Detection system for bump deformation of electrochemical device

Abstract

The utility model provides a detection system for bump deformation of an electrochemical device. The detection system comprises: an electrochemical device comprising a housing and at least one cell located in the housing; the first elastic unit is attached to the surface, close to the shell side, of the battery cell and is used for feeding back deformation of the electrochemical device; the first conductive unit is connected with the first elastic unit, is attached to the surface of the battery cell on the same side of the first elastic unit, and is used for transmitting the deformation of the electrochemical device; the deformation acquisition unit is located at the position, corresponding to the first conductive unit, of the outer surface of the shell and used for acquiring the deformation quantity of the electrochemical device; the BMS control unit is located on the outer surface of the shell, connected to the deformation acquisition unit and used for controlling input and output of electric signals in the electrochemical device. According to the detection system provided by the utility model, potential safety hazards such as smoking, overheating, short circuit, fire and the like of the electrochemical device caused by overlarge deformation quantity are prevented.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electrochemical device detection control technical field relates to a kind of electrochemical device bulging deformation detection system. BACKGROUND

[0002] With the rapid rise of new energy industry, soft package or semi-solid type battery and whole package product are more and more popular, as the energy and power reserve center of new energy equipment, the safety requirement of single soft package battery and battery assembly is higher and higher, as soft package battery, "breathing" or bulging deformation appears in use process is a normal phenomenon, generally in the range of 5%-10%.However, if the use process is due to overcharge, overheating, or short circuit under extreme conditions, soft package battery bulging exceeds the normal range value may cause structure on the wire break, battery or battery pack whole package smoke, fire, or explosion and other safety hazards.

[0003] The conventional design is to increase elastomer between single or multiple, and the deformation of battery is absorbed by the elastomer.The advantage is that the process is relatively simple, and it is relatively easy to realize, but there are limitations.The bulging value of each single is a range value, which cannot be defined as a specific value.When the deformation reaches the peak value, the superimposed deformation may cause internal failure of a single battery or failure of the BMS protection system and signal acquisition system of the whole battery assembly, causing short circuit, smoke, fire and other irreversible damage, resulting in major safety hazards.Therefore, during actual use, the deformation has certain uncertainty, and the value of the deformation cannot be defined, and the uncertainty of the total deformation is amplified, and the failure probability is also amplified during actual use.

[0004] Therefore, how to solve the problem of smoke, overheating, short circuit, fire and other safety hazards caused by excessive deformation during battery bulging is worth studying. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a kind of electrochemical device bulging deformation detection system.The utility model detects the deformation of soft package battery or battery assembly by signal acquisition, controls the deformation of battery or battery assembly, and shuts down the output of the whole system when the deformation reaches the set value, to prevent smoke, overheating, short circuit, fire and other safety hazards caused by excessive deformation.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In the first aspect, the utility model provides a kind of electrochemical device bulging deformation detection system, the detection system includes:

[0008] An electrochemical device comprises a housing and at least one battery cell located in the housing.

[0009] A first elastic unit is attached to a surface of the battery cell close to the side of the housing, and is used to feedback the deformation of the electrochemical device.

[0010] A first conductive unit is connected to the first elastic unit and attached to a surface of the battery cell on the same side of the first elastic unit, and is used to transmit the deformation of the electrochemical device.

[0011] A deformation collection unit is located at an outer surface of the housing corresponding to the first conductive unit, and is used to collect the deformation value of the electrochemical device.

[0012] A BMS control unit is located at an outer surface of the housing, and is connected to the deformation collection unit, and is used to control the input and output of electrical signals in the electrochemical device.

