal acquisition unit is attached to the surface of the battery cell and is used to acquire the temperature signal of the battery cell; The heat acquisition unit is a thermistor. The first port of the thermistor is electrically connected to the terminal of the battery cell, and the second port of the thermistor is electrically connected to the electrode of the battery cell; or the first port of the thermistor is electrically connected to the electrode of the battery cell, and the second port of the thermistor is electrically connected to the terminal of the battery cell; or the first port of the thermistor is electrically connected to the power input terminal, and the second port of the thermistor is electrically connected to the power output terminal.
2. The battery assembly according to claim 1, characterized in that, The average thickness of the thermistor is greater than or equal to 5 nm and less than or equal to 5 μm.
3. The battery assembly according to claim 1, characterized in that, The heat collection unit covers at least one battery cell.
4. The battery assembly according to claim 1, characterized in that, At least two of the heat collection units are attached to the surface of each of the battery cells.
5. The battery assembly according to claim 1, characterized in that, At least two of the heat collection units are arranged in a uniform manner, or at least two of the heat collection units are arranged in a cluster manner.
6. The battery assembly according to claim 1, characterized in that, At least two of the heat collection units are connected in series, or at least two of the heat collection units are connected in parallel.
7. The battery assembly according to claim 1, characterized in that, Also includes: An analog-to-digital converter is provided, wherein the input terminal of the analog-to-digital converter is electrically connected to the thermal acquisition unit, and the output terminal of the analog-to-digital converter is electrically connected to the control module.
8. The battery assembly according to claim 6, characterized in that, Also includes: A fixed resistor is connected in series with the heat acquisition unit to form a voltage divider. The voltage divider is electrically connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter is electrically connected to the control module.
9. The battery assembly according to claim 1, characterized in that, Also includes: A control module is provided, which is used to detect the voltage of the heat acquisition unit and determine the temperature of the battery cell based on the voltage of the heat acquisition unit. The control module is also used to control the battery cell to stop charging or discharging when the temperature of the battery cell is greater than or equal to a first temperature threshold. Alternatively, the control module is used to detect the resistance value of the heat collection unit and determine the temperature of the battery cell based on the resistance value of the heat collection unit. The control module is also used to control the battery cell to stop charging or discharging when the temperature of the battery cell is greater than or equal to a first temperature threshold. Alternatively, the control module is used to detect the current of the heat acquisition unit and determine the temperature of the battery cell based on the current of the heat acquisition unit. The control module is also used to control the battery cell to stop charging or discharging when the temperature of the battery cell is greater than or equal to a first temperature threshold.