CN211428293U

CN211428293U - Shell of battery cell and battery cell

Info

Publication number: CN211428293U
Application number: CN201922018294.1U
Authority: CN
Inventors: 李舒业; 张海建; 王超; 张若霞
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-09-04
Anticipated expiration: 2029-11-20

Abstract

The utility model relates to a lithium ion battery technical field, in particular to casing and electric core of electric core. The casing includes frame 1 and apron, the apron closing cap be in on the open-top 2 of frame 1 in order with frame 1 forms cavity 3 jointly, the apron be provided with the exhaust hole of cavity 3 intercommunication, lateral wall 10 of frame 1 is provided with well cavity 5, be equipped with air vent 4 on the well cavity 5, the different parts of the direction of height of cavity 3 can pass through air vent 4 with well cavity 5 intercommunication. The casing of electricity core is favorable to the different parts in the direction of height in the cavity to communicate through air vent and well cavity through setting up well cavity at the lateral part wall, has guaranteed still to have the cavity that communicates each other in the casing and the headspace of cavity as the exhaust passage of the gaseous of lamination face department, has guaranteed the smooth exhaust of casing, has avoided piling up a large amount of gases in the casing.

Description

Shell of battery cell and battery cell

Technical Field

The utility model relates to a lithium ion battery technical field, in particular to casing and electric core of electric core.

Background

With the continuous development of new energy automobiles, more and more lithium ion batteries are applied to the whole automobile. The top cover of the battery cell shell of the lithium ion battery is provided with an exhaust port, when the internal gas of the battery cell shell of the lithium ion battery exceeds a certain pressure, the gas can be discharged directionally from the set exhaust port, and the use safety of the lithium ion battery is ensured. Taking the battery core with a laminated structure as an example, the top and the side wall of the stacked battery core pole pieces and the shell respectively keep narrow intervals to form a top airflow channel and a side airflow channel, so that most of the gas between the battery core pole pieces can be discharged from the side airflow channel and the top airflow channel to the exhaust port along the gap between two adjacent battery core pole pieces.

However, since a narrow space is kept between the plurality of cell pole pieces and the side wall of the casing, the cell pole pieces can move to the side wall of the casing when being subjected to external forces such as vibration impact, the lateral airflow channel is blocked, the exhaust effect is seriously affected, a large amount of gas is accumulated in the casing, the overall temperature and the gas pressure in the casing are greatly increased, and the safety performance is poor.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a casing and electric core of electric core to solve lithium ion battery among the prior art and remove the exhaust effect that causes to the lateral wall that supports the casing because of a plurality of electric core pole pieces are poor, the security performance subalternation problem easily.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a casing of electric core, the casing includes frame and apron, the apron closing cap is in on the open-top of frame in order with the frame forms the cavity jointly, the apron be provided with the exhaust hole of cavity intercommunication, the lateral wall of frame is provided with well cavity, be equipped with the air vent in the cavity, the different parts of the direction of height of cavity can pass through the air vent with well cavity intercommunication.

Optionally, the hollow cavity extends along a height direction of the side wall.

Optionally, the side wall comprises a plurality of hollow cavities arranged in parallel.

Optionally, the side wall includes a plurality of vent holes arranged at intervals along the height direction;

and/or the vent holes are arranged into long round holes extending along the height direction.

Optionally, the frame includes the water conservancy diversion spare that has the concave-convex surface and is frame construction's body, the body includes open-top is in order to install the apron, the convex part butt of concave-convex surface in the lateral wall of body is so that the concave part of concave-convex surface forms with the lateral wall of body jointly well cavity, so that the water conservancy diversion spare with the lateral wall of body forms lateral wall, the concave part is provided with the air vent.

Optionally, the flow guide member is provided as an insulating member.

Optionally, the cross section of the body is rectangular, and the flow guides are respectively mounted on two side walls of the body extending along the short side direction of the rectangle.

Compared with the prior art, the casing of electricity core have following advantage:

the shell of the battery core is provided with the hollow cavity on the side wall, which is beneficial to the communication of different parts in the height direction in the cavity through the vent hole and the hollow cavity, so that when a laminated surface formed by the superposition of a plurality of battery core pole pieces of the battery core in the laminated structure is propped against the side wall of the shell, gas at the laminated surface (namely, gas in a gap formed by the side walls of two adjacent battery core pole pieces of the laminated surface) can still flow to a part at other height positions of the cavity through the vent hole and the hollow cavity (for example, a top space of the cavity, so that the gas is conveniently exhausted out of the shell through the vent hole), the hollow cavity and the top space of the cavity which are still communicated with each other in the shell are ensured to be used as an exhaust channel of the gas at the laminated surface, and the problem that the exhaust is slow due to the fact that the laminated surface of the plurality of battery core pole pieces of the laminated, the accumulation of a large amount of gas in the shell is avoided, and the safety performance is better.

