CN218414964U - End cover assembly, battery and electric equipment - Google Patents

Abstract

The application provides an end cover assembly, a battery pack, a battery and electric equipment, and relates to the technical field of batteries. The end cap assembly comprises a composite end cap, an electrode terminal and a sealing element; the composite end cover is provided with a mounting hole penetrating through the composite end cover, the composite end cover comprises a first end cover and a second end cover which are arranged in a stacked mode along the axial direction of the mounting hole, and the mounting hole penetrates through the first end cover and the second end cover; the electrode terminal is arranged in the mounting hole in a penetrating way; at least part of sealing member is located the mounting hole to the pore wall of mounting hole and at least part of electrode terminal centre gripping sealing member, the sealing member forms radial seal between mounting hole and electrode terminal, and the sealing performance and the sealed reliability of the sealing means of this scheme are better, and the sealing means is simpler, convenient. And the sealing member radially seals the axial sealing mode relative to the sealing member along the mounting hole, so that the axial size of the end cover assembly along the mounting hole can be reduced, and the energy density of a battery pack and a battery with the end cover assembly can be improved.

Description

End cover assembly, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to an end cover assembly, a battery and electric equipment.

Background

At present, a lithium ion battery is generally used as a battery which is used for vehicles, and the lithium ion battery as a rechargeable battery has the advantages of small volume, high energy density, high power density, more recycling times, long storage time and the like.

The battery cell includes an end cap assembly, a case, and an electrode assembly, the end cap covering an opening of the case such that a case accommodating the electrode assembly is formed. The sealing performance of the can is critical to the safety performance of the battery. Therefore, how to improve the sealing performance of the housing is an urgent problem to be solved in the technical field of batteries.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an end cover assembly, a battery and electric equipment, so that the sealing performance of the battery is improved.

In a first aspect, embodiments of the present application provide an end cap assembly comprising a composite end cap, an electrode terminal, and a seal; the composite end cover is provided with a mounting hole penetrating through the composite end cover, the composite end cover comprises a first end cover and a second end cover which are stacked along the axial direction of the mounting hole, the first end cover is used for covering an opening of a first shell and the second end cover is used for covering an opening of a second shell, and the mounting hole penetrates through the first end cover and the second end cover; the electrode terminal penetrates through the mounting hole; at least a portion of the seal is located within the mounting hole, and a hole wall of the mounting hole sandwiches at least a portion of the seal with the electrode terminal.

Among the above-mentioned technical scheme, at least a part of sealing member is located the mounting hole, and the pore wall of mounting hole and the part that electrode terminal centre gripping sealing member is located the mounting hole, then along the radial of mounting hole, the pore wall cooperation compression sealing member of electrode terminal and mounting hole is with sealed electrode terminal and compound end cover, the sealing member forms radial seal between mounting hole and electrode terminal promptly, thereby compare in the sealing member and be compressed in the axial of mounting hole thereby realize sealed first end cover and electrode terminal and/or seal the sealed second end cover and the sealed sealing mode of electrode terminal in the axial of mounting hole, the sealing performance of the sealing mode of this scheme and sealed reliability are better, the sealing mode is simpler, convenient. And the sealing member radially seals the axial sealing mode relative to the sealing member along the mounting hole, so that the axial size of the end cover assembly along the mounting hole can be reduced, and the energy density of a battery pack and a battery with the end cover assembly can be improved.

In some embodiments of the first aspect of the present application, the mounting hole comprises a first mounting hole provided in the first end cap; at least a portion of the seal is located within the first mounting hole, and the hole wall of the first mounting hole and the electrode terminal sandwich the portion of the seal located within the first mounting hole.

In the technical scheme, at least part of the sealing element is positioned in the first mounting hole, and the part of the sealing element positioned in the first mounting hole is clamped by the hole wall of the first mounting hole and the electrode terminal, so that the sealing element forms radial sealing between the first mounting hole and the electrode terminal, and the sealing performance and the sealing reliability are good.

In some embodiments of the first aspect of the present application, the seal member has a first end surface located within the first mounting hole in an axial direction of the mounting hole.

Among the above-mentioned technical scheme, the sealing member is located the first terminal surface of the axial of mounting hole and is located first mounting hole, then along the axial of mounting hole, can have first clearance between the one end of first terminal surface and first mounting hole, this first clearance allows the sealing member to be by the pore wall of first mounting hole and the axial of electrode terminal centre gripping in-process along the mounting hole and takes place deformation to make the pore wall of first mounting hole and electrode terminal can make the sealing member produce sufficient decrement of compression, thereby guarantee the sealing performance between first end cover and the electrode terminal.

In some embodiments of the first aspect of the present application, a dimension of a portion of the seal member located in the first mounting hole in an axial direction of the mounting hole is a, and a dimension of the first mounting hole is b, wherein a/b > 1/2.

In the technical scheme, the axial size of the part, located in the first mounting hole, of the sealing element in the axial direction of the mounting hole is larger than half of the axial size of the first mounting hole, so that the contact area between the sealing element and the hole wall of the first mounting hole is large enough, and the radial sealing performance of the sealing element on the first end cover and the electrode terminal is improved.

In some embodiments of the first aspect of the present application, the mounting hole further comprises a second mounting hole provided in the second end cap; a portion of the seal is located within the first mounting hole, a portion of the seal is located within the second mounting hole, and a hole wall of the second mounting hole and the electrode terminal sandwich the portion of the seal located within the second mounting hole.

Among the above-mentioned technical scheme, a part of sealing member is located first mounting hole to along the radial seal first end cover and the electrode terminal of first mounting hole, a part of sealing member is located the second mounting hole, and along the radial seal electrode terminal and the second end cover of second mounting hole, make the sealing performance between first end cover and the electrode terminal better and the sealing reliability higher, and the sealing performance between second end cover and the electrode terminal better and the sealing reliability higher, thereby improve the sealing performance of end cover subassembly.

In some embodiments of the first aspect of the present application, the seal has a second end face located within the second mounting hole in an axial direction of the mounting hole.

In the above technical solution, the second end face of the sealing element in the axial direction of the mounting hole is located in the second mounting hole, and then along the axial direction of the mounting hole, a second gap exists between the second end face and one end of the second mounting hole, and the second gap allows the sealing element to be deformed along the axial direction of the mounting hole in the process of being clamped by the hole wall of the second mounting hole and the electrode terminal, so that the hole wall of the second mounting hole and the electrode terminal can enable the sealing element to generate sufficient compression, thereby ensuring the sealing performance between the second end cap and the electrode terminal.

In some embodiments of the first aspect of the present application, a dimension of a portion of the seal member located within the second mounting hole in an axial direction of the mounting hole is h, and a dimension of the second mounting hole is k, wherein h/k > 1/2.

In the technical scheme, the axial size of the part, located in the second mounting hole, of the sealing element in the axial direction of the mounting hole is larger than half of the axial size of the second mounting hole, so that the contact area between the sealing element and the hole wall of the second mounting hole is large enough, and the radial sealing performance of the sealing element on the second end cover and the electrode terminal is improved.

In some embodiments of the first aspect of the present application, the dimension of the first mounting hole in the axial direction thereof is b, b ≧ 0.5mm; and/or the second mounting hole has a dimension k along the axial direction, wherein k is more than or equal to 0.5mm.

In the technical scheme, the dimension b of the first mounting hole along the axial direction is more than or equal to 0.5mm, so that the first mounting hole has enough area along the axial direction to be in contact with the sealing element, and the sealing performance of the sealing element between the hole wall of the first mounting hole and the electrode terminal is ensured; the dimension k of the second mounting hole along the axial direction is more than or equal to 0.5mm, so that the second mounting hole has enough area along the axial direction to be in contact with the sealing element, and the sealing performance of the sealing element between the hole wall of the second mounting hole and the electrode terminal is ensured.

In some embodiments of the first aspect of the present application, 1.2 mm. Ltoreq. B.ltoreq.2.5 mm; and/or k is more than or equal to 1.2mm and less than or equal to 2.5mm.

In the technical scheme, the dimension b of the first mounting hole along the axial direction meets the requirement that b is more than or equal to 1.2mm and less than or equal to 2.5mm, so that the first mounting hole can be ensured to have enough area to be contacted with the sealing element along the axial direction, the sealing performance of the sealing element between the hole wall of the first mounting hole and the electrode terminal can be ensured, the dimension of the first end cover along the axial direction of the first mounting hole can be controlled within a reasonable range, and the overlarge dimension of the end cover assembly along the axial direction of the first mounting hole can be avoided; and/or the axial size k of the second mounting hole satisfies that k is more than or equal to 1.2mm and less than or equal to 2.5mm, so that the second mounting hole can be ensured to have enough area to be contacted with the sealing element along the axial direction, the sealing performance of the sealing element between the hole wall of the second mounting hole and the electrode terminal can be ensured, the axial size of the second end cover along the second mounting hole can be controlled within a reasonable range, and the axial size of the end cover assembly along the second mounting hole can be prevented from being too large.

In some embodiments of the first aspect of the present application, the sealing member includes a body portion and a position-limiting portion, the position-limiting portion is protruded from an outer peripheral surface of the body portion, and the position-limiting portion extends at least partially between the first end cover and the second end cover in a radial direction of the mounting hole.

Among the above-mentioned technical scheme, spacing portion is used for spacing to this somatic part along the axial of mounting hole to reduce the sealing member in the ascending amount of movement of the axial of mounting hole or avoid the sealing member along the axial displacement of mounting hole, thereby reduce the risk of sealed inefficacy.

In some embodiments of the first aspect of the present application, the position-limiting portion continuously surrounds the outer periphery of the body portion.

Among the above-mentioned technical scheme, spacing portion is continuous to surround in the periphery of this somatic part, can be in the circumference of this somatic part upwards spacing to this somatic part in the axial of mounting hole in optional position, improves the stability of the relative first end cover of sealing member, second end cover and electrode terminal, reduces the risk of sealed inefficacy.

In some embodiments of the first aspect of the present application, the first end cover and the second end cover sandwich the stopper portion in an axial direction of the mounting hole.

Among the above-mentioned technical scheme, spacing portion is held by first end cover and second end cover clamp, then the sealing member can not follow the axial displacement of mounting hole to reduce the risk of sealed inefficacy.

In some embodiments of the first aspect of the present application, the composite end cap further comprises a first insulator disposed between the first end cap and the second end cap in a stacked manner in an axial direction of the mounting hole, the mounting hole penetrating the first end cap, the second end cap, and the first insulator; the mounting hole further comprises a third mounting hole formed in the first insulating member.

