CN116613461A

CN116613461A - Battery and battery pack

Info

Publication number: CN116613461A
Application number: CN202310783275.6A
Authority: CN
Inventors: 李龙; 徐同力; 徐檑
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-06-28
Filing date: 2023-06-28
Publication date: 2023-08-18

Abstract

The invention relates to the technical field of batteries, and discloses a battery and a battery pack, wherein the battery comprises: the shell is internally provided with a containing cavity, the side surface of the shell is provided with an explosion-proof valve, and the explosion-proof valve is suitable for being opened when a preset pressure value is obtained; a pole group disposed in the accommodation chamber; the support piece is located between the side face of the shell provided with the explosion-proof valve and the pole group, the support piece comprises an annular support main body and an exhaust channel formed by surrounding the support main body, the exhaust channel covers the explosion-proof valve, a plurality of protruding portions extending towards the exhaust channel are formed on two side portions of the support main body along the width direction, and the protruding portions on the same side portion are distributed at intervals along the length direction of the support piece. According to the invention, the supporting piece is arranged between the shell and the pole group, the supporting main body plays a supporting role, the exhaust channel is communicated with the space where the pole group is positioned and the explosion-proof valve, the exhaust area is increased, and the protruding part is arranged, so that the supporting piece meets the requirements of supporting and exhausting at the same time, the extrusion deformation of the pole group can be avoided, and the smooth exhausting can be ensured.

Description

Battery and battery pack

Technical Field

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

Background

With the continuous development of battery industry technology, users have increasingly high requirements on batteries. In order to improve the safety performance of the battery monomer, a pressure relief mechanism is usually arranged on the battery monomer, and when the battery monomer operates abnormally and generates gas inside, the gas can be discharged through the pressure relief mechanism, so that larger safety accidents such as explosion and the like are avoided. The explosion-proof valve is arranged on the battery shell as a pressure relief mechanism, and for batteries with larger length, the explosion-proof valve is usually arranged on the side surface of the shell with longer length so as to balance the gas transmission path and avoid overlong gas transmission path caused by the arrangement of the explosion-proof valve on the end surfaces at the two ends along the length direction. However, because the space between the electrode group and the inner wall of the side surface of the shell is smaller, the gas transmission resistance in the battery is larger, the gas in the battery is not easy to be rapidly discharged, and potential safety hazards exist.

To solve the above problems, a vent space may be reserved by providing a support between the pole set and the side of the housing. However, if the supporting area of the supporting member is too small, the pole group is easy to be extruded and deformed due to the action of gravity, so that potential safety hazards are generated; if the supporting area of the supporting piece is too large, the exhaust space is small, and the problem of unsmooth exhaust exists, namely the supporting piece is difficult to meet the requirements of supporting and exhausting at the same time.

Disclosure of Invention

In view of the above, the present invention provides a battery and a battery pack to solve the problem that the support member in the existing battery is difficult to meet the requirements of support and exhaust.

In a first aspect, the present invention provides a battery comprising: the anti-explosion device comprises a shell, wherein an accommodating cavity is formed in the shell, an anti-explosion valve is arranged on the side face of the shell, and the anti-explosion valve is suitable for being opened when a pressure value is preset; a pole group disposed in the accommodation chamber; the support piece is located the shell is provided with the side of explosion-proof valve with between the utmost point group, the support piece is including being annular support main part and by the exhaust passage that the support main part formed around, the exhaust passage covers the explosion-proof valve, all be constructed with on two lateral parts of support main part along width direction towards a plurality of bulge that the exhaust passage extends, a plurality of on the same lateral part bulge is followed the length direction interval distribution of support piece.

