CN218973673U - Battery cell temperature measuring device and battery cell - Google Patents
Battery cell temperature measuring device and battery cell Download PDFInfo
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- CN218973673U CN218973673U CN202222781678.0U CN202222781678U CN218973673U CN 218973673 U CN218973673 U CN 218973673U CN 202222781678 U CN202222781678 U CN 202222781678U CN 218973673 U CN218973673 U CN 218973673U
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- 239000011247 coating layer Substances 0.000 claims abstract description 21
- 238000005260 corrosion Methods 0.000 claims abstract description 19
- 239000003792 electrolyte Substances 0.000 claims abstract description 17
- 238000012806 monitoring device Methods 0.000 claims abstract description 12
- 230000007797 corrosion Effects 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 64
- 238000009529 body temperature measurement Methods 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 239000002985 plastic film Substances 0.000 claims description 8
- 229920006255 plastic film Polymers 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 239000003292 glue Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000011076 safety test Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model belongs to the technical field of batteries, and discloses a battery cell temperature measuring device and a battery cell. The battery cell temperature measuring device comprises a temperature sensor and a coating layer, wherein the temperature sensor is arranged in the battery cell and is in communication connection with an external monitoring device; the coating layer is coated on the outer wall of the temperature sensor and can be fixed at a temperature measuring point on the battery cell, and the coating layer can resist corrosion of electrolyte. The battery cell temperature measuring device can measure temperature from the inside of the battery cell, is suitable for battery cells with different structures, can protect the temperature sensor from being corroded by electrolyte, and improves the service life and reliability of the battery cell temperature measuring device.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery cell temperature measuring device and a battery cell.
Background
The lithium ion battery is used as clean energy, has high mass specific energy, can be repeatedly used, has no pollution, accords with the strategy of sustainable development, has the characteristics of high energy, high power, high energy density and the like, and particularly has rapid development in the field of new energy automobiles. Temperature is an important index for evaluating electrical performance, safety performance and service life of a battery, and the temperature outside the battery is easily obtained, while it is difficult to monitor the temperature change inside the battery. There are several methods for measuring the internal temperature of a battery: 1. the temperature test paper method can only be estimated macroscopically, and cannot obtain visual, fine and real-time temperature data; 2. the temperature model method needs to collect a large amount of data to build a model, is only applicable to a fixed system, and is not applicable to products in the development stage of a possible transformation system; 3. the punching lead testing method is not suitable for the aluminum plastic film soft package structure battery.
In the method for measuring the internal temperature of the thermocouple, the temperature sensor is adopted to directly measure the temperature by adopting a side seal position lead-out thermocouple wire after the thermocouple is sealed by using tab glue, and the patent number is 201610786430. X. The method has the limitation that the method is only suitable for soft package batteries with double edge sealing structures, and the method can not be used for measuring the temperature of batteries with different-side tab structures with single edge sealing structures.
The main flow of the traditional power battery has a flexible battery structure which is a different-direction tab structure and is mostly a battery with a single edge sealing structure, one side is a folded side, the other side is an air bag side, the internal temperature change of the battery cannot be directly measured and monitored by adopting the traditional battery core temperature measuring method, and a temperature sensor in the traditional temperature measuring method is directly contacted with electrolyte in the battery core, so that the temperature sensor is easily corroded by the electrolyte in the battery, and the sensor is invalid and temperature measuring data are abnormal.
Disclosure of Invention
The utility model aims to provide a battery cell temperature measuring device which can measure temperature from the inside of a battery cell, is suitable for battery cells with different structures, can protect a temperature sensor from being corroded by electrolyte, and improves the service life of the device and the reliability of the device.
To achieve the purpose, the utility model adopts the following technical scheme:
the battery cell temperature measuring device comprises a temperature sensor and a coating layer, wherein the temperature sensor is arranged in the battery cell and is in communication connection with an external monitoring device; the coating layer is coated on the outer wall of the temperature sensor and can be fixed at a temperature measuring point on the battery cell, and the coating layer can resist corrosion of electrolyte.
