Electrochemical device and electric apparatus

Abstract

The application discloses an electrochemical device and an electric device. The electrochemical device comprises a battery cell module and a shell. The shell is used for accommodating the battery cell module. The shell comprises a first side wall and a second side wall arranged along a first direction. The shell further comprises a support part arranged on at least one of the first side wall and the second side wall. The support part is configured to generate irreversible structural changes when the electrochemical device is impacted along a second direction perpendicular to the first direction. The application can determine whether the impact force causes damage to the battery cell module by checking whether the support part generates irreversible structural changes, thereby facilitating the detection of the reliability of the electrochemical device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and in particular to an electrochemical device and an electric equipment. BACKGROUND

[0002] The electrochemical device may be damaged to the internal battery module after being impacted. In many cases, the change in appearance of the electrochemical device after being impacted is difficult to be observed, which is not conducive to judging whether the internal battery module is damaged. Further, it is difficult to judge whether the electrochemical device is usable, and the reliability of the electrochemical device in use is reduced. SUMMARY

[0003] Therefore, the present application provides an electrochemical device which is convenient to detect whether the battery module is damaged.

[0004] Some embodiments of the present application provide an electrochemical device, which includes a battery module and a shell. The shell is used to accommodate the battery module, and the shell includes a first side wall and a second side wall arranged along a first direction. The shell further includes a support part provided on at least one of the first side wall and the second side wall. The support part is configured to generate irreversible structural changes when the electrochemical device is impacted in a second direction perpendicular to the first direction.

[0005] The electrochemical device described above can be impacted in the second direction. The impact force acts on the support part. By checking whether the support part generates irreversible structural changes, it can be judged whether the impact force damages the battery module inside the electrochemical device, which is conducive to the detection of the reliability of the electrochemical device.

[0006] In some embodiments, the side of the first side wall away from the battery module is provided with two protruding parts. The support part is connected to the two protruding parts. A gap is provided between the support part and the first side wall. The support part is configured to be broken when the electrochemical device is impacted in the second direction.

[0007] The provision of the protruding parts is conducive to the installation of the support part and also facilitates the formation of the gap between the support part and the first side wall. The provision of the gap facilitates the reduction of the connection strength between the support part and the first side wall, which is conducive to the breaking of the support part when it is impacted in the second direction.

[0008] In some embodiments, the support part includes two first parts and a second part connected between the two first parts. One of the first parts is connected to one of the two protruding parts, and the other of the first parts is connected to the other of the two protruding parts. The first part is configured to be separated from the protruding part when the electrochemical device is impacted in the second direction.

[0009] The first part and the protrusion are separated in the above manner, which facilitates the intuitiveness of the irreversible structural change of the support portion.

[0010] In some embodiments, the protrusion comprises a first wall connected to the first sidewall, the first wall extending along the first direction, the first part being connected to the first wall along the first direction, the width of the first part being smaller than the width of the second part along the first direction.

[0011] The width of the first part along the first direction is smaller than the width of the second part along the first direction in the above manner, which facilitates the reduction of the connection strength between the first part and the protrusion, the easier irreversible structural change of the support portion, the reduction of the risk that the battery module is damaged under impact while the support portion does not have an observable structural change, and further facilitates the detection of whether the battery module is damaged under impact.

[0012] In some embodiments, the width of the first part along the first direction gradually increases in a direction from the first part to the second part.

[0013] The width of the first part along the first direction gradually increases in a direction from the first part to the second part in the above manner, which facilitates the reduction of the connection area between the first part and the protrusion and the connection strength between the first part and the protrusion while improving the area of the support portion and the equipment main body for mutual support, and further facilitates the stability of the electrochemical device installation.

[0014] In some embodiments, the two protrusions are arranged at intervals along a third direction, the length of the first part along the third direction is smaller than the length of the second part along the third direction, and the third direction is perpendicular to each of the first direction and the second direction.

[0015] The length of the first part along the third direction is smaller than the length of the second part along the third direction in the above manner, which facilitates the improvement of the area of the second part, the area of the support portion and the equipment main body for mutual support, and further facilitates the stability of the electrochemical device installation.