The beneficial effects are that: through setting up support piece between shell and utmost point group, support piece is located the holding chamber of shell, the inner wall butt of the side of support main part's one side and the shell that is provided with the explosion-proof valve, and opposite side and utmost point group butt play the effect of supporting between utmost point group and shell, make and have certain interval between utmost point group and the shell, simultaneously, the space and the explosion-proof valve at exhaust passageway intercommunication utmost point group place, be convenient for hold the gaseous link up in the chamber, the area of exhausting has been increased, guarantee to hold the gas in the chamber and in time arrange explosion-proof valve place department, thereby guarantee that the explosion-proof valve is in time opened when predetermineeing the pressure value, thereby guarantee the security of battery, and, through setting up the bulge on support main part, the area of support main part has been increased, support piece has better supporting property, and the bulge is less for the size of support piece, can reduce the obstruction to exhaust passageway exhaust as far as possible, make support piece satisfied the demand of supporting and exhaust simultaneously, can avoid extremely group extrusion deformation, can guarantee the unobstructed exhaust again.

In an alternative embodiment, the protrusions on different sides are staggered.

The beneficial effects are that: through crisscross distribution between the bulge on two relative lateral parts, avoid two bulge direct relatively for exhaust space is more abundant, and the gas circulation resistance is littleer, and it is more smooth and easy to exhaust, and compare with the structure that two bulge direct relative set up, crisscross distribution between the bulge can suitably increase the bulge along width direction's size, also can not influence the exhaust patency, has still increased area of support simultaneously, makes support piece support to the polar group more effective.

In an alternative embodiment, the total area of the support is S and the area of the support body is S1, wherein 0.3.ltoreq.S1/S.ltoreq.0.7.

The beneficial effects are that: the ratio of the area of the supporting main body to the total area of the supporting piece is S and is set between 0.3 and 0.7, so that the supporting main body can provide an effective supporting effect, the smooth exhaust can be ensured, and the safety of the battery is improved.

In an alternative embodiment, the support has a dimension b in the width direction, and the two projections on different sides of the support body have a distance e in the width direction, wherein e is greater than or equal to 0.1b.

The beneficial effects are that: setting e to a value of 0.1b or more can ensure that the exhaust passage has a sufficient exhaust area, thereby ensuring an exhaust effect.

In an alternative embodiment, the dimension d of the side portion of the support body in the width direction and the dimension b of the support member in the width direction satisfy: d/b is more than or equal to 0.1 and less than or equal to 0.2.

The beneficial effects are that: the ratio of d to b is set between 0.1 and 0.2, so that the support piece is convenient to process and shape, the strength of the support piece is increased, deformation is prevented, the sufficient exhaust area can be ensured, and the smoothness of exhaust is ensured.

In an alternative embodiment, the distance L between two adjacent said projections on the same side of said support body is in the range of 50mm to 200mm.

The beneficial effects are that: the range of the distance L between two adjacent convex parts on the same side part of the supporting main body is set to be 50-200 mm, so that the smoothness of exhaust can be ensured, and the supporting piece can have enough supporting effect.

In an alternative embodiment, the thickness of the support member is in the range of 0.5mm to 5mm.

The beneficial effects are that: the range of the thickness of the supporting piece 3 is set to be 0.5mm-5mm, so that not only can enough exhaust space be ensured, but also the exhaust smoothness can be ensured, and the energy density of the battery can be improved.

In an alternative embodiment, the shape of the projection is configured as a semicircle or polygon.

The beneficial effects are that: the supporting function of the protruding part can be realized by the semicircular or polygonal shape, the selectivity is more, and the processing is convenient.

In an alternative embodiment, the polygon includes one or more of a triangle, a rectangle, and a trapezoid.

The beneficial effects are that: the triangle, rectangle and trapezoid have simple structure, convenient processing and low manufacturing cost. In a second aspect, the present invention also provides a battery pack comprising: the battery described above. Since the battery pack includes the battery, it has the same effect as the battery, and is not described herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a battery according to an embodiment of the present invention;

fig. 2 is a front view of the battery shown in fig. 1;

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 2;

FIG. 4 is an enlarged partial schematic view of FIG. 2A;

fig. 5 is an exploded view of the battery shown in fig. 1;

FIG. 6 is a schematic view of a pole set and support member according to an embodiment of the present invention;

FIG. 7 is a schematic view of a support member according to an embodiment of the present invention;

FIG. 8 is a top view of the support shown in FIG. 7;

FIG. 9 is an enlarged partial schematic view of B in FIG. 8;

FIG. 10 is an enlarged partial schematic view of C in FIG. 8;

FIG. 11 is a schematic view of the housing and explosion proof valve of an embodiment of the present invention;

fig. 12 is a schematic structural view of an insulating protective film according to an embodiment of the present invention.

