6929results about "Vent arrangements" patented technology

A battery pack according to one or more embodiments of the present disclosure includes a plurality of battery cells; and a housing including a bottom member, a plurality of side walls, and a top member, the bottom member, the plurality of side walls, and the top member form an interior accommodation space configured to accommodate the plurality of battery cells, wherein at least one among the plurality side walls, the top member, and the bottom member are formed by a plurality of metal sheets that are roll bonded to each other, wherein at least one cooling channel is formed between bonding areas of the plurality of metal sheets, and wherein at least one crash channel is formed between bonding areas of the plurality of the metal sheets.

A battery pack including a housing and a cell frame supported within the housing. The cell frame includes a plurality of openings to secure a plurality of battery cells, and a weld strap disposed within the cell frame configured to interconnect the plurality of battery cells. The battery pack also includes a cell header cover disposed adjacent to the battery cells and covering the weld strap. The cell header cover is configured to prevent battery cell particulate from circulating within the outer housing. The cell header cover and the cell frame cooperate to surround the battery cells.

The utility model relates to a battery device and a power utilization device. The battery device comprises a box body, a plurality of battery monomers and a heat exchange assembly, the box body comprises at least two limiting beams arranged in the first direction. The plurality of battery monomers are arranged between the adjacent limiting beams along the first direction, each battery monomer comprises a shell, an electrode assembly, an electrode terminal and a pressure relief mechanism, the electrode assembly is accommodated in the shell, the shell comprises a first wall positioned on one side of the electrode assembly along the second direction, the pressure relief mechanism is arranged on the first wall, and the pressure relief mechanism and the electrode terminal are arranged at an interval; the electrode terminal is arranged on the first wall, and the first direction is perpendicular to the second direction; the heat exchange assembly is arranged on the side, away from the electrode assembly, of the first wall and used for exchanging heat with the first wall, the heat exchange assembly is connected to the limiting beam, and the orthographic projection of the pressure relief mechanism and the orthographic projection of the heat exchange assembly do not overlap. According to the battery device provided by the invention, the heat exchange assembly is connected to the limiting beam, so that the deformation of the limiting beam is limited, and the structural stability of the limiting beam is improved.

The utility model discloses a single battery and a battery pack with the single battery, the single battery comprises a shell, a pole group, an anti-explosion valve and a side plate, the shell defines a mounting space, and openings are arranged at two ends of the shell along the length direction of the single battery; the pole group is arranged in the mounting space, and the outer side of the pole group is coated with an insulating film; the anti-explosion valve is arranged in the mounting space and is positioned on one side of the shell along the width direction of the battery monomers, and an avoiding hole corresponding to the anti-explosion valve is formed in the shell; the side plate is arranged between the insulating film and the anti-explosion valve, a plurality of through holes are formed in the side plate, and the through holes penetrate through the side plate; wherein a concave part is arranged on the side wall of one end, far away from the side plate, of the shell along the width direction of the single battery, and the bottom wall, close to the side plate, of the concave part protrudes towards the side plate. According to the battery monomer disclosed by the utility model, the cracking risk of the battery monomer is relatively low, and the risk of heat spreading between adjacent battery monomers is relatively low.

Provided in the present application are an energy storage device and an energy storage system. The energy storage device comprises a first compartment and a battery device, wherein the first compartment comprises a first top wall and a first side wall connected to each other; the first top wall is provided with an exhaust mechanism, which can communicate the interior of the first compartment with the outside; and the first compartment accommodates the battery device. Since the first side wall mainly plays a role in supporting and load bearing in the first compartment, and the exhaust mechanism, which communicates the interior of the first compartment with the outside, is arranged on the first top wall instead of the first side wall, the impact of the arrangement of the exhaust mechanism on the structure of the first side wall is reduced, thereby reducing the impact of the arrangement of the exhaust mechanism on the supporting effect and load-bearing capacity of the wall of the first compartment, facilitating an improvement in the stress condition of the energy storage device and facilitating an improvement in the reliability of the energy storage device.

