First pole piece, winding battery cell and battery
By setting a vacant area on the main body of the first electrode sheet, the problem of damage to the reference electrode is solved by kneading the leveling operation, ensuring the performance of the reference electrode and achieving accurate control and measurement of the electrochemical reaction.
Patent Information
- Application Number
- CN202420371571.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-27
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-02-27
AI Technical Summary
In the ear-leveling process of the battery cell, the leveling operation can easily damage the reference electrode, affecting the control and measurement effect of the electrochemical reaction.
A first electrode sheet is designed, including a main body and a pole ear, and the main body is provided with a pole ear region and a vacant area. The vacant area is used to provide a reference electrode to reduce damage to the reference electrode by the kneading operation.
By providing a vacant area, the probability of direct contact and damage of the reference electrode with the pole ear is reduced, ensuring the performance of the reference electrode and achieving accurate control and measurement of electrochemical reactions.
Smart Images
Figure CN222785289U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a first pole piece, a wound battery core and a battery. Background Art
[0002] The three-electrode is widely used. It can be used in electrochemical analysis, electrochemical synthesis and other fields with good stability and high reliability. The related technology introduces a reference electrode into the battery cell to form a three-electrode battery, and uses the potential of the reference electrode to monitor the potential between the cathode and anode to achieve the control and measurement of the electrochemical reaction. However, in the flattening process of the battery cell's tab, the flattening operation is easy to damage the reference electrode, affecting the actual control and measurement of the electrochemical reaction. Therefore, it is necessary to study and improve the above problems. Utility Model Content
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a first pole piece, which can ensure the performance of the reference electrode.
[0004] The utility model also provides a wound battery core having the first pole piece.
[0005] The utility model also provides a battery with the wound battery core.
[0006] According to the first pole piece of the embodiment of the utility model, it includes a main body and a pole ear, the main body is provided with a pole ear area and a vacant area, the pole ear area and the vacant area are arranged in the length direction of the main body, the pole ear is connected to one side of the width direction of the main body, the position of the pole ear corresponds to the pole ear area, the pole ear extends to both ends of the pole ear area in the length direction of the main body, and the vacant area is used to set a reference electrode.
[0007] The first pole piece according to the embodiment of the utility model has at least the following beneficial effects: the setting of the vacant area can provide an accommodating space for the reference electrode. In the subsequent flattening process, since the vacant area is not provided with a pole ear, it can provide a downward pressing space for the reference electrode, thereby reducing the probability of direct contact between the reference electrode and the pole ear and damage by the flattening operation, thereby ensuring the performance of the reference electrode.
[0008] According to some embodiments of the present invention, the main body has a first end and a second end relative to each other in the length direction, the first end is used as the inner side of the winding, the second end is used as the outer side of the winding, the vacant area is located on the side close to the second end relative to the pole ear area, and the vacant area extends to the second end of the main body.
[0009] According to some embodiments of the present invention, the tab is connected to the main body as an integral structure.
[0010] According to an embodiment of the utility model, the wound battery cell includes a reference electrode, a second pole piece, a first diaphragm and the first pole piece described in any of the above embodiments, the first pole piece, the first diaphragm and the second pole piece are stacked in sequence along the thickness direction, the reference electrode is connected to the first diaphragm, and a portion of the reference electrode protrudes toward one side of the pole ear relative to the main body.
[0011] The wound battery cell according to the embodiment of the utility model has at least the following beneficial effects: by applying the first pole piece of the embodiment of the present application, a partially vacant position can be provided for setting a reference electrode, so as to reduce the influence of the flattening work on the reference electrode and ensure the performance of the reference electrode.
[0012] According to some embodiments of the present invention, the reference electrode includes a conductive member and an insulating layer, the insulating layer covers at least a portion of an outer surface of the conductive member, and the insulating layer and the electrode tab are arranged correspondingly in the thickness direction.
[0013] According to some embodiments of the present invention, the wound battery cell further includes a second separator, the second separator is stacked with the first separator, and the reference electrode is disposed between the first separator and the second separator.
[0014] According to an embodiment of the utility model, the wound battery comprises a shell, a top cover and the wound battery cell described in any of the above embodiments, the shell is provided with a receiving groove, the top cover covers the receiving groove, the wound battery cell is received in the receiving groove, and the pole ear is located on the side facing the top cover.
