CN116646675A

CN116646675A - Battery and battery pack

Info

Publication number: CN116646675A
Application number: CN202310788619.2A
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: 2023-08-25

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 first preset pressure value is obtained; a pole group disposed in the accommodation chamber; the support piece is positioned between the side surface of the shell, on which the explosion-proof valve is arranged, and the polar group, at least one fracture area is constructed on the support piece, at least part of the fracture area is constructed as a thinning part, the thickness of the thinning part is smaller than that of the main body part of the support piece, and the thinning part is suitable for fracture when the second preset pressure value is used for conducting the accommodating cavity and the explosion-proof valve, wherein the second preset pressure value is smaller than the first preset pressure value. The support piece plays a role in supporting between the pole group and the shell, and the thinning part breaks before the explosion-proof valve is opened, so that the explosion-proof valve is communicated with the accommodating cavity, the exhaust space is increased, and the gas in the accommodating cavity is conveniently and timely discharged to the explosion-proof valve, so that the gas in the battery can be timely discharged through the explosion-proof valve.

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 serious potential safety hazards exist when the gas in the battery cannot be timely discharged.

Disclosure of Invention

In view of the above, the present invention provides a battery and a battery pack to solve the problem that the gas inside the battery cannot be discharged in time.

In a first aspect, the present invention provides a battery comprising: a housing, in which a receiving chamber is formed, the side of which is provided with an explosion-proof valve adapted to be opened at a first preset pressure value; a pole group disposed in the accommodation chamber; the support piece is positioned between the side surface of the shell, on which the explosion-proof valve is arranged, and the pole group, at least one fracture area is constructed on the support piece, at least part of the fracture area is constructed as a thinning part, the thickness of the thinning part is smaller than that of the support piece main body part, and the thinning part is suitable for being broken when the second preset pressure value is used for conducting the accommodating cavity and the explosion-proof valve, wherein the second preset pressure value is smaller than the first preset pressure value.

The beneficial effects are that: through setting up support piece between shell and the utmost point group, support piece is located the holding chamber of shell, the inner wall butt of one side of support piece and the side of being provided with the explosion-proof valve of shell, and opposite side and utmost point group butt, support piece plays the effect of supporting between utmost point group and shell for have certain interval between utmost point group and the shell, simultaneously, through constructing the fracture district on support piece, the fracture is broken before the explosion-proof valve is opened to the portion of cutting off in fracture district, thereby the intercommunication explosion-proof valve with be provided with the holding chamber of utmost point group, increase exhaust space, be convenient for hold the gas in the chamber and can in time arrange the position department of explosion-proof valve, thereby guarantee that the gas in the battery can both in time discharge through the explosion-proof valve, guarantee the security of battery.

In an alternative embodiment, the thickness of the thinned portion is H1 and the thickness of the support body portion is H, wherein 0.05.ltoreq.H2.ltoreq.0.5.

The beneficial effects are that: the ratio range of the thickness H1 of the thinning part to the thickness H of the supporting main body is set between 0.05 and 0.5, so that the supporting piece can be ensured to have enough strength, deformation at the thinning part is avoided, overlarge strength of the thinning part can be avoided, and the thinning part can be ensured to be broken in time.

In an alternative embodiment, each of the fracture zones has at least two of the thinned portions disposed at intervals.

The beneficial effects are that: by arranging at least two thinning parts which are arranged at intervals, after the thinning parts are broken, the area between the at least two thinning parts can be integrally separated from the supporting main body, so that a breaking area with larger area is formed, the circulation space of gas is increased, the gas at the periphery of the supporting piece can flow into the exhaust channel more easily, and the gas can be discharged in time conveniently; and the mode that at least two thinned portions set up at intervals can reduce the size of every thinned portion to avoid the problem that the intensity of supporting the main part is not enough because of the size of single thinned portion is too big, thereby improve the stability of structure.

In an alternative embodiment, the support member includes a support body having a ring shape and an exhaust passage surrounded by the support body, the fracture zone is provided on the support body, and the thinned portion is connected between an inner ring and an outer ring of the support body.

