CN203414439U

CN203414439U - Reference electrode structure

Info

Publication number: CN203414439U
Application number: CN201320527797.1U
Authority: CN
Inventors: 黄世霖; 魏奕民
Original assignee: Ningde Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2013-08-28
Filing date: 2013-08-28
Publication date: 2014-01-29
Anticipated expiration: 2023-08-28

Abstract

The utility model provides a reference electrode structure which comprises a chip, multiple probes, multiple leads and multiple conductive pads, wherein the chip is provided with a frame part and a hollow part positioned in the frame part, and the hollow part serves as an ion channel between the positive pole piece and negative pole piece of an electrochemical device; each probe is a lithium reference electrode, and the probes are positioned in different positions in the hollow part of the chip; each lead is insulated and fixed on the frame part of the chip, and one end of each lead is electrically connected with the corresponding probe so that the probe is positioned in the hollow part of the chip in a cantilever manner; each conductive pad is insulated and fixed on the frame part of the chip and electrically connected with the other end of the corresponding lead so as to be electrically connected with an external detection device. By adopting the reference electrode structure provided by the utility model, the electrochemical polarization information in different positions in the electrochemical device can be provided in situ to contribute to the understanding of the polarization distribution rule in the electrochemical device, therefore, the electrochemical device is improved and optimized in design or process, and the comprehensive performance of the electrochemical device is further improved.

Description

Contrast electrode structure

Technical field

The utility model relates to a kind of electrochemical Characterization device, relates in particular to a kind of contrast electrode structure.

Background technology

Kinetics of electrode process in lithium ion battery is the key factor that determines the various critical nature performances such as energy, power and even cycle life of lithium ion battery, and the charge and discharge process dynamics of understanding lithium ion battery all has very important directive significance to aspects such as battery material modification, optimization battery design and improvement cell making process.

Contrast electrode is an important research method that characterizes kinetics of electrode process.In current flexible packing lithium ion battery research, often by insert in advance the method for filament (being often thin copper wire) between both positive and negative polarity in the battery production phase, prepare contrast electrode, realize the in-situ characterization that aligns negative electrode process.This flexible packing lithium ion battery three-electrode system technical maturity containing single contrast electrode, preparation simply, have obtained applying more widely.But the active area of this single contrast electrode is very little, only can provide the Electrochemistry Information of the some regional areas of inside battery.And along with the continuous increase of energy and the power demand of lithium ion battery, the pole piece area of battery also constantly increases, structure is also increasingly sophisticated, causes the activation polarization process of inside battery zones of different may have very large difference.Especially for powerful lithium ion battery, the unevenness of inside battery polarization distribution is a key reason that causes its power, cycle performance decay.And this single contrast electrode characterization technique, the activation polarization information of each diverse location of battery can not be provided in situ, to such an extent as to can not obtain the polarization distribution rule of inside battery, thereby bring difficulty to the combination property of optimizing battery structure, improving lithium ion battery.

Utility model content

In view of the problem existing in background technology, the purpose of this utility model is to provide a kind of contrast electrode structure, it can characterize the activation polarization process of each zones of different of electrochemical appliance inside simultaneously, to realize the original position analysis to its local polarisation difference.

To achieve these goals, the utility model provides a kind of contrast electrode structure, and it comprises: chip, and a hollow-out parts that there is a frame portion and be positioned at frame portion, hollow-out parts is as the anode pole piece of electrochemical appliance and the ion channel between cathode pole piece; A plurality of probes, each probe is lithium contrast electrode, is positioned at the diverse location of the hollow-out parts of chip; A plurality of leads, each lead wire insulation is fixed in the frame portion of chip, and one end of each lead-in wire is electrically connected to corresponding probe so that this probe cantilevered is positioned at the hollow-out parts of chip; And a plurality of conductive pads, the insulation of each conductive pad is fixed in the frame portion of chip and is electrically connected to the other end of corresponding lead-in wire, for being electrically connected on outside pick-up unit.

The beneficial effects of the utility model are as follows:

Employing has the contrast electrode structure of a plurality of probes, the activation polarization information of each diverse location in electrochemical appliance can be provided in situ, to contribute to understand the polarization distribution rule of electrochemical appliance inside, thereby in design or technique, electrochemical appliance is improved and optimizated, further improve the combination property of electrochemical appliance.

Accompanying drawing explanation

Fig. 1 is according to the schematic diagram of contrast electrode structure of the present utility model, and wherein for the sake of clarity, frame portion and heat-sealing bar illustrate with different interstitial wires;

Fig. 2 is for adopting according to the schematic diagram of an embodiment of the laminated flexible-packaging lithium ion battery of contrast electrode structure of the present utility model, and wherein for the sake of clarity, frame portion and heat-sealing bar illustrate with different interstitial wires;

Fig. 3 is the schematic diagram after the encapsulation of laminated flexible-packaging lithium ion battery of Fig. 2;

Fig. 4 is according to the schematic diagram of the contrast electrode structure for winding type soft package lithium ion battery of another embodiment of the utility model;

Fig. 5 is the schematic diagram of the alternate embodiment of Fig. 4.