Among the above-mentioned technical scheme, the setting of first insulating part can avoid leading to the group battery and the battery short circuit that possess this end cover subassembly because of first end cover and second end cover contact, improves the security that possesses the group battery and the battery of this end cover subassembly.

In some embodiments of the first aspect of the present application, the sealing member includes a body portion and a position-limiting portion, the position-limiting portion is protruded from an outer peripheral surface of the body portion, the position-limiting portion extends at least partially between the first end cover and the second end cover in a radial direction of the mounting hole, and the position-limiting portion is located in the third mounting hole.

Among the above-mentioned technical scheme, spacing portion is located the third mounting hole and extends to between first end cover and the second end cover along the radial of mounting hole, and spacing portion can be spacing to this axial of this somatic part edge mounting hole to reduce the sealing member at the ascending displacement of axial of mounting hole or avoid the sealing member to follow the axial displacement of mounting hole, thereby reduce the risk of sealed inefficacy.

In some embodiments of the first aspect of the present application, the third mounting hole has a larger diameter than the first mounting hole, the third mounting hole has a larger diameter than the second mounting hole, and the limiting portion protrudes from the hole wall of the first mounting hole and the hole wall of the second mounting hole along the radial direction of the mounting holes.

Among the above-mentioned technical scheme, spacing portion along the radial protrusion in the pore wall of first mounting hole and the pore wall of second mounting hole of mounting hole, consequently, along the axial of mounting hole, the both ends of spacing portion can offset with first end cover and second end cover respectively to play limiting displacement to the sealing member in the axial of mounting hole, thereby reduce the risk of sealed inefficacy.

In some embodiments of the first aspect of the present application, a minimum thickness of a portion of the seal member located in the mounting hole in a radial direction of the mounting hole is e, and 0.5mm ≦ e ≦ 3mm is satisfied.

In the technical scheme, the minimum thickness e of the part of the sealing element, which is positioned in the mounting hole, meets the requirement that e is more than or equal to 0.5mm and less than or equal to 3mm, and is convenient for controlling the radial compression amount of the sealing element along the mounting hole, thereby being beneficial to improving the sealing stability.

In some embodiments of the first aspect of the present application, the electrode terminal includes a terminal body, the terminal body is disposed through the mounting hole, and the sealing member is disposed at an outer periphery of the terminal body.

Among the above-mentioned technical scheme, the mounting hole is worn to locate by the terminal body to make compound end cover and electrode terminals form the location cooperation, improve electrode terminals, first end cover and second end cover three relative stability. The periphery of terminal body is located to the sealing member cover, can form location fit with electrode terminal, improves the installation stability to play stable sealed effect.

In some embodiments of the first aspect of the present application, the electrode terminal further includes a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion both protrude from the outer periphery of the terminal body, the first connecting portion is disposed on a side of the first end cap deviating from the second end cap, and the second connecting portion is disposed on a side of the second end cap deviating from the first end cap.

Among the above-mentioned technical scheme, first connecting portion and second connecting portion all with this body coupling of terminal, and lie in one side that first end cover deviates from the second end cover and one side that the second end cover deviates from first end cover respectively, can play limiting displacement to make the structure of end cover subassembly more compact and can improve the stability of end cover subassembly structure.

In some embodiments of the first aspect of the present application, the composite end cap further comprises a second insulator and a third insulator, at least a portion of the second insulator being located between the third connector and the first end cap to insulate and isolate the first connector from the first end cap, and at least a portion of the third insulator being located between the second connector and the second end cap to insulate and isolate the second connector from the second end cap.

Among the above-mentioned technical scheme, the setting of second insulating part and third insulating part can reduce the battery pack that possesses this end cover assembly and the risk of battery short circuit.

In a second aspect, embodiments of the present application further provide a battery assembly, including a first housing, a second housing, and an end cap assembly provided in any of the embodiments of the first aspect; the first case for accommodating a first electrode assembly; the second case is used for accommodating a second electrode assembly; the first end cap covers the opening of the first case, the second end cap covers the opening of the second case, and the electrode terminals are used to electrically connect the first electrode assembly and the second electrode assembly.

In the above technical solution, the end cap assembly provided in the embodiment of the first aspect has good sealing performance, so that the battery assembly having the end cap assembly has good sealing performance, and the risk of leakage of the battery assembly from the end cap assembly is reduced.

In a third aspect, embodiments of the present application provide a battery, including the battery assembly provided in the second aspect.

In a fourth aspect, an embodiment of the present application provides an electric device, including the battery provided in the embodiment of the third aspect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural view of a battery pack according to the prior art;

FIG. 2 is a cross-sectional view of a prior art end cap assembly;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 5 is a schematic structural diagram of a battery provided in some embodiments of the present application;

fig. 6 is a schematic structural diagram of a battery assembly provided in some embodiments of the present application;

fig. 7 is an exploded view of a battery assembly provided by some embodiments of the present application;

FIG. 8 is an exploded view of an end cap assembly provided by some embodiments of the present application;

FIG. 9 is a schematic structural view of an end cap assembly provided in accordance with some embodiments of the present application;

FIG. 10 is a cross-sectional view of an end cap assembly provided by some embodiments of the present application;

FIG. 11 is a cross-sectional view taken at B of FIG. 10;

FIG. 12 is a cross-sectional view of an end cap assembly according to other embodiments of the present application;

FIG. 13 is an enlarged view at C of FIG. 12;

FIG. 14 is a cross-sectional view of an end cap assembly provided in accordance with still other embodiments of the present application;

FIG. 15 is an enlarged view at D of FIG. 14;

FIG. 16 is a cross-sectional view of an end cap assembly provided in accordance with further embodiments of the present application;

FIG. 17 is an enlarged view at E in FIG. 16;

FIG. 18 is a cross-sectional view of an end cap assembly provided in accordance with further embodiments of the present application;

FIG. 19 is an enlarged view at F of FIG. 18;

FIG. 20 is a cross-sectional view of an end cap assembly provided in accordance with still other embodiments of the present application;

FIG. 21 is an enlarged view at G of FIG. 20;

FIG. 22 is a schematic structural view of a seal provided by some embodiments of the present application;

FIG. 23 is a schematic view of a seal according to further embodiments of the present application;

FIG. 24 is a schematic structural view of a seal provided in accordance with still further embodiments of the present application;

FIG. 25 is a schematic structural view of an electrode terminal provided in some embodiments of the present application;

FIG. 26 is a schematic view of a first insulator according to some embodiments of the present disclosure;

fig. 27 is a schematic structural view of a second insulating member according to some embodiments of the present application.

An icon: 1000-a vehicle; 100-a battery; 10-a box body; 11-a first box; 12-a second box; 20', 20-battery assembly; 21', 21-a first housing; 211 — a first opening; 22', 22-a second housing; 221-a second opening; 23', 23-first electrode assembly; 231-positive tab; 24', 24 — a second electrode assembly; 241-negative tab; 25', 25-end cap assembly; 250-a composite end cap; 2500-mounting holes; 251', 251-first end cap; 2511-a first mounting hole; 2512-a first surface; 2513-a third surface; 252', 252 — a second end cap; 2521-a second mounting hole; 2522-a second surface; 2523-a fourth surface; 253', 253-electrode terminals; 2531', 2531-terminal body; 25311-first stage; 25312-second section; 25313 — a first body portion; 25314 — first nest; 25315-a second body portion; 25316-a second nesting portion; 2532', 2532 — first connection; 2533', 2533-second connection; 2534-first recess; 2535-a second recess; 254', 254-seals; 2541-first end face; 2542-third end face; 2543-a second end face; 2544-first part; 2545-second part; 2546-a fourth end face; 2547-body portion; 2548-a limiting part; 25481-first face; 25482-second face; 25483-limit blocks; 255-a first gap; 256-second gap; 257', 257 — a first insulator; 2571-third mounting hole; 258', 258-second insulator; 2581 — first insulation; 2582-second insulation; 2583-first receptacle; 259', 259 — third insulation; 2591-third insulation; 2592-fourth insulation; 2593-a second receptacle; 260-third gap; 200-a controller; 300-a motor; x-a first direction; y-axial direction of the mounting hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it should be noted that the indication of orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, or the orientation or positional relationship which is conventionally understood by those skilled in the art, is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, and other performance parameters, and also needs to consider the sealing performance of the battery. When the battery is used, the requirement on the sealing property is extremely high, and if the sealing property of the battery is poor, water vapor can permeate into the battery and generate side reaction with electrolyte, so that the performance of the battery is influenced, and the service life of the battery is shortened. The electrolyte may also flow out, corroding the battery lines and affecting electrical safety.

The inventor has noted that, in order to increase the voltage of the battery, a plurality of battery cells may be connected in series through the bus member, in which case, the positive transport electrode (the positive electrode terminal of one of the battery cells) and the negative transport electrode (the negative electrode terminal of one of the battery cells) of the battery may be connected by leading out two wires from the outside of the battery, respectively, and the collecting circuit board is matched to perform the related information (such as voltage information) of the battery. The serial bus-bar part occupies a large space, so that the energy density of the battery is low.

In order to alleviate the problem of low energy density of the battery, the applicant researches and discovers that the series connection mode of a plurality of battery units of the battery can be improved, a bus bar part is not needed to be arranged, and two electrode assemblies share an electrode terminal, so that the two electrode assemblies are electrically connected, and a battery assembly in series connection is formed. Specifically, as shown in fig. 1 to 3, the battery assembly 20 includes a first case 21', a second case 22', a first electrode assembly 23', a second electrode assembly 24', and an end cap assembly 25'. The end cap assembly 25 'includes a first end cap 251', a second end cap 252', an electrode terminal 253', a sealing member 254', a first insulating member 257', a second insulating member 258', and a third insulating member 259'. The electrode terminal 253 'includes a terminal body 2531', a first connection portion 2532', and a second connection portion 2533'. The second insulating member 258', the first end cap 251', the first insulating member 257', the second end cap 252', and the third insulating member 259' are sequentially stacked in the first direction X. The first end cap 251 'and the second end cap 252' are used to cover the opening of the first housing 21 'and the opening of the second housing 22', respectively. The first connection portion 2532' and the second connection portion 2533' are connected to the terminal body 2531', and the terminal body 2531' is inserted into the second insulating member 258', the first end cap 251', the first insulating member 257', the second end cap 252', and the third insulating member 259'. The first connecting portion 2532 'is located on a side of the second insulating member 258' facing away from the first end cap 251', the second insulating member 258' insulates and separates the first connecting portion 2532 'and the first end cap 251', the second connecting portion 2533 'is located on a side of the third insulating member 259' facing away from the first end cap 251', and the third insulating member 259' insulates and separates the second connecting portion 2533 'and the second end cap 252'. In the first direction X, the first connection portion 2532 'and the first end cap 251' together compress a portion of the sealing member 254 'between the first connection portion 2532' and the first end cap 251 'such that the portion of the sealing member 254' is sealed between the first connection portion 2532 'and the first end cap 251' in the first direction X. The second connection portion 2533' and the second end cap 252' collectively compress a portion of the sealing member 254' between the second connection portion 2533' and the second end cap 252' in the first direction X, such that the portion of the sealing member 254' is sealed between the second connection portion 2533' and the second end cap 252' in the first direction X, which may be understood as the sealing member 254' seals the first end cap 251' and the electrode terminal 253' in the stacking direction of the first end cap 251' and the second end cap 252', and seals the second end cap 252' and the electrode terminal 253'.

