CN117748047A - Battery and battery pack - Google Patents
Battery and battery pack Download PDFInfo
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- CN117748047A CN117748047A CN202311780860.7A CN202311780860A CN117748047A CN 117748047 A CN117748047 A CN 117748047A CN 202311780860 A CN202311780860 A CN 202311780860A CN 117748047 A CN117748047 A CN 117748047A
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- side wall
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- pressure relief
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- 238000004880 explosion Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000013461 design Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Gas Exhaust Devices For Batteries (AREA)
Abstract
The application discloses battery and battery package, battery include casing, utmost point group, explosion-proof valve and pressure release passageway, and wherein, the actual equivalent sectional area S of pressure release passageway satisfies: s is greater than or equal to (S) 1 S 2 )/(nS 0 ) And nS 0 ≥S 1 ；S 1 For the sum of the areas of the explosion-proof valves, S 2 Is the theoretical equivalent cross section of the pressure release channel, n is the number of explosion-proof valves, S 0 Is the actual area of the explosion-proof valve. The battery provided by the application is characterized in that the equivalent sectional area of the internal pressure relief channel is determined by establishing the relation among the number of the explosion-proof valves, the area of the explosion-proof valves and the size of the pressure relief channel, so that the design of the battery is more reasonable, and when thermal runaway occurs, the pressure relief can be effectively and directionally carried out, so that the internal severe gas production of the battery is not accumulated and blocked and is discharged in time, and the safety problems of shell rupture, explosion and the like caused by the severe gas production of the thermal runaway of the battery are solved.
Description
Technical Field
The application belongs to the technical field of batteries, and particularly relates to a battery and a battery pack.
Background
Along with the increasing maturity of lithium ion battery technology, lithium ion battery is used in electric automobile and energy storage field as power battery more and more extensively, the structural strength and the security performance of lithium ion battery's electric core are very important to the safe operation of electric core, energy and the design of the release passageway of material, such as the design of relief valve, just avoid the battery to take place to fire, explode and play very critical effect, in addition, only keep the relief valve design not enough, still need guarantee that inside material smoothly flows to the relief valve, the passageway does not narrow in the pressure release process.
The existing battery pack has the problem that after design and shaping, the pressure release positions of the single batteries are fixed, and the internal pressure release channels are difficult to determine through the external pressure release channels. Therefore, the relation between the pressure release channel and the pressure release valve inside the battery is scientifically and reasonably designed, so that the battery can smoothly release a large amount of gas in the thermal runaway process and take away heat, the explosion of the battery shell is restrained, the safety performance of the battery is improved, and the problem to be solved at present is solved.
Disclosure of Invention
The application provides a battery and battery package, aims at overcoming the design discomfort of pressure release passageway and explosion-proof valve among the current battery, can't ensure the problem of the security performance of battery.
In one aspect, the present application provides a battery comprising:
the shell comprises two first side walls, a second side wall connected with the two first side walls and a third side wall connected with the two first side walls and the two second side walls, and the first side walls, the second side walls and the third side walls are enclosed to form a containing cavity; the second side wall and/or the third side wall is/are provided with explosion-proof holes, and the explosion-proof holes are communicated with the accommodating cavity;
the pole group is arranged in the accommodating cavity, and the pole group is arranged at intervals with the second side wall and/or the third side wall so as to form a pressure relief channel in the accommodating cavity;
the explosion-proof valve is connected with the second side wall and/or the third side wall and covers the explosion-proof hole;
wherein, the actual equivalent sectional area S of the pressure relief channel satisfies:
S≥(S 1 S 2 )/(nS 0 ) And nS 0 ≥S 1 ；
Wherein S is 1 Is the sum of the areas of the explosion-proof valves, S 2 For the theoretical equivalent cross-sectional area of the pressure relief channel, n is the number of the explosion-proof valves, S 0 Is the actual area of the explosion proof valve.