Another object of the utility model is to provide an electricity core to solve lithium ion battery among the prior art and remove the exhaust effect that causes to the lateral wall that supports the casing because of a plurality of electric core pole pieces easily poor, the security performance subalternation problem.

a battery cell comprises a battery cell unit and a shell of the battery cell, wherein the battery cell unit is arranged in a cavity.

Optionally, the cell unit includes a plurality of cell pole pieces that are parallel to each other and stacked at intervals in a horizontal direction, a top space is formed between a surface of a plurality of top walls of the plurality of cell pole pieces and the cover plate, and gaps formed by two adjacent side walls on two sides of the plurality of cell pole pieces are respectively arranged corresponding to the vent holes, so that gas at the gaps can be discharged to the top space through the hollow cavities.

Optionally, the cell unit includes a plurality of cell pole pieces wound layer by layer.

Compared with the prior art, the advantages of the battery cell and the casing of the battery cell are the same, and are not described again.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a frame of a casing of a battery cell according to an embodiment of the present invention;

FIG. 2 is a top view of the frame shown in FIG. 1;

FIG. 3 is an enlarged view of a portion of the frame shown in FIG. 2;

FIG. 4 is a left side view of the left side baffle (or, alternatively, a right side view of the right side baffle) of the frame of FIG. 1;

FIG. 5 is a right side view of the left air guide in the frame of FIG. 1 (or, alternatively, a left side view of the right air guide);

fig. 6 is a top view of the left baffle in the frame of fig. 1.

Description of reference numerals:

1. a frame; 2. the top is open; 3. a chamber; 4. a vent hole; 5. a hollow cavity; 6. a flow guide member; 7. a body; 8. a convex portion; 9. a recess; 10. a side wall.

Detailed Description

In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

The utility model provides a casing of electricity core, as shown in fig. 1-6, the casing includes frame 1 and apron, the apron closing cap is in on the open-top 2 of frame 1 with frame 1 forms cavity 3 jointly, the apron be provided with the exhaust hole of cavity 3 intercommunication, lateral wall 10 of frame 1 is provided with well cavity 5, be equipped with air vent 4 on the well cavity 5, the different parts of the direction of height of cavity 3 can pass through air vent 4 with well cavity 5 intercommunication.

Through the technical scheme, the utility model provides a casing and electric core of electric core, the casing of electric core is through setting up cavity 5 in the lateral part wall, is favorable to the cavity 3 in the direction of height different parts can be through air vent 4 and cavity 5 intercommunication, when making the lamination face that a plurality of electric core pole pieces superpose of lamination structure's electric core support this lateral part wall 10 of casing, the gas of this lamination face department (i.e. the gas that lies in the clearance that the lateral wall of two adjacent electric core pole pieces formed at this lamination face department) still can flow to the part of other height position departments of cavity 3 through air vent 4 and cavity 5 (for example, the headspace of cavity, so that gas is via the exhaust hole discharge casing), guaranteed still have cavity 5 and the headspace of cavity that communicate each other in the casing as the exhaust passage of the gas of lamination face department, the problem of the range upon range of face of a plurality of electric core pole pieces of lamination's electric core support this lateral wall 10 of casing and block up the exhaust slowly that original exhaust passage led to is solved, avoided piling up a large amount of gas in the casing, be favorable to the casing inside to come the heat dissipation through the exhaust, the security performance is more excellent.

In order to facilitate the gas in the chamber 3 to smoothly flow between different parts of the vent hole 4 and the hollow cavity 5 in the height direction, the hollow cavity 5 extends along the height direction of the side wall 10, and the structure is simple and the manufacture is convenient.

Taking a battery cell with a laminated structure as an example, when a plurality of battery cell pole pieces of the battery cell integrally move relative to a casing along a left direction (or a right direction) shown in fig. 1, so that a left lamination surface (or a right lamination surface) of the plurality of battery cell pole pieces simultaneously abuts against a left side wall (or a right side wall) of the casing, in order to meet the exhaust requirements of the plurality of battery cell pole pieces, the side wall 10 includes a plurality of hollow cavities 5 arranged in parallel, so that gas between different gaps (the gap refers to a gap formed by side walls of two adjacent battery cell pole pieces at the lamination surface) of the plurality of battery cell pole pieces can be exhausted to a top space of the cavity through the vent holes 4 and the hollow cavities 5, and the exhaust effect of the plurality of battery cell pole pieces in the lamination direction of the plurality of battery cell pole pieces is optimized.

