CN217823017U - Battery cell, battery and power consumption device - Google Patents
Battery cell, battery and power consumption device Download PDFInfo
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- CN217823017U CN217823017U CN202222245628.0U CN202222245628U CN217823017U CN 217823017 U CN217823017 U CN 217823017U CN 202222245628 U CN202222245628 U CN 202222245628U CN 217823017 U CN217823017 U CN 217823017U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The application relates to a battery monomer, a battery and an electric device, wherein the battery monomer comprises a shell, an explosion-proof sheet and an insulating piece, the shell is provided with an accommodating space, and the shell is provided with a pressure relief hole; the explosion-proof sheet covers the pressure relief hole; the insulating member is arranged outside the casing and comprisesThe protective area is used for covering the pressure relief hole, and at least one through hole is formed in the peripheral area; wherein the area of the pressure relief hole is S 0 Total area of at least one through hole is S 1 ，0.25S 0 ≤S 1 . The single battery of this application is through the area S with the pressure release hole 0 Total area S of through-holes in the insulator 1 Is set to satisfy the following relation: 0.25S 0 ≤S 1 So, through the total area percentage of adjusting the through-hole on the insulating part, reduce the structural strength of insulating part in through-hole department promptly for the impact force of battery monomer when the pressure release can break through the insulating part and carry out the pressure release, has promoted the free security performance of battery.
Description
Technical Field
The present disclosure relates to secondary battery technologies, and particularly to a battery cell, a battery and an electric device.
Background
The secondary battery is more and more widely used in daily life of people, a pressure relief mechanism for pressure relief is usually arranged for improving the safety of the secondary battery during use, and when the internal pressure of the secondary battery is too high and pressure relief is needed, the pressure relief mechanism is opened to complete pressure relief.
However, the secondary battery is further provided with a patch for protection, and the problem that the impact force of the secondary battery during pressure relief is difficult to break the patch so as to normally complete the pressure relief in the related art can occur due to the fact that the structural strength of the patch is too high.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a single battery, a battery and an electric device, which solve the problem that the patch is difficult to be broken by the impact force during the pressure relief of the battery due to the excessively high structural strength of the patch, so as to normally complete the pressure relief.
According to an aspect of the present application, an embodiment of the present application provides a battery cell, including: the shell is provided with an accommodating space and is provided with a pressure relief hole; an explosion-proof sheet covering the pressure relief hole; the insulating piece is arranged on the outer side of the shell and comprises a protection area and a peripheral area, the protection area is used for covering the pressure relief holes, and at least one through hole is formed in the peripheral area; wherein the area of the pressure relief hole is S 0 Total area of at least one through hole is S 1 ，0.25S 0 ≤S 1 。
The area S of the pressure relief hole is used for the single battery 0 Total area S of through-holes in the insulator 1 Is set to satisfy the following relation: 0.25S 0 ≤S 1 So, through the total area percentage of adjusting the through-hole on the insulating part, reduce the structural strength of insulating part in through-hole department promptly for the impact force of battery monomer when the pressure release can break through the insulating part and carry out the pressure release, has promoted the free security performance of battery.
In one embodiment, the battery cell further satisfies the following relationship: s. the 1 ≤3S 0 . By adjusting the area S of the pressure relief hole 0 Total area S of through-holes in the insulator 1 Is set to satisfy the following relation: s 1 ≤3S 0 Therefore, the total area of the through holes in the insulating part is adjusted, so that the covering area of the insulating part on the shell meets the insulating performance requirement of the shell, and the safety performance of the battery cell is improved.
In one embodiment, the minimum distance of the at least one through hole from the edge of the guard area is L 1 ，1mm≤L 1 Less than or equal to 56mm. By spacing the via a minimum distance L from the edge of the guard zone 1 Is set to satisfy the following relation: l is not less than 1mm 1 56mm, so, make the guard area on the insulating part can cover the pressure release hole completely, can allow the insulating part to have certain assembly error promptly, have better guard action to the pressure release hole. And if the lower limit of the relation is exceeded, L 1 Less than or equal to 1mm, the situation that the pressure relief hole cannot be completely shielded can occur in the actual assembly process of the insulating part; conversely, if the upper limit of the relation is exceeded, L 1 More than or equal to 56mm, the effective area of the opening on the insulating part is reduced, and the pressure relief is influenced.
