CN220652269U - Energy storage device - Google Patents

Abstract

The utility model provides an energy storage device, and relates to the technical field of energy storage. The energy storage device comprises a shell, an electrode assembly, a current collecting disc and a positioning piece, wherein the electrode assembly is arranged in the shell; the current collecting disc is arranged in the shell and is arranged at one end along the axial direction of the electrode assembly, a protruding part is arranged at one side of the current collecting disc facing the shell, and the protruding part is connected with the inner wall of the shell; the positioning piece is arranged in the shell, at least part of the positioning piece is arranged on the peripheral wall of the electrode assembly and between the electrode assembly and the inner wall of the shell.

Description

Energy storage device

Technical Field

The present utility model relates generally to the field of energy storage technology, and more particularly to an energy storage device.

Background

Existing cylindrical electrode assemblies generally have the following two forms of manufacture:

1. the cylindrical electrode assembly is penetration welded, and if the electrode assembly lacks positioning in the case, it cannot be ensured that the electrode assembly is centrally disposed in the case. In long-term circulation, the electrode assembly can expand gradually, and the part of the electrode assembly close to the shell can prop against the shell and cannot release pressure, so that the long-term operation performance of the energy storage device is reduced, and the service performance of the energy storage device is influenced. In addition, the electrode assembly is easily subject to eccentricity during assembly, and scratches may occur when the electrode assembly is put into a can.

2. The cylindrical electrode assembly adopts a seam welding mode, and the current collecting disc cannot be right opposite to the through hole of the shell, so that the positioning effect is relatively poor.

Disclosure of Invention

The energy storage device provided by the utility model improves the positioning accuracy, thereby improving the reliability of the energy storage device.

According to one aspect of the present utility model, there is provided an energy storage device comprising:

a shell:

an electrode assembly disposed within the housing;

the current collecting disc is arranged in the shell and is arranged at one end along the axial direction of the electrode assembly, one side of the current collecting disc, facing the shell, is provided with a protruding part, and the protruding part is connected to the inner wall of the shell;

and the positioning piece is arranged in the shell, and at least part of the positioning piece is arranged on the peripheral wall of the electrode assembly and between the electrode assembly and the inner wall of the shell.

In some of these embodiments, the positioning member comprises: the side part is sleeved on the peripheral wall of the electrode assembly and arranged between the electrode assembly and the shell; wherein the side part is of a cylindrical structure; or, the side part is of a wave-shaped structure.

Because the appearance of electrode subassembly and shell is similar to cylindrical structure, the inner wall of the lateral part of cylindrical structure and the outer wall looks adaptation of electrode subassembly, the outer wall of lateral part and the inner wall looks adaptation of shell, and the lateral part plays the effect to electrode subassembly and shell follow-up to improve electrode subassembly's location accuracy.

The lateral part of wave structure is not smooth structure, but has certain fold structure, and the inner wall and the outer wall of lateral part do not correspond completely and contact with electrode assembly and shell, further play the effect of isolating electrode assembly and shell, reduce the risk of electrode assembly income shell in-process scratch.

In some of these embodiments, the positioning member comprises: an end portion disposed along one end of the electrode assembly in an axial direction and connected to the side portion; wherein the end part is of an annular structure; or, the end portion is provided with a plurality of through holes.

The end is attached to the shaft end of the electrode assembly, and the end is connected to the side part, so that the side part is fixed to the side part, and the side part is prevented from sliding along the outer peripheral wall of the electrode assembly.

The plurality of through holes can be arranged according to a certain rule, for example, the plurality of through holes can be distributed on the end part in a ring shape, a radial shape or a matrix shape, and the like, and the through holes can be used for facilitating the flow of electrolyte.

In some of these embodiments, the positioning member further comprises: the connecting part is arranged between the end part and the side part, is of an arc-shaped structure and has a radius R; wherein R is more than or equal to 0.2mm and less than or equal to 5mm.