The beneficial effects are that: the supporting main body plays the role of supporting between the pole group and the shell, a certain distance is guaranteed between the pole group and the shell, meanwhile, the exhaust channel is communicated with the space where the pole group is located and the explosion-proof valve, gas in the accommodating cavity is convenient to penetrate through, the exhaust area is increased, gas at the position where the pole group is located in the accommodating cavity can be timely discharged to the position where the explosion-proof valve is located through the exhaust channel, the thinning part is broken before the explosion-proof valve is opened, a notch is formed in the supporting main body, the space outside the periphery of the supporting piece and the exhaust channel can be communicated, gas outside the periphery of the supporting piece can be guaranteed to timely enter the exhaust channel, and then the gas at any position where the explosion-proof valve is located is discharged from the exhaust channel, so that the gas at any position in the battery can be timely discharged through the explosion-proof valve is guaranteed, and the safety of the battery is guaranteed.

In an alternative embodiment, the support member has a shape of a "back" and the support body has two first side portions located at both ends in the length direction of the support member and two second side portions located at both ends in the width direction of the support member.

The beneficial effects are that: the 'back' shape structure is convenient for processing and can be matched with the space in the shell.

In an alternative embodiment, one fracture zone is arranged on each first side, the fracture zone is provided with two thinning parts which are arranged at intervals, the distance between the two thinning parts is L1, and the dimension of the exhaust channel in the width direction is L, wherein, L1/L is more than or equal to 0.2 and less than or equal to 1.

The beneficial effects are that: the ratio range between the distance L1 between the two thinning parts and the dimension L of the exhaust channel along the width direction is set between 0.2 and 1, so that the cross section area of the channel for guiding the gas formed by the fracture area is large enough after the thinning parts are damaged, and the gas on the periphery of the support piece can smoothly enter the exhaust channel.

In an alternative embodiment, the support member has an explosion-proof corresponding area corresponding to the explosion-proof valve, the second side portion located in the explosion-proof corresponding area is provided with the fracture area, and the fracture area has at least two thinned portions arranged at intervals.

The beneficial effects are that: through the explosion-proof corresponding area corresponding to the explosion-proof valve on the support piece, and set up the fracture district on the second lateral part that is arranged in the explosion-proof corresponding area, after the portion of thinning in the fracture district breaks, the gas channel that forms on the fracture district can directly be with the gas water conservancy diversion of support piece periphery to the position department corresponding to the explosion-proof valve, has reduced gas water conservancy diversion distance to discharge the gas of support piece periphery as soon as possible, further improve the security of battery.

In an alternative embodiment, the distance between two adjacent thinned portions on the second side portion is L2, and the dimension of the explosion-proof valve along the length direction of the support member is L3, wherein 0.1+.l2/l3+.1.2.

The beneficial effects are that: the ratio range between the distance L2 between two adjacent thinning parts on the second side part and the length L3 of the explosion-proof valve is set between 0.8 and 1.2, so that the sufficient exhaust area can be formed after the fracture of the fracture area is ensured, and the effective support of the support main body on the pole group can be ensured.

In an alternative embodiment, the second side of the support body is configured with a plurality of protrusions extending toward the exhaust passage, and the plurality of protrusions on each of the second side are spaced apart along the length of the support member.

The beneficial effects are that: through set up the bulge on the second lateral part, increased the area of supporting the main part, guaranteed that support piece has better supporting property to the bulge size is less, can reduce the hindrance to exhaust passage exhaust as far as possible, makes support piece can satisfy support and exhaust demand simultaneously, can avoid utmost point group extrusion deformation, can guarantee again that the exhaust is unobstructed.

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 a partially enlarged schematic illustration of the explosion-proof counterpart of FIG. 8;

FIG. 11 is an enlarged partial schematic view of C in FIG. 8;

FIG. 12 is a side view of the support shown in FIG. 7;

FIG. 13 is a schematic view of the housing and explosion proof valve of an embodiment of the present invention;

fig. 14 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 first side portion; 3012. a second side portion; 3013. a protruding portion; 302. an exhaust passage; 303. a fracture zone; 3031. a thinning portion; 304. an explosion-proof corresponding area; 305. a limit part; 3051. a first limit part; 3052. 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 14.

