Battery cell

Abstract

The utility model provides a battery cell, and relates to the technical field of batteries. Each pole group comprises a positive tab and a negative tab, the plurality of pole groups are arranged along the length direction, and the positive tab in one pole group of two adjacent pole groups is connected with the negative tab in the other pole group; a fixing assembly is arranged between every two adjacent pole groups, each fixing assembly comprises a fixing main body and a supporting piece, each fixing main body is attached to the corresponding two adjacent pole groups, each supporting piece comprises two supporting parts, the supporting parts protrude out of the corresponding fixing main body, and the two supporting parts are arranged at intervals; the shell comprises a first plate located on one side of the pole group in the width direction, the first anti-explosion valve is arranged on a first installation opening of the first plate and faces the fixing assembly, and the two supporting parts abut against the inner side wall of the shell. Therefore, a plurality of pole groups with relatively small lengths are used for replacing a pole group with relatively large length, and the length of a single pole group is relatively small, so that the risks of wrinkling, deformation, layer channeling and breakage of the pole groups are reduced, and the reject ratio of the battery cells is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to an electric core. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. As an important part of the electric core, the electrode group directly affects the quality of the electric core.

[0003] With the optimization of the electric core structure, electric cores with larger lengths have emerged. However, as the length of the electric core increases, the length of the electrode group of the electric core also increases, which increases the risks of the electrode group wrinkling, deforming, layer shifting, and breaking, and the defective rate of the electric core rises. Summary of the Utility Model

[0004] In view of this, the present application provides an electric core to solve the problem that as the length of the electric core increases, the length of the electrode group increases, which increases the risks of the electrode group wrinkling, deforming, layer shifting, and breaking, and the defective rate of the electric core rises.

[0005] The present application provides an electric core, which includes a housing, a first explosion-proof valve, a fixing component, and a plurality of electrode groups. Any one of the electrode groups includes a positive electrode tab and a negative electrode tab. The plurality of electrode groups are arranged along the length direction of the electrode group, and the positive electrode tab in one of the adjacent two electrode groups is connected to the negative electrode tab in the other electrode group;

[0006] A fixing component is arranged between any two adjacent electrode groups. The fixing component includes a fixing body and a support member. The fixing body is attached to the two adjacent electrode groups. The support member includes two support portions, and the support portions protrude from the end of the fixing body in the width direction of the electrode group. The two support portions are spaced apart along the thickness direction of the electrode group;

[0007] The housing includes a first plate on one side in the width direction of the electrode group. The first plate is provided with a first installation opening, and the first explosion-proof valve is arranged on the first installation opening. The first explosion-proof valve faces the fixing component, and both support portions are in contact with the inner side wall of the housing. The two support portions are located on both sides of the first explosion-proof valve in the thickness direction.

[0008] Preferably, the housing includes two first plates, and both first plates are provided with the first installation openings; the electric core includes two first explosion-proof valves, and the two first explosion-proof valves are respectively arranged on the two first installation openings;

[0009] The number of the support members is two, and the two support members are respectively fixed at both ends of the fixing body in the width direction.

[0010] Preferably, the fixing body includes two fixing members. Each fixing member includes a fitting plane and a receiving groove. The receiving groove is recessed from the fitting plane into the interior of the fixing member. The two fitting planes are in contact with each other, and the two receiving grooves define a receiving space. The positive tab in one of the adjacent pole groups and the negative tab in the other adjacent pole group extend into the receiving space.

[0011] Preferably, the fixing member further includes a connecting plane and a connecting groove. The connecting plane and the fitting plane are respectively located on two opposite sides of the fixing body in the thickness direction. The connecting groove is recessed from the connecting plane into the interior of the fixing member.

[0012] Preferably, ventilation holes are formed on both sides of the fixing body in the width direction. The ventilation holes communicate with the connecting groove and face the first explosion-proof valve.

[0013] Preferably, the difference between the distance between the two support portions in the support member and the dimension of the first explosion-proof valve in the thickness direction is greater than 1 mm.

[0014] Preferably, the dimension of the support portion in the width direction is greater than 0.5 mm and less than 1.5 mm.

[0015] Preferably, the battery cell includes a positive electrode cover plate and a negative electrode cover plate. The negative tab in the pole group close to the negative electrode cover plate is connected to the negative electrode cover plate, and the positive tab in the pole group close to the positive electrode cover plate is connected to the positive electrode cover plate.