This sealing method not only complicates assembly and has poor sealing performance and sealing reliability, but also increases the size of the electrode assembly in the first direction X, resulting in a lower energy density of the battery pack and the battery having the end cap assembly 25'.

Based on the above consideration, in order to alleviate the problem of poor sealing reliability of the end cap assembly, the inventor has conducted intensive research and designs an end cap assembly, wherein the end cap assembly comprises a composite end cap, an electrode terminal and a sealing member, the composite end cap is provided with a mounting hole penetrating through the composite end cap, the composite end cap comprises a first end cap and a second end cap which are stacked in the axial direction of the mounting hole, the mounting hole penetrates through the first end cap and the second end cap, and the electrode terminal penetrates through the mounting hole; at least a portion of the seal is located within the mounting hole, and a hole wall of the mounting hole sandwiches at least a portion of the seal with the electrode terminal.

At least one part of sealing member is located the mounting hole, and the pore wall of mounting hole and the part that electrode terminal centre gripping sealing member is located the mounting hole, then along the radial of mounting hole, the pore wall cooperation compression sealing member of electrode terminal and mounting hole is with sealed electrode terminal and compound end cover, the sealing member forms radial seal between mounting hole and electrode terminal promptly, thereby compare in the sealing member and be compressed in the axial of mounting hole thereby realize sealed first end cover and electrode terminal and/or seal the sealed second end cover and the sealed sealing mode of electrode terminal in the axial of mounting hole, the sealing performance of the sealing mode of this scheme and sealed reliability are better, sealing mode is simpler, convenient.

And the sealing member radially seals the axial sealing mode relative to the sealing member along the mounting hole, so that the axial size of the end cover assembly along the mounting hole can be reduced, and the energy density of a battery pack and a battery with the end cover assembly can be improved.

The end cover assembly disclosed in the embodiment of the application can be used in a battery assembly or a battery with the end cover assembly, and can also be used in electric equipment of a power supply system formed by the battery assembly or the battery with the end cover assembly, so that the relevant information of the battery can be conveniently acquired, and the electricity utilization condition of the electric equipment can be conveniently monitored.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

For convenience of description, the following embodiments are described by taking an electric device of an embodiment of the present application as an example of a vehicle 1000.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 5, fig. 5 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 10 and at least one battery pack 20, and the battery pack 20 is accommodated in the case 10. Wherein the case 10 is used to provide a receiving space for the battery assembly 20, and the case 10 may take various structures. In some embodiments, the case 10 may include a first case 11 and a second case 12, the first case 11 and the second case 12 cover each other, and the first case 11 and the second case 12 together define a receiving space for receiving the battery assembly 20. The second case 12 may be a hollow structure having an opening at one end to form a receiving cavity for receiving the battery assembly 20, the first case 11 may be a plate-shaped structure, and the first case 11 covers the opening side of the second case 12, so that the first case 11 and the second case 12 together define a receiving space; the first case 11 and the second case 12 may be both hollow structures having one side opened to form a receiving cavity for receiving the battery assembly 20, and the opening side of the first case 11 is covered on the opening side of the second case 12. Of course, the case 10 formed by the first case 11 and the second case 12 may have various shapes, for example, a cylindrical shape, a rectangular parallelepiped shape, etc.

As shown in fig. 6 and 7, the battery assembly 20 includes a first case 21, a second case 22, a first electrode assembly 23, a second electrode assembly 24, and an end cap assembly 25.

The first case 21 has a first opening 211, the second case 22 has a second opening 221, the cap assembly 25 covers the first opening 211 and the second opening 221, the cap assembly 25 and the first case 21 define a space for accommodating the first electrode assembly 23, and the cap assembly 25 and the second case 22 define a space for accommodating the second electrode assembly 24.

The first and second housings 21 and 22 may be various shapes and various sizes, such as a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shapes of the first case 21 and the second case 22 may be determined according to the specific shape and size of the electrode assembly. The first housing 21 and the second housing 22 may be identical in shape or different in shape. The material of the first housing 21 and the second housing 22 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present invention is not limited thereto.

The first electrode assembly 23 and the second electrode assembly 24 are each composed of a positive electrode tab (not shown), a negative electrode tab (not shown), and a separator (not shown). The battery assembly 20 operates by primarily relying on metal ions to move between the positive and negative plates. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the positive current collector which is not coated with the positive active substance layer protrudes out of the positive current collector which is coated with the positive active substance layer, and the positive current collector which is not coated with the positive active substance layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the negative pole mass flow body protrusion in the negative pole mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer, and the negative pole mass flow body of not scribbling the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse can not be fused by large current, a plurality of positive electrode lugs are laminated together, and a plurality of negative electrode lugs are laminated together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the first electrode assembly 23 and the second electrode assembly 24 may be a winding type structure, or may be a lamination type structure; one of the first electrode assemblies 23 may be a winding type structure, and the other may be a lamination type structure. The embodiments of the present application are not limited thereto.

The end cap assembly 25 is used to electrically connect the first electrode assembly 23 and the second electrode assembly 24. Wherein, the positive electrode tab 231 of the first electrode assembly 23 and the negative electrode tab 241 of the second electrode assembly 24 are electrically connected through the end cap assembly 25 to realize the electrical connection of the first electrode assembly 23 and the second electrode assembly 24; the negative electrode tab of the first electrode assembly 23 and the positive electrode tab of the second electrode assembly 24 may be electrically connected through the end cap assembly 25 to electrically connect the first electrode assembly 23 and the second electrode assembly 24; the negative electrode tab of the first electrode assembly 23 and the negative electrode tab of the second electrode assembly 24 may be electrically connected through the end cap assembly 25 to electrically connect the first electrode assembly 23 and the second electrode assembly 24.

The battery assembly 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The first electrode assembly 23 and the second electrode assembly 24 may be cylindrical, flat, rectangular parallelepiped, or other shapes, etc. The first and second housings 21 and 22 may be cylindrical, flat, rectangular parallelepiped, or other shapes.

As shown in fig. 8-11, the end cap assembly 25 includes a composite end cap 250, an electrode terminal 253, and a seal 254; the composite end cover 250 is provided with a mounting hole 2500 penetrating through the composite end cover 250, the composite end cover 250 comprises a first end cover 251 and a second end cover 252 which are arranged in a stacking mode along the axial direction Y of the mounting hole, the first end cover 251 is used for covering an opening of the first shell 21, the second end cover 252 is used for covering an opening of the second shell 22, and the mounting hole 2500 penetrates through the first end cover 251 and the second end cover 252; the electrode terminal 253 is inserted into the mounting hole 2500; at least a portion of the seal 254 is positioned within the mounting hole 2500, and the hole wall of the mounting hole 2500 and the electrode terminal 253 sandwich at least a portion of the seal 254.

The opening of the first housing 21 is a first opening 211, and the opening of the second housing 22 is a second opening 221. The first cap 251 covers the first opening 211, and the first cap 251 and the first case 21 together define a first space in which the first electrode assembly 23 is accommodated. The second end cap 252 covers the second opening 221, and the second end cap 252 and the second case 22 together define a second space in which the second electrode assembly 24 is accommodated. The first and second spaces may also contain electrolyte and other components.

Without limitation, the shape of the first end cap 251 may be adapted to the shape of the first housing 21 or the first opening 211 of the first housing 21 to fit the first housing 21, and the shape of the second end cap 252 may be adapted to the shape of the second housing 22 or the second opening 221 of the second housing 22 to fit the second housing 22. Alternatively, the first end cap 251 and the second end cap 252 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the first end cap 251 and the second end cap 252 are not easily deformed when being impacted by the extrusion, and the battery assembly 20 may have a higher structural strength and improved safety performance.

The first end cap 251 and the second end cap 252 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present embodiment is not limited thereto.

The first end cap 251 and the second end cap 252 may be insulated to reduce short circuiting of the cell assembly 20 or the cell 100 due to contact between the first end cap 251 and the second end cap 252. The first end cover 251 and the second end cover 252 can be insulated and separated by arranging an insulating piece between the first end cover 251 and the second end cover 252; it is also possible that the first end cap 251 and/or the second end cap 252 are made of insulating material, so as to achieve the insulating separation between the first end cap 251 and the second end cap 252.

Seal 254 is plastic, rubber, or the like. The seal 254 may be positioned within the mounting hole 2500 along only a portion thereof, with another portion extending outside of the mounting hole 2500. The seal 254 may also be located entirely within the mounting aperture 2500. The portion of the seal 254 located in the mounting hole 2500 may be fully sealed or only partially sealed.

At least a portion of the sealing member 254 is located in the mounting hole 2500, and the wall of the mounting hole 2500 and the electrode terminal 253 clamp the portion of the sealing member 254 located in the mounting hole 2500, then along the radial direction of the mounting hole 2500, the electrode terminal 253 and the wall of the mounting hole 2500 cooperate to compress the sealing member 254 to seal the electrode terminal 253 and the first end cap 251, that is, the sealing member 254 forms a radial seal between the mounting hole 2500 and the electrode terminal 253, compared to a sealing manner in which the sealing member 254 is compressed in the axial direction Y of the mounting hole to seal the first end cap 251 and the electrode terminal 253 in the axial direction Y of the mounting hole and/or seal the second end cap 252 and the electrode terminal 253 in the axial direction Y of the mounting hole. And the sealing member 254 radially seals against the sealing member 254 in the axial direction Y of the mounting hole, the size of the end cap assembly 25 in the axial direction Y of the mounting hole can be reduced, which is advantageous for improving the energy density of the battery 100 and the battery 100 provided with the end cap assembly 25.

As shown in fig. 11-17, in some embodiments, the mounting holes 2500 include a first mounting hole 2511 provided in the first end cap 251; at least a portion of the seal 254 is positioned within the first mounting hole 2511, and the hole wall of the first mounting hole 2511 and the electrode terminal 253 grip the portion of the seal 254 positioned within the first mounting hole 2511.