[0015] The wound battery according to the embodiment of the utility model has at least the following beneficial effects: by applying the wound battery cell of the embodiment of the present application, the performance of the reference electrode can be ensured, and the control and measurement of the electrochemical reaction of the battery can be accurately achieved.
[0016] According to some embodiments of the present invention, the top cover is provided with a lead-out hole, and a portion of the reference electrode is passed through the lead-out hole.
[0017] According to some embodiments of the present invention, the diameter of the lead-out hole is d, which satisfies: 4mm≤d≤6mm.
[0018] According to some embodiments of the present invention, the battery further comprises a sealing member, wherein the sealing member is arranged around the reference electrode, at least a portion of the sealing member is filled in the lead-out hole, and the sealing member seals the lead-out hole.
[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:
[0021] Figure 1 A schematic diagram of a wound battery cell according to an embodiment of the utility model;
[0022] Figure 2 A schematic diagram of a wound battery cell according to another embodiment of the present invention;
[0023] Figure 3 This is a schematic diagram of a wound battery cell in an embodiment of the utility model in a state where the winding is completed;
[0024] Figure 4 Schematic diagram of a battery according to an embodiment of the present utility model.
[0025] Reference numerals:
[0026] Battery 10, housing 11, top cover 12, lead-out hole 13;
[0027] A first pole piece 100, a main body 110, a pole ear region 111, a vacant region 112, a first end 113, a second end 114, and a pole ear 120;
[0028] A first diaphragm 200 ; a reference electrode 300 , a conductive member 310 , an insulating layer 320 ; a second diaphragm 400 ; and a sealing member 500 . DETAILED DESCRIPTION
[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0030] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0031] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0033] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0034] In order to solve the problem in the related art that the flattening operation can easily damage the reference electrode, the present application provides a vacant area on the first pole piece to keep the pole ear vacant, thereby providing a downward pressing space for the reference electrode to reduce the probability of damaging the reference electrode during the flattening operation.
[0035] The first pole piece, wound battery cell and battery of the embodiment of the present application are described below with reference to the drawings in the specification, wherein the drawings show the width direction in the up-down direction and the length direction in the left-right direction.
[0036] Reference Figure 1According to the first pole piece 100 of the embodiment of the utility model, it includes a main body 110 and a pole ear 120. The main body 110 is provided with a pole ear area 111 and a vacant area 112. The pole ear area 111 and the vacant area 112 are arranged in the length direction of the main body 110. The pole ear 120 is connected to one side of the width direction of the main body 110. The position of the pole ear 120 corresponds to the pole ear area 111. The pole ear 120 extends to both ends of the pole ear area 111 in the length direction of the main body 110. The vacant area 112 is used to set the reference electrode 300. The setting of the vacant area 112 can provide an accommodating space for the reference electrode 300. In the subsequent flattening process, since the vacant area 112 is not provided with the pole ear 120, the size of the vacant area 112 in the width direction of the main body 110 is smaller than the sum of the size of the pole ear area 111 in the width direction of the main body 110 and the size of the pole ear in the width direction of the main body 110. This can provide a downward pressing space for the reference electrode 300, reduce the probability of direct contact between the reference electrode 300 and the pole ear 120 and damage by the flattening operation, and ensure the performance of the reference electrode 300.
[0037] Specifically, the tab 120 extends continuously along the length direction of the main body 110, and the vacant area 112 can be disposed between two spaced tab areas 111, so that the reference electrode 300 is disposed at a position close to the middle of the length direction of the first pole piece 100. Figures 1 to 3 In other embodiments, the main body 110 has a first end 113 and a second end 114 relative to each other in the length direction, the first end 113 is used as the inner side of the winding, and the second end 114 is used as the outer side of the winding, the vacant area 112 is located on the side close to the second end 114 relative to the pole ear area 111, and the vacant area 112 extends to the second end 114 of the main body 110, so that after the first pole piece 100 is wound to form a wound battery cell, the reference electrode 300 is located on the outer side of the winding of the wound battery cell. Since the flattening operation is to twist the pole ear 120 toward the inner side of the winding, when the reference electrode 300 is located on the outer side of the winding, the probability of the pole ear 120 contacting the reference electrode 300 after flattening can be further reduced, and the probability of damaging the reference electrode 300 by the flattening operation can be further reduced.
