Multi-electrode soft package battery and power supply device

Abstract

The utility model discloses a multi-electrode soft package battery and a power supply device, the battery is provided with a first reference electrode, a second reference electrode and a third reference electrode, and a first end section of the first reference electrode is clamped between a top negative plate and an adjacent diaphragm. And the first end section of the second reference electrode is clamped between the bottom-layer positive plate and the adjacent diaphragm. The first end section of the third reference electrode is clamped between the middle-layer pole piece and the adjacent diaphragm; the number of the third reference electrodes is greater than 1, and the first ends of the third reference electrodes are clamped at different positions among the layers. The second end section of the first reference electrode, the second end section of the second reference electrode and the second end section of the third reference electrode all extend out of the flexible package of the multi-electrode soft package battery and are used for being externally connected with a testing device, multi-point detection of the soft package battery is achieved, the internal state of the battery is comprehensively known by arranging a plurality of reference electrodes at different positions, and the detection accuracy of the multi-electrode soft package battery is improved. And the accuracy of a battery test result is improved.

Description

Technical Field

[0001] The utility model relates to the field of energy storage batteries, in particular to a multi-electrode soft-pack battery and a power supply device. Background Art

[0002] Soft-pack lithium-ion batteries are widely used in portable electronic devices, electric vehicles, and energy storage systems due to their high energy density, good cycle performance, and flexible design.

[0003] However, during the use of soft-pack lithium-ion batteries, lithium plating can lead to capacity degradation and safety hazards. Existing technologies typically rely on a single test electrode to detect lithium plating, which significantly limits a comprehensive understanding of the battery's internal state and leads to inaccurate test results. Utility Model Content

[0004] The utility model provides a multi-electrode soft-pack battery and a power supply device to improve the accuracy of battery test results.

[0005] According to one aspect of the present invention, a multi-electrode soft-pack battery is provided, the multi-electrode soft-pack battery comprising:

[0006] a first reference electrode, wherein a first end section of the first reference electrode is sandwiched between the top negative electrode sheet and an adjacent separator;

[0007] a second reference electrode, wherein a first end section of the second reference electrode is sandwiched between the bottom positive electrode sheet and an adjacent separator;

[0008] a third reference electrode, wherein the first end section of the third reference electrode is sandwiched between the middle electrode and the adjacent diaphragm; the number of the third reference electrodes is greater than one, and the first end of each third reference electrode is sandwiched at a different position between the layers;

[0009] The second end segment of the first reference electrode, the second end segment of the second reference electrode, and the second end segment of the third reference electrode all protrude out of the soft package of the multi-electrode soft-pack battery for connection to an external testing device.

[0010] Optionally, the first reference electrode, the second reference electrode and the third reference electrode all comprise metal wires.

[0011] Optionally, an insulating layer is provided on the surface of the middle section of the metal wire, and the metal of the two end sections of the metal wire is exposed;

[0012] The first end section of the metal wire serves as the first end section of the corresponding reference electrode and is sandwiched between the corresponding layers; the second end section of the metal wire serves as the second end section of the corresponding reference electrode and is used for connecting to an external test device.

[0013] Optionally, the multi-electrode soft-pack battery further includes: connecting pieces corresponding one-to-one to the reference electrodes;

[0014] The connecting piece is made of conductive material and is arranged outside the soft package of the multi-electrode soft-pack battery. The second end section of the reference electrode is welded to the corresponding connecting piece, and the connecting piece is used for external testing equipment.

[0015] Optionally, the multi-electrode soft-pack battery further includes: a fixing panel;

[0016] The fixed panel is made of insulating material, and the connecting pieces are arranged on the surface of the fixed panel.

[0017] Optionally, the multi-electrode soft-pack battery further includes: a metal protective tape, and at least a portion of the middle section of each reference electrode is fixed on the metal protective tape.

[0018] Optionally, the metal protection strip is a nickel strip.

[0019] Optionally, the flexible packaging comprises a first flexible packaging layer and a second flexible packaging layer;

[0020] The inner surface of the first soft packaging layer is opposite to the inner surface of the second soft packaging layer, and the edge areas are correspondingly welded and fixed to form a cavity to accommodate the electrode, the diaphragm and the electrolyte.

[0021] Optionally, the metal protective tape is fixedly welded between a preset position on the inner edge region of the first flexible packaging layer and a corresponding position on the inner edge region of the second flexible packaging layer.

