CN108511829A - A kind of lithium battery - Google Patents
A kind of lithium battery Download PDFInfo
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- CN108511829A CN108511829A CN201710108803.2A CN201710108803A CN108511829A CN 108511829 A CN108511829 A CN 108511829A CN 201710108803 A CN201710108803 A CN 201710108803A CN 108511829 A CN108511829 A CN 108511829A
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- Prior art keywords
- pressure sensor
- battery
- lithium battery
- battery according
- negative plate
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 24
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims description 9
- 239000011247 coating layer Substances 0.000 claims description 6
- 239000007770 graphite material Substances 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 2
- 229910052493 LiFePO4 Inorganic materials 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 230000002457 bidirectional effect Effects 0.000 claims 1
- 229910017052 cobalt Inorganic materials 0.000 claims 1
- 239000010941 cobalt Substances 0.000 claims 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000009530 blood pressure measurement Methods 0.000 abstract description 2
- 238000003487 electrochemical reaction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical group [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
Description
(一)技术领域(1) Technical field
本发明涉及一种锂电池，特别涉及一种内置压力传感器的锂电池。The invention relates to a lithium battery, in particular to a lithium battery with a built-in pressure sensor.
(二)背景技术(2) Background technology
锂电池具有电压高、比能量高、循环使用次数多、存储时间长等优点，不仅在便携式电子设备上(如移动电话、数码摄像机和手提电脑)得到广泛应用，而且也广泛应用于电动汽车、电动自行车以及电动工具等大中型电动设备方面，因此对锂离子电池的性能要求越来越高。锂电池的内部结构是由正负电极片和隔膜组成，电池在使用过程中会产生大量的热量，影响其电池的循环寿命和安全，尤其是对大容量电池的影响较大，电池内部产生大量热量后会导致整个电池膨胀产生形变，电池的侧壁将会受到形变压力。在现有技术中压力传感器可以直接测量待测点受到的压力大小，在电池中压力值能间接反应电池内部热量产生情况。电芯和外壳之间设置传感器来监测电池侧壁因温度的变化发生形变受到的压力，然而这与电芯的发热源的变化真实情况会存在一些滞后。因此，研究一种新型的内置传感器的锂电池已为急需。Lithium batteries have the advantages of high voltage, high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices (such as mobile phones, digital cameras, and laptops), but also widely used in electric vehicles, In terms of large and medium-sized electric equipment such as electric bicycles and electric tools, the performance requirements of lithium-ion batteries are getting higher and higher. The internal structure of a lithium battery is composed of positive and negative electrode sheets and a diaphragm. The battery will generate a lot of heat during use, which will affect the cycle life and safety of the battery, especially for large-capacity batteries. A large amount of heat will be generated inside the battery. The heat will cause the entire battery to expand and deform, and the side walls of the battery will be subject to deformation pressure. In the prior art, the pressure sensor can directly measure the pressure on the point to be measured, and the pressure value in the battery can indirectly reflect the heat generation inside the battery. A sensor is set between the battery cell and the casing to monitor the pressure on the side wall of the battery due to the deformation of the temperature change. However, there will be some lag between this and the actual change of the heat source of the battery cell. Therefore, it is urgent to study a new type of lithium battery with built-in sensors.
(三)发明内容(3) Contents of the invention
本发明针对上述现有技术的不足而提供一种能实现电池内部压力监测的锂电池。The present invention aims at the deficiencies of the above-mentioned prior art and provides a lithium battery capable of monitoring the internal pressure of the battery.