[0016] Preferably, the battery cell further includes two support plates. The two support plates are respectively connected to the pole group close to the negative electrode cover plate and the pole group close to the positive electrode cover plate. The support plate is provided with a through hole penetrating through the support plate. The positive tab in the pole group close to the positive electrode cover plate passes through the through hole and is connected to the positive electrode cover plate, and the negative tab in the pole group close to the negative electrode cover plate passes through the through hole and is connected to the negative electrode cover plate.

[0017] Preferably, the dimension of the support plate in the thickness direction is greater than the distance between the two support portions in the support member, and the distance between the two support portions in the support member is greater than 10 mm.

[0018] In the battery cell of the present application, the battery cell includes a housing, a first explosion-proof valve, a fixing component, and a plurality of electrode groups. Any one of the electrode groups includes a positive electrode tab and a negative electrode tab. The plurality of electrode groups are arranged along the length direction of the electrode group. In two adjacent electrode groups, the positive electrode tab in one electrode group is connected to the negative electrode tab in the other electrode group. A fixing component is provided between any two adjacent electrode groups. The fixing component includes a fixing main body and a support member. The fixing main body is attached to the two adjacent electrode groups. The support member includes two support portions. The support portions protrude from the end of the fixing main body in the width direction of the electrode group. The two support portions are spaced apart along the thickness direction of the electrode group. The housing includes a first plate on one side in the width direction of the electrode group. The first plate is provided with a first mounting opening. The first explosion-proof valve is arranged on the first mounting opening. The first explosion-proof valve faces the fixing component. Both support portions are in contact with the inner side wall of the housing. The two support portions are located on both sides of the first explosion-proof valve in the thickness direction. The adjacent two electrode groups can be connected by the fixing component and the support plate, and then the plurality of electrode groups are connected. In this way, by replacing one electrode group with a larger length with a plurality of electrode groups with smaller lengths, the length of a single electrode group is smaller, reducing the risks of the electrode group wrinkling, deforming, layer shifting, and breaking, thereby reducing the defective rate of the battery cell. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0020] Figure 1 Exploded view of the battery cell showing the embodiments of the present utility model;

[0021] Figure 2 Planar structure schematic diagram of the battery cell showing the embodiments of the present utility model;

[0022] Figure 3 Show Figure 2 Cross-sectional view of the battery cell shown in obtained by cutting along A-A';

[0023] Figure 4 Schematic diagram of the internal structure of the housing;

[0024] Figure 5 Schematic diagram of the support plate;

[0025] Figure 6 Cross-sectional view of the fixing component;

[0026] Figure 7 Relative position diagram of a fixing main body and a support portion;

[0027] Figure 8 Schematic perspective view showing the fixing assembly.

[0028] Icons: 1 - electrode group; 11 - positive electrode tab; 12 - negative electrode tab; 2 - insulating film; 3 - support plate; 31 - through hole; 4 - fixing assembly; 41 - fixing body; 411 - fixing member; 4111 - fitting plane; 4112 - connecting plane; 4113 - first plane; 4114 - second plane; 412 - connecting groove; 413 - receiving groove; 414 - ventilation hole; 42 - support member; 421 - support portion; 43 - receiving space; 51 - positive electrode cover plate; 52 - negative electrode cover plate; 61 - first explosion-proof valve; 62 - second explosion-proof valve; 7 - side plate; 8 - housing; 81 - first plate; 82 - second plate; L1 - length direction; L2 - width direction; L3 - thickness direction. Detailed implementation manners

[0029] The following detailed implementation manners are provided to help readers obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be obvious. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein. Rather, changes that will be obvious after understanding the disclosure of the present application may be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0030] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be obvious after understanding the disclosure of the present application.

[0031] Throughout the specification, when an element (such as, a layer, a region, or a substrate) is described as "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, or there may be one or more other elements therebetween. In contrast, when an element is described as "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly above" another element, or "directly covering" another element, there may be no other elements therebetween.

[0032] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0033] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or parts, these components, elements, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or part from another. Thus, a first component, element, region, layer, or part as referred to in the examples described herein may also be referred to as a second component, element, region, layer, or part without departing from the teachings of the examples.

[0034] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations of "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0035] The terms used herein are only for describing various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0036] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the figures may occur. Thus, the examples described herein are not limited to the specific shapes shown in the figures, but include changes in shape that occur during manufacturing.

[0037] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of this application. Additionally, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of this application.

[0038] The following will be combined with Figures 1 to 8A description of the battery cell of the present application is given. In Figures 1 to 8 the length direction L1, width direction L2, and thickness direction L3 of the electrode group are perpendicular to each other in pairs.