In one embodiment, the minimum distance of the at least one through hole from the edge of the peripheral region is L 2 ，1mm≤L 2 Less than or equal to 56mm. By spacing the through-hole a minimum distance L from the edge of the peripheral region 2 Is set to satisfy the following relation: l is not less than 1mm 2 Less than or equal to 56mm, thus the structure of the peripheral area on the insulating part is complete and not easy to damage, and the insulating part can be completely damagedThe edge of the shell is covered in a soil preparation way, and the requirement of the insulating property of the shell is met. And if the lower limit of the relation is exceeded, L 2 The thickness is less than or equal to 1mm, the insulating part is easy to damage, and the insulating protection effect of the insulating part on the shell is reduced; if the upper limit of the relation is exceeded, L 2 And the effective area of the opening on the insulating part is reduced when the diameter is more than or equal to 56mm, so that the pressure relief is influenced.
In one embodiment, the battery cell further comprises a terminal post; the at least one through hole comprises a first through hole, and the first through hole exposes the pole. By means of the design, the strength of the insulating part beside the first through hole can be reduced by means of the first through hole in the insulating part, and when the battery monomer is in thermal runaway, thermal runaway discharge easily breaks through the insulating part beside the first through hole, so that the thermal runaway discharge can be smoothly discharged out of the battery monomer, and thermal diffusion is avoided.
In one embodiment, the at least one through hole further includes a plurality of second through holes disposed around the guard area, the plurality of second through holes being disposed between the guard area and the first through holes. Through setting up a plurality of second through-holes that encircle the guard zone, can further reduce the intensity of insulating part, when battery cell thermal runaway, the other insulating part of second through-hole is more broken through to the thermal runaway discharge, makes the thermal runaway discharge battery cell smoothly, avoids causing the thermal diffusion.
In one embodiment, the protective zone is a mica sheet, a ceramic sheet, or a fiberglass sheet. By adopting high-temperature-resistant and fireproof materials such as mica sheets, ceramic sheets or glass fiber sheets, the protection area of the insulating part has good high-temperature-resistant and fireproof performances, and the explosion-proof sheet can be well protected.
In one embodiment, the peripheral region is bonded to the housing. Through bonding the peripheral zone with the insulating part in the shell for the insulating part is firmly fixed, is difficult for droing, can play good guard action to the pressure release hole.
According to another aspect of the present application, an embodiment of the present application further provides a battery, including: a box body; and a plurality of the single batteries are arranged in the box body.
Foretell battery owing to adopted foretell battery monomer, through the total area proportion of adjusting the through-hole on the insulating part in the battery monomer, reduces the structural strength of insulating part in through-hole department for the impact force of battery monomer when the pressure release can break through the insulating part and carry out the pressure release, has promoted the free security performance of battery, thereby has also promoted the security performance of battery.
According to yet another aspect of the present application, an electric device is further provided, which includes the battery as described above, and the battery is used for providing electric energy.
Foretell power consumption device through having adopted foretell battery, through the total area ratio of adjusting the through-hole on the insulating part in the battery monomer, reduces the structural strength of insulating part in through-hole department for the impact force of battery monomer when the pressure release can break through the insulating part and carry out the pressure release, has promoted the free security performance of battery, thereby has also promoted power consumption device's security performance.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 is a schematic overall structural diagram of a vehicle according to an embodiment of the present application;
fig. 2 is an exploded view of the overall structure of a battery according to an embodiment of the present application;
fig. 3 is an exploded view of a structure of an outer case and an insulating member in a battery cell according to an embodiment of the present disclosure;
fig. 4 is a partial structural cross-sectional view of a battery cell provided in accordance with an embodiment of the present application;
fig. 5 is a schematic structural diagram of a battery cell provided in an embodiment of the present application from another perspective;
fig. 6 is a schematic structural diagram of an insulating member in a battery cell according to an embodiment of the present disclosure;
fig. 7 is an exploded view of a structure of an outer case and an insulating member in a battery cell according to another embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a battery cell provided in another embodiment of the present application at another viewing angle;
fig. 9 is a schematic structural diagram of an insulating member in a battery cell according to another embodiment of the present disclosure.
