Battery, battery pack and electric device

Abstract

The utility model provides a battery, a battery pack and a power utilization device, and relates to the technical field of batteries, and the provided battery comprises a shell, a top cover, an anti-explosion valve, a motor assembly, an insulating film and a bottom supporting plate; the shell is provided with a containing cavity, an opening and an explosion-proof opening; the top cover is used for covering the opening; the anti-explosion valve is mounted at the anti-explosion opening; the electrode assembly and the insulating film are arranged in the accommodating cavity; the insulating film wraps the electrode assembly; the bottom supporting plate is arranged in the containing cavity and located on the side, facing the anti-explosion valve, of the insulating film. The bottom supporting plate comprises a first bottom supporting plate and a second bottom supporting plate, the first bottom supporting plate and the second bottom supporting plate are oppositely arranged in the plane perpendicular to the height of the shell, and at least one exhaust hole is formed in the first bottom supporting plate and / or the second bottom supporting plate. The provided battery pack comprises the battery, and the electric device comprises the battery or the battery pack. According to the battery provided by the invention, gas can be quickly guided to the anti-explosion valve when thermal runaway of the battery occurs, so that the technical effects of protecting the battery and preventing the battery from being damaged are achieved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery, a battery pack, and an electrical device. Background Art

[0002] The application areas of power batteries mainly include electric vehicles, electric two-wheeled vehicles, electric ships, drones, etc. The battery pack includes multiple battery cells. The structure of each battery cell mainly includes a top cover, a shell (usually an aluminum shell), an electrode assembly (usually a coil) and an insulating film. An opening is provided on the surface of one side of the shell. The electrode assembly is wrapped with an insulating film and placed into the shell through the opening. The top cover is used to cover the opening at the top of the shell and is welded to the shell to form a sealed whole. When the temperature inside the power battery is too high or the pressure is too high, the battery will undergo an internal chemical reaction, thereby generating gas, causing the pressure inside the battery to continue to increase, causing damage to the battery. In the most serious cases, it will cause the battery to explode. To avoid such a situation, an explosion-proof valve is configured in the power battery. The function of this valve is to disperse the pressure generated inside the battery to the outside world, thereby ensuring the safety of the battery.

[0003] When the battery's explosion-proof valve is installed on the top cover, it is prone to dual failure of electrical insulation and thermal runaway when the battery is abused or in extreme conditions. As the safety performance requirements for power batteries gradually increase, in order to avoid and reduce the risk of dual failure of this design scheme, the design of thermal and electric separation is becoming more and more common.

[0004] In existing thermal-electric separation designs, the typical design removes the explosion-proof valve from the top cover and relocates it to the bottom of the housing. This ensures that electrical connections and thermal runaway eruptions do not interfere with each other in the event of battery abuse. However, placing an explosion-proof valve at the bottom of the housing presents the following issues: the weight of the electrode assembly (winding core) causes the bottom of the insulating film to cling to the inner surface of the housing, potentially blocking the explosion-proof valve opening and affecting its pressure relief function, posing a safety hazard. Utility Model Content

[0005] The present application provides a battery, a battery pack and an electrical device, which alleviates the technical problem in the prior art that an explosion-proof valve is provided at the bottom of the shell of the above-mentioned battery cell, and the bottom of the insulating film is tightly attached to the inner surface of the shell due to the weight of the electrode assembly (winding core), causing the explosion-proof valve port to be blocked, thereby affecting the pressure relief function of the explosion-proof valve, thereby achieving the technical effect of protecting the battery cell.

[0006] To achieve the above objectives, the main technical solutions adopted in the embodiments of the present application include:

[0007] In a first aspect, an embodiment of the present application provides a battery having a height dimension, comprising a housing, a top cover, an explosion-proof valve, a motor assembly, an insulating film, and a bottom support plate; the housing having a housing cavity, an opening provided on one end surface of the housing along the height dimension, and an explosion-proof opening provided on the end surface of the housing facing away from the opening; the top cover is used to seal the opening; the explosion-proof valve is mounted in the explosion-proof opening; the electrode assembly and the insulating film are disposed in the housing cavity; the insulating film wraps the electrode assembly; the bottom support plate is disposed in the housing cavity, and the bottom support plate is located on the side of the insulating film facing the explosion-proof valve. The bottom support plate comprises a first bottom support plate and a second bottom support plate, the first bottom support plate and the second bottom support plate being disposed opposite each other in a plane perpendicular to the height dimension, and at least one vent hole is provided on the first bottom support plate and / or the second bottom support plate ("and / or" includes both the first bottom support plate and the second bottom support plate, or only the first bottom support plate, or only the second bottom support plate).

[0008] The battery provided in an embodiment of the present application has two opposing bottom support plates (a first bottom support plate and a second bottom support plate) disposed therein, with the side of the first bottom support plate facing the second bottom support plate being the first side, and the side of the second bottom support plate facing the first bottom support plate being the second side. Thus, a splicing gap or gap can be formed between the first side of the first bottom support plate and the second side of the second bottom support plate. When the battery experiences thermal runaway, high-pressure ejecta are generated within the battery. If these high-pressure ejecta are not promptly discharged through the explosion-proof valve, they may cause the battery to explode. The splicing gap or gap formed between the first side of the first bottom support plate and the second side of the second bottom support plate causes the battery to experience thermal runaway. In addition to being able to be exhausted through the exhaust holes on the first and second bottom support plates, a large amount of high-pressure and high-temperature gas can also impact the gap or gap between the first side of the first bottom support plate and the second side of the second bottom support plate, thereby rapidly directing the gas toward the explosion-proof valve from the gap or gap, thereby achieving the technical effect of protecting the battery and preventing damage to the battery.

