Three-electrode battery
By using segmented wire design and sealing plugs, the problem of wire insulation failure in the fabrication of three-electrode batteries was solved, ensuring battery qualification and simplifying the manufacturing process.
Patent Information
- Application Number
- CN202423303957.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In the current manufacturing process of three-electrode batteries, the insulation layer on the wires is prone to failure in areas where it has not been scraped off, causing the wires to come into direct contact with the electrode plates and resulting in a defective battery.
The design employs segmented conductors. The first conductor is exposed and covered by a second diaphragm, while the second conductor extends out of the outer shell and is sealed with a sealing plug to prevent the conductor from contacting the electrode. The bonding and sealing measures prevent insulation failure.
It effectively prevents the insulated parts of the wires from coming into contact with the electrodes, ensuring the three-electrode battery is qualified, simplifying the manufacturing process and avoiding damage to the electrodes.
Smart Images
Figure CN223858193U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a three electrode battery. BACKGROUND
[0002] At present, the three electrode battery is an important analysis means for researching the failure reason of lithium battery, wherein the three electrodes refer to the positive electrode (working electrode), the negative electrode (counter electrode) and the reference electrode, after the three electrode battery is made, the potential change of the positive electrode and the reference electrode and the negative electrode and the reference electrode is measured, the positive and negative electrode impedance and the redox reaction process can be analyzed separately, thereby the failure reason of the lithium battery is analyzed.
[0003] From the above, in the prior art, the common three electrode battery manufacturing method is: firstly, the battery is disassembled, then the reference electrode is buried in the core package, thereby the three electrode battery is made. The reference electrode includes a wire, the side of the wire along the extension direction is scraped off the insulating layer, thereby the conductive wire is exposed, the outer periphery of the exposed conductive wire is covered with a diaphragm, in the prior art, the conductive wire covered by the diaphragm is completely inserted into the core package, but since the part of the wire where the insulating layer is not scraped off is prone to insulating layer failure, thereby after the conductive wire covered by the diaphragm is completely inserted into the core package, the part of the wire where the insulating layer fails is prone to directly contact with the pole piece of the core package, thereby the three electrode battery made is unqualified. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a three electrode battery, to solve the problem that after the conductive wire covered by the diaphragm is completely inserted into the core package, the part of the wire where the insulating layer fails is prone to directly contact with the pole piece of the core package, thereby the three electrode battery made is unqualified.
[0005] To achieve this purpose, the utility model adopts the following technical scheme:
[0006] The three electrode battery comprises:
[0007] The shell is provided with an opening;
[0008] The core package is placed in the shell and is formed by stacking a plurality of pole pieces, and a first diaphragm is arranged between any two adjacent pole pieces;
[0009] The reference electrode comprises a lead wire, the lead wire is divided into a first section of lead wire and a second section of lead wire, the conductive wire of the first section of lead wire is exposed, the conductive wire of the second section of lead wire is coated with an insulating layer, the first section of lead wire is coated with a second diaphragm, the first section of lead wire is stacked between the pole piece and the first diaphragm, and part of the first section of lead wire is exposed from the core package, wherein one end of the first section of lead wire is arranged between the pole piece and the first diaphragm, the other end of the first section of lead wire extends out of the core package, and the end of the first section of lead wire extending out of the core package is connected with the second section of lead wire, and the second section of lead wire passes through the opening and extends out of the shell.
[0010] Preferably, the first section of lead wire is bonded to the second diaphragm.
[0011] Preferably, the second diaphragm is bonded to the core package.
[0012] Preferably, the second diaphragm is bonded to the pole piece and / or the first diaphragm adjacent to the reference electrode.
[0013] Preferably, the shell is sealingly arranged between the part of the shell located at the opening and the second section of lead wire.
[0014] Preferably, the three-electrode battery further comprises a sealing plug, the sealing plug is sleeved on the outer periphery of the second section of lead wire and plugs into the opening.
[0015] Preferably, the sealing plug is provided with a socket, and the sealing plug is sleeved on the outer periphery of the second section of lead wire through the socket.
[0016] Preferably, the socket penetrates the sealing plug along a first direction, the sealing plug can be inserted into the opening along the first direction, and the socket is formed on the side surface of the sealing plug to the inside of the sealing plug along a second direction perpendicular to the first direction.
[0017] Preferably, a sealant is filled between the sealing plug and the shell.
