DE202023101289U1 - Energy storage device and power consuming device - Google Patents

Abstract

Energy storage device (100), characterized in that it comprises:
an end cap component (30) comprising an end cap (31) and an electrode terminal (32), wherein an electrode lead-out hole (311) is formed on the end cap (31), and the electrode terminal (32) has the lead-out hole (311) of the electrode covers;
a connecting member (40), a projection (441a) being provided on one surface of said connecting member (40) and a recess (441b) being formed on the other surface, and said projection (441a) being connected to an end of said electrode terminal ( 32) is electrically connected; and
a filler (50) filled in the recess (441b), wherein along the axial direction of the lead-out hole of the electrode, the ratio of the projected area of the filler (50) to the projected area of the recess (441b) is greater than or equal to 1.1 and smaller or equal to 1.5, and wherein under the condition of a complete charge and discharge cycle in an environment with a current of 1 C and a temperature of 25 ° C, the number of cycles that the energy storage device (100) is subjected to when the discharge capacity of the energy storage device (100) drops to 80% of the rated capacity is greater than or equal to 2000 and the number of cycles to which the energy storage device (100) is subjected when the discharge capacity of the energy storage device (100) drops to 90% of the rated capacity is greater than or is equal to 1000.

Description

TECHNICAL AREA

The present application relates to the technical field of new energy battery, particularly an energy storage device and a power consuming device.

STATE OF THE ART

The energy storage device includes a case, an electrode component received in the case, and an end cap component. The end cap component includes an end cap and an electrode terminal, the end cap being connected to the housing, and the electrode terminal being disposed on the end cap. The electrode component is the core component of the energy storage device for charging and discharging, and the electrode terminal protrudes from the end cover and is used for electrical connection with external devices. In order to realize the charging and discharging of the electrode component, the electrode component and the electrode terminal are usually connected by a connecting member, which is usually welded to the electrode terminal, and the welding slag generated when welding the connecting member and the electrode terminal easily falls on the Electrode component, which affects the life of the energy storage device.

CONTENTS OF THIS APPLICATION

The present application provides an energy storage device and a power consuming device whose lifespan can be extended.

In a first aspect, the present application provides an energy storage device. The energy storage device includes an end cap component, a connector, and a filler. The end cap component includes an end cap and an electrode terminal, wherein an electrode lead-out hole is formed on the end cap, and the electrode terminal covers the electrode lead-out hole. A protrusion is disposed on one surface of the connecting member, a recess is formed on the other surface, and the protrusion is electrically connected to an end of the electrode terminal. The filler is filled in the recess, wherein along the axial direction of the lead-out hole of the electrode, the ratio of the projected area of the filler to the projected area of the recess is greater than or equal to 1.1 and less than or equal to 1.5, and wherein under the condition of complete Charge and discharge cycle in an environment with a current of 1 C and a temperature of 25°C the number of cycles to which the energy storage device is subjected when the discharge capacity of the energy storage device drops to 80% of the rated capacity is greater than or equal to 2000 and the Number of cycles that the energy storage device undergoes when the discharge capacity of the energy storage device drops to 90% of the rated capacity is greater than or equal to 1000.

In the energy storage device of the present application, a projection is formed on a surface of the connecting member facing the end cap, which is electrically connected to an end of the electrode terminal, for example, electrical connection is realized by welding, so that the height of the electrode terminal can be set smaller to to save the costs. The other surface of the connecting member facing away from the protrusion is provided with a recess opposite to the protrusion, the protrusion being welded to the electrode terminal by laser welding, and the protrusion from the side where the recess is located to the electrode terminal by laser is welded, and the welding slag or burrs generated by welding remain on the top wall of the recess, and a sticky filler member is fixed in the recess, the filler member is fully filled into the recess and abuts against the side wall of the recess, so that the Welding slag generated by welding the projection and the electrode terminal can be sealed and accumulate on the filling member in the recess. Along the axial direction of the lead-out hole of the electrode, the ratio of the projected area of the filler to the projected area of the recess is greater than or equal to 1.1, so that the filler can completely seal the peripheral edge of the recess to prevent the welding slag from spreading due to vibration or long-term corrosion or scouring of the electrolyte, thereby effectively preventing short-circuiting of the electrode component due to the slag peeling and improving the safety performance of the energy storage device. In addition, is along the axial direction of the lead-out hole of the electrode, the ratio of the projected area of the filling member to the projected area of the recess is greater than or equal to 1.1 and less than or equal to 1.5, under the condition of a complete charge and discharge cycle in a current environment of 1 C and a temperature of 25 ° C, the filling member can seal the burrs or welding slag generated when welding the electrode terminal and the projection, to avoid peeling off during the movement of the energy storage device or due to long-term corrosion or scouring of the electrolyte, thereby the number of cycles that the energy storage device is subjected to when the discharge capacity of the energy storage device drops to 80% of the rated capacity may be greater than or equal to 2000 and the number of cycles that the energy storage device is subjected to when the discharge capacity of the energy storage device drops to 90% , is greater than or equal to 1000, thus the cycle number of the power storage device can be effectively improved. If, in the axial direction of the lead-out hole of the electrode, the ratio of the projected area of the filler to the projected area of the recess is less than 1.1, the peripheral edge of the recess sealing part of the filler has too small an area, which can easily lead to the filler member detaches from the peripheral edge of the recess, causing the welding slag to fall onto the electrode component from the gap between the side wall of the recess and the filler member in the recess due to shock or long-term corrosion or scouring of the electrolyte, which affects the safety performance of the electrode component and thus leads to that the number of cycles to which the energy storage device is subjected when the discharge capacity of the energy storage device drops to 80% of the rated capacity is less than 2000 and the number of cycles to which the energy storage device is subjected when the discharge capacity of the energy storage device to 90% of the Rated capacity drops, is less than 1000. When the ratio of the projected area of the filler to the projected area of the recess is greater than 1.5, the part of the filler sealing the peripheral edge of the recess has too large an area, since the filler has no fixed flow direction, the filler can easily enter the welding part of the Eyelet overflow, affecting the performance of the energy storage device, thereby affecting the life of the energy storage device. In an energy storage device having a ratio of the projected area of the filler to the projected area of the recess greater than 1.5 and an energy storage device having a ratio of the projected area of the filler to the projected area of the recess of 1.5, the relationship curves between the number of cycles and the capacity maintenance rate of the former and the relation curve between the number of cycles and the capacity maintenance rate of the latter almost with each other. The ratio of the projected area of the filling member to the projected area of the recess larger than 1.5 is not more advantageous for the electric performance of the energy storage device, but increases the production cost and reduces the volume utilization of the energy storage device.

In a possible embodiment, a penetration hole is formed on a side of the protrusion connected to the electrode terminal.

It can be seen that a penetrating hole is formed on a side of the protrusion connected to the electrode terminal, so that when the protrusion is welded to the electrode terminal, welding can be performed through the penetrating hole, thereby facilitating the welding of the protrusion to the electrode terminal , and the recess is filled with the filler, so that the burrs or welding slag generated during welding are sealed and can accumulate on the filler. It is understood that it is possible that a penetrating hole is not formed on a side of the projection connected to the electrode terminal, so that the burrs or welding slag generated when welding the projection and the electrode terminal do not easily fall on the electrode component, in order to improve the safety performance of the electrode component to ensure.

In one possible embodiment, the filling member includes a main body portion and a first flange portion, wherein the first flange portion protrudes from an outer peripheral surface far from the main body portion along the radial direction of the lead-out hole of the electrode, and wherein the main body portion is provided in the recess and at least partially in the recess is exposed, and wherein the first flange portion is connected to the portion of the main body portion exposed in the recess, and wherein the main body portion abuts against the side wall of the recess, and wherein the first flange portion covers and abuts the peripheral edge of the recess.

It can be seen that the main body portion of the filler element is filled in the recess and is at least partially exposed in the recess, with the main body received in the recess cut abuts against the side wall of the recess, and the test shows that the welding slag generated when welding the projection and the electrode terminal is avoided from falling off, and the first flange portion protrudes from the outer peripheral surface of the part of the main body portion exposed in the recess along the radial toward the lead-out hole of the electrode so that the first flange portion covers and abuts the peripheral edge of the recess to completely seal the recess, which further prevents the weld slag from the open side of the recess due to shock or long-term corrosion or scouring of the electrolyte fall on the electrode component to ensure the safety of the electrode component, whereby the number of cycles to which the energy storage device is subjected when the discharge capacity of the energy storage device falls to 80% of the rated capacity is greater than or equal to 2000 and the number of cycles to which the Energy storage device is subjected to when the discharge capacity of the energy storage device drops to 90%, is greater than or equal to 1000 to effectively increase the number of cycles of the energy storage device, since the ratio of the projected area of the filling member to the projected area of the recess of the connecting member is set to 1.1- 1.5 is limited, it is avoided that the occupation of the space of the connecting member reduces the remaining space inside the energy storage device, which in turn leads to an increase in the pressure of the energy storage device after the circulating gas generation inside, and thus the safety and durability of the energy storage device improved.

In a possible embodiment, the first flange portion has a thickness of (0.1mm, 4.0mm] along the axial direction of the lead-out hole of the electrode.

It can be seen that when the first flange portion has a thickness of less than 0.1 mm, the first flange portion is prone to being worn by other components due to too small a thickness and peeling off from the peripheral edge of the recess. If the first flange portion has a thickness greater than 4.0 mm, the first flange portion has too large a thickness and weight, so that when the energy storage device is moved or the electrolyte scours for a long time, the filling member easily detaches from the peripheral edge of the recess replaces. In the present application, the thickness of the first flange portion is set to (0.1mm, 4.0mm] in order to improve the bonding strength between the first flange portion and the peripheral edge of the recess, which reduces the risk of the filler member peeling off from the recess. It It should be understood that a thickness by which a part of the main body portion exposed in the recess extends along the axial direction of the lead-out hole of the electrode may be the same as a thickness of the first flange portion along the axial direction of the lead-out hole of the electrode, so that one of side surface of the main body portion far from the electrode terminal is flush with a side surface of the first flange portion far from the electrode terminal.

In one possible embodiment, the connecting element comprises a first section, a second section and a third section, the second section being connected between the first section and the third section, and the first section and the third section being connected at two opposite ends of the second Section are arranged, and wherein the first section and the third section are each located on a first side of the second section, and wherein the recess is located at the second section, and along the axial direction of the lead-out hole of the electrode, the projected area of the filling member is smaller than is the projected area of the second section.

It can be seen that the first section and the third section of the connecting element are arranged on a first side of the second section and the second section is connected between the first section and the third section so that the connecting element as a whole has a U-shaped structure , and the first section and the third section can each be connected to the eyelets on an electrode component and the recess is arranged on the second section, so that two electrode components are connected to the electrode terminal by a connecting element to increase the energy density of the energy storage device and at the same time the arrangement of the connecting element is saved. Further, along the axial direction of the lead-out hole of the electrode, the projected area of the filler is smaller than the projected area of the second portion to avoid over-adhering the filler from interfering with the connection of the connector to the other components of the energy storage device. By ensuring that the filler seals the recess, the area of the filler covering the second portion is reduced to reduce the use of the filler and save the cost effectively.