[0038] Reference Figure 1 In some embodiments, the pole ear 120 is connected to the main body 110 as an integrated structure, that is, the pole ear 120 is a part reserved for the main body 110. After the winding is completed, a protruding full pole ear is formed on one side of the wound battery cell, and the portion of the pole ear 120 reserved for the main body 110 is removed from the corresponding portion of the vacant area 112 to provide a downward pressing space for the reference electrode 300.
[0039] Reference Figures 1 to 3According to the embodiment of the utility model, the wound cell includes a reference electrode 300, a second pole piece (not shown in the figure), a first diaphragm 200 and the first pole piece 100 of any of the above embodiments. The first pole piece 100, the first diaphragm 200 and the second pole piece are stacked in sequence along the thickness direction. The reference electrode 300 is connected to the first diaphragm 200, and a part of the reference electrode 300 protrudes toward one side of the pole ear 120 relative to the main body 110. By applying the first pole piece 100 of the embodiment of the present application, an empty space can be provided to set the reference electrode 300, so as to reduce the influence of the flattening work on the reference electrode 300 and ensure the performance of the reference electrode 300.
[0040] Specifically, the first pole piece 100 can be selected as a negative pole piece, and the second pole piece can be selected as a positive pole piece, and the first pole piece 100 is located on the outside of the wound battery cell relative to the second pole piece. In the embodiment where the reference electrode 300 is arranged on the outside of the winding, since the outermost pole piece of the wound battery cell is the first pole piece 100, the pole ear 120 moves away from the reference electrode 300 when it is flattened inward, which effectively reduces the probability of the pole ear 120 contacting the reference electrode 300, and provides space for the reference electrode 300, which is convenient for the subsequent extraction of the reference electrode 300. On the basis of blocking the first pole piece 100 and the second pole piece, the first diaphragm 200 can also insulate and protect the reference electrode 300, reduce the probability of the reference electrode 300 conducting electricity with the first pole piece 100 or the second pole piece, and reduce the risk of short circuit.
[0041] Reference Figure 1 In some embodiments, the reference electrode 300 includes a conductive member 310 and an insulating layer 320. The insulating layer 320 covers at least a portion of the outer surface of the conductive member 310. The insulating layer 320 and the tab 120 are arranged correspondingly in the thickness direction. The insulating layer 320 can effectively protect the conductive member 310 and reduce the risk of short circuit by isolating the conductive member 310 from the tab 120. When scratches occur during the flattening operation, the insulating layer 320 is in contact with the conductive member 310, and no scratches are caused to the conductive member 310, thereby reducing the probability of damage to the conductive member 310.
[0042] Specifically, the conductive member 310 is a reference metal wire, and the insulating layer 320 can be selected as an insulating member such as insulating tape, insulating tape, insulating glue, etc. The reference electrode 300 can be fixed to the first diaphragm 200 by adhesive tape or glue, and the conductive member 310 is electrically connected to the first diaphragm 200.
[0043] Reference Figure 2In some embodiments, the wound cell further includes a second separator 400, which is stacked with the first separator 200, and the reference electrode 300 is disposed between the first separator 200 and the second separator 400. The second separator 400 can further improve the insulation protection of the reference electrode 300. The first separator 200 and the second separator 400 cover the portion where the reference electrode 300 overlaps with the first pole piece 100 or the second pole piece, and particularly need to cover the portion where the conductive member 310 is exposed from the first pole piece 100 and the second pole piece to ensure the insulation effect.
[0044] Reference Figure 2 Furthermore, the second diaphragm 400 is connected to the first diaphragm 200 on both sides of the length direction of the main body 110, so that the second diaphragm 400 and the first diaphragm 200 are easily fixed relative to each other. The second diaphragm 400 can be fixed by bonding to the first diaphragm 200 with tape or glue, and the second diaphragm 400 can be quickly fixed on both sides of the length direction of the main body 110 by bonding, and it is not easy to move or fold when winding.
[0045] Reference Figure 3 and Figure 4 According to the embodiment of the utility model, the wound battery 10 comprises a housing 11, a top cover 12 and a wound battery cell of any of the above embodiments, the housing 11 is provided with a receiving groove (not shown in the figure), the top cover 12 covers the receiving groove, the wound battery cell is received in the receiving groove, and the tab 120 is located on the side facing the top cover 12. By applying the wound battery cell of the embodiment of the present application, the performance of the reference electrode 300 can be ensured, and the control and measurement of the electrochemical reaction of the battery 10 can be accurately realized.