The invention relates to the technical field of batteries, and discloses a battery cell cover plate assembly, a battery cell and a battery pack. The battery cell cover plate assembly comprises a cover plate body and an anti-explosion valve. The cover plate body is provided with a pressure relief hole, and the pressure relief hole comprises a first hole section, a second hole section and a third hole section; the side wall of the first hole section protrudes out of the first surface to form a boss, the pressure relief hole further comprises a fourth hole section penetrating through the second surface, the fourth hole section is communicated with the third hole section, in the X direction, the inner diameter of the fourth hole section is smaller than the outer diameter of the side wall of the outer ring of the boss, and the cover plate body and the boss form a bent reinforcing structure. In the Z direction, the distance from the bottom wall of the fourth hole section to the first surface is a, in the X direction, the single-side distance from the side wall of the fourth hole section to the side wall of the outer ring of the boss is b, and a and b meet preset conditions. According to the invention, the problem of explosion-proof valve tearing caused by weak deformation resistance of the thin-wall cover plate can be solved, the risk of explosion-proof valve failure is reduced, liquid leakage of the battery cell is avoided, and the safety of the battery cell is improved.

A battery pack according to an embodiment of the present disclosure includes: a plurality of battery modules; a tray including a mount plate on which the plurality of battery modules are seated, a front frame provided on an end portion in a longitudinal direction of the mount plate, and a rear frame provided on the other end portion in the longitudinal direction of the mount plate; a pair of side covers covering both end portions in a width direction of the tray; at least one module partition wall parallel to the front frame and the rear frame, and located between adjacent battery modules; and a battery energy management system (BEM) assembly including a BEM bracket having one end portion fastened to the at least one module partition wall and the other end portion fastened to the rear frame, and a BEM mounted on the BEM bracket.

The utility model provides a battery and a power utilization device, and belongs to the technical field of batteries. The battery comprises a box body, a battery monomer group and a supporting piece, the box body comprises a bottom plate. The battery monomer group is accommodated in the box body, the battery monomer group comprises at least one battery monomer, the battery monomer comprises a shell, an electrode terminal and a pressure relief mechanism, the shell is provided with a wall part, the wall part and the bottom plate are arranged in the thickness direction of the bottom plate, and the electrode terminal and the pressure relief mechanism are arranged on the shell; at least one of the electrode terminal and the pressure relief mechanism is provided on the wall portion. The supporting piece is arranged between the wall part and the bottom plate and connected to the wall part. In the thickness direction of the base plate, the support has a first surface facing away from the wall portion, and the first surface is closer to the base plate than the electrode terminal and the pressure relief mechanism. The electrode terminal or the pressure relief mechanism of the single battery can be protected through the supporting piece, so that the risk that the single battery is impacted and damaged is reduced, the service life of the battery is prolonged, and the use reliability of the battery is improved.

According to the end cover assembly, the energy storage device and the electric equipment, the risk of short circuit of the energy storage device is reduced, and the safety performance of the energy storage device is improved. The end cover assembly comprises an end cover, an anti-explosion valve, a first pressing block, a lower insulating part and a first fixing part, the end cover comprises a first surface and a second surface which are arranged oppositely, the end cover is provided with an anti-explosion hole, and the anti-explosion hole penetrates through the first surface and the second surface; the anti-explosion valve is installed on the end cover and covers an opening, located in the second surface, of the anti-explosion hole. The first pressing block and the lower insulating part are both located on the side, away from the first surface, of the second surface, the first pressing block is located on one side of the explosion-proof hole and used for supporting the end cover and abutting against the battery cell assembly, and the melting point of the first pressing block is higher than that of the lower insulating part; the lower insulating part comprises a first sub-insulating part, the first sub-insulating part is located on the side, away from the explosion-proof hole, of the first pressing block, the first fixing part is arranged on the second surface and located on the side, away from the first sub-insulating part, of the first pressing block, and the first fixing part and the first sub-insulating part jointly clamp the first pressing block.

The invention relates to the technical field of lithium ion battery safety, and discloses a lithium ion battery thermal runaway multi-cascade emergency response prevention system. The system comprises a thermal signal monitoring module, a thermal diffusion prediction module, an emergency suppression module, a pressure balance module and a multi-mode linkage module. The thermal signal monitoring module obtains multi-dimensional temperature data, identifies abnormity and generates a thermal runaway early warning signal; the thermal diffusion prediction module combines the early warning signal and the battery module structure parameters to calculate the thermal propagation path and rate and generate a prediction result; the emergency suppression module matches a suppression medium according to a prediction result, and calculates a dose putting strategy to form a suppression scheme; the pressure balance module obtains pressure data, analyzes the change rate and distribution, adjusts a pressure release valve strategy in combination with a suppression scheme, and generates a pressure regulation and control instruction; and the multi-mode linkage module integrates data and a scheme, and generates a system-level emergency response instruction based on a pressure regulation and control instruction to realize thermal runaway multi-level joint prevention.

