Battery pole piece structure, battery assembly and electric equipment

Abstract

The utility model relates to a battery pole piece structure, a battery assembly and electric equipment, the battery pole piece structure comprises a pole piece body and a collection piece, the pole piece body comprises an active material layer and a current collector layer, and a gap structure is formed on at least one of the active material layer and the current collector layer; and the acquisition part is arranged in the gap structure and is used for acquiring the internal performance parameters of the battery, so that the internal performance parameters of the battery can be acquired, the internal state of the battery can be timely and accurately monitored in a lossless manner in real time, and related parameters of the battery can be mastered more comprehensively.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery pole piece structure, a battery assembly and an electrical device. Background Art

[0002] In the related technology, batteries usually use external protection boards or external testing instruments to detect external parameters of the battery cells, such as surface temperature, voltage, resistance, etc. However, it is impossible to obtain relevant parameters inside the battery, such as electrolyte conductivity, gas pressure, and gas composition changes, in a timely and accurate manner. Therefore, how to more comprehensively grasp the relevant parameters of the battery and improve the safety of the battery has become the research goal of industry insiders. Utility Model Content

[0003] The purpose of the present disclosure is to provide a battery pole piece structure, a battery assembly and an electrical device, so as to collect the internal performance parameters of the battery and realize timely and accurate real-time non-destructive monitoring of the internal state of the battery.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the present disclosure provides a battery pole piece structure for a battery assembly, wherein the battery pole piece structure comprises: a pole piece body, wherein the pole piece body comprises an active material layer and a current collector layer, and a gap structure is formed on at least one of the active material layer and the current collector layer; and a collecting piece, which is arranged in the gap structure and is used to collect internal performance parameters of the battery.

[0005] Optionally, the void structure is configured as a groove cavity and / or a hole cavity.

[0006] Optionally, the collecting component includes a micro-nano sensor, and the micro-nano sensor is used to collect at least one of the internal resistance, temperature, conductivity, pressure, and gas composition of the battery.

[0007] Optionally, the void structure is provided on a side of the active material layer away from the current collector layer.

[0008] Optionally, the active material layer includes a first active material layer and a second active material layer coated on both sides of the current collector layer, and the gap structure is formed on at least one of the first side of the first active material layer away from the current collector layer and the second side of the second active material layer away from the current collector layer; or the active material layer includes a third active material layer coated on one side of the current collector layer, and the gap structure is formed on the third side of the third active material layer away from the current collector layer.

[0009] Optionally, the collecting piece is arranged in at least one of the groove cavities and / or at least one of the hole cavities.

[0010] Optionally, the thickness of the pole piece body is 50-100 μm.

[0011] A second aspect of the present disclosure provides a battery assembly, including a battery cell, wherein the battery cell includes a positive electrode sheet and a negative electrode sheet, and at least one of the positive electrode sheet and the negative electrode sheet is constructed as the battery electrode sheet structure as described above.

[0012] Optionally, the battery assembly further includes a battery management module, and the acquisition component is signal-connected to the battery management module.

[0013] A third aspect of the present disclosure provides an electrical device, comprising the battery assembly as described above.

[0014] Through the above technical solution, that is, the battery pole piece structure provided by the present disclosure, a gap structure is formed on at least one of the active material layer and the current collector layer of the pole piece body. In this way, when the above battery pole piece structure is applied to, for example, the positive pole piece and / or negative pole piece of the battery cell, the contact area between the pole piece body and the electrolyte can be increased by adding the gap structure, the wettability of the electrolyte inside the battery cell to the pole piece body and the ion transmission performance can be improved, which is conducive to improving the battery performance and optimizing the battery performance. In addition, by providing a collection piece in the gap structure, the internal performance parameters of the battery can also be collected through the collection piece, so as to realize timely and accurate real-time non-destructive monitoring of the internal state of the battery, so as to facilitate a more comprehensive grasp of the relevant parameters of the battery.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0017] Figure 1 is a schematic structural diagram of a battery electrode structure provided in a first embodiment of the present disclosure;

[0018] Figure 2 is a front view of a battery electrode structure provided in a first embodiment of the present disclosure;

[0019] Figure 3 yes Figure 2 Cross-sectional view at the AA position;

[0020] Figure 4 is a schematic structural diagram of a battery electrode structure provided in a second embodiment of the present disclosure;

[0021] Figure 5is a front view of a battery electrode structure provided in a second embodiment of the present disclosure;

[0022] Figure 6 yes Figure 5 Cross-section view at the mid-BB position;

[0023] Figure 7 It is a schematic structural diagram of a battery electrode structure provided in the third embodiment of the present disclosure, in which the collecting member is not shown.