[0009] It should be understood that when the first side of the first bottom support plate and the second side of the second bottom support plate are spaced apart from each other and are relatively far apart, the gas can be quickly guided to the explosion-proof valve for exhaust. When the joint gap between the first side of the first bottom support plate and the second side of the second bottom support plate is relatively small, the interval or gap will act as a weak part with relatively weak strength and will quickly expand and tear around under the impact of high-pressure gas, so as to quickly tear out the pressure relief port, thereby guiding the gas to the explosion-proof valve.

[0010] In addition, the first bottom support plate and the second bottom support plate are arranged relative to each other in a plane perpendicular to the height of the shell, which does not mean that the respective plate surfaces of the first bottom support plate and the second bottom support plate must also extend in a direction perpendicular to the height of the shell. In fact, the respective plate surfaces of the first bottom support plate and the second bottom support plate can be parallel to or slightly inclined to the inner surface of the shell where the explosion-proof valve is provided, and the first bottom support plate and the second bottom support plate can be flat or uneven.

[0011] Optionally, the battery further has a length direction perpendicular to the height direction, and the first and second bottom supporting plates are arranged opposite each other along the length direction. The length of the housing is L, the length of the first bottom supporting plate is L1, and the length of the second bottom supporting plate is L2. Therefore, 1 mm ≤ L1 ≤ L / 2, and 1 mm ≤ L2 ≤ L / 2. Arranging the first and second bottom supporting plates opposite each other along the length direction X of the battery facilitates rapid installation and positioning of the first and second bottom supporting plates within the battery.

[0012] Optionally, the first and second bottom supporting plates each include a main body and a weakened portion provided on the main body. Along the height direction, the weakened portion is thinner than the main body, and at least a portion of the orthographic projection of the weakened portion on the surface of the housing on the side where the explosion-proof valve is provided overlaps with the explosion-proof valve. The provision of the weakened portion reduces the structural strength of each of the two bottom supporting plates. When a battery experiences thermal failure, a large amount of high-pressure gas will impact the weakened portion, rapidly discharging the high-pressure gas to the explosion-proof valve.

[0013] Optionally, along the height direction, the weak portion is a groove or a tooth line provided on the body.

[0014] Optionally, the weak portion of the first bottom supporting plate extends to a side edge of the first bottom supporting plate, and the weak portion of the second bottom supporting plate extends to a side edge of the second bottom supporting plate.

[0015] Optionally, the weakened portion includes a first edge groove and a second edge groove, wherein the first edge groove is provided on an edge of the first bottom support plate facing the second bottom support plate, and the second edge groove is provided on an edge of the second bottom support plate facing the first bottom support plate, with the first edge groove and the second edge groove opening facing each other to form a butted weakened portion. In this way, when impacted by the high-pressure gas inside the battery, the weakened portion will be quickly torn from the edge of the single bottom support plate, thereby further improving the pressure relief effect.

[0016] Optionally, at least part of the orthographic projection of the weak docking portion on the surface of the shell on the side where the explosion-proof valve is provided coincides with the explosion-proof valve, which can reduce the circumferential flow time of the high-pressure gas and create more favorable conditions for the high-pressure gas to be quickly ejected from the explosion-proof valve.

[0017] Optionally, the orthographic projection of the butt joint weak portion on the surface of the shell on which the explosion-proof valve is provided covers the entire explosion-proof valve; or, the edge of the butt joint weak portion is aligned with the edge of the explosion-proof valve; or, the orthographic projection of the butt joint weak portion on the surface of the shell on which the explosion-proof valve is provided partially overlaps with the explosion-proof valve.

[0018] Optionally, the cross-section of the first side groove perpendicular to the height direction is any one of a U-shape, a C-shape, a V-shape, a trapezoid, a rectangle, or a triangle; and / or the cross-section of the second side groove perpendicular to the height direction is any one of a U-shape, a C-shape, a V-shape, a trapezoid, a rectangle, or a triangle. ("and / or" indicates that the cross-sectional shapes of the first side groove and the second side groove may be the same or different).

[0019] Optionally, an edge of the body of the first bottom supporting plate facing the second bottom supporting plate is flush with an edge of the body of the second bottom supporting plate facing the first bottom supporting plate.

[0020] Optionally, the first bottom support plate and the second bottom support plate are arranged opposite to each other along the length direction of the battery; the first side groove and the second side groove respectively include a first trough body side and a second trough body side that are opposite to each other along the width direction of the battery; along the length direction of the battery, the length of the first trough body side is different from the length of the second trough body side, and the longer side of the two is the first trough body side, and the other side is the second trough body side, then, the first trough body side of the first bottom support plate is opposite to the second trough body side of the second bottom support plate, and the second trough body side of the first bottom support plate is opposite to the first trough body side of the second bottom support plate.

[0021] Optionally, one side edge of the first bottom support plate facing the second bottom support plate and one side edge of the second bottom support plate facing the first bottom support plate satisfy the following requirements: at least some areas are spaced apart from each other; when the battery suffers thermal failure, a portion of the high-pressure gas can be quickly guided to the explosion-proof valve for exhaust through the space, so that the battery enters the pressure relief mode in time.

[0022] Optionally, a side edge of the first bottom supporting plate facing the second bottom supporting plate and a side edge of the second bottom supporting plate facing the first bottom supporting plate satisfy the following conditions: at least partial areas abut or overlap each other.

