Energy storage battery and energy storage device

Abstract

The utility model provides an energy storage battery and an energy storage device, and relates to the technical field of pressure detection, the energy storage battery comprises a battery assembly and a pressure sensor; the battery assembly comprises a plurality of battery blocks which are arranged at intervals, and the pressure sensor is a continuous S-shaped fabric type sensor; the fabric type sensors are attached to the two opposite side faces of each battery block. According to the energy storage battery, the pressure sensor can be connected with the signal acquisition module only through one cable interface, so that the cost is reduced, and the installation is simple; meanwhile, the fabric type sensor in a continuous S shape can be bent, so that the fabric type sensor can cover a plurality of side surfaces of the outer surfaces of the battery blocks and test the battery blocks from small pressure to large pressure, and compared with a thin film type pressure sensor, the pressure sensor has a larger pressure test range. The problems that thin film type pressure sensors used in an existing energy storage device are mutually independent, cost is high, and installation is complex are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure detection, and more specifically, to an energy storage battery and an energy storage device. Background Technology

[0002] Lithium-ion batteries are among the most widely used energy storage batteries, favored for their high energy density, long lifespan, and relatively good environmental performance. When lithium batteries are used in energy storage applications, pressure mainly comes from two aspects. First, lithium batteries are typically assembled into battery packs using multiple batteries connected in series and parallel. In this case, fixing components are needed to apply a certain degree of pressure to secure the battery pack. Second, during normal charge-discharge cycles, lithium-ion deintercalation and side reactions lead to internal gas production and the formation of the SEI film, causing the battery to expand and generating pressure that acts in reverse on the battery itself. Appropriate pressure can make the contact between the positive and negative electrodes and the separator inside the battery tighter, improving the battery's charge-discharge reaction interface, reducing internal resistance and polarization, thus improving the battery's cycle stability and high-rate charge-discharge performance. However, excessive pressure can damage the pore structure of the electrode materials and separator, deteriorate the reaction interface, rapidly decrease battery capacity, and in severe cases, cause internal short circuits and thermal runaway risks. Therefore, it is necessary to detect and provide early warning of the expansion force between energy storage battery packs.

[0003] Currently, common battery pressure and expansion force detection devices generally include thin-film pressure sensors and their matching data acquisition units. Thin-film pressure sensors typically have an array-distributed multi-sensor structure. The array density of pressure sensing points varies depending on the size and area of ​​the battery pack, and cost considerations. A typical thin-film pressure sensor consists of upper and lower electrode layers, upper and lower sensing layers, an insulating bonding layer, and an encapsulation layer. However, thin-film pressure sensors are not resistant to bending. When used in energy storage devices with multiple battery packs, a pressure sensor needs to be installed between adjacent battery packs, and each sensor requires an external interface. This leads to higher costs and more complex installation. Utility Model Content

[0004] Therefore, in order to solve the problems of independent thin-film pressure sensors, high cost, and complex installation in existing energy storage devices, this utility model provides an energy storage battery and energy storage device, the specific technical solution of which is as follows:

[0005] On one hand, an energy storage battery includes a battery assembly and a pressure sensor; the battery assembly includes a plurality of spaced-apart battery blocks, and the pressure sensor is a continuous S-shaped fabric sensor; the fabric sensor is attached to two opposite sides of each battery block.

[0006] For the aforementioned energy storage battery, the pressure sensor only needs to be connected to the signal acquisition module through a single cable interface, which reduces costs and simplifies installation. At the same time, the continuous S-shaped fabric-type sensor can be bent, which is beneficial for covering multiple sides of the battery block, enabling the testing of pressures between battery blocks from small to large pressures. Compared with thin-film pressure sensors, it has a larger pressure testing range.

[0007] Furthermore, the battery assembly includes a housing, and the battery blocks are arranged vertically at intervals within the housing; the pressure sensors are respectively connected to the upper and lower sides and either the left or right end face of each battery block.

[0008] Furthermore, the pressure sensor includes, in descending order, an upper encapsulation layer, a pressure sensing layer, a vertical electrode layer, an insulating layer, a horizontal electrode layer, and a lower encapsulation layer.

[0009] Furthermore, the upper encapsulation layer and / or the lower encapsulation layer is a flame-retardant fabric, the flame-retardant fabric has a waterproof coating, and the weight of the flame-retardant fabric is 80g to 300g.

[0010] Furthermore, the pressure sensing layer is a functional conductive fabric; the functional conductive fabric is woven from conductive yarns, and the resistance range of the functional conductive fabric is 0.0001MΩ to 0.1MΩ.