[0018] Preferably, the second section of lead wire is bonded to one side of the core package along the stacking direction of the plurality of pole pieces and / or the inner wall of the shell.
[0019] The utility model discloses beneficial effects:
[0020] The utility model discloses, the lead wire is divided into two sections, wherein, the first section lead wire is placed between the polar piece and the first diaphragm and is close to the edge position of the polar piece and the first diaphragm, thereby make the partial position of the first section lead wire protrude from the core package, because the first section lead wire is all covered with the second diaphragm, therefore, the part of the lead wire is covered with the second diaphragm and is close to the core package outside the core package, namely, the part of the lead wire is covered with the second diaphragm and is close to the polar piece outside the core package, thereby make even if the second section lead wire exists partial position and leads the electrically conductive wire to expose because the insulating layer is scratched and is ineffective, and the exposed electrically conductive wire also does not contact the polar piece, further prevent the three electrode battery that the prepared causes the lead wire and is ineffective and directly contacts the polar piece because the insulating layer and leads to unqualified. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 It is the structure schematic diagram of three electrode battery in the utility model embodiment;
[0022] Figure 2 It is the explosion drawing of three electrode battery in the utility model embodiment;
[0023] Figure 3 It is Figure 2 The partial close -up of A in the middle;
[0024] Figure 4 It is Figure 2 The partial close -up of B in the middle;
[0025] Figure 5 It is the structure schematic diagram of three electrode battery except part shell in the utility model embodiment;
[0026] Figure 6 It is the explosion drawing of polar piece, first diaphragm and reference electrode that are stacked together in the utility model embodiment;
[0027] Figure 7 It is the structure schematic diagram of lead wire and sealing plug in the utility model embodiment;
[0028] Figure 8 It is Figure 7 The partial close -up of C in the middle;
[0029] Figure 9 It is the structure schematic diagram of sealing plug in the utility model embodiment.
[0030] In the drawing:
[0031] 1, shell;11, opening;2, core package;21, polar piece;22, first diaphragm;23, positive electrode lug;24, negative electrode lug;3, reference electrode;31, lead wire;311, first section lead wire;312, second section lead wire;32, second diaphragm;4, sealing plug;41, socket. DETAILED DESCRIPTION
[0032] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are merely used to explain the utility model and not limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.
[0033] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0034] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0035] In the description of the embodiment, the terms "up", "down", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.
[0036] Based on the foregoing content, the lithium battery is generally composed of a shell and a core package, the core package is placed in the shell, and is formed by stacking a plurality of pole pieces, wherein one of any two adjacent pole pieces is a negative pole piece, the other of any two adjacent pole pieces is a positive pole piece, and a diaphragm is interposed between the negative pole piece and the negative pole piece. The three-electrode battery manufacturing method in the prior art is: first, disassemble the shell of the lithium battery, then dislodge the pole pieces and the diaphragm, and insert the reference electrode between the pole pieces and the diaphragm, then reassemble the shell, and make the reference electrode pass out of the shell, thereby manufacturing a three-electrode battery.
[0037] As described above, for the reference electrode, the lead wire of the reference electrode is scraped of the insulating layer on one side thereof along the extending direction thereof, and is covered by the diaphragm, and the part of the lead wire covered by the diaphragm is completely inserted between the pole piece and the diaphragm of the core package. Since the insulating layer on the lead wire is thin, the part of the lead wire which is not scraped of the insulating layer is inevitably prone to the situation that the insulating layer fails due to accidental scratching, thereby leading to the problem that, after the part of the lead wire covered by the diaphragm is completely inserted between the pole piece and the diaphragm, the position of the lead wire where the insulating layer fails directly contacts the pole piece. Specifically, for the lead wire, when the insulating layer fails at the position adjacent to the part covered by the diaphragm, after the part of the lead wire covered by the diaphragm is completely inserted between the pole piece and the diaphragm, the position of the lead wire where the insulating layer fails is prone to directly contact the pole piece, thereby leading to the unqualified three-electrode battery prepared.
[0038] To solve the above problem, please refer to Figures 1 to 9 The embodiment provides a three-electrode battery, which also comprises a shell 1, a core package 2 and a reference electrode 3. The shell 1 is provided with an opening 11. The core package 2 is arranged in the shell 1 and is formed by stacking a plurality of pole pieces 21. A first diaphragm 22 is arranged between any two adjacent pole pieces 21. The reference electrode 3 comprises a lead wire 31. The lead wire 31 is divided into a first lead wire 311 and a second lead wire 312. The conductive wire of the first lead wire 311 is exposed, that is, the insulating layer of the first lead wire 311 is polished and scraped off. The conductive wire of the second lead wire 312 is covered with an insulating layer. The outer periphery of the first lead wire 311 is covered with a second diaphragm 32. Exemplarily, in the embodiment, the conductive wire is a copper wire.