The seal 254 may be located entirely within the first mounting hole 2511. The seal 254 may be only partially positioned within the first mounting hole 2511 and another portion may extend out of the first mounting hole 2511 and out of the mounting hole 2500. The seal 254 may also be partially positioned in the first mounting hole 2511 and partially extend to other locations in the mounting hole 2500.

As shown in fig. 11, 12, and 13, the seal 254 may be entirely located within the first mounting hole 2511. As shown in fig. 14-17, the seal 254 may be positioned within the first mounting bore 2511 along a portion of the axial direction Y of the mounting bore.

At least a part of the sealing member 254 is located in the first mounting hole 2511, and a part of the sealing member 254 located in the first mounting hole 2511 is clamped by the hole wall of the first mounting hole 2511 and the electrode terminal 253, so that the sealing member 254 forms a radial seal between the first mounting hole 2511 and the electrode terminal 253, the sealing performance is good, the sealing reliability is high, and the risk of leakage of liquid from the first mounting hole 2511 in the first space formed by the first end cover 251 and the first housing 21 can be reduced.

As shown in fig. 11 and 13, in some embodiments, the seal 254 has a first end surface 2541 along the axial direction Y of the mounting bore, the first end surface 2541 being located within the first mounting bore 2511.

Along the axial direction Y of the mounting hole, the first end cap 251 has a first surface 2512 facing away from the second end cap 252, the first end surface 2541 is the surface of the seal 254 located in the first mounting hole 2511 and facing away from the second end cap 252, and the first end surface 2541 is closer to the second end cap 252 than the first surface 2512.

The first end surface 2541 is closer to the second end cap 252 than the first surface 2512, and the first end surface 2541 is located in the first mounting hole 2511, a first gap 255 is formed between the first end surface 2541 and the first surface 2512 along the axial direction Y of the mounting hole, and when the hole wall of the first mounting hole 2511 and the electrode terminal 253 cooperate to compress the sealing member 254, the first gap 255 allows the sealing member 254 to be deformed along the axial direction Y of the mounting hole during clamping by the hole wall of the first mounting hole 2511 and the electrode terminal 253, so that the hole wall of the first mounting hole 2511 and the electrode terminal 253 can generate a sufficient amount of compression on the sealing member 254, thereby ensuring the sealing performance between the first end cap 251 and the electrode terminal 253.

The first end cap 251 also has a third surface 2513, the third surface 2513 being disposed opposite the first surface 2512 in the axial direction Y of the mounting hole. The seal 254 also has a third end surface 2542, and the third end surface 2542 is arranged opposite to the first end surface 2541 in the axial direction Y of the mounting hole. As shown in fig. 11, third end surface 2542 can be coplanar with third surface 2513. In other embodiments, as shown in fig. 13 and 15, third end surface 2542 and third surface 2513 may also be non-coplanar, i.e.: as shown in fig. 13, the third end surface 2542 is closer to the first surface 2512 than the third end surface 2513 along the axial direction Y of the mounting hole, so that the third end surface 2542 is located in the first mounting hole 2511, and a gap is formed between the third end surface 2542 and the third end surface 2513 along the axial direction Y of the mounting hole, and when the hole wall of the first mounting hole 2511 and the electrode terminal 253 cooperate to compress the sealing member 254, the gap allows the sealing member 254 to deform along the axial direction Y of the mounting hole, so that the hole wall of the first mounting hole 2511 and the electrode terminal 253 can generate a sufficient amount of compression on the sealing member 254, thereby ensuring the sealing performance between the first end cap 251 and the electrode terminal 253, in which case the sealing member 254 is located in the first mounting hole 2511; alternatively, as shown in FIG. 15, the third end surface 2542 is further from the first surface 2512 than the third surface 2513 along the axial direction Y of the mounting hole, i.e., the seal 254 extends out of the first mounting hole 2511 in a direction close to the second end cap 252, in which case a portion of the seal 254 is located within the first mounting hole 2511.

In other embodiments, both ends of the seal 254 in the axial direction Y of the mounting hole may extend out of the first mounting hole 2511.

As shown in FIGS. 11, 13, 15, 17, in some embodiments, the portion of the seal 254 that is located within the first mounting hole 2511 has a dimension a and the first mounting hole 2511 has a dimension b in the axial direction Y of the mounting hole, where a/b > 1/2.

As shown in fig. 11 and 13, in the embodiment in which the seal 254 is entirely located in the first mounting hole 2511, the "dimension a" of the portion of the seal 254 located in the first mounting hole 2511 refers to the distance between the first end surface 2541 and the third end surface 2542 in the axial direction Y of the mounting hole.

As shown in fig. 15 and 17, in embodiments where a portion of the seal 254 is positioned within the first mounting bore 2511 and the first end surface 2541 is positioned within the first mounting bore 2511, the "dimension a" of the portion of the seal 254 positioned within the first mounting bore 2511 "refers to the distance between the first end surface 2541 and the third surface 2513 in the axial direction Y of the mounting bore.

In this embodiment, the first mounting hole 2511 extends through the first surface 2512 and the third surface 2513 of the first end cap 251. "dimension b" of the first mounting hole 2511 refers to the distance between the first surface 2512 and the third surface 2513 in the axial direction Y of the mounting hole.

The dimension a of the portion of the seal 254 located within the first mounting hole 2511 and the dimension b of the first mounting hole 2511 satisfy: a/b > 1/2, that is, the dimension of the portion of the sealing member 254 located in the first mounting hole 2511 in the axial direction Y of the mounting hole is greater than half the axial dimension of the first mounting hole 2511, so that the contact area of the sealing member 254 and the hole wall of the first mounting hole 2511 is large enough to improve the radial sealing performance of the sealing member 254 against the first end cap 251 and the electrode terminal 253.

As shown in fig. 17, 18, and 19, in some embodiments, the mounting hole 2500 further includes a second mounting hole 2521 provided in the second end cap 252; portions of the seal 254 are located within the first mounting hole 2511, portions of the seal 254 are located within the second mounting hole 2521, and the hole wall of the second mounting hole 2521 and the electrode terminal 253 clamp the portion of the seal 254 located within the second mounting hole 2521.

The portion of the seal 254 that is positioned within the second mounting bore 2521 and the portion of the seal 254 that is positioned within the first mounting bore 2511 may be in a connected state or may be unconnected and independent of each other. Fig. 17 shows a state in which a portion of the seal 254 located inside the second mounting hole 2521 is connected to a portion of the seal 254 located in the first mounting hole 2511. Fig. 19 shows a state in which a portion of the seal 254 located in the second mounting hole 2521 and a portion of the seal 254 located in the first mounting hole 2511 are not connected and are independent of each other.

The electrode terminal 253 includes a terminal body 2531 inserted into the first mounting hole 2511 and the second mounting hole 2521. The portion of the seal 254 located within the first mounting hole 2511 is compressed by the mating of the hole wall of the first mounting hole 2511 and the outer circumferential surface of the terminal body 2531 in the radial direction of the first mounting hole 2511, so that the seal 254 radially seals the electrode terminal 253 and the first end cap 251. After being compressed, the portion of the seal 254 that is located within the first mounting bore 2511 has a smaller radial dimension along the first mounting bore 2511 than before the seal 254 is located within the first mounting bore 2511.

The portion of the seal 254 within the second mounting bore 2521 is compressed by the bore wall of the second mounting bore 2521 and the outer peripheral surface of the terminal body 2531 in a radial fit along the second mounting bore 2521 to effect the seal 254 to radially seal the electrode terminal 253 and the second end cap 252. When compressed, the portion of the seal 254 that is disposed within the second mounting bore 2521 has a smaller radial dimension along the second mounting bore 2521 than the radial dimension of the seal 254 prior to being disposed within the second mounting bore 2521.

A portion of the sealing member 254 is positioned in the first mounting hole 2511 to seal the first end cap 251 and the electrode terminal 253 in a radial direction of the first mounting hole 2511, and a portion of the sealing member 254 is positioned in the second mounting hole 2521 to seal the electrode terminal 253 and the second end cap 252 in the radial direction of the second mounting hole 2521, so that the sealing performance and the sealing reliability between the first end cap 251 and the electrode terminal 253 are good, and the sealing performance and the sealing reliability between the second end cap 252 and the electrode terminal 253 are good, thereby improving the sealing performance of the end cap assembly 25.

In some embodiments, the seal 254 has a second end surface 2543 along the axial direction Y of the mounting bore, the second end surface 2543 being located within the second mounting bore 2521.

The second end cap 252 has a second surface 2522 facing away from the first end cap 251, the second end surface 2543 is a sealing member 254 having a surface located in the second mounting hole 2521 and facing away from the first end cap 251, and the second end surface 2543 is closer to the first end cap 251 than the second surface 2522.

The second end surface 2543 is closer to the first end cap 251 than the second surface 2522, and the second end surface 2543 is located in the second mounting hole 2521, so that a second gap 256 is formed between the second end surface 2543 and the second surface 2522 along the axial direction Y of the mounting hole, and when the hole wall of the second mounting hole 2521 and the electrode terminal 253 are matched to compress the sealing member 254, the second gap 256 allows the sealing member 254 to be deformed along the axial direction Y of the mounting hole during the process of being clamped by the hole wall of the second mounting hole 2521 and the electrode terminal 253, so that the hole wall of the second mounting hole 2521 and the electrode terminal 253 can generate a sufficient amount of compression on the sealing member 254, thereby ensuring the sealing performance between the second end cap 252 and the electrode terminal 253.

The second end cap 252 also has a fourth surface 2523, and the fourth surface 2523 is disposed opposite the second surface 2522 in the axial direction Y of the mounting hole.

