WO2020147146A1 - 锂离子电池及其内部电流分布检测装置 - Google Patents

锂离子电池及其内部电流分布检测装置 Download PDF

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Publication number
WO2020147146A1
WO2020147146A1 PCT/CN2019/073222 CN2019073222W WO2020147146A1 WO 2020147146 A1 WO2020147146 A1 WO 2020147146A1 CN 2019073222 W CN2019073222 W CN 2019073222W WO 2020147146 A1 WO2020147146 A1 WO 2020147146A1
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lithium ion
ion battery
current
positive
negative
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English (en)
French (fr)
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李哲
王成煜
张剑波
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Tsinghua University
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Tsinghua University
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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/28—Electrolytic cell components
    • 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
    • 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
    • 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

Definitions

  • This application relates to the field of power energy technology, and in particular to a lithium ion battery and its internal current distribution detection device.
  • a related technical solution is to design the lithium ion battery as a battery with ten positive electrodes and one negative electrode.
  • a multi-channel measuring unit measures the current flowing from each anode. This solution can only detect the current distribution within the battery plane, but cannot detect the current distribution between the battery layers.
  • a lithium ion battery and its internal current distribution detection device are provided, which can detect the current distribution between layers of the battery.
  • a device for detecting current distribution inside a lithium ion battery including:
  • a lithium ion battery includes a plurality of positive electrode plates, a plurality of negative electrode plates, a plurality of positive electrode tabs, and a plurality of negative electrode tabs.
  • the plurality of positive electrode tabs are spaced from the plurality of negative electrode tabs, and each positive electrode tab is connected to a positive electrode tab
  • Each negative plate is connected to a negative ear;
  • a battery tester electrically connected to the lithium ion battery, for controlling the charging and discharging process of the lithium ion battery;
  • a plurality of current detectors each current detector being connected to one of the positive ears or one of the negative ears, for detecting the current of each of the positive plates or each of the negative plates.
  • a lithium ion battery including:
  • a plurality of negative plates which are spaced apart from the plurality of positive plates;
  • each positive lug is electrically connected to one of the positive tabs;
  • a plurality of negative electrode ears each of which is electrically connected to one of the negative electrode tabs;
  • a plurality of separators each separator is arranged between the positive electrode sheet and the negative electrode sheet, and the length of the separator is greater than the length of the negative electrode lug, and the length of the separator is greater than the length of the positive electrode lug.
  • the application provides a lithium ion battery and a device for detecting current distribution in the same.
  • the device for detecting current distribution inside the lithium ion battery includes a lithium ion battery, a battery tester and a plurality of current detectors.
  • the lithium ion battery includes a plurality of positive electrode plates and a plurality of negative electrode plates. Each positive electrode plate is connected to a positive electrode ear, and each negative electrode plate is connected to a negative electrode ear.
  • the battery tester controls the charging and discharging process of the lithium ion battery.
  • Each of the current detectors is connected with a lug sensor for detecting the current of each positive electrode or each negative electrode.
  • the multiple current detectors in the device for measuring the current distribution between layers within a lithium ion battery provided by the present application detect the current distribution between the layers of the battery by detecting the current on the line where each tab is located.
  • FIG. 1 is a diagram of a device for detecting current distribution inside a lithium ion battery according to an embodiment of the application
  • FIG. 2 is a diagram of a device for detecting current distribution inside a lithium-ion battery provided by an embodiment of the application;
  • FIG. 3 is a connection diagram of a power supply mode of a battery tester provided by an embodiment of the application.
  • FIG. 4 is a structural diagram of a lithium ion battery provided by an embodiment of the application.
  • Lithium-ion battery internal current distribution detection device 100 Lithium-ion battery internal current distribution detection device 100
  • an element when referred to as being “disposed on” another element, it may be directly on the other element or there may be a centered element.
  • an element When an element is considered to be “connected” to another element, it may be directly connected to another element or there may be a centered element at the same time.
  • an embodiment of the present application provides a device 100 for detecting current distribution inside a lithium ion battery.
  • the device 100 for detecting current distribution within a lithium ion battery includes a lithium ion battery 40, a battery tester 50 and a plurality of current detectors 20.
  • the lithium ion battery 40 includes a plurality of positive electrodes 41, a plurality of negative electrodes 42 and a plurality of tabs 43.
  • the plurality of tabs 43 includes a plurality of positive tabs 431 and a plurality of negative tabs 432.
