CN220821718U

CN220821718U - Battery cell and battery pack

Info

Publication number: CN220821718U
Application number: CN202322426235.4U
Authority: CN
Inventors: 张兴; 苏家磊; 张旺; 李文成
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-09-06
Filing date: 2023-09-06
Publication date: 2024-04-19
Anticipated expiration: 2033-09-06

Abstract

The utility model discloses a battery monomer and a battery pack, wherein the battery monomer comprises a shell, and an explosion-proof valve is arranged on the bottom wall of the shell; the electrode pole group is arranged in the shell; the side plate is arranged in the shell and located below the electrode pole group and comprises a plate body and a boss arranged on the lower surface of the plate body, the boss is supported on the bottom wall of the shell, and a metal block is embedded in the boss. According to the battery cell, the metal blocks in the boss are not easy to melt, when the battery cell encounters high temperature, the metal blocks in the boss can still support the electrode pole group, the reliability of support is improved, the support effect is improved, the blockage of an exhaust channel caused by the contact between the bottom of the electrode pole group and the bottom wall of the shell is avoided, the exhaust is smooth, and the safety of the battery cell is improved.

Description

Battery cell and battery pack

Technical Field

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

Background

The design of the bottom-outlet pressure release valve (the pressure release valve of the lithium ion battery in the battery pack is downward) is favored by a plurality of whole vehicle manufacturers due to the safety advantages of short pressure release time, electric separation and the like, but the design of the bottom-outlet pressure release valve is easy to block an exhaust channel after the battery pack is out of control, so that the exhaust is not smooth, and potential safety hazard exists.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a battery cell which avoids blocking of an exhaust channel caused by contact between the bottom of the electrode pole group and the bottom wall of the shell, so that exhaust is smooth, and the safety of the battery cell is improved.

The utility model also provides a battery pack comprising the battery monomer.

According to an embodiment of the present utility model, a battery cell includes: the bottom wall of the shell is provided with an explosion-proof valve; the electrode pole group is arranged in the shell; the side plate is arranged in the shell and positioned below the electrode pole group, the side plate comprises a plate body and a boss arranged on the lower surface of the plate body, the boss is supported on the bottom wall of the shell, and a metal block is embedded in the boss.

According to the battery cell provided by the embodiment of the utility model, the electrode pole group is arranged in the shell, the side plate is arranged in the shell and below the electrode pole group, the side plate comprises the plate body and the boss arranged on the lower surface of the plate body, the boss is supported on the bottom wall of the shell, and the metal block is embedded in the boss. Therefore, the metal blocks in the boss are not easy to melt, and when the metal blocks in the boss meet high temperature, the electrode pole group can still be supported, so that the reliability of support is improved, the support effect is improved, the blockage of an exhaust channel caused by the contact between the bottom of the electrode pole group and the bottom wall of the shell is avoided, the exhaust is smooth, and the safety of a battery is improved.

In some embodiments of the utility model, the boss is a plurality of spaced apart bosses.

In some embodiments of the present utility model, the number of the bosses is two and are respectively disposed at two ends of the plate body in the length direction, and the bosses extend along the width direction of the plate body.

In some embodiments of the present utility model, the bosses are two and are respectively disposed at two ends of the plate body in the width direction, and the bosses extend along the length direction of the plate body.

In some embodiments of the utility model, the metal block is an aluminum, iron or copper piece.

In some embodiments of the utility model, the plate body and the boss are the same material except for the rest of the metal block.

In some embodiments of the utility model, the plate body is a PP piece or PPs piece.

In some embodiments of the utility model, the side panels are one piece.

In some embodiments of the utility model, the plate body is provided with a plurality of spaced through holes, wherein the total area of the plurality of through holes accounts for 40% -60% of the plate body area.

The battery pack according to the embodiment of the utility model comprises the battery cells.