[0013] In the utility model, when the electrochemical device is charging or discharging, and the appearance is deformed, the conductive unit will protrude together with the appearance surface of the battery cell, and the non-quantitative deformation range is converted into a quantifiable and detectable deformation value, and the elastic unit can also absorb part of the deformation of the battery cell, when the height of the deformation reaches the set height value, the upper end deformation collection unit is touched, the collection accuracy is high, the signal is fed back to the BMS control unit, and the BMS control unit will cut off the input or output of the whole system in time, so that the deformation failure caused by overcharging, overheating or short circuit of the whole system is avoided, the search system provided by the utility model can be controlled in real time, the output instruction is immediately output, the whole electrochemical device is protected, no additional power supply circuit is needed, and the electrochemical device bulge deformation can be controlled without separate power supply, in the detection system provided by the utility model, the elastic unit and the conductive unit can be located on any side of the outer surface of the battery cell, the deformation detection can be realized on the upper, lower and side surfaces, the protection can be triggered only when the deformation value reaches the protection value, and there is no special requirement for the force value or direction of the deformation, human judgment of the deformation value is not needed, the protection is triggered as soon as the deformation exceeds the design value, the main circuit is cut off to protect the whole battery pack, the reliability of batch production is high, and the quality control of the safety part of the product is more excellent.

[0014] As a preferred technical scheme in the utility model, the first elastic unit and the first conductive unit are located on at least one surface of the side of the battery cell close to the housing.

[0015] The detection system provided by the utility model can realize deformation detection of each part of the battery cell, and the control of the BMS unit can be triggered when the deformation value of any part reaches the set value, so that the detection blind area is avoided.

[0016] As one preferred technical scheme in the utility model, the first conductive unit covers all the remaining areas of the surface of the side of the battery cell close to the shell except the coverage area of the first elastic unit.

[0017] The detection system provided by the utility model can realize large-area coverage of the surface of the battery cell, can realize consistency between the detection area of the battery cell and the size of the surface of the battery cell, and can trigger the BMS unit when the deformation value of any place reaches a certain value, thereby eliminating the blind area of detection.

[0018] As one preferred technical scheme in the utility model, the first elastic unit is arranged on both sides of the surface of the side of the battery cell close to the shell along the length direction of the surface.

[0019] In the utility model, the first elastic unit is arranged on at least two sides of the surface of the battery cell, which can not only absorb deformation and fix the structure, but also will not affect the deformation monitoring of the remaining easily deformed area; further, when the length direction of the surface of the battery cell is too large, the first elastic unit can be arranged at intervals, the first elastic unit in the middle area is added according to the actual situation, and the false triggering of deformation monitoring caused by the deformation of the single battery cell itself is avoided.

[0020] As one preferred technical scheme in the utility model, the coverage width ratio of any side of the first elastic unit is ≤1 / 10, for example, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0021] It should be noted that the coverage width of any side in the utility model is the coverage width of the first elastic unit at any place along the length direction of the surface of the side of the battery cell close to the shell when the first elastic unit is arranged at multiple places on the surface of the battery cell, and the coverage width ratio is the ratio of the value of the coverage width of the first elastic unit at any place in the length of the surface of the side of the battery cell close to the shell.

[0022] In the utility model, if the coverage width of the first elastic unit is too large, although the deformation can be absorbed, the detection of the deformation range will be affected, the detectable range is relatively reduced, and the detection accuracy is affected.

[0023] As one preferred technical scheme in the utility model, the first elastic unit includes a first elastic body, the thickness of the first elastic body is 8% to 10% of the total thickness of the battery cells in the electrochemical device, for example, 8%, 8.3%, 8.5%, 8.8%, 9%, 9.3%, 9.5%, 9.8% or 10%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0024] It should be noted that the total thickness of the battery cell in the utility model is the laminated thickness of all battery cells.

[0025] In the utility model, when the thickness of the first elastic body is 8% to 10% of the total thickness of the battery cells in the electrochemical device, the deformation detection of the battery cell itself and the overall assembly of the battery cell can be better realized.

[0026] As one preferred technical scheme in the utility model, the first conductive unit includes a first conductive film.

[0027] As one preferred technical scheme in the utility model, when the electrochemical device includes at least two battery cells, a second elastic unit and a second conductive unit are further arranged between the two battery cells, and the second conductive unit is connected to the second elastic unit; the second conductive unit is used for transmitting the deformation of the electrochemical device.

[0028] In the utility model, when the electrochemical device includes a plurality of battery cell structures, elastic units and conductive units are arranged between the battery cells, and the deformation of the battery cells and the whole package is detected in multiple dimensions; if the deformation of any place exceeds the set value, the signal loop of the deformation collection unit will feed back to the BMS unit (i.e. the deformation signal of all conductive units will be fed back to the deformation collection unit), thereby realizing the protection function.