The reference numbers in the detailed description are as follows:
1: an electricity-consuming device;
10: a battery;
100: a battery cell;
110: housing, 111: a pressure relief vent;
120: an explosion-proof sheet;
130: insulator, 131: guard area, 132: peripheral region, 133: through hole, 1331: first through hole, 1332: a second through hole;
140: a pole column;
200: and (4) a box body.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediary. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
At present, with the development of technology, the application scenarios of power batteries are also more and more extensive, and power batteries are not only applied to energy storage power systems such as hydraulic power, thermal power, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of power batteries, the safety of batteries in use is becoming the focus of people's attention.
The applicant has noted that, in order to improve the safety of the battery during use, a pressure relief mechanism for pressure relief is usually provided, and when the internal pressure of the secondary battery is too high and pressure relief is required, the pressure relief mechanism is opened to complete pressure relief. However, the secondary battery is further provided with a patch for protection, and the problem that the patch cannot be normally decompressed due to the fact that the patch is difficult to break by impact force of the secondary battery during pressure relief due to the fact that the structural strength of the patch is too high in the related art can occur.
Based on the above consideration, in order to solve the problem that the impact force of the battery is difficult to break the patch during pressure relief due to the over-high structural strength of the patch, so as to normally complete the pressure relief, through intensive research, the applicant designs a single battery, and the area S of the pressure relief hole on the casing is the same as the area S of the pressure relief hole on the single battery 0 Total area S of through-holes in the insulator 1 Is set to satisfy the following relation: 0.25S 0 ≤S 1 So, through the total area percentage of adjusting the through-hole on the insulating part, reduce the structural strength of insulating part in through-hole department promptly for the impact force of battery monomer when the pressure release can break through the insulating part and carry out the pressure release, has promoted the free security performance of battery.
The single battery that this application embodiment discloses is applied to in the battery, uses to possess the single battery that this application embodiment discloses, and when the free internal pressure of battery wherein is too high, when needing the pressure release, the impact force during the pressure release can break through the insulating part and carry out the pressure release, has promoted the stability of performance and the security of battery.
The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.
For convenience of description, the following embodiments will be described by taking an electric device 1 as a vehicle in an embodiment of the present application. Referring to fig. 1, fig. 1 is a schematic view of an overall structure of a vehicle according to an embodiment of the present disclosure.
The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, wherein the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extending automobile and the like. The interior of the vehicle is provided with a battery 10, and the battery 10 may be provided at the bottom or at the head or tail of the vehicle. The battery 10 may be used for power supply of a vehicle, for example, the battery 10 may serve as an operation power source of the vehicle. The vehicle may also include a controller and a motor, the controller being used to control the battery 10 to power the motor, for example, for start-up, navigation, and operational power requirements while traveling of the vehicle. In some embodiments of the present application, the battery 10 may be used not only as an operating power source of a vehicle, but also as a driving power source of the vehicle, instead of or in part instead of fuel or natural gas, to provide driving power for the vehicle.
Referring to fig. 2, fig. 2 is an exploded view of the overall structure of a battery 10 according to an embodiment of the present disclosure.
The battery 10 including the battery cells 100 may serve as a power supply system of the electric device 1, and the plurality of battery cells 100 are disposed in the housing 200. The battery cell 100 refers to a minimum unit constituting the battery 10, and in the battery 10, there may be a plurality of battery cells 100, and the plurality of battery cells 100 may be connected in series, in parallel, or in series-parallel, where in the series-parallel connection refers to both series connection and parallel connection among the plurality of battery cells 100. A plurality of battery cells 100 can be directly connected in series or in parallel or in series-parallel to form a battery module, and are accommodated in a box 200 of the battery 10; of course, a plurality of battery cells 100 may be connected in series, in parallel, or in series-parallel to form a battery module, and then a plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a battery module, and the battery module may be accommodated in the case 200 of the battery 10.