[0024] Description of Reference Numerals

[0025] 1-pole body; 110-active material layer; 111-first active material layer; 1111-first side; 112-second active material layer; 1121-second side; 113-third active material layer; 1131-third side; 114-wiring hole; 120-current collector layer; 130-gap structure; 131-groove cavity; 132-hole cavity; 140-ear structure; 2-collection component; 210-micro-nano sensor. DETAILED DESCRIPTION

[0026] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0027] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.

[0028] In the present disclosure, unless otherwise stated, "inside" and "outside" refer to the inside and outside relative to the outline of the component or structure itself. In addition, it should be noted that the terms used, such as "first" and "second", are used to distinguish one element from another element and do not have order and importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.

[0029] According to a first aspect of the present disclosure, a battery electrode structure is provided, referring to Figures 1 to 7 As shown, the battery pole piece structure includes a pole piece body 1 and a collecting piece 2, the pole piece body 1 includes an active material layer 110 and a current collector layer 120, and a gap structure 130 is formed on at least one of the active material layer 110 and the current collector layer 120; the collecting piece 2 is arranged in the gap structure 130 to collect the internal performance parameters of the battery.

[0030] Through the above technical solution, that is, the battery pole piece structure provided by the present disclosure, a gap structure 130 is formed on at least one of the active material layer 110 and the current collector layer 120 of the pole piece body 1. In this way, when the above battery pole piece structure is applied to, for example, the positive pole piece and / or negative pole piece of a battery cell, the contact area between the pole piece body 1 and the electrolyte can be increased by adding the gap structure 130, and the wettability of the electrolyte inside the battery cell to the pole piece body 1 and the ion transmission performance can be improved, which is conducive to improving the battery performance and optimizing the battery performance. In addition, by providing a collection piece 2 in the gap structure 130, the internal performance parameters of the battery can also be collected through the collection piece 2, so as to realize timely and accurate real-time non-destructive monitoring of the internal state of the battery, so as to facilitate a more comprehensive grasp of the relevant parameters of the battery.

[0031] It should be noted that the forming and preparation process of the above-mentioned gap structure 130 can be processed and prepared by, for example, laser etching processing technology, wherein the laser etching processing technology can be prepared by applying the application principle of laser in battery electrode processing in the prior art, and the present disclosure will not be elaborated here. Of course, the forming and preparation process of the above-mentioned gap structure 130 is exemplary, and those skilled in the art can also process it by forming and preparation processes such as chemical etching process according to needs, the purpose of which is to be able to process the gap structure 130 on the pole piece body 1, and the present disclosure is not limited to this.

[0032] In addition, in some embodiments, the collection component 2 may include a micro-nano sensor 210. Since the overall structure of the micro-nano sensor 210 has a low space occupancy rate, it is convenient to realize the miniaturization design requirements of the electrode body 1. At the same time, the micro-nano sensor 210 can also be used to collect the internal performance parameters of the battery, so as to realize timely and accurate real-time non-destructive monitoring of the internal state of the battery, so as to facilitate a more comprehensive grasp of the relevant parameters of the battery.

[0033] Among them, the micro-nano sensor 210 is a small device that can convert the sensed information into electrical signal output. The structural feature size of the micro-nano sensor 210 is usually in the micron to nanometer level, the overall size is small and the space occupancy rate is low. In addition, since the micro-nano sensor 210 is prepared by, for example, nanomaterials and micro-nano processing technology, it has the advantages of fast response time and high-precision detection. The specific material and preparation process of the micro-nano sensor 210 can be adaptively designed and prepared by referring to the existing design and preparation process of the micro-nano sensor 210, and the present disclosure will not go into details here.

[0034] In addition, the micro-nano sensor 210 can be configured to collect at least one of the internal resistance, temperature, conductivity, pressure, and gas composition of the battery, but is not limited to the collection of the above performance parameters. Those skilled in the art can adaptively design the specific structure of the micro-nano sensor 210 according to application requirements to achieve the collection requirements of other performance parameters of the battery. Exemplarily, the above-mentioned micro-nano sensor 210 can be configured as any sensor structure such as a micro-nano gas sensor, a micro-nano temperature sensor, a micro-nano pressure sensor, a micro-nano conductivity sensor, or a micro-nano multifunctional sensor known in the art. The present disclosure does not make specific limitations on this, and its purpose is to be able to achieve the collection of performance parameters inside the battery.

