Battery

Abstract

The utility model discloses a battery which comprises a shell, an anti-explosion valve and a flame-retardant structure, and the shell is provided with a first side wall and a second side wall which are opposite to each other; the anti-explosion valve is mounted on the first side wall; and the flame-retardant structure is mounted on the second side wall, and a flame retardant is arranged in the flame-retardant structure. According to the battery disclosed by the embodiment of the utility model, the explosion-proof valve is arranged on the first side wall, and the flame-retardant structure is arranged on the second side wall, so that when the explosion-proof valve is opened and the flame-retardant structure releases flame retardant, the explosion-proof valve and the flame-retardant structure are respectively arranged on the first side wall and the second side wall which are opposite in position; when the explosion-proof valve is opened, the flame retardant released in the shell can be driven to quickly diffuse in the whole shell, so that the flame-retardant effect of the flame retardant can be better improved, and the risk of thermal runaway in the shell can be further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic batteries, and in particular to a battery. Background Art

[0002] In the context of the era of achieving "carbon peak" and "carbon neutrality", the new energy vehicle industry has developed rapidly, and lithium-ion batteries are the most widely used in the current market. Since lithium is chemically active, it is prone to catch fire and explode under external force, endangering the lives of drivers and passengers. The battery housing is generally designed with explosion-proof valves to prevent internal reactions from becoming too violent and causing explosions. However, in actual thermal runaway tests of battery cells, even when the explosion-proof valves are opened, the battery cells still catch fire and explode. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the utility model is to provide a battery that can better improve the flame retardant effect of the flame retardant and reduce the risk of thermal runaway inside the housing.

[0004] The battery according to an embodiment of the utility model includes: a housing having opposite first and second side walls; an explosion-proof valve installed on the first side wall; and a flame retardant structure installed on the second side wall, the flame retardant structure containing a flame retardant.

[0005] For the battery according to an embodiment of the utility model, by installing the explosion-proof valve on the first side wall and the flame retardant structure on the second side wall, when the explosion-proof valve opens and the flame retardant structure releases the flame retardant, since the explosion-proof valve and the flame retardant structure are respectively installed on the first and second side walls that are opposite to each other, the opening of the explosion-proof valve can drive the released flame retardant in the housing to quickly spread throughout the housing, thereby better improving the flame retardant effect of the flame retardant and further reducing the risk of thermal runaway inside the housing.

[0006] In addition, the battery according to the utility model may further have the following additional technical features:

[0007] In some embodiments of the utility model, the housing is a cuboid, the housing includes a housing body and covers installed at both ends in the length direction of the housing body, the housing body includes two opposite first wall plates and two opposite second wall plates, the area of the first wall plate is larger than that of the second wall plate, and the two second wall plates are respectively the first side wall and the second side wall.

[0008] In some embodiments of the utility model, a plurality of explosion-proof valves are provided, and the plurality of explosion-proof valves are spaced apart along the length direction of the first side wall.

[0009] In some embodiments of the present utility model, in the direction from one end to the other end of the length direction of the first side wall, a plurality of the explosion-proof valves are all located between 1 / 10 and 9 / 10 of the first side wall.

[0010] In some embodiments of the present utility model, the flame-retardant structure includes: a partition plate, an accommodation space for accommodating the flame retardant is constructed between the partition plate and the housing, and through holes are provided on the partition plate; a sealing film, the sealing film covers the through holes to close the through holes.

[0011] In some embodiments of the present utility model, the partition plate is arranged parallel to the second side wall, and the partition plate is used to abut against two wall plates of the housing in the width direction.

[0012] In some embodiments of the present utility model, a plurality of the through holes are provided on the partition plate.

[0013] In some embodiments of the present utility model, the battery further includes a sealing plate and a driving member, the sealing plate is arranged between the partition plate and the second side wall, the accommodation space is located between the partition plate and the sealing plate, and the driving member is arranged between the sealing plate and the second side wall and is used to drive the sealing plate to move.

[0014] In some embodiments of the present utility model, the driving member includes an elastic member, and the elastic member is connected between the sealing plate and the second side wall.

[0015] In some embodiments of the present utility model, the driving member further includes: a telescopic push rod, one end of the telescopic push rod is fixedly connected to the sealing plate, the other end is fixedly connected to the second side wall, the elastic member is a spring, and the spring is sleeved outside the telescopic push rod.