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. A containing cavity is formed in the shell 1, an explosion-proof valve 101 is arranged on the side surface of the shell 1, and the explosion-proof valve 101 is suitable for being opened when a first preset pressure value is obtained; the pole group 2 is arranged in the accommodating cavity; the support 3 is located between the side of the casing 1 provided with the explosion-proof valve 101 and the pole group 2, at least one breaking zone 303 is configured on the support 3, at least part of the breaking zone 303 is configured as a thinned portion 3031, the thickness of the thinned portion 3031 is smaller than the thickness of the main body portion of the support 3, and the thinned portion 3031 is suitable for breaking at a second preset pressure value to conduct the accommodating cavity and the explosion-proof valve 101, wherein the second preset pressure value is smaller than the first preset pressure value.

According to the battery applying 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 piece 3 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 piece 3 is abutted against the pole group 2, the supporting piece 3 plays a role of supporting between the pole group 2 and the shell 1, so that a certain distance is reserved between the pole group 2 and the shell 1, meanwhile, the rupture area 303 is formed on the supporting piece 3, the thinned part 3031 of the rupture area 303 is ruptured before the explosion-proof valve 101 is opened, so that the explosion-proof valve 101 is communicated with the accommodating cavity provided with the pole group 2, the exhaust space is increased, and gas in the accommodating cavity can be discharged to the position of the explosion-proof valve 101 in time, so that the gas in the battery can be discharged through the explosion-proof valve 101 in time, and the safety of the battery is ensured.

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 first preset pressure value is a critical pressure value for opening the explosion-proof valve 101, the second pressure value is a critical pressure value for breaking the thinned portion 3031, the second pressure value is slightly smaller than the first pressure value, and the fact that the breaking area 303 breaks before the explosion-proof valve 101 is opened can be guaranteed by the fact that the second pressure value is smaller than the first pressure value; the projection of the fracture area 303 on the side surface of the shell 1 covers the explosion-proof valve 101, when the gas pressure in the battery is too high, the explosion-proof valve 101 is broken through by high-pressure gas, and the opened explosion-proof valve 101 can discharge the gas in the battery; the thickness of the thinned portion 3031 being smaller than the thickness of the main body portion of the support 3 means that the thickness of the thinned portion 3031 is smaller than the thickness of the solid portion of the support 3 other than the thinned portion 3031, the thickness of the thinned portion 3031 is smaller, and the thinned portion 3031 can be broken first at a portion other than the thinned portion 3031; the thickness refers to the dimension in the "thickness direction" indicated by the arrow in fig. 12, and also refers to the dimension in the "height direction" indicated by the arrow in fig. 3.

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 thickness of the thinned portion 3031 is H1 and the thickness of the main body portion of the support 3 is H, wherein 0.05.ltoreq.H2.ltoreq.0.5. As further shown in fig. 12, the smaller the thickness of the thinned portion 3031, the smaller the strength thereof, and if H1/H is smaller than 0.05, the thickness of the thinned portion 3031 is too small, making it difficult to manufacture, and the entire support member 3 has insufficient structural strength and is easily deformed at the thinned portion 3031; if H1/H is greater than 0.5, the thickness of the thinned portion 3031 is too large, the strength of the thinned portion 3031 is too high, the thinned portion 3031 cannot be damaged under the second preset pressure, the fracture region 303 cannot be broken in time, the structural function fails, the gas in the accommodating cavity cannot be discharged to the explosion-proof valve 101 in time, and the safety of the battery is reduced, so that the ratio of the thickness H1 of the thinned portion 3031 to the thickness H of the main body portion of the support member 3 is set to be between 0.05 and 0.5, the support member 3 can be ensured to have enough strength, deformation at the thinned portion 3031 is avoided, the strength of the thinned portion 3031 is prevented from being too large, and the thinned portion 3031 can be ensured to be broken in time.

In one embodiment, each break zone 303 has at least two thinned portions 3031 disposed at intervals therein. By arranging at least two thinning parts 3031 which are arranged at intervals, after the thinning parts 3031 are broken, the area between the at least two thinning parts 3031 can be integrally separated from the supporting piece 3, so that a breaking area 303 with larger area is formed, the circulation space of gas is increased, the gas in the accommodating cavity is more favorably discharged to the explosion-proof valve 101, and the gas is conveniently discharged in time; and the at least two thinning portions 3031 are disposed at intervals, the size of each thinning portion 3031 can be reduced, thereby avoiding the problem of insufficient strength of the support body 301 caused by the oversized size of the single thinning portion 3031, and improving the stability of the structure. Preferably, the number of the thinned portions 3031 in each break region 303 is two, facilitating processing.