  • Each positive tab 41 is connected to a positive lug 431.
  • Each negative tab 42 is connected to a negative tab 432.
  • the battery tester 50 is electrically connected to the lithium ion battery 40.
  • the battery tester 50 is used to control the charging and discharging process of the lithium ion battery 40.
  • the battery detector 50 can be used to control the current or voltage of the lithium ion battery 40 during the charging and discharging process.
  • each of the current detectors 20 is inductively connected to one of the tabs 43. It can be understood that the plurality of current detectors 20 may be optical fiber sensors or Hall current sensors. The detection accuracy of the plurality of current detectors 20 may be 1%. The plurality of current detectors 20 are used to detect the current of each positive electrode plate 41 or the current of each negative electrode plate 42.
  • the positive electrode sheet 41 can be prepared by the following method. First, put the positive electrode active material, the positive electrode solvent, the positive electrode binder, and the positive electrode conductive agent into a mixer for stirring, so as to prepare a preliminary positive electrode slurry. Then, the primary positive electrode slurry is dried and rolled to form the positive electrode sheet 41.
  • the negative electrode sheet 42 can be prepared by the following method. First, the negative electrode active material, the negative electrode solvent, the negative electrode binder and the negative electrode conductive agent are put into a mixer and stirred to prepare a preliminary negative electrode slurry. Then, the primary negative electrode slurry is dried and rolled to form the negative electrode sheet 42.
  • the material of the plurality of tabs 43 may be aluminum sheet or nickel sheet. Each of the positive electrode tabs 41 and each of the positive electrode ears 431 may be connected by welding. Each of the negative electrode tabs 42 and each of the negative electrode ears 432 may be connected by welding.
  • the device 100 for detecting the internal current distribution of the lithium ion battery includes the lithium ion battery 40, the battery tester 50 and the multiple current detectors 30.
  • the lithium ion battery 40 includes the plurality of positive electrode sheets 41 and the plurality of negative electrode sheets 42. Each positive tab 41 is connected to one positive lug 431, and each negative tab 42 is connected to one negative lug 432.
  • the battery tester 50 is used to control the charging and discharging process of the lithium ion battery 40.
  • Each of the current detectors 20 is inductively connected to one of the tabs 43. Each of the current detectors 20 can be used to detect the current of each of the positive tabs 41 or the current of each of the negative tabs 42.
  • the multiple current detectors 20 in the device 100 for measuring the current distribution between layers within a lithium ion battery provided in the present application detect the current distribution between the layers of the battery by detecting the current on the line where each tab 43 is located.
  • the positive electrode sheet 41 and the negative electrode sheet 42 are spaced apart, and the lithium ion battery 40 further includes a plurality of separators 44.
  • Each of the separators 44 is arranged between the positive electrode sheet 41 and the negative electrode sheet 42. Moreover, the length of the separator 44 is greater than the length of the negative electrode sheet 42, and the length of the separator 44 is greater than the length of the positive electrode sheet 41.
  • the diaphragm 44 may be a polymer film with a microporous structure. Lithium ions can pass through the microporous structure, but electrons cannot pass through the microporous structure. The arrangement of the separator 44 can ensure that the positive electrode sheets 41 and the negative electrode sheets 42 are insulated from each other.
  • the lithium ion battery 40 further includes an aluminum plastic film 45.
  • the aluminum plastic film 45 has a receiving space 451.
  • the aluminum plastic film 45 accommodates the plurality of positive electrodes 41, the plurality of negative electrodes 42 and the plurality of separators 44 in the storage space 451. Wherein, in the direction in which the diaphragm 44 extends, both ends of the diaphragm 44 are in contact with the aluminum plastic film 45. That is, the length of the diaphragm 44 is extended to the sealing edge of the aluminum plastic film 45.
  • the arrangement of the separator 44 can ensure that each of the positive electrode sheets 41 and each of the negative electrode sheets 42 are insulated from each other.
  • the length of the diaphragm 44 can be extended to the sealing edge of the aluminum-plastic film 45, which can effectively prevent the tabs 43 from communicating with each other before extending from the aluminum-plastic film 45.
  • the device 100 for detecting current distribution inside the lithium ion battery further includes a plurality of current clips 30.
  • Each current clip 30 is electrically connected to one of the tabs 43.
  • One current clip 30 is connected to one current lead 31.
  • One of the current clamps 30 and one of the current detectors 20 are inductively connected through a current lead 31.