The present invention relates to an electric energy storage (10) for a motor vehicle. A plurality of battery module groups (14) each comprise a plurality of battery modules (20) each of a plurality of battery cells. A plurality of containers (12) are stacked and each comprise a substantially frame-shaped container outer wall (18), wherein one of the plurality of battery module groups (14) is arranged in each of the plurality of containers (12). A plurality of fastening elements (16), which are elongated, extend through the container outer walls (18) of the plurality of containers (12) and fasten the containers (12) to one another. The elongated fastening elements (16) passing through all the containers (12) are advantageous in that they enable a modular, freely scalable design of the electric energy storage (10) with a free geometric configuration, low weight and costs, as well as simple, quick assembly and disassembly.

The invention provides a detection device for internal pressure change of a battery cell, the battery cell comprises an explosion-proof valve or an explosion-proof sheet, and the explosion-proof valve or the explosion-proof sheet is arranged on a shell of the battery cell. When the internal pressure of the battery cell changes, the explosion-proof valve or the explosion-proof sheet deforms at first until the battery cell is broken due to overlarge internal pressure, and the detection device comprises an electrode sheet which is a multi-section type electrode sheet comprising a plurality of electrode sections, each electrode section is physically separated and is arranged above or on the side of the explosion-proof valve or the explosion-proof sheet, each electrode section and the explosion-proof valve or the explosion-proof sheet form an inductive capacitor, and deformation of different positions of the explosion-proof valve or the explosion-proof sheet is detected based on capacitance change; and the chip is a multi-channel chip, each channel is connected with each electrode section through a connecting line in a one-to-one correspondence manner, and the chip is also connected to an anti-explosion valve or an anti-explosion sheet through a connecting line. The invention also provides a battery core internal pressure early warning system.

The invention discloses a self-rescue device for new energy automobile battery thermal runaway, which comprises a battery monitoring unit, a mounting part and a battery module, a protection box is arranged on the outer side of the lower part of the battery module, the protection box is slidably arranged in a mounting groove formed in the bottom of an automobile, and a sealing mechanism, a support sensing plate and a power mechanism are arranged in the protection box; a self-rescue assembly is arranged in the sealing mechanism and comprises an air storage tank and an exhaust part. According to the self-rescue device for thermal runaway of the battery of the new energy automobile, after an abnormal battery module falls into the protection box, the sealing mechanism is unfolded to completely cover and wrap the battery module, the self-rescue assembly runs immediately, the gas storage tank sprays nitrogen to the battery module through the gas discharging opening in the telescopic gas discharging pipe, the battery module is protected in time, and the service life of the battery module is prolonged. According to the battery module provided by the invention, the situation that fire rapidly spreads is avoided under the condition that the battery module is isolated from the outside, so that normal and intact batteries are prevented from being influenced by abnormal batteries, the batteries which are not abnormal yet are effectively protected, and the practicability is better.

The utility model belongs to the technical field of batteries, and discloses a cover plate structure and a battery, the cover plate structure comprises a top cover plate and a support plate, the top cover plate is provided with an anti-explosion valve and a protruding part, and the protruding part and the anti-explosion valve are arranged at an interval; the supporting plate is connected with the protruding part so that an exhaust channel can be formed between the supporting plate and the top cover plate, a first exhaust hole and a second exhaust hole are formed in the supporting plate, and the first exhaust hole and the second exhaust hole are both communicated with the exhaust channel; the projection of the second exhaust hole in the first direction at least partially coincides with the projection of the anti-explosion valve in the first direction. Thus, the supporting plate is arranged on the protruding part, so that an exhaust channel is formed between the supporting plate and the top cover plate, high-temperature and high-pressure gas can enter the exhaust channel through the first exhaust hole and the second exhaust hole when the battery is in thermal runaway, and the exhaust effect of the anti-explosion valve is improved; the supporting plate can limit the end part of the pole group, so that the pole group is prevented from moving and shielding the anti-explosion valve, and the safety performance of the battery is improved.