According to the battery pack provided by the embodiment of the utility model, the battery unit is arranged, the electrode pole group is arranged in the shell, the side plate is arranged in the shell and below the electrode pole group, the side plate comprises the plate body and the boss arranged on the lower surface of the plate body, the boss is supported on the bottom wall of the shell, and the metal block is embedded in the boss. Therefore, the metal blocks in the boss are not easy to melt, and when the metal blocks in the boss meet high temperature, the electrode pole group can still be supported, so that the reliability of support is improved, the support effect is improved, the blockage of an exhaust channel caused by the contact between the bottom of the electrode pole group and the bottom wall of the shell is avoided, the exhaust is smooth, and the safety of a battery is improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

Fig. 1 is a perspective view of a side plate of a battery cell according to an embodiment of the present utility model, in which bosses are shown to be provided at both ends of a plate body in a length direction thereof;

Fig. 2 is a partial schematic view of a battery cell according to an embodiment of the present utility model, in which bosses are shown to be provided at both ends of a plate body in a length direction thereof;

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

fig. 4 is a perspective view of a side plate of a battery cell according to another embodiment of the present utility model, in which bosses are shown to be provided at both ends of a plate body in a width direction;

Fig. 5 is a side view of a side plate of a battery cell according to another embodiment of the present utility model, in which bosses are shown to be provided at both ends of a plate body in a width direction;

Fig. 6 is a partial schematic view of a battery cell according to another embodiment of the present utility model, in which bosses are shown to be provided at both ends of a plate body in the width direction.

Reference numerals:

10. a battery cell;

1. a side plate; 11. a plate body; 12. a boss; 13. a through hole;

2. A housing; 21. an explosion-proof valve; 22. an exhaust passage;

3. An electrode group.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

A battery cell 10 according to an embodiment of the present utility model is described below with reference to fig. 1-6.

As shown in fig. 1 to 6, a battery cell 10 according to an embodiment of the present utility model includes a case 2, a side plate 1, and an electrode group 3.

Specifically, referring to fig. 1 and 2, the bottom wall of the casing 2 is provided with an explosion-proof valve 21, the electrode group 3 is arranged in the casing 2, the side plate 1 is arranged in the casing 2 and below the electrode group 3, the side plate 1 comprises a plate body 11 and a boss 12 arranged on the lower surface of the plate body 11, the boss 12 is supported on the bottom wall of the casing 2, and a metal block is embedded in the boss 12.

It will be appreciated that the side plate 1 is located between the bottom wall of the casing 2 and the electrode pole group 3, the boss 12 protrudes downwards, the boss 12 is supported on the bottom wall of the casing 2, the plate body 11 is used for being connected with the electrode pole group 3, so that the side plate 1 can support the electrode pole group 3, the bottom of the electrode pole group 3 is also spaced from the bottom wall of the casing 2, thereby forming an exhaust passage 22, the explosion-proof valve 21 is communicated with the exhaust passage 22, when the internal thermal runaway of the electrode pole group 3 occurs, the hot air generated inside the electrode pole group 3 can flow to the exhaust passage 22, when the air pressure in the exhaust passage 22 reaches a certain value, the explosion-proof valve 21 is opened, and the air is discharged from the explosion-proof valve 21 on the bottom wall of the casing 2, thereby playing the role of pressure relief, so that the explosion of the battery cell 10 due to the excessive internal pressure can be prevented.

When the inside thermal runaway of electrode polar group, the curb plate is out of control because of high temperature melting deformation easily to thereby make electrode polar group down move and the diapire contact of casing arouse exhaust passage's jam, and boss 12 embeds and is equipped with the metal piece, thereby make the metal piece in boss 12 be difficult to melt, when meetting the high temperature, the metal piece in boss 12 still can support electrode polar group 3, from this, can improve the reliability of supporting, promote the supporting effect, avoid arousing exhaust passage's 22 jam because of electrode polar group 3's bottom and casing 2's diapire contact, thereby make the exhaust unobstructed, improve battery cell 10's security.