[0016] In some embodiments, the support portion comprises two first parts and a second part connected between the two first parts, one of the first parts is connected to one of the two protrusions, the other of the first parts is connected to the other of the two protrusions, and the second part has a weak area configured to break itself when the electrochemical device is impacted along the second direction.

[0017] The second part breaks itself in the above manner, which facilitates the intuitiveness of the irreversible structural change of the support portion, and further facilitates the judgment of whether the battery module inside the electrochemical device is damaged.

[0018] In some embodiments, the second portion gradually increases in width along the first direction towards one of the first portions, and gradually increases in width along the first direction towards the other of the first portions.

[0019] The above arrangement is advantageous in reducing the structural strength of the weak area while increasing the area of mutual support between the support portion and the device body, thereby improving the stability of the electrochemical device installation.

[0020] In some embodiments, the first side wall is provided with two protrusions on the side facing away from the battery cell module, and the support portion is connected to the two protrusions and the first side wall.

[0021] The above arrangement of connecting the support portion to the first side wall is advantageous in improving the connection strength between the support portion and the first side wall, and is suitable for cases where the battery cell module is damaged under a large impact.

[0022] In some embodiments, each protrusion is provided with a recess, and one second portion is connected to the recess, and another second portion is connected to the other recess.

[0023] The above arrangement of the first recess and the second recess allows both first portions to be separated from the first side wall, i.e., the first portions are not connected to the first side wall, thereby reducing the risk of the support portion not being separated from the first side wall or the protrusions after the battery cell module is damaged by an impact.

[0024] In some embodiments, the support portion is curved along the second direction.

[0025] The above arrangement of the support portion being curved along the second direction allows the support portion to elastically deform when subjected to an impact and the impact force is not sufficient to cause irreversible structural changes to the support portion, thereby reducing the movement of the electrochemical device under the impact, and thus providing a buffering and damping effect on the electrochemical device.

[0026] In some embodiments, the housing further comprises an elastic portion, the elastic portion being connected to the first side wall and the support portion.

[0027] The above arrangement of the support portion being subjected to an impact force, and the elastic portion being able to exert a force opposite to the impact force on the support portion, is advantageous in reducing the movement of the electrochemical device under the impact, and thus providing a buffering and damping effect on the electrochemical device.

[0028] In addition, the present application also provides a power-using device that facilitates detection of whether the battery cell electrochemical device can continue to be used.

[0029] Some embodiments of the present application provide a power-using device, which comprises a device body and an electrochemical device according to any of the above embodiments, and the electrochemical device is installed on the device body.

[0030] The support portion of the electrochemical device irreversibly changes in structure when the electrochemical device is impacted, which is conducive to detecting whether the electrochemical device is usable, and further reduces the probability that the electrical equipment uses an abnormal electrochemical device, and improves the reliability of the electrical equipment.

[0031] The shell of the electrochemical device in the present application further includes a support portion provided on at least one of the first side wall and the second side wall, and the support portion is configured to irreversibly change in structure when the electrochemical device is impacted in a second direction perpendicular to the first direction. After the electrochemical device is impacted in the second direction, the impact force acts on the support portion, and whether the impact force causes damage to the battery cell module inside the electrochemical device can be determined by checking whether the support portion irreversibly changes in structure, which is conducive to detecting the reliability of the electrochemical device. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A schematic diagram of an electrical equipment is provided for an embodiment of the present application.

[0033] Figure 2 An explosion schematic diagram of an electrochemical device is provided for an embodiment of the present application.

[0034] Figure 3 An explosion schematic diagram of a battery cell unit is provided for an embodiment of the present application.

[0035] Figure 4 A structural schematic diagram of an electrochemical device is provided for an embodiment of the present application.

[0036] Figure 5 A structural schematic diagram of an electrochemical device is provided for an embodiment of the present application.

[0037] Figure 6 A partial schematic diagram of an electrochemical device is provided for an embodiment of the present application.

[0038] Figure 7 A structural schematic diagram of an electrochemical device is provided for an embodiment of the present application.

[0039] Figure 8 A partial schematic diagram of an electrochemical device is provided for an embodiment of the present application.