[0023] It should be understood that although the first side and the second side are in contact with or overlap each other, because the first bottom support plate and the second bottom support plate are two different individual bottom support plates separated from each other, there will still be a corresponding gap (which may be relatively small) between the two bottom support plates. This gap still destroys the structural strength of the overall bottom support plate composed of the two bottom support plates. When high-pressure gas impacts this gap, it can still be quickly torn from the gap. Moreover, even if the first side and the second side are overlapped with each other as a stacked structure, it can still be torn from the upper gap to the lower gap. In this way, regardless of whether there are weak parts on the first bottom support plate and the second bottom support plate to assist in pressure relief, at least the pressure relief can be achieved by tearing through the gap. Combined with the auxiliary pressure relief of the exhaust hole, a certain pressure relief function can also be achieved.

[0024] Optionally, a first overlapping edge is provided on the side of the first bottom support plate facing the second bottom support plate, and along the height direction, the thickness of the first overlapping edge is less than the thickness of the body of the first bottom support plate; a second overlapping edge is provided on the side of the second bottom support plate facing the first bottom support plate, and along the height direction, the thickness of the second overlapping edge is less than the thickness of the body of the second bottom support plate; the first overlapping edge and the second overlapping edge overlap each other. At least it can: (1) reduce the structural strength of the overlap between the first bottom support plate and the second bottom support plate, so that when high-pressure gas impacts the gap between the two bottom support plates, it can easily tear and release the pressure from the gap; (2) reduce the overall thickness of the overlap between the first bottom support plate and the second bottom support plate, avoid occupying too much housing space of the shell, and help reduce the external volume of the battery to meet the application requirements of more scenarios for batteries with smaller volumes; (3) reduce the processing accuracy of the length of the two bottom support plates, and avoid the problem of material waste caused by processing errors that cause a single bottom support plate to be slightly longer and unable to be installed. It should be understood that this does not mean that the embodiment of the overlap between the two bottom support plates can only be applied when the length of a single bottom support plate along the length direction of the battery is longer than 1 / 2 of the shell length. When the length of the two bottom support plates is less than or equal to 1 / 2 of the shell length, the overlap scheme can still be used.

[0025] Optionally, one side edge of the first bottom support plate facing the second bottom support plate is connected to one side edge of the second bottom support plate facing the first bottom support plate by heat melting, or connected via a positioning hole provided in one and a positioning column provided in the other.

[0026] In a second aspect, an embodiment of the present application provides a battery pack comprising the battery described in any one of the aforementioned embodiments.

[0027] In a third aspect, an embodiment of the present application further provides an electrical device, which includes the battery provided by any optional embodiment of the first aspect or the battery pack provided by the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 A schematic diagram of the overall structure of the battery provided in an embodiment of the present application;

[0030] Figure 2 An exploded schematic diagram of the overall structure of a battery provided in an embodiment of the present application from one perspective;

[0031] Figure 3 This is a schematic diagram of the overall structure explosion from another perspective of the battery provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of an optional structure in which the first bottom supporting plate and the second bottom supporting plate of the insulating film are spaced apart from each other in the battery provided in an embodiment of the present application;

[0033] Figure 5 A schematic diagram of an optional structure in which the first bottom supporting plate and the second bottom supporting plate of the insulating film are overlapped with each other in the battery provided in an embodiment of the present application;

[0034] Figure 6 This is a cross-sectional view of the local structure of area A in Figure 5;

[0035] Figure 7-11 Schematic diagrams of optional structures of weak parts on the first bottom support plate or the second bottom support plate in the battery provided in the embodiments of the present application.

[0036] Icon: 100-battery; 1-shell; 101-first end face; 11-accommodating chamber; 111-opening; 112-explosion-proof vent; 2-top cover; 3-electrode assembly; 4-insulating film; 5-bottom support plate; 51-first bottom support plate; 5101-first side edge; 5101′-first overlapping edge; 5102-positioning hole; 511-first edge groove; 52-second bottom support plate; 5201-second side edge; 5201′-second overlapping edge; 5202-positioning column; 521-second edge groove; 501-weak part; 5011-first trough body side edge; 5012-second trough body side edge; 502-main body; 503-jointing weak part; 504-exhaust hole; 6-explosion-proof valve; Z-height direction; X-length direction; Y-width direction. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0039] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0041] The term "plurality" used in this application refers to two or more (including two).

[0042] In the related art, when the explosion-proof valve 6 of the power battery 100 is installed on the top cover 2, when the battery 100 is abused or in extreme conditions, dual failure of electrical insulation and thermal runaway is likely to occur. As the safety performance requirements of the power battery 100 gradually increase, in order to avoid and reduce the risk of dual failure of this design scheme, the design of thermoelectric separation is becoming more and more common.

[0043] A typical thermal-electric separation design eliminates the explosion-proof valve 6 from the top cover 2 and relocates it to the bottom of the housing 1. This ensures that the electrical connection and thermal runaway eruption do not interfere with each other in the event of battery 100 abuse. However, placing the explosion-proof valve 6 at the bottom of the housing 1 presents the following issues: the bottom of the insulating film 4, due to the weight of the electrode assembly 3 (winding core), clogs the explosion-proof valve 6, affecting its pressure relief function and posing a safety hazard.

[0044] In view of this, this embodiment provides a battery 100, referring to Figure 1 The battery 100 has a height direction Z, a length direction X perpendicular to the height direction Z, and a width direction Y also perpendicular to the height direction Z and perpendicular to the length direction X.