In a possible embodiment, the difference between the diameter of the filling member and the diameter of the recess along the radial direction of the lead-out hole of the electrode is [0.2mm, 10.0mm],

It can be seen that when the difference between the diameter of the filler and the diameter of the recess is less than 0.2mm and the ratio of the projected area of the filler to the projected area of the recess is less than 1.1, the ratio with the peripheral edge of the recess connected part of the filling member has too small an area, so that with the movement of the energy storage device or the long-term scouring of the electrolyte, the filling member is easy to peel off from the peripheral edge of the recess, which may cause the welding slag due to shock or corrosion or scouring of the Electrolyte falls onto the electrode component from the gap between the side wall of the recess and the filling member in the recess, and thus the safety performance of the electrode component is impaired. When the difference between the diameter of the filler and the diameter of the recess is larger than 10.0 mm, the area of the second portion is set too large, and the laying area of the filler is also set larger, resulting in high production cost. Since the filling element does not have a fixed flow direction, the filling element is easy to overflow into the welding part of the eyelet, which affects the performance of the energy storage device, thereby affecting the life of the energy storage device. Along the radial direction of the lead-out hole of the electrode, the difference between the diameter of the filler and the diameter of the recess is [0.2mm, 10.0mm]. For cost saving, it is ensured that the ratio of the projected area of the filler to the projected area of the recess is greater than or equal to 1.1 and less than or equal to 1.5, so that the filler can completely seal the peripheral edge of the recess to avoid the welding slags peel off due to shock or long-term corrosion or scouring of the electrolyte, thereby effectively preventing the electrode component from short-circuiting due to the slag peeling-off and improving the safety performance of the energy storage device. In addition, the filling member can seal and accumulate the burrs generated when welding the electrode terminal and the projection to avoid them from peeling off during the movement of the energy storage device or due to long-term corrosion or scouring of the electrolyte, so that under the condition of full charging and discharge cycle in an environment with a current of 1 C and a temperature of 25°C:the number of cycles to which the energy storage device is subjected when the discharge capacity of the energy storage device falls to 80% of the rated capacity is greater than or equal to 2000 and the number of cycles that the power storage device undergoes when the discharge capacity of the power storage device drops to 90% of the rated capacity is greater than or equal to 1000, which can effectively improve the number of cycles of the power storage device.

In one possible embodiment, the second section comprises an oppositely arranged first end and second end, the first section being connected to the first end and the third section being connected to the second end; and wherein a notch is formed on a side of the first end far from the first portion or a side of the second end far from the third portion, and wherein when the first end and the second end are respectively provided with the notch, along In the axial direction of the lead-out hole of the electrode, the notch of the first end and the notch of the second end have different projection shapes.

It will be appreciated that the notch may be located on a side of the first end remote from the first portion, or the notch may be located on a side of the second end remote from the third portion, or the notches may be provided in a number of 2 wherein one notch is located on a side of the first end remote from the first portion and the other notch is located on a side of the second end remote from the third portion; if the first end and the second end are each provided with a notch, the notch of the first end and the notch of the second end have different shapes, e.g. the notch formed at the first end is a sharp-edged notch and the notch formed at the second end is a rounded one Notch, so that the first end and the second end of the second section form an asymmetric structure, and when installing the connector, it can be determined by the notch whether the front side and the rear side of the connector are installed reversely, and by the notch It can detect whether the positive and negative connectors are installed in the wrong position to achieve poka-yoke function.

In one possible embodiment, a second side of the second portion includes a protruding portion, the second side being opposite the first side, and the protruding Section is connected between the first end and the second end, and wherein at least a part of the projection is on the protruding portion.

It can be seen that when installing the connector, the connector can be positioned on the end cap component by the protruding portion located on the second portion to prevent the connector on the end cap component from wobbling, which ensures that the protrusion on the connector on the lead-out hole of the electrode can be aligned, thus ensuring the accuracy of the connection between the projection and the electrode terminal. Further, at least a part of the protrusion is in the place of the protruding portion, and the distance from the first side of the second portion to the second side can be set relatively small to save the cost; and compared to the second section, the protruding section is further away from the first section and the third section, to effectively avoid the filling member from overflowing to the first section and the third section when injection molding the filler, which improves the stability of the connection between the first section and the eyelet and stability of the connection between the third section and the eyelet, thus ensuring the performance and lifespan of the energy storage device.

In a possible embodiment, the connecting element comprises a first surface and a second surface, which are arranged opposite to each other along the axial direction of the lead-out hole of the electrode, wherein compared to the second surface, the first surface is further away from the electrode terminal, and wherein the first surface is recessed to form the recess, and at a position of the second surface corresponding to the recess, the protrusion is formed, and wherein the connecting member further forms a welding position located at the second surface.

It can be seen that the second surface close to the electrode terminal is provided with a protrusion, the top surface of the protrusion protrudes from the second surface, and the protrusion is electrically connected to the electrode terminal so that the height of the electrode terminal is relatively small can be arranged to save the cost. At this time, the connecting member that does not form a recess and a projection may be punched from the first surface to the second surface, so that the connecting member forms a recess and a projection that correspond to each other. A welding position is arranged on a second surface of the connecting member close to the electrode terminal, when the connecting member is welded to the eyelet on the electrode component, the welding can be performed by changing the welding position on the second surface to a position corresponding to the eyelet on the connecting member aligned, thereby preventing wrong welding when welding the connector with the eyelet on the electrode component, to ensure the welding strength between the connector and the eyelet and the overflow capacity of the connector.

In a possible embodiment, the welding position is provided on the first section and the third section.

It will be appreciated that when the energy storage device comprises dual electrode components, the first section may be connected to the eyelet on one electrode component and the third section may be connected to the eyelet on another electrode component, and when welded, respectively, by the welding position on the first section and the welding position on third section the respective corresponding eyelet is positioned in order to ensure the accuracy of the connection between the eyelet and the connecting element. Further, the welding position at the first section and third section is provided to avoid the filling member at the second section from overflowing to the welding position and thus affecting the accuracy of the connection between the connecting member and the eyelet, which ensures the performance of the energy storage device. Further, the connection between two electrode components and the electrode terminal is realized using a connector by connecting the projection on the second portion to the electrode terminal to reduce the number of connectors arranged and save the cost.

In one possible embodiment, the welding position includes a plurality of first concave portions, wherein the first concave portion is formed to be recessed from the second surface toward the first surface, and the depth by which the first concave portion is recessed is smaller than the thickness of the connecting member, and the ratio of the depth by which the first concave portion is recessed to the thickness of the connecting member is in the range of [0.06, 0.19].

It can be seen that a plurality of concave portions are formed at the welding position, the first concave portion being formed to be recessed from the second surface toward the first surface, when welding the fastener with the eyelet, the concave at the first Section located part (namely, the bottom wall of the first concave portion) of the connector can be welded with the eyelet, and the weld slag generated during welding can be concentrated in the first concave portion to prevent the weld slag from falling into the electrode component. Further, the depth by which the first concave portion is depressed is smaller than the thickness of the fastener, and by controlling the depth by which the first concave portion is depressed, the welding thickness of welding the fastener with the eyelet can be determined. Compared with welding, the welding thickness is determined manually, the welding step becomes simpler, and it is easier to ensure that the thickness of the bottom wall of the first concave portion meets the welding strength requirement to achieve the welding effect of welding the fastener with the to ensure eyelet. For example, the ratio between the depth by which the first concave portion is depressed and the thickness of the connecting member is in the range of [0.06, 0.19]. If the ratio between the depth by which the first concave portion is depressed and the thickness of the connecting member is less than 0.06, with a fixed thickness of the connecting member, the thickness of the bottom wall of the first concave portion becomes too small, affecting the strength of welding the bottom wall of the first concave portion with the eyelet is reduced, and cracking easily occurs with long-term use, which deteriorates the overrun capacity of the connector. If the ratio between the depth by which the first concave portion is depressed and the thickness of the connecting member is greater than 0.19, with a fixed thickness of the connecting member, the thickness of the bottom wall of the first concave portion becomes too large, causing the difficulty of welding increased. The ratio between the depth by which the first concave portion is depressed and the thickness of the connecting member is in the range of [0.06, 0.19], so that the thickness of the bottom wall of the first concave portion is in the appropriate range , to meet the welding strength requirement of welding the connector with the eyelet, which effectively avoids the occurrence of cracking at the joint between the connector and the eyelet, thus affecting the overflow capacity of the connector, thereby making it under the condition of a complete Charge and discharge cycle in an environment with a current of 1 C and a temperature of 25 ° C ensures that when the ratio of the projected area of the filling element to the projected area of \u200b\u200bthe recess is greater than or equal to 1.1 and less than or equal to 1.5 the number of cycles the energy storage device undergoes when the discharge capacity of the energy storage device drops to 80% of the rated capacity is greater than or equal to 2000 and the number of cycles the energy storage device undergoes when the discharge capacity of the energy storage device drops to 90% of the rated capacity is greater than or equal to 1000.

In a possible embodiment, the end cap component further comprises a first insulating member and a sealing member, wherein the first insulating member forms a bore, and wherein the first insulating member is connected to the end cap, and wherein the bore corresponds to the lead-out hole of the electrode, and wherein along the axial direction of the lead-out hole of the electrode, the protrusion penetrates the bore and the lead-out hole of the electrode in succession, and the side wall of the protrusion abuts against the side wall of the bore, and the sealing member is fitted on a side of the lead-out hole of the electrode far from the first insulating member, and wherein the electrode terminal is abutted against the sealing member.

It can be seen that a first insulating member is interposed between the end cap and the connecting member to insulate and protect the end cap and the connecting member, a hole is provided at a position of the first insulating member corresponding to the lead-out hole of the electrode, and the protrusion of the Connecting element successively penetrates the bore and the lead-out hole of the electrode and is located in the lead-out hole of the electrode, the side wall of the projection abuts the side wall of the bore, so that the height of the electrode terminal set along the axial direction of the electrode lead-out hole can be set smaller , to save the cost; further, a sealing member is fitted on a far side of the electrode lead-out hole from the first insulator, the sealing member being fitted on a side of the electrode lead-out hole far from the first insulator and abutted against the electrode terminal to form the end cap and the electrode terminal to insulate and protect, thereby avoiding that a short circuit occurs between the end cap and the electrode terminal and thus affecting the number of cycles of the energy storage device.

In one possible embodiment, the sealing member includes a restricting portion and a convex portion, wherein the restricting portion extends from an end far from the connecting member of the outer peripheral surface of the convex portion along the radial direction of the lead-out hole of the electrode, and the end cap along the peripheral edge of the lead-out hole of the electrode forms a fitting portion, and the restricting portion fits with the fitting portion, and the electrode terminal abuts against the restricting portion, and the convex portion protrudes into the lead-out hole of the electrode, and the convex portion abuts against the side wall of the recess.

It can be seen that the restricting portion of the sealing member extends from an end far from the connecting member of the outer peripheral surface of the convex portion along the radial direction of the lead-out hole of the electrode and at the peripheral edge of a far from the connecting member side of the end cover in the lead-out hole of the electrode surrounding fitting portion is formed, and wherein the electrode terminal is abutted against the restricting portion so that the electrode terminal is insulatingly connected to the end cap to avoid the electrode terminal coming into direct contact with the end cap and short-circuiting. Further, the convex portion protrudes into the lead-out hole of the electrode, and the convex portion abuts against the side wall of the recess to prevent the connection member insulating with the end cap, which avoids the occurrence of a short circuit.

In a second aspect, the present application provides a power consuming device. The power consuming device includes an energy storage device in any embodiment of the present application.