[0035] It should be noted that when the micro-nano sensor 210 is constructed as a well-known micro-nano temperature sensor in the art, for example, the micro-nano temperature sensor can convert the temperature into a change in resistance value by utilizing the influence of temperature on resistance value, and output an electrical signal to monitor the internal temperature state of the battery, for example; in addition, when the micro-nano sensor 210 is constructed as a well-known micro-nano pressure sensor in the art, for example, the micro-nano pressure sensor can convert the pressure into a change in resistance of the elastic material by utilizing the deformation of the elastic material after being subjected to force, and output an electrical signal to monitor the internal pressure state of the battery, for example. Of course, the micro-nano sensor 210 disclosed in the present invention is not limited to the above-mentioned micro-nano temperature sensor and micro-nano pressure sensor. Those skilled in the art can adaptively design the specific structure of the micro-nano sensor 210 according to application requirements, and the specific working principles of different types of micro-nano sensors can refer to the working principles of existing micro-nano sensors, and the present disclosure will not go into details here.

[0036] In some embodiments, reference Figures 1 to 6 As shown, the void structure 130 can be arranged on the side of the active material layer 110 away from the current collector layer 120, which is convenient for installation and manufacturing. Moreover, since the thickness of the active material layer 110 is thicker than that of the current collector layer 120, by arranging the void structure 130 and the internal collecting member 2 on the active material layer 110, it is possible to avoid the problem of significantly increasing the thickness of the current collector layer 120 and causing a decrease in the energy density of the battery, which is beneficial to optimizing the design thickness of the current collector layer 120 while also optimizing the battery performance.

[0037] Of course, it should be noted that in some embodiments not shown in the figure, since the structural dimensions of the void structure 130 and the collecting piece 2 are relatively small, the arrangement requirements of the void structure 130 and the collecting piece 2 can be achieved even without increasing the thickness of the current collector layer 120. In this case, the above-mentioned void structure 130 can also be formed on the current collector layer 120, and the collecting piece 2 can be arranged in the void structure 130; or, in other embodiments not shown in the figure, the void structure 130 can also be formed on the outer peripheral surface of the active material layer 110 surrounding the side away from the current collector layer 120. The present disclosure does not specifically limit such deformation methods, and those skilled in the art can adaptively design according to actual application requirements.

[0038] In some embodiments, reference Figures 1 to 3 As shown, the active material layer 110 may include a first active material layer 111 and a second active material layer 112 coated on both sides of the current collector layer 120 to achieve double-sided coating of the battery electrode structure. In addition, a gap structure 130 is formed on at least one of a first side surface 1111 of the first active material layer 111 away from the current collector layer 120 and a second side surface 1121 of the second active material layer 112 away from the current collector layer 120. For example, as Figures 1 to 3 As shown, a gap structure 130 is formed on the first side 1111 of the first active material layer 111 and the second side 1121 of the second active material layer 112, and the gap structure 130 can be configured as, for example, a groove cavity 131, and a collection member 2 is arranged in the groove cavity 131, so that the internal performance parameters of the battery can be collected through the collection member, so as to realize timely and accurate real-time non-destructive monitoring of the internal state of the battery, so as to more comprehensively grasp the relevant parameters of the battery. The present disclosure is not limited to this.

[0039] in, Figures 1 to 3 As shown in the figure, the first side surface 1111 of the first active material layer 111 and the second side surface 1121 of the second active material layer 112 are concave downward to form the above-mentioned groove cavity 131. In addition, the present disclosure does not specifically limit the specific shape structure of the groove cavity 131, for example, it can be Figure 1 The rectangular groove cavity structure shown in the figure, or, for example, a semicircular groove cavity structure or an inverted triangle groove cavity structure not shown in the figure, etc., the present disclosure does not specifically limit such deformation mode, and those skilled in the art can adaptively design according to actual application requirements, the purpose of which is to accommodate the collection piece 2.

[0040] In addition, the above-mentioned collecting member 2 can be bonded to the groove cavity 131 by, for example, gluing, or by, for example, opening a card slot on the inner wall of the groove cavity 131 and snapping the collecting member 2 to the groove cavity 131 to achieve a fixed connection between the two, so as to ensure that the collecting member 2 can work stably. Those skilled in the art can select a bonding method or a snap connection method or other connection methods known in the art according to actual application requirements to achieve a fixed connection between the collecting member 2 and the gap structure 130. The present disclosure is not limited thereto.