[0040] Figure 9 A structural schematic diagram of an electrochemical device is provided for an embodiment of the present application.

[0041] Figure 10 A structural schematic diagram of a first side wall and a support portion is provided for an embodiment of the present application.

[0042] Figure 11 A structural schematic diagram of an electrochemical device is provided for an embodiment of the present application.

[0043] Explanation of main element symbols

[0044] Electrochemical device 100

[0045] Battery cell module 10

[0046] Battery cell unit 11

[0047] Packing case 111

[0048] Electrode assembly 112

[0049] Electrode terminal 113

[0050] Cushion 12

[0051] Circuit board 13

[0052] Housing 20

[0053] First side wall 21

[0054] Gap 210

[0055] Second side wall 22

[0056] Third side wall 23

[0057] Fourth side wall 24

[0058] Fifth side wall 25

[0059] Sixth side wall 26

[0060] Support portion 27

[0061] First portion 271

[0062] Second portion 272

[0063] Weak area 272a

[0064] Protrusion 28

[0065] Recess 280

[0066] First wall 281

[0067] Second wall 282

[0068] Elastic portion 30

[0069] Fixing plate 31

[0070] Cushioning plate 32

[0071] Battery compartment 201

[0072] Device main body 200

[0073] Electric device 1000

[0074] First direction X

[0075] Second direction Y

[0076] Third direction Z DETAILED DESCRIPTION

[0077] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application.

[0078] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or a middle component can exist at the same time. When a component is considered to be "provided on" another component, it can be directly provided on the other component or a middle component can exist at the same time.

[0079] It should be noted that when two components or components are "electrically connected", it can be considered that the two components are directly in contact, welded, bonded, or the like to realize electrical conduction.

[0080] The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and the like used herein are for illustrative purposes only.

[0081] The term "vertical" is used to describe the ideal state between two components. In the actual production or use state, there can be an approximate vertical state between the two components. For example, in combination with numerical description, vertical can refer to the included angle between two straight lines in the range of 90°±10°, vertical can also refer to the dihedral angle between two planes in the range of 90°±10°, and vertical can also refer to the included angle between a straight line and a plane in the range of 90°±10°. The two components described as "vertical" can not be absolute straight lines or planes, but can be approximately straight lines or planes, and as a whole, the overall extension direction is a straight line or a plane, which can be considered as a "straight line" or a "plane".

[0082] It should be noted that when a parameter is greater than, equal to, or less than an endpoint value, it should be understood that the endpoint value allows a tolerance of ±10%, such as A greater than B by 10, which should be understood to include A greater than B by 9, and A greater than B by 11.

[0083] Unless otherwise specified, the term "a plurality of" used in the present application refers to two or more.

[0084] 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 application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0085] The application discloses an electrochemical device, which comprises an electric core module and a shell. The shell is used for containing the electric core module and comprises a first side wall and a second side wall arranged along a first direction. The shell further comprises a support part arranged on at least one of the first side wall and the second side wall. The support part is configured to generate irreversible structural change when the electrochemical device is impacted along a second direction perpendicular to the first direction.

[0086] After the electrochemical device is impacted along the second direction, the impact force acts on the support part. Whether the impact force causes damage to the electric core module in the electrochemical device can be determined by checking whether irreversible structural change occurs in the support part, which is beneficial to the detection of the reliability of the electrochemical device.

[0087] Some embodiments of the application will be described in detail below with reference to the drawings. The following embodiments and features of the embodiments can be combined with each other without conflict.

[0088] Referring to Figure 1 The application provides a kind of electric equipment 1000, and electric equipment 1000 includes device main body 200 and electrochemical device 100, electrochemical device 100 is installed in device main body 200.

[0089] In some embodiments, referring to Figure 1 Device main body 200 includes battery compartment 201, and electrochemical device 100 is installed in battery compartment 201 and is supported with each other.

[0090] In some embodiments, electric equipment 1000 can be aircraft, electric vehicle or electric two-wheeled vehicle, etc., which is not specifically limited here.