[0039] As described above, the first lead wire 311 is arranged between the pole piece 21 and the first diaphragm 22, and part of the first lead wire 311 is exposed from the core package 2. One end of the first lead wire 311 is arranged between the pole piece 21 and the first diaphragm 22, the other end of the first lead wire 311 extends out of the core package 2, the one end of the first lead wire 311 extending out of the core package 2 is connected with the second lead wire 312, and the second lead wire 312 extends out of the shell 1 through the opening 11.
[0040] Based on the above, in the present embodiment, the lead wire 31 is divided into two sections, wherein the first section of the lead wire 311 is arranged adjacent to the edge of the pole piece 21 and the first diaphragm 22 at the position between the pole piece 21 and the first diaphragm 22, so that part of the first section of the lead wire 311 protrudes from the core package 2. Since the first section of the lead wire 311 is entirely covered by the second diaphragm 32, the part of the lead wire 31 outside the core package 2 and adjacent to the core package 2 is covered by the second diaphragm 32, i.e. the part of the lead wire 31 outside the core package 2 and adjacent to the pole piece 21 is covered by the second diaphragm 32, so that even if part of the second section of the lead wire 312 has exposed conductive wires due to the failure of the insulating layer, the exposed conductive wires will not come into contact with the pole piece 21, thereby preventing the three-electrode battery produced from being unqualified due to the direct contact between the part of the lead wire 31 with failed insulating layer and the pole piece 21.
[0041] Specifically, the method for producing the three-electrode battery in the present embodiment is as follows: the insulating layer on the first section of the lead wire 311 in the whole lead wire 31 is polished and scraped off to expose the conductive wire, and then the second diaphragm 32 is wrapped around the outer periphery of the first section of the lead wire 311, thereby producing the reference electrode 3. Then, in the process of stacking, the first section of the lead wire 311 is stacked between the pole piece 21 and the first diaphragm 22, specifically, in the process of stacking the positive pole piece, the negative pole piece and the first diaphragm 22 by the stacking machine, one pole piece 21 is selected, after the stacking of the pole piece 21 is completed, the reference electrode 3 is stacked, specifically, the first section of the lead wire 311 of the reference electrode 3 is stacked at the edge position of the pole piece 21, then a piece of the first diaphragm 22 is stacked, so that the first section of the lead wire 311 of the reference electrode 3 is stacked between the pole piece 21 and the first diaphragm 22, then the remaining pole pieces 21 and / or the first diaphragms 22 are sequentially stacked, so that the reference electrode 3 is inserted into the core package 2 produced by the stacking machine, then the core package 2 is assembled into the shell 1, and the second section of the lead wire 312 of the reference electrode 3 is pulled out of the shell 1 through the opening 11, thereby producing the three-electrode battery.
[0042] It is worth noting that the outer side of the core package 2 is provided with the positive pole lug 23 and the negative pole lug 24. In the present embodiment, since the part of the lead wire 31 outside the core package 2 and adjacent to the core package 2 is covered by the second diaphragm 32, i.e. the part of the lead wire 31 outside the core package 2 and adjacent to the pole lug is covered by the second diaphragm 32, the present embodiment can also effectively prevent the exposed conductive wire on the second section of the lead wire 312 from coming into contact with the pole lug, thereby further preventing the three-electrode battery produced from being unqualified.
[0043] It is also worth mentioning that, since the reference electrode 3 is directly stacked in the lamination process in the present embodiment, compared with the prior art which disassembles the shell 1 of the lithium battery first, then pries apart the electrode sheet 21 and the separator, and inserts the reference electrode 3 between the electrode sheet 21 and the separator, the present embodiment can simplify the manufacturing method of the three-electrode battery and avoid damaging the electrode sheet 21.