本发明为解决上述问题所采用的技术方案为：一种锂电池，包括电芯和外壳，电芯设置在外壳内，电芯包括正极片、负极片及隔膜，其特征在于所述正极片或负极片与隔膜之间设置有压力传感器。监测压力变化的压力传感器多种多样，然而用于电池内部压力检测的传感器需要更微小的尺寸，在传送高保真度压力测量值时，压力传感器与电池内极片紧密贴合，并不影响电池内的电化学反应过程。The technical solution adopted by the present invention to solve the above problems is: a lithium battery, including a battery cell and a casing, the battery cell is arranged in the casing, and the battery cell includes a positive electrode sheet, a negative electrode sheet and a separator, and is characterized in that the positive electrode sheet or the A pressure sensor is arranged between the negative electrode sheet and the diaphragm. There are many kinds of pressure sensors for monitoring pressure changes. However, the sensors used for battery internal pressure detection require a smaller size. When transmitting high-fidelity pressure measurements, the pressure sensor is closely attached to the battery's inner pole piece without affecting the battery. The electrochemical reaction process inside.
此外，本发明还具有如下优点及有益效果：In addition, the present invention also has the following advantages and beneficial effects:
1、能实时监测电芯内部的形变，及时反映电池的工作发热膨胀情况，提升电池使用的安全性并及时作出电池热失控事件的应对措施。1. It can monitor the internal deformation of the battery in real time, reflect the heating and expansion of the battery in a timely manner, improve the safety of battery use, and take timely countermeasures for battery thermal runaway events.
2.实现了对锂电池组的安全管理，增长了电池寿命。提供了安全管理策略和均衡管理，使电池保持较好的一致性，可有效提高电池的寿命。2. Realized the safe management of the lithium battery pack and increased the battery life. Provides safety management strategy and balance management to keep the battery consistent and effectively improve battery life.
本发明的特征在于所述压力传感器设置在正极片与隔膜之间。这样，可以直接检测到电池内部因温度过高发生热膨胀时正极片受到的压力值。The present invention is characterized in that the pressure sensor is arranged between the positive electrode sheet and the diaphragm. In this way, it is possible to directly detect the pressure value of the positive plate when the battery internal thermal expansion occurs due to excessive temperature.
本发明的特征还在于所述压力传感器设置在负极片与隔膜之间。这样，可以直接检测到电池内部因温度过高发生热膨胀时负极片受到的压力值。The present invention is also characterized in that the pressure sensor is arranged between the negative electrode sheet and the diaphragm. In this way, it is possible to directly detect the pressure value of the negative plate when the battery internal thermal expansion occurs due to excessive temperature.
本发明的特征还在于压力传感器的连接外线末端设置有接头。这样，方便与电池内各部件连接，当检测到的压力值超过阈值时，外部分析模块将会对电池充放电过程采取措施。The present invention is also characterized in that the end of the connecting external wire of the pressure sensor is provided with a joint. In this way, it is convenient to connect with various components in the battery. When the detected pressure value exceeds the threshold, the external analysis module will take measures for the charging and discharging process of the battery.
本发明的特征还在于压力传感器固定在正极片或负极片上。这样，不会让压力传感器发生位移，能有效的控制所需测量点的压力。The present invention is also characterized in that the pressure sensor is fixed on the positive electrode sheet or the negative electrode sheet. In this way, the pressure sensor will not be displaced, and the pressure at the required measuring point can be effectively controlled.
本发明的特征还在于所述压力传感器贯通正极片或负极片的两端。这样，压力传感器能接触到极片边缘至中心区域，就可以检测到整个极片的平均圧力。The present invention is also characterized in that the pressure sensor penetrates both ends of the positive electrode sheet or the negative electrode sheet. In this way, the pressure sensor can touch the edge of the pole piece to the central area, and the average pressure of the whole pole piece can be detected.
本发明的特征还在于所述压力传感器设置在正极片或负极片中心区域。极片中心区域一般是电池最易发热的部位，因此，将压力传感器设置在极片中心区域，可以将电池的压力变化，传递给控制中心，当压力达到阈值时，通过系统对电池采用相应的控制。The present invention is also characterized in that the pressure sensor is arranged in the central area of the positive electrode sheet or the negative electrode sheet. The center area of the pole piece is generally the part where the battery is most prone to heat. Therefore, setting the pressure sensor in the center area of the pole piece can transmit the pressure change of the battery to the control center. control.