[0045] Specifically, refer to Figures 1 to 3 The battery 100 includes a shell 1, a top cover 2, an explosion-proof valve 6, an electrode assembly 3, an insulating film 4 and a bottom support plate 5; the shell 1 has a accommodating cavity 11, and along the height direction Z, one end surface of the shell 1 is provided with an opening 111, and the other end surface of the shell 1 opposite to the opening 111 is provided with an explosion-proof opening 112; the top cover 2 is used to cover the opening 111 of the shell 1; the explosion-proof valve 6 is installed in the explosion-proof opening of the shell 1 (the explosion-proof valve 6 is installed on the first end surface 101 of the shell 1); the electrode assembly 3 and the insulating film 4 are arranged in the accommodating cavity 11 of the shell 1; the insulating film 4 wraps the electrode assembly 3; the bottom support plate 5 is also arranged in the accommodating cavity 11 of the shell 1, and the bottom support plate 5 is located on the side of the insulating film 4 facing the explosion-proof valve 6.

[0046] Reference Figures 1 to 6 The bottom support plate 5 includes a first bottom support plate 51 and a second bottom support plate 52. The first bottom support plate 51 and the second bottom support plate 52 are arranged opposite to each other in a plane perpendicular to the height direction Z. At least one exhaust hole 504 is provided on the first bottom support plate 51 and / or the second bottom support plate 52 ("and / or" means that the exhaust holes 504 are provided on both the first bottom support plate 51 and the second bottom support plate 52, or the exhaust holes 504 are provided only on the first bottom support plate 51, or the exhaust holes 504 are provided only on the second bottom support plate 52).

[0047] The battery 100 provided in the embodiment of the present application is internally provided with two oppositely arranged bottom support plates (a first bottom support plate 51 and a second bottom support plate 52), with the side of the first bottom support plate 51 facing the second bottom support plate 52 being the first side 5101, and the side of the second bottom support plate 52 facing the first bottom support plate 51 being the second side 5201, so that a splicing interval or gap can be formed between the first side 5101 of the first bottom support plate 51 and the second side 5201 of the second bottom support plate 52. When the battery 100 experiences thermal runaway, there are high-pressure ejecta inside the battery 100. If these high-pressure ejecta are not discharged from the explosion-proof valve 6 in time, the battery 100 may explode. The splicing interval or gap formed between the first side 5101 of the first bottom support plate 51 and the second side 5201 of the second bottom support plate 52 causes the battery 100 to experience thermal runaway. In addition to exhausting through the exhaust holes 504 on the first bottom support plate 51 and the second bottom support plate 52, a large amount of high-pressure and high-temperature gas can also impact the interval or gap between the first side 5101 of the first bottom support plate 51 and the second side 5201 of the second bottom support plate 52, and quickly guide the gas to the explosion-proof valve 6 from the interval or gap, thereby achieving the technical effect of protecting the battery 100 and preventing the battery 100 from being damaged.

[0048] It should be understood that when the first side 5101 of the first bottom support plate 51 and the second side 5201 of the second bottom support plate 52 are spaced apart from each other and relatively far apart, the gas can be quickly guided to the explosion-proof valve 6 for exhaust. When the joint gap between the first side 5101 of the first bottom support plate 51 and the second side 5201 of the second bottom support plate 52 is relatively small, the interval or gap will act as a weak part 501 with relatively weak strength and will quickly expand and tear to the surroundings under the impact of high-pressure gas, so as to quickly tear out the pressure relief port, thereby guiding the gas to the explosion-proof valve 6.

[0049] In addition, it should be noted that, in this embodiment, the first bottom support plate 51 and the second bottom support plate 52 are arranged relative to each other in a plane perpendicular to the height direction Z, which does not mean that the respective plate surfaces of the first bottom support plate 51 and the second bottom support plate 52 must also extend along a plane perpendicular to the height direction Z. In fact, the respective plate surfaces of the first bottom support plate 51 and the second bottom support plate 52 can be parallel to or slightly inclined to the inner surface of the explosion-proof valve 6 of the shell 1, and the first bottom support plate 51 and the second bottom support plate 52 can be flat or uneven, and this application does not impose any specific restrictions.

[0050] In addition, the first bottom support plate 51 and the second bottom support plate 52 are arranged relative to each other in a plane perpendicular to the height direction Z, which does not mean that the first bottom support plate 51 and the second bottom support plate 52 need to be symmetrical with each other in geometric shape. The shapes of the first bottom support plate 51 and the second bottom support plate 52 can be different. The first side 5101 of the first bottom support plate 51 and the second side 5201 of the second bottom support plate 52 can be a flush "1" shape, or an "S" shape, a "V" shape, a "C" shape or any other shape.

[0051] Optionally, the first bottom support plate 51 and the second bottom support plate 52 can be arranged relative to each other along the length direction X of the battery 100 or along the width direction Y of the battery 100. In a specific embodiment of the present application, referring to Figure 2 The first and second bottom supporting plates 51 and 52 are positioned opposite each other along the length direction X of the battery 100. With the length of the upper housing 1 in the length direction X being L, the length of the first and second bottom supporting plates 51 being L1, and the length of the second and second bottom supporting plates 52 being L2, the following conditions are satisfied: 1 mm ≤ L1 ≤ L / 2, and 1 mm ≤ L2 ≤ L / 2. Positioning the first and second bottom supporting plates 51 and 52 opposite each other along the length direction X of the battery 100 facilitates rapid installation and positioning of the first and second bottom supporting plates 51 and 52 within the battery 100.

