Battery structure and electronic equipment
By attaching pressure sensors to lithium-ion batteries to detect changes in cell stress, the problem of existing technologies being unable to accurately reflect internal stress is solved, enabling accurate detection and improvement of cell performance.
Patent Information
- Application Number
- CN202422322210.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-09-20
AI Technical Summary
Existing technologies cannot accurately reflect the magnitude of internal stress in lithium-ion batteries, thus affecting the long cycle life of the cells.
Pressure sensors are attached to the battery structure to detect changes in the cell's stress and accurately reflect the internal stress, which is then displayed on a pressure monitor.
It simplifies the battery structure, enables accurate detection of internal stress changes in the cell, and provides a reference for improving cell performance.
Smart Images
Figure CN223566678U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of batteries, in particular to a battery structure and an electronic device. BACKGROUND
[0002] At present, in the application scenarios of lithium ion batteries, energy storage products and commercial vehicle products have relatively high requirements for the cycle life of lithium ion batteries. How to maintain the long cycle life of the battery cell is a technical difficulty that needs to be broken through in the industry. As we all know, the charging and discharging process of the lithium ion battery is actually a process of "extraction / insertion" of lithium ions. In this process, the positive and negative electrode sheets are affected by the "extraction / insertion" of lithium ions and produce "breathing effect". The thickness of the electrode sheet changes accordingly, thereby generating internal stress of the battery cell. Due to the stress, the content of the electrolyte in the electrode sheet changes continuously, and the adhesion in the electrode sheet also changes to different degrees due to the stress change. This process will affect the long cycle life of the battery cell to some extent.
[0003] In the related art, the external stress during the charging and discharging process of the battery cell is simulated by monitoring the expansion force of the battery cell.
[0004] However, the applicant found that the stress that actually affects the cycle life is the internal stress of the battery cell. Since the lithium ion battery shell itself has a certain binding effect, the data detected by the expansion force of the battery cell in the related art cannot truly reflect the actual stress size of the internal stress of the battery cell. Utility model content
[0005] The present application provides a battery structure and an electronic device. The battery structure can detect its internal stress during the charging and discharging process, and is simple to manufacture, which has guiding significance for understanding the internal stress size of the lithium ion battery.
[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:
[0007] The first aspect of the present application provides a battery structure, which comprises:
[0008] A battery shell having a receiving cavity;
[0009] A battery cell arranged in the receiving cavity;
[0010] A pressure sensor attached to the battery cell, the pressure sensor responding to the stress change of the battery cell.
[0011] In one possible implementation, a pressure display is further included, the pressure display being fixed relative to the battery shell, and the pressure display being in communication connection with the pressure sensor to display the pressure signal transmitted by the pressure sensor as image information.
[0012] In a possible implementation, the pressure display is electrically connected with the pressure sensor through a first wire.
[0013] In a possible implementation, the battery shell comprises a shell body and a connecting cover plate, the shell body has an opening, the connecting cover plate covers the opening, the connecting cover plate is provided with a through hole, and the first wire is arranged to pass through the through hole to be electrically connected between the pressure display and the pressure sensor.
[0014] In a possible implementation, the connecting cover plate is provided with an explosion-proof valve, and the through hole is arranged on the explosion-proof valve.
[0015] In a possible implementation, the first wire is sealingly connected to the through hole.
[0016] In a possible implementation, a sealing layer is arranged between the first wire and the through hole.
[0017] In a possible implementation, the pressure sensor is bonded to the battery cell.
[0018] In a possible implementation, the pressure sensor is a flexible thin film type sensor.
[0019] The battery structure provided in the first aspect of the application has at least the following beneficial effects:
[0020] The battery structure is simple to manufacture, can detect the stress change of the battery cell in the battery charging and discharging process through the pressure sensor attached to the battery cell, truly reflects the internal stress of the battery cell, and correlates the battery cell performance with the actual internal stress, thereby providing a reference basis for researchers to judge the internal stress of the battery cell during the development process of the battery cell and improve the performance of the battery cell.
[0021] The second aspect of the application provides an electronic device comprising a device body and the battery structure provided in any one of the technical solutions.
[0022] The electronic device provided in the second aspect of the application has all the beneficial effects of the battery structure provided in the first aspect of the application, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.
[0024] Fig. 1A front view of a battery structure provided for an embodiment of the present application;
[0025] Fig. 2 A top view of a battery structure provided for an embodiment of the present application;
[0026] Fig. 3 A planar expansion view of a battery structure provided for an embodiment of the present application.
[0027] Explanation of reference signs:
[0028] 100, battery shell;
[0029] 110, shell body; 111, accommodating cavity;
[0030] 120, connecting cover plate;
[0031] 121, explosion-proof valve; 1211, avoiding through hole;
[0032] 200, battery cell;
[0033] 210, tab; 220, connecting piece;
[0034] 300, pressure sensor;
[0035] 400, first wire.