[0029] Further, in the utility model, the second elastic unit includes a second elastic body, and the second conductive unit includes a second conductive film.

[0030] The second elastic unit includes a second elastic body, and the thickness of the second elastic body is 8% to 10% of the total thickness of the battery cells in the electrochemical device, for example, 8%, 8.3%, 8.5%, 8.8%, 9%, 9.3%, 9.5%, 9.8% or 10%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0031] As one preferred technical scheme in the utility model, the electrochemical device includes a soft package battery cell or a soft package battery pack.

[0032] As one preferred technical scheme in the utility model, the power supply loop of the BMS control unit is the same as the power supply loop of the electrochemical device.

[0033] In the utility model, the power supply system of the detection circuit and the battery pack are the same power supply circuit, and separate power supply is not needed.

[0034] In addition, in the second aspect, the utility model also provides a kind of above-mentioned detection control method of electrochemical device bulge deformation, the detection control method uses the detection system detection control as described in first aspect;The detection control method comprises:

[0035] When electrochemical device is deformed, first elastic unit is connected with first conductive unit and synchronous deformation occurs, and deformation variable is transmitted to BMS control unit by deformation acquisition unit;BMS control unit controls the input and output of electrical signal in electrochemical device according to deformation variable.

[0036] Further preferably, when the electrochemical device is at least two battery cells, first elastic unit is connected with first conductive unit and synchronous deformation occurs, and / or second elastic unit is connected with second conductive unit and synchronous deformation occurs, and all deformations are transmitted to BMS control unit by deformation acquisition unit;BMS control unit controls the input and output of electrical signal in electrochemical device according to deformation variable.

[0037] It also needs to be explained that:

[0038] In the utility model, the material type of elastic body is not specially limited, and the material type of battery cell deformation feedback can be realized, and the utility model is applicable, including but not limited to flame-retardant foamed sponge pad or other alternative materials.

[0039] In the utility model, the composition of conductive film is not limited, as long as it can realize conduction transmission signal when contacting, including but not limited to aluminum foil, tin foil or other alternative materials.

[0040] In the utility model, the deformation acquisition unit in detection system is not limited, and the structure mode of feedback transmission of collected deformation signal to BMS control unit can be realized, and the utility model is applicable;

[0041] The process of conduction part in acquisition circuit is not limited, which can be mutually disconnected pad, or patch conductive sheet, or patch conductive column (the composition of conductive sheet or conductive column is not limited), or sensor that can trigger conduction signal, and the type of sensor is not limited (such as pressure sensor).

[0042] The connection mode between deformation acquisition unit and BMS control unit is not limited, which can be plug-in terminal connection, or direct welding, or other signal transmission mode.

[0043] It should be further explained that the battery cell type that can be a soft package battery is applicable to the utility model, including but not limited to liquid cell structure, solid cell structure or semi-solid cell structure, and the like, and the person skilled in the art can make adaptive selection and adjustment according to actual needs.

[0044] It should be additionally explained that the length direction of the surface of the battery cell in the utility model is the direction parallel to the output tab in the specific battery structure.

[0045] In the utility model, when a plurality of battery cell structures are included in the electrochemical device, the deformation values are transmitted to the BMS control unit through the deformation collection units at different positions, so that the detection and control of the multi-dimensional electrochemical device with multiple battery cell structures are realized.

[0046] It can be understood that the specific deformation value is not limited in the utility model (generally, 10% of the total thickness of the battery cell is taken as the critical value of the deformation value, and the protection is triggered and the main circuit is cut off to prevent the entire battery pack from being damaged when the deformation exceeds 10%), and the person skilled in the art can make adaptive selection and determination according to the type of the battery cell in the electrochemical device and the number of the battery cell.

[0047] The numerical range of the utility model includes not only the point values exemplified above, but also any point value between the above numerical ranges that is not exemplified, and the specific point values included in the range are not listed in the utility model due to the limited length and the consideration of simplicity.