Optionally, the cladding layer includes a first fixed layer and a second fixed layer which are oppositely disposed, the first fixed layer and the second fixed layer are mutually attached and sealed, the temperature sensor is sandwiched between the first fixed layer and the second fixed layer, the coverage area of the first fixed layer is larger than the coverage area of the second fixed layer, and the inner wall surface of the first fixed layer is sealed and attached to a temperature measurement point on the battery cell.
Optionally, a first anti-corrosion layer is adhered to the outside of the first fixing layer.
Optionally, a second anti-corrosion layer is adhered outside the second fixing layer.
Optionally, the coating layer is a flexible member.
Optionally, the coating layer is square or round.
Optionally, a connection lead is provided on the temperature sensor, and the connection lead is led out from an end wall of the battery cell, where the tab is provided, and is connected with the external monitoring device.
Optionally, the temperature measuring points and the temperature sensors are provided in plurality, the temperature measuring points are arranged at intervals, and the temperature sensors are fixed on the temperature measuring points in a one-to-one correspondence manner.
Optionally, the temperature measuring point comprises an outer wall point of the battery cell, a point between a pole piece and a diaphragm of the battery cell, and a point at a joint of a pole lug and a pole piece of the battery cell.
Another object of the present utility model is to provide a battery cell, which includes an aluminum plastic film, a core pack and the battery cell temperature measuring device according to any one of the above schemes, wherein the core pack and the battery cell temperature measuring device are both disposed in the aluminum plastic film, and the battery cell temperature measuring device is disposed on at least one of an outer wall of the core pack, between a pole piece and a diaphragm in the core pack, and a junction between a pole tab and a pole piece of the core pack.
The beneficial effects are that:
according to the battery cell temperature measuring device, the temperature is measured through the temperature sensor in the battery cell, and the temperature sensor is covered by the electrolyte corrosion-resistant coating layer, so that the temperature sensor is protected, the temperature sensor is prevented from being corroded and damaged by the electrolyte, the reliability of the battery cell temperature measuring device is improved, and the service life of the battery cell temperature measuring device is prolonged; the temperature sensor is in communication connection with the external monitoring device, and the measured temperature information is directly transmitted to the external monitoring device, so that the temperature sensor is suitable for the battery cells with different structures, other temperature measuring pieces are not introduced, the integral sealing structure of the battery cells is not damaged, the influence on the structure of the battery cells is reduced, and the test data has true reliability.
Drawings
FIG. 1 is a schematic diagram of a cell temperature measurement device according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of another view angle of the battery cell temperature measurement device according to the embodiment of the present utility model;
FIG. 3 is a schematic diagram of a battery cell temperature measurement device according to an embodiment of the present utility model installed in a battery cell;
FIG. 4 is a schematic diagram of a packaged battery cell according to an embodiment of the present utility model;
fig. 5 is a schematic structural diagram of the inside of a packaged battery cell according to an embodiment of the present utility model;
fig. 6 is a schematic diagram of a packaged battery cell according to an embodiment of the present utility model.
In the figure:
1. the battery cell temperature measuring device; 10. a temperature sensor; 11. connecting leads; 21. a first fixed layer; 22. a second fixed layer; 23. a first corrosion protection layer; 24. a second anti-corrosion layer;
3. a battery cell; 31. an aluminum plastic film; 32. an air bag; 33. a pole piece; 331. a positive plate; 332. a negative electrode sheet; 34. a tab; 35. a diaphragm; 36. a lead hole; 37. and (5) sealing glue.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
Referring to fig. 1 and 3, in the present embodiment, the battery cell temperature measuring device 1 includes a temperature sensor 10 and a coating layer, the temperature sensor 10 is disposed inside the battery cell 3, and the temperature sensor 10 is communicatively connected to an external monitoring device (not shown); the coating layer is coated on the outer wall of the temperature sensor 10 and can be fixed at a temperature measurement point on the battery cell 3, and the coating layer can resist corrosion of electrolyte.