[0022] According to another aspect of the present invention, a power supply device is provided, comprising: a battery management system and any of the multi-electrode soft-pack batteries described in the previous aspect.

[0023] The multi-electrode soft-pack battery and power supply device provided by the present invention are provided with a first reference electrode, a second reference electrode and a third reference electrode. The first end section of the first reference electrode is sandwiched between the top negative electrode sheet and its adjacent diaphragm. The first end section of the second reference electrode is sandwiched between the bottom positive electrode sheet and its adjacent diaphragm. The first end section of the third reference electrode is sandwiched between the middle electrode sheet and its adjacent diaphragm; the number of third reference electrodes is greater than 1, and the first end of each third reference electrode is sandwiched at a different position between the layers. The second end section of the first reference electrode, the second end section of the second reference electrode and the second end section of the third reference electrode all protrude from the soft package of the multi-electrode soft-pack battery and are used for external testing devices, thereby realizing multi-point detection of the soft-pack battery. By setting multiple reference electrodes in different positions, a comprehensive understanding of the internal state of the battery is obtained, thereby improving the accuracy of the battery test results.

[0024] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic structural diagram of a multi-electrode soft-pack battery provided in an embodiment of the present utility model;

[0027] Figure 2 A schematic diagram of another multi-electrode soft-pack battery provided in an embodiment of the present invention;

[0028] Figure 3 A schematic structural diagram of a reference electrode provided in an embodiment of the present utility model;

[0029] Figure 4 A schematic structural diagram of a multi-electrode soft-pack battery provided in an embodiment of the present utility model;

[0030] Figure 5 A schematic structural diagram of a partial cross section of a multi-electrode soft-pack battery provided in an embodiment of the present utility model;

[0031] Figure 6 A schematic diagram of the composition of a power supply device provided in an embodiment of the present utility model;

[0032] Figure 7 A schematic diagram of the composition of a power supply device provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0033] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] In order to solve the problems in the background technology, this application proposes a multi-electrode soft-pack battery. Figure 1 A schematic diagram of the structure of a multi-electrode soft-pack battery provided in an embodiment of the present invention is provided for a clearer illustration. Figure 1 The soft packaging and electrolyte components of the multi-electrode soft pack battery are omitted, and only the stacked structure consisting of each electrode and diaphragm is retained. Figure 1 The multi-electrode soft-pack battery 100 includes a first reference electrode 101, a second reference electrode 102, and a third reference electrode 103. The first end section of the first reference electrode 101 is sandwiched between the top negative electrode sheet 104 and its adjacent separator. The first end section of the second reference electrode 102 is sandwiched between the bottom positive electrode sheet 105 and its adjacent separator. The first end section of the third reference electrode 103 is sandwiched between the middle electrode sheet 106 and its adjacent separator; the number of third reference electrodes 103 is greater than 1, and the first end of each third reference electrode 103 is sandwiched at a different position between the layers. The second end section of the first reference electrode 101, the second end section of the second reference electrode 102, and the second end section of the third reference electrode 103 all protrude from the soft package of the multi-electrode soft-pack battery 100 for external testing equipment.

[0036] Specifically, the electrodes of the multi-electrode pouch cell 100 are stacked in a structure where the positive and negative electrodes are alternately arranged, with a separator between adjacent electrodes. The top and bottom layers of the stack are the negative and positive electrodes, respectively, at the ends of the stack. The top negative electrode 104 and bottom positive electrode 105 extend from the pouch cell, extending through metal connectors. These electrodes serve as the total positive and negative electrodes of the multi-electrode pouch cell 100, powering electrical appliances.