The case 200 serves to provide a receiving space for the battery cell 100, and the case 200 may take various structures. In some embodiments, the case 200 may include a bottom plate and a plurality of side plates, the side plates are connected end to end, the bottom plate is connected to the bottom of each side plate and encloses an accommodating space for accommodating the battery cell 100 together with the side plates, that is, the bottom plate and the side plates enclose to form an accommodating groove. Of course, the receiving groove formed by the bottom plate and the side plate may have various shapes, for example, a cylinder, a rectangular parallelepiped, etc.
According to some embodiments of the present disclosure, referring to fig. 3 to 6, fig. 3 is an exploded view of a structure of an outer casing 110 and an insulating member 130 in a battery cell 100 according to an embodiment of the present disclosure, fig. 4 is a partial structural cross-sectional view of the battery cell 100 according to an embodiment of the present disclosure, fig. 5 is a schematic structural view of the battery cell 100 according to an embodiment of the present disclosure from another perspective, and fig. 6 is a schematic structural view of the insulating member 130 in the battery cell 100 according to an embodiment of the present disclosure.
The embodiment of the application provides a battery cell 100, the battery cell 100 includes a housing 110, an explosion-proof sheet 120 and an insulating member 130, the housing 110 has an accommodating space, and the housing 110 is provided with a pressure relief hole 111; the explosion-proof sheet 120 covers the pressure relief hole 111; the insulating member 130 is disposed outside the outer shell 110, the insulating member 130 includes a protection region 131 and a peripheral region 132, the protection region 131 is used for covering the pressure relief hole 111, and at least one through hole 133 is disposed on the peripheral region 132; wherein the area of the pressure relief hole 111 is S 0 The total area of the at least one through-hole 133 is S 1 ，0.25S 0 ≤S 1 。
Wherein, each battery cell 100 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 100 may be cylindrical, flat, rectangular parallelepiped, or other shape.
In the battery cell 100, the accommodating space in the outer casing 110 is used for accommodating components such as pole pieces, diaphragms, tabs and the like in the battery cell 100, and the outer casing 110 may have various structures. In some embodiments, the housing 110 encloses a receiving space in a shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, a pressure relief hole 111 communicating with the receiving space is formed in one side of the housing 110, and the pressure relief hole 111 is covered with an explosion-proof sheet 120, the explosion-proof sheet 120 may be disposed on an outer side of the housing 110 to cover the pressure relief hole 111, and the explosion-proof sheet 120 may also be disposed on an inner side of the housing 110 to cover the pressure relief hole 111. When the internal pressure of the battery cell 100 is too high due to a short circuit or other reasons during use, the gas inside the battery cell will impact the explosion-proof sheet 120, so that the explosion-proof sheet 120 is opened to complete pressure relief. The shape and size of the pressure relief hole 111 may be adjusted according to the use requirement of the battery cell 100, and is not particularly limited herein.
Meanwhile, the outer side of the outer shell 110 is further provided with an insulating member 130, and the insulating member 130 is made of an insulating material, so that the insulating member can insulate and protect the components in the outer shell 110 and the explosion-proof sheet 120. The insulating member 130 includes a protection region 131 and a peripheral region 132, wherein the protection region 131 is used for covering the pressure relief hole 111, and an orthographic projection of the protection region 131 on the outer shell 110 coincides with the pressure relief hole 111, so that a boundary of the protection region 131 coincides with an edge contour of the pressure relief hole 111 on the outer shell 110. The peripheral region 132 is an area of the insulating member 130 corresponding to the area outside the pressure relief hole 111, the boundary of the peripheral region 132 is overlapped with the edge profile of the insulating member 130, and the protection region 131 and the peripheral region 132 may be connected to each other. Specifically, as shown in fig. 5 and fig. 6, an area inside a dashed line frame on the insulating element 130 in fig. 5 is a position where the pressure relief hole 111 is located, an area inside a dashed line frame on the insulating element 130 in fig. 6 is a protection area 131 coinciding with an edge profile of the pressure relief hole 111, and an area outside the dashed line frame on the insulating element 130 in fig. 6 is a peripheral area 132.
The shape and size of the guard 131 depends on the shape and size of the pressure relief vent 111. Therefore, the relative positional relationship between the guard region 131 and the peripheral region 132 is not fixed.