The battery cell temperature measuring device 1 in the embodiment measures the temperature through the temperature sensor 10 in the battery cell 3, and the temperature sensor 10 is protected by wrapping the temperature sensor 10 with the electrolyte corrosion resistant wrapping layer, so that the temperature sensor 10 is prevented from being corroded and damaged by the electrolyte, and the reliability and the service life of the battery cell temperature measuring device 1 are improved; the temperature sensor 10 is in communication connection with an external monitoring device, and directly transmits measured temperature information to the external monitoring device, so that the temperature sensor is suitable for the battery cells 3 with different structures.
With reference to fig. 2 and 3, in this embodiment, optionally, the coating layer includes a first fixing layer 21 and a second fixing layer 22 that are disposed opposite to each other, the first fixing layer 21 and the second fixing layer 22 are bonded and sealed, the temperature sensor 10 is disposed between the first fixing layer 21 and the second fixing layer 22, a coverage area of the first fixing layer 21 is larger than a coverage area of the second fixing layer 22, and an inner wall surface of the first fixing layer 21 is sealed and adhered to a temperature measurement point in the battery cell 3. The temperature sensor 10 is coated and protected through the first fixing layer 21 and the second fixing layer 22, the temperature sensor 10 and the second fixing layer 22 are fixed on the temperature measuring point inside the battery cell 3 through the first fixing layer 21 with larger area, the inside temperature sensor 10 can be contained in a closed containing cavity, the electrolyte is prevented from being corroded, and the structure is simple and the fixing is reliable.
As a preferred embodiment, the first fixing layer 21 is externally attached with a first anti-corrosion layer 23. Further, a second anti-corrosion layer 24 is attached to the second fixing layer 22. The first anti-corrosion layer 23 and the second anti-corrosion layer 24 can prevent the first fixing layer 21 and the second fixing layer 22 from being corroded by electrolyte, further protect the internal temperature sensor 10, and improve the reliability and the service life of the cell temperature measuring device 1.
Optionally, the coating is flexible to prevent the coating from puncturing the pole piece 33 and the diaphragm 35 when the temperature sensor 10 is placed. Further, the coating layer is square or round, and in this embodiment, the coating layer is selected to be square, but not limited to square, and the other shapes can be used, which is not particularly limited herein. In the present embodiment, the first and second fixing layers 21 and 22 are made of polypropylene, and the first and second anticorrosive layers 23 and 24 are made of polytetrafluoroethylene, so that the coating layer can withstand not only corrosion by the electrolyte but also high temperatures of 100 to 250 ℃. The total thickness of the first fixing layer 21 and the first anti-corrosion layer 23 and the total thickness of the second fixing layer 22 and the second anti-corrosion layer 24 are 0.09mm to 0.11mm, so that the coating layer does not influence the measurement of temperature, the width of the first fixing layer 21 is 7mm to 10mm, the width of the second fixing layer 22 is 4mm to 6mm, and the first fixing layer 21 is at least 3mm wider than the second fixing layer 22, thereby ensuring that the first fixing layer 21 has a sufficient area to adhesively fix the cell temperature measuring device 1 in the cell 3.
With continued reference to fig. 2 to 4, the temperature sensor 10 is provided with a connection lead 11, and the connection lead 11 is led out from an end wall of the battery cell 3 provided with the tab 34 and connected to the external monitoring device. When the battery cell 3 is not packaged and formed, the connecting leads 11 are led out from the side edges where the electrode lugs 34 are located, as shown in fig. 3, the battery cell 3 with the battery cell temperature measuring device 1 mounted at the moment is not packaged, the air bags 32 are positioned on one side of the battery cell 3, and after packaging is completed, as shown in fig. 4, all the connecting leads 11 are mutually arranged at intervals and are mutually parallel, are led out from one side edge of the battery cell 3 including the electrode lugs 34, and the electrode lugs 34 and the connecting leads 11 are packaged together, so that the original processing procedure of the battery cell 3 is not changed, unnecessary equipment is not added, the packaging difficulty of the battery cell 3 can be reduced, the battery cell 3 with the battery cell temperature measuring device 1 is convenient to process, and the processing cost is reduced. The wire diameter of the connecting lead 11 is 0.05mm to 0.2mm, and the thickness of the battery cell 1 and the subsequent processing are not affected.