According to the battery cell 10 of the embodiment of the utility model, the electrode pole group 3 is arranged in the shell 2, the side plate 1 is arranged in the shell 2 and below the electrode pole group 3, the side plate 1 comprises the plate body 11 and the boss 12 arranged on the lower surface of the plate body 11, the boss 12 is supported on the bottom wall of the shell 2, and the boss 12 is embedded with a metal block. Therefore, the metal blocks in the boss 12 are not easy to melt, and when the metal blocks in the boss 12 meet high temperature, the electrode pole group 3 can still be supported, so that the reliability of support is improved, the support effect is improved, the blockage of the exhaust channel 22 caused by the contact between the bottom of the electrode pole group 3 and the bottom wall of the shell 2 is avoided, the exhaust is smooth, and the safety of the battery cell 10 is improved.

In some embodiments of the present utility model, as shown in fig. 1 and 4, the boss 12 is a plurality of spaced apart bosses. Thereby, the supporting effect is further improved, the blockage of the exhaust passage 22 caused by the contact between the bottom of the electrode pole group 3 and the bottom wall of the shell 2 is further avoided, the exhaust is smooth, and the safety of the battery cell 10 is further improved. In the example shown in fig. 1 and 4, the bosses 12 are two spaced apart, but the present utility model is not limited thereto, and the bosses 12 may be more spaced apart, such as 3, 4, 5, or 6, etc.

In some embodiments of the present utility model, as shown in fig. 1 to 3, there are two bosses 12 provided at both ends of the plate body 11 in the length direction, respectively, and the bosses 12 extend in the width direction of the plate body 11. It will be appreciated that the boss 12 extends in the width direction of the plate body 11, which may result in a reduced length of the boss 12 and a cost savings.

In some embodiments of the present utility model, as shown in fig. 4 to 6, the bosses 12 are provided at both ends of the plate body 11 in the width direction, respectively, and the bosses 12 extend in the length direction of the plate body 11. It can be understood that the boss 12 extends along the length direction of the plate body 11, so that the length of the boss 12 is large, the reliability of support is increased, the support effect is improved, the blockage of the exhaust channel 22 caused by the contact between the bottom of the electrode pole group 3 and the bottom wall of the shell 2 is further avoided, the exhaust is smooth, and the safety of the battery cell 10 is further improved.

In some embodiments of the utility model, the metal block is an aluminum, iron or copper piece. It will be appreciated that when the electrode assembly 3 is thermally out of control, high temperature gas is generated inside, and because the aluminum, iron or copper piece has a higher melting point, the high temperature gas generated inside can reach 300-600 ℃, the melting points of aluminum, iron and copper are 660 ℃, 1538 ℃ and 1083.4 ℃ respectively, which are higher than the highest temperature of the gas, when the high temperature gas contacts the boss 12, the metal blocks in the boss 12 will not melt, so that the metal blocks in the boss 12 can still support the electrode assembly 3, and the blockage of the exhaust channel 22 caused by the contact between the bottom of the electrode assembly 3 and the bottom wall of the housing 2 is avoided, so that the exhaust is smooth, and the safety of the battery cell 10 is further improved.

In some embodiments of the present utility model, the plate body 11 and the boss 12 are identical in material except for the rest of the metal block, thereby making the structure simple and facilitating the production of the plate body 11 and the boss 12.

In some embodiments of the present utility model, the plate body 11 is a PP (polypropylene) piece or a PPs (Polyphenylene sulfide ) piece. It can be understood that the electrolyte is arranged in the shell 2, the PP piece and the PPS piece have better corrosion resistance, the plate body 11 is the PP piece or the PPS piece, and the corrosion resistance of the side plate 1 in the electrolyte can be improved, so that the side plate 1 is stable in structure, and the service life of the side plate 1 is prolonged.

In addition, the plate body 11 and the rest of the boss 12 except for the metal block are made of the same material, so that the outer peripheral wall of the metal block is provided with a protective layer made of the same material as the plate body 11, and the protective layer can isolate the metal block from electrolyte, so that the metal block is prevented from rusting, the structural stability of the boss 12 is improved, the supporting reliability is improved, the blocking of an exhaust channel 22 caused by the contact between the bottom of the electrode pole group 3 and the bottom wall of the shell 2 is avoided, the exhaust is smooth, and the safety of the battery cell 10 is further improved.