A motor vehicle traction battery arrangement includes two cooling plates respectively disposed in a horizontal plane and a high-voltage battery module. The lower and upper horizontal walls of which are cooled directly by the cooling plates and which encases a plurality of identical rectangular battery cells in a rigid battery module housing. The battery cells are all configured such that they are plate-like and elongated, are parallel to one another in vertical planes (y,z) and each includes two small-area vertical end walls, two large-area vertical side walls and two medium-area horizontal walls. On its end face, each battery cell includes an anodic connecting element and a cathodic connecting element. At least two similar cell stacks including a same plurality of battery cells are provided, and are stacked such that their battery cell side walls adjoin one another. The battery cell horizontal walls directly adjoin a cooled battery module horizontal wall.

The invention belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell body and an explosion-proof valve, the shell body comprises a plurality of wall surfaces, any one of the plurality of wall surfaces is provided with a mounting boss provided with a mounting groove, the thickness size of the wall surface provided with the mounting boss is t1, and t2 is greater than t3; the thickness dimension of the wall face without the installation boss is t2, t1 > t2, the length dimension of the installation boss in the first direction is L1, the length dimension of the installation groove in the first direction is L2, (L1-L2) / 2 > = 1 mm, and the anti-explosion valve is arranged in the installation groove. The mounting boss is arranged as a reinforcing structure, and the thickness of the wall surface provided with the mounting boss is greater than that of other wall surfaces without the mounting boss, so that the structural strength of the wall surface for placing the explosion-proof valve is reinforced by using a dual structure, the dragging force to the explosion-proof valve when the shell body deforms is reduced, the failure risk is reduced, and the service life of the explosion-proof valve is prolonged. And the safety is improved.

A battery pack includes an elongated exhaust conduit defining a gas flow channel. The exhaust conduit includes a longitudinal center axis and a terminal end having a pack vent. The battery pack also includes fins disposed within the gas flow channel, and a plurality of battery cells arranged adjacent to the exhaust conduit. Each respective battery cell includes an outer casing defining a cell cavity. The casing defines a cell vent opening. An anode and a cathode are disposed within the cell cavity, and a vent cap covers the cell vent opening. The vent cap opens at a predetermined pressure to release hot gasses from the cell cavity into the gas flow channel. The fins direct the hot gasses along the longitudinal center axis and toward the terminal end of the exhaust conduit, and thus to the pack vent for discharge to the surrounding ambient environment.

An energy storage system includes an enclosure having a vent forming a flow path between an interior volume of the enclosure and an environment exterior to the enclosure. A vent covering is mounted proximate the vent and is selectively disposable over the vent such that the flow path is open when the vent covering is in an open position and closed when the vent covering is in a closed position. The vent covering can be biased to the open position and / or made of a thermally decomposable material. An actuator is coupled to the vent covering such that supply of power to the actuator causes the vent covering to assume the closed position and loss of power to the actuator causes the vent covering to assume the open position. A method comprises detecting a flammable gas and opening a first flow path by a first vent of the enclosure.

The embodiment of the invention provides a battery and an electric device. The battery comprises a box body and a battery monomer, the box body comprises a first box wall. The single battery is contained in the box body and located on the lower side of the first box wall, the single battery comprises a shell, an electrode assembly and a pressure relief mechanism, the shell is fixed to the first box wall, the electrode assembly is contained in the shell, the shell comprises a first end wall, the first end wall is located on the side, away from the first box wall, of the electrode assembly, and the pressure relief mechanism is arranged on the first end wall. And under the condition of room temperature, the charging time of charging the battery monomer from 10% SOC to 80% SOC is 5-10.5 minutes.

The invention relates to the technical field of batteries, in particular to a battery cell cover plate assembly and a battery cell, the battery cell cover plate assembly comprises a cover plate, a cover plate insulation protection sheet, an anti-explosion valve and an anti-explosion valve insulation protection sheet, along a first preset direction, a mounting through hole penetrating through a first side and a second side of the cover plate is formed in the cover plate, and the anti-explosion valve is mounted in the mounting through hole; the explosion-proof valve insulation protection sheet is arranged on the second side of the cover plate and is used for covering the mounting through hole; the cover plate insulation protection piece is arranged on the second side of the cover plate, an anti-explosion valve avoiding hole for avoiding the anti-explosion valve is formed in the cover plate insulation protection piece, and the cover plate insulation protection piece and the anti-explosion valve insulation protection piece are partially overlapped together. Therefore, the cover plate insulation protection sheet and the explosion-proof valve insulation protection sheet are overlapped by a certain adhesion area, so that the adhesion area of the cover plate insulation protection sheet and the explosion-proof valve insulation protection sheet is increased to the greatest extent in a limited space, and the risk that the cover plate insulation protection sheet and the explosion-proof valve insulation protection sheet fall off is greatly reduced.