As shown in fig. 3 and 4, a plurality of temperature measuring points and the temperature sensors 10 are provided, the plurality of temperature measuring points are arranged at intervals, and the plurality of temperature sensors 10 are fixed on the plurality of temperature measuring points in a one-to-one correspondence manner. Further, the temperature measuring points comprise the point of the outer wall of the core package of the battery cell 3, the point between the pole piece 33 and the diaphragm 35 of the battery cell 3 and the point of the joint of the pole lug 34 and the pole piece 33 of the battery cell 3. The core package is an assembly formed by stacking or winding the pole piece 33 and the diaphragm 35, the pole piece 33 may be the positive pole piece 331 or the negative pole piece 332, the tab 34 may be the positive pole piece or the negative pole piece, further, the connection between the tab 34 and the pole piece 33 may be understood as a welding area between the tab 34 and the pole piece 33, and the outer wall of the core package may be the outer wall of the positive pole piece 331, the negative pole piece 332 or the diaphragm 35 according to the actual stacking sequence of the assembly, which is well known to those skilled in the art and is not repeated herein. All three points can be provided with a plurality of points to realize comprehensive temperature measurement of the inside of the battery cell 3, the points can be positioned on different sides of the pole piece 33 or the diaphragm 35, and specific point positions and quantity selection are determined by the temperature measurement requirement of the battery cell 3 and are not repeated here.
Specifically, as shown in fig. 4, in this embodiment, the above-mentioned electric core temperature measuring devices 1 are all disposed on the pole piece 33, at the connection position between the pole lug 34 and the pole piece 33, and on the outer wall of the core pack (the electric core temperature measuring devices 1 on the outer wall of the core pack are not shown in the figure), and at least two electric core temperature measuring devices 1 are disposed at different positions on the plane where each point is located, so that the inside and the outside of the electric core 3 are measured in an omnibearing manner, the measurement result is more accurate and reliable, and the operation condition of the electric core 3 is convenient to be comprehensively analyzed. The electrode sheet 33 may be the positive electrode sheet 331 or the negative electrode sheet 332 (see fig. 5), and the cell temperature measuring device 1 may be disposed between the separator 35 and the positive electrode sheet 331 or between the separator 35 and the negative electrode sheet 332, which is not particularly limited.
As shown in fig. 6, the outer shell of the plastic-aluminum film 31 of the battery core 3 is further provided with a plurality of lead holes 36, the plurality of lead holes 36 are arranged at intervals along the horizontal direction, the lead holes 36 are 5 to 20mm away from the seal edge of the plastic-aluminum film 31, the overall aesthetic degree of the battery core 3 can be improved, and the lead holes 36 are coated with sealant 37 to seal the lead holes 36 and prevent electrolyte from flowing out. The sealant 37 is one of AB glue, UV glue, or epoxy resin, and is not particularly limited herein.