  • the length and diameter of each current lead 31 are equal.
  • the internal resistance of the current lead 31 accounts for 0-1% of the positive electrode sheet 41 or the negative electrode sheet 42.
  • each of the current leads 31 may have a diameter of 4 mm and a length of 66 cm.
  • the resistance of each current lead can be calculated to be 0.92m ⁇ .
  • the internal resistance of the lithium ion battery 40 is on the order of 100 m ⁇ , and the internal resistance of the current lead 31 accounts for 0.92% of the positive electrode 41 or the negative electrode 42.
  • the length and diameter of the current lead 31 are the same.
  • the length of the current lead 31 can be as short as possible, and the shorter current lead 31 can effectively prevent the resistance difference between the current leads 31 from affecting the accuracy of the current distribution between the layers of the lithium ion battery 40.
  • the device 100 for detecting current distribution within the lithium ion battery further includes a power supply device 10.
  • the power supply device 10 adopts a dual-circuit power supply mode to provide electrical energy to the Hall sensor.
  • the power supply device 10 adopts a dual power supply mode.
  • the power supply device 10 includes a positive terminal 11, a negative terminal 12 and a ground terminal 13.
  • the current detector 20 includes a first terminal 21, a second terminal 22, a third terminal 23 and a fourth terminal 24.
  • the positive terminal 11 is electrically connected to the first terminal 21, the negative terminal 12 is electrically connected to the second terminal 22, and the ground terminal 13 is electrically connected to the third terminal 23.
  • the fourth terminal 24 is a signal output terminal.
  • the fourth terminal 24 is electrically connected to the ground terminal 13 through a load, and is used to ensure that the output voltage signal is zero when the detected current is zero.
  • the power supply device 10 adopts a dual power supply mode to ensure the reliability of power supply.
  • the lithium ion battery 40 includes a plurality of positive electrodes 41, a plurality of negative electrodes 42, a plurality of tabs 43, and a plurality of separators 44.
  • the plurality of tabs 43 include a positive tab 431 and a negative tab 432.
  • the plurality of negative electrodes 42 and the plurality of positive electrodes 41 are spaced apart. Each positive lug 431 is electrically connected to one positive tab 41. Each negative tab 432 is electrically connected to one negative tab 42. Each of the separators 44 is arranged between the positive electrode sheet 41 and the negative electrode sheet 42. Moreover, the length of the separator 44 is greater than the length of the negative electrode sheet 42. The length of the separator 44 is greater than the length of the positive electrode sheet 41. In one embodiment, the length of the separator 44 is greater than the length of the negative electrode sheet 42, and the length of the negative electrode sheet 42 is greater than the length of the positive electrode sheet 41.
  • the positive electrode sheet 41 can be prepared by the following method. First, put the positive electrode active material, the positive electrode solvent, the positive electrode binder, and the positive electrode conductive agent into a mixer for stirring, so as to prepare a preliminary positive electrode slurry. Then, the primary positive electrode slurry is dried and rolled to form the positive electrode sheet 41.
  • the negative electrode sheet 42 can be prepared by the following method. First, the negative electrode active material, the negative electrode solvent, the negative electrode binder, and the negative electrode conductive agent are put into a mixer and stirred to prepare a preliminary negative electrode slurry. Then, the primary negative electrode slurry is dried and rolled to form the negative electrode sheet 42.
  • the material of the plurality of tabs 43 may be aluminum sheet or nickel sheet.
  • Each of the positive electrode tabs 41 and each of the positive electrode ears 431 may be connected by welding.
  • Each of the negative electrode tabs 42 and each of the negative electrode ears 432 may be connected by welding.
  • the diaphragm 44 may be a polymer film with a microporous structure. Lithium ions can pass through the microporous structure, but electrons cannot pass through the microporous structure. The arrangement of the separator 44 can ensure that the positive electrode sheets 41 and the negative electrode sheets 42 are insulated from each other.
  • the lithium ion battery 40 is electrically connected to the positive electrode tab 431 on each of the positive electrode tabs 41 and is electrically connected to the negative electrode tab 432 on each of the negative electrode tabs 42.
  • Such a design solution can realize the purpose of detecting the physical quantity distribution inside the lithium ion battery 40 by connecting a current detection device or other physical quantity detection device in series with the positive ear 431 or the negative ear 432.
  • the arrangement of the separator 44 can ensure that the positive electrode sheets 41 and the negative electrode sheets 42 are insulated from each other.