Wherein, description of reference numerals is as follows:

1 chip 5 heat-sealing bars

11 frame portion 6 anode pole pieces

12 hollow-out parts 61 lugs

2 probe 7 cathode pole pieces

21 through hole 71 lugs

3 lead-in wire 8 barrier films

4 conductive pad 9 soft packaging bags

Embodiment

Describe in detail with reference to the accompanying drawings according to contrast electrode structure of the present utility model.

With reference to Fig. 1, Fig. 2, Fig. 4, Fig. 5, according to contrast electrode structure of the present utility model, comprise: chip 1, a hollow-out parts 12 that there is a frame portion 11 and be positioned at frame portion 11, hollow-out parts 12 is as the anode pole piece 6 of electrochemical appliance and the ion channel between cathode pole piece 7; A plurality of probes 2, each probe 2 is lithium contrast electrode, is positioned at the diverse location of the hollow-out parts 12 of chip 1; A plurality of leads 3, each 3 insulation that go between are fixed in the frame portion 11 of

chip

1, and 3 the one end of respectively going between is electrically connected to corresponding probe 2 so that these probe 2 cantilevereds are positioned at the hollow-out parts 12 of chip 1; And a plurality of

conductive pads

4,4 insulation of each conductive pad are fixed in the frame portion 11 of chip 1 and are electrically connected to the other end of corresponding lead-in wire 3, for being electrically connected on outside pick-up unit.(in other words frame portion 11 itself can be comprised of supporting layer and insulating cover, each lead-in wire 3 insulation are fixed on to the part that can be supported on supporting layer in the frame portion 11 of chip 1 and be supported on supporting layer to be covered by insulating cover, certainly respectively going between 3 also can be by adopting other insulating cover to be fixed on the frame portion 11 of chip 1), be mainly used in supporting whole chip 1 and form an integral body; Hollow-out parts 12 occupies most regions of chip 1, and these regions, as the anode pole piece 6 of electrochemical appliance and the ion channel between cathode pole piece 7, make described contrast electrode structure extremely minimum to the interference reduction of electrochemical appliance internal interface; Each conductive pad 4, as the interface of the signal of external detection device monitoring probe 2, independently exports detection signal; Utilize a plurality of independently probes 2 and hollow-out parts 12, contrast electrode structure of the present utility model can provide the activation polarization information of each diverse location in electrochemical appliance in situ, obtain the polarization distribution rule of electrochemical appliance inside, and then the deciding factor of analyzing influence electrochemical appliance performance.

In an embodiment of chip 1, chip 1 can be flexible PCB.Utilize the softness characteristics of flexible PCB, described contrast electrode structure can be applicable to the electrochemical appliance of various flexible packaging winding-structures.

According in contrast electrode structure of the present utility model, the working area of the area of hollow-out parts 12 and the anode pole piece of electrochemical appliance 6 and cathode pole piece 7 matches.The width of hollow-out parts 12 and length all can reach the Limiting Level of existing technique, thereby have reduced to greatest extent the impact of described contrast electrode structure on electrochemical appliance internal interface.

In an embodiment of probe 2, see figures.1.and.2, probe 2 is the ring-type solder joint with through hole 21.Preferably, ring-type solder joint at least surface be gold layer.Ring-type solder joint at least surface is that gold layer can strengthen its corrosion resistance and improve the reliability and stability of signal transmission.More preferably, a plurality of probe 2 is with arrayed.

In a lead-in wire embodiment of 3, going between 3 can be for being comprised of supporting layer, conductive layer and insulating cover successively, and preferably, conductive layer be gold layer, thereby improves the reliability and stability that signal transmits.

In an embodiment of conductive pad 4, conductive pad 4 at least surface is gold layer.Conductive pad 4 at least surface is that gold layer can strengthen its corrosion resistance and improve the reliability and stability of signal transmission.

According in contrast electrode structure of the present utility model, with reference to Fig. 1, Fig. 2, Fig. 3, described contrast electrode structure also can comprise: heat-sealing bar 5, is arranged between the hollow-out parts 12 and conductive pad 4 of chip 1, for the heat-seal after electrochemical appliance moulding.Preferably, heat-sealing bar 5 is positioned at one end contrary with the one end at

lug

61,71 places of anode pole piece 6 and cathode pole piece 7.Heat-sealing bar 5 forms by hot pressing pre-service, can realize easily contrast electrode structure and insert the heat-seal after electrochemical appliance.

According in contrast electrode structure of the present utility model, described electrochemical appliance can be laminated flexible-packaging lithium ion battery, winding type soft package lithium ion battery or capacitor.