[0091] Referring to Figure 2 The application provides electrochemical device 100, which comprises electric core module 10 and shell 20. Shell 20 is used for containing electric core module 10, and comprises first side wall 21, second side wall 22 and support part 27. First side wall 21 and second side wall 22 are arranged along first direction X, and support part 27 is arranged on at least one of first side wall 21 and second side wall 22 to support battery compartment 201.

[0092] In some embodiments, referring to Figure 2 And Figure 3The battery cell module 10 includes a battery cell unit 11, the battery cell unit 11 including a packaging shell 111, an electrode assembly 112, and an electrode terminal 113, the packaging shell 111 being configured to accommodate the electrode assembly 112, the electrode terminal 113 being connected to the electrode assembly 112 and at least partially protruding from the packaging shell 111 to lead out the polarity of the electrode assembly 112.

[0093] In some embodiments, referring to Figure 2 The number of the battery cell unit 11 can be two or more, and the plurality of battery cell units 11 are stacked and arranged with a buffer pad 12 between adjacent battery cell units 11, and the plurality of battery cell units 11 can be connected by the electrode terminal 113 to achieve parallel or series connection.

[0094] In some embodiments, the packaging shell 111 is made of flexible aluminum plastic film, and in other embodiments, the aluminum plastic film can be replaced by a hard plastic shell or an alloy aluminum shell.

[0095] In some embodiments, the buffer pad 12 can be made of soft materials such as foam sheet and silica gel pad.

[0096] In some embodiments, the electrode assembly 112 includes a positive electrode sheet (not shown), a negative electrode sheet (not shown), and a separator film (not shown) arranged between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the negative electrode sheet, and the separator film can be stacked or wound after being stacked.

[0097] In some embodiments, the positive electrode sheet and the negative electrode sheet are formed by combining an active material layer on a metal layer, and different polarity electrode sheets are made of different metal materials. The positive electrode sheet can be made of positive electrode paste combined on at least one metal layer such as aluminum, platinum, nickel, tantalum, titanium, etc., and the positive electrode paste combined on the metal layer forms a positive electrode active material layer. The negative electrode sheet can be made of negative electrode paste combined on at least one metal layer such as copper, platinum, nickel, tantalum, titanium, etc., and the negative electrode paste combined on the metal layer forms a negative electrode active material layer. For example, the positive electrode sheet includes a metal aluminum layer, and the negative electrode sheet includes a metal copper layer.

[0098] In some embodiments, the separator film can be a polyethylene film, a polypropylene film, a polyester film, or a polyimide film, etc. which can be insulated to separate the positive electrode sheet and the negative electrode sheet.

[0099] In some embodiments, the electrode terminal 113 is divided into a positive electrode terminal 113 and a negative electrode terminal 113, the positive electrode terminal 113 being electrically connected to the positive electrode sheet, and the negative electrode terminal 113 being electrically connected to the negative electrode sheet.

[0100] In some embodiments, the material of the electrode terminal 113 can be an electrolyte-resistant conductive material such as a steel alloy, an aluminum alloy, an iron alloy, a copper alloy, or a nickel alloy. For example, the electrode terminal 113 connected to the positive electrode tab is made of an aluminum metal plate, and the electrode terminal 113 connected to the negative electrode tab is made of a copper metal plate.

[0101] In some embodiments, referring to Figure 2 , the battery cell module 10 further includes a circuit board 13, which can be electrically connected to the electrode terminals 113 of the plurality of battery cell units 11. In some embodiments, the circuit board 13 is configured as a BMS (Battery Management System) board, which can collect parameters such as voltage, temperature, current, and voltage of the plurality of battery cell units 11 to monitor the operating state of the battery cell units 11, thereby improving the reliability of the battery cell units 11.

[0102] In some embodiments, referring to Figure 2 , the housing 20 further includes a third side wall 23 and a fourth side wall 24 arranged along a second direction Y, and a fifth side wall 25 and a sixth side wall 26 arranged along a third direction Z, the first direction X being perpendicular to the second direction Y and the third direction Z. The first side wall 21, the second side wall 22, the third side wall 23, the fourth side wall 24, the fifth side wall 25, and the sixth side wall 26 enclose to accommodate the battery cell module 10.