As shown in fig. 19, in an embodiment in which the portion of the seal 254 located in the second mounting hole 2521 and the portion of the seal 254 located in the first mounting hole 2511 are independent of each other, the portion where the seal 254 is mounted in the first mounting hole 2511 is defined as a first portion 2544, and the first end surface 2541 and the third end surface 2542 are respectively two end surfaces of the first portion 2544 that are opposite in the axial direction Y of the mounting hole. The portion defining the sealing member 254 mounted in the second mounting hole 2521 is a second portion 2545, the second end surface 2543 is one end surface of the second portion 2545, and the second portion 2545 further has a fourth end surface 2546, the fourth end surface 2546 being arranged opposite to the second end surface 2543 in the axial direction Y of the mounting hole. The fourth end surface 2546 can be coplanar with the fourth surface 2523. In other embodiments, fourth end surface 2546 and fourth surface 2523 may also be non-coplanar, i.e.: when the fourth end surface 2546 is closer to the second surface 2522 than the fourth surface 2523 along the axial direction Y of the mounting hole, the fourth end surface 2546 is located in the second mounting hole 2521, and a gap is formed between the fourth end surface 2546 and the fourth surface 2523 along the axial direction Y of the mounting hole, and when the hole wall of the second mounting hole 2521 and the electrode terminal 253 are engaged to compress the sealing member 254, the gap allows the sealing member 254 to be deformed along the axial direction Y of the mounting hole during the process of being clamped by the hole wall of the second mounting hole 2521 and the electrode terminal 253, so that the hole wall of the second mounting hole 2521 and the electrode terminal 253 can generate a sufficient amount of compression on the sealing member 254, thereby ensuring the sealing performance between the second end cap 252 and the electrode terminal 253; alternatively, the fourth end surface 2546 is farther from the second surface 2522 than the fourth surface 2523 along the axial direction Y of the mounting hole, i.e., the sealing member 254 extends out of the second mounting hole 2521 in a direction close to the first end cap 251. Fig. 19 illustrates that the fourth end surface 2546 and the fourth surface 2523 may be coplanar.

In other embodiments, both ends of the second portion 2545 in the axial direction Y of the mounting hole may extend out of the second mounting hole 2521.

As shown in FIGS. 17 and 19, in some embodiments, the portion of the seal 254 that is located within the second mounting hole 2521 along the axial direction Y of the mounting hole has a dimension h, and the second mounting hole 2521 has a dimension k, wherein h/k > 1/2.

In embodiments where the portion of the seal 254 that is located within the second mounting bore 2521 and the portion of the seal 254 that is located within the first mounting bore 2511 are independent of each other, if the second portion 2545 is located entirely within the second mounting bore 2521, the "dimension of the portion of the seal 254 that is located within the second mounting bore 2521 is h", which refers to the distance between the second and fourth end surfaces 2543 and 2546 in the axial direction Y of the mounting bore; in embodiments where only a portion of the second portion 2545 is located within the second mounting bore 2521 and the second end surface 2543 is located within the second mounting bore 2521, the "dimension of the portion of the seal 254 located within the second mounting bore 2521 is h" refers to the distance between the second end surface 2543 and the fourth surface 2523 in the axial direction Y of the mounting bore.

In this embodiment, the second mounting hole 2521 extends through the second and fourth surfaces 2522 and 2523 of the second end cap 252. The "dimension k" of the second mounting hole 2521 refers to a distance between the second surface 2522 and the fourth surface 2523 along the axial direction Y of the mounting hole.

The dimension h of the portion of the seal 254 within the second mounting hole 2521 and the dimension k of the first mounting hole 2511 satisfy: h/k > 1/2, i.e., the dimension of the portion of the seal 254 located within the second mounting hole 2521 in the axial direction Y of the mounting hole is greater than half the axial dimension of the second mounting hole 2521, so that the contact area of the seal 254 with the hole wall of the second mounting hole 2521 is sufficiently large to improve the radial sealing performance of the seal 254 against the second end cap 252 and the electrode terminal 253.

In some embodiments, the first mounting hole 2511 has a dimension b ≧ 0.5mm along its axial direction; and/or the dimension of the second mounting hole 2521 along the axial direction is k, wherein k is more than or equal to 0.5mm.

The dimension b of the first mounting hole 2511 in the axial direction thereof, that is, the dimension of the first mounting hole 2511 in the axial direction Y of the mounting hole. b may be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.5mm, etc.

A dimension k of the second mounting hole 2521 in the axial direction thereof, i.e., a dimension of the second mounting hole 2521 in the axial direction Y thereof. k may be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.5mm, etc.

If the dimension b of the first mounting hole 2511 in the axial direction thereof is greater than or equal to 0.5mm, the first mounting hole 2511 has a sufficient area in contact with the sealing member 254 in the axial direction thereof, thereby ensuring the sealing performance of the sealing member 254 between the hole wall of the first mounting hole 2511 and the electrode terminal 253. If the dimension k of the second mounting hole 2521 along the axial direction thereof is not less than 0.5mm, the second mounting hole 2521 has a sufficient area in the axial direction thereof to contact the sealing member 254, thereby ensuring the sealing performance of the sealing member 254 between the wall of the second mounting hole 2521 and the electrode terminal 253.

Preferably, b is more than or equal to 1.2mm and less than or equal to 2.5mm; and/or k is more than or equal to 1.2mm and less than or equal to 2.5mm.

For example, b can be 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, 2.2mm, 2.3mm, and the like. k may be 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, 2.2mm, 2.3mm, etc.

If the dimension b of the first mounting hole 2511 in the axial direction meets the requirement that b is not less than 1.2mm and not more than 2.5mm, the first mounting hole 2511 can be ensured to have enough area to be in contact with the sealing element 254 in the axial direction, so that the sealing performance of the sealing element 254 between the hole wall of the first mounting hole 2511 and the electrode terminal 253 can be ensured, the dimension of the first end cover 251 in the axial direction of the first mounting hole 2511 can be controlled within a reasonable range, and the dimension of the end cover assembly 25 in the axial direction of the first mounting hole 2511 can be prevented from being too large.

If the dimension k of the second mounting hole 2521 along the axial direction thereof is equal to or greater than 1.2mm and equal to or less than 2.5mm, it is ensured that the second mounting hole 2521 has a sufficient area along the axial direction thereof to contact the sealing member 254, thereby ensuring the sealing performance of the sealing member 254 between the hole wall of the second mounting hole 2521 and the electrode terminal 253, and the dimension of the second end cap 252 along the axial direction of the second mounting hole 2521 is controlled within a reasonable range, thereby preventing the end cap assembly 25 from being oversized along the axial direction of the second mounting hole 2521.

As shown in fig. 20 and 21, in some embodiments, the sealing member 254 includes a body portion 2547 and a position-limiting portion 2548, the position-limiting portion 2548 is protruded from an outer circumferential surface of the body portion 2547, and the position-limiting portion 2548 extends at least partially between the first end cap 251 and the second end cap 252 in a radial direction of the mounting hole 2500.

The stopper portion 2548 is configured to stop the body portion 2547 along the axial direction Y of the mounting hole, so as to limit the range of movement of the body portion 2547 along the axial direction Y of the mounting hole or prevent the body portion 2547 from moving along the axial direction Y of the mounting hole.

The radial direction of the body portion 2547, i.e., the radial direction of the first mounting bore 2511, and/or the radial direction of the body portion 2547, i.e., the radial direction of the second mounting bore 2521, the radial direction of the first mounting bore 2511 and the radial direction of the second mounting bore 2521 are also radial directions of the mounting bore 2500.

The body portion 2547 is integrally formed. The body portion 2547 is fitted around the outer periphery of the terminal body 2531, a part of the body portion 2547 is inserted into the first mounting hole 2511, and a part of the body portion 2547 is inserted into the second mounting hole 2521. The stopper portion 2548 extends from the outer peripheral surface of the body portion 2547 in the radial direction of the body portion 2547. In the axial direction Y of the mounting hole, the position limiter 2548 has a first face 25481 and a second face 25482 opposite to each other, the first face 25481 is disposed facing the third face 2513 of the first end cap 251, the first face 25481 can abut against the third face 2513, the second face 25482 is disposed facing the fourth face 2523 of the second end cap 252, and the second face 25482 can abut against the fourth face 2523.

With the first face 25481 and the third face 2513 abutting and the second face 25482 and the fourth face 2523 abutting, the body portion 2547 of the seal 254 cannot move in the axial direction Y of the mounting bore.

The stopper portion 2548 can restrict the moving range of the body portion 2547 of the seal 254 in the axial direction Y of the mounting hole in the case where the first face 25481 and the third face 2513 have a gap in the axial direction Y of the mounting hole and/or the second face 25482 and the fourth face 2523 have a gap in the axial direction Y of the mounting hole.

The stopper portion 2548 and the body portion 2547 may be integrally formed such that the seal 254 is formed as an integrally formed structure. The integrally formed structure refers to a structure formed by an integrally forming method, such as injection molding, stamping, casting, and the like.

The stopper portion 2548 is used to stopper the body portion 2547 in the axial direction Y of the mounting hole, so as to reduce the amount of movement of the seal 254 in the axial direction Y of the mounting hole or to prevent the seal 254 from moving in the axial direction Y of the mounting hole, thereby reducing the risk of seal failure.

The structure of the stopper portion 2548 is various, for example, as shown in fig. 22, the stopper portion 2548 includes a plurality of stopper pieces 25483 arranged along a circumferential interval portion of the body portion 2547. Plural means two or more. The plurality of stopper blocks 25483 may be uniformly spaced or non-uniformly spaced along the circumferential direction of the body portion 2547.

For another example, as shown in fig. 23, the stopper portion 2548 continuously surrounds the outer periphery of the body portion 2547.

The stopper 2548 continuously surrounds the outer periphery of the body 2547 to form the stopper 2548 having an annular structure, so that the body 2547 can be stopped in the axial direction Y of the mounting hole at any position in the circumferential direction of the body 2547, the stability of the sealing member 254 relative to the first and second end caps 251 and 252 and the electrode terminal 253 is improved, and the risk of sealing failure is reduced.

In the present embodiment, the first and second end caps 251 and 252 sandwich the stopper portion 2548 (shown in fig. 21) in the axial direction Y of the mounting hole.

It is understood that the second surface 2522 of the first end cap 251 and the fourth surface 2523 of the second end cap 252 respectively abut against two end surfaces of the limiting member in the axial direction Y of the mounting hole, and then the second surface 2522, the fourth surface 2523 and the limiting portion 2548 cooperate to prevent the sealing member 254 from moving in the axial direction Y of the mounting hole.

The stopper portion 2548 is held by the first and second end caps 251 and 252, and the seal 254 cannot move in the axial direction Y of the mounting hole, thereby reducing the risk of seal failure.

As shown in fig. 21, in some embodiments, the composite end cap 250 further includes a first insulating member 257, the first insulating member 257 is stacked between the first end cap 251 and the second end cap 252 in the axial direction Y of the mounting hole, and the mounting hole 2500 penetrates through the first end cap 251, the second end cap 252, and the first insulating member 257; the mounting hole 2500 further includes a third mounting hole 2571 formed in the first insulating member 257.

The first insulator 257 has a third mounting hole 2571, and the third mounting hole 2571, the first mounting hole 2511 and the second mounting hole 2521 are coaxially arranged. The terminal body 2531 is inserted into the first mounting hole 2511, the second mounting hole 2521, and the third mounting hole 2571. Portions of the seal 254 may be located within the third mounting aperture 2571. Of course, in embodiments where the seal 254 includes the first portion 2544 and the second portion 2545 that are separate and unconnected to each other, neither the first portion 2544 nor the second portion 2545 may extend into the third mounting aperture 2571.