The connecting part is positioned between the end part and the side part and is respectively connected with the end part and the side part, the connecting part plays a role in middle connection, is not of a right-angle structure, adopts an arc chamfer structure, further plays a guiding role, and is convenient for the electrode assembly and the positioning piece to be put into the shell together. The radius R of the connecting part is more than or equal to 0.2mm, so that the condition of sharp parts of the connecting part is avoided. The radius R of the connecting part is smaller than or equal to 5mm, so that the smooth transition function between the end part and the side part is realized.

In some of these embodiments, the end of the positioning member is disposed between the current collecting plate and the case, and the current collecting plate is disposed between the end of the positioning member and the electrode assembly; or, the end of the positioning member is disposed between the current collecting plate and the electrode assembly, and the current collecting plate is disposed between the end of the positioning member and the case.

The end of the positioning member may be disposed above the current collecting plate or below the current collecting plate in the axial direction of the electrode assembly, i.e., the current collecting plate and the positioning member are located between the electrode assembly and the case, and the positions of the current collecting plate and the positioning member may be interchanged.

In some of these embodiments, further comprising: the pole is penetrated through the shell and connected with the protruding part; a first insulating member disposed between the pole and the housing; and the second insulating piece is arranged between the current collecting disc and the shell.

The first insulating part can also be called an insulating sleeve, and is sleeved outside the pole and arranged between the outer wall of the pole and the inner wall of the mounting hole, and the first insulating part plays an insulating role between the pole and the shell, so that the situation that the pole and the shell are short-circuited is avoided.

The second insulating piece can also be called lower plastic, and the second insulating piece plays an insulating role between the current collecting disc and the shell, so that the short circuit of the current collecting disc and the shell is avoided.

In some embodiments, the housing is provided with a plug hole corresponding to the protruding part, and the protruding part is plugged into the plug hole and connected with the plug hole.

The plug hole of the shell and the protruding part of the current collecting disc are correspondingly arranged, after the electrode assembly is placed in the shell, the protruding part of the current collecting disc is inserted into the plug hole, and the positioning accuracy is further improved under the matching effect of the protruding part and the plug hole.

In some of these embodiments, the projection comprises: the plug-in part is plugged into the plug-in hole; and the limiting part is arranged between the current collecting disc and the plug-in part and is abutted to the shell.

The grafting portion sets up in the one end that spacing portion kept away from the mass flow dish, and grafting portion realizes carrying out the butt joint with the spliced eye of shell. The spacing portion sets up between collecting tray and grafting portion, and spacing portion plays collecting tray and grafting portion intermediate junction's effect, and spacing portion is along one side butt in the inner wall of shell of electrode assembly axial direction, and spacing portion plays spacing step's effect to inject grafting portion and peg graft the position in place to the spliced eye in-process, avoid the excessive condition of degree of depth of grafting portion.

In some embodiments, the plugging hole and the plugging portion are both in a horn-shaped structure, and a large opening end of the horn-shaped structure is arranged towards the collecting disc.

The large opening end of the horn-shaped structure is arranged towards the collecting disc, so that the plug-in part can be directly inserted into the plug-in hole. The side wall of the plug-in part and the inner wall of the plug-in hole are not straight wall structures, but inclined structures, so that the guide function is realized in the process of plugging the plug-in part into the plug-in hole.

In some embodiments, the projection is provided with a fill port.

The electrolyte can be injected into the electrode assembly by using the electrolyte injection port, and the protruding part has the dual functions of electrode column conduction and electrolyte injection at the moment, so that functional integration is realized.

One embodiment of the present utility model has the following advantages or benefits:

according to the energy storage device provided by the embodiment of the utility model, the positioning piece is at least partially arranged on the peripheral wall of the electrode assembly and between the electrode assembly and the inner wall of the shell, namely, the positioning piece is embedded into a gap between the electrode assembly and the shell, so that the electrode assembly and the shell are separated, and the electrode assembly can be centered relative to the shell. After the electrode assembly is inclined and eccentric or expands in long-time working, the positioning piece can avoid the condition that the pressure of the electrode assembly cannot be released due to the contact between the electrode assembly and the inner wall of the shell, and the service life and the service performance of the electrode assembly are improved. In addition, in the assembly process of the electrode assembly, the positioning piece provides guiding and protecting functions for the electrode assembly, and meanwhile, the positioning piece also plays a role in positioning between the current collecting disc and the electrode assembly, so that the electrode assembly is centered, the electrode assembly is prevented from being eccentric, and the condition that the electrode assembly is scratched in the process of being placed into the shell is reduced.