For takeup type structure, while applying contrast electrode structure of the present utility model, similar with above-mentioned preferred embodiment, only need be according to the winding-structure of battery core and size, design the size of corresponding framework 11, it is mated with barrier film, the both positive and negative polarity size of coiling battery core, utilize its flexibility characteristics, in the coiling operation of battery core, insert the coiling that novel contrast electrode chip carries out battery core.Difference is the structural design of conductive pad 4, the drawing design and can be divided into bottom and draw with side and draw two kinds of patterns of conductive pad 4 in coiling battery core, draw bottom need to be by the width design of conductive pad 4 for more smaller than the cell width of electric core winding, be placed in the bottom (shown in Fig. 4) of framework 11 afterbodys, heat-sealing bar 5 pre-fixes equally in conductive pad 4 tops, sets position corresponding to battery core underseal; After coiling completes, with chi frame 11 tail ends of conductive pad 4 outermost layer in battery core just in time, when encapsulation, the sealing that heat-sealing bar 5 is stable with the corresponding formation of bottom package (with reference to Fig. 3) of battery core, conductive pad 4 stretches out the measurement for reference chip by the bottom of battery core.The pattern that draw side is relatively simple, the afterbody side (with reference to Fig. 5) directly conductive pad 4 being designed at framework 11, and heat-sealing bar 5 is set the position of corresponding battery core side seal, and after coiling completes, conductive pad 4 is drawn battery core for the measurement of reference chip by side.For laminated structure, as shown in Figure 1 to Figure 3, except battery core forming process difference, encapsulation process is same as described above, design the frame portion 11 of chip 1 and the size of hollow-out parts 12 of suitable described contrast electrode structure, the perform region of anode pole piece 6 and cathode pole piece 7 is right against respectively to the hollow-out parts 12 of contrast electrode structure; Between anode pole piece 6 and cathode pole piece 7 and contrast electrode structure, insert respectively one deck barrier film 8 to prevent probe 2 and anode pole piece 6 or cathode pole piece 7 short circuits of contrast electrode structure; With the flexible packing lithium ion battery packaging bag of appropriate size, the above-mentioned flexible packing lithium ion battery of folding is carried out to fluid injection encapsulation.The size of packaging bag must corresponding with the project organization of battery core (with reference to Fig. 3), first carry out the closedtop dress at positive pole ear 61 and negative lug 71 places, then alignd with the heat-sealing bar 5 that reference chip seals pressure in advance in packaging bag bottom, carrying out bottom envelope presses, an one side is being sealed, stay a side to carry out fluid injection, after fluid injection, carry out the heat-sealing of last side, complete encapsulation.The Multipoint synchronous that can adopt this contrast electrode structure to carry out both positive and negative polarity current potential after battery core has encapsulated is measured.

Claims

1. a contrast electrode structure, is characterized in that, comprising:

Chip (1), a hollow-out parts (12) that there is a frame portion (11) and be positioned at frame portion (11), hollow-out parts (12) is as the anode pole piece (6) of electrochemical appliance and the ion channel between cathode pole piece (7);

A plurality of probes (2), each probe (2) is lithium contrast electrode, is positioned at the diverse location of the hollow-out parts (12) of chip (1);

A plurality of leads (3), the frame portion (11) that chip (1) is fixed in each lead-in wire (3) insulation is upper, and one end of each lead-in wire (3) is electrically connected to corresponding probe (2) so that this probe (2) cantilevered is positioned at the hollow-out parts (12) of chip (1); And

A plurality of conductive pads (4), it is upper and be electrically connected to the other end of corresponding lead-in wire (3) that each conductive pad (4) insulation is fixed on the frame portion (11) of chip (1), for being electrically connected on outside pick-up unit.

2. contrast electrode structure according to claim 1, is characterized in that, chip (1) is flexible PCB.

3. contrast electrode structure according to claim 1, is characterized in that, the anode pole piece (6) of the area of hollow-out parts (12) and electrochemical appliance and the working area of cathode pole piece (7) match.

4. contrast electrode structure according to claim 1, is characterized in that, probe (2) is the ring-type solder joint of band through hole (21).

5. contrast electrode structure according to claim 4, is characterized in that, ring-type solder joint at least surface is gold layer.

6. contrast electrode structure according to claim 1, is characterized in that, a plurality of probes (2) are with arrayed.

7. contrast electrode structure according to claim 1, is characterized in that, conductive pad (4) at least surface is gold layer.

8. contrast electrode structure according to claim 1, is characterized in that, described contrast electrode structure also comprises:

Heat-sealing bar (5), is arranged between the hollow-out parts (12) and conductive pad (4) of chip (1), for the heat-seal after electrochemical appliance moulding.

9. contrast electrode structure according to claim 8, is characterized in that, heat-sealing bar (5) is positioned at one end contrary with the one end at lug (61, the 71) place of anode pole piece (6) and cathode pole piece (7).

10. contrast electrode structure according to claim 1, is characterized in that, described electrochemical appliance is laminated flexible-packaging lithium ion battery, winding type soft package lithium ion battery or capacitor.