Reference numerals illustrate:

1. a housing; 101. an explosion-proof valve; 102. a housing; 103. a cover plate; 104. an insulating protective film; 2. a pole group; 3. a support; 301. a support body; 3011. a protruding portion; 302. an exhaust passage; 303. a limit part; 3031. a first limit part; 3032. and a second limiting part.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Embodiments of the present invention are described below with reference to fig. 1 to 12.

According to an embodiment of the present invention, in one aspect, there is provided a battery including: a housing 1, a pole group 2 and a support 3. Specifically, a containing cavity is formed inside the housing 1, an explosion-proof valve 101 is arranged on the side surface of the housing 1, and the explosion-proof valve 101 is suitable for being opened when a pressure value is preset; the pole group 2 is arranged in the accommodating cavity; the support 3 is located between the side of the casing 1 where the explosion-proof valve 101 is provided and the pole group 2, the support 3 includes a support body 301 in the shape of a ring and an exhaust passage 302 surrounded by the support body 301, the exhaust passage 302 covers the explosion-proof valve 101, a plurality of protruding portions 3011 extending toward the exhaust passage 302 are configured on both sides of the support body 301 in the width direction, and the plurality of protruding portions 3011 on the same side are distributed at intervals in the length direction of the support 3.

According to the battery of the embodiment, the supporting piece 3 is arranged between the shell 1 and the pole group 2, the supporting piece 3 is located in the accommodating cavity of the shell 1, one side of the supporting main body 301 is abutted against the inner wall of the side face of the shell 1, where the explosion-proof valve 101 is arranged, and the other side of the supporting main body is abutted against the pole group 2, so that a certain distance is reserved between the pole group 2 and the shell 1, meanwhile, the air exhaust channel 302 is communicated with the space where the pole group 2 is located and the explosion-proof valve 101, gas in the accommodating cavity is conveniently communicated, the air exhaust area is increased, the gas in the accommodating cavity is ensured to be timely discharged to the position where the explosion-proof valve 101 is located, so that the explosion-proof valve 101 is timely opened when the preset pressure value is ensured, the safety of the battery is ensured, and the area of the supporting main body 301 is increased by arranging the protruding portion 3011 on the supporting main body 301, the supporting piece 3 is guaranteed to have good supporting performance, and the protruding portion 3011 is smaller than the size of the supporting piece 3, so that the obstruction to the air exhaust of the air exhaust channel 302 can be reduced as much as possible, the supporting piece 3 can simultaneously meet the requirements of supporting and the air exhaust channel 2, and the deformation of the pole group can be prevented.

The side surface of the housing 1 is a surface of the housing 1 extending in the "longitudinal direction" indicated by an arrow in fig. 1, and is preferably one of narrower side surfaces; the preset pressure value is a preset fixed value, and when the gas pressure in the battery reaches the preset pressure value, the explosion-proof valve 101 is opened to prevent explosion of the battery due to overlarge gas pressure in the battery; when the gas pressure in the battery is too high, the gas in the accommodating cavity flows to the explosion-proof valve 101 through the exhaust channel 302 on the support piece 3, the explosion-proof valve 101 is broken by high-pressure gas, and the opened explosion-proof valve 101 can exhaust the gas in the battery; the width direction refers to the "width direction" indicated by the arrow in fig. 8; the longitudinal direction refers to the "longitudinal direction" indicated by the arrow in fig. 1 and 8.