The first mounting hole 2511, the second mounting hole 2521, and the third mounting hole 2571 are coaxially arranged.

The diameter of the third mounting hole 2571 may be the same as or different from the diameter of the first mounting hole 2511. The diameter of the third mounting hole 2571 may be the same as or different from the diameter of the second mounting hole 2521. In the present embodiment, the diameter of the first mounting hole 2511 is larger than the diameter of the second mounting hole 2521, and the diameter of the first mounting hole 2511 is larger than the diameter of the third mounting hole 2571.

The first insulating member 257 is provided to prevent the battery 100 and the battery 100 including the end cap assembly 25 from being short-circuited due to the contact between the first end cap 251 and the second end cap 252, thereby improving the safety of the battery 100 and the battery 100 including the end cap assembly 25.

Further, due to the manufacturing tolerances of the respective components of the end cap assembly 25, that is, the manufacturing tolerance of the first end cap 251 in the axial direction Y of the mounting hole, the manufacturing tolerance of the second end cap 252 in the axial direction Y of the mounting hole, and the manufacturing tolerance of the first insulating member 257 in the axial direction Y of the mounting hole, if the sealing member 254 is sealed in the stacking direction of the first end cap 251, the first insulating member 257, and the second end cap 252 (that is, the axial direction Y of the mounting hole), the compression amount of the sealing member 254 in the axial direction Y of the mounting hole is the accumulation of the tolerances of the respective components in which the composite end cap 250 is stacked in the axial direction Y of the mounting hole, that is, the compression amount of the sealing member 254 in the axial direction Y of the mounting hole is the accumulation of the tolerance of the first insulating member 257 in the axial direction Y of the mounting hole, the tolerance of the first end cap 251 in the axial direction Y of the mounting hole, and the tolerance of the second end cap 252 in the axial direction Y of the mounting hole. The cumulative tolerance is too large, and the amount of compression of the seal 254 in the axial direction Y of the mounting hole fluctuates too much relative to the preset amount of compression, and insufficient compression of the seal 254 may occur to cause poor sealing or excessive compression of the seal 254 to damage the seal 254, resulting in unreliable sealing of the end cap assembly 25.

At least a portion of the sealing member 254 is disposed within the mounting hole 2500, the wall of the mounting hole 2500 and the electrode terminal 253 cooperatively clamp the portion of the sealing member 254 disposed within the mounting hole 2500, and the electrode terminal 253 and the wall of the mounting hole 2500 cooperate to compress the sealing member 254 to seal between the electrode terminal 253 and the mounting hole 2500 in the radial direction of the mounting hole 2500, and the amount of compression of the sealing member 254 in the radial direction of the mounting hole 2500 may fluctuate as determined by the sum of the radial tolerance of the electrode terminal 253 and the radial tolerance of the mounting hole 2500 as compared to a predetermined amount of compression, and this simplifies the dimensional chain in the compression direction of the sealing member 254 to reduce the influence of the cumulative dimensional tolerance, thereby improving the dimensional stability of the sealing interface and improving the sealing reliability as compared to the manner in which the sealing member 254 is compressed in the axial direction Y of the mounting hole to effect sealing of the composite end cap 250 and the electrode terminal 253 in the axial direction Y of the mounting hole.

Referring to fig. 21, in an embodiment where the sealing member 254 includes a body portion 2547 and a position-limiting portion 2548, the position-limiting portion 2548 is protruded from an outer circumferential surface of the body portion 2547, and the position-limiting portion 2548 extends at least partially between the first end cap 251 and the second end cap 252 along a radial direction of the mounting hole 2500, the position-limiting portion 2548 is located in the third mounting hole 2571.

In the embodiment where composite end cap 250 includes first insulator 257, if the dimension of first insulator 257 in axial direction Y of the mounting hole is larger than the dimension of stopper portion 2548 in axial direction Y of the mounting hole, a gap is formed between an end surface of stopper portion 2548 facing first end cap 251 and second surface 2522 and/or a gap is formed between an end surface of stopper portion 2548 facing second end cap 252 and fourth surface 2523, and then seal 254 can move in axial direction Y of the mounting hole to a certain extent. If the dimension of the first insulating member 257 in the axial direction Y of the mounting hole is smaller than or equal to the dimension of the stopper portion 2548 in the axial direction Y of the mounting hole, the end surface of the stopper portion 2548 facing the first end cap 251 abuts against the second surface 2522, and the end surface of the stopper portion 2548 facing the second end cap 252 abuts against the fourth surface 2523, so that the sealing member 254 cannot move in the axial direction Y of the mounting hole.

The position limiting portion 2548 is located in the third mounting hole 2571 and extends to between the first end cap 251 and the second end cap 252 in the radial direction of the mounting hole 2500, and the position limiting portion 2548 can limit the body portion 2547 in the axial direction Y of the mounting hole to reduce the movement amount of the sealing member 254 in the axial direction Y of the mounting hole or avoid the movement of the sealing member 254 in the axial direction Y of the mounting hole, so that the risk of sealing failure is reduced.

With continued reference to fig. 21, in some embodiments, the diameter of the third mounting hole 2571 is larger than that of the first mounting hole 2511, the diameter of the third mounting hole 2571 is larger than that of the second mounting hole 2521, and the position-limiting portion 2548 protrudes from the hole wall of the first mounting hole 2511 and the hole wall of the second mounting hole 2521 along the radial direction of the mounting hole 2500.

Along the radial direction of the third mounting hole 2571 (i.e., the radial direction of the mounting hole 2500), the position-limiting portion 2548 is located on the hole wall protruding from the first mounting hole 2511 and the hole wall of the second mounting hole 2521, and a third gap 260 may be formed between the outer circumferential surface of the position-limiting portion 2548 facing away from the body portion 2547 and the hole wall of the third mounting hole 2571, so as to provide a space for the deformation of the sealing member 254.

The limiting portion 2548 protrudes out of the hole wall of the first mounting hole 2511 and the hole wall of the second mounting hole 2521 along the radial direction of the mounting 2500, so that two ends of the limiting portion 2548 can respectively abut against the first end cover 251 and the second end cover 252 along the axial direction Y of the mounting hole, and the sealing element 254 is limited along the axial direction Y of the mounting hole, so that the risk of sealing failure is reduced.

In embodiments where the seal 254 has a stop 2548, the end cap assembly 25 may also be provided without the first insulator 257. The position-limiting portion 2548 extends between the first end cap 251 and the second end cap 252, along the axial direction Y of the mounting hole, the first surface 25481 of the position-limiting portion 2548 abuts against the third surface 2513 of the first end cap 251, the second surface 25482 of the position-limiting portion 2548 abuts against the fourth surface 2523 of the second end cap 252, and the position-limiting portion 2548 insulates and separates the first end cap 251 and the second end cap 252. In this case, the stopper portion 2548 functions to both restrict the movement of the seal 254 in the axial direction Y of the mounting hole and to insulate and separate the first end cap 251 and the second end cap 252.

In other embodiments, as shown in FIG. 24, the seal 254 may not include the stop portion 2548.

In some embodiments, the portion of the seal 254 located within the mounting hole 2500 along the radial direction of the mounting hole 2500 has a minimum thickness e that satisfies 0.5mm ≦ e ≦ 3mm.

As shown in fig. 17, 19 and 21, the thickness of the part of the sealing member 254 located in the first mounting hole 2511 in the radial direction of the first mounting hole 2511 is e1, and e1 is greater than or equal to 0.5mm and less than or equal to 3mm; and/or the thickness of the part of the sealing element 254, which is positioned in the second mounting hole 2521, along the radial direction of the second mounting hole 2521 is e2, and is more than or equal to 0.5mm and less than or equal to e2 and less than or equal to 3mm.

The "thickness e (e 1) of the portion of the seal 254 located in the first mounting hole 2511" refers to a dimension in the radial direction of the first mounting hole 2511 after the seal 254 is pressed by the hole wall of the first mounting hole 2511 and the outer peripheral surface of the terminal body 2531, and may also be understood as a distance between the hole wall of the first mounting hole 2511 and the outer peripheral surface of the terminal body 2531 in the radial direction of the first mounting hole 2511. For example, e (e 1) may be 0.6mm, 0.7mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.7mm, 2mm, 2.5mm, 2.8mm, etc.

The "thickness f (e 2) of the portion of the seal 254 located inside the second mounting hole 2521" refers to a dimension of the seal 254 in the radial direction of the second mounting hole 2521 after being pressed by the hole wall of the first mounting hole 2511 and the outer peripheral surface of the terminal body 2531, and may also be understood as a distance between the hole wall of the second mounting hole 2521 and the outer peripheral surface of the terminal body 2531 in the radial direction of the second mounting hole 2521. For example, f (e 2) may be 0.6mm, 0.7mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.7mm, 2mm, 2.5mm, 2.8mm, etc.

The minimum thickness e of the part of the sealing element 254 in the mounting hole 2500 meets the requirement that e is more than or equal to 0.5mm and less than or equal to 3mm, so that the radial compression amount of the sealing element 254 along the mounting hole 2500 is convenient to control, and the stability of sealing is improved.

Referring to fig. 21 and 25 in combination, in some embodiments, the electrode terminal 253 includes a terminal body 2531, the terminal body 2531 is disposed through the mounting hole 2500, and the sealing member 254 is disposed on an outer circumference of the terminal body 2531.

As shown in fig. 21 and 25, the terminal body 2531 includes a first section 25311 and a second section 25312 connected. The first section 25311 and the second section 25312 can be made of different materials, for example, the first section 25311 is made of copper and the second section 25312 is made of aluminum, or the first section 25311 is made of aluminum and the second section 25312 is made of nickel. The first section 25311 and the second section 25312 can be made of the same material, for example, the first section 25311 and the second section 25312 can be made of copper or aluminum.

The seal 254 is sleeved on the first section 25311 and the second section 25312.

In other embodiments, terminal body 2531 can also be a one-piece structure.

The terminal body 2531 is disposed through the first mounting hole 2511 and the second mounting hole 2521, so that the first end cap 251 and the second end cap 252 are both positioned and matched with the electrode terminal 253, and the relative stability of the electrode terminal 253, the first end cap 251 and the second end cap 252 is improved. The sealing member 254 is fitted around the outer circumference of the terminal body 2531 and can form a positioning fit with the electrode terminal 253, thereby improving the mounting stability and achieving a stable sealing effect.