In some embodiments, the explosion-proof valve area sum S 1 The method meets the following conditions:
S 1 ＝αCV；
wherein C is the rated capacity of the battery, V is the rated voltage of the battery, and alpha is the area coefficient of the explosion-proof valve.
In some embodiments, the pressure relief channel has an equivalent cross-sectional area S 2 The method meets the following conditions:
S 2 ＝γS 1 ；
wherein, gamma is the area coefficient of the pressure relief channel.
In some embodiments, the containment chamber has a length L, a width H, and a thickness T; the sum of the actual areas of the explosion-proof valves meets the following conditions:
nS 0 ＜LT。
in some embodiments, the pole group has a height h and a length l; the actual equivalent sectional area S of the pressure relief channel meets the following conditions:
S＝(HL-hl)T/(H+L)/2。
in some embodiments, the battery includes a plurality of explosion-proof valves disposed on the second side wall and the third side wall, respectively.
In some embodiments, the explosion proof valve is disposed on a center of the second sidewall; and/or the number of the groups of groups,
the explosion-proof valve is symmetrically arranged on the second side wall; and/or the number of the groups of groups,
the explosion-proof valve is arranged on the center of the third side wall; and/or the number of the groups of groups,
the explosion-proof valve is symmetrically arranged on the third side wall.
In some embodiments, the explosion valve area coefficient α satisfies: alpha is more than or equal to 0.3 and less than or equal to 1.
In some embodiments, the pressure relief channel equivalent cross-sectional area coefficient γ satisfies: gamma is more than or equal to 0.1 and less than or equal to 0.5.
Next, the present application also provides a battery pack including the battery of any one of the embodiments.
The beneficial effects of this application lie in, provide a battery, including casing, utmost point group, explosion-proof valve and pressure release passageway, wherein, the actual equivalent sectional area S of pressure release passageway satisfies: s is greater than or equal to (S) 1 S 2 )/(nS 0 ) And nS 0 ≥S 1 ；S 1 For the sum of the areas of the explosion-proof valves, S 2 Is the theoretical equivalent cross section of the pressure release channel, n is the number of explosion-proof valves, S 0 Is the actual area of the explosion-proof valve. The battery provided by the application is characterized in that the equivalent sectional area of the internal pressure relief channel is determined by establishing the relation among the number of the explosion-proof valves, the area of the explosion-proof valves and the size of the pressure relief channel, so that the design of the battery is more reasonable, and when thermal runaway occurs, the pressure relief can be effectively and directionally carried out, so that the internal severe gas production of the battery is not accumulated and blocked and is discharged in time, and the safety problems of shell rupture, explosion and the like caused by the severe gas production of the thermal runaway of the battery are solved.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic view of an external structure of a battery according to an embodiment of the present application;
fig. 2 is a front view of a battery according to an embodiment of the present application;
FIG. 3 is a side view of a battery provided in an embodiment of the present application;
fig. 4 is a front sectional view of a battery according to an embodiment of the present application;
FIG. 5 is a side cross-sectional view of a battery provided in an embodiment of the present application;
fig. 6 is a front sectional view of a battery according to another embodiment of the present application;
fig. 7 is a front sectional view of a battery according to another embodiment of the present application;
fig. 8 is a front cross-sectional view of a battery according to another embodiment of the present application;
fig. 9 is a front sectional view of a battery according to another embodiment of the present application;
fig. 10 is a front sectional view of a battery according to another embodiment of the present application;
fig. 11 is a front sectional view of a battery according to another embodiment of the present application;
fig. 12 is a front cross-sectional view of a battery according to another embodiment of the present application;
fig. 13 is a front sectional view of a battery according to another embodiment of the present application;
reference numerals:
10-shell, 101-first side wall, 102-second side wall, 103-third side wall, 104-accommodating cavity, 20-pole group, 30-pressure release channel, 40-explosion-proof valve and 50-pole ear.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application.