It will be appreciated that the vent 4 may be provided in various reasonable forms, for example, it may be provided as one, and the vent 4 may extend from the bottom of the hollow cavity 5 to the top of the hollow cavity 5, so that the hollow cavity 5 can communicate with different portions of the chamber 3 in the height direction through the vent 4. Further, the side wall 10 includes a plurality of vent holes 4 arranged at intervals in the height direction, which is beneficial for the gas at different heights in two adjacent pole pieces to be collected into the hollow cavity 5 through the vent holes 4, so that the gas at different heights in the gap formed by two adjacent cell pole pieces can be discharged to the top space of the cavity under the flow guiding effect of the hollow cavity 5, and the exhaust effect of the gas in two adjacent cell pole pieces in the height direction is optimized. Wherein, the vent hole 4 sets up to follow rectangular round hole that direction of height extends, simple structure, the processing of being convenient for.

As shown in fig. 1 to 6, the frame 1 includes a flow guide member 6 having a concave-convex surface and a body 7 having a structure of the frame 1, the body 7 includes the top opening 2 for installing the cover plate, the convex portion 8 of the concave-convex surface abuts against the sidewall of the body 7 so that the concave portion 9 of the concave-convex surface and the sidewall of the body 7 form the hollow cavity 5 together, so that the flow guide member 6 and the sidewall of the body 7 form the sidewall 10, the concave portion 9 is provided with the vent hole 4, the structure is simple, and the assembly is convenient, so that air between two adjacent battery cell pole pieces can be smoothly collected into the hollow cavity 5 and is discharged out of the vent hole via the top space of the cavity, so that the air can carry a large amount of heat to be discharged out of the casing in time, thereby effectively avoiding a thermal runaway phenomenon in the casing, and further solving a problem that two adjacent battery cell pole pieces are caused by the left laminated surface or the right laminated surface shown The problem of casing rupture is caused on directly spouting the casing to the high-temperature gas between individual electric core, has prevented that the casing from taking place to rupture the back have the burr to pierce electric core pole piece and cause electric core pole piece to be damaged and take place the short circuit, and the security performance is better. It will be appreciated that each of the recesses 9 is provided with a plurality of ventilation holes 4 arranged in the height direction.

Furthermore, the flow guide piece 6 is an insulating piece, so that the situation that when a battery core (for example, a lamination structure or a winding structure) finds out thermal runaway, a pole piece of the battery core directly props against the flow guide piece 6 to cause short circuit and gas generation and thermal runaway in the shell are aggravated by the short circuit is avoided, and the safety performance is improved. The flow guide member 6 should also have good high temperature resistance, for example, it is made of ceramic, glass, quartz, plastic, etc.

Further, the cross section of the body 7 is rectangular, the flow guide pieces 6 are respectively installed on the body 7 along two side walls extending in the direction of the short side of the rectangle, short circuit is avoided when a battery cell pole piece of a battery cell (for example, the battery cell pole piece can be of a laminated structure or a winding structure) abuts against the flow guide pieces 6, the exhaust function of the battery cell (for example, the laminated structure) is optimized, and the safety performance is improved. Furthermore, during assembly, the cell pole piece of the cell (for example, the cell pole piece may be of a laminated structure or a wound structure) may abut against the two flow guide members 6 at the same time, so that the flow guide members 6 may limit the cell pole piece of the cell to move integrally relative to the casing in the left-right direction shown in fig. 1, thereby playing a role in fixing the cell pole piece, and achieving better safety performance.

The utility model discloses the second aspect provides an electric core, electric core include electric core unit and the casing of electric core, electric core unit installs cavity 3. When the cell pole pieces of the cell (for example, the cell pole pieces may have a laminated structure or a wound structure) integrally move relative to the casing along the left direction (or the right direction) shown in fig. 1, a short circuit does not occur when the left end sides (or the right end sides) of the plurality of cell pole pieces simultaneously abut against the left side wall (or the right side wall) of the casing, thereby improving the safety performance.