[0048] Compared with the prior art, the utility model has the following beneficial effects:

[0049] In this invention, when the electrochemical device deforms during charging or discharging, the conductive unit bulges along with the surface of the individual battery cell, converting the unquantifiable deformation range into a quantifiable and detectable deformation value. Simultaneously, the elastic unit absorbs a portion of the battery cell's deformation. When the deformation height reaches a set value, it triggers the upper deformation acquisition unit, providing high-precision acquisition and feeding the signal back to the BMS control unit. Upon receiving the feedback signal, the BMS control unit promptly cuts off the system's input or output, thus preventing system failure due to overcharging, overheating, short circuits, or other deformation-related issues. Furthermore, the retrieval system provided by this invention can control the system in real time. The system immediately outputs a command to shut down the output, protecting the entire electrochemical device. It eliminates the need for an additional power supply circuit or a separate power supply to control the bulging deformation of the electrochemical device. Furthermore, the elastic and conductive units in the detection system provided by this invention can be located on either side of the cell's outer surface, allowing for deformation detection from the top, bottom, or side. Protection is triggered as long as the deformation value reaches the protection threshold, without any special requirements on the magnitude or direction of the deformation force. There is no need for manual judgment of whether the deformation is large or small; protection is immediately triggered when the deformation exceeds the design value, cutting off the main circuit to protect the entire battery pack from potential damage. Mass production offers high reliability, and the quality control of the product's safety features is superior. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the structure of a detection system for bulging deformation of a single-cell electrochemical device according to a specific embodiment of the present invention.

[0051] Figure 2 This is a schematic diagram of the structure of a detection system for bulging deformation of a multi-cell electrochemical device according to a specific embodiment of the present invention.

[0052] Figure 3 This is a schematic diagram of the structure of a detection system for bulging deformation of a multi-cell electrochemical device according to a specific embodiment of the present invention.

[0053] Among them, 1-shell, 2-battery cell, 3-first elastic unit, 4-first conductive unit, 5-deformation acquisition unit, 6-BMS control unit, 7-second elastic unit, 8-second conductive unit. Detailed Implementation

[0054] It should be understood that, in the description of the present application, the terms "center", "longitudinal", "transverse", "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 therefore cannot be understood as indicating or implying 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 limiting the present application.

[0055] It should be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "provision", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; 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, or it can be connected inside two elements. 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.

[0056] In the description of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0057] The technical scheme of the present application will be further illustrated below by combining the drawings and through specific embodiments.

[0058] In one specific embodiment, the present application provides a detection system for bulging deformation of an electrochemical device, as shown in Figure 1 and Figure 2 The detection system comprises:

[0059] An electrochemical device, comprising a shell 1 and at least one battery cell 2 located in the shell;

[0060] A first elastic unit 3 adhering to the surface of the battery cell 2 near the shell 1 side, for feeding back the deformation of the electrochemical device;

[0061] A first conductive unit 4 connected to the first elastic unit 3 and adhering to the surface of the battery cell 2 on the same side of the first elastic unit 3, for transmitting the deformation of the electrochemical device;

[0062] A deformation acquisition unit 5 located at the outer surface of the shell 1 corresponding to the position of the first conductive unit 4, for acquiring the deformation amount of the electrochemical device;

[0063] A BMS control unit 6 is arranged on the outer surface of the shell 1 and is connected to the deformation acquisition unit 5, and is used for controlling the input and output of the electric signal in the electrochemical device.

[0064] As a preferred technical solution in the embodiment, the first elastic unit 3 and the first conductive unit 4 are arranged on at least one side of the surface of the battery cell 2 close to the shell 1.

[0065] As a preferred technical solution in the embodiment, the first conductive unit 4 covers the entire remaining area of the surface of the battery cell 2 close to the shell 1, except the coverage area of the first elastic unit 3.

[0066] As a preferred technical solution in the embodiment, the first elastic unit 3 is arranged on both sides of the surface of the battery cell 2 close to the shell 1 along the length direction of the surface of the battery cell 2 close to the shell 1.

[0067] As a preferred technical solution in the embodiment, the coverage width ratio of the first elastic unit 3 on any one side is ≤1 / 10 along the length direction of the surface of the battery cell 2 close to the shell 1.

[0068] As a preferred technical solution in the embodiment, the first elastic unit 3 comprises a first elastic body, and the thickness of the first elastic body is 8%-10% of the total thickness of the battery cell in the electrochemical device.