The bulge is arranged on the top surface of the collecting tray in a protruding way, and the distance between the collecting tray and the top of the shell can be reduced by utilizing the bulge of the collecting tray, so that reliable connection between the collecting tray and the inner wall of the shell is facilitated. It should be specially noted that, the energy storage device provided in this embodiment may not have a pole, and the protruding portion of the current collecting disc is directly welded with the housing, that is, a manner of penetrating welding without a pole is adopted, so that the process is simplified, and the production cost is saved.

Drawings

For a better understanding of the utility model, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present utility model. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. The above and other features and advantages of the present utility model will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Wherein:

fig. 1 is a schematic structural diagram of an energy storage device according to a first embodiment of the present utility model;

fig. 2 is a schematic diagram illustrating a partial enlarged view of an energy storage device according to a first embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a positioning member in an energy storage device according to a first embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a positioning member in an energy storage device according to a first embodiment of the present utility model;

fig. 5 shows a third schematic structural diagram of a positioning member in an energy storage device according to the first embodiment of the present utility model;

fig. 6 shows a second schematic structural diagram of the energy storage device according to the first embodiment of the present utility model;

fig. 7 is a schematic diagram showing a second enlarged partial view of the energy storage device according to the first embodiment of the present utility model;

fig. 8 is a schematic structural diagram of an energy storage device according to a second embodiment of the present utility model;

fig. 9 is a schematic enlarged view of a portion of an energy storage device according to a second embodiment of the present utility model;

fig. 10 is a schematic structural diagram of an energy storage device according to a third embodiment of the present utility model;

fig. 11 is a schematic partial enlarged view of an energy storage device according to a third embodiment of the present utility model.

Wherein reference numerals are as follows:

1. a housing; 11. a plug hole; 2. an electrode assembly; 3. a collecting tray; 4. a positioning piece; 5. a pole; 6. a first insulating member; 7. a second insulating member;

31. a protruding portion; 311. a plug-in part; 312. a limit part; 32. a liquid injection port;

41. a side portion; 42. an end portion; 421. a through hole; 43. and a connecting part.

Detailed Description

The technical solutions in the exemplary embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present utility model. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present utility model, and it should be understood that various modifications and changes can be made to the example embodiments without departing from the scope of the utility model.

In the description of the present utility model, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present utility model, it should be understood that the terms "upper", "lower", "inner", "outer", and the like in the exemplary embodiments of the present utility model are described in terms of the drawings, and should not be construed as limiting the exemplary embodiments of the present utility model. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

Example 1

The embodiment provides an energy storage device, as shown in fig. 1, the energy storage device includes a housing 1, an electrode assembly 2, a current collecting disc 3 and a positioning member 4, wherein the housing 1 is specifically an aluminum shell or a steel shell, the electrode assembly 2 is specifically a cylindrical electrode assembly, the electrode assembly 2 is disposed in the housing 1, and the current collecting disc 3 is disposed in the housing 1 and is disposed along one end of the electrode assembly 2 in the axial direction. The positioning member 4 is disposed within the case 1, and the positioning member 4 is at least partially disposed on the outer circumferential wall of the electrode assembly 2 and between the electrode assembly 2 and the inner wall of the case 1.