[0041] In addition, the above-mentioned specific embodiment in which the gap structure 130 is configured as the groove cavity 131 is exemplary. In other embodiments, refer to Figure 7 As shown, the void structure 130 can also be constructed as, for example, a cavity 132. For example, the side of the active material layer 110 away from the current collector layer 120 can be concave downward to form the above-mentioned cavity 132, and a collection member 2 is provided in the cavity 132. In addition, the collection member 2 can be fixed by the above-mentioned bonding method or clamping method or other connection methods known in the art, which will not be described in detail in this disclosure. In addition, the opening size of the above-mentioned groove cavity 131 or cavity 132 and the groove depth or hole depth are not specifically limited in this disclosure, and those skilled in the art can design them adaptively according to actual application requirements.

[0042] Of course, the specific embodiment of the double-sided coating of the battery pole piece structure described above is exemplary. In other embodiments, refer to Figures 4 to 6 As shown, the battery electrode structure can also be prepared by, for example, single-sided coating. For example, the active material layer 110 can include a third active material layer 113 coated on one side of the current collector layer 120, and a gap structure 130 is formed on a third side 1131 of the third active material layer 113 away from the current collector layer 120. The present disclosure does not specifically limit this type of deformation, and those skilled in the art can adaptively design it according to actual application requirements.

[0043] In some embodiments, reference Figures 1 to 7 As shown, the above-mentioned collecting piece 2 is arranged in at least one groove cavity 131 and / or at least one hole cavity 132, that is, it can be understood that the number of the above-mentioned gap structure 130 can be at least one, and at least one collecting piece 2 is arranged in at least one gap structure 130. For example, Figures 1 to 6 It is shown that the number of the gap structures 130 can be, for example, three, and each gap structure 130 is provided with a collecting piece 2, and in order to ensure a higher collecting effect, a collecting piece 2 is arranged in the middle position of the slot cavity 131 of the gap structure 130 in the length direction. Of course, the present disclosure is not limited to this. For example, multiple collecting pieces 2 can be arranged in each gap structure 130 according to actual application requirements to ensure a higher collecting effect. The present disclosure does not make specific limitations on this.

[0044] In addition, when there are multiple gap structures 130, the multiple gap structures 130 can be arranged in a matrix, so as to more evenly increase the contact area between the electrode body 1 and the electrolyte, ensure the high wettability of the electrolyte inside the battery cell to the electrode body 1, and improve the battery performance.

[0045] The length direction can be referred to Figure 2 In addition, the specific coating process of the active material layer 110 on the current collector layer 120 can be achieved by using the existing battery pole piece coating process in the art, and this disclosure will not elaborate on this.

[0046] In some embodiments, the thickness of the pole piece body 1 can be 50-100 μm, and the overall volume is small, which is conducive to improving the energy density of the battery, and the overall thickness of the pole piece body 1 is thin, which can reduce the transmission distance of the internal material of the battery, which is conducive to improving the charge transfer rate and improving the battery performance. Of course, the thickness of the pole piece body 1 is exemplary, and those skilled in the art can adaptively design the thickness of the pole piece body 1 according to actual application requirements, and the present disclosure is not limited thereto.

[0047] According to a second aspect of the present disclosure, a battery assembly is provided, the battery assembly includes a battery cell, the battery cell includes a positive electrode sheet and a negative electrode sheet, at least one of the positive electrode sheet and the negative electrode sheet is constructed as the above-mentioned battery electrode sheet structure, so that the internal performance parameters of the battery cell can be collected, and the internal state of the battery cell can be timely and accurately monitored in real time without loss. In addition, the battery assembly also has all the beneficial effects of the above-mentioned battery electrode sheet structure, which will not be described in detail in the present disclosure.

[0048] Exemplarily, when the battery pole piece structure is a positive pole piece, the active material layer 110 of the pole piece body 1 may include a positive electrode material, a conductive agent, and a binder, wherein the positive electrode material may be, for example, lithium cobalt acid, lithium iron phosphate, and ternary materials, and the current collector layer 120 may include aluminum foil. In addition, when the battery pole piece structure is a negative pole piece, the active material layer 110 of the pole piece body 1 may include a negative electrode material, a conductive agent, a thickener, and a binder, wherein the negative electrode material may be, for example, graphite or silicon material, and the current collector layer 120 may include copper foil, but the present disclosure is not limited thereto, and those skilled in the art may design adaptively according to actual application requirements.