[0046] The reference electrode 300 needs to be led out. In some embodiments, a lead-out hole 13 is provided on the side wall of the housing 11 for leading out. Figure 4 In some embodiments, the top cover 12 is provided with a lead-out hole 13, a part of the reference electrode 300 is passed through the lead-out hole 13, and the reference electrode 300 is led out from the top side of the battery 10, which can reduce the probability of the reference electrode 300 contacting the swelling tape outside the battery cell, and reduce the probability of the reference electrode 300 being damaged due to the swelling tape. And the reference electrode 300 extends along the width direction of the main body 110, that is, extends in the up and down direction after winding, which is convenient for leading out the reference electrode 300.
[0047] Among them, the aperture of the lead-out hole 13 is d, which satisfies 4mm≤d≤6mm. When d is in the range of 4mm to 6mm, there can be enough space to facilitate the lead-out of the reference electrode 300, reduce the difficulty of leading out the reference electrode 300 after the top cover 12 is connected to the shell 11, and avoid the safety risks caused by the excessively large lead-out hole 13. Specifically, d can be selected as 4mm, 4.5mm, 5mm, 5.5mm, 6mm or any value between 4mm and 6mm. It should be noted that the present application does not limit the specific range of d, and the selection of d less than 4mm and d greater than 6 can also be implemented in the present application.
[0048] Reference Figure 4 In some embodiments, the battery 10 further includes a seal 500, which is arranged around the reference electrode 300, and at least a portion of the seal 500 is filled in the lead-out hole 13. The seal 500 seals the lead-out hole 13. After the reference electrode 300 is passed through the lead-out hole 13 for lead-out, the lead-out hole 13 is sealed by the seal 500, which can improve the safety of the battery 10 and reduce the probability of safety risks such as leakage of the battery 10.
[0049] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.
Claims
1. A first pole piece, characterized in that: It includes a main body and a pole lug, wherein the main body is provided with a pole lug area and a vacant area, wherein the pole lug area and the vacant area are arranged in the length direction of the main body, the pole lug is connected to one side of the width direction of the main body, the position of the pole lug corresponds to the pole lug area, the pole lug extends to both ends of the pole lug area in the length direction of the main body, and the vacant area is used to set a reference electrode.
2. The first pole piece according to claim 1, characterized in that: The main body has a first end and a second end opposite to each other in the length direction, the first end is used as the inner side of the winding, and the second end is used as the outer side of the winding, the vacant area is located on the side close to the second end relative to the tab area, and the vacant area extends to the second end of the main body.
3. The first pole piece according to claim 1 or 2, characterized in that: The pole ear is connected to the main body to form an integral structure.
4. A wound battery cell, characterized in that: It includes a reference electrode, a second pole piece, a first diaphragm and the first pole piece according to any one of claims 1 to 3, the first pole piece, the first diaphragm and the second pole piece are stacked in sequence along the thickness direction, the reference electrode is connected to the first diaphragm, and a part of the reference electrode protrudes toward one side of the pole ear relative to the main body.
5. The wound battery cell according to claim 4, characterized in that: The reference electrode comprises a conductive member and an insulating layer, wherein the insulating layer covers at least a portion of an outer surface of the conductive member, and the insulating layer and the electrode tab are arranged correspondingly in the thickness direction.
6. The wound battery cell according to claim 4 or 5, characterized in that: The device further includes a second diaphragm, wherein the second diaphragm is stacked with the first diaphragm, and the reference electrode is disposed between the first diaphragm and the second diaphragm.
7. A battery, characterized in that It comprises a shell, a top cover and the wound battery cell according to any one of claims 4 to 6, wherein the shell is provided with a receiving groove, the top cover seals the receiving groove, the wound battery cell is received in the receiving groove, and the pole ear is located on the side facing the top cover.
8. The battery according to claim 7, characterized in that The top cover is provided with a lead-out hole, and a part of the reference electrode is passed through the lead-out hole.
9. The battery according to claim 8, characterized in that The aperture of the lead-out hole is d, which satisfies: 4mm≤d≤6mm.
10. The battery according to claim 9, characterized in that The battery further includes a sealing member, which is disposed around the reference electrode, at least a portion of which is filled in the lead-out hole, and the sealing member seals the lead-out hole.