In the energy storage device provided in this embodiment, the positioning member 4 is at least partially disposed on the outer peripheral wall of the electrode assembly 2 and disposed between the electrode assembly 2 and the inner wall of the case 1, that is, the positioning member 4 is embedded in the gap between the electrode assembly 2 and the case 1, which plays a role in spacing the electrode assembly 2 and the case 1 and enables the electrode assembly 2 to be centered with respect to the case 1. After the electrode assembly 2 is tilted, decentered or expanded in long-time operation, the positioning member 4 can avoid the situation that the pressure of the electrode assembly 2 cannot be released due to the contact between the electrode assembly 2 and the inner wall of the housing 1, thereby improving the service life and the service performance of the electrode assembly 2. In addition, in the assembly process of the electrode assembly 2, the positioning piece 4 provides guiding and protecting functions for the electrode assembly 2, meanwhile, the positioning piece 4 also plays a role in positioning between the current collecting disc 3 and the electrode assembly 2, so that the electrode assembly 2 is centered, the electrode assembly 2 is prevented from being eccentric, and the condition that the electrode assembly 2 is scratched in the process of being put into the shell 1 is reduced.

As shown in fig. 1-2, a protruding portion 31 is disposed on a side of the collecting tray 3 facing the housing 1, and the protruding portion 31 is connected to an inner wall of the housing 1.

The protruding part 31 protrudes from the top surface of the collecting tray 3, and the distance between the collecting tray 3 and the top of the housing 1 can be reduced by using the protruding part 31 of the collecting tray 3, so that reliable connection between the collecting tray 3 and the inner wall of the housing 1 is facilitated. It should be specifically noted that, the energy storage device provided in this embodiment may not have a pole, and the protruding portion 31 of the current collecting disc 3 is directly welded with the housing 1, that is, a manner of penetrating welding without a pole is adopted, so that the process is simplified, and the production cost is saved.

It can be understood that the protruding portion 31 and the current collecting disc 3 can be in an integrally formed structure, so that the links of part assembly are reduced, and the production cost is low.

In some embodiments, the positioning member 4 is made of an insulating material; and/or the positioning member 4 is made of a corrosion resistant material. For example, the positioning member 4 may be made of plastic materials such as PE, PP, and PC, the positioning member 4 does not chemically react with the internal materials of the electrode assembly 2, and the positioning member 4 is not easily corroded.

In some embodiments, the thickness of the positioning member 4 is B; wherein, B is more than or equal to 0.1mm and less than or equal to 2mm.

The thickness B of the positioning member 4 is 0.1mm or more, and the positioning member 4 has a certain thickness, so that the electrode assembly 2 can be protected and guided. The thickness B of the positioning member 4 is 2mm or less, the thickness of the positioning member 4 cannot be excessively large, and the thickness of the positioning member 4 needs to be matched with the gap between the electrode assembly 2 and the case 1.

In some embodiments, as shown in fig. 3 to 5, the positioning member 4 includes a side portion 41, and the side portion 41 is sleeved on the outer circumferential wall of the electrode assembly 2 and disposed between the electrode assembly 2 and the case 1.

The side portion 41 has an annular structure, the side portion 41 may also be referred to as a protective sleeve, the side portion 41 is sleeved outside the outer peripheral wall of the electrode assembly 2, the side portion 41 plays a role in protecting the outer peripheral wall of the electrode assembly 2, and damage to the outer peripheral wall of the electrode assembly 2 is reduced. The lateral part 41 sets up between electrode assembly 2 and shell 1, and lateral part 41 fills in the space along electrode assembly 2 radial direction between electrode assembly 2 peripheral wall and the shell 1 inner wall, plays the effect of separation between electrode assembly 2 and the shell 1, reduces the risk that electrode assembly 2 and shell 1 contacted, and electrode assembly 2 can set up in shell 1 in the middle, reduces the eccentric risk of electrode assembly 2, extension electrode assembly 2 life.

Wherein the side portion 41 may be of cylindrical configuration (as shown in fig. 3). Since the outer shapes of the electrode assembly 2 and the case 1 are similar to the cylindrical structure, the inner wall of the side portion 41 of the cylindrical structure is matched with the outer wall of the electrode assembly 2, and the outer wall of the side portion 41 is matched with the inner wall of the case 1, that is, the side portion 41 plays a role in conforming to the shape of the electrode assembly 2 and the case 1, thereby improving the positioning accuracy of the electrode assembly 2.