The embodiment also provides a battery cell, which comprises an aluminum plastic film 31, a core package and the battery cell temperature measuring device 1 according to any one of the above schemes, wherein the core package and the battery cell temperature measuring device 1 are both arranged in the aluminum plastic film 31, and the battery cell temperature measuring device 1 is arranged on at least one of the outer wall of the core package, between a pole piece 33 and a diaphragm 35 in the core package, and at the joint of a pole lug 34 and the pole piece 33 of the core package. When the electrical core 3 is used for electrical performance test and safety test, the external monitoring device is directly connected with the temperature sensor 10, so that the internal temperature change of the battery can be measured in real time. The internal battery cell temperature measuring device 1 can be compatible with soft package battery cells 3 with different structures, the method is simple, the materials are easy to obtain, other temperature measuring pieces are not introduced, the whole sealing structure of the battery cells 3 is not damaged, the influence on the structure of the battery cells 3 is reduced, and the test data has real reliability. And the temperature sensor 10 is coated with a coating layer, so that the temperature sensor 10 can be fixed, the temperature sensor 10 can be prevented from being corroded by electrolyte to cause the failure of a temperature measuring point, and the reliability and the service life of the battery cell temperature measuring device 1 are improved.
It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (10)
1. Electric core temperature measuring device, its characterized in that includes:
the temperature sensor (10) is arranged inside the battery cell (3), and the temperature sensor (10) is in communication connection with an external monitoring device;
the coating layer is coated on the outer wall of the temperature sensor (10) and can be fixed on a temperature measuring point on the battery cell (3), and the coating layer can resist corrosion of electrolyte.
2. The battery cell temperature measuring device according to claim 1, wherein the coating layer comprises a first fixing layer (21) and a second fixing layer (22) which are oppositely arranged, the first fixing layer (21) and the second fixing layer (22) are mutually attached and sealed, the temperature sensor (10) is clamped between the first fixing layer (21) and the second fixing layer (22), the coverage area of the first fixing layer (21) is larger than that of the second fixing layer (22), and the inner wall surface of the first fixing layer (21) is sealed and attached to a temperature measuring point in the battery cell (3).
3. The cell temperature measuring device according to claim 2, wherein the first fixing layer (21) is externally attached with a first anti-corrosion layer (23).
4. A cell temperature measuring device according to claim 3, characterized in that the second fixing layer (22) is externally provided with a second anti-corrosion layer (24).
5. The cell temperature measurement device of any one of claims 1-4, wherein the coating is a flexible member.
6. The cell temperature measurement device of any one of claims 1-4, wherein the coating is square or circular.
7. The cell temperature measuring device according to claim 1, characterized in that a connection lead (11) is provided on the temperature sensor (10), the connection lead (11) being led out from the end wall of the cell (3) provided with the tab (34) and being connected with the external monitoring device.
8. The cell temperature measuring device according to claim 1, wherein a plurality of temperature measuring points and the temperature sensors (10) are arranged at intervals, and the temperature sensors (10) are fixed on the temperature measuring points in a one-to-one correspondence manner.
9. The cell temperature measurement device according to claim 8, wherein the temperature measurement point comprises at least one of a core-package outer wall point of the cell (3), a point between a pole piece (33) and a diaphragm (35) of the cell (3), and a point at a junction of a tab (34) of the cell (3) and the pole piece (33).
10. The battery cell is characterized by comprising an aluminum plastic film (31), a core pack and the battery cell temperature measuring device (1) according to any one of claims 1-9, wherein the core pack and the battery cell temperature measuring device (1) are both arranged in the aluminum plastic film (31), and the battery cell temperature measuring device (1) is arranged on at least one of the outer wall of the core pack, between a pole piece (33) and a diaphragm (35) in the core pack and at the joint of a pole lug (34) and the pole piece (33) of the core pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222781678.0U CN218973673U (en) | 2022-10-21 | 2022-10-21 | Battery cell temperature measuring device and battery cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222781678.0U CN218973673U (en) | 2022-10-21 | 2022-10-21 | Battery cell temperature measuring device and battery cell |
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| Publication Number | Publication Date |
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| CN218973673U true CN218973673U (en) | 2023-05-05 |
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|---|---|---|---|
| CN202222781678.0U Active CN218973673U (en) | 2022-10-21 | 2022-10-21 | Battery cell temperature measuring device and battery cell |
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| CN (1) | CN218973673U (en) |
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2022
- 2022-10-21 CN CN202222781678.0U patent/CN218973673U/en active Active
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