本发明的特征还在于正极片涂布层的材料为磷酸铁锂、钴酸锂或三元材料。The present invention is also characterized in that the material of the positive plate coating layer is lithium iron phosphate, lithium cobaltate or ternary material.
本发明的特征还在于负极片涂布层的材料为石墨材料。The present invention is also characterized in that the material of the negative plate coating layer is graphite material.
(四)附图说明(4) Description of drawings
图1是本发明实施例1的示意图。Fig. 1 is a schematic diagram of Embodiment 1 of the present invention.
图2是压力传感器的结构示意图。Fig. 2 is a structural schematic diagram of the pressure sensor.
图3是压力传感器在锂电池中的位置示意图。Fig. 3 is a schematic diagram of the position of the pressure sensor in the lithium battery.
图4是本发明实施例2的示意图。Fig. 4 is a schematic diagram of Embodiment 2 of the present invention.
图5是图4的俯视图。FIG. 5 is a top view of FIG. 4 .
图6是本发明实施例3的示意图。Fig. 6 is a schematic diagram of Embodiment 3 of the present invention.
图中，1、电芯，2、外壳，3、正极片，4、负极片，5、隔膜，6、压力传感器，7、压力传感器连接引线，8、压力传感器接头，9、双向接口，10、内置端接口，11、外置端接口。In the figure, 1. Cell, 2. Shell, 3. Positive pole piece, 4. Negative pole piece, 5. Diaphragm, 6. Pressure sensor, 7. Pressure sensor connecting lead, 8. Pressure sensor connector, 9. Two-way interface, 10 , Built-in terminal interface, 11, External terminal interface.
(五)具体实施方式(5) Specific implementation methods
下面结合附图对本发明作进一步详细说明。The present invention will be described in further detail below in conjunction with the accompanying drawings.
如图1、2、3所示，一种锂电池，包括电芯1和外壳2，电芯1设置在外壳2内，电芯1包括正极片3、负极片4及隔膜5，隔膜5以Z字型卷绕方式将正极片3和负极片4绝缘隔开，正负极片上设置有极耳，外壳2包括壳顶和壳体，壳顶部设置有极柱和接口孔。如图1所述电芯1正极片3与隔膜5之间设置有压力传感器6，压力传感器6一端延伸至电池外可接入外部模块。As shown in Figures 1, 2, and 3, a lithium battery includes a cell 1 and a casing 2. The cell 1 is arranged in the casing 2. The cell 1 includes a positive electrode sheet 3, a negative electrode sheet 4, and a diaphragm 5. The diaphragm 5 is The positive electrode piece 3 and the negative electrode piece 4 are insulated and separated by the zigzag winding method, the positive and negative electrode pieces are provided with tabs, the shell 2 includes a shell top and a shell, and the shell top is provided with a pole and an interface hole. As shown in FIG. 1 , a pressure sensor 6 is provided between the positive plate 3 of the cell 1 and the diaphragm 5 , and one end of the pressure sensor 6 extends out of the battery and can be connected to an external module.
本发明的特征还在于如图4、5所示，电芯1包括正极片3、负极片4及隔膜5，隔膜5以Z字型卷绕方式将正极片3和负极片4绝缘隔开，正负极片上设置有极耳，所述负极片4与隔膜5之间设置有压力传感器6，压力传感器6一端延伸至电池外可接入外部模块。The present invention is also characterized in that as shown in Figures 4 and 5, the cell 1 includes a positive electrode sheet 3, a negative electrode sheet 4 and a diaphragm 5, and the diaphragm 5 insulates the positive electrode sheet 3 and the negative electrode sheet 4 in a zigzag winding manner, Tabs are provided on the positive and negative electrode sheets, and a pressure sensor 6 is provided between the negative electrode sheet 4 and the diaphragm 5, and one end of the pressure sensor 6 extends outside the battery to be connected to an external module.