In some embodiments of the utility model, the side plate 1 is a single piece. Thereby, the side plate 1 is structurally stable, and the supporting effect of the counter electrode group 3 is improved.

In some embodiments of the present utility model, as shown in fig. 1 and 4, the plate body 11 is provided with a plurality of spaced through holes 13. It will be appreciated that the plurality of through holes 13 are arranged at intervals in two rows in the width direction of the plate body 11, and each row of through holes 13 includes a plurality of through holes 13 arranged at intervals in the length direction of the plate body 11. The plurality of through holes 13 enable the high-temperature gas generated by the electrode pole group 10 to be discharged to the exhaust channel 22, thereby avoiding the high-temperature gas generated by the electrode pole group 10 from being blocked by the plate body 11, further enabling the exhaust to be smooth and improving the safety of the battery cell 10.

Further, if the total area of the plurality of through holes 13 occupies 40% -60%, such as 40%, 45%, 50% or 60%, of the area of the plate body 11, if the total area of the through holes 13 occupies more than 60% of the area of the plate body 11, the structural strength of the plate body 11 is too low, the electrode assembly 10 is easy to sink to block the exhaust channel 22, and the total area of the through holes 13 occupies less than 40% of the area of the plate body 11, which can cause the high temperature gas generated by the electrode assembly 10 to be blocked by the plate body 11, so that the exhaust is not smooth.

Therefore, the total area of the through holes 13 occupies 40% -60% of the area of the plate body 11, so that the structural strength of the plate body 11 can be ensured, the electrode group 10 is prevented from sinking to block the exhaust channel 22, and high-temperature gas generated by the electrode group 10 can be prevented from being blocked by the plate body 11, so that the exhaust is smooth.

A battery pack according to an embodiment of the present utility model is described below.

The battery pack according to the embodiment of the present utility model includes the above-described battery cell 10.

According to the battery pack of the embodiment of the utility model, by arranging the battery cell 10, the electrode pole group 3 is arranged in the shell 2, the side plate 1 is arranged in the shell 2 and below the electrode pole group 3, the side plate 1 comprises a plate body 11 and a boss 12 arranged on the lower surface of the plate body 11, the boss 12 is supported on the bottom wall of the shell 2, and a metal block is embedded in the boss 12. Therefore, the metal blocks in the boss 12 are not easy to melt, and when the metal blocks in the boss 12 meet high temperature, the electrode pole group 3 can still be supported, so that the reliability of support is improved, the support effect is improved, the blockage of the exhaust channel 22 caused by the contact between the bottom of the electrode pole group 3 and the bottom wall of the shell 2 is avoided, the exhaust is smooth, and the safety of the battery cell 10 is improved.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, comprising:

The bottom wall of the shell is provided with an explosion-proof valve;

The electrode pole group is arranged in the shell;

The side plate is arranged in the shell and positioned below the electrode pole group, the side plate comprises a plate body and a boss arranged on the lower surface of the plate body, the boss is supported on the bottom wall of the shell, and a metal block is embedded in the boss.

2. The battery cell of claim 1, wherein the boss is a plurality of spaced apart bosses.

3. The battery cell according to claim 2, wherein the number of the bosses is two and are provided at both ends of the plate body in the longitudinal direction thereof, respectively, and the bosses extend in the width direction of the plate body.

4. The battery cell according to claim 2, wherein the number of the bosses is two and are provided at both ends in the width direction of the plate body, respectively, and the bosses extend in the length direction of the plate body.

5. The battery cell of claim 1, wherein the metal block is an aluminum, iron, or copper piece.

6. The battery cell of claim 1, wherein the plate body and the boss are the same material except for the remainder of the metal block.

7. The battery cell of claim 1, wherein the plate body is a PP or PPs piece.

8. The battery cell of claim 1, wherein the side plate is a unitary piece.

9. The battery cell of claim 1, wherein the plate body is provided with a plurality of spaced apart through holes, wherein the total area of the plurality of through holes is 40% -60% of the plate body area.

10. A battery pack comprising the battery cell according to any one of claims 1 to 9.