The embodiment of the application provides a battery, including a housing 10, as shown in fig. 1, the housing 10 includes two first side walls 101, a second side wall 102 connecting the two first side walls 101, and a third side wall 103 connecting the two first side walls 101 and the two second side walls 102, and the first side walls 101, the second side walls 102, and the third side walls 103 enclose a containing cavity 104.
Wherein the receiving cavity of the housing 10 has a length L, a width H and a thickness T, as shown in fig. 2-3, it will be appreciated that in some embodiments, the first side wall 101, the second side wall 102 and the third side wall 103 are rectangular, such that the long side of the inner surface of the first side wall 101 has a length L and the short side has a width H; based on the same principle, the short side of the inner surface of the second sidewall 102 has a thickness T.
As shown in fig. 4, the battery in the embodiment of the present application further includes a pole group 20, where the pole group 20 is disposed in the accommodating cavity 104, and an outer wall of the pole group 20 and an inner wall of the second sidewall 102 have a certain distance therebetween, so as to form a pressure relief channel 30 in a shape of a loop in the accommodating cavity 104.
The second side wall 102 and/or the third side wall 103 have explosion-proof holes, and are connected with the pressure release channel 30 to form a passage, and the explosion-proof valve 40 is correspondingly arranged on the second side wall 102 and/or the third side wall 103 and covers the explosion-proof holes. The explosion-proof hole is a structure arranged on the surface of the second side wall 102 and/or the third side wall 103 or penetrating through the second side wall 102 and/or the third side wall 103, and the shape of the explosion-proof hole can be a circular hole, a square hole, a grid hole, an annular notch or the like.
When thermal runaway of the battery occurs, the generated gas and heat flow through the pressure relief passage 30 to the explosion-proof valve 40, and finally, the case 10 is discharged through the explosion-proof valve 40.
The battery in this embodiment of the application further includes a tab 50, where the tab 50 is disposed on the second side wall 102 and/or the third side wall 103 of the housing 10, and the tab 50 may be in the same plane as the explosion-proof valve 40, or may be in a different plane with the explosion-proof valve 40.
The actual equivalent cross-sectional area S of the pressure relief channel 30 satisfies:
S≥(S 1 S 2 )/(nS 0 ) And nS 0 ≥S 1 ；
Wherein S is 1 S is the sum of the areas of the explosion-proof valves 40 2 For the theoretical equivalent cross-sectional area of the pressure relief channel 30, n is the number of the explosion-proof valves 40, S 0 Is the actual area of the explosion proof valve 40.
As a pressure release mechanism in a battery, if the cross-sectional area of the exhaust passage 30 is too small, substances and heat released by the battery are likely to be deposited and blocked, and further, the shell is likely to be broken, and if the cross-sectional area of the exhaust passage 30 is too large, the overall strength of the battery is likely to be affected, and the battery is likely to collapse during operation. The cooperation of the explosion-proof valve 40 and the vent passage 30 is particularly important during the battery pressure relief process. By combining the actual equivalent cross-sectional area S of the pressure relief channel 30 with the number n of explosion proof valves 40, the area S of a single explosion proof valve 40 0 The connection is established, so that the integral pressure relief mechanism can finish pressure relief as efficiently as possible when the battery is in thermal runaway, and meanwhile, the battery can be ensured to have ideal strength so as to maintain normal operation.
S 1 For the total area of the explosion-proof valve 40, it is understood that S is a design value 1 Representative minimum total area values for the explosion proof valve 40 are theoretically required based on factors such as the positive and negative active material properties, gas production and gas production rate of a battery. Therefore, in actual production, only the actual total area value of the explosion-proof valve 40, i.e., nS, is satisfied 0 A minimum total area of the explosion-proof valve 40 that is theoretically required or moreValue S 1 It is ensured that the safety valve 40 can be normally opened to perform pressure relief when the battery is thermally out of control.
In some embodiments, the sum of the areas S of the explosion protection valve 40 1 The method meets the following conditions:
S 1 ＝αCV；
where C is the rated capacity of the battery, V is the rated voltage of the battery, and α is the area coefficient of the explosion-proof valve 40.