  • the lithium ion battery 40 further includes an aluminum plastic film 45.
  • An aluminum plastic film 45 may be formed on the plurality of positive electrode sheets 41, the plurality of negative electrode sheets 42 and the plurality of separators 44 through a stamping process. In the direction in which the diaphragm 44 extends, both ends of the diaphragm 44 are in contact with the aluminum plastic film 45. That is, the length of the diaphragm 44 can be extended to the sealing edge of the aluminum plastic film 45.
  • the arrangement of the separator 44 can ensure that each of the positive electrode sheets 41 and each of the negative electrode sheets 42 are insulated from each other.
  • the length of the diaphragm 44 can be extended to the sealing edge of the aluminum-plastic film 45, and the length of the diaphragm 44 can effectively prevent the tabs 43 from communicating with each other before extending from the aluminum-plastic film 45.

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Abstract

一种锂离子电池内部电流分布检测装置（100），包括：锂离子电池（40）、电池测试仪（50）和多个电流检测器（20）。锂离子电池（40）包括多个正极片（41）和多个负极片（42），每个正极片（41）都连接一个正极耳（431），每个负极片（42）都连接一个负极耳（432）。电池测试仪（50）控制锂离子电池（40）的充放电过程。每个电流检测器（20）与一个极耳（431，432）感接，用于检测每个正极片（41）或每个负极片（42）的电流。锂离子电池内部电流分布检测装置（100）中的多个电流检测器（20）通过检测每个极耳（431，432）所在线路上的电流进而检测电池（40）的层间电流分布情况。还提供一种锂离子电池（40）。

Description

锂离子电池及其内部电流分布检测装置
相关申请
本申请要求2019年1月14日申请的，申请号为201910032661.5，名称为“锂离子电池及其内部电流分布检测电路”的中国专利申请的优先权，在此将其全文引入作为参考。
技术领域
本申请涉及动力能源技术领域，特别是涉及一种锂离子电池及其内部电流分布检测装置。
背景技术
电动汽车的发展对锂离子电池的能量密度提出了更高的要求。然而，电池大型化后电流的不均匀分布更加明显，导致电池的能量密度损失严重。
为了研究锂离子电池内部电流的分布，相关的技术方案为将锂离子电池设计成具有十个正极一个负极的电池。通过一个多通道测量单元测量从各个正极流出的电流。此种方案只能检测电池面内电流分布，不能检测电池的层间电流分布。
发明内容
基于此，提供一种锂离子电池及其内部电流分布检测装置，可以检测电池的层间电流分布情况。
一种锂离子电池内部电流分布检测装置，包括：
锂离子电池，包括多个正极片、多个负极片、多个正极耳和多个负极耳，所述多个正极片与所述多个负极片间隔设置，每个正极片连接一个正极耳，每个负极片连接一个负极耳；
电池测试仪，与所述锂离子电池电连接，用于控制所述锂离子电池充放电过程；以及
多个电流检测器，每个电流检测器与一个所述正极耳或一个所述负极耳感接，用于检测每个所述正极片或每个所述负极片的电流。
一种锂离子电池，包括：
多个正极片；
多个负极片，与所述多个正极片间隔设置；
多个正极耳，每个正极耳与一个所述正极片电连接；