[0049] Optionally, in some embodiments, the battery assembly may further include a battery management module (not shown), and the acquisition component 2 is signal-connected to the battery management module so as to collect the internal performance parameters of the battery through the acquisition component 2 and transmit them to the battery management module for analysis, so as to more comprehensively grasp the relevant parameters of the battery, so as to be able to make effective corrective measures and optimize the battery performance.

[0050] The acquisition unit 2 and the battery management module may be connected by wireless or wired signals, for example, Figure 1 As shown, a wiring hole 114 may be formed on the active material layer 110, and a pole ear structure 140 is provided on the current collector layer 120. The pole ear structure 140 may be welded and connected to the current collector layer 120 or may be integrally formed. The present disclosure does not specifically limit this. The wiring harness (not shown) of the acquisition piece 2 passes through the wiring hole 114 and is electrically connected to the pole ear structure 140. In this way, when connected by wire, there is no need to occupy additional space outside the pole piece body 1, and the space utilization rate is higher. The pole ear structure 140 is used to realize the electrical connection between the acquisition piece 2 and the battery management module, such as the battery protection board or other test instruments, so as to realize the collection of the internal performance parameters of the battery through the acquisition piece 2, and transmit them to the battery management module for analysis, so as to facilitate a more comprehensive grasp of the relevant parameters of the battery. The present disclosure is not limited to this.

[0051] In addition, it should be noted that the battery management module can be implemented with a structure known in the art, and the present disclosure does not elaborate on this, and those skilled in the art can design it adaptively according to actual application requirements. In addition, the present disclosure does not specifically limit the specific arrangement number of the positive and negative electrodes of the battery cell, and those skilled in the art can design it adaptively according to actual application requirements.

[0052] According to the third aspect of the present disclosure, there is provided an electric device, which includes the above-mentioned battery assembly, so as to collect the internal performance parameters of the battery cells of the battery assembly, and realize timely and accurate real-time non-destructive monitoring of the internal state of the battery cells. In addition, the electric device also has all the beneficial effects of the above-mentioned battery assembly, which will not be described in detail in the present disclosure.

[0053] Among them, the electrical equipment may be, for example, a fuel vehicle, a gas vehicle, a new energy vehicle, a portable device, and an electric tool, but the present disclosure is not limited thereto.

[0054] In addition, it should be noted that the battery pole piece structure provided in the first aspect of the present disclosure can be applied to application scenarios such as lithium-ion batteries. Of course, it is not limited to this. For example, the above-mentioned battery pole piece structure can also be applied to application scenarios such as new secondary batteries such as sodium-ion batteries or magnesium-ion batteries.

[0055] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0056] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0057] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery pole piece structure, characterized in that: The battery pole piece structure comprises: A pole piece body, the pole piece body comprising an active material layer and a current collector layer, at least one of the active material layer and the current collector layer having a gap structure formed thereon; and The collecting member is arranged in the gap structure to collect the internal performance parameters of the battery.

2. The battery pole piece structure according to claim 1, characterized in that: The void structure is configured as grooves and / or pores.

3. The battery pole piece structure according to claim 1 or 2, characterized in that: The collecting component includes a micro-nano sensor, and the micro-nano sensor is used to collect at least one of the internal resistance, temperature, conductivity, pressure, and gas composition of the battery.

4. The battery pole piece structure according to claim 1 or 2, characterized in that: The void structure is disposed on a side of the active material layer away from the current collector layer.

5. The battery pole piece structure according to claim 4, characterized in that: The active material layer comprises a first active material layer and a second active material layer coated on both sides of the current collector layer, and the void structure is formed on at least one of a first side of the first active material layer away from the current collector layer and a second side of the second active material layer away from the current collector layer; or The active material layer includes a third active material layer coated on one side of the current collector layer, and the gap structure is formed on a third side surface of the third active material layer away from the current collector layer.

6. The battery pole piece structure according to claim 2, characterized in that: The collecting member is arranged in at least one of the groove cavities and / or at least one of the hole cavities.

7. The battery pole piece structure according to claim 1, characterized in that: The thickness of the pole piece body is 50-100 μm.

8. A battery assembly, characterized in that: The invention comprises a battery cell, wherein the battery cell comprises a positive electrode sheet and a negative electrode sheet, and at least one of the positive electrode sheet and the negative electrode sheet is constructed as the battery electrode sheet structure according to any one of claims 1 to 7.

9. The battery assembly according to claim 8, characterized in that: The battery assembly also includes a battery management module, and the acquisition component is signal-connected to the battery management module.

10. An electrical device, characterized in that: A battery assembly comprising the battery assembly of claim 8 or 9.

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