[0069] As a preferred technical solution in the embodiment, the first conductive unit comprises a first conductive film.

[0070] As a preferred technical solution in the embodiment, as shown in Figure 3 When the electrochemical device comprises at least two battery cells 2, the second elastic unit 7 and the second conductive unit 8 are further arranged between the two battery cells 2, and the second conductive unit 8 is connected to the second elastic unit 7.

[0071] Specifically, in the utility model, the second elastic unit 7 comprises a second elastic body, and the second conductive unit 8 comprises a second conductive film.

[0072] As a preferred technical solution in the embodiment, the electrochemical device comprises a soft package battery cell or a soft package battery pack.

[0073] As a preferred technical solution in the embodiment, the power supply circuit of the BMS control unit 6 is the same as the power supply circuit of the electrochemical device.

[0074] Embodiment 1

[0075] The embodiment provides a detection system for bulging deformation of a soft package battery with a single cell structure.

[0076] The soft package battery comprises a shell 1 and at least one cell 2 (the specific model of the cell 2 is 104040) in the shell;

[0077] A first elastic unit 3 (a first elastic sponge pad, the thickness of the first elastic body is 10% of the total thickness of the cells in the soft package battery) is attached to the surface of the cell 2 close to the shell 1 side, the first elastic unit 3 is arranged on both sides of the surface of the cell 2 close to the shell 1 side, along the length direction of the surface of the cell 2 close to the shell 1, and the coverage ratio of the first elastic unit 3 on any one side is ≤1 / 10, which is used for feedback deformation of the soft package battery.

[0078] A first conductive unit 4 (a first conductive tin foil film) is connected to the first elastic unit 3 and attached to the surface of the cell 2 on the same side of the first elastic unit 3, and is used for transmitting the deformation of the soft package battery.

[0079] In addition to the coverage area of the first elastic unit 3, the first conductive unit 4 covers all the remaining areas of the surface of the cell 2 close to the shell 1 side.

[0080] A deformation collection unit 5 is arranged at the outer surface of the shell 1 at the corresponding position of the first conductive unit 4, and is used for collecting the deformation amount of the soft package battery.

[0081] A BMS control unit 6 is arranged at the outer surface of the shell 1 and connected to the deformation collection unit 5, the power supply circuit of the BMS control unit 6 is same as that of the soft package battery, and the BMS control unit 6 is used for controlling the input and output of the electrical signal in the soft package battery.

[0082] Embodiment 2

[0083] The difference between the embodiment and the embodiment 1 is that the thickness of the first elastic body in the embodiment is 8% of the total thickness of the cells in the soft package battery.

[0084] The components of the remaining detection system are consistent with those of the embodiment 1.

[0085] Embodiment 3

[0086] The difference between the embodiment and the embodiment 1 is that the thickness of the first elastic body in the embodiment is 12% of the total thickness of the cells in the soft package battery.

[0087] The components of the remaining detection system are consistent with those of the embodiment 1.

[0088] Embodiment 4

[0089] The difference between the embodiment and embodiment 1 is that the soft package battery in the embodiment is a three-electrode structure, and the embodiment further comprises a second elastic unit 7 and a second conductive unit 8 between the two electrodes 2, wherein the second conductive unit 8 is connected to the second elastic unit 7 and the BMS control unit 6.

[0090] The remaining components of the detection system are consistent with those of embodiment 1.

[0091] Comparative example 1

[0092] The difference between the comparative example and embodiment 1 is that the detection system provided in the comparative example only comprises the first elastic unit 3.

[0093] The remaining components of the detection system are consistent with those of embodiment 1.

[0094] Comparative example 2

[0095] The difference between the comparative example and embodiment 3 is that the detection system provided in the comparative example only comprises the first elastic unit 3 and the second elastic unit 7.

[0096] The remaining components of the detection system are consistent with those of embodiment 3.

[0097] From the comparison between embodiment 1 and embodiment 3, it can be concluded that when the thickness of the elastic body is too thick and exceeds 10% of the total thickness of the electrodes in the electrochemical device, it is not conducive to the detection of the deformation range, thereby affecting the detection accuracy.