[0037] The first reference electrode 101 refers to a reference electrode arranged at the top layer of the electrode stacking structure, and the preset length segment of its first end serves as the first end segment. The first end segment of the first reference electrode 101 is clamped between the top negative electrode 104 and the adjacent diaphragm. The preset length segment of the second end of the first reference electrode 101 serves as the second end segment. The second end segment of the first reference electrode 101 protrudes from the soft package and is connected to an external testing device. The second reference electrode 102 refers to a reference electrode arranged at the bottom layer of the electrode stacking structure, and is similar to the first reference electrode 101, and the preset length segment of its first end serves as the first end segment. The first end segment of the second reference electrode 102 is clamped between the bottom positive electrode 105 and the adjacent diaphragm. The preset length segment of the second end of the second reference electrode 102 serves as the second end segment. The second end segment of the second reference electrode 102 protrudes from the soft package and is connected to an external testing device. The third reference electrode 103 is a reference electrode located in the middle layer of the electrode stack. Similar to the first and second reference electrodes 101 and 102, a predetermined length segment of its first end serves as the first end segment. The first end segment of the third reference electrode 103 is clamped between the middle electrode 106 and the adjacent separator on one side. The predetermined length segment of the second end of the third reference electrode 103 serves as the second end segment. The second end segment of the third reference electrode 103 protrudes from the flexible packaging and is connected to an external testing device. The middle electrode 106 is the electrode located in the middle layer of the electrode stack and can be either a positive electrode or a negative electrode. The number of third reference electrodes 103 is not limited to one. The first end segments of multiple third reference electrodes 103 are clamped at different locations between their corresponding middle electrode and separator. The specific clamping location can be customized based on testing requirements. For example, two third reference electrodes 103 can be clamped at opposite edges of the sandwich or at opposite ends of the same edge. The three reference electrodes can be strip metal sheets or wires.

[0038] The multi-electrode soft-pack battery provided in this embodiment is provided with a first reference electrode, a second reference electrode and a third reference electrode. The first end section of the first reference electrode is sandwiched between the top negative electrode sheet and its adjacent diaphragm. The first end section of the second reference electrode is sandwiched between the bottom positive electrode sheet and its adjacent diaphragm. The first end section of the third reference electrode is sandwiched between the middle electrode sheet and its adjacent diaphragm; the number of third reference electrodes is greater than 1, and the first end of each third reference electrode is sandwiched at a different position between the layers. The second end section of the first reference electrode, the second end section of the second reference electrode and the second end section of the third reference electrode all protrude from the soft package of the multi-electrode soft-pack battery and are used for external testing equipment, thereby realizing multi-point detection of the soft-pack battery. By setting multiple reference electrodes in different positions, a comprehensive understanding of the internal state of the battery is obtained, thereby improving the accuracy of the battery test results.

[0039] Optionally, Figure 2A schematic diagram of another multi-electrode soft-pack battery provided in an embodiment of the present invention is shown. Figure 3 A schematic diagram of the structure of a reference electrode provided in an embodiment of the present invention is provided for a clearer illustration. Figure 2 The soft packaging of the multi-electrode soft pack battery is omitted. Based on the above embodiment, Figure 2 and Figure 3 , the first reference electrode 101, the second reference electrode 102 and the third reference electrode 103 all include metal wires. An insulating layer 301 is provided on the surface of the middle section of the metal wire, and the two end sections of the metal wire are exposed. Among them, the first end section of the metal wire serves as the first end section of the corresponding reference electrode, clamped between the corresponding layers; the second end section of the metal wire serves as the second end section of the corresponding reference electrode, and is used for an external test device. The multi-electrode soft-pack battery 100 also includes a connecting piece 201 corresponding to the reference electrode one by one. The connecting piece 201 is made of a conductive material and is arranged outside the soft package of the multi-electrode soft-pack battery 100. The second end section of the reference electrode is welded to its corresponding connecting piece 201, and the connecting piece 201 is used for an external test device.

[0040] Specifically, the first reference electrode 101, the second reference electrode 102 and the third reference electrode 103 can all be set as metal wires. The material of the metal wires can be set according to the actual needs of the test. For example, the metal wires can be copper wires. Different reference electrodes can also use metals of different materials. At least part of the metal wire is covered with an insulating layer 301. The insulating layer 301 is a film layer made of insulating material and wrapped on the surface of the metal wire. It can prevent inaccurate test results caused by short circuits of the reference electrodes. The metal wire of each reference electrode is divided into three sections: a first end section, a middle section, and a second end section. The two end sections refer to the two ends of the metal wire and the metal wire sections adjacent to the two ends, and the middle section is the middle section arranged between the two end sections. The first end section is exposed without the insulating layer 301 and is used to be sandwiched between the corresponding layers of the stacked structure. The second end section is exposed without the insulating layer 301 and is used for external testing equipment. An insulating layer 301 is provided on the surface of the middle section to prevent electrical conduction with other components in the soft-pack battery, which may cause inaccurate test results. Exemplarily, the insulating layer 301 may include an insulating paint layer.