Specifically, the shape of the supporting piece 3 is matched with the side surface of the shell 1, on which the explosion-proof valve 101 is arranged, the supporting piece 3 is in a shape like a Chinese character 'hui', and can be formed by die cutting, so that the cost is low and the forming is convenient.

Specifically, the number of the explosion-proof valves 101 may be 1 or more, and the specific number may be set according to design requirements.

In one embodiment, the housing 1 is a closed structure, enclosing a receiving cavity. Specifically, the casing 1 includes a housing 102 and cover plates 103, openings at both ends of the housing 102 are provided, the cover plates 103 are provided in two, the two cover plates 103 respectively close the two openings at both ends of the housing 102, and the cover plates 103 are electrically connected with the pole group 2.

In addition, in other embodiments, one end of the housing 102 is opened, the other end of the housing 102 is closed, one cover plate 103 is provided, and one cover plate 103 is closed at the opening at one end of the housing 102.

In one embodiment, further referring to fig. 5, the housing 1 further includes an insulation protection film 104, and the insulation protection film 104 is disposed between the inner surface of the case 102 and the pole group 2 to insulate between the pole group 2 and the case 102. Specifically, the insulating protective film 104 is disposed on the outer side of the support member 3, that is, the support member 3 is located between the insulating protective film 104 and the pole group 2, and when the battery needs to be exhausted, the battery is in a high-temperature and high-pressure state, and at this time, the arrangement of the insulating protective film 104 does not affect the exhaust of the gas.

In one embodiment, the protrusions 3011 on different sides are staggered. It should be noted that, different lateral parts refer to two lateral parts that set up relatively along the width direction of support piece 3, through crisscross distribution between the bulge 3011 on two opposite lateral parts, avoid two bulge 3011 direct opposite for exhaust space is more abundant, and the gas circulation resistance is less, and it is more smooth and easy to exhaust, and compare with the structure that two bulge 3011 direct opposite set up, crisscross distribution between the bulge 3011 can suitably increase bulge 3011 along the size of width direction, also can not influence the exhaust smoothness, still increase the holding area simultaneously, make support piece 3 support to polar group 2 more effective.

In one embodiment, the total area of the support 3 is S and the area of the support body 301 is S1, wherein 0.3.ltoreq.S1/S.ltoreq.0.7. The total area S of the support 3 refers to the sum of the areas of the support body 301 and the exhaust passage 302. If the area of the supporting body 301 is S1 or less than 0.3S, the supporting body 301 will not have enough area to support the pole group 2 effectively, and the pole group 2 will deform and sink in the direction of the side surface where the explosion-proof valve 101 is disposed, thereby blocking the exhaust passage 302 and preventing the gas from being discharged in time; if the area of the supporting body 301 is S1 and is greater than 0.7S, the supporting element 3 can effectively support the pole group 2, but the area of the exhaust channel 302 is reduced, the exhaust space is insufficient, the resistance force applied during the gas exhaust is large, the gas cannot be exhausted in time, and there is a safety risk, so that the ratio of the area of the supporting body 301 to the total area of the supporting element 3, S1, is set between 0.3 and 0.7, which can ensure that the supporting body 301 can provide an effective supporting effect, ensure that the exhaust is smooth, and improve the safety of the battery. Preferably, the area of the support body 301 is s1=0.5S.

In one embodiment, the support 3 has a dimension b in its width direction, and the two protrusions 3011 located on different sides of the support body 301 have a distance e in the width direction, where e+.0.1 b. As further shown in fig. 8 and 9, the width direction refers to the "width direction" indicated by the arrow in fig. 8 and 9, the distance e between the protruding portions 3011 on the two opposite sides of the supporting body 301 along the width direction is the smallest dimension of the exhaust channel 302 along the width direction, and the size of e directly affects the exhaust effect of the exhaust channel 302, if e is smaller than 0.1b, the area of the exhaust channel 302 is too small, the exhaust space is insufficient, the resistance force during the gas exhaust is large, the gas cannot be exhausted in time, and there is a safety risk, so setting e to a value greater than or equal to 0.1b can ensure that the exhaust channel 302 has a sufficient exhaust area, thereby ensuring the exhaust effect. Preferably, e=0.35 b.