Since some structures on the outer casing 110 need to be exposed in the battery cell 100 for connection, at least one through hole 133 is further disposed on the peripheral region 132 of the insulating member 130, so that the structures on the outer casing 110 that need to be exposed are not shielded, but are exposed through the through hole 133. According to different use requirements, the number of the through holes 133 may be one or multiple, and the shape, position, etc. of the through holes 133 may also be flexibly set according to actual situations, which is not limited herein.
In the battery cell 100 of the embodiment of the present application, the area of the pressure relief hole 111 is S 0 Total area of the through-holes 133 is S 1 In order to make the single battery 100 break the explosion-proof sheet 120 by the impact force during the pressure relief, and then break the protection region 131 on the insulating member 130, so as to complete the normal pressure relief, the single battery 100 in the embodiment of the present application satisfies the following relation: 0.25S 0 ≤S 1 . When the number of the through-holes 133 is one, S 1 When the number of the through holes 133 is plural, S is the area of the through holes 133 1 Which is the sum of the areas of all the through holes 133.
The battery cell 100 of the embodiment of the present application is formed by dividing the area S of the pressure release hole 111 0 And the total area S of the through-hole 133 of the insulating member 130 1 Is set to satisfy the following relation: 0.25S 0 ≤S 1 So, through the total area proportion of adjusting through-hole 133 on the insulating part 130, reduce the structural strength of insulating part 130 in through-hole 133 department promptly for the impact force of battery cell 100 when the pressure release can break through insulating part 130 and carry out the pressure release, has promoted battery cell 100's security performance.
In some embodiments, S 0 Greater than or equal to 400mm 2 To speed up the rate of pressure relief. For example, S 0 Is 400mm 2 、410mm 2 、420mm 2 、450mm 2 、500mm 2 And the like.
Illustratively, in some embodiments, the area S of the pressure relief hole 111 0 =400mm 2 In this case, the value of 100mm can be calculated from the above relation 2 ≤S 1 . That is, the total area of the through holes 133 in the peripheral region 132 of the insulating member 130 is only required to satisfy S 1 ≥100mm 2 The structural strength of the insulating member 130 can be reduced to a desired level, so that the impact force generated when the battery cell 100 is decompressed can break through the insulating member 130 to release the voltage. At this time, the total area S of the through holes 133 on the peripheral region 132 of the insulating member 130 1 May be 100mm 2 、105mm 2 、110mm 2 、120mm 2 、150mm 2 And the like. The above data are merely examples, and the total area S of the through-holes 133 in the practical embodiment 1 The above data are not intended to be limiting.
In some embodiments, the battery cell 100 further satisfies the following relationship: s 1 ≤3S 0 。
Area S of pressure relief hole 111 0 And the total area S of the through-holes 133 of the insulating member 130 1 The following relation is satisfied: 0.25S 0 ≤S 1 In the meantime, the impact force of the battery cell 100 during the pressure relief can break the insulating member 130 to relieve the pressure, and on the basis, the area S of the pressure relief hole 111 0 And the total area S of the through-holes 133 of the insulating member 130 1 The following relation is also satisfied: s 1 ≤3S 0 Therefore, by adjusting the total area ratio of the through holes 133 on the insulating member 130, the coverage area of the insulating member 130 to the outer shell 110 meets the insulating performance requirement of the outer shell 110, and the safety performance of the battery cell 100 is improved.
Illustratively, in some embodiments, the area S of the pressure relief hole 111 0 =400mm 2 In this case, S can be calculated from the above relation 1 ≤1200mm 2 . That is, the total area of the through holes 133 in the peripheral region 132 of the insulating member 130 is only required to satisfy S 1 ≤1200mm 2 The fastening degree of the insulator 130 can be enhanced to a desired degree so that the insulator 130 is not easily detached. At this time, the total area S of the through holes 133 on the peripheral region 132 of the insulating member 130 1 May be 150mm 2 、300mm 2 、600mm 2 、900mm 2 、1200mm 2 And the like. The above data are merely examples, and the total area S of the through-holes 133 in the practical embodiment 1 Not more thanThe data are limited.