In the energy storage device of the present application, a protrusion electrically connected to an end of the electrode terminal by, for example, welding is formed on a surface of the connector facing the end cap, so that the height of the electrode terminal can be set smaller to save the cost. The other surface of the connecting member facing away from the protrusion is provided with a recess opposite to the protrusion, the protrusion being welded to the electrode terminal by laser welding, and the protrusion from the side where the recess is located to the electrode terminal by laser is welded, and the welding slag or burrs generated by welding remain on the top wall of the recess, and a sticky filler member is fixed in the recess, the filler member is fully filled into the recess and abuts against the side wall of the recess, so that the Welding slag generated by welding the projection and the electrode terminal can be sealed and accumulate on the filling member in the recess. Further, along the axial direction of the lead-out hole of the electrode, the ratio of the projected area of the filler to the projected area of the recess is greater than or equal to 1.1, so that the filler can completely seal the peripheral edge of the recess to prevent the welding slag from spreading due to Shock or long-term corrosion or scouring of the electrolyte, effectively preventing short-circuiting of the electrode component due to slag detachment, and improving the safety performance of the energy storage device. In addition, along the axial direction of the lead-out hole of the electrode, the ratio of the projected area of the filler to the projected area of the recess is greater than or equal to 1.1 and less than or equal to 1.5, under the condition of a complete charge and discharge cycle in an environment with a current of 1C and a temperature of 25°C, the filling member can seal the burrs or welding slag generated when welding the electrode terminal and the projection, to avoid them from spreading during the movement of the energy storage device or due to long-term corrosion or scouring of the electrolyte detach, whereby the number of cycles to which the energy storage device is subjected when the discharge capacity of the energy storage device drops to 80% of the rated capacity is greater than or equal to 2000 and the number of cycles to which the energy storage device is subjected when the discharge capacity of the energy storage device to 90 % drops is greater than or equal to 1000, thus the cycle number of the power storage device can be effectively improved. If, in the axial direction of the lead-out hole of the electrode, the ratio of the projected area of the filler to the projected area of the recess is less than 1.1, the peripheral edge of the recess sealing part of the filler has too small an area, which can easily lead to the filler member detaches from the peripheral edge of the recess, causing the welding slag to fall onto the electrode component from the gap between the side wall of the recess and the filler member in the recess due to shock or long-term corrosion or scouring of the electrolyte, which affects the safety performance of the electrode component and thus leads to that the number of cycles that the energy storage device is subjected to when the discharge capacity of the energy storage device drops to 80% of the rated capacity is less than 2000 and the number of cycles to which the energy storage device is subjected when the discharge capacity of the energy storage device drops to 90% of the rated capacity is less than 1000. When the ratio of the projected area of the filler to the projected area of the recess is greater than 1.5, the part of the filler sealing the peripheral edge of the recess has too large an area, since the filler has no fixed flow direction, the filler can easily enter the welding part of the Eyelet overflow, affecting the performance of the energy storage device, thereby affecting the life of the energy storage device. In an energy storage device having a ratio of the projected area of the filler to the projected area of the recess greater than 1.5 and an energy storage device having a ratio of the projected area of the filler to the projected area of the recess of 1.5, the relationship curves between the number of cycles and the capacity maintenance rate of the former and the relation curve between the number of cycles and the capacity maintenance rate of the latter almost with each other. The ratio of the projected area of the filling member to the projected area of the recess larger than 1.5 is not more advantageous for the electric performance of the energy storage device, but increases the production cost and reduces the volume utilization of the energy storage device.

character list

• 1 zeigt ein schematisches Diagramm der dreidimensionalen Struktur einer Energiespeichervorrichtung gemäß einer Ausführungsform der vorliegenden Anmeldung.
• 2 zeigt ein schematisches Diagramm der dreidimensionalen zerlegten Struktur einer Energiespeichervorrichtung gemäß einer Ausführungsform der vorliegenden Anmeldung.
• 3 zeigt ein schematisches Diagramm der dreidimensionalen Struktur eines Verbindungselements in der Energiespeichervorrichtung gemäß einer Ausführungsform der vorliegenden Anmeldung aus einer Perspektive.
• 4 zeigt ein schematisches Diagramm der dreidimensionalen Struktur eines Verbindungselements in der Energiespeichervorrichtung gemäß einer Ausführungsform der vorliegenden Anmeldung aus einer anderen Perspektive.
• 5 zeigt eine vergrößerte Ansicht der Stelle V gemäß 4.
• 6 zeigt ein schematisches Diagramm einer dreidimensionalen Querschnittsstruktur der Enddeckelkomponente in der Energiespeichervorrichtung gemäß 1 entlang der Linie VI-VI.
• 7 zeigt eine vergrößerte Ansicht der Stelle VII gemäß 6.
• 8 zeigt ein schematisches Diagramm der dreidimensionalen zerlegten Teilstruktur einer Enddeckelkomponente in der Energiespeichervorrichtung gemäß einer Ausführungsform der vorliegenden Anmeldung.
• 9 zeigt ein schematisches Diagramm der dreidimensionalen zerlegten Teilstruktur einer Enddeckelkomponente in der Energiespeichervorrichtung gemäß einer Ausführungsform der vorliegenden Anmeldung.
• 10 zeigt ein schematisches Diagramm einer dreidimensionalen Querschnittsteilstruktur einer Enddeckelkomponente in der Energiespeichervorrichtung gemäß einer Ausführungsform der vorliegenden Anmeldung.
• 11 zeigt ein Diagramm der Beziehung zwischen der Kapazitätserhaltungsrate und der Anzahl der Zyklen der Energiespeichervorrichtung im Ausführungsbeispiel 1, Ausführungsbeispiel 2, Ausführungsbeispiel 3, Vergleichsbeispiel 1, Vergleichsbeispiel 2 und Vergleichsbeispiel 3.

In order to explain the technical solution in the exemplary embodiments of the present application more clearly, the figures to be used in the explanation of the exemplary embodiments are presented briefly below.

• 1 12 shows a schematic diagram of the three-dimensional structure of an energy storage device according to an embodiment of the present application.
• 2 12 is a schematic diagram of the three-dimensional disassembled structure of an energy storage device according to an embodiment of the present application.
• 3 12 shows a schematic diagram of the three-dimensional structure of a connection element in the energy storage device according to an embodiment of the present application from a perspective.
• 4 12 shows a schematic diagram of the three-dimensional structure of a connection element in the energy storage device according to an embodiment of the present application from a different perspective.
• 5 shows an enlarged view of the point V according to FIG 4 .
• 6 FIG. 12 is a schematic diagram of a three-dimensional cross-sectional structure of the end cap component in the energy storage device of FIG 1 along line VI-VI.
• 7 shows an enlarged view of point VII according to FIG 6 .
• 8th 12 is a schematic diagram of the three-dimensional disassembled partial structure of an end cap component in the energy storage device according to an embodiment of the present application.
• 9 12 is a schematic diagram of the three-dimensional disassembled partial structure of an end cap component in the energy storage device according to an embodiment of the present application.
• 10 12 is a schematic diagram of a three-dimensional cross-sectional partial structure of an end cap component in the energy storage device according to an embodiment of the present application.
• 11 12 is a graph showing the relationship between the capacity retention rate and the number of cycles of the energy storage device in Embodiment 1, Embodiment 2, Embodiment 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3.

DETAILED DESCRIPTION

In connection with figures in the embodiment of the present application, the technical solutions in the embodiment of the present application are explained clearly and fully in the following. Obviously, the illustrated embodiments do not represent all embodiments, but represent only part of embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative works should be considered as covered by the scope of the present application.

The following descriptions of the various embodiments are provided with reference to the accompanying figures to illustrate specific embodiments in which the present application may be implemented. The directional terms of the directions used in the description, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc. are only the directions for reference to the attached figures, and the directional terms used are therefore for better and clearer illustration and understanding of the present application and do not imply that the device or component referred to has a specific direction, is constructed in a specific direction must be and function, and are therefore not to be understood as a limitation of the present application.

Furthermore, the serial numbers assigned to components in this document, such as "first", "second", etc., are used only to distinguish the items described and have no sequential or technical significance. The terms "connection" and "coupling" in this application include direct and indirect connections (couplings) unless otherwise specified.

On a first aspect, as in 1 , 2 and 6 illustrated, the present application provides an energy storage device 100, comprising an end cap component 30, a connecting element 40 and a filling element 50. The end cap component 30 comprises an end cap 31 and an electrode terminal 32, with an lead-out hole 311 of the electrode being formed on the end cap 31, and the electrode terminal 32 covers the lead-out hole 311 of the electrode. A projection 441a is disposed on one surface of the connecting member 40 and a recess 441b is formed on the other surface, and the projection 441a is electrically connected to one end of the electrode terminal 32 . The filler 50 is filled in the recess 441b, and along the axial direction of the electrode lead-out hole 311, the ratio of the projected area of the filler 50 to the projected area of the recess 441b is greater than or equal to 1.1 and less than or equal to 1.5, and where under the condition of a full charge and discharge cycle in an environment with a current of 1 C and a temperature of 25 ° C, the number of cycles to which the energy storage device 100 is subjected when the discharge capacity of the energy storage device 100 drops to 80% of the rated capacity, is greater than or equal to 2000 and the number of cycles that the power storage device 100 undergoes when the discharge capacity of the power storage device 100 drops to 90% of the rated capacity is greater than or equal to 1000.

It is understood that the energy storage device 100 may include, but is not limited to, a single cell battery, a battery module, a battery pack, a battery system, a battery cabinet, a containerized energy storage device, and the like. When the energy storage device 100 is a single cell battery, it may be a square or cylindrical battery.

In the energy storage device 100 of the present application, a projection 441a is formed on a surface of the connecting member 40 facing the end cover 31 and is electrically connected to one end of the electrode terminal 32, for example, an electrical connection is realized by welding. The height of the electrode terminal 32 can be set smaller to save the cost. The other surface of the connecting member 40 facing away from the projection 441a is provided with a recess 441b, which faces the projection 441a, the projection 441a is welded to the electrode terminal 32 by laser welding, and the projection 441a is viewed from the side on which the recess 441b is located is laser welded to the electrode terminal 32, and the welding slag or burrs generated by welding remain on the top wall of the recess 441b, and a sticky filler 50 is fixed in the recess 441b, the filler 50 is inserted into the Recess 441b is fully filled and abuts against the side wall of the recess 441b, so that the weld slag generated by welding the projection 441a and the electrode terminal 32 is sealed and can accumulate on the filler 50 in the recess 441b. Further, along the axial direction of the electrode lead-out hole 311, the ratio of the projected area of the filler 50 to the projected area of the recess 441b is greater than or equal to 1.1, so that the filler 50 can completely seal the peripheral edge of the recess 441b to avoid welding slag builds up due to physical shock or long-term corrosion or scouring of the elec rolyte, thereby effectively preventing the electrode component 20 from short-circuiting due to the slag detachment, and improving the safety performance of the energy storage device 100 .