[0039] As Figures 1 to 8 shown, the battery cell includes a housing 8, a first explosion-proof valve 61, a fixing assembly 4, and a plurality of electrode groups 1. Any electrode group 1 includes a positive electrode tab 11 and a negative electrode tab 12. The plurality of electrode groups 1 are arranged along the length direction L1 of the electrode group 1. The positive electrode tab 11 in one electrode group 1 is connected to the negative electrode tab 12 in another adjacent electrode group 1. A fixing assembly 4 is provided between any two adjacent electrode groups 1. The fixing assembly 4 includes a fixing body 41 and a support member 42. The fixing body 41 is in contact with two adjacent electrode groups 1. The support member 42 includes two support portions 421. The support portions 421 protrude from the end of the fixing body 41 in the width direction L2 of the electrode group 1. The two support portions 421 are spaced apart along the thickness direction L3 of the electrode group 1. The housing 8 includes a first plate 81 on one side in the width direction L2 of the electrode group 1. The first plate 81 is provided with a first mounting opening. The first explosion-proof valve 61 is disposed on the first mounting opening. The first explosion-proof valve 61 faces the fixing assembly 4. Both support portions 421 are in contact with the inner sidewall of the housing 8. The two support portions 421 are located on both sides of the first explosion-proof valve 61 in the thickness direction L3. The adjacent two electrode groups 1 can be connected by the fixing assembly 4, and then the plurality of electrode groups 1 can be connected. In this way, by using a plurality of electrode groups 1 with smaller lengths to replace one electrode group 1 with a larger length, the length of a single electrode group 1 is smaller, and the risk of bending deformation of the electrode group 1 is reduced, thereby reducing the defective rate of the battery cell.

[0040] In addition, the support portion 421 protrudes relative to the electrode group 1 and is in contact with the inner sidewall of the first plate 81. The two support portions 421 are respectively located on both sides of the first explosion-proof valve 61, which can prevent the fixing assembly 4 from scratching the first explosion-proof valve 61 when the electrode group 1 is inserted into the housing.

[0041] Optionally, the number of electrode groups 1 in the battery cell can be selected according to requirements, such as two, three, four, or more.

[0042] In an embodiment of the present application, as Figure 1 shown, the housing 8 includes two first plates 81 and two second plates 82. The first plates 81 and the second plates 82 are alternately arranged. The first plates 81 are perpendicular to the width direction L2, and the second plates 82 are perpendicular to the thickness direction L3. A positive electrode cover plate 51 and a negative electrode cover plate 52 are respectively provided at both ends of the housing 8 in the length direction L1. The positive electrode tab 11 of the electrode group 1 close to the positive electrode cover plate 51 is welded, and the negative electrode tab 12 of the electrode group 1 close to the negative electrode cover plate 52 is welded.

[0043] Further, each of the two first plates 81 is provided with a first mounting opening; the battery cell includes two first explosion-proof valves 61, and the two first explosion-proof valves 61 are respectively arranged on the two first mounting openings. The fixing assembly 4 includes two support members 42, and the two support members 42 are respectively arranged on both sides of the fixing body 41 in the width direction L2. The two support portions 421 in one support member 42 are in contact with the inner side wall of one first plate 81, and the two support portions 421 in the other support member 42 are in contact with the inner side wall of the other first plate 81, so as to prevent the two first explosion-proof valves 61 from being scratched when the electrode group 1 is inserted into the housing.

[0044] In addition, side plates 7 are arranged on both sides of each electrode group 1 in the width direction L2. The insulating film 2 covers the electrode group 1 and the side plates 7, and the housing 8 covers the insulating film 2. The insulating film 2 is provided with an opening corresponding to the position of the first mounting opening, so that when thermal runaway occurs, the gas can flow towards the first explosion-proof valve 61.

[0045] As Figure 1 and Figure 3 , the battery cell includes two second explosion-proof valves 62. The negative electrode cover plate 52 includes a second mounting opening, and the positive electrode cover plate 51 includes a third mounting opening. The two second explosion-proof valves 62 are respectively arranged on the second mounting opening and the third mounting opening. As Figure 3 shown, the gas in the middle of the battery cell can be quickly discharged through the two first explosion-proof valves 61, and the gas on both sides can be quickly discharged through the two second explosion-proof valves 62. Through the cooperation of the two first explosion-proof valves 61 and the two second explosion-proof valves 62, the exhaust efficiency can be improved, the airway stroke can be shortened, and thus the safety of the battery cell can be improved.