In addition, in other embodiments, there may be only one thinned portion 3031 in each breaking region 303, the thinned portion 3031 may be provided with a larger size, and even the whole breaking region 303 may be provided as the thinned portion 3031, and after the thinned portion 3031 breaks, the whole area where the thinned portion 3031 is located serves as a gas passage to guide the gas in the accommodating chamber to the explosion-proof valve 101.

In one embodiment, the support 3 includes a support body 301 having a ring shape and an exhaust passage 302 surrounded by the support body 301, the fracture region 303 is disposed on the support body 301, the thinned portion 3031 is connected between an inner ring and an outer ring of the support body 301, the thickness of the thinned portion 3031 is smaller than that of the support body 301, and the thinned portion 3031 breaks to communicate with the outer circumference of the support 3 and the exhaust passage 302. The supporting body 301 plays a role in supporting between the pole group 2 and the shell 1, a certain distance is ensured between the pole group 2 and the shell 1, meanwhile, the 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 convenient to penetrate through, the exhaust area is increased, the gas at the position where the pole group 2 is located in the accommodating cavity is guaranteed to be discharged to the position where the explosion-proof valve 101 through the exhaust channel 302 in time, in addition, the thinned part 3031 can be communicated with the space outside the periphery of the supporting piece 3 and the exhaust channel 302 after the explosion-proof valve 101 is broken before the explosion-proof valve 101 is opened, the gas outside the periphery of the supporting piece 3 is guaranteed to timely enter the exhaust channel 302, and then the gas at the position where the explosion-proof valve 101 is located is discharged from the exhaust channel 302, so that the gas at any position in the battery can be discharged through the explosion-proof valve 101 in time, and the safety of the battery is guaranteed. It should be noted that, the supporting body 301 is a main body portion of the supporting member 3; the support body 301 is annular, the inner ring of the support body 301 refers to an annular ring near the center thereof, the outer ring refers to an annular ring far from the center thereof, and the outer circumference of the support 3 refers to a space of the annular outer ring facing in a direction far from the center of the annular ring; the projection of the vent channel 302 onto the side of the housing 1 covers the explosion proof valve 101.

In addition, in other embodiments, the support 3 only includes the support main body 301, the support 3 is a long support plate, the fracture region 303 is disposed on the plate-shaped support main body 301, the thinned portion 3031 is connected between two longer sides of the support 3, when the thinned portion 3031 breaks, the formed notch can communicate the region where the pole group 2 is located with the explosion-proof valve 101, and the gas in the accommodating cavity can be led to the explosion-proof valve 101, so that the gas is discharged out of the battery through the explosion-proof valve 101, and the safety of the battery is ensured.

In one embodiment, the support 3 has a "back" shape, and the support body 301 has two first side portions 3011 located at both ends in the length direction of the support 3 and two second side portions 3012 located at both ends in the width direction of the support 3. The longitudinal direction refers to the "longitudinal direction" indicated by the arrow in fig. 8, and the width direction refers to the "width direction" indicated by the arrow in fig. 8. The shape of the support piece 3 is matched with the side surface of the shell 1, on which the explosion-proof valve 101 is arranged, the structure in the shape of the Chinese character 'hui' is convenient to process, and the support piece can be matched with the space in the shell 1. Specifically, the supporting piece 3 can be formed by die cutting, so that the cost is low, and the forming is convenient.