Further, the area coefficient α of the explosion-proof valve 40 satisfies: alpha is more than or equal to 0.3 and less than or equal to 1. It is understood that the value of α may be any one of 0.1, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 or a range between any two values.
In some embodiments, the pressure relief channel 30 has a theoretical equivalent cross-sectional area S 2 The method meets the following conditions:
S 2 ＝γS 1 ；
where γ is the area coefficient of the pressure relief channel 30.
Further, the equivalent cross-sectional area coefficient γ of the pressure release passage 30 satisfies: gamma is more than or equal to 0.1 and less than or equal to 0.5. It is understood that the value of γ may be any one of 01, 0.2, 0.3, 0.4, and 0.5 or a range between any two values.
Specifically, the area coefficient α of the explosion-proof valve 40 and the equivalent cross-sectional area coefficient γ of the pressure release channel 30 are shown in table 1 for different active material systems, gas production amounts and gas production rates.
TABLE 1
When the area coefficient α of the explosion-proof valve 40 and the equivalent sectional area coefficient γ of the pressure release channel 30 are valued according to the valued ranges shown in table 1, the finally obtained battery parameters can be ensured to be safe and stable.
In some embodiments, the sum of the areas S of the explosion protection valve 40 1 And the theoretical equivalent cross-sectional area S of the pressure relief channel 30 2 The pressure relief function can be reasonably exerted aiming at battery cells with different characteristics.
In some embodiments, the sum of the actual areas of the explosion proof valve 40 versus the size of the housing 10 satisfies:
nS 0 ＜LT。
it will be appreciated that when the battery is rectangular or cuboid-like, LT may represent the smallest second side wall 102 area of the four second side walls 102 of the casing 10, if the actual total area of the explosion-proof valve 40 is too large, the overall strength of the casing 10 will be affected, and the battery will be easily collapsed and deformed during normal operation, so that when the relationship between the sum of the actual areas of the explosion-proof valve 40 and the size of the casing 10 satisfies the above relationship, the overall strength of the battery can be ensured, and the stable operation of the battery can be maintained.
Further, the pole group 20 has a height h and a length l, by which the actual equivalent cross-sectional area S of the pressure relief channel 30 can be calculated:
S＝(HL-hl)T/(H+L)/2。
in some embodiments, the battery includes a plurality of explosion-proof valves 40, where the explosion-proof valves 40 may be disposed on at least one second side wall 102, on at least one third side wall 103, or on both the second side wall 102 and the third side wall 103.
The number n of explosion protection valves 40 required varies from cell to cell system. For example, for a battery with LFP system and less gas production, only one explosion-proof valve 40 is needed to meet the pressure relief requirement; for different systems or batteries with the same size but large gas production rate and fast gas production rate, the setting of the explosion-proof valves 40 is not limited to two or more according to the requirements of the actual scene.
In some embodiments, as shown in fig. 6, when the battery has a plurality of explosion-proof valves 40, the explosion-proof valves 40 may be disposed at the second and third sidewalls 102 and 103 of the case 10, respectively. Because the pressure release channel 30 is in a shape of a loop, the explosion-proof valves 40 are simultaneously arranged on the second side wall 102 and the third side wall 103, so that an exhaust path formed by connecting the explosion-proof valves 40 and the pressure release channel 30 is more uniform, and gas and heat released by the battery cell can be more effectively and rapidly discharged.
In some embodiments, as shown in fig. 7, the explosion proof valve 40 is disposed on the center of the second sidewall 102. The explosion-proof valve 40 is stably matched with the shell in a top welding mode (laser welding), and when the explosion-proof valve 40 is positioned at the center of the second side wall 102, exhaust is uniform, and a good pressure relief effect is achieved.
Fig. 7 also shows a method of disposing the explosion proof valves 40 in other embodiments, that is, when a plurality of explosion proof valves 40 are disposed on the third side wall 103, the explosion proof valves 40 are symmetrically disposed on the third side wall 103. Based on a similar principle, when the explosion-proof valve 40 is symmetrically arranged on the third side wall 103, the exhaust is more uniform, and the pressure relief effect is better.