In some embodiments, the minimum distance of the at least one through-hole 133 from the edge of the guard zone 131 is L 1 ，1mm≤L 1 ≤56mm。
The through holes 133 on the peripheral region 132 of the insulating member 130 should not extend into the protection region 131, so as not to damage the integrity of the protection region 131, i.e. a certain distance should be kept between the through holes 133 and the edge of the protection region 131. In some embodiments, the at least one through-hole 133 is a minimum distance L from an edge of the guard zone 131 1 Satisfies the following conditions: l is not less than 1mm 1 ≤56mm。
Minimum distance L of through-hole 133 from edge of guard region 131 1 I.e. the distance at which the through hole 133 is closest to the edge of the guard region 131. By a minimum distance L of the at least one through hole 133 from the edge of the guard zone 131 1 Is set to satisfy the following relation: l is not less than 1mm 1 56mm or less, so that the protection area 131 on the insulating member 130 can completely cover the pressure relief hole 111, that is, the insulating member 130 can be allowed to have a certain assembly error, and the pressure relief hole 111 can be better protected. And if the lower limit of the relation is exceeded, L 1 Less than or equal to 1mm, the situation that the pressure relief hole 111 cannot be completely shielded can occur in the actual assembling process of the insulating member 130; conversely, if the upper limit of the relation is exceeded, L 1 More than or equal to 56mm, the effective area of the opening on the insulating member 130 is reduced, and the pressure relief is affected. Illustratively, the minimum distance L of the through-hole 133 from the edge of the guard region 131 1 May be 1mm, 5mm, 10mm, 20mm, 50mm, 56mm, etc. The above data are merely exemplary, and in practical embodiments the minimum distance L of the at least one via 133 from the edge of the guard 131 1 The above data are not intended to be limiting.
In other embodiments, the at least one through-hole 133 is a minimum distance L from an edge of the guard 131 1 Satisfies the following conditions: l is not less than 1mm 1 Less than or equal to 36mm. At this time, exemplarily, the minimum distance L of the through hole 133 from the edge of the guard region 131 1 May be 1mm, 5mm, 10mm, 20mm, 30mm, 36mm, etc.
In some embodiments, at least one via 133 is spaced from an edge of peripheral region 132Has a minimum distance of L 2 ，1mm≤L 2 ≤56mm。
The through holes 133 on the peripheral region 132 of the insulating member 130 should not cross over the edge of the insulating member 130, so as not to damage the integrity of the edge of the insulating member 130, i.e. a certain distance should be kept between the through holes 133 and the edge of the peripheral region 132. In some embodiments, the minimum distance L of the through-hole 133 from the edge of the peripheral region 132 2 Satisfies the following conditions: l is not less than 1mm 2 ≤56mm。
Minimum distance L of through hole 133 from edge of peripheral region 132 2 I.e., the distance at which the through hole 133 is closest to the edge of the peripheral region 132. By spacing the at least one through-hole 133 a minimum distance L from the edge of the peripheral region 132 2 Is set to satisfy the following relation: l is not less than 1mm 2 Less than or equal to 56mm, so that the peripheral area 132 on the insulating part 130 has a complete structure and is not easy to damage, the edge of the outer shell 110 can be completely covered, and the requirement of the insulating performance of the outer shell 110 is met. And if the lower limit of the relation is exceeded, L 2 The thickness is less than or equal to 1mm, the insulating part 130 is easy to damage, and the insulating protection effect of the insulating part 130 on the shell 110 is reduced; if the upper limit of the relation is exceeded, L 2 Not less than 56mm, the effective area of the opening on the insulating member 130 is reduced, and the pressure relief is affected. Illustratively, the minimum distance L of the through-hole 133 from the edge of the peripheral region 132 2 May be 1mm, 5mm, 10mm, 20mm, 50mm, 56mm, etc. The above data are merely exemplary, and in practical embodiments the minimum distance L of at least one through-hole 133 from the edge of the peripheral region 132 2 The above data are not intended to be limiting.
In other embodiments, the minimum distance of the at least one through hole 133 from the edge of the peripheral region 132 is L 2 ，1mm≤L 2 Less than or equal to 36mm. At this time, exemplarily, the minimum distance L of the through hole 133 from the edge of the peripheral region 132 2 May be 1mm, 5mm, 10mm, 20mm, 30mm, 36mm, etc.