[0103] In some embodiments, referring to Figure 2 and Figure 4 , the first side wall 21 is provided with a support portion 27, which is used to support the battery compartment 201 and the electrochemical device 100. When the electrochemical device 100 is impacted, the impact force is transmitted to the support portion 27. The support portion 27 is configured to produce irreversible structural changes when the electrochemical device 100 is impacted in the second direction Y perpendicular to the first direction X. Irreversible structural changes can be understood as damage, cracking, breaking, or deformation that cannot be restored to the original state. By observing whether the support portion 27 produces irreversible structural changes, it is beneficial to determine whether the impact force damages the battery cell module 10, thereby facilitating the detection of the reliability of the electrochemical device 100.

[0104] In some embodiments, the first side wall 21 and the second side wall 22 are both connected to the support portion 27, which is used to support the battery compartment 201 of the equipment body 200. This is beneficial to improve the stability of the installation of the electrochemical device 100 and to make the impact force on the support portion 27 more uniform.

[0105] In some embodiments, the first side wall 21 is provided with the support part 27, and the second side wall 22, the third side wall 23, the fourth side wall 24, the fifth side wall 25 or the sixth side wall 26 is filled with a flexible material such as foam, silica gel or rubber between the battery compartment 201, so as to improve the stability of the electrochemical device 100 installation, and reduce the movement and collision of the electrochemical device 100 when impacted. In other embodiments, at least one of the third side wall 23, the fourth side wall 24, the fifth side wall 25 or the sixth side wall 26 is also provided with the support part 27, which will not be described here.

[0106] For the convenience of understanding, the following is described by taking the connection between the first side wall 21 and the support part 27 as an example.

[0107] In some embodiments, referring to Figure 4 and Figure 5 , the gap 210 is provided between the support part 27 and the first side wall 21, and the support part 27 is configured to be broken when the electrochemical device 100 is impacted in the second direction Y. The provision of the gap 210 is conducive to reducing the connection strength between the support part 27 and the first side wall 21, and is conducive to realizing the breaking of the support part 27 when impacted in the second direction Y. The breaking of the support part 27 includes the disconnection of the connection between the support part 27 and other components, and the breaking of the support part 27 also includes the disconnection of the structure of the support part 27 itself.

[0108] In some embodiments, referring to Figure 4 and Figure 5 , the side of the first side wall 21 away from the battery cell module 10 is provided with two protrusions 28, and the support part 27 is connected to the two protrusions 28 to indirectly connect with the first side wall 21. The provision of the protrusions 28 is conducive to the installation of the support part 27 and the formation of the gap 210 between the support part 27 and the first side wall 21.

[0109] In some embodiments, referring to Figure 4 and Figure 5 , the two protrusions 28 are arranged in the third direction Z, and the two protrusions 28 are arranged in the form of strip-shaped protrusions extending in the second direction Y, so that a channel capable of limiting is formed between the two protrusions 28, which is convenient for limiting the part in the battery compartment 201 for mutual support with the support part 27 between the two protrusions 28, thereby improving the stability of the electrochemical device 100 installed on other components.

[0110] In some embodiments, referring to Figure 4 and Figure 5The support part 27 comprises two first parts 271 and a second part 272 connected between the two first parts 271, the second part 272 is used to support the battery compartment 201, one first part 271 is connected with one of the two protrusions 28, and the other first part 271 is connected with the other of the two protrusions 28. The first part 271 is configured to be disconnected at the position connected with the protrusion 28 when the electrochemical device 100 is impacted in the second direction Y, and to be separated from the protrusion 28. The separation of the first part 271 and the protrusion 28 facilitates the intuitiveness when the irreversible structural change of the support part 27 occurs. When the electrochemical device 100 is impacted in the second direction Y, both of the first parts 271 can be separated from the corresponding connected protrusion 28, or one of the first parts 271 can be separated from the corresponding connected protrusion 28, and the other first part 271 can not be separated from the corresponding connected protrusion 28.

[0111] In some embodiments, referring to Figure 4 The protrusion 28 comprises a first wall 281 connected with the first side wall 21, the first wall 281 extends in the first direction X, the first part 271 is connected with the first wall 281 in the first direction X, the width of the first part 271 is smaller than the width of the second part 272 in the first direction X, which facilitates to reduce the connection strength between the first part 271 and the protrusion 28, to make the support part 27 more likely to have irreversible structural change, to reduce the damage of the battery cell module 10 after impact, and to facilitate the detection of whether the battery cell module 10 is damaged under impact.