Wherein the side portion 41 may also be of a wave-like configuration (as shown in fig. 4). The side 41 of the wavy structure is not a smooth structure, but has a certain fold structure, and the inner wall and the outer wall of the side 41 do not completely contact the electrode assembly 2 and the case 1, thereby further playing a role in isolating the electrode assembly 2 from the case 1 and reducing the risk of scratch during the process of putting the electrode assembly 2 into the case.

It will be appreciated that the side portion 41 provided in this embodiment includes, but is not limited to, a cylindrical or wave-like structure, but may be other structures, and may be adjusted according to actual production conditions.

In one embodiment, as shown in fig. 3 to 5, the positioning member 4 further includes an end portion 42, and the end portion 42 is disposed at one end in the axial direction of the electrode assembly 2 and connected to the side portion 41.

The end 42 is bonded to the axial end of the electrode assembly 2, and the end 42 is connected to the side 41 to fix the side 41, thereby preventing the side 41 from sliding along the outer peripheral wall of the electrode assembly 2.

Wherein the end 42 may be of annular configuration. The end 42 of the ring structure is lighter in weight and lower in raw material cost than the circular structure, and the protrusion 31 of the collecting tray 3 can pass through the central hole of the ring structure to be connected with the housing 1, and the central hole of the ring structure plays a role in avoiding.

Wherein the end 42 may also be provided with a plurality of through holes 421 (as shown in fig. 5). The plurality of through holes 421 may be arranged according to a certain rule, for example, the plurality of through holes 421 may be distributed on the end 42 in a ring shape, a radial shape, or a matrix shape, etc., so that the through holes 421 can facilitate the flow of the electrolyte.

In one embodiment, the positioning member 4 further includes a connecting portion 43, the connecting portion 43 is disposed between the end portion 42 and the side portion 41, and the connecting portion 43 has an arc-shaped structure.

The connecting parts 43 are positioned between the end parts 42 and the side parts 41 and are respectively connected with the end parts 42 and the side parts 41, the connecting parts 43 play a role in middle connection, the connecting parts 43 are not in right-angle structures, but in arc-shaped chamfer structures, the guiding function is further played, and the electrode assembly 2 and the positioning piece 4 are conveniently placed in the shell 1 together.

Wherein, the radius of the connecting part 43 is R, R is more than or equal to 0.2mm and less than or equal to 5mm. The radius R of the connecting portion 43 is 0.2mm or more, and the sharp portion of the connecting portion 43 is prevented. Since the connecting portion 43 mainly corresponds to the edge at the axial end of the electrode assembly 2, the radius of the connecting portion 43 cannot be excessively large, and the radius R of the connecting portion 43 is 5mm or less, so that the smooth transition between the end portion 42 and the side portion 41 is realized.

In one embodiment, as shown in fig. 1-2, the end 42 of the positioning member 4 is disposed between the current collecting plate 3 and the case 1, and the current collecting plate 3 is disposed between the end 42 of the positioning member 4 and the electrode assembly 2; alternatively, as shown in fig. 6 to 7, the end 42 of the positioning member 4 is disposed between the current collecting plate 3 and the electrode assembly 2, and the current collecting plate 3 is disposed between the end 42 of the positioning member 4 and the case 1.

In other words, the end 42 of the positioning member 4 may be disposed above the current collecting plate 3 or below the current collecting plate 3 in the axial direction of the electrode assembly 2, that is, the current collecting plate 3 and the positioning member 4 are located between the electrode assembly 2 and the case 1, and the positions of the current collecting plate 3 and the positioning member 4 may be interchanged.

In some embodiments, the positioning member 4 is detachably connected to the collecting tray 3, and the connection manner between the collecting tray 3 and the positioning member 4 may be specifically a clamping connection, an adhesive connection, a threaded connection, or the like, and the connection manner between the collecting tray 3 and the positioning member 4 may be selected according to actual production needs.