[0011] Furthermore, the conductive yarns of the transverse electrode layer are laid flat on the lower encapsulation layer at equal intervals by sewing with an embroidery machine.

[0012] Furthermore, the insulating layer is a paper-based or cloth-based single-sided adhesive, which is longitudinally bonded to the transverse electrode layer at equal intervals.

[0013] Furthermore, the conductive yarns of the vertical electrode layer are laid flat on the insulating layer at equal intervals by sewing with an embroidery machine.

[0014] On the other hand, an energy storage device includes a housing, a signal acquisition and processing module, and an energy storage battery; the energy storage battery is disposed inside the housing, and the signal acquisition and processing module is electrically connected to the pressure sensor via a connecting cable.

[0015] Furthermore, it also includes a display module and an alarm module disposed on the housing; the display module and the alarm module are electrically connected to the signal acquisition and processing module, respectively. Attached Figure Description

[0016] The present invention can be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale; rather, the focus is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0017] Figure 1 This is a schematic diagram of the structure of an energy storage battery according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the layer structure of the pressure sensor according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the energy storage device according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Battery assembly; 2. Pressure sensor; 3. Housing; 4. Signal acquisition and processing module; 5. Energy storage battery; 6. Connecting cables; 7. Display module;

[0022] 11. Battery module; 12. Casing;

[0023] 201. Upper encapsulation layer; 202. Pressure sensing layer; 203. Vertical electrode layer; 204. Insulating layer; 205. Horizontal electrode layer; 206. Lower encapsulation layer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit its scope of protection.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] In this utility model, "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0028] On the one hand, such as Figure 1As shown, an energy storage battery according to one embodiment of the present invention includes a battery assembly 1 and a pressure sensor 2; the battery assembly 1 includes a plurality of battery blocks 11 arranged at intervals, and the pressure sensor 2 is a continuous S-shaped fabric sensor; the fabric sensor is attached to two opposite sides of each battery block 11.

[0029] The aforementioned energy storage battery allows the pressure sensor 2 to be connected to the signal acquisition module via a single cable interface, which reduces costs and simplifies installation. Furthermore, the continuous S-shaped fabric sensor is flexible and can be covered on multiple sides of the battery block 11, enabling testing of pressures ranging from small to large between the battery blocks 11. Compared to thin-film pressure sensors, it offers a wider pressure testing range.

[0030] In one embodiment, the battery assembly 1 includes a housing 12, and battery blocks 11 are vertically spaced within the housing 12; the pressure sensors 2 are respectively connected to the upper and lower sides and either the left or right end face of each battery block 11. Thus, by integrating the battery blocks 11 and the pressure sensors 2 within the housing 12, modular production of the energy storage battery is facilitated.

[0031] like Figure 2 As shown, in one embodiment, the pressure sensor 2 includes, from top to bottom, an upper encapsulation layer 201, a pressure sensing layer 202, a vertical electrode layer 203, an insulating isolation layer 204, a horizontal electrode layer 205, and a lower encapsulation layer 206. Thus, there is no insulating layer between the pressure sensing layer 202 and the electrode layers, which is beneficial for testing pressures ranging from small to large pressures between the battery blocks 11.

[0032] In one embodiment, the upper encapsulation layer 201 and / or the lower encapsulation layer 206 is a flame-retardant fabric with a waterproof coating, and the flame-retardant fabric has a basis weight of 80g to 300g. Thus, the flame-retardant fabric with a waterproof coating helps to isolate adjacent battery blocks 11, mitigating the impact of damage or combustion of one battery block 11 on the other.

[0033] In one embodiment, the pressure-sensing layer 202 is a functional conductive fabric; the functional conductive fabric is woven from conductive yarns, and the resistance range of the functional conductive fabric is 0.0001MΩ to 0.1MΩ. Specifically, the basis weight is 90g to 200g, and the thickness is 0.1mm to 0.3mm.

[0034] In one embodiment, the conductive yarns of the transverse electrode layer 205 are laid flat on the lower encapsulation layer 206 at equal intervals by sewing with an embroidery machine.

[0035] In one embodiment, the insulating layer 204 is a paper-based or cloth-based single-sided adhesive, which is longitudinally bonded to the transverse electrode layer 205 at equal intervals. Specifically, the width of the single-sided adhesive of each insulating layer 205 is 2mm to 10mm wider than the conductive yarn, thereby isolating the transverse electrode layer 205 and the vertical electrode layer 203.