[0052] In a specific embodiment of the present application, the first bottom support plate 51 and the second bottom support plate 52 respectively include a main body 502 and a weak portion 501 provided on the main body 502. Along the height direction Z, the thickness of the weak portion 501 is less than the thickness of the main body 502, and the positive projection of at least part of the weak portion 501 on the surface of one side of the shell 1 where the explosion-proof valve 6 is provided (i.e., the first end face 101) coincides with the explosion-proof valve 6.

[0053] The first bottom support plate 51 and the second bottom support plate 52 are provided with a weak portion 501, which is equivalent to reducing the structural strength of the two bottom support plates. Figure 7 As shown, the bottom support plate 5 is penetrated along the height direction Z of the battery 100, that is, a large through-hole structure. In other specific embodiments, the weak portion 501 partially penetrates the bottom support plate 5 and partially does not penetrate the bottom support plate 5. For example, Figure 9 As shown, a groove is first provided on the body 502, and then a toothed line is provided inside the groove. In these two embodiments, when the battery 100 fails due to heat, a large amount of high-pressure gas will easily flow out from the weak portion 501. When the flow rate of high-pressure gas is relatively large, it can also tear the edge of the through hole of the weak portion 501 and flow out quickly. In some specific embodiments, the weak portion 501 is as shown in FIG. Figure 8The bottom support plate 5 is shown as non-through along the height direction Z of the battery 100, for example, as a groove provided in the body 502. When the battery 100 experiences thermal failure, a large amount of high-pressure gas will impact the weak portion 501. Because the weak portion 501 undermines the structural integrity of the single bottom support plate, it will be easily torn apart by the impact of the high-pressure gas, thereby quickly discharging the high-pressure gas to the explosion-proof valve 6. In the embodiment of the present application, the weak portion 501 can be an uninterrupted continuous structure or a discontinuous structure consisting of multiple intermittent thin-walled areas or holes.

[0054] There are many optional specific shapes for the cross section of the weak portion 501 of a single bottom support plate perpendicular to the height direction Z. For example, in a specific embodiment, Figure 7 and Figure 8 As shown, the cross section of the weak portion 501 is a "U"-shaped structure provided on a single bottom support plate. When it is arranged opposite to another single bottom support plate, if it can be positioned opposite to the weak portion 501 of the other single bottom support plate, a larger elliptical structure will be formed. In a specific embodiment, as shown in FIG. Figure 10 As shown, the cross section of the weak portion 501 is a "T"-shaped structure provided on a single bottom support plate. When it is arranged opposite to another single bottom support plate, if it can be positioned opposite to the weak portion 501 of the other single bottom support plate, an "I"-shaped structure will be formed. In a specific embodiment, as shown in FIG. Figure 11 As shown, the cross-section of the weak portion 501 is a "V"-shaped structure provided on a single bottom support plate. When the weak portion 501 is arranged opposite to another single bottom support plate, if it can be positioned opposite to the weak portion 501 of the other single bottom support plate, an "X"-shaped structure will be formed. The cross-section of the weak portion 501 can also be configured to imitate the shape of the explosion-proof valve 6 or other shapes. The number of weak portions 501 provided on a single bottom support plate can be one, two, or more, and this application does not impose any restrictions.

[0055] Due to the provision of the above-mentioned weak portion 501, in addition to the exhaust holes 504 on a single bottom support plate and the gap or gap between two bottom support plates, the high-pressure gas can also be diverted through the weak portion 501, thereby further improving the pressure relief effect.

[0056] In an optional embodiment of the present application, Figure 7 and Figure 8As shown, the weak portion 501 of the first bottom support plate 51 extends to one side edge of the first bottom support plate 51, and the weak portion 501 of the second bottom support plate 52 extends to one side edge of the second bottom support plate 52. In other words, a portion of the edge of the weak portion 501 is the edge of a single bottom support plate. In this way, when the weak portion 501 is impacted by the high-pressure gas inside the battery 100, it will be quickly torn from the edge of the single bottom support plate to further improve the pressure relief effect. It should be understood that when the weak portion 501 is completely surrounded by the body 502, that is, when the edges of the weak portion 501 have a relatively high structural strength, the first location to rupture under the impact of the high-pressure gas can only be from the inside of the weak portion 501. Obviously, it is easier to tear directly from the edge of the weak portion 501.

[0057] In an alternative embodiment, if Figure 7 or Figure 8 As shown, the above-mentioned weak portion 501 includes a first side groove 511 and a second side groove 521. The first side groove 511 is provided on one side edge of the first bottom supporting plate 51 facing the second bottom supporting plate 52, and the second side groove 521 is provided on one side edge of the second bottom supporting plate 52 facing the first bottom supporting plate 51. The first side groove 511 and the second side groove 521 are opened opposite to each other to form a butt-jointed weak portion 503. The first side groove 511 and the second side groove 521 can be as follows: Figure 7 The through hole structure that penetrates a single bottom support plate along the height direction Z shown in FIG. Figure 8 The groove structure shown in the figure does not penetrate a single bottom support plate along the height direction Z, and the cross-sectional shapes of the first side groove 511 and the second side groove 521 along the vertical direction Z are not limited to being as shown in FIG. Figure 7 and Figure 8 The "U" shape shown can also be a "C" shape, a "V" shape, a trapezoid, a rectangle or a triangle or other optional shapes, and the two shapes can be the same or different, and this application does not make specific restrictions.