Specifically, one of the current collecting tray 3 and the positioning member 4 is provided with a clamping portion, and the other is provided with a matching portion, and the clamping portion is clamped and matched with the matching portion in a clamping manner, for example, the clamping portion can be a clamping hole or a clamping groove, and the matching portion can be a clamping protrusion or a clamping buckle. The clamping part can be formed on the collecting tray 3, the matching part can be formed on the positioning piece 4, and the clamping part can also be formed on the positioning piece 4, and the matching part is formed on the collecting tray 3, so that the structure is simple, and the assembly is convenient.

Example two

This embodiment is similar to the embodiment, except that the energy storage device has a pole 5.

As shown in fig. 8-9, the energy storage device provided in this embodiment further includes a pole 5, where the pole 5 is disposed through the housing 1 and connected to the protruding portion 31.

Specifically, the housing 1 is provided with mounting holes corresponding to the poles 5, the poles 5 pass through the mounting holes, one part of the poles 5 is located outside the housing 1, and the other part is located inside the housing 1. A welding area is provided on the side of the pole 5 facing the collector plate 3, by which welding area the pole 5 and the projection 31 of the collector plate 3 are connected.

In some embodiments, as shown in fig. 8-9, the energy storage device further comprises a first insulating member 6, the first insulating member 6 being disposed between the pole 5 and the housing 1.

The first insulating member 6 may also be referred to as an insulating sleeve, and the first insulating member 6 is sleeved outside the pole 5 and is disposed between the outer wall of the pole 5 and the inner wall of the mounting hole, and the first insulating member 6 plays a role in insulation between the pole 5 and the housing 1, so as to avoid a short circuit between the pole 5 and the housing 1.

In some embodiments, as shown in fig. 8-9, the energy storage device further comprises a second insulator 7, the second insulator 7 being disposed between the collector plate 3 and the housing 1.

The second insulating member 7 may also be referred to as lower plastic, and the second insulating member 7 plays a role of insulation between the current collecting plate 3 and the case 1, so as to prevent a short circuit between the current collecting plate 3 and the case 1.

Example III

This embodiment is similar to the first embodiment, and differs only in the manner of connection between the collecting tray 3 and the casing 1.

As shown in fig. 10-11, in the energy storage device provided in this embodiment, the housing 1 is provided with a plug hole 11 corresponding to the protrusion 31, and the protrusion 31 is plugged into and connected with the plug hole 11.

The plug hole 11 of the casing 1 and the protruding part 31 of the current collecting disc 3 are correspondingly arranged, after the electrode assembly 2 is placed in the casing 1, the protruding part 31 of the current collecting disc 3 is inserted into the plug hole 11, and the positioning accuracy is further improved under the matching effect of the protruding part 31 and the plug hole 11.

In addition, welding is performed at the position where the protrusion 31 and the insertion hole 11 contact each other, that is, the current collecting tray 3 and the case 1 are connected by seam welding. When the bulge 31 inserts to the jack 11, because the external diameter of the electrode assembly 2 is smaller than the internal diameter of the shell 1, the bulge 31 can not be accurately inserted into the jack 11, and the electrode assembly 2 can be supported at the central position of the shell 1 by using the positioning piece 4, so that the bulge 31 and the jack 11 can be accurately aligned, and the electrode assembly 2 is arranged centrally relative to the shell 1, so that the problem that the electrode assembly 2 expands and contacts with the shell 1 in the long-term use process can be effectively relieved.

In one embodiment, as shown in fig. 11, the protruding portion 31 includes a plug portion 311 and a stopper portion 312, the plug portion 311 is plugged into the plug hole 11, and the stopper portion 312 is disposed between the current collecting tray 3 and the plug portion 311 and abuts against the case 1.

Wherein, grafting portion 311 sets up in spacing portion 312 one end that is kept away from mass flow disk 3, and grafting portion 311 realizes carrying out the butt joint with the spliced eye 11 of shell 1. The spacing portion 312 is arranged between the current collecting tray 3 and the plugging portion 311, the spacing portion 312 plays a role in connecting the current collecting tray 3 with the plugging portion 311 in the middle, one side of the spacing portion 312 along the axial direction of the electrode assembly 2 is abutted to the inner wall of the shell 1, the spacing portion 312 plays a role in spacing steps to limit the position of the plugging portion 311 in place in the process of plugging to the plugging hole 11, and the situation that the plugging depth of the plugging portion 311 is excessive is avoided.