Referring to fig. 8 to 13, in actual production, the relative positions and numbers of the explosion-proof valves 40 and the tabs 50 may be set differently according to the battery structure and system. Wherein, the explosion-proof valve 40 and the tab 50 may be simultaneously and symmetrically disposed on the opposite second side wall 102, as shown in fig. 8; it is also possible to provide the tab 50 on the second side wall 102 at the same time as the explosion-proof valve 40 on the third side wall 103 as shown in fig. 9, or to provide the explosion-proof valve 40 and the tab 50 on different third side walls 103, respectively, as shown in fig. 10; when there are only 1 explosion-proof valve 40, it may be disposed between the tabs 50 as shown in fig. 11, or on a third sidewall 103 different from the tabs 50 as shown in fig. 12; the explosion-proof valve 40 may be provided on the second side wall 102 at the same time as the tab 50 is provided on the third side wall 103.
Next, an embodiment of the present application further provides a battery pack including the battery in any of the above embodiments.
The following description is made with reference to specific examples of the battery provided in the present application:
example 1
The present embodiment provides a battery including:
the housing 10, as shown in fig. 1, the housing 10 includes a first side wall 101 and a second side wall 102 connected to the first side wall 101, and the first side wall 101 and the second side wall 102 enclose a housing chamber 104.
As shown in fig. 2-3, the receiving chamber of the housing 10 has a length l=578, a width h=91 and a thickness t=15.
The battery in this embodiment further includes a pole group 20, where the pole group 20 is disposed in the accommodating cavity 104, and a certain distance is provided between an outer wall of the pole group 20 and an inner wall of the second sidewall 102, so as to form a pressure relief channel 30 in a shape of a loop in the accommodating cavity 104.
The explosion proof valve 40 is disposed on the second sidewall 102 and is connected to the pressure relief channel 30 to form a passageway. The number of the explosion-proof valves 40 is 1, and the area S of each explosion-proof valve 40 0 200mm of 2 The distribution of the explosion proof valve 40 is shown in fig. 4.
Sum of areas S of explosion-proof valve 40 1 The method comprises the following steps:
S 1 ＝αCV＝95.7mm 2 ；
theoretical equivalent cross-sectional area S of pressure relief channel 30 2 The method comprises the following steps:
S 2 ＝γS 1 ＝19.1mm 2 ；
the actual equivalent cross-sectional area s= (HL-HL) T/(h+l)/2=29.7 of the pressure relief channel 30.
(S 1 S 2 )/(nS 0 )＝9.2
The actual equivalent cross-sectional area of the pressure relief channel 30 satisfies: 29.7>9.2, S>(S 1 S 2 )/(nS 0 ) At the same time satisfy S 1 ≤nS 0 ＜LT。
The battery system and parameters of example 1 were adjusted and the battery parameters are shown in table 2.
TABLE 2
The batteries of examples 1 to 17 and comparative examples 1 to 11 were subjected to thermal runaway experiments, and the number of times of breakage of the case 10 was recorded, and the results are shown in table 3.
TABLE 3 Table 3
According to the battery parameters and test results of examples 1 to 17, it can be seen that, in the repeated thermal runaway test for the batteries of different systems, different capacitances and different structures, when the actual equivalent cross-sectional area S of the pressure release channel 30 of the battery and the total area S of the explosion-proof valve 40 are equal 1 Theoretical equivalent cross-sectional area S of pressure relief channel 30 2 The number n of explosion proof valves 40 and the actual area S of the explosion proof valves 40 0 The relationship between them satisfies at the same time: s is greater than or equal to (S) 1 S 2 )/(nS 0 ) And nS 0 ≥S 1 The battery can be effectively prevented from being broken under the condition of thermal runaway, and the safety of the battery is improved; as can be seen from the battery parameters and test results of comparative examples 1 to 11, if the actual equivalent cross-sectional area S of the pressure relief passage 30 cannot satisfy S.gtoreq.S 1 S 2 )/(nS 0 ) Or the actual area S of the explosion-proof valve 40 0 Cannot satisfy nS 0 ≥S 1 There is a possibility that the battery may suffer from cracking of the case 10 under repeated thermal runaway conditions.