[0112] In some other embodiments, referring to Figure 6 The support part 27 comprises a first part 271 and a second part 272 connected with the first part 271, the first part 271 is directly connected with the first side wall 21, a gap 210 is formed between the second part 272 and the first side wall 21, the second part 272 is used to support the battery compartment 201, and plays a role in supporting the electrochemical device 100. When the electrochemical device 100 is impacted in the second direction Y, the impact force is transmitted to the second part 272 and the first part 271, and the connection between the first part 271 and the first side wall 21 is disconnected. The first part 271 can be one, two or more than two.

[0113] In other embodiments, the first part 271 is configured to be damaged by bending or concave when the electrochemical device 100 is impacted in the second direction Y.

[0114] In some embodiments, referring to Figure 7 The first part 271 can be provided as a triangular plate.

[0115] In some embodiments, referring to Figure 4 to Figure 7The two protrusions 28 are arranged at intervals along the third direction Z, and the length of the first portion 271 along the third direction Z is less than the length of the second portion 272 along the third direction Z, which is beneficial to increase the area of the second portion 272, thereby increasing the area of the support portion 27 for mutual support with the battery compartment 201, and further beneficial to improve the stability of the installation of the electrochemical device 100.

[0116] In some embodiments, the thickness of the first portion 271 and the second portion 272 along the second direction Y is consistent, and for example, the thickness of the first portion 271 and the second portion 272 along the second direction Y is 1mm-3mm, and specifically can be 1mm, 2mm or 3mm.

[0117] In some embodiments, the width of the first portion 271 along the first direction X is 2mm-4mm, and the width of the second portion 272 along the first direction X is 5mm-8mm.

[0118] For example, when the electrochemical device 100 falls and is subjected to an impact force of about 1500N under the impact of acceleration, the battery cell module 10 is damaged. The width of the second portion 272 along the second direction Y is 6mm, and the width of the first portion 271 along the second direction Y is 2.7mm, and the cross-sectional area of the first portion 271 is 8.1mm 2 The first portion 271 can withstand an impact force of 1440N along the second direction Y, and when the impact force exceeds this value, the connection between the first portion 271 and the protrusion 28 is disconnected, so that when the first portion 271 is observed to be disconnected, it can be judged that the battery cell module 10 is damaged.

[0119] In some embodiments, the sum of the lengths of the first portion 271 and the second portion 272 along the second direction Y is 55mm-200mm, and specifically can be 55mm, 56mm, 57mm, 58mm, 97mm, 98mm, 99mm, 100mm, 101mm, 102mm, 198mm, 199mm or 200mm, and the like, which will not be listed one by one here.

[0120] In some other embodiments, please refer to Figure 8 The protrusion 28 includes a first wall 281 and a second wall 282, the first wall 281 extends along the first direction X and is connected with the first side wall 21, and the second wall 282 extends along the second direction Y and is connected with the first wall 281, the first portion 271 is connected with the second wall 282, and the thickness of the first portion 271 along the second direction Y is less than the thickness of the second portion 272 along the second direction Y, which is beneficial to reduce the connection strength of the first portion 271 and the protrusion 28.

[0121] In some embodiments, please refer to Figure 9The second portion 272 has a weak area 272a configured to break by itself when the electrochemical device 100 is impacted in the second direction Y, and the first portion 271 does not break or does not break by itself when the electrochemical device 100 is impacted in the second direction Y. The way the second portion 272 breaks by itself is conducive to improving the intuitiveness of the irreversible structural change of the support portion 27, and thus conducive to judging whether the battery cell module 10 inside the electrochemical device 100 is damaged.

[0122] In some embodiments, referring to Figure 9 In the first direction X, the width of the weak area 272a is smaller than the width of the first portion 271, which reduces the structural strength of the weak area 272a and is conducive to the weak area 272a breaking first when the support portion 27 is impacted.