[0041] The connecting piece 201 is a conductor piece provided on one end of the reference electrode external test device for directly connecting to the test device. For example, the connecting piece 201 may include a metal piece with good conductivity and not easily oxidized, such as an aluminum sheet or a copper sheet, or a plated metal sheet. The reference electrode and the connecting piece 201 correspond one to one. The provision of the connecting piece 201 increases the connection area of ​​the reference electrode, so that the test device can be welded or clamped to the connecting piece 201 by wire, which greatly reduces the difficulty of external connection of the reference electrode and improves the connection reliability of the reference electrode. For example, the multi-electrode soft-pack battery 100 also includes a fixed panel 202; the fixed panel 202 can be an insulating material such as a hard resin, and each connecting piece 201 is fixedly or detachably arranged on the surface of the fixed panel 202 and a certain distance is set between each connecting piece 201. On the one hand, the hard fixed panel 202 supports the second end section of the reference electrode and the connecting piece 201 to prevent the connecting piece 201 and the metal wire from being bent and damaged. On the other hand, the fixed panel 202 fixes the position of the connecting piece 201, and the corresponding positions on the surface of the fixed panel 202 can be provided with numbered labels of each reference electrode to facilitate the test personnel to find and connect each reference electrode and improve the test efficiency. In addition, the setting of the fixed panel 202 can also reduce the difficulty of setting the reference electrode during the battery manufacturing process and increase the success rate of reference electrode production.

[0042] Figure 4 This is a schematic structural diagram of a multi-electrode soft-pack battery provided by an embodiment of the present utility model. Figure 5 This is a schematic structural diagram of a partial cross-section of a multi-electrode soft-pack battery provided by an embodiment of the present utility model. Figure 5 for Figure 4 The shown schematic diagram is a partial view of the multi-electrode soft-pack battery cut by plane O. Figure 4 The invisible structures on the surface (such as the reference electrode portion, the metal protection band 401 and the cavity 402) are shown with dashed lines. Figure 4 and Figure 5 The multi-electrode soft-pack battery 100 further includes a metal protective tape 401, and at least a portion of the middle section of each reference electrode is fixed to the metal protective tape 401. In addition, the soft package 400 of the multi-electrode soft-pack battery 100 may include a first soft-pack layer 403 and a second soft-pack layer 404. The inner surface of the first soft-pack layer 403 is opposite to the inner surface of the second soft-pack layer 404, and the edge areas 405 are correspondingly welded and fixed to form a cavity 402 to accommodate the electrode, diaphragm and electrolyte. The metal protective tape 401 is fixedly welded between a preset position on the inner edge area 405 of the first soft-pack layer 403 and a corresponding position on the inner edge area 405 of the second soft-pack layer 404.

[0043] Specifically, the metal protective belt 401 is a protective device for the middle section of the reference electrode and has a certain rigidity. Exemplarily, the metal protective belt 401 may include a nickel belt. At least part of the middle section of the reference electrode is fixed on the surface of a metal protective belt 401 or clamped and fixed between two overlapping metal protective belts 401 to prevent the bending damage of the part. Exemplarily, on the one hand, when the multi-electrode soft-pack battery 100 is provided with a fixed panel 202, the connecting piece 201 can be detachably fixed to the fixed panel 202, and one side edge of the metal protective belt 401 can be fixedly connected to the edge of the fixed panel 202, so that the surface of the metal protective belt 401 for fixing the middle section of the reference electrode and the side of the fixed panel 202 for fixing the connecting piece 201 are in the same plane, thereby preventing the reference electrode from being damaged due to bending at the connection. On the other hand, Figure 6 This is a schematic diagram of another multi-electrode soft pack battery provided by the present invention. Figure 6 In the absence of a fixed panel in multi-electrode soft-pack battery 100, the edge of connecting sheet 201 connected to the reference electrode can be in contact with the outer edge of metal protective tape 401, sandwiched between the two soft-pack layers. Soft sealing is used for welding between connecting sheet 201 and the soft-pack layer, and soft sealing is also used between metal protective tape 401 and the soft-pack layer. Ultrasonic welding is used between the reference electrode and connecting sheet 201.

[0044] Continue to refer to Figure 4 and Figure 5 The first soft packaging layer 403 and the second soft packaging layer 404 have the same shape and size and are arranged overlappingly. The inner surfaces of the two soft packaging layers are opposite and the edges are welded together, thereby forming a cavity 402 between the two soft packaging layers 400 that can accommodate the electrode and electrolyte. Along the extension direction of the reference electrode thereon, the width of the metal protective band 401 can be equal to the width of the inner edge area 405 of the soft packaging 400, so that the metal protective band 401 can be clamped and welded between the first soft packaging layer 403 and the second soft packaging layer 404 to play a fixing role. This also fixes the middle section of the reference electrode fixed on the metal protective band 401, further reducing the possibility of the middle section of the reference electrode being broken and improving the reliability of the reference electrode.