With reference to fig. 21 and 25, in some embodiments, the electrode terminal 253 further includes a first connection portion 2532 and a second connection portion 2533, the first connection portion 2532 and the second connection portion 2533 both protrude from the outer periphery of the terminal body 2531, the first connection portion 2532 is disposed on a side of the first end cap 251 facing away from the second end cap 252, and the second connection portion 2533 is disposed on a side of the second end cap 252 facing away from the first end cap 251.

The first connection portion 2532 is sleeved on an end portion of the terminal body 2531, and in this embodiment, the first connection portion 2532 is sleeved on the first section 25311. The first section 25311 includes a first body portion 25313 and a first engaging portion 25314 connected to each other, the first body portion 25313 is connected to the second section 25312, and the first engaging portion 25314 is connected to an end of the first body portion 25313 away from the second section 25312. The diameter of the first nesting portion 25314 is smaller than the diameter of the first body portion 25313. The first connecting portion 2532 is sleeved on the outer periphery of the first sleeving portion 25314. The surface of the first connection portion 2532 facing the second end cap 252 abuts an end of the first body portion 25313 facing away from the second section 25312.

The second connecting portion 2533 is sleeved on the other end portion of the terminal body 2531, and in the present embodiment, the second connecting portion 2533 is sleeved on the second section 25312. The second section 25312 comprises a second body portion 25315 and a second hitching portion 25316 which are connected, the second body portion 25315 is connected with the first section 25311, and the second hitching portion 25316 is connected to one end of the second body portion 25315 which is far away from the first section 25311. The diameter of the second socketing portion 25316 is smaller than the diameter of the second body portion 25315. The second connecting portion 2533 is sleeved on the outer periphery of the second sleeved portion 25316. The surface of the second connecting portion 2533 facing the first end cap 251 abuts an end of the second body portion 25315 facing away from the first section 25311.

In this embodiment, the first connection portion 2532 is swaged to the terminal body 2531, the second connection portion 2533 is swaged to the terminal body 2531, and the first recess portion 2534 and the second recess portion 2535 are provided at both ends of the terminal body 2531 in the axial direction Y of the mounting hole, respectively. The first recess 2534 is recessed from an end of the first spigot portion 25314 of the first section 25311 that is away from the first body portion 25313 toward the second section 25312. The second recessed portion 2535 is recessed toward the first stage 25311 from an end of the second nesting portion 25316 of the second stage 25312 that is away from the second body portion 25315. The first and second recesses are for mating with a force applying member during a staking process. Of course, in other embodiments, the first connection portion 2532 and the terminal body 2531, the second connection portion 2533 and the terminal body 2531 may be connected by other connection methods, such as welding, bonding, bolting, etc. The tab of the first electrode assembly 23 may be electrically connected to the terminal body 2531 through the first connection portion 2532. The tab of the second electrode assembly 24 may be electrically connected to the terminal body 2531 through the second connection portion 2533.

In other embodiments, one of the first connection portion 2532 and the second connection portion 2533 may be integrally formed with the terminal body 2531, and the other is riveted with the terminal body 2531.

First connecting portion 2532 and second connecting portion 2533 all are connected with terminal body 2531, and are located the one side that first end cover 251 deviates from second end cover 252 and the one side that second end cover 252 deviates from first end cover 251 respectively, can play limiting displacement to make end cover assembly 25's structure more compact and can improve the stability of end cover assembly 25 structure.

As shown in fig. 21, 26, 27, in some embodiments, composite end cap 250 further comprises a second insulator 258 and a third insulator 259, at least a portion of second insulator 258 being positioned between first connector portion 2532 and first end cap 251 to insulate and isolate first connector portion 2532 from first end cap 251, and at least a portion of third insulator 259 being positioned between second connector portion 2533 and second end cap 252 to insulate and isolate second connector portion 2533 from second end cap 252.

The second insulator 258 may be only partially positioned between the first end cap 251 and the first connection portion 2532. As shown in fig. 21 and 26, the second insulating member 258 includes a first insulating portion 2581 and a second insulating portion 2582, and the first insulating portion 2581 is stacked and disposed between the first end cap 251 and the first connecting portion 2532 in the axial direction Y of the mounting hole so as to insulate and separate the first connecting portion 2532 and the first end cap 251. The first insulating portion 2581 has a first insertion hole 2583 through which the terminal body 2531 passes, and the first insertion hole 2583 and the first mounting hole 2511 are coaxially arranged. The diameter of the first receptacle 2583 is larger than the diameter of the first mounting hole 2511. The mounting hole 2500 also includes a first receptacle 2583 of the second insulator 258.

The second insulating portion 2582 is connected to the first insulating portion 2581, along the axial direction Y of the mounting hole, the second insulating portion 2582 extends from the first insulating portion 2581 along the direction departing from the first end cap 251, and the second insulating portion 2582 extends to the periphery of the first connecting portion 2532, the second insulating portion 2582 surrounds the periphery of the first connecting portion 2532, the first insulating portion 2581 and the second insulating portion 2582 jointly define a first accommodating portion accommodating the first connecting portion 2532, it can be understood that the second insulating member 258 covers the first connecting portion 2532, and the risk of short circuit of the battery 100 is further reduced. The first connection portion 2532 may also extend in a direction away from the first end cap 251 to extend out of the first receiving portion, so that the first connection portion 2532 is electrically connected to the tab of the first electrode assembly 23. In other embodiments, the first connection portion 2532 may be entirely located in the first receiving portion along the axial direction Y of the mounting hole.

In other embodiments, the second insulator 258 may also be located entirely between the first connection portion 2532 and the first end cap 251.

Only a portion of the third insulating member 259 may be positioned between the second end cap 252 and the second connection portion 2533. As shown in fig. 21 and 27, the third insulating member 259 includes a third insulating portion 2591 and a fourth insulating portion 2592, and the third insulating portion 2591 is stacked between the second end cap 252 and the second connecting portion 2533 in the axial direction Y of the mounting hole so as to insulate and separate the second connecting portion 2533 and the second end cap 252. The third insulating portion 2591 has a second insertion hole 2593 through which the terminal body 2531 passes, and the second insertion hole 2593 and the second mounting hole 2521 are coaxially arranged. The second insertion hole 2593 has a diameter larger than that of the second mounting hole 2521. The mounting hole 2500 further includes a second insertion hole 2593 of the third insulator 259.

The fourth insulating portion 2592 is connected to the third insulating portion 2591, the fourth insulating portion 2592 extends from the third insulating portion 2591 in the direction away from the second end cap 252 along the axial direction Y of the mounting hole, the fourth insulating portion 2592 extends to the outer periphery of the second connecting portion 2533, the fourth insulating portion 2592 is arranged around the outer periphery of the second connecting portion 2533, the third insulating portion 2591 and the fourth insulating portion 2592 jointly define a second accommodating portion for accommodating the second connecting portion 2533, it can be understood that the third insulating member 259 covers the second connecting portion 2533, and the risk of short circuit of the battery 100 is further reduced. The second connection portion 2533 may also extend out of the second receiving portion in a direction away from the second end cap 252 so that the second connection portion 2533 is electrically connected to the tab of the second electrode assembly 24. In other embodiments, the second connection portion 2533 may be entirely located in the second receiving portion along the axial direction Y of the mounting hole.

In other embodiments, the third insulator 259 may also be located entirely between the second connecting portion 2533 and the second end cap 252.

The provision of the second insulating member 258 and the third insulating member 259 can reduce the risk of short-circuiting the battery pack 20 and the battery 100 provided with the end cap assembly 25.

In the case where the end cap assembly 25 includes the second insulating member 258 and the fourth insulating member, if the sealing member 254 is sealed in the stacking direction of the first end cap 251, the first insulating member 257 and the second end cap 252 (i.e., the axial direction Y of the mounting hole), the compression amount of the sealing member 254 in the axial direction Y of the mounting hole is the cumulative of the tolerances of the respective components in which the composite end cap 250 is stacked in the axial direction Y of the mounting hole, that is, the compression amount of the sealing member 254 in the axial direction Y of the mounting hole is the cumulative of the tolerances of the first insulating member 257 in the axial direction Y of the mounting hole, the tolerances of the first end cap 251 in the axial direction Y of the mounting hole, the tolerances of the second end cap 252 in the axial direction Y of the mounting hole, and the tolerances of the second insulating member 258 in the axial direction Y of the mounting hole. The cumulative tolerance is too large and the amount of compression of the seal 254 in the axial direction Y of the mounting hole fluctuates too much relative to the preset amount of compression, and insufficient compression of the seal 254 may occur resulting in a poor seal or excessive compression of the seal 254 resulting in damage to the seal 254, resulting in an unreliable seal of the end cap assembly 25'.

The seal 254 is partially disposed within the first mounting bore 2511, partially disposed within the second mounting bore 2521, the bore wall of the first mounting bore 2511 and the electrode terminal 253 cooperatively clamp the portion of the seal 254 disposed within the first mounting bore 2511, and the bore wall of the second mounting bore 2521 and the electrode terminal 253 cooperatively clamp the portion of the seal 254 disposed within the second mounting bore 2521, such that the electrode terminal 253 and the bore wall of the mounting bore 2500 cooperate to compress the seal 254 to seal between the electrode terminal 253 and the mounting bore 2500 in the radial direction of the mounting bore 2500. The amount of compression of the seal 254 in the radial direction of the mounting bore 2500, as determined by the sum of the radial tolerance of the electrode terminal 253 and the radial tolerance of the mounting bore 2500, is simplified as compared to the manner in which the seal 254 is compressed in the axial direction Y of the mounting bore to effect sealing of the composite end cap 250 and the electrode terminal 253 in the axial direction Y of the mounting bore, thereby reducing the cumulative dimensional tolerance effects, thereby enhancing dimensional stability of the seal interface and enhancing reliability of the seal.

The embodiment of the present application further provides a battery assembly 20, where the battery assembly 20 includes a first housing 21, a second housing 22, and the end cap assembly 25 provided in any of the above embodiments; the first case 21 for accommodating the first electrode assembly 23; the second case 22 for accommodating the second electrode assembly 24; the first end cap 251 covers the opening of the first case 21, the second end cap 252 covers the opening of the second case 22, and the electrode terminals 253 are used to electrically connect the first electrode assembly 23 and the second electrode assembly 24.

In the present embodiment, the first end cap 251 covers the opening of the first case 21, and the two together define a space for accommodating the first electrode assembly 23. The second end cap 252 covers the opening of the second case 22, and together define a space for the second electrode assembly 24. The electrode terminals 253 conductively connect the positive electrode tab 231 of the first electrode assembly 23 and the negative electrode tab 241 of the second electrode assembly 24, respectively, to enable the first electrode assembly 23 and the second electrode assembly 24 to be connected in series.