In some embodiments, the battery cell 100 further includes a post 140; the at least one through hole 133 includes a first through hole 1331, and the first through hole 1331 exposes the post 140.
As described above, the through hole 133 on the peripheral region 132 of the insulating member 130 is used to expose some structures on the outer casing 110 to facilitate connection, and for example, in some embodiments, the battery cell 100 further includes the terminal post 140, and the through hole 133 includes the first through hole 1331, by means of which the terminal post 140 can be exposed. The electrode posts 140 are used for leading out the positive and negative electrodes of the battery cell 100 so as to facilitate the output of electric energy. The post 140 may include a positive post 140 for extracting a positive electrode, and may also include a negative post 140 for extracting a negative electrode. The strength of the insulating member 130 beside the first through hole 1331 is reduced by the first through hole 1331 of the insulating member 130, so that when the battery cell 100 is thermally runaway, the thermal runaway discharge easily breaks through the insulating member 130 beside the first through hole 1331, the thermal runaway discharge is smoothly discharged out of the battery cell 100, and thermal diffusion is avoided.
Referring to fig. 7 to 9 in combination with fig. 4, fig. 7 is an exploded view of a structure of a housing 110 and an insulating member 130 in a battery cell 100 according to another embodiment of the present disclosure, fig. 8 is a schematic structural view of the battery cell 100 according to another embodiment of the present disclosure at another viewing angle, and fig. 9 is a schematic structural view of the insulating member 130 in the battery cell 100 according to another embodiment of the present disclosure.
In fig. 8, the area inside the dashed line frame on the insulating member 130 is the position of the pressure relief hole 111, the area inside the dashed line frame on the insulating member 130 in fig. 9 is the protection area 131 coinciding with the edge profile of the pressure relief hole 111, and the areas outside the dashed line frame on the insulating member 130 in fig. 9 are all the peripheral areas 132.
In some embodiments, the at least one through hole 133 further includes a plurality of second through holes 1332 disposed around the protected area 131, the plurality of second through holes 1332 being disposed between the protected area 131 and the first through holes 1331.
The peripheral region 132 of the insulating member 130 may be provided with a first through hole 1331 capable of exposing the pole 140, and may also be provided with a second through hole 1332 having other functions. Illustratively, the second through hole 1332 may be used for sampling the housing 110 to obtain information such as temperature on the housing 110 through sampling. Through setting up a plurality of second through-holes 1332 that encircle guard band 131, can further reduce the intensity of insulating member 130, when battery cell 100 thermal runaway, thermal runaway discharge more easily breaks through the insulating member 130 by second through-hole 1332, makes thermal runaway discharge smoothly discharge battery cell 100, avoids causing the thermal diffusion.
In some embodiments, the guard zone 131 employs a mica sheet, a ceramic sheet, or a fiberglass sheet.
As described above, the insulating member 130 is made of an insulating material, and the protection region 131 on the insulating member 130 may be made of mica, ceramic or glass fiber, wherein the mica is made of mica, which is a general term for minerals in the mica group, and is aluminosilicate of metals such as potassium, aluminum, magnesium, iron, lithium, etc., which are layered structures and have insulating and high temperature resistant properties. The ceramic chip is made of ceramic, the main components of the ceramic are silicate and aluminosilicate, refractory metal oxide and metal nitride, boride and the like, and the ceramic chip has the advantages of excellent insulation, corrosion resistance, high temperature resistance, high hardness, low density, radiation resistance and the like. The glass fiber sheet is made of glass fibers, the main components of the glass fibers are silicon dioxide, aluminum oxide, calcium oxide, boron oxide, magnesium oxide, sodium oxide and the like, and the glass fibers have the advantages of good insulativity, strong heat resistance, good corrosion resistance, high mechanical strength and the like. By adopting high-temperature-resistant and fireproof materials such as mica sheets, ceramic sheets, glass fiber sheets and the like, the protection area 131 of the insulating piece 130 has good high-temperature-resistant and fireproof performances, and can play a good protection role in the explosion-proof sheet 120.
In some embodiments, peripheral region 132 is bonded to outer shell 110.