[0044] Further, in the present embodiment, the first section of the lead wire 311 is bonded to the second separator 32, so as to prevent the lead wire 31 from moving relative to the second separator 32, thereby on the one hand avoiding the end of the lead wire 31 extending into the jelly-roll 2 from extending out of the second separator 32 and directly contacting the electrode sheet 21 due to the whole lead wire 31 moving to the inside of the jelly-roll 2, i.e., the present embodiment can avoid the end of the first section of the lead wire 311 extending out of the second separator 32 and directly contacting the electrode sheet 21 away from the end of the second section of the lead wire 312, on the other hand, the present embodiment can also avoid the first section of the lead wire 311 moving out of the second separator 32 due to the whole lead wire 31 moving to the outside of the jelly-roll 2, thereby avoiding the conductive wire of the first section of the lead wire 311 being exposed, and further avoiding the conductive wire of the first section of the lead wire 311 directly contacting the electrode sheet 21.
[0045] Still further, the second separator 32 is bonded to the jelly-roll 2 to avoid the whole reference electrode 3 moving to the inside of the jelly-roll 2, thereby avoiding the exposed conductive wire on the second section of the lead wire 312 moving towards the electrode sheet 21, and further preventing the exposed conductive wire on the second section of the lead wire 312 from contacting the electrode sheet 21, in addition, the present embodiment can also effectively prevent the second separator 32 from moving relative to the first separator 22 and the first section of the lead wire 311, thereby preventing the second separator 32 from being misaligned with the first section of the lead wire 311, and further preventing the conductive wire at the part of the first section of the lead wire 311 extending out of the jelly-roll 2 from being exposed, so as to further prevent the conductive wire on the lead wire 31 from contacting the electrode sheet 21 or the tab.
[0046] Specifically, in the present embodiment, the second separator 32 is bonded to the first separator 22 adjacent to the reference electrode 3, so as to prevent the second separator 32 from moving.
[0047] Exemplarily, in the present embodiment, the second separator 32 is bonded to the first separator 22 by the glue liquid or adhesive tape coated at the edge position of the first separator 22.
[0048] Of course, in other alternative embodiments, the second separator 32 can also be bonded to the electrode sheet 21 adjacent to the reference electrode 3, or the second separator 32 can also be bonded to both the electrode sheet 21 and the first separator 22 adjacent to the reference electrode 3.
[0049] In the present embodiment, the first segment of wire 311 is adhered to the second diaphragm 32 by adhesion after the insulating layer on the first segment of wire 311 in the whole wire 31 is polished and scraped off, and the second diaphragm 32 covers the first segment of wire 311. In the lamination process, the second diaphragm 32 is adhered to the pole piece 21 and / or the first diaphragm 22 adjacent to the reference electrode 3 by coating glue or adhesive tape on the edge position of the pole piece 21 and / or the first diaphragm 22.
[0050] In the present embodiment, the part of the shell 1 at the opening 11 is sealed between the second segment of wire 312, so as to prevent foreign matter from entering the inside of the battery, and further prevent the unqualified problem of the prepared three-electrode battery.
[0051] In the present embodiment, the three-electrode battery further comprises a sealing plug 4, which is sleeved on the outer periphery of the second segment of wire 312 and plugs into the opening 11. That is, the present embodiment is sealed by the sealing plug 4 sleeved on the outer periphery of the second segment of wire 312, so as to achieve sealing while preventing the sealing structure from scratching the part of the second segment of wire 312 adjacent to the shell 1, thereby preventing the insulating layer at the part from being scratched and invalid, so as to prevent the conductive wire from being exposed, and further prevent the conductive wire of the second segment of wire 312 from contacting the shell 1, thereby preventing the prepared three-electrode battery from being unqualified due to the contact between the conductive wire of the second segment of wire 312 and the shell 1.
[0052] Specifically, the sealing plug 4 is provided with a socket 41, and the sealing plug 4 is sleeved on the outer periphery of the second segment of wire 312 through the socket 41. During the process of assembling the core package 2 into the shell 1 and making the second segment of wire 312 of the reference electrode 3 pass through the opening 11 out of the shell 1, the second segment of wire 312 is first inserted into the socket 41 so that the sealing plug 4 is sleeved on the outer periphery of the second segment of wire 312. When the second segment of wire 312 is inserted into the socket 41, the end of the second segment of wire 312 away from the first segment of wire 311 does not protrude from the end of the sealing plug 4. Then, the sealing plug 4 is inserted into the opening 11 of the shell 1 from the inside of the shell 1 and makes the sealing plug 4 protrude out of the shell 1 as a whole. Then, the second segment of wire 312 is pulled out of the part of the sealing plug 4 protruding out of the shell 1. After the second segment of wire 312 is pulled out, the sealing plug 4 is inserted back into the opening 11.