多个负极耳，每个负极耳与一个所述负极片电连接；以及
多个隔膜，每个隔膜设置于所述正极片与所述负极片之间，且所述隔膜的长度大于所述负极耳的长度，所述隔膜的长度大于所述正极耳的长度。
本申请提供一种锂离子电池及其内部电流分布检测装置。所述锂离子电池内部电流分布检测装置包括锂离子电池、电池测试仪和多个电流检测器。所述锂离子电池包括多个正极片和多个负极片，每个正极片都连接一个正极耳，每个负极片都连接一个负极耳。所述电池测试仪控制所述锂离子电池充放电过程。每个所述电流检测器与一个极耳感接，用于检测每个正极片或每个负极片的电流。本申请提供的测量锂离子电池内部层间电流分布的装置中的所述多个电流检测器通过检测每个极耳所在线路上的电流进而检测电池的层间电流分布情况。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据公开的附图获得其他的附图。
图1为本申请一个实施例提供的一种锂离子电池内部电流分布检测装置图；
图2为本申请一个实施例提供的一种锂离子电池内部电流分布检测装置图；
图3为本申请一个实施例提供的一种电池测试仪的供电方式连接图；
图4为本申请一个实施例提供的一种锂离子电池结构图。
主要元件附图标号说明
锂离子电池内部电流分布检测装置100
供电装置10
正极端子11
负极端子12
接地端子13
电流检测器20
第一端子21
第二端子22
第三端子23
第四端子24
电流夹子30
电流引线31
锂离子电池40
正极片41
负极片42
极耳43
正极耳431
负极耳432
隔膜44
铝塑膜45
容纳空间451
电池测试仪50
具体实施方式
为使本申请的上述目的、特征和优点能够更加明显易懂，下面结合附图对本申请的具体实施方式做详细的说明。在下面的描述中阐述了很多具体细节以便于充分理解本申请。但是本申请能够以很多不同于在此描述的其它方式来实施，本领域技术人员可以在不违背本申请内涵的情况下做类似改进，因此本申请不受下面公开的具体实施的限制。
需要说明的是，当元件被称为“设置于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的和所有的组合。
请参见图1，本申请一个实施例提供一种锂离子电池内部电流分布检测装置100。所述锂离子电池内部电流分布检测装置100包括锂离子电池40、电池测试仪50以及多个电流检测器20。
所述锂离子电池40包括多个正极片41、多个负极片42和多个极耳43。所述多个极耳43包括多个正极耳431和多个负极耳432。每个正极片41连接一个正极耳431。每个 负极片42连接一个负极耳432。所述电池测试仪50与所述锂离子电池40电连接。所述电池测试仪50用于控制所述锂离子电池40充放电过程。例如，所述电池检测仪50可以用于控制所述锂离子电池40充放电过程中电流或电压的大小。所述多个电流检测器20中，每个所述电流检测器20与一个所述极耳43感接。可以理解，所述多个电流检测器20可以为光纤传感器或者霍尔电流传感器。所述多个电流检测器20的检测精度可以为1％。所述多个电流检测器20用于检测每个所述正极片41的电流或每个所述负极片42的电流。
所述正极片41可以通过以下方法制备。首先，将正极活性物质、正极溶剂、正极粘接剂以及正极导电剂放入搅拌机进行搅拌，从而制得正极浆料初成品。然后，将所述正极浆料初成品烘干、辊压制得所述正极片41。所述负极片42可以通过以下方法制备。首先，将负极活性物质、负极溶剂、负极粘接剂以及负极导电剂放入搅拌机进行搅拌，从而制得负极浆料初成品。然后，将所述负极浆料初成品烘干、辊压制得所述负极片42。所述多个极耳43的材质可以为铝片或镍片。每个所述正极片41与每个所述正极耳431之间可以通过焊接连接。每个所述负极片42与每个所述负极耳432之间可以通过焊接连接。
本实施例中，所述锂离子电池内部电流分布检测装置100包括所述锂离子电池40、所述电池测试仪50和所述多个电流检测器30。所述锂离子电池40包括所述多个正极片41和所述多个负极片42。每个所述正极片41都连接一个所述正极耳431，每个所述负极片42都连接一个所述负极耳432。所述电池测试仪50用于控制所述锂离子电池40充放电过程。每个所述电流检测器20与一个所述极耳43感接。每个所述电流检测器20可以用于检测每个所述正极片41的电流或每个所述负极片42的电流。本申请提供的测量锂离子电池内部层间电流分布的装置100中的所述多个电流检测器20通过检测每个极耳43所在线路上的电流进而检测电池的层间电流分布情况。
请参见图2，在一个实施例中，所述正极片41与所述负极片42间隔设置，所述锂离子电池40还包括多个隔膜44。