In addition, along the axial direction of the electrode lead-out hole 311, the ratio of the projected area of the filler 50 to the projected area of the recess 441b is greater than or equal to 1.1 and less than or equal to 1.5 under the condition of a complete charge and discharge cycle In an environment where the current is 1C and the temperature is 25°C, the filler member 50 can seal the burrs or weld slag generated when the electrode terminal 32 and the projection 441a are welded, to prevent them from spreading during the movement of the energy storage device 100 or peel off due to long-term corrosion or scouring of the electrolyte, whereby the number of cycles to which the energy storage device 100 is subjected when the discharge capacity of the energy storage device 100 drops to 80% of the rated capacity is greater than or equal to 2000 and the number of cycles to which the energy storage device 100 when the discharge capacity of the energy storage device 100 drops to 90% is greater than or equal to 1000, in this way the number of cycles of the energy storage device 100 can be effectively improved. If not expressly stated, the solutions of the embodiments of the present application tested under the same conditions. When the ratio of the projected area of the filler 50 to the projected area of the recess 441b is less than 1.1 in the axial direction of the electrode lead-out hole 311, the part of the filler 50 sealing the peripheral edge of the recess 441b has too small an area, which is easy can cause the filler member 50 to detach from the peripheral edge of the recess 441b, causing the weld slag due to shock or long-term corrosion or scouring of the electrolyte from the gap between the side wall of the recess 441b and the filler member 50 in the recess 441b onto the electrode component 20 fall, which affects the safety performance of the electrode component 20 and thus causes the number of cycles that the energy storage device 100 is subjected to when the discharge capacity of the energy storage device 100 drops to 80% of the rated capacity is less than 2000 and the number of cycles, to which the power storage device 100 is subjected when the discharge capacity of the power storage device 100 drops to 90% of the rated capacity is less than 1000. If the ratio of the projected area of the filler 50 to the projected area of the recess 441b is larger than 1.5, the portion of the filler 50 sealing the peripheral edge of the recess 441b has too large an area. When the filler 50 is filled in the recess 441b, since the filler 50 does not have a fixed flow direction, the filler 50 can easily overflow into the welding part of the eyelet, affecting the performance of the energy storage device 100, thereby affecting the life of the energy storage device 100. In an energy storage device 100 with a ratio of the projected area of the filling element 50 to the projected area of the recess 441b of greater than 1.5 and an energy storage device 100 with a ratio of the projected area of the filling element 50 to the projected area of the recess 441b of 1.5, the relationship curves overlap between of the number of cycles and the capacity maintenance rate of the former and the relationship curve between the number of cycles and the capacity maintenance rate of the latter almost with each other. The ratio of the projected area of the filling member 50 to the projected area of the recess 441b larger than 1.5 is not more advantageous for the electric performance of the energy storage device 100, but increases the production cost and reduces the volume utilization of the energy storage device 100.

Please refer 11 , 11 12 shows a graph of the relationship between the capacity retention rate and the number of cycles in Embodiment 1, Embodiment 2, Embodiment 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3. In the energy storage device 100 in Embodiment 1, the ratio of the projected area of the filler member is 50 to the projected area the recess 441b along the axial direction of the lead-out hole 311 of the electrode 1,1; in the energy storage device 100 in Embodiment 2, the ratio of the projected area of the filling member 50 to the projected area of the recess 441b along the axial direction of the lead-out hole 311 of the electrode is 1.2; in the energy storage device 100 in Embodiment 3, the ratio of the projected area of the filling member is 50 to the projected area of the recess 441b along the axial direction of the lead-out hole 311 of the electrode 1.5;in the energy storage device 100 in Comparative Example 1, the ratio of the projected area of the filling member 50 to the projected area of the recess 441b along the axial direction of the lead-out hole 311 of the electrode is 0, 3;in the energy storage device 100 in Comparative Example 2, the ratio of the projected area of the filler 50 to the projected area of the recess 441b along the axial direction of the electrode take-out hole 311 is 0.6;in the energy storage device 100 in Comparative Example 2, the ratio of the projected area of the filler 50 to the projected area of the recess 441b along the axial direction of the lead-out hole 311 of the electrode 1,6. The above The test conditions mentioned are: constant temperature test at 25°C, constant current charge at a current of 1C to 3.65V, followed by constant voltage charge at 3.65V to 0.05C, let stand for half an hour, then constant current discharge at a current of 1C to 2.5 V, leave for half an hour and start the charging cycle again. Here, the rated capacity is the initial capacity of the energy storage device 100, and when the discharge capacity of the energy storage device 100 drops to a certain percentage of the rated capacity, the certain percentage is the capacity maintenance rate of the energy storage device 100. For example, if the discharge capacity of the energy storage device 100 drops to 80% of the rated capacity, is the capacity maintenance rate of the energy storage device 100 80%; For example, when the discharge capacity of the power storage device 100 drops to 85% of the rated capacity, the capacity maintenance rate of the power storage device 100 is 85%.

From the combination of Table 1, Table 2 and 11 it can be seen that the number of cycles that the power storage device 100 in Comparative Example 1 undergoes when the discharge capacity of the power storage device 100 drops to 80.01% of the rated capacity is 1759 and is less than 2000, and it can be seen that and the number of cycles that the power storage device 100 undergoes when the discharge capacity of the power storage device 100 in Comparative Example 1 drops to 80% of the rated capacity is less than 2000; From the combination of Table 1, Table 2 and Figure, it can be seen that the number of cycles that the power storage device 100 in Comparative Example 1 is subjected to when the discharge capacity of the power storage device 100 drops to 90.01% of the rated capacity is 688 and smaller than 1000, and it can be seen that the number of cycles that the power storage device 100 undergoes when the discharge capacity of the power storage device 100 in Comparative Example 1 drops to 80% of the rated capacity is less than 1000;

The number of cycles to which the energy storage device 100 in Comparative Example 2 is subjected when the discharge capacity of the energy storage device 100 drops to 80.02% of the rated capacity is 1852 and is less than 2000, and it can be seen that the number of cycles to which the power storage device 100 is subjected to when the discharge capacity of the power storage device 100 in Comparative Example 2 drops to 80% of the rated capacity is less than 2000; and the number of cycles that the power storage device 100 in Comparative Example 2 undergoes when the discharge capacity of the power storage device 100 drops to 90.00% of the rated capacity is 511 and is less than 1000. Off 11 it can be seen that compared to the power storage device 100 in Comparative Example 2, the power storage device 100 in Comparative Example 1 peels off greatly due to shock or long-term corrosion or scouring of the electrolyte, and the capacity retention rate at the later stage decreases significantly.

The number of cycles that the power storage device 100 undergoes in Embodiment 1 when the discharge capacity of the power storage device 100 drops to 84.24% of the rated capacity is 3058 and is greater than 2000, and it can be seen that the number of cycles that the power storage device 100 in Embodiment 1 undergoes when the discharge capacity of the power storage device 100 drops to 80.00% of the rated capacity is greater than 3028 (namely, greater than 2000). The number of cycles that the power storage device 100 undergoes in Embodiment 1 when the discharge capacity of the power storage device 100 drops to 90.02% of the rated capacity is 1024 and is greater than 1000, and it can be seen that the number of cycles that the power storage device 100 in Embodiment 1 undergoes when the discharge capacity of the power storage device 100 drops to 90.00% of the rated capacity is greater than 1000.

The number of cycles that the power storage device 100 undergoes in Embodiment 2 when the discharge capacity of the power storage device 100 drops to 81.86% of the rated capacity is 3011 and is greater than 2000, and it can be seen that the number of cycles that the power storage device 100 in Embodiment 2 undergoes when the discharge capacity of the power storage device 100 drops to 80.00% of the rated capacity is greater than 3011 (namely, greater than 2000). The number of cycles that the power storage device 100 undergoes in Embodiment 2 when the discharge capacity of the power storage device 100 drops to 90.01% of the rated capacity is 1056 and is greater than 1000, and it can be seen that the number of cycles that the power storage device 100 undergoes in Embodiment 2 when the discharge capacity of the power storage device 100 drops to 90.00% of the rated capacity is greater than 1000.

The number of cycles that the power storage device 100 undergoes in Embodiment 3 when the discharge capacity of the power storage device 100 drops to 81.76% of the rated capacity is 3058 and is greater than 2000, and it can be seen that the number of cycles that the energy storage device 100 in Embodiment 2 when the discharge capacity of the power storage device 100 drops to 80.00% of the rated capacity is greater than 3058 (namely, greater than 2000). The number of cycles that the power storage device 100 in Comparative Example 2 undergoes when the discharge capacity of the power storage device 100 drops to 90.00% of the rated capacity is 1059 and is greater than 1000.

The number of cycles to which the energy storage device 100 in Comparative Example 3 is subjected when the discharge capacity of the energy storage device 100 drops to 82.20% of the rated capacity is 3011 and is greater than 2000, and it can be seen that the number of cycles to which the power storage device 100 in Comparative Example 3 undergoes when the discharge capacity of the power storage device 100 drops to 80.00% of the rated capacity is greater than 3011 (namely, greater than 2000). The number of cycles to which the energy storage device 100 in Comparative Example 3 is subjected when the discharge capacity of the energy storage device 100 drops to 90.00% of the rated capacity is 1136 and is greater than 1000, and it can be seen that the number of cycles to which the power storage device 100 in Embodiment 1 undergoes when the discharge capacity of the power storage device 100 drops to 90.00% of the rated capacity is greater than 1000.

From the combination of the first embodiment, the second embodiment and the third comparative example, it can be seen that when along the axial direction of the electrode lead-out hole 311 the ratio of the projected area of the filler 50 to the projected area of the recess 441b is 1.6, the graph of the relationship between the capacity maintenance rate and the number of cycles of the energy storage device 100 is no different from the curve of the relationship between the capacity maintenance rate and the number of cycles in Embodiments 1 and 2, so that when the ratio of the projected area of the filler member 50 to the projected area of the Recess 441b is greater than 1.5, the cycle performance of the energy storage device 100 is not significantly improved, and the cycle performance of the energy storage device 100 is not significantly affected. Further, the filling member 50 mainly uses hot melt adhesive to fill the recess 441b, before the hot melt adhesive is cured, the hot melt adhesive has no fixed flow direction and is easy to overflow into the welding part of the eyelet, affecting the connection between the eyelet and the connecting element, thereby the performance of the energy storage device 100 is degraded, resulting in the durability of the energy storage device 100 being degraded.

As in 11 1, when along the axial direction of the electrode lead-out hole 311 the ratio of the projected area of the filler 50 to the projected area of the recess 441b is 1.5 and 1.6, respectively, the relationship curves between the capacity maintenance rate of the energy storage device and the number of cycles almost overlap with each other , From this it can be seen that the ratio of the projected area of the filling element 50 to the projected area of the recess 441b cannot be more advantageous for the electrical performance of the energy storage device 100, and a ratio of the projected area of the filling element 50 to the projected area of the recess 441b of 1.6 will increase the production cost and reduce the volume utilization of the energy storage device 100, therefore, the upper limit of the ratio of the projected area of the filling member 50 to the projected area of the recess 441b is limited to 1.5 in order to effectively reduce the production cost and improve the volume utilization of the energy storage device 100. Table 1 Comparative Example 1 0.3 Comparative Example 2 0.6 Comparative Example 3 1.6 Embodiment 1 1.1 Example 2 1.2 Example 3 1.5 capacity maintenance rate 80.01% 80.02% 82.20% 84.24% 81.86% 81.76% Number of cycles 1759 1852 3011 3058 3011 3058 Table 2 Comparative Example 1 0.3 Comparative Example 2 0.6 Comparative Example 3 1.6 Embodiment 1 1.1 Example 2 1.2 Example 3 1.5 capacity maintenance rate 90.02% 90.00% 90.00% 90.02% 90.01% 90.00% Number of cycles 688 511 1136 1023 1156 1159

The energy storage device 100 further includes a housing 10 and an electrode component 20. The housing 10 may be made of a metallic material such as aluminum, an aluminum alloy, or steel. The housing 10 can also be made of an insulating material such as plastic. The case 10 may be a rectangular box-shaped structure having an opening 11 formed so that components such as the electrode component 20 and the connector 40 can be inserted into the case 10 through the opening 11 .

The electrode component 20 may include a negative electrode plate, a positive electrode plate, and a membrane, and may be formed by stacking or winding the negative electrode plate, the membrane, and the positive electrode plate. In this case, the membrane is located between the negative electrode plate and the positive electrode plate, and is used to insulate and protect the positive electrode plate and the negative electrode plate to prevent the negative electrode plate and the positive electrode plate from directly contacting and thus a short circuit occurs. An eyelet is led out on each of the negative electrode plate and the positive electrode plate, and through a connection between the eyelet and the connector 40 , the connector 40 is connected to the electrode terminal 32 to realize charging and discharging of the electrode component 20 .

In one possible embodiment, the electrode components 20 may be provided in a number of 2, wherein the two electrode components 20 are juxtaposed in the case 10 along the width direction of the case 10 to form an energy storage device 100 with higher energy density.