[0016] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic structural diagram of a battery according to an embodiment of the present utility model.

[0019] Figure 2 is a cross-sectional view of a battery according to an embodiment of the present utility model.

[0020] Figure 3 is Figure 2 an enlarged view of area A in

[0021] Reference numerals:

[0022] Battery 100,

[0023] Housing 1, first side wall 11, second side wall 12, cover plate 13, first wall plate 14, positive electrode post 15, negative electrode post 16, explosion-proof valve 2, flame-retardant structure 3, partition plate 31, through hole 311, sealing film 32, sealing plate 33, elastic member 34, telescopic push rod 35. Detailed implementation manners

[0024] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] Next, refer to Figures 1-3 Describe the battery 100 according to the embodiment of the present utility model.

[0028] As Figures 1-3As shown, the battery 100 according to an embodiment of the present utility model includes a housing 1, an explosion-proof valve 2, and a flame-retardant structure 3. The housing 1 has opposite first sidewall 11 and second sidewall 12. The explosion-proof valve 2 is installed on the first sidewall 11, and the flame-retardant structure 3 is installed on the second sidewall 12. The flame-retardant structure 3 contains a flame retardant.

[0029] That is to say, when the battery 100 undergoes thermal runaway, the explosion-proof valve 2 can open to discharge the high-temperature and high-pressure gas, so as to reduce the risk of fire and explosion caused by the accumulation of high-temperature and high-pressure gas in the housing 1. In addition, the flame-retardant structure 3 is installed in the housing 1. When the battery 100 undergoes thermal runaway, the flame retardant in the flame-retardant structure 3 can be released, and the flame retardant can further reduce the risk of thermal runaway in the housing 1.

[0030] In addition, in the present application, the explosion-proof valve 2 is installed on the first sidewall 11, and the flame-retardant structure 3 is installed on the second sidewall 12. When the explosion-proof valve 2 opens and the flame-retardant structure 3 releases the flame retardant, since the explosion-proof valve 2 and the flame-retardant structure 3 are respectively installed on the first sidewall 11 and the second sidewall 12 at opposite positions, the opening of the explosion-proof valve 2 can drive the flame retardant released in the housing 1 to quickly spread throughout the housing 1, thereby better improving the flame-retardant effect of the flame retardant, and further reducing the risk of thermal runaway in the housing 1.

[0031] For the battery 100 according to an embodiment of the present utility model, by installing the explosion-proof valve 2 on the first sidewall 11 and the flame-retardant structure 3 on the second sidewall 12, when the explosion-proof valve 2 opens and the flame-retardant structure 3 releases the flame retardant, since the explosion-proof valve 2 and the flame-retardant structure 3 are respectively installed on the first sidewall 11 and the second sidewall 12 at opposite positions, the opening of the explosion-proof valve 2 can drive the flame retardant released in the housing 1 to quickly spread throughout the housing 1, thereby better improving the flame-retardant effect of the flame retardant, and further reducing the risk of thermal runaway in the housing 1.

[0032] In some embodiments of the present utility model, as Figures 1-3 shown, the housing 1 is a cuboid. The housing 1 includes a housing body and covers 13 installed at both ends in the length direction of the housing body. The housing body includes two opposite first wall plates 14 and two opposite second wall plates. The area of the first wall plate 14 is larger than that of the second wall plate. The two second wall plates are respectively the first sidewall 11 and the second sidewall 12.

[0033] Combined with Figures 1-3As shown, the explosion-proof valve 2 is arranged on the first side wall 11 of the cuboid housing 1. The first side wall 11 has a longer length and a narrower width, which can better arrange the explosion-proof valve 2, simplify the assembly of the explosion-proof valve 2, and moreover, the positive terminal 15 or the negative terminal 16 of the battery 100 is installed on the cover plate 13. The explosion-proof valve 2, the positive terminal 15 and the negative terminal 16 of the battery 100 are respectively installed on different wall plates of the housing 1, which can reduce the interference of the explosion-proof valve 2 on the positive terminal 15 and the negative terminal 16 when developing and releasing high-temperature and high-pressure gas.