[0045] The utility model also provides a power supply device. Figure 7 A schematic diagram of a power supply device according to an embodiment of the present invention is provided. Figure 7 The power supply device 600 includes a battery management system BMS and a multi-electrode soft-pack battery 100.

[0046] The multi-electrode soft-pack battery and power supply device provided by the present invention are provided with a first reference electrode, a second reference electrode and a third reference electrode. The first end section of the first reference electrode is sandwiched between the top negative electrode sheet and its adjacent diaphragm. The first end section of the second reference electrode is sandwiched between the bottom positive electrode sheet and its adjacent diaphragm. The first end section of the third reference electrode is sandwiched between the middle electrode sheet and its adjacent diaphragm; the number of third reference electrodes is greater than 1, and the first end of each third reference electrode is sandwiched at a different position between the layers. The second end section of the first reference electrode, the second end section of the second reference electrode and the second end section of the third reference electrode all protrude from the soft package of the multi-electrode soft-pack battery and are used for external testing devices, thereby realizing multi-point detection of the soft-pack battery. By setting multiple reference electrodes in different positions, a comprehensive understanding of the internal state of the battery is obtained, thereby improving the accuracy of the battery test results.

[0047] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A multi-electrode soft pack battery, characterized in that: include: a first reference electrode, wherein a first end section of the first reference electrode is sandwiched between the top negative electrode sheet and an adjacent separator; a second reference electrode, wherein a first end section of the second reference electrode is sandwiched between the bottom positive electrode sheet and an adjacent separator; a third reference electrode, wherein the first end section of the third reference electrode is sandwiched between the middle electrode and the adjacent diaphragm; the number of the third reference electrodes is greater than one, and the first end of each third reference electrode is sandwiched at a different position between the layers; The second end segment of the first reference electrode, the second end segment of the second reference electrode, and the second end segment of the third reference electrode all protrude out of the soft package of the multi-electrode soft-pack battery for connection to an external testing device.

2. The multi-electrode soft pack battery according to claim 1, characterized in that: The first reference electrode, the second reference electrode, and the third reference electrode each include a metal wire.

3. The multi-electrode soft pack battery according to claim 2, characterized in that: An insulating layer is provided on the surface of the middle section of the metal wire, and the metal at the two end sections of the metal wire is exposed; The first end section of the metal wire serves as the first end section of the corresponding reference electrode and is sandwiched between the corresponding layers; the second end section of the metal wire serves as the second end section of the corresponding reference electrode and is used for connecting to an external test device.

4. The multi-electrode soft-pack battery according to any one of claims 1 to 3, characterized in that: Also includes: Connecting pieces corresponding one to one with the reference electrodes; The connecting piece is made of conductive material and is arranged outside the soft package of the multi-electrode soft-pack battery. The second end section of the reference electrode is welded to the corresponding connecting piece, and the connecting piece is used for external testing equipment.

5. The multi-electrode soft pack battery according to claim 4, characterized in that: Also includes: Fixed panels; The fixed panel is made of insulating material, and the connecting pieces are arranged on the surface of the fixed panel.

6. The multi-electrode soft pack battery according to claim 1, characterized in that: Also includes: A metal protective belt, on which at least a portion of the middle section of each reference electrode is fixed.

7. The multi-electrode soft pack battery according to claim 6, characterized in that: The metal protection belt is a nickel belt.

8. The multi-electrode soft pack battery according to claim 6, characterized in that: The flexible packaging comprises a first flexible packaging layer and a second flexible packaging layer; The inner surface of the first soft packaging layer is opposite to the inner surface of the second soft packaging layer, and the edge areas are correspondingly welded and fixed to form a cavity to accommodate the electrode, the diaphragm and the electrolyte.

9. The multi-electrode soft pack battery according to claim 8, characterized in that: The metal protective belt is fixedly welded between a preset position on the inner edge region of the first flexible packaging layer and a corresponding position on the inner edge region of the second flexible packaging layer.

10. A power supply device, characterized in that: include: A battery management system and a multi-electrode soft-pack battery according to any one of claims 1 to 9.

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