[0098] From the comparison between embodiment 1 and embodiment 4, it can be concluded that when the electrochemical device comprises a multi-electrode structure, the cooperation of the multiple elastic units and the multiple conductive units is more conducive to the accurate detection of the deformation of the electrochemical device.

[0099] From the comparison between embodiment 1 and comparative example 1, and between embodiment 4 and comparative example 2, it can be concluded that in the utility model, the cooperation of the elastic unit and the conductive unit can realize the high-precision detection of the deformation of the electrochemical device.

[0100] In summary, in the utility model, when the electrochemical device is charging or discharging, the conductive unit will protrude with the appearance surface of the battery cell monomer when the appearance is deformed, and the deformation range without quantification is converted into quantifiable and detectable deformation values, and the elastic unit can also absorb part of the deformation of the battery cell, when the height of deformation reaches the set height value, the upper end deformation collection unit is touched, the collection accuracy is high, the signal is fed back to the BMS control unit, the BMS control unit receives the feedback signal and cuts off the input or output of the whole system in time, so that the deformation failure of the whole system caused by overcharge, overheating, short circuit and the like is avoided; the search system provided by the utility model can be controlled in real time, the output instruction is immediately output, the whole electrochemical device is protected, no additional power supply circuit is needed, and the electrochemical device bulge deformation can be controlled without separate power supply; in the detection system provided by the utility model, the elastic unit and the conductive unit can be located on any side of the battery cell outer surface, and the deformation detection can be realized on the upper, lower and side surfaces, only the deformation value reaches the protection value, the protection can be triggered, and the force value or direction of deformation has no special requirement; human judgment of large or small deformation is not needed, as long as the deformation exceeds the design value, the protection is triggered, the main circuit is cut off, the whole battery pack is protected, and the problem is prevented from becoming serious; the reliability of batch production is high, and the quality control of product safety parts is more excellent.

[0101] The applicant declares that the above description is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, and the skilled person in the art should understand that any change or replacement within the technical range disclosed by the utility model can be easily thought of by any person skilled in the art in the technical field, and falls within the protection scope and disclosure range of the utility model.

Claims

1. A detection system for bulging deformation of an electrochemical device, characterized in that, The detection system comprises: An electrochemical device comprising a housing and at least one cell located in the housing; A first elastic unit attached to the surface of the cell near the housing side for feeding back the deformation of the electrochemical device; A first conductive unit connected to the first elastic unit and attached to the surface of the cell on the same side of the first elastic unit for transmitting the deformation of the electrochemical device; A deformation acquisition unit located at the outer surface of the housing corresponding to the position of the first conductive unit for acquiring the deformation amount of the electrochemical device; A BMS control unit located on the outer surface of the housing connected to the deformation acquisition unit for controlling the input and output of electrical signals in the electrochemical device.

2. The detection system of claim 1, wherein, The first elastic unit and the first conductive unit are located on at least one side of the surface of the cell near the housing.

3. The detection system of claim 1, wherein, The first conductive unit covers the entire remaining area of the surface of the cell near the housing except the coverage area of the first elastic unit.

4. The detection system of claim 1, wherein, Along the length direction of the surface of the cell near the housing, the first elastic unit is arranged on at least two sides of the surface of the cell near the housing.

5. The detection system of claim 1, wherein, Along the length direction of the surface of the cell near the housing, the coverage width ratio of the first elastic unit on any one side is ≤1 / 10.

6. The detection system of claim 1, wherein, The first elastic unit comprises a first elastic body, and the thickness of the first elastic body is 8% to 10% of the total thickness of the cells in the electrochemical device.

7. The detection system of claim 1, wherein, The first conductive unit comprises a first conductive film.

8. The detection system of claim 1, wherein, When the electrochemical device comprises at least two cells, a second elastic unit and a second conductive unit are further arranged between the two cells, and the second conductive unit is connected to the second elastic unit; the second conductive unit is used for transmitting the deformation of the electrochemical device.

9. The detection system of claim 1, wherein, The electrochemical device comprises a soft-packaged battery cell or a soft-packaged battery pack.

10. The detection system of claim 1, wherein, The power supply circuit of the BMS control unit is the same as the power supply circuit of the electrochemical device.

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