每个所述隔膜44设置于所述正极片41与所述负极片42之间。且所述隔膜44的长度大于所述负极片42的长度，所述隔膜44的长度大于所述正极片41的长度。所述隔膜44可以为高分子薄膜，具有微孔结构。锂离子可以通过所述微孔结构，但电子不能通过所述微孔结构。所述隔膜44的设置可以保证各个所述正极片41以及各个所述负极片42之间彼此绝缘。
在一个实施例中，所述锂离子电池40还包括铝塑膜45。
所述铝塑膜45具有一个容纳空间451。所述铝塑膜45将所述多个正极片41、所述多个负极片42以及所述多个隔膜44收纳于所述收纳空间451。其中，在所述隔膜44延伸的 方向，所述隔膜44的两端与所述铝塑膜45接触。即所述隔膜44的长度延长至所述铝塑膜45密封边处。
本实施例中，所述隔膜44的设置可以保证各个所述正极片41以及各个所述负极片42之间彼此绝缘。所述隔膜44的长度可以延长至所述铝塑膜45密封边处，可以有效防止各个所述极耳43在从所述铝塑膜45伸出之前相互连通。
在一个实施例中，所述锂离子电池内部电流分布检测装置100还包括多个电流夹子30。每个电流夹子30与一个所述极耳43电连接。一个所述电流夹子30连接一条电流引线31。一个所述电流夹子30与一个所述电流检测器20之间通过一条所述电流引线31感接。每条所述电流引线31的长度和直径相等。所述电流引线31的内阻占所述正极片41或负极片42的比例为0-1％。在一个实施例中，每一条所述电流引线31的直径可以为4mm，长度均为66cm。当所述电流引线31的材质为铜时，由于铜的电阻率为0.0175Ωmm 2/m，因此可以计算出每一条电流引线的电阻为0.92mΩ。所述锂离子电池40的内阻约100mΩ的量级，所述电流引线31的内阻占所述正极片41或负极片42的比例为0.92％。
本实施例中，所述电流引线31的长度和直径相同。所述电流引线31的长度可以尽量短，较短的所述电流引线31可以有效防止各个所述电流引线31之间的电阻差异影响所述锂离子电池40层间电流分布的准确性。
请参见图3，在一个实施例中，当所述检测单元20为霍尔电流传感器时，所述的锂离子电池内部电流分布检测装置100还包括供电装置10。
所述供电装置10采用双路供电方式，用于向所述霍尔传感器提供电能。所述供电装置10采用双路供电方式。所述供电装置10包括正极端子11、负极端子12和接地端子13。所述电流检测器20包括第一端子21、第二端子22、第三端子23和第四端子24。所述正极端子11与所述第一端子21电连接，所述负极端子12与所述第二端子22电连接，所述接地端子13与所述第三端子23电连接。所述第四端子24为信号输出端。所述第四端子24通过负载与所述接地端子13电连接，用于保证当检测电流为0时输出电压信号为0。所述供电装置10采用双路供电方式确保了供电的可靠性。
请参见图4，本申请一个实施例中提供一种锂离子电池40。所述锂离子电池40包括多个正极片41、多个负极片42、多个极耳43和多个隔膜44，所述多个极耳43包括正极耳431和负极耳432。
所述多个负极片42与所述多个正极片41间隔设置。每个所述正极耳431与一个所述正极片41电连接。每个所述负极耳432与一个所述负极片42电连接。每个所述隔膜44设置于所述正极片41与所述负极片42之间。且所述隔膜44的长度大于所述负极片42的 长度。所述隔膜44的长度大于所述正极片41的长度。在一个实施例中，所述隔膜44的长度大于所述负极片42的长度，所述负极片42的长度大于所述正极片41的长度。
所述正极片41可以通过以下方法制备。首先，将正极活性物质、正极溶剂、正极粘接剂以及正极导电剂放入搅拌机进行搅拌，从而制得正极浆料初成品。然后，将所述正极浆料初成品烘干、辊压制得所述正极片41。所述负极片42可以通过以下方法制备。首先，负极活性物质、负极溶剂、负极粘接剂以及负极导电剂放入搅拌机进行搅拌，从而制得负极浆料初成品。然后，将所述负极浆料初成品烘干、辊压制得所述负极片42。所述多个极耳43的材质可以为铝片或镍片。每个所述正极片41与每个所述正极耳431之间可以通过焊接连接。每个所述负极片42与每个所述负极耳432之间可以通过焊接连接。所述隔膜44可以为高分子薄膜，具有微孔结构。锂离子可以通过所述微孔结构，但电子不能通过所述微孔结构。所述隔膜44的设置可以保证各个所述正极片41以及各个所述负极片42之间彼此绝缘。
本实施例中，所述锂离子电池40在每个所述正极片41上电连接所述正极耳431，并在每个所述负极片42上电连接所述负极耳432。此种设计方案可以通过与所述正极耳431或者所述负极耳432串联电流检测装置或者其他物理量检测装置，进而实现检测所述锂离子电池40内部物理量分布的目的。通过所述隔膜44的设置可以保证各个所述正极片41以及各个所述负极片42之间彼此绝缘。