[0058] The butt joint weak portion 503 can be arranged at a position away from the explosion-proof valve 6. After the high-pressure gas flows out from the weak portion 501, it flows toward the explosion-proof valve 6 along the gap between the bottom support plate 5 and the inner wall of the shell 1. The orthographic projection of at least a portion of the butt joint weak portion 503 on the surface of the side of the shell 1 where the explosion-proof valve 6 is provided can also coincide with the explosion-proof valve 6. Among them, when the orthographic projection of at least a portion of the butt joint weak portion 503 on the surface of the side of the shell 1 where the explosion-proof valve 6 is provided coincides with the explosion-proof valve 6, the circumferential flow time of the high-pressure gas can be saved, creating more favorable conditions for the high-pressure gas to be quickly ejected from the explosion-proof valve 6.

[0059] In one specific embodiment, the orthographic projection of the aforementioned butt joint weak portion 503 on the surface of the housing 1 on which the explosion-proof valve 6 is provided (i.e., the first end face 101) covers the entire explosion-proof valve 6; in one specific embodiment, the edge of the aforementioned butt joint weak portion 503 is aligned with the edge of the explosion-proof valve 6 (i.e., the orthographic projection of the edge of the aforementioned butt joint weak portion 503 on the surface of the housing 1 on which the explosion-proof valve 6 is provided (i.e., the first end face 101) completely overlaps with the explosion-proof valve 6); in one specific embodiment, the orthographic projection of the aforementioned butt joint weak portion 503 on the surface of the housing 1 on which the explosion-proof valve 6 is provided (i.e., the first end face 101) partially overlaps with the explosion-proof valve 6. When the orthographic projection of the aforementioned butt joint weak portion 503 on the surface of the housing 1 on which the explosion-proof valve 6 is provided (i.e., the first end face 101) covers the entire explosion-proof valve 6, or when the edge of the aforementioned butt joint weak portion 503 is aligned with the edge of the explosion-proof valve 6, the rapid diversion effect on high-pressure gas is more prominent.

[0060] In a specific embodiment of the present application, the edge of the main body 502 of the first bottom support plate 51 facing the second bottom support plate 52 (i.e., the first side 5101) and the edge of the main body 502 of the second bottom support plate 52 facing the first bottom support plate 51 (i.e., the second side 5201) are flush, that is, the connecting edges of the two are relatively flat, similar to the flat edge structure of an "I" shape.

[0061] In another specific embodiment of the present application, the edge of the body 502 on the side of the first bottom supporting plate 51 facing the second bottom supporting plate 52 (i.e., the first side 5101) and the edge of the body 502 on the side of the second bottom supporting plate 52 facing the first bottom supporting plate 51 (i.e., the second side 5201) are in a stepped shape that intersects each other. Figure 5As shown, the first bottom supporting plate 51 and the second bottom supporting plate 52 are arranged opposite to each other along the length direction of the battery 100; the first side groove 511 and the second side groove 521 respectively include a first trough body side 5011 and a second trough body side 5012 opposite to each other along the width direction of the battery 100; along the length direction of the battery 100, the length of the first trough body side 5011 is different from the length of the second trough body side 5012, and the longer side of the two is the first trough body side 5011, and the other side is the second trough body side 5012, then, the first trough body side 5011 of the first bottom supporting plate 51 is opposite to the second trough body side 5012 of the second bottom supporting plate 52, and the second trough body side 5012 of the first bottom supporting plate 51 is opposite to the first trough body side 5011 of the second bottom supporting plate 52. That is to say, the first side 5101 of the first bottom support plate 51 and the second side 5201 of the second bottom support plate 52 respectively include a long side and a short side, the long side of the first bottom support plate 51 is opposite to the short side of the second bottom support plate 52, and the short side of the first bottom support plate 51 is opposite to the long side of the second bottom support plate 52. In this way, when the first bottom support plate 51 and the second bottom support plate 52 are placed relative to each other, an interlaced limit can be formed in the width direction of the battery 100 to avoid mutual misalignment of the first bottom support plate 51 and the second bottom support plate 52, thereby avoiding affecting the mutual docking of the first side groove 511 and the second side groove 521, and ensuring that the docking weak portion 503 is accurately aligned, which will play an important role when the initial design of the docking weak portion 503 needs to correspond to the position of the explosion-proof valve 6.

[0062] Regarding the relative positional relationship between the edge of the main body 502 on the side of the first bottom supporting plate 51 facing the second bottom supporting plate 52 (i.e., the first side 5101) and the edge of the main body 502 on the side of the second bottom supporting plate 52 facing the first bottom supporting plate 51 (i.e., the second side 5201), specifically:

[0063] In a specific embodiment of the present application, one side edge of the first bottom supporting plate 51 facing the second bottom supporting plate 52 (i.e., the first side edge 5101) and one side edge of the second bottom supporting plate 52 facing the first bottom supporting plate 51 (i.e., the second side edge 5201) meet the following conditions: at least part of the area of ​​the two is spaced apart from each other, for example, Figure 4 As shown, the first side 5101 and the second side 5201 are completely spaced apart from each other. When the battery 100 suffers thermal failure, a portion of the high-pressure gas can be quickly guided to the explosion-proof valve 6 for exhaust through the space, so that the battery 100 enters the pressure relief mode in time.

[0064] In a specific embodiment of the present application, one side edge of the first bottom support plate 51 facing the second bottom support plate 52 (i.e., the first side edge 5101) and one side edge of the second bottom support plate 52 facing the first bottom support plate 51 (i.e., the second side edge 5201) satisfy the following conditions: at least part of the area abuts or overlaps with each other.

