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KR-102963436-B1 - BATTERY SWELLING MEASURING APPARATUS AND DIAGNOSIS SYSTEM FOR BATTERY USING THE SAME

KR102963436B1KR 102963436 B1KR102963436 B1KR 102963436B1KR-102963436-B1

Abstract

A battery swelling measuring device and a battery diagnostic system using the same are disclosed. A battery swelling measuring device according to one embodiment of the present invention is a battery swelling measuring device that measures a pressure value according to swelling of each of a plurality of battery cells embedded in a battery pack by forming a spacing space of a predetermined interval between them, and comprises: a plurality of pressurizing parts disposed on the opposing surface of adjacent battery cells among the plurality of battery cells in the spacing space and moving according to the volume change of each battery cell; and a plurality of sensor parts disposed between adjacent pressurizing parts among the plurality of pressurizing parts and measuring pressure applied from the adjacent pressurizing parts.

Inventors

  • 서진우
  • 강동우

Assignees

  • 리볼틱스 주식회사

Dates

Publication Date
20260513
Application Date
20240823

Claims (12)

  1. A battery swelling measuring device that measures pressure values according to swelling of each of a plurality of battery cells embedded in a battery pack by forming a spacing space of a predetermined interval between them. A plurality of pressurizing members disposed on the opposing surfaces of adjacent battery cells among the plurality of battery cells in the above-mentioned spaced-apart space and moving according to the volume change of each battery cell; and It includes a plurality of sensor units positioned between adjacent pressure units among the plurality of pressure units and measuring pressure applied from the adjacent pressure units. Each of the above plurality of pressurizing parts is, It is formed in a plate shape corresponding to one surface of the battery cell and is provided with a projection that protrudes toward a sensor part facing one of the plurality of sensor parts. Each of the above plurality of sensor parts is, A battery swelling measuring device, which is a flex sensor formed in a plate shape corresponding to one side of the battery cell.
  2. In claim 1, Each of the above plurality of sensor parts is, An elastic member having elasticity and having a cross-section formed in a wave form; and It includes a deformation measuring sensor attached to one surface of the elastic member to measure pressure applied by deformation of the elastic member, The above-mentioned adjacent pressurized parts are, A battery swelling measuring device that is moved to apply pressure to the deformation measuring sensor by the battery cell when the battery cell expands by charging, and is moved by the elastic member when the battery cell contracts by discharging.
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  4. In claim 1, The above protrusion is, A battery swelling measuring device formed according to a preset arrangement in each of the plurality of pressure parts, wherein each pressure part is arranged so as not to correspond to each other in adjacent pressure parts.
  5. In claim 1, Each of the above plurality of sensor parts is, A battery swelling measuring device, which is a flex sensor positioned such that both end surfaces of one side each contact one surface of the adjacent pressure part.
  6. In claim 1, Each of the above plurality of sensor parts is, A battery swelling measuring device, which is a flex sensor positioned such that each of its two sides contacts one surface of the adjacent pressure part.
  7. A battery pack comprising a plurality of battery cells embedded by forming a spacing space of a predetermined interval between them; A battery swelling measuring device disposed in the spacing space of the battery pack to measure a pressure value according to the swelling of the plurality of battery cells; and The battery diagnostic device includes receiving a pressure value corresponding to swelling of each of the plurality of battery cells during the charge/discharge cycle of the battery pack from the battery swelling measuring device, calculating a swelling index of each of the plurality of battery cells based on the input pressure value corresponding to swelling of each of the plurality of battery cells, and diagnosing the battery pack by comparing a previously stored initial swelling index with each of the calculated swelling indices. The above battery swelling measuring device is, A plurality of pressurizing members disposed on the opposing surfaces of adjacent battery cells among the plurality of battery cells in the above-mentioned spaced-apart space and moving according to the volume change of each battery cell; and It includes a plurality of sensor units positioned between adjacent pressure units among the plurality of pressure units and measuring pressure applied from the adjacent pressure units. Each of the above plurality of pressurizing parts is, It is formed in a plate shape corresponding to one surface of the battery cell and is provided with a projection that protrudes toward a sensor part facing one of the plurality of sensor parts. Each of the above plurality of sensor parts is, A battery diagnostic system, which is a flex sensor formed in a plate shape corresponding to one side of the battery cell.
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  9. A battery pack comprising a plurality of battery cells embedded by forming a spacing space of a predetermined interval between them; A battery swelling measuring device disposed in the spacing space of the battery pack to measure a pressure value according to the swelling of the plurality of battery cells; and The battery diagnostic device includes receiving a pressure value corresponding to swelling of each of the plurality of battery cells during the charge/discharge cycle of the battery pack from the battery swelling measuring device, calculating a swelling index of each of the plurality of battery cells based on the input pressure value corresponding to swelling of each of the plurality of battery cells, and diagnosing the battery pack by comparing a previously stored initial swelling index with each of the calculated swelling indices. The above battery diagnostic device is, An input module that receives a pressure value corresponding to the swelling of each of the plurality of battery cells during the charge-discharge cycle of the battery pack from the battery swelling measuring device, and receives the number of charge-discharge cycles of the battery pack from the battery swelling device; A measurement module for measuring charging information while the above battery pack is being charged or discharged; A swelling detection module that calculates a swelling index for each of the plurality of battery cells based on a pressure value according to swelling of each of the plurality of battery cells during the charge-discharge cycle of the battery pack, the number of charge-discharge cycles, previously stored battery pack characteristic information, and charging information measured from the measurement module; and A battery diagnostic system comprising a diagnostic module that diagnoses the condition of each of the plurality of battery cells by comparing the initial swelling index stored above with the plurality of calculated swelling indices.
  10. In claim 9, The initial swelling index stored above is, It is calculated based on the pressure value according to swelling of each of a plurality of battery cells during a pre-set charging and discharging cycle input from the battery swelling measuring device, pre-stored battery pack characteristic information, and pre-set charging information measured from the measuring module. The above-mentioned pre-set period is a battery diagnostic system, which is from the first charge/discharge cycle to the Nth charge/discharge cycle.
  11. In claim 9, The above swelling detection module is, A battery diagnostic system that calculates the swelling index of each of the plurality of battery cells using the following mathematical formula 1. [Mathematical Formula 1] (Here, S is the swelling index of each battery cell, w1 , w2 , w3 , w4 , w5 , w6 are weights, is the amount of change in the sensor's pressure value during the charge/discharge cycle, is the amount of temperature change during the charge/discharge cycle, is the amount of voltage change during the charge/discharge cycle, is the amount of change in resistance during the charge/discharge cycle, ε is the change in capacity during the charge/discharge cycle, N is the number of charge/discharge cycles of the battery, , , , , ≡ ,
  12. In claim 9, The above diagnostic module is, A battery diagnostic system that calculates a recovery rate by extracting pressure values due to swelling at the start of charging, pressure values due to swelling at the completion of charging, and pressure values due to swelling at the completion of discharging for each of a plurality of battery cells based on pressure values due to swelling of each of a plurality of battery cells during a charge-discharge cycle input from the battery swelling measuring device, and diagnoses the state of each of the plurality of battery cells based on the calculated recovery rate.