[0036] Through the above drawings, the specific embodiments of the present application have been shown, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0037] As described in the background, in the application scenario of lithium ion batteries, energy storage products and commercial vehicle products have relatively high requirements for the cycle life of lithium ion batteries. How to maintain the long cycle life of the battery cell is a technical difficulty that needs to be broken through in the industry. As is known to all, the charging and discharging process of lithium ion battery is actually a process of "extraction / insertion" of lithium ions. In this process, the positive and negative electrode sheets are affected by the "extraction / insertion" of lithium ions and produce "breathing". The thickness of the electrode sheet changes, thereby generating internal stress of the battery cell. Due to the stress, the content of the electrolyte in the electrode sheet changes continuously, and the internal adhesion of the electrode sheet also changes to different degrees due to the change of stress. This process will affect the long cycle life of the battery cell to some extent.
[0038] In the related art, the external stress size in the charging and discharging process of the battery cell is simulated by monitoring the expansion force of the battery cell.
[0039] However, the applicant finds that the stress that actually affects the cycle life is actually the stress inside the battery cell, and since the lithium ion battery shell itself has a certain binding effect, the data detected by the battery cell expansion force in the related art cannot truly reflect the actual stress size inside the battery cell.
[0040] To solve the above technical problems, the battery structure provided by the embodiments of the present application is simple to manufacture, can detect the stress change of the battery cell during the charging and discharging process of the battery through the pressure sensor attached to the battery cell, truly reflects the internal stress of the battery cell, and correlates the performance of the battery cell with the actual internal stress, thereby providing a reference basis for researchers to judge the internal stress of the battery cell during the development process of the battery cell and improve the performance of the battery cell.
[0041] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more apparent and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.
[0042] Reference Figs. 1 to 3 The battery structure provided by the embodiments of the present application includes: a battery shell 100 having a receiving cavity; a battery cell 200 arranged in the receiving cavity; and a pressure sensor 300 attached to the battery cell 200, the pressure sensor 300 responding to the stress change of the battery cell 200, wherein the pressure sensor 300 is a micro sensor.
[0043] In this way, the battery structure is simple to manufacture, can detect the stress change of the battery cell 200 during the charging and discharging process of the battery through the pressure sensor 300 attached to the battery cell 200, truly reflects the internal stress of the battery cell 200, and correlates the performance of the battery cell 200 with the actual internal stress, thereby providing a reference basis for researchers to judge the internal stress of the battery cell 200 during the development process of the battery cell 200 and improve the performance of the battery cell 200.
[0044] In some embodiments, a pressure display is further included, the pressure display being fixed relative to the battery shell 100, and the pressure display being in communication connection with the pressure sensor 300 to display the pressure signal transmitted by the pressure sensor 300 as image information.
[0045] In some embodiments, the pressure display is electrically connected with the pressure sensor 300 through a first wire 400.
[0046] Exemplarily, the diameter of the first wire 400 is 0.05-0.2 mm, for example, the diameter of the first wire 400 is 0.05 mm, or the diameter of the first wire 400 can also be 0.1 mm, or the diameter of the first wire 400 is 0.2 mm.
[0047] In some embodiments, the battery shell 100 includes a shell body 110 having an opening and a connecting cover plate 120 covering the opening, the connecting cover plate 120 is provided with a relief hole 1211, the first wire 400 is electrically connected between the pressure display and the pressure sensor 300 through the relief hole 1211, so that the first wire 400 can be led out from the inside of the battery cell 200 by setting the relief hole 1211 on the connecting cover plate 120 of the battery, which is convenient for connecting with the pressure display.
[0048] In some embodiments, the connecting cover plate 120 is provided with a pressure relief valve 121, and the pressure relief valve 121 is provided with a relief hole 1211, so that the pressure relief valve 121 will automatically open when the internal pressure of the battery is too high, releasing the internal pressure, preventing the battery from exploding or rupturing due to overpressure, and in the normal use process of the battery, a certain gas may be generated inside, causing the pressure to rise. The pressure relief valve 121 can release part of the gas when the pressure reaches a certain threshold, keeping the internal pressure of the battery within a safe range and ensuring the safe use of the battery cell.
[0049] In some embodiments, the first wire 400 is sealingly connected to the relief hole 1211, and further, the hole diameter of the relief hole 1211 is matched with the diameter of the first wire 400, improving the sealing performance of the two.
[0050] In some embodiments, a sealing layer is provided between the first wire 400 and the relief hole 1211.
[0051] In some embodiments, the pressure sensor 300 is bonded to the battery cell 200, exemplarily, the battery cell 200 is a roll cell, and the pressure sensor 300 is attached to any area inside the roll cell, and the pressure sensor 300 is bonded to the roll cell by adhesive tape, and further, the battery cell 200 has a tab 210, and the tabs between two battery cells are connected by a connecting sheet 220.
[0052] In some embodiments, the sealing layer is an aluminum repair agent layer, wherein the aluminum repair agent layer includes epoxy resin and aluminum powder, so that the aluminum repair agent layer can effectively fill and seal the gap between the wire and the opening of the pressure relief valve 121, prevent the electrolyte or other substances inside the battery from leaking, and thus ensure the safety and stability of the battery.
[0053] In some embodiments, the pressure sensor 300 is a flexible thin film type sensor, which is arranged to have strong acid and corrosion resistance. Further, the diameter of the sensing area of the pressure sensor 300 is 8-12 mm. For example, the diameter of the sensing area of the pressure sensor 300 is 8 mm, or the diameter of the sensing area of the pressure sensor 300 is 12 mm, or the diameter of the sensing area of the pressure sensor 300 is 10 mm.
[0054] On the basis of the above-mentioned embodiments, the pressure sensor 300 can be improved by being provided with a data storage unit. The pressure sensor 300 has a data output port. In this way, the pressure sensor 300 can store stress information of the detected battery cell 200 through the data storage unit, and export the stored data through a U disk connected to the data output port.
[0055] For example, the specific manufacturing process of the battery structure provided by the embodiments of the present application is as follows: the pressure sensor 300 is connected with the wire in advance, then the lithium ion battery double-wound core assembled with the cover plate is unfolded, the pressure sensor 300 can be attached to any area inside the wound core according to the needs, and the position is fixed with adhesive tape. Then the wire is passed through the avoidance through hole 1211 of the explosion-proof valve 121 connected to the cover plate 120, and the wound core is combined, the wound core is pasted with adhesive tape according to the conventional assembly method, and the shell periphery is welded, then the gap between the explosion-proof valve 121 and the hole position of the wire is sealed and filled with aluminum repair agent. The structure of the battery cell 200 continues to be manufactured, and after the capacity is completed, the wire is connected with the pressure display, and at this time, the battery charging and discharging can be observed to observe the stress change inside the battery cell 200.
[0056] It should be noted that the capacity refers to charging and discharging cycles of the battery to measure and record the actual capacity of each battery, and classify the batteries according to the capacity. Through the capacity, the batteries with unqualified capacity or unstable performance can be screened out, so as to improve the quality and consistency of the final product.
[0057] In a second aspect, the embodiments of the present application provide an electronic device, which includes a device main body and the battery structure provided by any one of the embodiments of the first aspect.
[0058] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0059] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.
[0060] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, 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 between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0061] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate 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 can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0062] The embodiments or implementations in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.
[0063] It should be noted that the "one embodiment", "embodiment", "exemplary embodiment", "some embodiments" and the like in the specification mean that the embodiments can include specific features, structures or characteristics, but not necessarily every embodiment includes the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such features, structures or characteristics in combination with other embodiments explicitly or implicitly described.
[0064] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A battery structure, characterized in that, include: The battery casing (100) has a receiving cavity (111); The battery housing (100) includes a connecting cover plate (120), the connecting cover plate (120) is provided with an explosion-proof valve (121), and the explosion-proof valve (121) is provided with an avoidance through hole (1211); The battery cell (200) is disposed within the receiving cavity (111); A pressure sensor (300) is attached to the battery cell (200) and the pressure sensor (300) responds to stress changes in the battery cell (200).
2. The battery structure according to claim 1, characterized in that, It also includes a pressure display, which is fixed relative to the battery housing (100) and is communicatively connected to the pressure sensor (300) to display the pressure signal transmitted by the pressure sensor (300) as image information.
3. The battery structure according to claim 2, characterized in that, The pressure display and the pressure sensor (300) are electrically connected via a first wire.
4. The battery structure according to claim 3, characterized in that, The battery housing (100) includes a housing body (110) having an opening, a connecting cover (120) covering the opening, and a first wire passing through the clearance through hole (1211) and electrically connected between the pressure display and the pressure sensor (300).
5. The battery structure according to claim 4, characterized in that, The first wire is sealed to the clearance through hole (1211).
6. The battery structure according to claim 5, characterized in that, A sealing layer is provided between the first conductor and the clearance through hole (1211).
7. The battery structure according to any one of claims 1-6, characterized in that, The pressure sensor (300) is bonded to the battery cell (200).
8. The battery structure according to claim 7, characterized in that, The pressure sensor (300) is a flexible thin-film sensor.
9. An electronic device, characterized in that, It includes the main body of the device and the battery structure as described in any one of claims 1-8.