The end cap component 30 is used to seal the housing 10 by connecting the end cap component 30 to the opening 11 of the housing 10, the end cap component 30 is closed at the opening 11 to seal the electrode component 20 and the connecting element 40 within the housing 10, and connector 40 is located between electrode component 20 and end cap component 30 and is electrically connected between eyelet and electrode terminal 32 . The end cap component 30 includes an end cap 31 and an electrode terminal 32, the end cap 31 having a size and shape that fits the opening 11 of the housing 10 so that it can be closed at the opening 11 of the housing 10. The end cover 31 can be made of a metallic material, for example the same material as the housing 10 can be selected. In an embodiment of the present application, the end cap 31 is provided with an electrode lead-out hole 311 , a liquid filling hole 312 , and an explosion-proof valve component 313 .

Referring to 2 the electrode lead-out holes 311 are respectively provided at two ends of the end cap 31 along the length direction, that is, the electrode lead-out holes 311 are provided in a number of 2, one for installing the positive electrode terminal 32 and the other for installing the negative Electrode terminal 32 is provided to dissipate electric power from the electrode component 20 inside the housing 10 to the outside of the end cover component 30, thereby realizing the charging and discharging of the energy storage device 100. The shape of the electrode lead-out hole 311 is set according to the shape of the electrode terminal 32, for example, when the electrode terminal 32 is cylindrical, the electrode lead-out hole 311 is set as a round hole accordingly.

The liquid filling hole 312 is formed on the end cover 31 according to the predetermined dimensions, for example, the liquid filling hole 312 is provided between the two lead-out holes 311 of the electrode, so that when electrolyte is poured through the liquid filling hole 312 into the electrodes component 20 is injected in the case 10, the electrolyte can wet the electrode component 20 faster and the electrolyte can be wetted more evenly.

The explosion-proof valve component 313 is provided on the end cover 31, specifically, the explosion-proof valve component 313 includes an explosion-proof hole 3131 and an explosion-proof valve 3132, the explosion-proof hole 3131 is formed on the end cover 31 and is located at the middle position along the length direction of the end cover 31 , and the 3132 explosion-proof valve seals the 3131 explosion-proof hole. If the internal pressure of the energy storage device 100 is too high during use, the explosion-proof valve 3132 can be broken, so that the gas that forms inside the energy storage device 100 can be discharged through the explosion-proof hole 3131 to the outside of the energy storage device 100 to prevent the energy storage device 100 from exploding.

In one possible embodiment, a penetrating hole is formed on a side of the projection 441a connected to the electrode terminal 32 . The area of the penetrating hole is smaller than the area of the projection 441a along the axial direction of the electrode lead-out hole 311, when the projection 441a is welded to the 32, the welding can be done through the penetrating hole, thereby welding the projection 441a to the electrode terminal 32 is relieved, and the recess 441b is filled with the filler 50, so that the burrs or welding slag generated during welding are sealed and can accumulate on the filler 50. It is understood that in another embodiment, it is possible that no penetration hole is formed on a side of the projection 441a connected to the electrode terminal 32, so that the burrs or welding slag generated when the projection 441a and the electrode terminal 32 are welded does not easily fall on the Electrode component 20 fall to ensure the safety performance of the electrode component 20.

Referring to 3 and 7 The filling member 50 comprises a main body portion 51 and a first flange portion 53, the first flange portion 53 protruding from an outer peripheral surface far from the main body portion 51 along the radial direction of the electrode lead-out hole 311. Here, the main body portion 51 is provided in the recess 441b and is at least partially exposed in the recess 441b, the first flange portion 53 is connected to the part of the main body portion 51 exposed in the recess 441b, and the main body portion 51 is fixed to the side wall of the recess 441b applied. Since the side wall of the recess 441b abuts the main body portion 51 when the projection 441a is welded to the electrode terminal 32, there is no gap between the side wall of the recess 441b and the main body portion 51. The test indicates that it avoids that the welding of the Projection 441a with the electrode terminal 32 generated welding slag fall. Further, the filling member 50 is sticky and may partially accumulate the welding slag on the filling member 50 to further prevent the welding slag from falling off the recess 441b and hence the welding effect of the electrode terminal 32 and the connecting member 40 is impaired. Further, the first flange portion 53 protrudes from the outer peripheral surface of the part of the main body portion 51 exposed in the recess 441b along the radial direction of the lead-out hole 311 of the electrode so that the first flange portion 53 covers and abuts the peripheral edge of the recess 441b, namely the first Flange portion 53 attaches to the surface of the connecting member 40 at the peripheral edge of the recess 441b to completely seal the recess 441b, even if there is a gap between the main body portion 51 and the side wall of the recess 441b, the first flange portion 53 can also absorb the welding slag in the recess 441b accumulate, which further prevents the welding slag from falling onto the electrode component 20 from the open side of the recess 441b due to shock or long-term corrosion or scouring of the electrolyte, to ensure the safety of the electrode component 20, so that the number of cycles to which the Energy storage device 100 is subjected when the discharge capacity of the energy storage device 100 drops to 80% of the rated capacity is greater than or equal to 2000; further, the number of cycles that the power storage device 100 undergoes when the discharge capacity of the power storage device 100 drops to 90% is greater than or equal to 1000 to increase the number of cycles of the power storage device 100 effectively. Since the ratio of the projected area of the filling member 50 to the projected area of the recess 441b of the connecting member 40 is limited to 1.1-1.5, occupying the space of the connecting member 40 is avoided from reducing the remaining space inside the energy storage device 100. which in turn leads to an increase in the pressure of the energy storage device 100 after the circulating gas generation inside, thus improving the safety and durability of the energy storage device 100 .

Further, the first flange portion 53 has a thickness of (0.1 mm, 4.0 mm] along the axial direction of the electrode take-out hole 311. For example, the thickness of the first flange portion 53 along the axial direction of the electrode take-out hole 311 may be 0.5 mm, 0.8mm, 1.0mm, 1.5mm, 2.1mm, 2.4mm, 2.7mm, 3.1mm, 3.5mm or 4.0mm are what's here If the first flange portion 53 has a thickness of less than 0.1 mm, the first flange portion 53 is susceptible to being worn by other components due to too small a thickness and peels off from the peripheral edge of the recess 441b; the first flange portion 53 has a thickness greater than 4.0 mm, the first flange portion 53 has too large a thickness and a larger weight, so that when the energy storage device is moved or the electrolyte is scoured for a long time, the filling member 50 easily detaches from the peripheral edge of the recess 441b. In the present application, the thickness of the first flange portion is set to (0.1mm, 4.0mm] in order to improve the bonding strength between the first flange portion 53 and the peripheral edge of the recess 441b, reducing the risk of the filler 50 peeling off from the It is understood that a thickness of a part 51 of the main body portion 51 exposed in the recess 441b along the axial direction of the electrode lead-out hole 311 can be the same as a thickness of the first flange portion 53 along the axial direction of the electrode lead-out hole 311 , so that a side face of the main body portion 51 far from the electrode terminal 32 is flush with a side face of the first flange portion 53 far from the electrode terminal 32 .

The filling member 50 may be a hot-melt adhesive that can be heated to a molten state during assembly of the energy storage device 100 and then dropped into the recess 441b and cover the edges of the recess 441b, and then the hot-melt adhesive can be cured Weathering are accelerated, and the cured hot melt adhesive forms the filler 50 of the present application.

Please refer 3 and 4 , the electrode terminal 32 is electrically connected to the electrode component 20 through the connecting member 40 . The connectors 40 may be provided in a number of 2, one connected to an electrode terminal 32 and the positive eyelet on the electrode component 20 and the other connected to another electrode terminal 32 and the negative eyelet on the electrode component 20 .

The connecting member 40 includes a first surface 41 and a second surface 42 which are opposed to each other along the axial direction of the electrode lead-out hole 311, the first surface 41 being farther from the electrode terminal 32 compared to the second surface 42, and the first surface is recessed to form the recess 441b, and at a position of the second surface 42 corresponding to the recess 441b, the projection 441a is formed, specifically, the connecting member 40 not forming the recess 441b and the projection 441a may be punched are so that the connecting member 40 forms a recess 441b and a projection 441a corresponding to each other. At least a portion of the first surface 41 is used to connect the eyelet of the electrode component 20 and at least a portion of the second surface 42 is used to connect the electrode terminal 32 . The recess 441b is formed so as to be recessed from the first surface 41 toward the second surface 42, with the protruding part constituting the projection 441a, and the top surface of the projection 441a protrudes from the second surface 42, and the Projection 441a is electrically connected to the electrode terminal 32, so that the height of the electrode terminal 32 can be made relatively small to save the cost. The recess 441b includes a top wall (on a side close to the electrode terminal 32) and a side wall, one side wall being connected to both ends of the top wall along the radial direction of the electrode lead-out hole 311, and the top wall and the two side walls together form the recess 441b. At this time, the protrusion 441a is connected to the electrode terminal 32, which can be done by welding such as laser welding.

The connecting element 40 can comprise a first section 43, a second section 44 and a third section 45, wherein the first section 43, the second section 44 and the third section 45 can be formed integrally with each other, or the first section 43, the second section 44 and the third portion 45 may be formed separately and the three may be integrally joined together by welding, clamping, etc. The second section 44 is connected between the first section 43 and the third section 45, with the first section 43 and the third section 45 being arranged at two opposite ends of the second section 44, and with the first section 43 and the third section 45 each on a first side 444 of the second section 44 befin whereby the connecting member 40 is formed into a U-shape as a whole to connect two electrode components 20 through a connecting member 40. FIG.

The structures of the first section 43 and the third section 45 may be similar, in the present application the structures of the first section 43 and the third section 45 are the same, only they are connected to different positions on the second section 44 . The first section 43, the second section 44 and the third section 45 can each be formed as a substantially rectangular structure.

Further, the second section 44 comprises a first end 442 and a second end 443 arranged opposite to one another, the first section 43 being connected to the first end 442 and the third section 45 being connected to the second end 443 . Or the first section 43 can be connected to the second end 443 where the third section 45 can be connected to the first end 442 . In this way, the connecting member 40 has a U-shaped structure as a whole, the first portion 43 can be used for connecting one electrode component 20 and the third portion 45 can be used for connecting another electrode component 20 . The present application is illustrated in detail with an example in which the first section 43 is connected to the first end 442 and the third section 45 is connected to the second end 443 .

The recess 441b is located on the second section 44 so that the connection between two electrode components 20 and the electrode terminal 32 is realized by a connecting element 40 in order to increase the energy density of the energy storage device 100 and at the same time save the arrangement of the connecting element 40 . Along the axial direction of the electrode lead-out hole 331, the projected area of the filler 50 is smaller than the projected area of the second portion 44 to avoid over-adhering the filler 50 from interfering with the connection of the connector 40 to the other components of the energy storage device 100. By ensuring that the filler 50 seals the recess 441b, the area of the filler 50 covering the second portion 44 is reduced to reduce the use of the filler 50 and save the cost effectively.

Further, the difference between the diameter of the filler 50 and the diameter of the recess 441b along the radial direction of the electrode lead-out hole 311 is [0.2 mm, 10.0 mm]. Here, the maximum projected shape of the recess 441b is circular, and the maximum projected shape of the filler 50 is circular.