The insulating member 130 is disposed on a side of the explosion-proof sheet 120 facing away from the outer shell 110, and illustratively, the peripheral region 132 of the insulating member 130 is bonded to the outer shell 110. The type of the plastic material used for bonding the peripheral region 132 to the outer shell 110 is not limited, and the peripheral region 132 of the insulating member 130 is bonded to the outer shell 110, so that the insulating member 130 is firmly fixed and is not easy to fall off, and the pressure relief hole 111 can be well protected.
The embodiment of the present application further provides a battery 10, where the battery 10 includes a box 200 and a plurality of single batteries 100 as in any of the above embodiments, and the single batteries 100 are disposed in the box 200.
The battery 10 of the embodiment of the application adopts the above-mentioned battery cell 100, and the total area ratio of the through holes 133 on the insulating member 130 is adjusted in the battery cell 100, so that the structural strength of the insulating member 130 at the through holes 133 is reduced, the impact force of the battery cell 100 during pressure relief can break through the insulating member 130 to relieve the pressure, the safety performance of the battery cell 100 is improved, and the safety performance of the battery 10 is also improved.
The embodiment of the present application further provides an electric device 1, where the electric device 1 includes a battery 10 as in any of the above embodiments, and the battery 10 is used for providing electric energy.
The electric device 1 of the embodiment of the application reduces the structural strength of the insulating member 130 at the through hole 133 by adopting the battery 10 and adjusting the total area ratio of the through hole 133 on the insulating member 130 in the single battery 100, so that the impact force of the single battery 100 during pressure relief can break through the insulating member 130 to relieve the pressure, the safety performance of the single battery 100 is improved, and the safety performance of the electric device 1 is also improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A battery cell (100), comprising:
the pressure relief valve comprises a shell (110) and a valve body, wherein the shell (110) is provided with an accommodating space, and the shell (110) is provided with a pressure relief hole (111);
an explosion-proof sheet (120) covering the pressure release hole (111); and
the insulating piece (130) is arranged on the outer side of the outer shell (110), the insulating piece (130) comprises a protective area (131) and a peripheral area (132), the protective area (131) is used for covering the pressure relief hole (111), and at least one through hole (133) is formed in the peripheral area (132);
wherein the area of the pressure relief hole (111) is S 0 The total area of the at least one through hole (133) is S 1 ，0.25S 0 ≤S 1 。
2. The battery cell (100) of claim 1, wherein the battery cell (100) further satisfies the following relationship: s. the 1 ≤3S 0 。
3. The battery cell (100) of claim 1, wherein the at least one through hole (133) has a minimum distance L from an edge of the guard region (131) 1 ，1mm≤L 1 ≤56mm。
4. The battery cell (100) of claim 1, wherein the at least one through hole (133) has a minimum distance L from an edge of the peripheral region (132) 2 ，1mm≤L 2 ≤56mm。
5. The battery cell (100) according to any one of claims 1 to 4, wherein the battery cell (100) further comprises a pole (140);
the at least one through hole (133) includes a first through hole (1331), and the first through hole (1331) exposes the post (140).
6. The battery cell (100) of claim 5, wherein the at least one through-hole (133) further comprises a plurality of second through-holes (1332) disposed around the guard region (131), the plurality of second through-holes (1332) being disposed between the guard region (131) and the first through-holes (1331).
7. The battery cell (100) according to any of claims 1 to 4, wherein the protective region (131) is a mica sheet, a ceramic sheet or a glass fiber sheet.
8. The battery cell (100) of any of claims 1 to 4, wherein the peripheral region (132) is bonded to the outer housing (110).
9. A battery (10), comprising:
a case (200); and
a plurality of battery cells (100) according to any of claims 1 to 8, the battery cells (100) being arranged within the housing (200).
10. An electric consumer (1) comprising a battery (10) according to claim 9, the battery (10) being adapted to provide electric energy.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222245628.0U CN217823017U (en) | 2022-08-25 | 2022-08-25 | Battery cell, battery and power consumption device |
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| CN202222245628.0U CN217823017U (en) | 2022-08-25 | 2022-08-25 | Battery cell, battery and power consumption device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024159409A1 (en) * | 2023-01-31 | 2024-08-08 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery and electric device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024159409A1 (en) * | 2023-01-31 | 2024-08-08 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery and electric device |
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