The battery and the battery pack provided by the embodiment of the present application are described in detail, and specific examples are applied in the present application to illustrate the principles and embodiments of the present application, and the description of the above embodiments is only used to help understand the technical solution and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A battery, comprising:
the shell comprises two first side walls, a second side wall connected with the two first side walls and a third side wall connected with the two first side walls and the two second side walls, and the first side walls, the second side walls and the third side walls are enclosed to form a containing cavity; the second side wall and/or the third side wall is/are provided with explosion-proof holes, and the explosion-proof holes are communicated with the accommodating cavity;
the pole group is arranged in the accommodating cavity, and the pole group is arranged at intervals with the second side wall and/or the third side wall so as to form a pressure relief channel in the accommodating cavity;
the explosion-proof valve is arranged on the second side wall and/or the third side wall;
wherein, the actual equivalent sectional area S of the pressure relief channel satisfies:
S≥(S 1 S 2 )/(nS 0 ) And nS 0 ≥S 1 ；
Wherein S is 1 Is the sum of the areas of the explosion-proof valves, S 2 For the theoretical equivalent cross-sectional area of the pressure relief channel, n is the number of the explosion-proof valves, S 0 Is the actual area of the explosion proof valve.
2. A battery according to claim 1, wherein the sum of the explosion-proof valve areas S 1 The method meets the following conditions:
S 1 ＝αCV；
wherein C is the rated capacity of the battery, V is the rated voltage of the battery, and alpha is the area coefficient of the explosion-proof valve.
3. A cell according to claim 1, wherein the pressure relief channel has a theoretical equivalent cross-sectional area S 2 The method meets the following conditions:
S 2 ＝γS 1 ；
wherein, gamma is the area coefficient of the pressure relief channel.
4. A battery according to claim 1, wherein the receiving cavity has a length L, a width H and a thickness T; the sum of the actual areas of the explosion-proof valves meets the following conditions:
nS 0 ＜LT。
5. a battery according to claim 4, wherein the pole group has a height h and a length l; the actual equivalent sectional area S of the pressure relief channel meets the following conditions:
S＝(HL-hl)T/(H+L)/2。
6. a battery according to claim 1, wherein the battery includes a plurality of explosion-proof valves, the plurality of explosion-proof valves being provided on the second side wall and the third side wall, respectively.
7. A battery according to claim 1, wherein the explosion-proof valve is provided on the center of the second side wall; and/or the number of the groups of groups,
the explosion-proof valve is symmetrically arranged on the second side wall; and/or the number of the groups of groups,
the explosion-proof valve is arranged on the center of the third side wall; and/or the number of the groups of groups,
the explosion-proof valve is symmetrically arranged on the third side wall.
8. A battery according to claim 2, wherein the explosion-proof valve area coefficient α satisfies: alpha is more than or equal to 0.3 and less than or equal to 1.
9. A cell according to claim 3, wherein the pressure relief channel equivalent cross-sectional area coefficient γ satisfies: gamma is more than or equal to 0.1 and less than or equal to 0.5.
10. A battery pack comprising the battery according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311780860.7A CN117748047A (en) | 2023-12-22 | 2023-12-22 | Battery and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311780860.7A CN117748047A (en) | 2023-12-22 | 2023-12-22 | Battery and battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117748047A true CN117748047A (en) | 2024-03-22 |
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ID=90281049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311780860.7A Pending CN117748047A (en) | 2023-12-22 | 2023-12-22 | Battery and battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117748047A (en) |
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2023
- 2023-12-22 CN CN202311780860.7A patent/CN117748047A/en active Pending
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