Specifically, the battery cell unit includes a plurality of battery cell pole pieces that are parallel to each other and are stacked at intervals in the horizontal direction, a top space is formed between a surface where a plurality of top walls of the plurality of battery cell pole pieces are located and the cover plate, and a gap formed by every two adjacent side walls on two sides of the plurality of battery cell pole pieces is respectively arranged corresponding to the vent holes 4, so that gas at the gap can be discharged to the top space through the hollow cavity 5, the structure is simple, and the exhaust effect of the battery cell is optimized. Taking the integral left movement of the plurality of cell pole pieces of the cell relative to the housing along the left side direction shown in fig. 1 as an example, when the left lamination surface of the plurality of cell pole pieces moves left to abut against the left side wall of the housing, because the gas is easier to diffuse to the position with the minimum resistance, the gas in the gap formed by every two adjacent side walls of the left lamination surface is easier to collect into the hollow cavity 5 through the vent holes in different height directions, then flows upwards under the flow guiding effect of the hollow cavity 5 and is discharged to the top space of the cavity through the vent holes, and then is discharged out of the housing through the vent holes, so that the exhaust effect is better; of course, a small amount of gas between two adjacent cell pole pieces diffuses directly upward into the headspace. It can be understood that, in the process of moving left of the plurality of cell pole pieces, along with the left laminated surface of the plurality of cell pole pieces gradually approaching the left side wall of the casing, the exhaust gap between the left laminated surface of the plurality of cell pole pieces and the casing is reduced, and at the moment, the hollow cavity is used as an exhaust channel to assist the exhaust gap to exhaust. Furthermore, the side walls on the two sides of the plurality of battery cell pole pieces are respectively stopped by the diversion piece 6, so that the diversion piece 6 can fix the plurality of battery cell pole pieces, the battery cell pole pieces are prevented from moving left or right in the shell as shown in fig. 1 due to vibration impact, and the stability of the battery cell is improved.

In addition, the battery cell unit comprises a plurality of battery cell pole pieces wound layer by layer, so that the problem of short circuit caused when the wound battery cell pole pieces move along the left side or the right side shown in fig. 1 to abut against the left side wall or the right side wall of the shell is solved, and the safety performance is improved. Further, the outmost electric core pole piece of electric core unit supports left side wall and the right side wall of casing respectively for electric core unit can be fixed to water conservancy diversion piece 6, has prevented that electric core unit from taking place because of receiving the vibration impact and moving left or moving right as shown in figure 1 in the casing, has improved the stability of electric core.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a casing of electricity core, its characterized in that, the casing includes frame (1) and apron, the apron closing cap is in on open-top (2) of frame (1) in order with frame (1) forms cavity (3) jointly, the apron be provided with the exhaust hole of cavity (3) intercommunication, lateral part wall (10) of frame (1) are provided with well cavity (5), be equipped with air vent (4) on well cavity (5), the different parts of the direction of height of cavity (3) can pass through air vent (4) with well cavity (5) intercommunication.

2. The housing of a battery cell according to claim 1, characterized in that the hollow cavity (5) extends in the height direction of the side wall (10).

3. The casing of a cell according to claim 2, characterized in that the lateral wall (10) comprises a plurality of hollow cavities (5) arranged in parallel.

4. The casing of the battery cell of claim 2, wherein the side wall (10) comprises a plurality of vent holes (4) arranged at intervals in the height direction;

and/or the vent holes (4) are arranged into long round holes extending along the height direction.

5. The casing of the battery cell according to any one of claims 1 to 4, wherein the frame (1) comprises a flow guide member (6) having a concave-convex surface and a body (7) in a frame (1) structure, the body (7) comprises the top opening (2) for mounting the cover plate, a convex portion (8) of the concave-convex surface abuts against a side wall of the body (7) so that a concave portion (9) of the concave-convex surface and the side wall of the body (7) jointly form the hollow cavity (5), so that the flow guide member (6) and the side wall of the body (7) form the side wall (10), and the concave portion (9) is provided with the vent hole (4).

6. The housing of a battery cell according to claim 5, characterized in that the flow-conducting element (6) is provided as an insulating element.

7. The casing of the battery cell according to claim 6, wherein the cross section of the body (7) is rectangular, and the flow guiding members (6) are respectively mounted on two side walls of the body (7) extending along the direction of the short side of the rectangle.

8. A battery cell, characterized in that it comprises a housing of the battery cell according to any of claims 6 or 7 and a cell unit, which is mounted in the chamber (3).

9. The battery cell of claim 8, wherein the battery cell unit comprises a plurality of battery cell pole pieces which are parallel to each other and are stacked at intervals along a horizontal direction, a top space is formed between a surface of a top wall of the battery cell pole pieces and the cover plate, and gaps formed by every two adjacent side walls on two sides of the battery cell pole pieces are respectively arranged corresponding to the vent holes (4), so that gas at the gaps can be discharged to the top space through the hollow cavity (5).

10. The cell of claim 8, wherein the cell unit comprises a plurality of cell pole pieces wound layer-by-layer.