[0046] As Figure 6 , Figure 7 and Figure 8 shown, the fixing body 41 includes two fixing members 411. The two support portions 421 included in the support member 42 are arranged on the same side of the two fixing members 411 in the width direction L2, that is, the entire fixing assembly 4 includes four support portions 421, and each fixing member 411 is provided with support portions 421 on both sides in the width direction L2. The fixing member 411 includes a fitting plane 4111 and a receiving groove 413. The receiving groove 413 is recessed from the fitting plane 4111 towards the inside of the fixing member 411. The two fitting planes 4111 are fitted, and the two receiving grooves 413 enclose a receiving space 43. The positive electrode tab 11 in one electrode group 1 and the negative electrode tab 12 in the other electrode group 1 among two adjacent electrode groups 1 extend into the receiving space 43, and the connection part of the positive electrode tab 11 and the negative electrode tab 12 is located in the through space.

[0047] Optionally, as Figure 2 and Figure 6As shown, the difference between the distance b between the two support portions 421 in the support member 42 and the dimension d of the first explosion-proof valve 61 in the thickness direction L3 is greater than 1 mm, that is, d - b > 1 mm. This allows for a sufficient distance between the two support portions 421 included in the support member 42 to ensure that the support portions 421 will not scratch the first explosion-proof valve 61 during the process of inserting the battery cell into the casing.

[0048] Preferably, the dimension c of the support portion 421 in the width direction L2 is greater than 0.5 mm and less than 1.5 mm, that is, 0.5 mm < c < 1.5 mm. In this way, while ensuring that the two support portions 421 can cooperate to support and fix the main body 41, the dimension of the support portion 421 in the width direction L2 is reduced, and the space occupied by the support portion 421 is decreased.

[0049] Preferably, the positive electrode tab 11 and the negative electrode tab 12 adopt a horizontal welding method, such that a part of the positive electrode tab 11 in one of the adjacent two electrode groups 1 overlaps with the negative electrode tab 12 in the other electrode group 1 along the thickness direction L3 of the electrode group 1. In this way, the space occupied by the positive electrode tab 11 and the negative electrode tab 12 in the length direction L1 can be reduced, thereby increasing the space that the electrode group 1 in the casing 8 can occupy, and thus enhancing the capacity density of the battery cell.

[0050] As Figure 6 、 Figure 7 and Figure 8 shown, the fixing member 411 further includes a connecting plane 4112 and a connecting groove 412. The connecting plane 4112 and the fitting plane 4111 are respectively located on two opposite sides of the fixing member 411, and the connecting groove 412 is recessed from the connecting plane 4112 into the interior of the fixing member 411.

[0051] In addition, ventilation holes 414 are provided on both sides of the fixing member 411 in the width direction L2. The ventilation holes 414 communicate with the connecting groove 412, and the ventilation holes 414 face the first explosion-proof valve 61. By providing the ventilation holes 414 and the connecting groove 412, in the event of thermal runaway, the gas in the middle can quickly converge to the location of the first explosion-proof valve 61 through the connecting groove 412 and the ventilation holes 414 to be discharged from the first explosion-proof valve 61, thereby enhancing the safety of the battery cell.

[0052] As Figure 7 and Figure 8 shown, the fixing member 411 includes a first plane 4113 and a second plane 4114 that are opposite to each other in the length direction L1. The two first planes 4113 of the two fixing members 411 are attached to the same support plate 3, and the two second planes 4114 of the two fixing members 411 are attached to another support plate 3. The fixing assembly 4 is formed by assembling two fixing members 411, which allows for the installation of the two fixing members 411 after welding the positive electrode tab 11 and the negative electrode tab 12, improving the convenience of welding the positive electrode tab 11 and the negative electrode tab 12.

[0053] In the embodiments of the present application, as Figure 1 and Figure 5 shown, the battery cell further includes two support plates 3, and the two support plates 3 are respectively connected to the electrode groups 1 close to the negative electrode cover plate 52 and the positive electrode cover plate 51. The support plate 3 is provided with a through hole 31 penetrating through the support plate 3. The positive electrode tab 11 in the electrode group 1 close to the positive electrode cover plate 51 passes through the through hole 31 and is connected to the positive electrode cover plate 51, and the negative electrode tab 12 in the electrode group 1 close to the negative electrode cover plate 52 passes through the through hole 31 and is connected to the negative electrode cover plate 52. By providing the cooperation of the two support plates 3 and the fixing assembly 4, the connection stability between the multiple electrode groups 1 can be improved. When the electrode group 1 is inserted into the housing, the multiple electrode groups 1 can be pushed into the housing 8 by pushing the support plate 3, ensuring the balance of the thrust when the electrode group 1 is inserted into the housing. Optionally, the support plate 3 and the support plate 3 can be fixed to the electrode group 1 by means of bonding, hot melting, etc.