[0123] In some embodiments, referring to Figure 9 The weak area 272a is formed with a V-shaped notch, and in other embodiments, the weak area 272a is formed with two symmetrical V-shaped notches.

[0124] In some embodiments, referring to Figure 10 The first side wall 21 is provided with two protrusions 28 away from the battery cell module 10, and the support portion 27 is connected to the two protrusions 28 and is also connected to the first side wall 21. Connecting the support portion 27 to the first side wall 21 is conducive to improving the connection strength between the support portion 27 and the first side wall 21, and is suitable for the case where the battery cell module 10 is damaged under a larger impact.

[0125] In some embodiments, referring to Figure 10 The support portion 27 includes two first portions 271 and a second portion 272 connected between the two first portions 271, and the second portion 272 is connected to the first side wall 21, and the two first portions 271 are not connected to the first side wall 21, so that the support portion 27 is not completely connected to the first side wall 21, reducing the risk that the support portion 27 does not break away from the first side wall 21 or the protrusions 28 after the battery cell module 10 is damaged by impact.

[0126] In some embodiments, referring to Figure 10In the two protrusions 28, one protrusion 28 is provided with a recess 280 on the side facing the other protrusion 28. One first portion 271 is connected with one protrusion 28 and located in the recess 280 of the protrusion 28, and the other first portion 271 is connected with the other protrusion 28 and located in the recess 280 of the protrusion 28, so that the two first portions 271 are both away from the first side wall 21, that is, the first portions 271 are not connected with the first side wall 21, which reduces the risk that the support portion 27 is not separated from the first side wall 21 or the protrusion 28 after the battery cell module 10 is damaged by impact.

[0127] In some embodiments, referring to Figure 10 , the support portion 27 is arranged to be curved along the second direction Y, so that when the support portion 27 is impacted and the impact force is not enough to cause irreversible structural change of the support portion 27, the support portion 27 elastically deforms, which is beneficial to reduce the movement of the electrochemical device 100 under impact, thereby playing a role of buffering and damping for the electrochemical device 100.

[0128] In some embodiments, referring to Figure 10 , one side of the support portion 27 in the second direction Y is used to support the battery compartment 201, and the support portion 27 protrudes and curves towards the second direction Y, so that the support portion 27 can deform in the direction opposite to the second direction Y. In some other embodiments, one side of the support portion 27 in the direction opposite to the second direction Y is used to support the battery compartment 201, and the support portion 27 protrudes and curves towards the direction opposite to the second direction Y, so that the support portion 27 can deform in the second direction Y.

[0129] In some embodiments, referring to Figure 11 , the shell 20 further comprises an elastic portion 30, the elastic portion 30 is connected with the first side wall 21, and the elastic portion 30 is also connected with the support portion 27. When the support portion 27 is impacted, the elastic portion 30 can exert a force opposite to the impact force on the support portion 27, which is beneficial to reduce the movement of the electrochemical device 100 under impact, thereby playing a role of buffering and damping for the electrochemical device 100.

[0130] In some embodiments, referring to Figure 11 , the elastic portion 30 can be located on one side of the support portion 27 in the second direction Y, or on the other side in the second direction Y, or elastic portions 30 can be arranged on both sides of the support portion 27 in the second direction Y.

[0131] In some embodiments, referring to Figure 11The elastic part 30 includes a fixed plate 31 and a plurality of sequentially connected buffer plates 32. The fixed plate 31 is connected with the first side wall 21. One of the plurality of buffer plates 32 is connected with the fixed plate 31. One of the plurality of buffer plates 32 is connected with the support part 27. In the third direction Z, the projections of the plurality of buffer plates 32 on the support part 27 are at least partially overlapped. When the support part 27 has a tendency to deform towards the buffer plate 32, the buffer plate 32 exerts a buffering force towards the support part 27.

[0132] In some other embodiments, the elastic part 30 can be a spring, a tension spring, a torsion spring, or the like, which is not specifically limited herein.

[0133] In some embodiments, the support part 27, the first side wall 21, the second side wall 22, the third side wall 23, the fourth side wall 24, the fifth side wall 25, and the sixth side wall 26 can be made of a plastic plate, an alloy aluminum plate, or an alloy copper plate. The materials of the support part 27, the first side wall 21, the second side wall 22, the third side wall 23, the fourth side wall 24, the fifth side wall 25, and the sixth side wall 26 can be the same or different, which is not specifically limited herein.