It can be seen that when the difference between the diameter of the filler 50 and the diameter of the recess 441b is less than 0.2mm and the ratio of the projected area of the filler 50 to the projected area of the recess 441b is less than 1.1, the The part of the filling member 50 connected to the peripheral edge of the recess 441b has too small an area, so that when the energy storage device 100 moves or the electrolyte scours for a long time, the filling member 50 easily peels off from the peripheral edge of the recess 441b, which may cause the Welding slag due to shock or long-term corrosion or scouring of the electrolyte falls onto the electrode component 20 from the gap between the side wall of the recess 441b and the filler 50 in the recess 441b, and thus the safety performance of the electrode component 20 is impaired. When the difference between the diameter of the filler 50 and the diameter of the recess 441b is larger than 10.0 mm, the area of the second portion 44 is set larger, and the laying area of the filler 50 is also set too large, resulting in high production cost . Since the filler 50 does not have a fixed flow direction, the filler 50 can easily overflow into the welded part of the eyelet (namely, the first portion 43 and the third portion 45), affecting the performance of the energy storage device 100, thereby affecting the life of the energy storage device 100. Along the radial direction of the electrode lead-out hole 311, the difference between the diameter of the filler 50 and the diameter of the recess 441b is [0.2mm, 10.0mm], for cost saving, it is ensured that the ratio of the projected area of the filler 50 to that The projected area of the recess 441b is greater than or equal to 1.1 and less than or equal to 1.5, so that the filler 50 can completely seal the peripheral edge of the recess 441b to prevent the welding slag from piling up due to shock or long-term corrosion or scouring of the Electrolyte peel off, thereby effectively preventing the electrode component 20 from short-circuiting due to the peeling off of the slag and improving the safety performance of the energy storage device 100 . Further, the filler 50 can seal and accumulate the burrs generated when the electrode terminal 32 and the projection 441a are welded to avoid detaching them during movement of the energy storage device 100 or due to long-term corrosion or scouring of the electrolyte, thereby increasing the number of cycles that the energy storage device 100 is subjected to when the discharge capacity of the energy storage device 100 drops to 80% of the rated capacity, or is equal to 2000 and the number of cycles that the power storage device 100 undergoes when the discharge capacity of the power storage device 100 drops to 90% of the rated capacity is greater than or equal to 1000, in this way the number of cycles of the power storage device 100 can be effectively improved.

On a side of the first end 442 far from the first portion 43, a notch 46 is formed. Or, on a far side of the second end 443 from the third portion 45, a notch 46 is formed. Or, the notches 46 are provided in a number of 2, one notch 46 being formed on a far side of the first end 442 from the first portion 43, and one notch 46 being formed on a side of the second end 443 far away from the third portion 45 Notch 46 is formed. When the first end 442 and the second end 443 are each provided with a notch 46, the notch 46 of the first end 442 and the notch 46 of the second end 443 have different shapes, e.g. the notch formed at the first end 442 is a sharp notch ( as the notch 46 according to 3 ) and the notch 46 formed at the second end 443 is a rounded notch such that the first end 442 and the second end 443 of the second portion 44 form an asymmetric structure. In one embodiment of the present application, the notch 46 is located at a corner of the first end 442, and no notch 46 is formed at a corner on a far side of the second end 443 from the third portion 45, so that the first end 442 and the second end 443 of the second portion 44 form an asymmetric structure, and when installing the connector 40, it can be detected by the notch 46 whether the front side and the rear side (namely, the first face 41 and the second face 42) of the connector 40 are installed reversely to ensure that the protrusion 441a can be closer to the electrode terminal 32, thereby reducing the height by which the electrode terminal 32 extends along the axial direction of the electrode lead-out hole 311, further it can be through the notch 46 to determine if the positive connector 40 and negative connector 40 are installed in the wrong position to achieve a poka-yoke function.

Further, a second side 445 of the second portion 44 includes a protruding portion 47, wherein the second side 445 is opposite the first side 444, and wherein the protruding portion 47 is between the first end 442 and the second end 443, and wherein at least a part 44 of the projection 441a is located on the protruding portion 47. When installing the connector 40, the connector 40 can be positioned on the end cap component 30 by the protruding portion 47 located on the second portion 44 to prevent the connector 40 on the end cap component 30 from wobbling, which ensures that the protrusion 441a the connecting member 40 can be aligned with the lead-out hole 311 of the electrode, thus ensuring the accuracy of the connection between the projection 441a and the electrode terminal 32. Further, at least a part of the projection 441a is in the place of the protruding portion 47, and the distance from the first side 444 of the second portion 44 to the second side 445 can be set relatively small to save the cost; and compared to the second portion 44, the protruding portion 47 is farther from the first portion 43 and the third portion 45 to effectively prevent the filler 50 from overflowing to the first portion 43 and the third portion 45 when injection molding the filler 50 , which ensures the stability of the connection between the first portion 43 and the lug and the stability of the connection between the third portion 45 and the lug, thus ensuring the performance and durability of the energy storage device 100 .

Referring to 5 the connection element 40 further comprises a welding position 48 which is provided on the second surface 42 . Since the second surface 42 is closer to the electrode terminal 32 compared to the first surface 41, a welding position 48 is arranged on a second surface 42 of the connecting element 40 that is close to the electrode terminal 32 when the connecting element 40 is welded to the eyelet on the electrode component 20 , the welding can be performed by aligning the welding position 48 on the second surface 42 with a position on the connector 40 corresponding to the eyelet, thereby preventing wrong welding when welding the connector 40 to the eyelet on the electrode component 20 to improve the weld strength between the connector 40 and the eyelet and the overflow capacity of the connector 40.

Referring to 1 , corresponds to the welding position 48 on the connecting member 40 when the electrode component 20 and the connecting member 40 are respectively installed in the housing 10, along the axial direction of the lead-out hole 311 of the electrode of the lug on the electrode component 20. In the present application, the energy storage device comprises 100 Twin electrode components 20. With respect to the positive connector 40, the welding position 48 on the first portion 43 corresponds to a position where the eyelet is on an electrode component 20, and when the first portion 43 is welded to the eyelet on an electrode component 20, can through the welding position 48 on the first section 43 the welding point can be determined; the welding position 48 on the third portion 45 corresponds to a position where the eyelet is on the other electrode component 20, and when the third portion 45 is welded to the eyelet on the other electrode component 20, the welding position 48 on the third portion 45 can Welding point can be determined, thereby preventing incorrect welding when welding the eyelet to the connector 40, to ensure the welding strength between the connector 40 and the eyelet and the overflow capacity of the connector 40.

Furthermore, the welding position 48 is arranged at the first section 43 and third section 45, in the present application the energy storage device 100 comprises double electrode components 20, the first section 43 is connected to the eyelet on an electrode component 20, and when welding is carried out by the welding position 48 at first section 43 positions the eyelet on the electrode component 20 to ensure the accuracy of the connection between the eyelet and the first section 43; the first section 45 is connected to the eyelet on the other electrode component 20 and the weld position 48 on the third section 45 positions the eyelet on the electrode component 20 to ensure the accuracy of the connection between the eyelet and the third section 45. Further, the welding position 48 is provided on the first portion 43 and third portion 45 to avoid the filling member 50 on the second portion 44 overflowing to the welding position 48 and thus affecting the accuracy of the connection between the connecting member 40 and the eyelet, causing the Performance of the energy storage device 100 ensures. Further, the connection between two electrode components 20 and the electrode terminal 32 is realized using a connector 40 by connecting the projection 441a on the second portion 44 to the electrode terminal 32 to reduce the number of connectors 40 arranged and save the cost.

Further, the welding position 48 includes a plurality of first concave portions 481, the first concave portion 481 being formed to be recessed from the second surface 42 toward the first surface 41, and the depth by which the first concave portion 481 is recessed is, is smaller than the thickness of the connecting element 40. Here, each of the depth direction and the thickness direction may be the axial direction of the electrode lead-out hole 311 . When welding the connector 40 with the eyelet, the part located at the first concave portion 481 (namely, the bottom wall of the first concave portion 481) of the connector 40 with the eyelet can be welded, and the weld slag generated by welding can be contained in the first concave portion 481 to prevent the welding slag from falling into the electrode component 20. Further, the depth by which the first concave portion 481 is depressed is smaller than the thickness of the connecting member 40, and by controlling the depth by which the first concave portion 481 is depressed, the welding thickness of welding the connecting member 40 with the Eyelet can be determined, compared to manually determining the welding thickness when welding, the welding step becomes simpler, and it is easier to ensure that the thickness of the bottom wall of the first concave portion 481 meets the welding strength requirement to achieve the welding effect of the To ensure welding of the connecting element 40 with the eyelet.

Further, the ratio of the depth by which the first concave portion 481 is recessed to the thickness of the connecting member 40 is in the range of [0.06, 0.19]. For example, the ratio may be 0.06, 0.08, 0.09, 0.10, 0.11, 0.13, 0.14, 0.16, 0.17, 0.18, or 0.19 as long as the ratio is in the range of [0.06, 0.19], which is not listed here. If the ratio between the depth by which the first concave portion 481 is recessed and the thickness of the connecting member 40 is less than 0.06, with a fixed thickness of the connecting member 40, the thickness of the bottom wall of the first concave portion 481 becomes too small , which lowers the strength of welding the bottom wall of the first concave portion 481 with the eyelet, and cracking easily occurs in long-term use, affecting the overflow capacity of the connecting member 40. If the ratio between the depth by which the first concave portion 481 is recessed and the thickness of the connecting member 40 is larger than 0.19, with a fixed thickness of the connecting member 40, the thickness of the bottom wall of the first concave portion 481 becomes too large , which increases the difficulty of welding. The ratio between the depth to which the first kon concave portion 481 is depressed, and the thickness of the connecting member 40 is in the range of [0.06, 0.19], so that the thickness of the bottom wall of the first concave portion 481 is in the appropriate range to meet the welding strength requirement of welding the connector 40 to the eyelet, effectively avoiding that cracking occurs at the joint between the connector 40 and the eyelet and thus affecting the overflow capacity of the connector 40, thereby ensuring that when the ratio of the Projection area of the filling element 50 to the projection area of the recess 441b is greater than or equal to 1.1 and less than or equal to 1.5, the number of cycles to which the energy storage device 100 is subjected when the discharge capacity of the energy storage device 100 drops to 80% of the rated capacity, is greater than or equal to 2000 and the number of cycles that the power storage device 100 undergoes when the discharge capacity of the power storage device 100 drops to 90% of the rated capacity is greater than or equal to 1000.

Further, the projection shape of the first concave portion 481 along the axial direction of the electrode lead-out hole 311 can be prismatic, and when the bottom wall of the first concave portion 481 is welded to the eyelet, the prismatic configuration of the first concave portion 481 is easier to identify. and thus, it is easier to determine the welding point where the connector 40 is welded to the eyelet to ensure the accuracy of welding between the connector 40 and the eyelet and the overtravel capacity of the connector 40. Also, the cross section of the first concave portion 481 may be circular, rectangular, triangular or other polygonal shape, which is not limited in the present application. The plurality of first concave portions 481 substantially form a circular portion on the second face 42 of the connecting member 40, the circular portions being provided in a number greater than 1, and the plurality of circular portions being arranged along the length direction of the connecting member 40, In this way, in order to determine the position of the first concave portion 481 more easily, the welding position of welding the connecting member 40 to the eyelet is determined based on the position of the first concave portion 481 .