In one embodiment, the dimension d of the side portion of the support body 301 in the width direction and the dimension b of the support 3 in the width direction satisfy: d/b is more than or equal to 0.1 and less than or equal to 0.2. As further shown in fig. 8 and 9, if the ratio of the dimension d of the side portion of the support body 301 in the width direction to the dimension b of the support 3 in the width direction is less than 0.1b, the dimension of the side portion of the support body 301 is too small, which makes the processing and manufacturing of the support 3 difficult and is easy to deform; if the ratio of d to b is greater than 0.2b, the side of the support body 301 is oversized, the area of the exhaust channel 302 is correspondingly reduced, the exhaust space is insufficient, so that the gas cannot be exhausted in time, and a safety risk exists, therefore, the ratio of d to b is set between 0.1 and 0.2, which is convenient for the processing and forming of the support member 3, increases the strength of the support member 3, prevents deformation, and ensures sufficient exhaust area and exhaust smoothness. Preferably, d=0.15 b.

In one embodiment, the distance L between two adjacent protruding portions 3011 on the same side of the support body 301 has a value ranging from 50mm to 200mm. As further shown in fig. 8 and 9, the same side refers to any one of two sides of the support body 301 along the width direction, a plurality of protruding portions 3011 on the same side are equally spaced, if the distance L between two adjacent protruding portions 3011 is smaller than 50mm, the number of protruding portions 3011 provided on the support body 301 is too large, the density of the plurality of protruding portions 3011 is too large, and the area of the excessive exhaust channel 302 is occupied, so that the area of the exhaust channel 302 is reduced, the smoothness of exhaust is affected, and the weight of the support body 301 is correspondingly increased, so that the energy density of the battery is reduced; if the distance L between two adjacent protruding portions 3011 is greater than 200mm, the number of protruding portions 3011 provided on the supporting body 301 is too small, so that the area of the supporting body 301 where the supporting element 3 contacts with the pole group 2 is insufficient, and the pole group 2 cannot be effectively supported, and the pole group 2 has a risk of deforming and sinking in a direction of the side surface provided with the explosion-proof valve 101 to block the exhaust channel 302, so that gas cannot be timely discharged, therefore, the value range of the distance L between two adjacent protruding portions 3011 located on the same side portion of the supporting body 301 is set to be 50mm-200mm, which not only can ensure the smoothness of exhaust, but also can ensure that the supporting element 3 has a sufficient supporting effect. Preferably, the distance L between two adjacent protruding portions 3011 located on the same side of the support body 301 is 120mm.

In one embodiment, the thickness of the support 3 is in the range of 0.5mm to 5mm. It should be noted that, the thickness of the supporting member 3 refers to the dimension of the supporting member 3 along the "height direction" indicated by the arrow in fig. 5, the thickness of the supporting member 3 determines the distance between the pole group 2 and the housing 102, which directly affects the size of the exhaust space, if the thickness of the supporting member 3 is smaller than 0.5mm, the thickness of the supporting member 3 is too small, the space between the pole group 2 and the housing 102 along the height direction is insufficient, the exhaust space of the exhaust channel 302 is insufficient, the resistance force applied during the gas exhaust is larger, the gas cannot be exhausted in time, and there is a safety risk; if the thickness of the supporting member 3 is greater than 5mm, the supporting member 3 is too thick, which occupies too much space inside the casing 102, so that the height of the pole group 2 is reduced, the energy of the battery is reduced, and the improvement of the battery performance is not facilitated, therefore, the range of the thickness of the supporting member 3 is set to be 0.5mm-5mm, not only can enough exhaust space be ensured, but also the exhaust smoothness can be ensured, and the energy density of the battery can be improved.

In one embodiment, the shape of the tab 3011 is configured to be semi-circular or polygonal. The supporting function of the protruding part can be realized by the semicircular or polygonal shape, the selectivity is more, and the processing is convenient.