[0134] Please refer to Figure 1 The power consumption device 1000 in the present application adopts the technical solutions in any of the embodiments of the above-mentioned electrochemical device 100. When the electrochemical device 100 is impacted, the support part 27 irreversibly changes in structure, which is conducive to detecting whether the electrochemical device 100 is usable, thereby reducing the probability of using an abnormal electrochemical device 100 by the power consumption device 1000 and improving the reliability of the power consumption device 1000.

[0135] Since the power consumption device 1000 adopts the technical solutions in any of the embodiments of the above-mentioned electrochemical device 100, the power consumption device 1000 in the present application at least has the beneficial effects brought by any of the technical solutions of the above-mentioned electrochemical device 100, which will not be repeated here.

[0136] The present application can simulate the maximum acceleration at the moment when the device main body 200 falls or collides by collecting data such as the dead weight and self weight of the device main body 200, using simulation software. The cross-sectional area of the support portion 27 is calculated, for example, in the embodiment in which the electrochemical device 100 is impacted to cause the first portion 271 and the first side wall 21 to be separated, the cross-sectional area of the first portion 271 is calculated, and in the embodiment in which the electrochemical device 100 is impacted to cause the second portion 272 to be broken, the cross-sectional area of the weak area 272a of the second portion 272 is calculated. The simulation software is used to simulate the situation in which the support portion 27 is irreversibly structurally changed after the device main body 200 falls or collides, and the width of the support portion 27 in the first direction X, the thickness of the support portion 27 in the second direction Y, or the length of the support portion 27 in the third direction Z is adjusted based on the situation after the simulation, to adjust the cross-sectional area of the support portion 27, and further adjust the structural strength of the support portion 27 or the connection strength with the first side wall 21.

Claims

1. An electrochemical device, characterized by, The electrochemical device comprises an electric cell module and a housing for accommodating the electric cell module, the housing comprising: a first side wall; a second side wall arranged along a first direction with the first side wall; a support portion provided on at least one of the first side wall and the second side wall, the support portion being configured to produce irreversible structural change when the electrochemical device is impacted along a second direction perpendicular to the first direction; the first side wall is provided with two protruding portions on a side facing away from the electric cell module, and the support portion is connected to the two protruding portions; the support portion is connected to the first side wall; each of the protruding portions is provided with a recessed portion, the support portion is connected to one of the recessed portions, and the support portion is also connected to the other recessed portion; or the support portion comprises two first portions and a second portion connected between the two first portions, one of the first portions is connected to one of the protruding portions, the other first portion is connected to the other protruding portion, and the second portion has a weak area configured to break itself when the electrochemical device is impacted along the second direction.

2. The electrochemical device of claim 1, wherein a gap is provided between the support portion and the first side wall, and the support portion is configured to be broken when the electrochemical device is impacted along the second direction.

3. The electrochemical device of claim 2, wherein, the support portion comprises two first portions and a second portion connected between the two first portions, one of the first portions is connected to one of the protruding portions, the other first portion is connected to the other protruding portion, and the first portion is configured to be separated from the protruding portion when the electrochemical device is impacted along the second direction.

4. The electrochemical device of claim 3, wherein the protruding portion comprises a first wall connected to the first side wall, the first wall extends along the first direction, the first portion is connected to the first wall, and along the first direction, the width of the first portion is smaller than the width of the second portion.

5. The electrochemical device of claim 4, wherein, the two protruding portions are arranged apart along a third direction, along the third direction, the length of the first portion is smaller than the length of the second portion, and the third direction is perpendicular to the first direction and the second direction.

6. The electrochemical device according to any one of claims 1 to 5, wherein the support portion is curved along the second direction.

7. The electrochemical device according to any one of claims 1 to 5, wherein the housing further comprises an elastic portion connected to the first side wall and also connected to the support portion.

8. An electric device, characterized by The device body comprises the electrochemical device as claimed in any one of claims 1 to 7.

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