The embodiment of the utility model provides a single battery and a battery pack. The single battery comprises a battery cell, a shell, an anti-explosion valve and a filtering structure, the battery cell is arranged in the shell; the shell is provided with a mounting hole, and the anti-explosion valve is arranged in the mounting hole; the filtering structure is arranged outside the shell and at least covers the anti-explosion valve, the filtering structure comprises at least two layers of filter screens, and the filter screens are used for intercepting particulate matter in the flue gas. By arranging the filtering structure, particulate matters discharged during pressure relief of the anti-explosion valve can be effectively intercepted, so that the particulate matters are prevented from being splashed to other single batteries without thermal runaway to cause thermal runaway, and the use safety of the single batteries is favorably improved.

The invention discloses a single battery and a battery pack, and belongs to the technical field of batteries, and the single battery comprises a shell, an electrode assembly, a cover plate and an anti-explosion valve. According to the embodiment of the invention, the reasonable area S of the explosion-proof valve is obtained by measuring the maximum sizes L, T and H of the shell in three directions, the thicknesses I, M and J of the first wall, the second wall and the third wall of the shell and the maximum size a of the cover plate in the third direction, and the area S of the explosion-proof valve does not need to be calculated through complex parameters such as surface density, gram volume and active matter mass; errors caused by complex measurement and calculation are avoided, and the calculation method is simplified. The size of the anti-explosion valve is reasonably designed, so that the anti-explosion valve can be normally opened for exhausting when the single battery is in thermal runaway, and the safety and the reliability of the single battery are further improved.

The invention provides a collector plate, a battery and electric equipment. The flow collecting disc comprises a flow collecting disc body and a turnover piece, a through hole is formed in the flow collecting disc body, the turnover piece is arranged at the through hole, the turnover piece comprises a flow collecting part and a connecting part, the connecting part is connected with the flow collecting part and the flow collecting disc body, the partial thickness of the connecting part is smaller than the thickness of other parts of the connecting part, and / or the turnover piece is arranged on the flow collecting disc body. The thickness of at least part of the connecting part is smaller than that of the collector plate body, and / or the thickness of at least part of the connecting part is smaller than that of the collector part. According to the collector plate, the turnover piece is easier to turn over, the turnover angle of the turnover piece is guaranteed, and the unfolding effect of the collector plate is improved.

Battery for an electric vehicle, comprising a battery housing (12) which defines an interior space (14), at least one battery cell (16, 18) which is arranged in the interior space (14), and a degassing device (20) which has a battery cell degassing device (22) arranged on the at least one battery cell (16, 18) and a housing degassing device (24) arranged on the battery housing (12), wherein the degassing device (20) is configured to discharge gases from the battery cell (16, 18) and the battery housing (12) via the battery cell degassing device (22) and the housing degassing device (24), wherein the housing degassing device (24) has a gas discharge channel unit (26) which is attached to the battery housing (12), at least partially in a housing through-opening (28) which extends from an outside of the battery housing (12) to an inside of the battery housing. (12) extends,is arranged and is fluid-tight against the battery cell (16, 18).

A battery pack assembly includes a frame, a composite cold plate and at least one battery cell. The frame includes a tray and exhaust channels communicated with the outside and arranged on two opposite sides of the tray. The composite cold plate is arranged on the tray. The composite cold plate includes a flow passage plate, and a concave rib-convex rib structure is formed on the surface of the flow passage plate. A concave rib is arranged between every two adjacent convex ribs. Cold plate flow passages are defined by concave ribs and the tray, and are communicated with the exhaust channels. The battery cell is arranged on the composite cold plate. Poles of the battery cell face the composite cold plate. A first explosion-proof valve is provided on the side of the battery cell facing the composite cold plate, and is communicated with the cold plate flow passages.