Referring to 2 , 6 and 7 , the end cap component 30 further comprises a first insulating member 33 and a sealing member 34. The first insulating member 33 forms a bore 331, the first insulating member 33 being connected to the end cap 31, and the bore 331 corresponding to the lead-out hole 311 of the electrode, and wherein along the axial direction of the electrode lead-out hole 311, the protrusion 441a penetrates the bore 331 and the electrode lead-out hole 311 sequentially, and the side walls of the protrusion 441a and the bore 331 abut against each other. The sealing member 34 is fitted on a far side of the electrode lead-out hole 311 from the first insulating member 33, the sealing member 34 abutting against the electrode terminal 32, and the sealing member 34 is used to establish an insulated connection between the connecting member 40 and the End cover 31 to produce. A first insulating member 33 is disposed between the end cap 31 and the connecting member 40 to insulate and protect the end cap 31 and the connecting member 40, a hole 331 is provided at a position of the first insulating member 33 corresponding to the lead-out hole 311 of the electrode, and the projection 441a of the connecting member 40 penetrates the bore 331 and the lead-out hole 311 of the electrode in sequence and is located in the lead-out hole 311 of the electrode, the side wall of the projection 441a (namely, the side wall of the recess 441b) abuts the side wall of the bore 331, so that the height of the electrode terminal set along the axial direction of the electrode lead-out hole 311 can be set smaller to save the cost; further, a sealing member 34 is fitted on a side of the electrode lead-out hole 311 far from the first insulating member 33, the sealing member 34 being fitted on a side of the electrode leading-out hole 311 far from the first insulating member 33 and abutted against the electrode terminal 32 to insulate and protect the end cap 31 and the electrode terminal 32, thereby preventing a short circuit from occurring between the end cap 31 and the electrode terminal 32 and thus affecting the number of cycles of the energy storage device 100.

The shape of the first insulating member 33 is adapted to the shape of the end cap 31, and the first insulating member 33 is also provided with a hole corresponding to the liquid filling hole 312 and a hole corresponding to the explosion-proof hole 3131. The bore 331 and the lead-out hole 311 of the electrode are each round holes.

Referring to 8th and 9 , the connecting element 40 is fastened to the first insulating element 33, in particular on a side of the first insulating element which faces the connecting element 40 lements 33 formed a restriction groove 332, which is used to cooperate with the protruding portion 47 on the connecting member 40 so that the second side 445 of the second portion 44 abuts against the edge portion of the both sides of the restriction groove 332, whereby the projection 441a on the Connecting element 40 can be aligned with the bore 331 on the first insulating element 33 . The cross section of the protruding portion 47 may be trapezoidal, accordingly, the projection shape of the restricting groove 332 along the axial direction of the electrode lead-out hole 311 is also trapezoidal, and the protruding portion 47 is arranged in the restricting groove 332 .

Referring to 10 , the sealing member 34 may be a sealing ring made of an insulating material such as rubber, and the sealing member 34 is fitted to the side wall of the lead-out hole 311 of the electrode. The sealing member 34 includes a restricting portion 341 and a convex portion 342. The convex portion 342 extends along the axial direction of the electrode take-out hole 311 and abuts against the side wall of the electrode take-out hole 311 to insulate the side wall of the electrode take-out hole 311 , so that an insulating connection between the connecting element 40 and the end cover 31 can be made to avoid a short circuit. The restricting portion 341 extends from an end far from the connector 40 of the outer peripheral surface of the convex portion 342 along the radial direction of the lead-out hole 311 of the electrode, and on the peripheral edge of a side of the end cover 31 far from the connector 40 is the lead-out hole 311 the electrode surrounding fitting portion 316 is formed, the restricting portion 341 fits with the fitting portion 316, and the electrode terminal 32 is abutted against the restricting portion 341, so that the electrode terminal 32 is insulatingly connected to the end cover 31 to avoid the electrode terminal 32 directly comes into contact with the end cap 31 and a short circuit occurs. Here, the outer peripheral surface of the convex portion 342 is a side surface of the convex portion 342 opposite to the side wall of the recess 441b.

Along the radial direction of the electrode lead-out hole 311, the fitting portion 316 may be formed so as to be recessed in a direction far from the electrode lead-out hole 311, namely, the fitting portion 316 is arranged as a concave portion; or the fitting portion 316 comprises a concave portion and a protruding block, wherein compared to the concave portion, the protruding block is closer to the lead-out hole 311 of the electrode, accordingly, the restricting portion 341 is provided with a bulge fitting into the concave portion, so that the Limiting portion 341 is embedded in the concave portion of the fitting portion 351 to limit the limiting portion 341 along the radial direction of the electrode lead-out hole 311 .

Please refer 2 , 9 and 10 , the end cap component 30 further comprises a second insulating member 35 and a pressing block 36, wherein the second insulating member 35 comprises at least part of the electrode terminal 32 so that the electrode terminal 32 is fixed to the second insulating member 35, further the second insulating member 35 can press the electrode terminal 32 isolate and protect. One end of the pressing block 36 is connected to the second insulating member 35 , the other end of the pressing block 36 is connected to the end cap 31 so that the electrode terminal 32 is fixed to the end cap 31 through the pressing block 36 and the second insulating member 35 .

Further, the second insulating member 35 includes a first body portion 351 and a second flange portion 352, wherein the second flange portion 352 extends from an end far from the connecting member 40 of the inner peripheral surface of the first body portion 351 toward the electrode terminal 32 along the radial direction of the electrode lead-out hole 311 extends, and wherein the first body portion 351 and the second flange portion 352 together form a through hole 353. The electrode terminal 32 includes a second body portion 321 and a protruding block 322, wherein the protruding block 322 extends from the upper surface of the second body portion 321 along the axial direction of the electrode lead-out hole 311 toward a side far from the end cap 31, and where the first body portion 351 and the second flange portion 352 surround the second body portion 321 , and the second flange portion 352 surrounds the protruding block 322 to fix the electrode terminal 32 to the through hole 353 . At this time, the protruding block 322 is located at the center portion of the upper surface of the second body portion 321. When assembling the electrode terminal 32 and the second insulating member 35 on the end cap 31, the second body portion 321 is aligned with the electrode lead-out hole 311 and placed on the end cap 31, then when the second insulating member 35 is fitted on the electrode terminal 32, the lower surface of the second flange portion 352 is abutted against an edge of the second main body portion 321 provided with no protruding block 322, namely, along the axial direction of the through hole 353, the electrode terminal 32 is penetrated by the second flange portion 352 to prevent the electrode terminal 32 from wobbling along the axial direction of the through hole 353 . Further, the inner peripheral surface of the second flange portion 352 is abutted against the peripheral surface of the protruding block 322, with the first body portion 351 surrounding the second body portion 321, and wherein along the radial direction of the through hole 353, the first body portion 351 and the second flange portion 352 together form the electrode terminal 32 limit to prevent the electrode terminal 32 from wobbling along the axial direction of the through hole 353, whereby the electrode terminal 32 is fixed to a position of the end cover 31 corresponding to the lead-out hole 311 of the electrode to avoid the possibility of unstable connection between the electrode terminal 32 after it was loaded with an external force and the second insulating member 35, moreover, the electrode terminal 32 can be positioned at the electrode lead-out hole 311, so that the electrode terminal 32 at the recess 441b on the connector 40 can be accurately positioned.

In the embodiment, the second insulating member 35 and the pressing block 36 are formed integrally with each other by injection molding.

Further, the second insulating member 35 includes a receiving groove 354 extending from an end of the outer peripheral surface of the first body portion 351 close to the connecting member 40 toward the second flange portion 352 in a direction facing the electrode lead-out hole 311 . The pressing block 36 includes a first connecting portion 361, a transition portion 362 and a second connecting portion 363 which are sequentially connected, the first connecting portion 361 being connected to the end cap 31, and the second connecting portion 363 and the transition portion 362 being received in the receiving groove 354 are. During injection molding, the second connection portion 363 and the transition portion 363 are injection molded in the receiving groove 354, so that the pressing block 36 and the second insulating member 35 are integrally formed with each other.

Referring to 7 , the receiving groove 354 is an annular groove, wherein the first connecting portion 361, the transition portion 362 and the second connecting portion 363, which are sequentially connected, extend along a Z-shaped direction to form an annular structure provided with holes , and wherein the first connecting portion 361 and the second connecting portion 363 extend along the radial direction of the through hole 353, and wherein the transition portion 362 extends substantially inclined along the axial direction of the through hole 353 and between the first connecting portion 361 and the second connecting portion 363 is connected, and the press block 36 is used to support the second insulating member 35 . The second flange portion 353 extends from an end of the inner peripheral surface of the first body portion 351 far from the connector 40 toward the electrode terminal 32 along the radial direction of the electrode lead-out hole 311 , the receiving groove 354 extends from an end close to the connector 40 of the outer peripheral surface of the first body portion 351 in a direction facing the lead-out hole 311 of the electrode toward the second flange portion 352, the second connecting portion 363 and the transition portion 362 of the pressing block 36 are received in the receiving groove 354, and the first connecting portion 361 is connected to the end cap 31 After the first connecting portion 361 is fixed to the end cap 31, the second insulating member 35 and the second main body portion 321 of the electrode terminal 32 are tightly pressed by the second connecting portion 363, so that the second main body portion 321 can be stably fixed to the end cap 31 to to prevent the second body portion 321 and the second insulating member 35 from peeling off the end cap 31, which improves the stability of the structure of the end cap component 30.

Further, the end cap 31 includes a third flange portion 314 and a second concave portion 315, the second concave portion 315 being formed so as to recess from a side surface of the end cap 31 far from the connecting member 40 along the axial direction of the electrode lead-out hole 311 and along the radial direction of the electrode lead-out hole 311 the third flange portion 314 is located between the fitting portion 316 and the second concave portion 315, namely, on the peripheral edge of the electrode lead-out hole 311 and along the radial direction of the electrode lead-out hole 311 one of the connecting member 40 far away side surface of the end cap 31 in succession with a fitting portion 316, a third flange portion 314 and a second concave portion 315 are provided. The third flange portion 314 and the second concave portion 315 are each arranged so as to surround the peripheral edge of the fitting portion 316, with the first body portion 351 and the first connecting portion 361 being arranged in the second concave portion 315, in this way the first body portion 351 may be fixed to the end cap 31 by being limited by the third flange portion 314 in the radial direction of the lead-out hole 311 of the electrode to prevent the second insulating member 35 from peeling off the end cap 31, thereby enhancing the stability of the connection between the second insulating member 35 and the electrode terminal 32 is secured. At this time, the first body portion 351 and the first connecting portion 361 may be fixed to the bottom wall of the second concave portion 315 by welding.

Further, the end cap component 30 may further comprise a top patch 37 disposed on a side surface of the end cap 31 remote from the connecting member 40, the top patch 37 having a similar dimensional structure to the end cap 31, and the top patch 37 having a hole, corresponding to the lead-out hole 311 of the electrode, a hole corresponding to the explosion-proof hole 3131 , and a hole corresponding to the liquid filling hole 312 . The top patch 37 may be made of an insulating material such as a plastic to insulate and protect the end cap 31.

• nachdem die Elektrodenkomponente 20 und das Verbindungselement 40 jeweils in dem Gehäuse 10 platziert wurden und die Enddeckelkomponente 30 an der Öffnung 11 des Gehäuses 10 geschlossen wurde, wird durch die Schweißposition 48 das Verbindungselement 40 auf die Öse an der Elektrodenkomponente 20 ausgerichtet, um die elektrische Verbindung zwischen dem Verbindungselement 40 und der Öse an der Elektrodenkomponente 20 zu realisieren. Nachdem die Verklebung der Energiespeichervorrichtung 100 abgeschlossen war, wird der Vorsprung 441a am Verbindungselement 40 mit dem Elektrodenanschluss 32 geschweißt und der Heißschmelzkleber anschließend in die Aussparung 441b getropft, und der Heißschmelzkleber wird einer Verwitterung unterzogen, um die Aushärtegeschwindigkeit des Heißschmelzklebers zu erhöhen, und das Verhältnis der Projektionsfläche des ausgehärteten Heißschmelzklebers (d.h. des Füllelements 40) in der axialen Richtung des Herausführungslochs 311 der Elektrode zu der Projektionsfläche der Aussparung 441b wird auf größer oder gleich 1,1 und kleiner oder gleich 1,5 kontrolliert.