在一个实施例中，所述锂离子电池40还包括铝塑膜45。在所述多个正极片41、所述多个负极片42以及所述多个隔膜44上可以通过冲压成型工艺形成铝塑膜45。在所述隔膜44延伸的方向，所述隔膜44的两端与所述铝塑膜45接触。即所述隔膜44的长度可以延长至所述铝塑膜45密封边处。
本实施例中，所述隔膜44的设置可以保证各个所述正极片41以及各个所述负极片42之间彼此绝缘。所述隔膜44的可以长度延长至所述铝塑膜45密封边处，所述隔膜44的长度设置可以有效防止各个所述极耳43在从所述铝塑膜45伸出之前相互连通。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种锂离子电池内部电流分布检测装置(100)，其特征在于，包括：
    锂离子电池(40)，包括多个正极片(41)、多个负极片(42)、多个正极耳(431)和多个负极耳(432)，所述多个正极片(41)与所述多个负极片(42)间隔设置，每个正极片(41)连接一个正极耳(431)，每个负极片(42)连接一个负极耳(432)；
    电池测试仪(50)，与所述锂离子电池(40)电连接，用于控制所述锂离子电池(40)充放电过程；以及
    多个电流检测器(20)，每个电流检测器(20)与一个所述正极耳(431)或一个所述负极耳(432)感接，用于检测每个所述正极片(41)或每个所述负极片(42)的电流。
  2. 根据权利要求1所述的锂离子电池内部电流分布检测装置(100)，其特征在于，还包括：
    多个隔膜(44)，每个隔膜(44)设置于所述正极片(41)与所述负极片(42)之间，且所述隔膜(44)的长度大于所述负极片(42)的长度，所述隔膜(44)的长度大于所述正极片(41)的长度。
  3. 根据权利要求2所述的锂离子电池内部电流分布检测装置(100)，其特征在于，所述锂离子电池(40)还包括：
    铝塑膜(45)，具有一个容纳空间(451)，所述铝塑膜(45)将所述多个正极片(41)、所述多个负极片(42)以及所述多个隔膜(44)收纳于所述收纳空间(451)，其中，在所述隔膜(44)延伸的方向，所述隔膜(44)的两端与所述铝塑膜(45)接触。
  4. 根据权利要求1所述的锂离子电池内部电流分布检测装置(100)，其特征在于，还包括：
    多个电流夹子(30)，每个电流夹子(30)与一个所述正极耳(431)或一个所述负极耳(432)电连接，一个所述电流夹子(30)通过一条电流引线(31)与一个所述电流检测器(20)感接。
  5. 根据权利要求4所述的锂离子电池内部电流分布检测装置(100)，其特征在于，每条所述电流引线(31)的长度和直径相等。
  6. 根据权利要求5所述的锂离子电池内部电流分布检测装置(100)，其特征在于，所述电流引线(31)的内阻占所述正极片(41)内阻或所述负极片(42)内阻的比例为0％-1％。
  7. 根据权利要求1所述的锂离子电池内部电流分布检测装置(100)，其特征在于，所述多个电流检测器(20)为光纤电流传感器或者霍尔电流传感器。
  8. 根据权利要求7中任一项所述的锂离子电池内部电流分布检测装置(100)，其特征在于，当所述多个电流检测器(20)为霍尔电流传感器时，所述的锂离子电池内部电流分布检测装置(100)还包括：
    供电装置(10)，采用双路供电方式，用于向所述霍尔传感器提供电能。
  9. 根据权利要求8所述的锂离子电池内部电流分布检测装置(100)，其特征在于，所述供电装置(10)包括正极端子(11)、负极端子(12)和接地端子(13)；
    所述电流检测器(20)包括第一端子(21)、第二端子(22)和第三端子(23)；所述正极端子(11)与所述第一端子(21)电连接，所述负极端子(12)与所述第二端子(22)电连接，所述接地端子(13)与所述第三端子(23)电连接。
  10. 一种锂离子电池(40)，其特征在于，包括：
    多个正极片(41)；
    多个负极片(42)，与所述多个正极片(41)间隔设置；
    多个正极耳(431)，每个正极耳(431)与一个所述正极片(41)电连接；
    多个负极耳(432)，每个负极耳(432)与一个所述负极片(42)电连接；以及
    多个隔膜(44)，每个隔膜(44)设置于所述正极片(41)与所述负极片(42)之间，且所述隔膜(44)的长度大于所述负极耳(432)的长度，所述隔膜(44)的长度大于所述正极耳(431)的长度。
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