[0053] Based on the above, the socket 41 penetrates the sealing plug 4 along a first direction, that is, the axial direction of the sealing plug 4. The sealing plug 4 can be inserted into the opening 11 along the first direction. Moreover, the socket 41 is opened on the side surface of the sealing plug 4 to the inside of the sealing plug 4 along a second direction. That is, one side of the socket 41 extends to the side surface of the sealing plug 4 along the second direction, so that the second segment of wire 312 can be placed in the socket 41 by opening the socket 41, to facilitate the insertion of the second segment of wire 312 into the socket 41.
[0054] It can be understood that the sealing plug 4 inserted into the opening 11 of the shell 1 is in a tight fit state with the shell 1, so as to be able to seal the opening 41.
[0055] However, inevitably, there will be a gap between the sealing plug 4 and the shell 1. In order to block the gap, in the embodiment, sealing glue is filled between the sealing plug 4 and the shell 1.
[0056] Specifically, in the embodiment, a small amount of sealing glue is applied between the sealing plug 4 and the shell 1 after the sealing plug 4 is reinserted into the opening 11.
[0057] In addition, it is worth noting that in the embodiment, the second segment of wire 312 is adhered to one side of the core package 2 along the stacking direction of the plurality of pole pieces 21, that is, the part of the second segment of wire 312 located in the shell 1 is adhered to one side of the core package 2 along the stacking direction of the plurality of pole pieces 21, so as to prevent the second segment of wire 312 from shaking, and further more effectively prevent the position where the insulating layer of the second segment of wire 312 fails from directly contacting the pole piece 21.
[0058] Of course, in other alternative embodiments, the second segment of wire 312 can also be adhered to the inner wall of the shell 1, and the embodiment does not specifically limit this.
[0059] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.
Claims
1. A three-electrode cell, characterized in that, The application relates to a three-electrode battery, which comprises: a shell (1) and a core package (2), wherein the shell (1) is provided with an opening (11); the core package (2) is arranged in the shell (1) and is formed by stacking a plurality of pole pieces (21), and a first diaphragm (22) is arranged between any two adjacent pole pieces (21); and a reference electrode (3) comprising a wire (31), wherein the wire (31) is divided into a first section of wire (311) and a second section of wire (312), the conductive wire of the first section of wire (311) is exposed, the conductive wire of the second section of wire (312) is coated with an insulating layer, the first section of wire (311) is coated with a second diaphragm (32), the first section of wire (311) is arranged between the pole piece (21) and the first diaphragm (22), and part of the first section of wire (311) is exposed from the core package (2), wherein one end of the first section of wire (311) is arranged between the pole piece (21) and the first diaphragm (22), the other end of the first section of wire (311) extends out of the core package (2), and the end of the first section of wire (311) extending out of the core package (2) is connected with the second section of wire (312), and the second section of wire (312) extends out of the shell (1) through the opening (11).
2. The three-electrode cell of claim 1, wherein, The first section of wire (311) is bonded to the second diaphragm (32).
3. The three-electrode cell of claim 1, wherein, The second diaphragm (32) is bonded to the core package (2).
4. The three-electrode cell of claim 3, wherein, The second diaphragm (32) is bonded to the pole piece (21) and / or the first diaphragm (22) adjacent to the reference electrode (3).
5. The three-electrode cell of claim 1, wherein, The part of the shell (1) located at the opening (11) is sealed between the second section of wire (312).
6. The three-electrode cell of claim 5, wherein, The three-electrode battery further comprises a sealing plug (4) sleeved on the outer periphery of the second section of wire (312) and plugged into the opening (11).
7. The three-electrode cell of claim 6, wherein, The sealing plug (4) is provided with a socket (41), and the sealing plug (4) is sleeved on the outer periphery of the second section of wire (312) through the socket (41).
8. The three-electrode cell of claim 7, wherein, The socket (41) penetrates the sealing plug (4) along a first direction, the sealing plug (4) can be inserted into the opening (11) along the first direction, and the socket (41) is arranged on the side surface of the sealing plug (4) and extends into the interior of the sealing plug (4) along a second direction perpendicular to the first direction.
9. The three-electrode cell of claim 6, wherein, The sealing plug (4) and the shell (1) are filled with sealing glue.
10. The three-electrode cell of claim 1, wherein, The second section of wire (312) is bonded to one side of the core package (2) along the stacking direction of the plurality of pole pieces (21) and / or the inner wall of the shell (1).