[0034] In addition, after the explosion-proof valve 2 is arranged on the first side wall 11, the flame-retardant structure 3 is then arranged on the second side wall 12. The arrangement of the flame-retardant structure 3 will not interfere with the positive terminal 15 and the negative terminal 16 either. Moreover, after the flame-retardant structure 3 releases the flame retardant, the flame retardant can also spread to the positive terminal 15 and the negative terminal 16 relatively quickly, making it not easy to generate the risk of fire at the positive terminal 15 and the negative terminal 16.

[0035] Furthermore, compared with the above-mentioned cover plate 13 and the first wall plate 14, the area of the second side wall 12 is larger than the area of the cover plate 13 and smaller than the area of the first wall plate 14. When the flame-retardant structure 3 is arranged on the second side wall 12, the flame-retardant structure 3 is not likely to occupy too much space of the housing 1, and it is also possible to arrange enough flame retardant more favorably, so as to better meet the flame-retardant requirements of the battery 100.

[0036] In some embodiments of the present utility model, as Figures 1-3 shown, a plurality of explosion-proof valves 2 are provided. The plurality of explosion-proof valves 2 are arranged at intervals along the length direction of the first side wall 11. Through the design of the plurality of explosion-proof valves 2, the ability of the battery 100 to discharge high-temperature and high-pressure gas during thermal runaway can be better improved, and the risk of the battery 100 catching fire and exploding can be better reduced.

[0037] In some embodiments of the present utility model, in the direction from one end to the other end of the length direction of the first side wall 11, the plurality of explosion-proof valves 2 are all located between 1 / 10 and 9 / 10 of the first side wall 11.

[0038] As Figures 1-3 shown in a specific example, two explosion-proof valves 2 are provided. In the direction from one end to the other end of the length direction of the first side wall 11, the two explosion-proof valves 2 are respectively located at the 1 / 4 and 3 / 4 positions of the first side wall 11. Arranged in this way, not only can the number of explosion-proof valves 2 be reduced, but also the demand for the battery 100 to discharge high-temperature and high-pressure gas during thermal runaway can be better met.

[0039] In some embodiments of the present utility model, as Figures 1-3As shown, the flame retardant structure 3 includes a partition plate 31 and a sealing film 32. An accommodation space for the flame retardant is constructed between the partition plate 31 and the housing 1. A through hole 311 is provided on the partition plate 31, and the sealing film 32 covers the through hole 311 to close the through hole 311.

[0040] As Figures 1-3 In an example as shown, the partition plate 31 is arranged between the first side wall 11 and the second side wall 12. The partition plate 31 is adjacent to the second side wall 12. An accommodation space for the flame retardant can be constructed between the partition plate 31 and the second side wall 12. The flame retardant can be well filled in the accommodation space. When the battery 100 undergoes thermal runaway, the temperature inside the battery 100 rises rapidly. The sealing film 32 can be melted or shrunk under the action of high temperature, so that the through hole 311 is opened, and the flame retardant in the accommodation space can be well released through the through hole 311. Here, it should be noted that in one embodiment, the temperature at which the sealing film 32 melts or shrinks is the first temperature, and the temperature at which the explosion-proof valve 2 opens is the second temperature. The first temperature can be less than the second temperature. In this way, the flame retardant in the accommodation space can be released first, so that the pressure inside the housing 1 increases, and the explosion-proof valve 2 can be opened in advance, which can better reduce the risk of the battery 100 catching fire and exploding.

[0041] Exemplarily, the sealing film 32 can be a polymer film. Under the action of high temperature, the polymer film shrinks, its mechanical properties rapidly decline, and at the same time, under the pressure from the inside, the film ruptures, facilitating the rapid overflow of the flame retardant.

[0042] Exemplarily, when the operating temperature of the battery 100 is -20°C to 60°C, the sealing film 32 can prevent the flame retardant from entering the battery cell cavity and affecting the performance of the battery cell. At high temperature, the sealing film 32 is pressured and ruptured, allowing the internal flame retardant to escape.

[0043] Exemplarily, to avoid interference between the partition plate 31 and the sealing film 32, a spacing can be set between them, and the numerical range is 0 - 10 mm.

[0044] For the battery 100 according to the present invention, when the battery 100 undergoes thermal runaway, the explosion-proof valve 2 of the present application can release the flame retardant before the explosion-proof valve 2 reaches the valve-opening state, so that the temperature or pressure inside the housing 1 reaches the valve-opening condition of the explosion-proof valve 2 in advance, thereby causing the explosion-proof valve 2 to open in advance, and effectively reducing the risk of the battery 100 catching fire and exploding.