[0054] Preferably, the dimension a of the support plate 3 in the thickness direction L3 is greater than the distance b between the two support portions 421 of the support member 42, and the distance a between the two support portions 421 of the support member 42 is greater than 10 mm, that is, a > b > 10 mm.

[0055] The battery cell of the present application replaces one electrode group 1 with a larger length with multiple electrode groups 1 with smaller lengths. The length of a single electrode group 1 is smaller, reducing the risk of wrinkles, deformation, layer displacement, and fracture of the electrode group 1, thereby reducing the defective rate of the battery cell.

[0056] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery cell, characterized in that, The battery cell includes a housing, a first explosion-proof valve, a fixing assembly, and a plurality of electrode groups. Any one of the electrode groups includes a positive electrode tab and a negative electrode tab. The plurality of electrode groups are arranged along the length direction of the electrode groups. In two adjacent electrode groups, the positive electrode tab in one electrode group is connected to the negative electrode tab in the other electrode group. The fixing assembly is disposed between any two adjacent electrode groups. The fixing assembly includes a fixing main body and a support member. The fixing main body is attached to two adjacent electrode groups. The support member includes two support portions. The support portions protrude from an end portion of the fixing main body in the width direction of the electrode group. The two support portions are spaced apart along the thickness direction of the electrode group. The housing includes a first plate on one side in the width direction of the electrode group. The first plate is provided with a first mounting opening. The first explosion-proof valve is disposed on the first mounting opening. The first explosion-proof valve faces the fixing assembly. Both support portions are in contact with the inner sidewall of the housing. The two support portions are located on both sides of the first explosion-proof valve in the thickness direction.

2. The battery cell according to claim 1, characterized in that, The housing includes two first plates. Both first plates are provided with the first mounting openings. The battery cell includes two first explosion-proof valves. The two first explosion-proof valves are respectively disposed on the two first mounting openings. The number of the support members is two. The two support members are respectively fixed to both ends of the fixing main body in the width direction.

3. The battery cell according to claim 2, wherein, The fixing main body includes two fixing members. The fixing member includes a fitting plane and a receiving groove. The receiving groove is recessed from the fitting plane into the interior of the fixing member. The two fitting planes are attached to each other. The two receiving grooves define a receiving space. The positive electrode tab in one of two adjacent electrode groups and the negative electrode tab in the other electrode group extend into the receiving space.

4. The battery cell according to claim 3, wherein, The fixing member further includes a connecting plane and a connecting groove. The connecting plane and the fitting plane are respectively located on two opposite sides of the fixing main body in the thickness direction. The connecting groove is recessed from the connecting plane into the interior of the fixing member.

5. The battery cell according to claim 4, wherein Vent holes are formed on both sides of the fixing main body in the width direction. The vent holes communicate with the connecting groove. The vent holes face the first explosion-proof valve.

6. The battery cell according to claim 3, wherein, The difference between the distance between the two support portions in the support member and the dimension of the first explosion-proof valve in the thickness direction is greater than 1 mm.

7. The battery cell according to claim 3, wherein The dimension of the support portion in the width direction is greater than 0.5 mm and less than 1.5 mm.

8. The battery cell according to claim 6, wherein, The battery cell includes a positive electrode cover plate and a negative electrode cover plate. The negative electrode tab in the electrode group close to the negative electrode cover plate is connected to the negative electrode cover plate. The positive electrode tab in the electrode group close to the positive electrode cover plate is connected to the positive electrode cover plate.

9. The battery cell according to claim 8, wherein, The battery cell further includes two support plates, the two support plates are respectively connected to the electrode group close to the negative electrode cover plate and the electrode group close to the positive electrode cover plate, the support plate is provided with a through hole penetrating through the support plate, the positive electrode tab in the electrode group close to the positive electrode cover plate passes through the through hole and is connected to the positive electrode cover plate, and the negative electrode tab in the electrode group close to the negative electrode cover plate passes through the through hole and is connected to the negative electrode cover plate.

10. The battery cell according to claim 9, characterized in that, The size of the support plate in the thickness direction is greater than the distance between the two support portions in the support member, and the distance between the two support portions in the support member is greater than 10 mm.

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