To provide a lead with an insulating resin film with which, when applied to a battery, it is possible to eject a gas generated in a region sealed by the outer packaging of the battery to the outside of the region sealed by the outer packaging.SOLUTION: Provided is a lead with an insulating resin film comprising a conductor and an insulating resin film, wherein, when an axis extending along two sides facing each other is defined as an axis X and an axis crossing the axis X is defined as an axis Y with the conductor viewed from above, the insulating resin film is disposed so as to cover the conductor crossing it along the axis X and not to cover both ends of the conductor that are along the axis Y so as to extend off both ends of the conductor and overlap. The insulating resin film has a first layer being in contact with the conductor, and a second layer. The second layer includes a base resin composed primarily of polypropylene, and one or more kinds of additive component selected from a rubber component and an elastomer component. The melting point of the base resin is 110°C to 130°C inclusive, and the softening point of the additive component is 130°C or below. The second layer contains 10 mass% to 40 mass% inclusive of the additive component.SELECTED DRAWING: Figure 3A

The invention relates to the technical field of batteries, and particularly discloses an anti-explosion valve mounting structure and a battery, and the anti-explosion valve mounting structure comprises an anti-explosion valve and a mounting plate. A mounting hole is formed in the mounting plate, the anti-explosion valve comprises a body part, a fixing part and a skirt edge, and the skirt edge is arranged in the circumferential direction of the fixing part in a surrounding mode. A seam is formed between the peripheral wall of the side, away from the body part, of the fixing part and the hole wall of the mounting hole in the direction from the fixing part to the skirt edge. In the axial direction of the mounting hole, the skirt edge is in lap joint with the end face of the mounting plate in the circumferential direction of the mounting hole, the projection of the skirt edge on the mounting plate can cover the seam, and the fixing part and / or the skirt edge are / is welded to the mounting plate. The thickness of the welding position of the anti-explosion valve and the mounting plate is increased through the arrangement of the skirt edge, the welding yield of the mounting plate and the anti-explosion valve is high, and the connection strength is high. And meanwhile, the skirt edge also provides support for the connecting position of the mounting plate and the anti-explosion valve, so that the structural strength is relatively high. The invention also provides a battery which is assembled by adopting the explosion-proof valve mounting structure.

The invention discloses a secondary battery and electric equipment, the secondary battery comprises a shell and an electrode assembly, the electrode assembly is accommodated in the shell, the shell comprises a shell body and a shell cover, and the shell cover comprises a first edge and a second edge adjacent to the first edge. The shell cover is provided with a groove at least comprising a first groove section and a second groove section, and the first groove section and the second groove section are in a curve shape when observed in the thickness direction of the shell cover. The first groove section comprises a first end connected with the second groove section and a second end serving as the tail end of the groove, the first groove section extends in the direction away from the second edge, and the first groove section is parallel to the first edge or gradually away from the first edge in the extending direction from the first end to the second end. And when the internal pressure of the secondary battery is too high, the groove can be broken for pressure relief and air exhaust, so that the risk that the secondary battery catches fire and explodes is reduced. And the first groove section can guide cracks of the groove, so that the possibility that the shell cover is exploded along with the groove is reduced, and the safety of the secondary battery is improved.

The utility model discloses a shell, cell and battery pack, the shell comprises: a shell assembly, the shell assembly comprises a shell body and cover plates, the two ends of the shell body in the length direction are both provided with the cover plates and connected, and the shell body is provided with an explosion-proof valve; and the insulating assembly comprises a first insulating film and a second insulating film, the first insulating film wraps the peripheral wall of the shell body, a first avoiding hole is formed in the first insulating film, the second insulating film is located in the first avoiding hole, and a second avoiding hole for avoiding the explosion-proof valve is formed in the second insulating film. According to the shell disclosed by the utility model, gas-electricity separation of the battery cell can be realized, a good insulation effect is ensured, and the explosion-proof valve is reliably opened.

This power storage device comprising a power storage element includes: a case that houses the power storage element and is provided with a through hole; and a connection part that is arranged in the case and connects two members inside the case. The power storage device is configured to enable ventilation between the inside and the outside of the case via the through hole. At least a portion of the connection part is arranged in the through hole when viewed from the penetration direction of the through hole.