[0036] In one embodiment, the conductive yarn of the vertical electrode layer 203 is laid evenly on the insulating layer 205 by an embroidery machine. Specifically, the conductive yarn is made of electroplated silver nylon yarn twisted with polyester yarn, and is laid evenly on the insulating layer 205 by an embroidery machine. The tensile strength of the conductive yarn is ≥10N, and the diameter of the conductive yarn is 0.15mm to 1mm. Thus, the conductive yarn has excellent mechanical properties, is not easy to break during embroidery, and its price is only 1 / 100 of that of stainless steel sewing thread and 1 / 10 of that of silver-plated conductive yarn.

[0037] In one embodiment, the upper encapsulation layer 201 and the lower encapsulation layer 206 are heat-sealed by applying a 0.3cm to 1cm wide hot melt adhesive strip along their edges and then pressing them together. The hot melt adhesive strip is made of TPU or nylon, the pressing temperature is 120℃ to 150℃, and the pressing time is 15 seconds to 45 seconds. This hot melt adhesive strip encapsulation improves the long-term fatigue resistance of the sensor encapsulation and avoids the adhesive layer delamination problem that might occur with double-sided adhesive encapsulation of the pressure sensor 2.

[0038] On the other hand, such as Figure 3 As shown, an energy storage device according to one embodiment of the present invention includes a housing 3, a signal acquisition and processing module 4, and an energy storage battery 5; the energy storage battery 5 is disposed inside the housing 3, and the signal acquisition and processing module 4 is electrically connected to the pressure sensor 2 via a connecting cable 6. Thus, the pressure sensor 2 sends a voltage signal to the signal acquisition and processing module 4 via the connecting cable 6.

[0039] In one embodiment, a display module 7 and an alarm module are also included, both disposed on the housing 3; the display module 7 and the alarm module are electrically connected to the signal acquisition and processing module 4, respectively. Thus, the display module 7 displays the voltage signal acquired by the signal acquisition and processing module 4. When the voltage signal exceeds a preset value, the signal acquisition and processing module 4 sends an alarm signal to the alarm module, which then activates an alarm, providing real-time pressure monitoring and early warning for all battery cells 11 within the energy storage battery 5, thereby improving the overall safety of the energy storage device.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An energy storage battery, characterized in that, Includes a battery assembly (1) and a pressure sensor (2); The battery assembly (1) includes a plurality of spaced battery blocks (11), and the pressure sensor (2) is a continuous S-shaped fabric sensor. The fabric-type sensor is attached to two opposite sides of each battery block (11).

2. The energy storage battery according to claim 1, characterized in that, The battery assembly (1) includes a housing (12), and the battery blocks (11) are arranged at intervals in the housing (12) in a vertical direction; The pressure sensor (2) is connected to the upper and lower sides and either the left or right end face of each battery block (11).

3. The energy storage battery according to claim 1, characterized in that, The pressure sensor (2) includes an upper encapsulation layer (201), a pressure sensing layer (202), a vertical electrode layer (203), an insulating layer (204), a horizontal electrode layer (205), and a lower encapsulation layer (206) arranged sequentially from top to bottom.

4. The energy storage battery according to claim 3, characterized in that, The upper encapsulation layer (201) and / or the lower encapsulation layer (206) is a flame-retardant fabric, the flame-retardant fabric has a waterproof coating, and the weight of the flame-retardant fabric is 80g to 300g.

5. The energy storage battery according to claim 3, characterized in that, The pressure sensing layer (202) is a functional conductive cloth; The functional conductive fabric is made of interwoven conductive yarns, and the resistance range of the functional conductive fabric is 0.0001MΩ to 0.1MΩ.

6. The energy storage battery according to claim 3, characterized in that, The conductive yarns of the transverse electrode layer (205) are laid flat on the lower encapsulation layer (206) at equal intervals by embroidery machine stitching.

7. The energy storage battery according to claim 3, characterized in that, The insulating layer (204) is a single-sided adhesive with paper or cloth base, and the single-sided adhesive is longitudinally bonded to the transverse electrode layer (205) at equal intervals.

8. The energy storage battery according to claim 3, characterized in that, The conductive yarns of the vertical electrode layer (203) are laid flat on the insulating layer at equal intervals by embroidery machine stitching.

9. An energy storage device, characterized in that, It includes a housing (3), a signal acquisition and processing module (4), and an energy storage battery (5) as described in any one of claims 1 to 8; The energy storage battery (5) is disposed inside the outer casing (3), and the signal acquisition and processing module (4) is electrically connected to the pressure sensor (2) via a connecting cable (6).

10. An energy storage device according to claim 9, characterized in that, It also includes a display module (7) and an alarm module disposed on the housing (3); The display module (7) and the alarm module are electrically connected to the signal acquisition and processing module (4), respectively.

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