In one embodiment, one breaking region 303 is provided on each first side portion 3011, the breaking region 303 has two thinned portions 3031 disposed at intervals, a distance between the two thinned portions 3031 is L1, and a dimension of the exhaust passage 302 in the width direction is L, wherein 0.2+.l1/l+.1. As further shown in fig. 9, the distance L1 between the two thinned portions 3031 refers to the center distance between the two thinned portions 3031, the dimension L of the exhaust channel 302 in the width direction is the distance between the two second side portions 3012, after the thinned portions 3031 break, the whole part between the two thinned portions 3031 falls off from the support body 301 to form a channel for guiding gas, the distance L1 between the two thinned portions 3031 does not exceed the dimension L of the exhaust channel 302 in the width direction at the maximum, if L1/L is smaller than 0.2, the distance between the two thinned portions 3031 is too small, the cross-sectional area of the channel for guiding gas is insufficient, the resistance of the gas on the periphery of the support member 3 entering the exhaust channel 302 is large, and the gas is unfavorable for discharging, so that the ratio between the distance L1 between the two thinned portions 3031 and the dimension L of the exhaust channel 302 in the width direction is set between 0.2 and 1, the cross-sectional area of the channel for guiding gas formed in the breaking region 303 can be ensured to be sufficiently large, and the support member 3 for guiding gas can be smoothly entered into the periphery of the exhaust channel 302 after the thinned portions 3031 are broken.

In one embodiment, the support 3 has an explosion-proof corresponding region 304 corresponding to the explosion-proof valve 101, and the second side 3012 located in the explosion-proof corresponding region 304 is provided with a breaking region 303, and the breaking region 303 has at least two thinned portions 3031 disposed at intervals. It should be noted that, the explosion-proof corresponding area 304 includes two second side portions 3012, each of the second side portions 3012 is provided with a breaking area 303, and the breaking area 303 is disposed on the second side portion 3012 located in the explosion-proof corresponding area 304 by the explosion-proof corresponding area 304 corresponding to the explosion-proof valve 101 on the support member 3, when the thinned portion 3031 in the breaking area 303 breaks, the gas channel formed on the breaking area 303 can directly guide the gas on the outer periphery of the support member 3 to the position corresponding to the explosion-proof valve 101, so that the gas guide distance is reduced, and the gas on the outer periphery of the support member 3 is discharged as soon as possible, thereby further improving the safety of the battery. Specifically, each explosion-proof valve 101 corresponds to one explosion-proof corresponding area 304, and the number of the breaking areas 303 in the explosion-proof corresponding area 304 may be plural, and the arrangement is not required.

In one embodiment, the distance between two adjacent thinned portions 3031 on the second side portion 3012 is L2, and the dimension of the explosion proof valve 101 along the length of the support 3 is L3, wherein 0.1.ltoreq.L2/L3.ltoreq.1.2. As further shown in fig. 8, 10 and 13, a distance L2 between two adjacent thinned portions 3031 in the explosion-proof corresponding region 304 is close to a length L3 of the explosion-proof valve 101, if a ratio of L2 to L3 is smaller than 0.1, the distance between the two adjacent thinned portions 3031 is too small, and when the thinned portions 3031 are damaged, an air inlet cross-sectional area formed in the fracture region 303 is insufficient, so that resistance of gas entering the exhaust channel 302 from the periphery of the support member 3 is large, which is not beneficial to gas discharge; if the ratio of L2 to L3 is greater than 1.2, a sufficient air intake area can be ensured, but the area of the portion of the broken area 303 that falls off is larger, the supporting portion of the counter electrode group 2 remaining in the supporting body 301 is reduced, the counter electrode group 2 cannot be effectively supported, the counter electrode group 2 is submerged, and there is a risk of the air exhaust channel 302, so that the range of the ratio between the distance L2 between the adjacent two thinned portions 3031 on the second side portion 3012 and the length L3 of the explosion-proof valve 101 is set between 0.1 and 1.2, which can ensure that a sufficient air exhaust area can be formed after the broken area 303 breaks, and can ensure effective support of the counter electrode group 2 by the supporting body 301.

In one embodiment, the second side 3012 of the support body 301 is configured with a plurality of protrusions 3013 extending toward the exhaust channel 302, the plurality of protrusions 3013 on each second side 3012 being spaced apart along the length of the support member 3. Through set up bulge 3013 on second lateral part 3012, increased the area of supporting body 301, guaranteed support piece 3 and had better supporting property to bulge 3013 size is less, can reduce the hindrance to exhaust passage 302 exhaust as far as possible, makes support piece 3 can satisfy support and exhaust demand simultaneously, can avoid utmost point group 2 extrusion deformation, can guarantee again that the exhaust is unobstructed.