In one embodiment, the polygon includes one or more of a triangle, a rectangle, and a trapezoid, and the shape of the protruding portion 3011 is configured to one or more of a triangle, a rectangle, and a trapezoid. The shape has simple structure, convenient processing and low manufacturing cost. Specifically, when the shape of the protruding portion 3011 is configured as one or more of a triangle, a rectangle, and a trapezoid, corners of the shape are configured as smoothly transiting arcs to reduce stress and improve stability. Of course, the shape of the projection 3011 may also be configured in other polygons than a triangle, a rectangle, and a trapezoid.

In one embodiment, the support body 301 further comprises: at least one stopper 303, the stopper 303 is supported between both side portions of the support body 301 in the width direction of the support body 301. Through setting up spacing portion 303, support the inside of supporting body 301 to supporting body 301 two lateral parts, avoid support piece 3 to produce sunken deformation in width direction, increase support piece 3 bulk strength, the assembly of support piece 3 of being convenient for to guarantee the exhaust effect of exhaust channel 302. It should be noted that, the limiting portion 303 and the supporting body 301 are integrally formed, and may be formed by die cutting or injection molding; at least one limiting part 303 divides the exhaust channel 302 into at least two areas, each area corresponds to at least one explosion-proof valve 101, and the limiting part 303 does not block the explosion-proof valve 101, so that the opening of the explosion-proof valve 101 is prevented from being influenced.

Specifically, the limiting portion 303 includes a first limiting portion 3031 and a second limiting portion 3032, a first end of the first limiting portion 3031 is connected to one side of the inner ring of the support body 301, a first end of the second limiting portion 3032 is connected to the other side of the inner ring of the support body 301, and a second end of the first limiting portion 3031 and a second end of the second limiting portion 3032 are disposed close to each other. By disposing the first and second stopper portions 3031 and 3032 close to each other, the supporting effect of the entire stopper portion 303 on the supporting body 301 is ensured.

According to an embodiment of the present invention, in another aspect, there is also provided a battery pack including the above battery.

Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims

1. A battery, comprising:

the anti-explosion device comprises a shell, wherein an accommodating cavity is formed in the shell, an anti-explosion valve is arranged on the side face of the shell, and the anti-explosion valve is suitable for being opened when a pressure value is preset;

a pole group disposed in the accommodation chamber;

the support piece is located the shell is provided with the side of explosion-proof valve with between the utmost point group, the support piece is including being annular support main part and by the exhaust passage that the support main part formed around, the exhaust passage covers the explosion-proof valve, all be constructed with on two lateral parts of support main part along width direction towards a plurality of bulge that the exhaust passage extends, a plurality of on the same lateral part bulge is followed the length direction interval distribution of support piece.

2. The battery of claim 1, wherein the protrusions on different sides are staggered.

3. The battery of claim 1, wherein the total area of the support is S and the area of the support body is S1, wherein 0.3 ∈s1/S ∈0.7.

4. The battery according to claim 1, wherein the support member has a dimension b in a width direction thereof, and two protrusions located on different sides of the support body have a distance e in the width direction, wherein e is equal to or greater than 0.1b.

5. The battery according to claim 3, wherein a dimension d of the side portion of the support main in the width direction and a dimension b of the support in the width direction satisfy: d/b is more than or equal to 0.1 and less than or equal to 0.2.

6. The battery according to claim 1, wherein the distance L between two adjacent protrusions located on the same side of the support body has a value ranging from 50mm to 200mm.

7. The battery according to any one of claims 1 to 6, wherein the thickness of the support member has a value in the range of 0.5mm to 5mm.

8. The battery according to any one of claims 1 to 6, wherein the shape of the protruding portion is configured in a semicircle or a polygon.

9. The battery of claim 8, wherein the polygon comprises one or more of a triangle, a rectangle, and a trapezoid.

10. A battery pack, comprising: the battery of any one of claims 1 to 9.