In one embodiment, the plugging holes 11 and the plugging portions 311 are in a horn-shaped structure, and the large opening end of the horn-shaped structure is disposed toward the collecting tray 3.

The large opening end of the horn-shaped structure is arranged towards the collecting tray 3, so that the plugging part 311 is conveniently inserted into the plugging hole 11. Since the side wall of the plugging portion 311 and the inner wall of the plugging hole 11 are not straight wall structures but inclined structures, a guiding function is performed in the process of plugging the plugging portion 311 into the plugging hole 11.

In one embodiment, the projection 31 is provided with a liquid filling port 32. By using the liquid injection port 32, electrolyte can be injected into the electrode assembly 2, and at this time, the protruding portion 31 performs the dual functions of conducting electricity and injecting liquid into the electrode column 5, thereby realizing functional integration.

It should be noted herein that the battery shown in the drawings and described in the present specification is only one example employing the principles of the present utility model. It will be clearly understood by those of ordinary skill in the art that the principles of the present utility model are not limited to any details or any components of the devices shown in the drawings or described in the specification.

It should be understood that the utility model is not limited in its application to the details of construction and the arrangement of components set forth in the specification. The utility model is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications are intended to fall within the scope of the present utility model. It should be understood that the utility model disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present utility model. The embodiments of the present disclosure illustrate the best mode known for carrying out the utility model and will enable those skilled in the art to make and use the utility model.

Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.

It is to be understood that the utility model is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.

Claims (10)

1. An energy storage device, comprising:

a shell:

an electrode assembly disposed within the housing;

the current collecting disc is arranged in the shell and is arranged at one end along the axial direction of the electrode assembly, one side of the current collecting disc, facing the shell, is provided with a protruding part, and the protruding part is connected to the inner wall of the shell;

and the positioning piece is arranged in the shell, and at least part of the positioning piece is arranged on the peripheral wall of the electrode assembly and between the electrode assembly and the inner wall of the shell.

2. The energy storage device of claim 1, wherein the positioning member comprises:

the side part is sleeved on the peripheral wall of the electrode assembly and arranged between the electrode assembly and the shell;

wherein the side part is of a cylindrical structure; or, the side part is of a wave-shaped structure.

3. The energy storage device of claim 2, wherein the positioning member comprises:

an end portion disposed along one end of the electrode assembly in an axial direction and connected to the side portion;

wherein the end part is of an annular structure; or, the end portion is provided with a plurality of through holes.

4. The energy storage device of claim 3, wherein the positioning member further comprises:

the connecting part is arranged between the end part and the side part, is of an arc-shaped structure and has a radius R;

wherein R is more than or equal to 0.2mm and less than or equal to 5mm.

5. The energy storage device of claim 3, wherein the end of the spacer is disposed between the current collecting tray and the housing, the current collecting tray being disposed between the end of the spacer and the electrode assembly; or alternatively, the first and second heat exchangers may be,

the end of the positioning member is disposed between the current collecting plate and the electrode assembly, and the current collecting plate is disposed between the end of the positioning member and the case.

6. The energy storage device of any of claims 1-5, further comprising:

the pole is penetrated through the shell and connected with the protruding part;

a first insulating member disposed between the pole and the housing;

and the second insulating piece is arranged between the current collecting disc and the shell.

7. The energy storage device of any of claims 1-5, wherein the housing is provided with a socket corresponding to the protrusion, the protrusion being plugged into and connected to the socket.

8. The energy storage device of claim 7, wherein the protrusion comprises:

the plug-in part is plugged into the plug-in hole;

and the limiting part is arranged between the current collecting disc and the plug-in part and is abutted to the shell.

9. The energy storage device of claim 8, wherein the socket and the socket are both in a horn-shaped structure, and a large mouth end of the horn-shaped structure is disposed toward the collecting tray.

10. The energy storage device of claim 7, wherein the protrusion is provided with a fill port.