[0065] It should be understood that in this specific embodiment, although the first side edge 5101 and the second side edge 5201 abut against or overlap each other, because the first bottom support plate 51 and the second bottom support plate 52 are two different single bottom support plates separated from each other, there will still be a corresponding gap (which may be relatively small) between the two bottom support plates. This gap still destroys the structural strength of the overall bottom support plate composed of the two bottom support plates. When high-pressure gas impacts this gap, it can still be quickly torn from the gap. Moreover, even if the first side edge 5101 and the second side edge 5201 are overlapped with each other to form a stacked structure, it can still be torn from the upper gap to the lower gap. In this way, regardless of whether the first bottom support plate 51 and the second bottom support plate 52 are provided with a weak portion 501 to assist in pressure relief, at least the pressure relief can be achieved by tearing through the gap. Combined with the auxiliary pressure relief of the exhaust hole 504, a certain pressure relief function can also be achieved.

[0066] In a specific embodiment of the present application, the first side 5101 and the second side 5201 overlap each other, wherein a first overlapping edge 5101′ is provided on the side of the first bottom support plate 51 facing the second bottom support plate 52 (that is, the first side 5101 serves as the first overlapping edge 5101′), and along the height direction Z, the thickness of the first overlapping edge 5101′ is less than the thickness of the main body 502 of the first bottom support plate 51; a second overlapping edge 5201′ is provided on the side of the second bottom support plate 52 facing the first bottom support plate 51 (that is, the second side 5201 serves as the second overlapping edge 5201′), and along the height direction Z, the thickness of the second overlapping edge 5201′ is less than the thickness of the main body 502 of the second bottom support plate 52; the first overlapping edge 5101′ and the second overlapping edge 5201′ overlap each other.

[0067] In this specific embodiment, by using the first side 5101 as the first overlapping edge 5101′ and the second side 5201 as the second overlapping edge 5201′, and setting the two overlapping edges as a thin-walled thick structure, at least the following effects can be achieved: (1) the structural strength of the overlap between the first bottom support plate 51 and the second bottom support plate 52 is reduced, so that when the high-pressure gas impacts the gap between the two bottom support plates, it can be easily torn from the gap to release the pressure; (2) the overall thickness of the overlap between the first bottom support plate 51 and the second bottom support plate 52 is reduced, so as to avoid occupying too much shell The accommodation space of the body 1 is conducive to reducing the external volume of the battery 100 to meet the application requirements of more scenarios for the battery 100 with a smaller volume; (3) the processing accuracy of the length of the two bottom support plates is reduced, and the problem of material waste caused by the processing error that the length of a single bottom support plate is slightly longer and cannot be installed is avoided. It should be understood that this does not mean that the embodiment of the two bottom support plates overlapping each other can only be applied when the length of a single bottom support plate along the length direction X of the battery 100 is longer than 1 / 2 of the shell length. When the length of the two bottom support plates is less than or equal to 1 / 2 of the shell length, the overlapping solution can still be used.

[0068] In a specific embodiment of the present application, a side edge of the first bottom support plate 51 facing the second bottom support plate 52 (i.e., the first side edge 5101) is hot-melt-connected to a side edge of the second bottom support plate 52 facing the first bottom support plate 51 (i.e., the second side edge 5201).

[0069] In a specific embodiment of the present application, Figure 5 and Figure 6 As shown, one side edge of the first bottom support plate 51 facing the second bottom support plate 52 (i.e., the first side edge 5101) and one side edge of the second bottom support plate 52 facing the first bottom support plate 51 (i.e., the second side edge 5201) are connected by a positioning hole 5102 provided on one and a positioning column 5202 provided on the other.

[0070] The present application also provides a battery pack, comprising the battery 100 provided by any of the aforementioned embodiments. The battery pack provided by the present application may include a housing and a plurality of battery cells 100 arranged within a housing space, with a separator plate and a protective plate installed within the housing to protect the battery cells 100.

[0071] In addition, an embodiment of the present application further provides an electrical device, which includes the battery 100 or battery pack provided by any of the aforementioned embodiments. The electrical device can be a mobile phone, a refrigerator, or a vehicle, etc., and this application does not limit it.

[0072] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0073] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0074] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included in the protection scope of the present application.

[0075] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope of protection claimed.

Claims

1. A battery (100), wherein the battery (100) has a height direction (Z), characterized in that: The battery comprises: A shell (1) has a receiving cavity (11); along the height direction (Z), an end surface of the shell (1) is provided with an opening (111); and an end surface of the shell (1) facing away from the opening (111) is provided with an explosion-proof opening (112); A top cover (2) for covering and sealing the opening (111); An explosion-proof valve (6) is installed on the explosion-proof port (112); An electrode assembly (3) is disposed in the accommodating cavity (11); an insulating film (4), disposed in the accommodating cavity (11) and wrapping the electrode assembly (3); A bottom supporting plate (5) is provided in the accommodating cavity (11) and is located on a side of the insulating film (4) facing the explosion-proof valve (6); The bottom supporting plate (5) comprises a first bottom supporting plate (51) and a second bottom supporting plate (52), wherein the first bottom supporting plate (51) and the second bottom supporting plate (52) are arranged relative to each other in a plane perpendicular to the height direction (Z), and at least one exhaust hole (504) is provided on the first bottom supporting plate (51) and / or the second bottom supporting plate (52).

2. The battery (100) according to claim 1, characterized in that: The battery (100) further has a length direction (X) perpendicular to the height direction (Z), and the first bottom supporting plate (51) and the second bottom supporting plate (52) are arranged opposite to each other along the length direction (X); the length of the shell (1) is L, the length of the first bottom supporting plate (51) is L1, and the length of the second bottom supporting plate (52) is L2, then: 1mm≤L1≤L / 2, 1mm≤L2≤L / 2.