In particular, the assembly of the energy storage device 100 proceeds as follows:

• after the electrode component 20 and connector 40 have each been placed in the housing 10 and the end cap component 30 has been closed at the opening 11 of the housing 10, the weld position 48 aligns the connector 40 with the eyelet on the electrode component 20 to establish the electrical connection to be realized between the connecting element 40 and the eyelet on the electrode component 20 . After the bonding of the energy storage device 100 was completed, the projection 441a on the connecting member 40 is welded to the electrode terminal 32, and the hot melt adhesive is then dropped into the recess 441b, and the hot melt adhesive is subjected to weathering to increase the curing speed of the hot melt adhesive and the ratio of the projected area of the hardened hot-melt adhesive (ie, the filler member 40) in the axial direction of the electrode lead-out hole 311 to the projected area of the recess 441b is controlled to be greater than or equal to 1.1 and less than or equal to 1.5.

In a second aspect, the present invention discloses a power-consuming device including the energy storage device 100 in the first aspect. The technical solutions of the embodiment of the present application are all applicable to various power-consuming devices using the energy storage device 100, such as battery vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, mobile phones, portable devices, handheld computers, laptop computers, etc.

In the power-consuming device of the present application, a projection 441a is formed on a surface of the connector 4 facing the end cover 31 in the energy storage device 100, which is electrically connected to an end of the electrode terminal 32, e.g. by welding, so that the height of the electrode terminal 32 is smaller can be set to save the cost. The other surface of the connecting member 40 opposite to the projection 441a is provided with a recess 441b facing the projection 441a, and a sticky filler 50 is fixed in the recess 441b, the filler 50 is fully filled in the recess 441b and abuts the side wall of the recess 441b so that the welding slag generated by welding the projection 441a and the electrode terminal 32 is sealed and can accumulate on the filler 50 in the recess 441b. Further, along the axial direction of the electrode lead-out hole 311, the ratio of the projected area of the filler 50 to the projected area of the recess 441b is greater than or equal to 1.1, so that the filler 50 can completely seal the peripheral edge of the recess 441b to avoid the welding slag peels off due to shock or long-term corrosion or scouring of the electrolyte, thereby effectively preventing the electrode component 20 from short-circuiting due to the slag peeling-off and improving the safety performance of the energy storage device 100 .

In addition, along the axial direction of the electrode lead-out hole 311, the ratio of the projected area of the filler 50 to the projected area of the recess 441b is greater than or equal to 1.1 and less than or equal to 1.5, under the condition of complete charging and discharging cycle, in an environment where the current is 1 C and the temperature is 25°C, the filler member 50 can seal the burrs or weld slag generated when the electrode terminal 32 and the projection 441a are welded, to prevent them from spreading during the movement of the energy storage device 100 or peel off due to long-term corrosion or scouring of the electrolyte, whereby the number of cycles to which the energy storage device 100 is subjected when the discharge capacity of the energy storage device 100 drops to 80% of the rated capacity is greater than or equal to 2000 and the number of cycles to which the energy storage device 100 when the discharge capacity of the power storage device 100 drops to 90% of the rated capacity is greater than or equal to 1000, in this way the number of cycles of the power storage device 100 can be effectively improved. If, in the axial direction of the electrode lead-out hole 311, the ratio of the projected area of the filler 50 to the projected area of the recess 441b is less than 1.1, the portion of the filler 50 sealing the peripheral edge of the recess 441b has too small an area, which is easy to do may cause the filler member 50 to detach from the peripheral edge of the recess 441b, causing the weld slag to fall onto the electrode component 20 from the gap between the side wall of the recess 441b and the filler member 50 in the recess 441b due to shock or long-term corrosion or scouring of the electrolyte , which affects the safety performance of the electrode component 20 and thus leads to the fact that the number of cycles to which the energy storage device 100 is subjected when the discharge capacity of the energy storage device 100 drops to 80% of the rated capacity is less than 2000 and the number of cycles to which the power storage device 100 is subjected to when the discharge capacity of the power storage device 100 drops to 90% of the rated capacity is less than 1000. If the ratio of the projected area of the filler 50 to the projected area of the recess 441b is larger than 1.5, the portion of the filler 50 sealing the peripheral edge of the recess 441b has too large an area. When the filler 50 is filled in the recess 441b, since the filler 50 does not have a fixed flow direction, the filler 50 can easily overflow into the welding part of the eyelet, affecting the performance of the energy storage device 100, thereby affecting the life of the energy storage device 100.

The above content represents only preferred embodiments of the present application. Those skilled in the art can make various improvements and modifications without departing from the technical principles of the present application. The improvements and modifications should be construed as included within the scope of the present application.

Reference List

100

energy storage device

10

Housing

11

opening

20

electrode component

30

end cap component

31

end cap

311

Electrode exit hole

312

liquid filling hole

313

Explosion-proof valve component

3131

Explosion-proof hole

3132

Explosion proof valve

314

Third flange section

315

Second concave section

316

pass section

32

electrode connection

321

Second body section

322

Protruding block

33

First insulating element

331

drilling

332

limiting groove

34

sealing element

341

boundary section

342

convex section

35

Second insulating element

351

First body section

352

Second flange section

353

through hole

354

receiving groove

36

press block

361

First connection section

362

transition section

363

Second connection section

37

Upper pavement

40

fastener

41

First face

42

second face

43

first section

44

second part

441a

head Start

441b

recess

442

First ending

443

second ending

444

First page

445

Second page

45

Third section

46

score

47

Protruding section

48

welding position

481

First concave section

50

filling element

51

main body section

53

First flange section

Claims (14)

An energy storage device (100), characterized by comprising: an end cap component (30) comprising an end cap (31) and an electrode terminal (32), at the end cap (31) an electrode lead-out hole (311) is formed, and the electrode terminal (32) covering the lead-out hole (311) of the electrode; a connecting element (40), wherein on a surface of the connecting element (40) a projection (441a) and wherein a recess (441b) is formed on the other surface, and wherein the projection (441a) is electrically connected to one end of the electrode terminal (32); and a filler (50) filled in the recess (441b), wherein along the axial direction of the lead-out hole of the electrode, the ratio of the projected area of the filler (50) to the projected area of the recess (441b) is greater than or equal to 1.1 and is less than or equal to 1.5, and wherein under the condition of a complete charge and discharge cycle in an environment with a current of 1 C and a temperature of 25 ° C, the number of cycles that the energy storage device (100) is subjected to when the discharge capacity of the energy storage device (100) drops to 80% of the rated capacity is greater than or equal to 2000 and the number of cycles that the energy storage device (100) is subjected to when the discharge capacity of the energy storage device (100) drops to 90% of the rated capacity is greater or equal to 1000. Energy storage device (100) after claim 1 , characterized in that a penetrating hole is formed on a side of the projection (441a) connected to the electrode terminal (32). Energy storage device (100) according to any one of the preceding claims, characterized in that the filling member (50) comprises a main body portion (51) and a first flange portion (53), wherein the first flange portion (53) from a far from the main body portion (51) remote outer peripheral surface protrudes along the radial direction of the lead-out hole (311) of the electrode, and wherein the main body portion (51) is provided in the recess (441b) and is at least partially exposed in the recess (441b), and wherein the first flange portion (53) with the part of the main body portion exposed in the recess (441b), and wherein the main body portion (51) abuts against the side wall of the recess (441b), and wherein the first flange portion (53) covers and abuts the peripheral edge of the recess (441b). The energy storage device (100) according to any one of the preceding claims, characterized in that the first flange portion (53) has a thickness of (0.1 mm, 4.0 mm] along the axial direction of the electrode lead-out hole (311). Energy storage device (100) according to any one of the preceding claims, characterized in that the connecting element (40) comprises a first section (43), a second section (44) and a third section (45), the second section (44) between the first section (43) and the third section (45) is connected, and wherein the first section (43) and the third section (45) are arranged at two opposite ends of the second section (44), and wherein the first Section (43) and the third section (45) are each located on a first side of the second section (44), and wherein the recess (441b) is located on the second section (44), and along the axial direction of the lead-out hole (311 ) of the electrode, the projected area of the filling element (50) is smaller than the projected area of the second section (44). Energy storage device according to any one of the preceding claims, characterized in that along the radial direction of the lead-out hole (311) of the electrode, the difference between the diameter of the filling member (50) and the diameter of the recess (441b) is [0.2mm, 10.0mm]. . Energy storage device (100) according to one of the preceding claims, characterized in that the second section (44) comprises a first end (442) and a second end (443) arranged opposite one another, the first section (43) being connected to the first end (442 ) is connected, and wherein the third section (45) is connected to the second end (443); and wherein a notch (46) is formed on a side of said first end (442) far from said first portion (43) and/or a side of said second end (443) far from said third portion (45), and wherein when the first end (442) and the second end (443) are each provided with the notch (46), along the axial direction of the lead-out hole (311) of the electrode, the notch (46) of the first end (442) and the notch (46) of the second end (443) have different shapes. Energy storage device (100) according to any one of the preceding claims, characterized in that a second side (445) of the second section (44) comprises a protruding section (47), the second side (445) being opposite the first side (444), and where the protruding portion (47) is connected between the first end (442) and the second end (443), and wherein at least part of the projection (441a) is on the protruding portion (47). The energy storage device (100) according to any one of the preceding claims, characterized in that the connecting member (40) comprises a first surface (41) and a second surface (42) which are opposite to each other along the axial direction of the lead-out hole (311) of the electrode , wherein compared to the second surface (42), the first surface (41) is further from the electrode terminal (32), and wherein the first surface (41) is recessed to form the recess (441b), and wherein on the protrusion (441a) is formed in a position of the second surface (42) corresponding to the recess (441b), and wherein the connecting member (40) further forms a welding position (48) located on the second surface (42). Energy storage device (100) according to one of the preceding claims, characterized in that the welding position (48) is provided on the first section (43) and the third section (45). The energy storage device (100) according to any one of the preceding claims, characterized in that the welding position (48) comprises a plurality of first concave portions (481), the first concave portion (481) being formed so as to protrude from the second surface (42). the first surface (41) is recessed, and wherein the depth by which the first concave portion (481) is recessed is less than the thickness of the connecting element (40), and wherein the ratio of the depth by which the first concave Section (481) is depressed to which thickness of the connecting element (40) is in the range of [0.06, 0.19]. Energy storage device (100) according to any one of the preceding claims, characterized in that the end cap component (30) further comprises a first insulating member (33) and a sealing member (34), wherein the first insulating member (33) forms a bore (331), and wherein the first insulating member (33) is connected to the end cap (31), and wherein the bore (331) corresponds to the lead-out hole (311) of the electrode, and wherein along the axial direction of the lead-out hole (311) of the electrode, the protrusion sequentially covers the bore ( 331) and the lead-out hole (311) of the electrode, and the side wall of the projection abuts against the side wall of the bore (331), and the sealing member (34) is provided on a side of the lead-out hole (33) far from the first insulating member (33). 311) of the electrode is fitted and the electrode terminal (32) is abutted against the sealing member (34). Energy storage device (100) according to any one of the preceding claims, characterized in that the sealing member (34) comprises a restricting portion (341) and a convex portion (342), the restricting portion (341) deviating from a far from the connecting member (40). end of the outer peripheral surface of the convex portion (342) along the radial direction of the lead-out hole (311) of the electrode, and wherein the end cap forms a fitting portion along the peripheral edge of the lead-out hole of the electrode, and the restricting portion (341) with the fitting portion (316) fits, and the electrode terminal (32) is abutted against the restricting portion (341), and the convex portion (342) protrudes into the lead-out hole (311) of the electrode, and the convex portion (342) is attached to the side wall of the recess (441b ) is present. Power-consuming device, characterized in that it comprises an energy storage device (100) according to any one of Claims 1 until 13 includes.

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