如图3所示，本发明的特征还在于压力传感器6的连接引线7末端设置有接头8。As shown in FIG. 3 , the present invention is also characterized in that the end of the connecting lead 7 of the pressure sensor 6 is provided with a joint 8 .
本发明的特征还在于所述外壳2包括壳顶和壳体，壳顶的封口部位设置有封闭式的双向接口9，内置端接口10用于连接压力传感器6的接头8，外置端接口11用于与检测分析设备连接。The present invention is also characterized in that the shell 2 includes a shell top and a shell, and the sealing part of the shell top is provided with a closed two-way interface 9, the built-in end interface 10 is used to connect the joint 8 of the pressure sensor 6, and the external end interface 11 Used to connect with detection and analysis equipment.
本发明的特征还在于压力传感器6直接放置在正极片3或负极片4上。The present invention is also characterized in that the pressure sensor 6 is directly placed on the positive electrode sheet 3 or the negative electrode sheet 4 .
本发明的特征还在于压力传感器6固定在正极片3或负极片4上。The present invention is also characterized in that the pressure sensor 6 is fixed on the positive electrode sheet 3 or the negative electrode sheet 4 .
本发明的特征还在于所述压力传感器6贯通正极片3或负极片4的两端。The present invention is also characterized in that the pressure sensor 6 penetrates both ends of the positive electrode sheet 3 or the negative electrode sheet 4 .
本发明的特征还在于所述压力传感器6设置在正极片3或负极片4中心区域。The present invention is also characterized in that the pressure sensor 6 is arranged in the central area of the positive electrode sheet 3 or the negative electrode sheet 4 .
本发明的特征还在于正极片涂布层的材料为磷酸铁锂、钴酸锂或三元材料。The present invention is also characterized in that the material of the positive plate coating layer is lithium iron phosphate, lithium cobaltate or ternary material.
本发明的特征还在于负极片涂布层的材料为石墨材料。The present invention is also characterized in that the material of the negative plate coating layer is graphite material.
Claims (9)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710108803.2A CN108511829A (en) | 2017-02-27 | 2017-02-27 | A kind of lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710108803.2A CN108511829A (en) | 2017-02-27 | 2017-02-27 | A kind of lithium battery |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818091A (en) * | 2019-01-25 | 2019-05-28 | 深圳瑞隆新能源科技有限公司 | A kind of lithium ion battery |
| CN109830769A (en) * | 2019-01-25 | 2019-05-31 | 深圳瑞隆新能源科技有限公司 | A kind of polymer Li-ion battery |
| CN111554992A (en) * | 2020-06-02 | 2020-08-18 | 东莞新能德科技有限公司 | Battery cell, battery and electronic equipment |
| CN111710926A (en) * | 2020-06-24 | 2020-09-25 | 电子科技大学 | Informationized electrochemical energy storage device and its management and control method and system |
| CN112034358A (en) * | 2020-08-04 | 2020-12-04 | 上汽大众汽车有限公司 | Lithium battery thermal runaway detection system and method |
| CN113258178A (en) * | 2020-02-12 | 2021-08-13 | 比亚迪股份有限公司 | Battery, battery module, battery pack and electric vehicle |
| WO2021159994A1 (en) * | 2020-02-12 | 2021-08-19 | 比亚迪股份有限公司 | Battery, battery module, battery pack and electric vehicle |
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| CN109818091B (en) * | 2019-01-25 | 2021-06-08 | 三亚佳瑞新能源科技有限责任公司 | Lithium ion battery |
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| CN111710926A (en) * | 2020-06-24 | 2020-09-25 | 电子科技大学 | Informationized electrochemical energy storage device and its management and control method and system |
| CN112034358A (en) * | 2020-08-04 | 2020-12-04 | 上汽大众汽车有限公司 | Lithium battery thermal runaway detection system and method |
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