In one embodiment, the protrusions 3013 on different sides are staggered. It should be noted that, different lateral parts refer to two second lateral parts 3012 that set up relatively along the width direction of support piece 3, through crisscross distribution between the bulge 3013 on two relative second lateral parts 3012, avoid two bulge 3013 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 3013 direct opposite set up, crisscross distribution between the bulge 3013 can suitably increase the bulge 3013 along the size of width direction, also can not influence the unobstructed nature of exhaust, still increase the holding area simultaneously, make support piece 3 support to polar group 2 more effective.

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. 3, the thickness of the supporting member 3 determines the distance between the pole group 2 and the housing 102, and 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 3013 is configured to be one or more of semi-circular, triangular, rectangular, trapezoidal. The shape has simple structure, convenient processing and low manufacturing cost. Specifically, when the shape of the protruding portion 3013 is configured to be one or more of triangular, rectangular, and trapezoidal, corners of the shape are configured to be smoothly transited arc lines to reduce stress and improve stability.

In one embodiment, the support body 301 further comprises: at least one limiting portion 305, the limiting portion 305 is supported between the two second side portions 3012. Through setting up spacing portion 305 and supporting two second lateral parts 3012 of supporting body 301 in the inside of supporting body 301, 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. Note that, the limiting portion 305 and the supporting body 301 are integrally formed, and may be formed by die cutting; at least one limiting part 305 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 305 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 305 includes a first limiting portion 3051 and a second limiting portion 3052, a first end of the first limiting portion 3051 is connected with one side of the inner ring of the supporting body 301, a first end of the second limiting portion 3052 is connected with the other side of the inner ring of the supporting body 301, and a second end of the first limiting portion 3051 and a second end of the second limiting portion 3052 are close to each other, so that a supporting effect of the whole limiting portion 305 on the supporting body 301 is guaranteed.

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, as further shown in connection with fig. 5 and 14, the housing 1 further includes an insulating protective film 104, and the insulating protective 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.

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:

a housing, in which a receiving chamber is formed, the side of which is provided with an explosion-proof valve adapted to be opened at a first preset pressure value;

a pole group disposed in the accommodation chamber;

the support piece is positioned between the side surface of the shell, on which the explosion-proof valve is arranged, and the pole group, at least one fracture area is constructed on the support piece, at least part of the fracture area is constructed as a thinning part, the thickness of the thinning part is smaller than that of the support piece main body part, and the thinning part is suitable for being broken when the second preset pressure value is used for conducting the accommodating cavity and the explosion-proof valve, wherein the second preset pressure value is smaller than the first preset pressure value.

2. The battery of claim 1, wherein the thickness of the thinned portion is H1 and the thickness of the support body portion is H, wherein 0.05 ∈h1/H ∈0.5.

3. The battery of claim 2, wherein each of said break zones has at least two of said thinned portions disposed in spaced relation.

4. A battery according to any one of claims 1 to 3, wherein the support member includes a support body having a ring shape and an exhaust passage surrounded by the support body, the fracture zone is provided on the support body, and the thinned portion is connected between an inner ring and an outer ring of the support body.

5. The battery of claim 4, wherein the support member has a "back" shape, and the support body has two first side portions at both ends in a length direction of the support member and two second side portions at both ends in a width direction of the support member.

6. The battery according to claim 5, wherein one of the breaking areas is provided on each of the first side portions, the breaking area has two thinned portions provided at intervals, a distance between the two thinned portions is L1, and a dimension of the exhaust passage in the width direction is L, wherein 0.2.ltoreq.l1/l.ltoreq.1.

7. The battery of claim 5, wherein the support has an explosion-proof counterpart region thereon corresponding to the explosion-proof valve, the rupture region being provided on the second side portion in the explosion-proof counterpart region, the rupture region having at least two thinned portions disposed at intervals.

8. The battery according to claim 7, wherein a distance between adjacent two of the thinned portions on the second side portion is L2, and a dimension of the explosion-proof valve in a length direction of the support member is L3, wherein 0.1+.l2/l3+.1.2.

9. The battery of claim 5, wherein the second side of the support body is configured with a plurality of protrusions extending toward the exhaust passage, the plurality of protrusions on each of the second side being spaced apart along the length of the support.

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