3. The battery (100) according to claim 1, characterized in that: The first bottom supporting plate (51) and the second bottom supporting plate (52) respectively comprise a main body (502) and a weak portion (501) provided on the main body (502); along the height direction (Z), the thickness of the weak portion (501) is less than the thickness of the main body (502); and the orthographic projection of at least part of the weak portion (501) on the surface of the side of the shell (1) where the explosion-proof valve (6) is provided coincides with the explosion-proof valve (6).

4. The battery (100) according to claim 3, characterized in that: Along the height direction (Z), the weak portion (501) is a groove or a tooth line provided on the body (502).

5. The battery (100) according to claim 3, characterized in that: The weak portion (501) of the first bottom supporting plate (51) extends to one side edge of the first bottom supporting plate (51), and the weak portion (501) of the second bottom supporting plate (52) extends to one side edge of the second bottom supporting plate (52).

6. The battery (100) according to claim 5, characterized in that: The weak portion (501) includes a first edge groove (511) and a second edge groove (521), wherein the first edge groove (511) is provided on one side edge of the first bottom support plate (51) facing the second bottom support plate (52), and the second edge groove (521) is provided on one side edge of the second bottom support plate (52) facing the first bottom support plate (51), and the openings of the first edge groove (511) and the second edge groove (521) are opposite to each other to form a butt-jointed weak portion (503).

7. The battery (100) according to claim 6, characterized in that: The orthographic projection of at least part of the butt-jointed weak portion (503) on the surface of the housing (1) on the side where the explosion-proof valve (6) is provided coincides with the explosion-proof valve (6).

8. The battery (100) according to claim 7, characterized in that: The orthographic projection of the butt joint weak portion (503) on the surface of the side of the shell (1) on which the explosion-proof valve (6) is provided covers the entire explosion-proof valve (6); or, the edge of the butt joint weak portion (503) is aligned with the edge of the explosion-proof valve (6); or, the orthographic projection of the butt joint weak portion (503) on the surface of the side of the shell (1) on which the explosion-proof valve (6) is provided partially overlaps with the explosion-proof valve (6).

9. The battery (100) according to claim 6, characterized in that: The cross section of the first side groove (511) perpendicular to the height direction (Z) is any one of a "U" shape, a "C" shape, a "V" shape, a trapezoid, a rectangle or a triangle; and / or the cross section of the second side groove (521) perpendicular to the height direction (Z) is any one of a "U" shape, a "C" shape, a "V" shape, a trapezoid, a rectangle or a triangle.

10. The battery (100) according to any one of claims 1 to 9, characterized in that: The edge of the main body (502) on the side of the first bottom supporting plate (51) facing the second bottom supporting plate (52) is flush with the edge of the main body (502) on the side of the second bottom supporting plate (52) facing the first bottom supporting plate (51).

11. The battery (100) according to any one of claims 6 to 9, characterized in that: The first bottom supporting plate (51) and the second bottom supporting plate (52) are arranged opposite to each other along the length direction of the battery (100); the first side groove (511) and the second side groove (521) respectively include a first groove body side edge (5011) and a second groove body side edge (5012) opposite to each other along the width direction of the battery (100); Along the length direction of the battery (100), the length of the first trough body side (5011) is different from the length of the second trough body side (5012), and the longer side of the two is the first trough body side (5011), and the other side is the second trough body side (5012). Then, the first trough body side (5011) of the first bottom support plate (51) is opposite to the second trough body side (5012) of the second bottom support plate (52), and the second trough body side (5012) of the first bottom support plate (51) is opposite to the first trough body side (5011) of the second bottom support plate (52).

12. The battery (100) according to any one of claims 1 to 9, characterized in that: A side edge of the first bottom supporting plate (51) facing the second bottom supporting plate (52) and a side edge of the second bottom supporting plate (52) facing the first bottom supporting plate (51) satisfy the following conditions: at least partial areas are spaced apart from each other.

13. The battery (100) according to any one of claims 1 to 9, characterized in that: One side edge of the first bottom supporting plate (51) facing the second bottom supporting plate (52) and one side edge of the second bottom supporting plate (52) facing the first bottom supporting plate (51) satisfy the following conditions: at least partial areas abut or overlap each other.

14. The battery (100) according to any one of claims 3 to 9, characterized in that: A first overlapping edge (5101′) is provided on the side of the first bottom support plate (51) facing the second bottom support plate (52), and along the height direction (Z), the thickness of the first overlapping edge (5101′) is less than the thickness of the main body (502) of the first bottom support plate (51); a second overlapping edge (5201′) is provided on the side of the second bottom support plate (52) facing the first bottom support plate (51), and along the height direction (Z), the thickness of the second overlapping edge (5201′) is less than the thickness of the main body (502) of the second bottom support plate (52); the first overlapping edge (5101′) and the second overlapping edge (5201′) overlap each other.

15. The battery (100) according to claim 14, characterized in that: One side edge of the first bottom support plate (51) facing the second bottom support plate (52) is connected to one side edge of the second bottom support plate (52) facing the first bottom support plate (51) by heat melting, or connected through a positioning hole (5102) provided on one and a positioning column (5202) provided on the other.

16. A battery pack, characterized in that: A battery (100) comprising any one of claims 1 to 15.

17. An electrical device, characterized in that: Comprising the battery (100) according to any one of claims 1 to 15 or the battery pack according to claim 16.

Images