The electrode terminal 253 and the positive tab 231 of the first electrode assembly 23 may be directly electrically connected, or the electrode terminal 253 and the positive tab 231 of the first electrode assembly 23 may be indirectly electrically connected through a current collecting member. The electrode terminal 253 and the negative electrode tab 241 of the second electrode assembly 24 may be in direct conductive connection, or the electrode terminal 253 and the negative electrode tab 241 of the second electrode assembly 24 may be in indirect conductive connection via a current collecting member.

The end cap assembly 25 provided in any of the above embodiments has a good sealing performance, and therefore, the battery assembly 20 provided with the end cap assembly 25 also has a good sealing performance, and the risk of leakage of the battery assembly 20 from the end cap assembly 25 is reduced.

The embodiment of the present application further provides a battery 100, and the battery 100 includes the battery assembly 20 provided in any of the above embodiments.

The embodiment of the present application further provides an electric device, and the electric device includes the battery 100 provided in the above embodiment.

The present embodiment provides a battery assembly 20, and the battery assembly 20 includes a first case 21, a second case 22, a first electrode assembly 23, a second electrode assembly 24, and an end cap assembly 25. The end cap assembly 25 includes a composite end cap 250 having a mounting aperture 2500. The composite end cap 250 includes a first end cap 251, a first insulator 257, a second end cap 252, an electrode terminal 253, a second insulator 258, a third insulator 259, and a seal 254. The second insulating member 258, the first end cap 251, the first insulating member 257, the second end cap 252, and the third insulating member 259 are sequentially stacked, and the mounting hole 2500 penetrates through the second insulating member 258, the first end cap 251, the first insulating member 257, the second end cap 252, and the third insulating member 259. The terminal body 2531 of the electrode terminal 253 sequentially passes through the first insertion hole 2583 of the second insulating member 258, the first mounting hole 2511 of the first end cap 251, the third mounting hole 2571 of the first insulating member 257, the second mounting hole 2521 of the second end cap 252, and the second insertion hole 2593 of the third insulating member 259. The first connection portion 2532 of the electrode terminal 253 is located at a side of the first end cap 251 facing away from the second end cap 252, and the second connection portion 2533 of the electrode terminal 253 is located at a side of the second end cap 252 facing away from the first end cap 251.

The first insulating member 257 insulates and separates the first and second end caps 251 and 252.

The first insulating portion 2581 of the second insulating member 258 insulates and separates the first end cap 251 and the first connection portion 2532 of the electrode terminal 253 in the axial direction Y of the mounting hole, and the second insulating portion 2582 of the second insulating member 258 extends from the first insulating portion 2581 to the outer periphery of the first connection portion 2532.

The third insulating portion 2591 of the third insulating member 259 insulates and separates the second end cap 252 and the second connection portion 2533 of the electrode terminal 253 in the axial direction Y of the mounting hole, and the fourth insulating portion 2592 of the third insulating member 259 extends from the third insulating portion 2591 to the outer periphery of the second connection portion 2533.

A portion of the body portion 2547 of the seal 254 is positioned in the first mounting hole 2511, and the outer circumferential surface of the terminal body 2531 of the electrode terminal 253 and the hole wall of the first mounting hole 2511 sandwich the portion of the body portion 2547 of the seal 254 positioned in the first mounting hole 2511, so that the seal 254 seals the electrode terminal 253 and the first end cap 251 in the radial direction of the first mounting hole 2511. First end surface 2541 of seal 254 is positioned within first mounting bore 2511 and first end surface 2541 is positioned closer to second end cap 252 relative to the surface of first end cap 251 facing away from second end cap 252 (first surface 2512) such that first gap 255 is formed between first end surface 2541 and first surface 2512 in axial direction Y of the mounting bore, it being understood that first end surface 2541 of seal 254 and the surface of first insulator 2581 facing first end cap 251 are not in contact in axial direction Y of the mounting bore.

A portion of the body portion 2547 of the seal 254 is positioned within the second mounting hole 2521, and the outer circumferential surface of the terminal body 2531 of the electrode terminal 253 and the hole wall of the second mounting hole 2521 cooperate to sandwich the portion of the body portion 2547 of the seal 254 positioned within the second mounting hole 2521, so that the seal 254 seals the electrode terminal 253 and the second end cap 252 in the radial direction of the second mounting hole 2521. The second end surface 2543 of the seal 254 is located within the second mounting hole 2521, and the second end surface 2543 is closer to the first end cap 251 than a surface (second surface 2522) of the second end cap 252 facing away from the first end cap 251, so that a second gap 256 is formed between the second end surface 2543 and the second surface 2522 along the axial direction Y of the mounting hole, it can also be understood that the second end surface 2543 of the seal 254 and a surface of the third insulating portion 2591 facing the second end cap 252 do not contact along the axial direction Y of the mounting hole.

The stopper 2548 of the seal 254 is projected from the outer peripheral surface of the body 2547 in the radial direction of the body 2547. The stopper portion 2548 is disposed around the body portion 2547 to form an annular structure. The position-limiting portion 2548 is located in the third mounting hole 2571, and a third gap 260 is formed between a surface of the position-limiting portion 2548 facing away from the body portion 2547 and a hole wall of the third mounting hole 2571 along a radial direction of the third mounting hole 2571.

The first electrode assembly 23 is accommodated in the first case 21, and the first end cap 251 of the end cap assembly 25 covers the opening of the first case 21. The second electrode assembly 24 is housed in the second case 22, and the second end cap 252 of the end cap assembly 25 covers the opening of the first case 21. The first and second connection portions 2532 and 2533 of the electrode terminal 253 are electrically connected to the positive electrode tab 231 of the first electrode assembly 23 and the negative electrode tab 241 of the second electrode assembly 24, respectively.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (22)

1. An end cap assembly, comprising:

the composite end cover is provided with a mounting hole penetrating through the composite end cover, the composite end cover comprises a first end cover and a second end cover which are arranged in a stacked mode along the axial direction of the mounting hole, the first end cover is used for covering an opening of a first shell and the second end cover is used for covering an opening of a second shell, and the mounting hole penetrates through the first end cover and the second end cover;

the electrode terminal penetrates through the mounting hole;

a seal member at least partially positioned within the mounting hole, and a hole wall of the mounting hole and the electrode terminal sandwich at least a portion of the seal member.

2. The end cap assembly of claim 1, wherein the mounting hole comprises a first mounting hole provided in the first end cap;

at least a portion of the seal is located within the first mounting hole, and the hole wall of the first mounting hole and the electrode terminal sandwich the portion of the seal located within the first mounting hole.

3. The end cap assembly of claim 2, wherein the seal member has a first end surface in an axial direction of the mounting bore, the first end surface being located within the first mounting bore.

4. An end cap assembly according to claim 2 or claim 3, wherein the portion of the seal member located within the first mounting hole in the axial direction of the mounting hole is of dimension a and the first mounting hole is of dimension b, wherein a/b > 1/2.

5. The end cap assembly of claim 2, wherein the mounting aperture further comprises a second mounting aperture provided in the second end cap;

a portion of the seal is located within the first mounting hole, a portion of the seal is located within the second mounting hole, and a hole wall of the second mounting hole and the electrode terminal sandwich the portion of the seal located within the second mounting hole.

6. The end cap assembly of claim 5, wherein the seal member has a second end face in an axial direction of the mounting hole, the second end face being located within the second mounting hole.

7. The end cap assembly of claim 5, wherein a portion of the seal member located within the second mounting hole in an axial direction of the mounting hole has a dimension h and the second mounting hole has a dimension k, wherein h/k > 1/2.

8. The end cap assembly of claim 5, wherein the first mounting hole has a dimension b along its axial direction, b ≧ 0.5mm; and/or the dimension of the second mounting hole along the axial direction is k, and k is more than or equal to 0.5mm.

9. The end cap assembly of claim 8, wherein 1.2mm ≦ b ≦ 2.5mm; and/or k is more than or equal to 1.2mm and less than or equal to 2.5mm.

10. The end cap assembly of claim 1, wherein the seal member includes a body portion and a retention portion that projects from an outer peripheral surface of the body portion and extends at least partially between the first end cap and the second end cap in a radial direction of the mounting bore.

11. The end cap assembly of claim 10, wherein the retention portion is continuous around the outer periphery of the body portion.

12. The end cap assembly of claim 10, wherein the first end cap and the second end cap clamp the restraint portion in an axial direction of the mounting hole.

13. The end cap assembly of claim 5, wherein the composite end cap further comprises a first insulator disposed between the first end cap and the second end cap in a stack in an axial direction of the mounting hole, the mounting hole extending through the first end cap, the second end cap, and the first insulator;

the mounting hole further comprises a third mounting hole formed in the first insulating member.

14. The end cap assembly of claim 13, wherein the seal member includes a body portion and a retention portion, the retention portion is disposed on an outer peripheral surface of the body portion and extends at least partially between the first end cap and the second end cap in a radial direction of the mounting hole, and the retention portion is disposed in the third mounting hole.

15. The end cap assembly of claim 14, wherein the third mounting hole has a larger diameter than the first mounting hole, the third mounting hole has a larger diameter than the second mounting hole, and the stopper protrudes from the wall of the first mounting hole and the wall of the second mounting hole in a radial direction of the mounting holes.

16. The end cap assembly of claim 1, wherein a portion of the seal member located within the mounting hole in a radial direction of the mounting hole has a minimum thickness e satisfying 0.5mm ≦ e ≦ 3mm.

17. The end cap assembly of claim 1, wherein the electrode terminal includes a terminal body, the terminal body is disposed through the mounting hole, and the sealing member is disposed around an outer periphery of the terminal body.

18. The end cap assembly of claim 17, wherein the electrode terminal further comprises a first connection portion and a second connection portion, the first connection portion and the second connection portion each protruding from an outer periphery of the terminal body, the first connection portion being disposed on a side of the first end cap facing away from the second end cap, the second connection portion being disposed on a side of the second end cap facing away from the first end cap.

19. An end cap assembly according to claim 18, wherein the composite end cap further comprises a second insulator and a third insulator, at least a portion of the second insulator being located between the first connector and the first end cap, and at least a portion of the third insulator being located between the second connector and the second end cap.

20. A battery assembly, comprising:

a first case for accommodating the first electrode assembly;

a second case for accommodating the second electrode assembly;

the end cap assembly of any one of claims 1-18, the first end cap covering the opening of the first housing, the second end cap covering the opening of the second housing, the electrode terminals for electrically connecting the first electrode assembly and the second electrode assembly.

21. A battery comprising the battery assembly of claim 20.

22. An electrical device comprising the battery of claim 21.

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