Description

Battery Swelling Measuring Apparatus and Battery Diagnostic System Using the Same Embodiments of the present invention relate to a battery swelling measuring device and a technology for diagnosing a battery using the same. With the recent rapid development of industries such as electronics and telecommunications, high-output lithium-ion batteries are being widely used. They are not only utilized in portable electronic devices like mobile phones and laptops, but their use is also expanding to medium and large-sized devices requiring high output and power, such as power tools, electric bicycles, and automobiles. For this reason, large-capacity battery modules are being implemented by connecting multiple battery cells in series or parallel to apply lithium-ion batteries to medium-to-large devices requiring high output and high power. Lithium-based batteries swell upon charging, and while the swelling disappears upon discharging, repeated charging and discharging may not fundamentally eliminate the swelling, leading to a bulging phenomenon. If this swelling becomes severe, the product is deemed defective. Therefore, a means to measure the degree of swelling of such battery modules is required. Meanwhile, lithium-ion batteries may lose their functionality due to abnormal use, such as over-discharging or over-charging, but even when used normally, their ability to store electrical energy gradually decreases with the number of charge and discharge cycles. In the case of electric vehicles, when the battery capacity drops to approximately 80% or less of its initial capacity, it is replaced due to operational issues such as reduced driving range, slower charging speed, and increased safety risks. These replacement batteries have a capacity of about 80%, so depending on the condition of the battery, they can be reused as electric vehicle batteries or repurposed to be used for purposes other than electric vehicle batteries. Therefore, in order to reuse, remanufacture, or recycle used batteries, their condition must be accurately analyzed. One method for analyzing battery condition is to determine it by measuring swelling. However, existing swelling measurement technology requires disassembling and dismantling battery modules, and in particular, since used battery cells form different external appearances, there is a problem in accurately determining the condition of the battery by measuring swelling. FIG. 1 is a front view showing a battery pack including a battery swelling measuring device according to a first embodiment of the present invention. FIG. 2 is a front view showing the operation of a battery swelling measuring device by enlarging portion A of FIG. 1. FIG. 3 is a plan view showing the operation of a battery swelling measuring device by enlarging a portion of a battery pack including a battery swelling measuring device according to a second embodiment of the present invention. FIG. 4 is a front view showing the operation of a battery swelling measuring device by enlarging a portion of a battery pack including a battery swelling measuring device according to a third embodiment of the present invention. FIG. 5 is a front view showing the operation of a battery swelling measuring device by enlarging a portion of a battery pack including a battery swelling measuring device according to a fourth embodiment of the present invention. FIG. 6 is an exploded perspective view showing a battery swelling measuring device by enlarging a portion of a battery pack including a battery swelling measuring device according to a fourth embodiment of the present invention. FIG. 7 is a front view showing the operation of a battery swelling measuring device by enlarging a portion of a battery pack including a battery swelling measuring device according to a fifth embodiment of the present invention. FIG. 8 is an exploded perspective view showing a battery swelling measuring device by enlarging a portion of a battery pack including a battery swelling measuring device according to a fifth embodiment of the present invention. FIG. 9 is a configuration diagram for explaining a battery diagnostic system according to an embodiment of the present invention. FIG. 10 is a block diagram illustrating a battery diagnostic device of a battery diagnostic system according to an embodiment of the present invention. FIG. 11 is a configuration diagram illustrating a battery diagnostic system according to another embodiment of the present invention. FIG. 12 is a flowchart illustrating a battery diagnostic method according to an embodiment of the present invention. FIG. 13 is a flowchart illustrating a battery diagnostic method according to another embodiment of the present invention. FIG. 14 is a block diagram illustrating a computing environment including a computing device suitable for use in exemplary embodiments. Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed des