CN220138628U

CN220138628U - Single battery

Info

Publication number: CN220138628U
Application number: CN202321653536.4U
Authority: CN
Inventors: 林永翔; 袁铖; 杨伟; 陈辉
Original assignee: Xinwangda Power Technology Co ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2023-06-27
Filing date: 2023-06-27
Publication date: 2023-12-05
Anticipated expiration: 2033-06-27

Abstract

The utility model discloses a single battery. The unit cell includes a housing assembly having receiving chambers communicating with each other and assembly holes. The single battery also comprises an electrode assembly which is accommodated in the accommodating cavity. The single battery also comprises a pole, and the pole penetrates through the assembly hole. Wherein the electrode assembly includes an electrode body. The electrode assembly further comprises a first current collecting disc, the electrode main body is electrically connected with the pole through the first current collecting disc, the first current collecting disc is provided with a positioning groove, and the pole is embedded in the positioning groove. Through the mode, the welding yield of the electrode post of the single battery and the first current collecting disc can be improved.

Description

Single battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a single battery.

Background

As the heart of new energy automobiles, lithium ion batteries are widely used along with the rapid development of new energy automobiles. Among them, structural members having functions of reliable sealing, safety protection, internal and external electrical connection, and the like, have been attracting attention.

Currently, the poles of a battery are typically electrically connected to the electrical core in the battery through a current collecting plate. However, the polar post and the current collecting disc are easy to move relatively, so that the welding of the polar post and the current collecting disc is inconvenient, and the welding yield of the polar post and the current collecting disc is low.

Disclosure of Invention

The utility model provides a single battery, which can improve the welding yield of a pole column and a first current collecting disc of the single battery.

The utility model provides a single battery. The unit cell includes a housing assembly having receiving chambers communicating with each other and assembly holes. The single battery also comprises an electrode assembly which is accommodated in the accommodating cavity. The single battery also comprises a pole, and the pole penetrates through the assembly hole. Wherein the electrode assembly includes an electrode body. The electrode assembly further comprises a first current collecting disc, the electrode main body is electrically connected with the pole through the first current collecting disc, the first current collecting disc is provided with a positioning groove, and the pole is embedded in the positioning groove.

In one embodiment of the present utility model, the first collecting tray includes: a first current collecting body; and a plurality of first bulges, each first bulge protrudes towards the direction far away from the electrode main body relative to the first current collecting main body, and each first bulge is sequentially distributed at intervals along the circumferential direction of the first current collecting main body so as to form a positioning groove in a surrounding manner.

In an embodiment of the utility model, the electrode post has a first blind hole extending toward the electrode body, and an orifice of the first blind hole faces away from the electrode body.

In an embodiment of the utility model, the electrode post has a second blind hole, the second blind hole extends towards the electrode body, and an orifice of the second blind hole faces the electrode body; the first collecting disc is also provided with a second bulge, the second bulge is positioned in the positioning groove, and the second bulge is embedded in the second blind hole.

In one embodiment of the utility model, the post has a through hole extending toward the electrode body; the first collecting disc is also provided with a second bulge, the second bulge is positioned in the positioning groove, and the second bulge is embedded in the through hole.

In an embodiment of the utility model, the first current collecting plate further has a first current collecting body, and the second protrusion protrudes away from the electrode body with respect to the first current collecting body; the second bulge is provided with a first surface and a second surface, the first surface is opposite to the electrode body, the second surface faces the electrode body, and the first current collecting body is provided with a third surface opposite to the electrode body; wherein the first surface and the second surface are far away from the electrode body relative to the third surface; or, the first surface is far away from the electrode body relative to the third surface, and the second surface is flush with the third surface or the second surface is far away from the first surface relative to the third surface.

In an embodiment of the present utility model, the unit cell further includes: the insulating piece is clamped between the pole and the shell component, and the insulating piece is also clamped between the first current collecting disc and the shell component, so that the pole and the shell component are insulated from each other.

In one embodiment of the present utility model, a pole comprises: the pole body is penetrated through the assembly hole; the first limiting part is arranged at the end part of the pole main body, which is away from the electrode assembly; and the second limiting part is arranged at the end part of the pole body, facing the electrode assembly, and is electrically connected with the electrode assembly, wherein the shell assembly is clamped between the first limiting part and the second limiting part so as to fix the pole on the shell assembly.

In an embodiment of the present utility model, the unit cell further includes: the first sealing piece is clamped between the first limiting part and the shell assembly and is used for forming sealing between the first limiting part and the shell assembly; and the second sealing piece is clamped between the pole main body and the shell component and/or between the second limiting part and the shell component to form a seal.

In one embodiment of the present utility model, a housing assembly includes: a housing having a receiving cavity and an assembly hole; and the cover body is covered on the accommodating cavity, and one side of the cover body facing the accommodating cavity is provided with an explosion-proof notch.

In one embodiment of the present utility model, a housing assembly includes: a housing having a receiving cavity and an assembly hole; the cover body is covered on the accommodating cavity, the cover body is provided with a liquid injection hole and a mounting hole, the liquid injection hole is communicated with the accommodating cavity, electrolyte is injected into the accommodating cavity through the liquid injection hole, and the mounting hole is positioned at one side of the liquid injection hole away from the electrode assembly; and the plugging piece is embedded in the mounting hole to plug the liquid injection hole.

The beneficial effects of the utility model are as follows: the utility model provides a single battery, which is different from the prior art. The electrode assembly of the unit cell includes an electrode body and a first current collecting plate. The first current collecting disc is provided with a positioning groove, and the pole is embedded in the positioning groove. In other words, the positioning grooves on the pole and the first current collecting disc are mutually embedded to play a role in positioning, so that the situation that the pole and the first current collecting disc relatively move in the welding process can be relieved, and the welding yield of the pole and the first current collecting disc can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of a cell of the present utility model;

FIG. 2 is a schematic view showing a sectional structure of the unit cell A-A shown in FIG. 1;

FIG. 3 is a schematic view of an exploded structure of the battery cell shown in FIG. 1;

fig. 4 is a schematic structural view of a first embodiment of the cell B region shown in fig. 2;

fig. 5 is a schematic structural view of a second embodiment of the cell B region shown in fig. 2;

fig. 6 is a schematic structural view of a third embodiment of the cell B region shown in fig. 2;

fig. 7 is a schematic structural view of a fourth embodiment of the cell B region shown in fig. 2;

fig. 8 is a schematic structural view of a fifth embodiment of the cell B region shown in fig. 2;

fig. 9 is a schematic structural view of the region C of the unit cell shown in fig. 2;

fig. 10 is a schematic view of the structure of the cell D region shown in fig. 9.

Reference numerals illustrate:

10 single batteries; 11 a housing assembly; a 111 housing; 1111 receiving chamber; 1112 fitting holes; 112 cover; 1121 explosion-proof nicks; 1122 liquid injection hole; 1123 mounting holes; 113 a closure; 12 electrode assembly; 121 electrode body; 122 a first manifold disk; 1221 positioning grooves; 1222 a first current collecting body; 1223 a first protrusion; 1224 a second protrusion; 1225 a first surface; 1226 a second surface; 1227 a third surface; 123 a second manifold disk; 1231 a second current collecting body; 1232 liquid passing holes; 13 pole assemblies; 131 pole; 1311 pole body; 1312 first limit portion; 1313 a second stop; 132 a second seal; 133 a first blind hole; 134 a second blind hole; 135 through holes; 136 a first seal; 14 insulation.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the utility model. In the present utility model, unless otherwise indicated, terms of orientation such as "upper", "lower", "left" and "right" are generally used to refer to the directions of the upper, lower, left and right sides of the device in actual use or operation, and are specifically shown in the drawings.

In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "stacked," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The present utility model provides a single battery, which is described in detail below. It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present utility model. In the following embodiments, the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

In order to solve the technical problem of low welding yield of a pole and a current collecting disc in the prior art, an embodiment of the utility model provides a single battery. The unit cell includes a housing assembly having receiving chambers communicating with each other and assembly holes. The single battery also comprises an electrode assembly which is accommodated in the accommodating cavity. The single battery also comprises a pole, and the pole penetrates through the assembly hole. Wherein the electrode assembly includes an electrode body. The electrode assembly further comprises a first current collecting disc, the electrode main body is electrically connected with the pole through the first current collecting disc, the first current collecting disc is provided with a positioning groove, and the pole is embedded in the positioning groove. As will be described in detail below.

Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of an embodiment of a cell according to the present utility model, fig. 2 is a schematic structural diagram of a cross section of the cell A-A shown in fig. 1, and fig. 3 is a schematic exploded structural diagram of the cell shown in fig. 1.

In one embodiment, the unit cell 10 includes, but is not limited to, a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited by the embodiments of the present disclosure. The unit cell 10 is used to supply electric power to the electric device. The electric device can be a mobile phone, portable equipment, a notebook computer, a battery car, an electric automobile, a ship, a spacecraft, an electric toy, an electric tool and the like. For example, spacecraft include airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, electric planers, and the like.

Specifically, the cell 10 includes a housing assembly 11. The shell component 11 serves as a basic carrier of the single battery 10, and the shell component 11 plays a role in bearing and protecting the rest parts of the single battery 10. The housing assembly 11 has a receiving chamber 1111. Further, the housing assembly 11 includes a housing 111 and a cover 112. The housing 111 has a receiving cavity 1111 therein, and an end of the receiving cavity 1111 is an opening, and the cover 112 is covered on the opening.

The cell 10 further includes a post assembly 13, the post assembly 13 including a post 131. The housing assembly 11 further has a fitting hole 1112, specifically, the end of the housing 111 of the housing assembly 11 remote from the cover 112 is provided with the fitting hole 1112. The assembly hole 1112 communicates with the accommodating cavity 1111, and the pole 131 penetrates the assembly hole 1112.

The unit cell 10 further includes an electrode assembly 12, and the electrode assembly 12 is received in the receiving chamber 1111. The electrode assembly 12 includes an electrode body 121, a first current collecting plate 122, and a second current collecting plate 123. The electrode body 121 is formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a separator. Fig. 2 and 3 exemplarily show that the electrode body 121 is formed by winding a positive electrode sheet, a negative electrode sheet, and a separator. The positive pole piece and the negative pole piece are separated by a diaphragm to form insulation. The electrode body 121 is electrically connected to the electrode post 131 through the first current collecting plate 122, and the electrode body 121 is electrically connected to the cover 112 of the housing assembly 11 through the second current collecting plate 123. For example, the first current collecting plate 122 may be a positive current collecting plate, and one end of the electrode body 121 extends out of the positive tab to be electrically connected with the first current collecting plate 122; the second current collecting plate 123 is a negative current collecting plate, and the other end of the electrode body 121 extends out of the negative tab and is electrically connected to the second current collecting plate 123.

Referring to fig. 4 together, fig. 4 is a schematic structural diagram of a first embodiment of the cell B region shown in fig. 2.

In one embodiment, the pole 131 includes a pole body 1311, a first stop 1312, and a second stop 1313. The post body 1311 is disposed through the mounting hole 1112. The first stopper 1312 is provided at an end of the post body 1311 facing away from the electrode assembly 12. The second limiting portion 1313 is disposed at an end of the post body 1311 facing the electrode assembly 12, and the second limiting portion 1313 is electrically connected to the electrode assembly 12, specifically, the second limiting portion 1313 is electrically connected to the first current collecting plate 122.

The housing assembly 11 is sandwiched between the first limiting portion 1312 and the second limiting portion 1313 to fix the pole 131 to the housing assembly 11. Specifically, the first limiting portion 1312 is disposed protruding outward from the outer peripheral surface of the pole body 1311, and the second limiting portion 1313 is also disposed protruding outward from the outer peripheral surface of the pole body 1311. The first limiting portion 1312 and the second limiting portion 1313 cooperate to clamp the housing 111 around the assembly hole 1112, so as to fix the pole 131 to the housing 111.

Further, the pole assembly 13 also includes a first seal 136. The first seal 136 is sandwiched between the first limiting portion 1312 and the housing assembly 11, and the first seal 136 is used to form a seal between the first limiting portion 1312 and the housing assembly 11. The first seal 136 also serves to insulate the pole 131 and the housing 111 of the housing assembly 11 from each other. Specifically, the first seal 136 is located on the side of the case 111 facing away from the electrode assembly 12, and the first seal 136 is looped around the outer periphery of the post body 1311 and the first stopper 1312. The first seal 136 is interposed between the first stopper 1312 and the housing 111, so that the pole 131 and the housing 111 are sealed and insulated from each other. The first sealing member 136 may be formed by injection molding or the like to omit a rivet block required for fixing the pole 131 in the prior art, greatly simplifying the structure of the unit cell 10 and reducing the difficulty of assembling the pole 131 to the housing 111; meanwhile, the riveting block is omitted, so that the corresponding material cost and the processing cost are reduced.

Further, the pole assembly 13 also includes a second seal 132. The second seal 132 is sandwiched between the post body 1311 and the housing assembly 11 and/or between the second stop 1313 and the housing assembly 11 to form a seal. Specifically, the second seal 132 is disposed around the outer periphery of the post body 1311. A part of the second seal 132 is interposed between the outer circumferential surface of the post body 1311 and the wall of the fitting hole 1112, and another part of the second seal 132 is interposed between the second stopper 1313 and the housing 111 around the fitting hole 1112, so that the post 131 and the housing 111 are sealed and insulated from each other.

It should be noted that, in the embodiment of the present utility model, the first sealing member 136 and the second sealing member 132 cooperate to realize sealing between the pole 131 and the housing 111, so as to realize double sealing, i.e. in the embodiment of the present utility model, a good sealing effect is provided between the pole 131 and the housing 111.

In one embodiment, the first collecting plate 122 has a positioning groove 1221, and the pole 131 is embedded in the positioning groove 1221. In this way, in the present embodiment, the positioning grooves 1221 on the pole 131 and the first collecting plate 122 are mutually embedded to perform a positioning function, so that the situation that the pole 131 and the first collecting plate 122 move relatively in the welding process can be alleviated, and therefore, the welding yield of the pole 131 and the first collecting plate 122 can be improved.

Specifically, the first collecting tray 122 includes a first collecting body 1222 and a plurality of first bosses 1223. Each of the first protrusions 1223 protrudes with respect to the first current collecting body 1222 in a direction away from the electrode body 121. Wherein, each first protrusion 1223 is sequentially spaced apart along the circumferential direction of the first current collecting body 1222 to define a positioning slot 1221.

Further, the battery cell 10 further includes an insulator 14. The insulating member 14 is sandwiched between the pole 131 and the housing assembly 11, and the insulating member 14 is further sandwiched between the first collecting tray 122 and the housing assembly 11, so that the pole 131 and the housing assembly 11 are insulated from each other. Specifically, a part of the insulating member 14 is interposed between the second limit portion 1313 of the post 131 and the housing 111 around the fitting hole 1112 so that the post 131 and the housing 111 are insulated from each other, and another part of the insulating member 14 is interposed between each of the first protrusions 1223 of the first current collecting tray 122 and the housing 111 so that the first current collecting tray 122 and the housing 111 are insulated from each other.

It should be noted that, in the assembling process of the pole 131 and the housing 111 according to the embodiment of the present utility model, the pole 131 is penetrated out from the interior of the housing 111 through the assembling hole 1112, the pole 131 assembles the insulator 14 and the second seal 132 together to the housing 111, and then the first seal 136 is formed on the pole 131 by injection molding, so as to complete the assembling of the pole 131 and the housing 111.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a second embodiment of the cell B region shown in fig. 2.

In the first exemplary embodiment, the pole piece 131 has a first blind hole 133. The first blind hole 133 extends toward the electrode body 121, and an orifice of the first blind hole 133 faces away from the electrode body 121. In this way, in the present embodiment, the weight of the pole 131 can be reduced by providing the first blind hole 133 on the pole 131, so as to reduce the overall weight of the battery cell 10, and the material cost of the pole 131 can be reduced accordingly.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a third embodiment of the cell B region shown in fig. 2.

In a second exemplary embodiment, the pole piece 131 has a second blind hole 134. The second blind hole 134 extends toward the electrode body 121, and an orifice of the second blind hole 134 faces the electrode body 121. In this way, in the present embodiment, the weight of the post 131 can be reduced by providing the second blind hole 134 on the post 131, so as to reduce the overall weight of the battery cell 10, and the material cost of the post 131 can be reduced accordingly.

The first manifold plate 122 also has a second protrusion 1224. The second protrusion 1224 is located in the positioning groove 1221, and the second protrusion 1224 is embedded in the second blind hole 134. On the one hand, the second protrusions 1224 can further improve the positioning effect on the basis of the positioning groove 1221 surrounded by the first protrusions 1223, so as to further improve the welding yield of the polar column 131 and the first current collecting plate 122; on the other hand, the second protrusion 1224 cooperates with the second blind hole 134 to increase the contact area between the pole 131 and the first current collecting plate 122, which is beneficial to reducing the internal resistance of the unit battery 10 and improving the performance of the unit battery 10.

Further, the second protrusions 1224 protrude in a direction away from the electrode body 121 with respect to the first current collecting body 1222. The second protrusions 1224 have a first surface 1225 and a second surface 1226. The first surface 1225 faces away from the electrode body 121, and the second surface 1226 faces toward the electrode body 121. The first current collecting body 1222 has a third surface 1227 facing away from the electrode body 121. Wherein the first surface 1225 and the second surface 1226 of the second protrusion 1224 of the present embodiment are away from the electrode body 121 with respect to the third surface 1227 of the first current collecting body 1222.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a fourth embodiment of the cell B region shown in fig. 2.

In a third exemplary embodiment, the pole piece 131 has a second blind hole 134. The second blind hole 134 extends toward the electrode body 121, and an orifice of the second blind hole 134 faces the electrode body 121. In this way, in the present embodiment, the weight of the post 131 can be reduced by providing the second blind hole 134 on the post 131, so as to reduce the overall weight of the battery cell 10, and the material cost of the post 131 can be reduced accordingly.

This embodiment differs from the second exemplary embodiment described above in that the first surface 1225 of the second protrusion 1224 of this embodiment is remote from the electrode body 121 relative to the third surface 1227 of the first current collecting body 1222, and the second surface 1226 of the second protrusion 1224 is flush with the third surface 1227.

Of course, in other embodiments of the utility model, the second surface 1226 of the second protrusion 1224 may also be remote from the first surface 1225 relative to the third surface 1227 of the first current collecting body 1222, without limitation.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a fifth embodiment of the cell B region shown in fig. 2.

In the fourth exemplary embodiment, the pole 131 has a through hole 135. The through hole 135 extends toward the electrode body 121. In this way, the through hole 135 is provided in the pole 131 in the present embodiment, so that the weight of the pole 131 can be reduced, the overall weight of the battery cell 10 can be reduced, and the material cost of the pole 131 can be reduced accordingly.

The first current collecting plate 122 further has a second protrusion 1224, the second protrusion 1224 is located in the positioning groove 1221, and the second protrusion 1224 is embedded in the through hole 135. On the one hand, the second protrusions 1224 can further improve the positioning effect on the basis of the positioning groove 1221 surrounded by the first protrusions 1223, so as to further improve the welding yield of the polar column 131 and the first current collecting plate 122; on the other hand, the second protrusions 1224 are matched with the through holes 135, so that the contact area between the pole 131 and the first current collecting plate 122 can be increased, which is beneficial to reducing the internal resistance of the single battery 10 and improving the performance of the single battery 10.

Also, in this embodiment, the first surface 1225 of the second protrusion 1224 is remote from the electrode body 121 relative to the third surface 1227 of the first current collecting body 1222, and the second surface 1226 of the second protrusion 1224 is flush with the third surface 1227.

Referring to fig. 9 together, fig. 9 is a schematic structural diagram of the region C of the unit cell shown in fig. 2.

In one embodiment, the cover 112 is provided with a filling hole 1122 and a mounting hole 1123. The filling hole 1122 communicates with the receiving chamber 1111, and electrolyte is filled into the receiving chamber 1111 through the filling hole 1122, and the mounting hole 1123 is located at a side of the filling hole 1122 facing away from the electrode assembly 12. The housing assembly 11 further includes a closure 113. The blocking member 113 is fitted into the mounting hole 1123 to block the liquid injection hole 1122.

Further, the second collecting plate 123 includes a second collecting body 1231 and a liquid passing hole 1232 formed in the second collecting body 1231. In the liquid injection process, the blocking piece 113 does not block the liquid injection hole 1122, and electrolyte is injected into the accommodating cavity 1111 through the liquid injection hole 1122, specifically, electrolyte is injected into the accommodating cavity 1111 from the outside through the mounting hole 1123, the liquid injection hole 1122 and the liquid passing hole 1232 in sequence; after the filling is completed, the blocking member 113 is inserted into the mounting hole 1123, thereby blocking the filling hole 1122.

Referring to fig. 10 together, fig. 10 is a schematic structural diagram of the region D of the unit cell shown in fig. 9.

In one embodiment, the cover 112 of the housing assembly 11 has an explosion-proof score 1121. The explosion-proof notch 1121 can be broken under the action of the pressure difference between the inside and the outside of the accommodating cavity 1111 to release the high-temperature and high-pressure gas in the accommodating cavity 1111, thereby reducing the risk of the single battery 10 from explosion and other safety accidents.

Specifically, the explosion-proof score 1121 is located on the side of the cover 112 facing the accommodation chamber 1111, i.e., the explosion-proof score 1121 is located inside the housing assembly 11. Compared with the case where the explosion-proof score 1121 is exposed outside the housing assembly 11, the explosion-proof score 1121 of this embodiment is less prone to be corroded or damaged, which is beneficial to ensuring the realization of the explosion-proof pressure release function of the explosion-proof score 1121. The explosion vent 1121 may be a non-complete annular structure, i.e., the explosion vent 1121 is generally "C" shaped. Alternatively, the explosion-proof score 1121 may be a complete circular ring structure, i.e., the explosion-proof score 1121 is generally "O" shaped.

Of course, in other embodiments of the present utility model, the explosion-proof notch 1121 may be located on a side of the cover 112 facing away from the accommodating cavity 1111, which is not limited herein.

In summary, the present utility model provides a single battery. The first sealing piece of the single battery is formed between the pole and the shell in an injection molding mode and the like, so that a riveting block required for fixing the pole in the prior art is omitted, the structure of the single battery is greatly simplified, and the difficulty in assembling the pole on the shell is reduced; meanwhile, the riveting block is omitted, so that the corresponding material cost and the processing cost are reduced.

And, the electrode assembly of the unit cell includes an electrode body and a first current collecting plate. The first current collecting disc is provided with a positioning groove, and the pole is embedded in the positioning groove. In other words, the positioning grooves on the pole and the first current collecting disc are mutually embedded to play a role in positioning, so that the situation that the pole and the first current collecting disc relatively move in the welding process can be relieved, and the welding yield of the pole and the first current collecting disc can be improved.

The above description of the single battery provided by the utility model has been provided in detail, and specific examples are applied herein to illustrate the principles and embodiments of the utility model, and the above examples are only for helping to understand the method and core idea of the utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.

Claims

1. A single cell, characterized by comprising:

a housing assembly having receiving chambers communicating with each other and an assembly hole;

an electrode assembly accommodated in the accommodation chamber; and

the pole is penetrated through the assembly hole;

wherein the electrode assembly includes:

an electrode main body; and

the electrode body is electrically connected with the pole through the first current collecting disc, wherein the first current collecting disc is provided with a positioning groove, and the pole is embedded in the positioning groove.

2. The unit cell according to claim 1, wherein,

the first collecting tray includes:

a first current collecting body; and

the first protrusions are protruded relative to the first current collecting body in a direction away from the electrode body, and the first protrusions are sequentially distributed at intervals along the circumferential direction of the first current collecting body so as to form the positioning groove in a surrounding mode.

3. The unit cell according to claim 1, wherein,

the pole has a first blind hole extending toward the electrode body, and an orifice of the first blind hole facing away from the electrode body.

4. The unit cell according to claim 1, wherein,

the post has a second blind hole extending toward the electrode body, and an aperture of the second blind hole facing toward the electrode body;

the first collecting disc is also provided with a second bulge, the second bulge is positioned in the positioning groove, and the second bulge is embedded in the second blind hole.

5. The unit cell according to claim 1, wherein,

the post has a through hole extending toward the electrode body;

the first collecting disc is also provided with a second bulge, the second bulge is positioned in the positioning groove, and the second bulge is embedded in the through hole.

6. The unit cell according to claim 4 or 5, wherein,

the first current collecting disc is also provided with a first current collecting main body, and the second bulge protrudes relative to the first current collecting main body in a direction away from the electrode main body;

the second protrusion has a first surface facing away from the electrode body and a second surface facing toward the electrode body, and the first current collecting body has a third surface facing away from the electrode body;

wherein the first surface and the second surface are both remote from the electrode body relative to the third surface; or, the first surface is far away from the electrode body relative to the third surface, and the second surface is flush with the third surface or the second surface is far away from the first surface relative to the third surface.

7. The unit cell according to claim 1, wherein,

the single battery further includes:

the insulating piece is clamped between the pole and the shell component, and the insulating piece is also clamped between the first current collecting disc and the shell component, so that the pole and the shell component are insulated from each other.

8. The unit cell according to claim 1, wherein,

the pole comprises:

the pole body penetrates through the assembly hole;

the first limiting part is arranged at the end part of the pole main body, which is away from the electrode assembly; and

the second limiting part is arranged at the end part of the pole body, facing the electrode assembly, and is electrically connected with the electrode assembly, wherein the shell assembly is clamped between the first limiting part and the second limiting part, so that the pole is fixed on the shell assembly.

9. The unit cell according to claim 8, wherein,

the single battery further includes:

the first sealing piece is clamped between the first limiting part and the shell assembly and is used for forming sealing between the first limiting part and the shell assembly; and

and the second sealing piece is clamped between the pole main body and the shell assembly and/or between the second limiting part and the shell assembly so as to form a seal.

10. The unit cell according to claim 1, wherein,

the housing assembly includes:

a housing having the accommodation chamber and the fitting hole; and

the cover body is covered on the accommodating cavity, and one side of the cover body facing the accommodating cavity is provided with an explosion-proof notch.

11. The unit cell according to claim 1, wherein,

the housing assembly includes:

a housing having the accommodation chamber and the fitting hole;

the cover body is covered on the accommodating cavity, the cover body is provided with a liquid injection hole and a mounting hole, the liquid injection hole is communicated with the accommodating cavity, electrolyte is injected into the accommodating cavity through the liquid injection hole, and the mounting hole is positioned at one side of the liquid injection hole away from the electrode assembly; and

the blocking piece is embedded in the mounting hole to block the liquid injection hole.