[0045] In some embodiments of the present invention, as Figures 1-3As shown, the partition plate 31 and the second side wall 12 are arranged in parallel, and the partition plate 31 is used to abut against the two wall plates of the housing 1 in the width direction. Thus, after the partition plate 31 is installed in the housing 1, the structural strength of the housing 1 can be better improved, and in the width direction of the housing 1 (the direction shown by X1 in the attached Figure 1 drawing), the compressive capacity of the housing 1 can be improved, so that the battery 100 can have higher reliability.

[0046] In some embodiments of the present invention, as Figures 1-3 shown, a plurality of through holes 311 are provided on the partition plate 31, and the plurality of through holes 311 can improve the release efficiency of the flame retardant. Optionally, the plurality of through holes 311 can make the partition plate 31 a mesh plate.

[0047] In some embodiments of the present invention, as Figures 1-3 shown, the battery 100 further includes a sealing plate 33 and a driving member. The sealing plate 33 is arranged between the partition plate 31 and the second side wall 12, the accommodating space is located between the partition plate 31 and the sealing plate 33, and the driving member is arranged between the sealing plate 33 and the second side wall 12 for driving the sealing plate 33 to move.

[0048] That is to say, when the battery 100 undergoes thermal runaway, the sealing film 32 breaks or melts to open the through holes 311, and the driving member can drive the sealing plate 33 to move in the height direction of the housing 1 (the direction shown by X2 in the attached Figure 1 drawing), so as to better release the flame retardant in the accommodating space and improve the diffusion efficiency of the flame retardant.

[0049] Exemplarily, the distance between the partition plate 31 and the sealing plate 33 can be 1-5 cm.

[0050] Furthermore, as Figures 1-3 shown, a plurality of through holes 311 are provided on the partition plate 31. When the driving member drives the sealing member to extrude the flame retardant in the accommodating space, the plurality of through holes 311 can form a dispersing effect on the flame retardant and improve the diffusion efficiency of the flame retardant.

[0051] In some embodiments of the present invention, as Figures 1-3As shown, the driving member includes an elastic member 34, and the elastic member 34 is connected between the sealing plate 33 and the second side wall 12. Exemplarily, both the flame retardant and the sealing plate 33 are located above the elastic member 34, and the elastic member 34 is compressed under the gravitational action of the flame retardant and the sealing plate 33. When the battery 100 undergoes thermal runaway, the elastic member 34 will expand. The expansion of the elastic member 34 will increase the elastic potential energy, thereby pushing the sealing plate 33 upward, causing the sealing plate 33 to squeeze the flame retardant in the accommodating space, so that the flame retardant can better break through the sealing film 32 under the action of pressure. Moreover, after the through hole 311 is opened, the flame retardant can also be better pressed out of the accommodating space under the action of the elastic member 34.

[0052] In addition, when the battery 100 undergoes thermal runaway, the flame retardant can also expand. In this way, after the through hole 311 is reported to be opened, the flame retardant can be better pressed out of the accommodating space under the action of the elastic member 34. Coupled with the expansion of the flame retardant itself, it can better increase the pressure in the housing 1 after the flame retardant is released from the through hole 311. In one example, when the flame retardant is released from the accommodating space, the explosion-proof valve 2 is not opened, which can cause the explosion-proof valve 2 to open in advance; in one example, when the flame retardant is released from the accommodating space, if the explosion-proof valve 2 is opened, it can better release the high-temperature and high-pressure gas in the housing 1, and moreover, the flame retardant can also be better diffused in the housing 1.

[0053] In some embodiments of the present invention, as Figures 1-3 shown, the driving member further includes a telescopic push rod 35. One end of the telescopic push rod 35 is fixedly connected to the sealing plate 33, and the other end is fixedly connected to the second side wall 12. The elastic member 34 is a spring, and the spring is sleeved outside the telescopic push rod 35. That is to say, by setting the telescopic push rod 35, it is possible to prevent the spring from being over-compressed or over-extended, so that the spring can always be kept within the effective compression or extension range, and avoid the failure of the spring affecting the release of the flame retardant.

[0054] The spring is preferably made of shape memory alloy material to avoid the spring losing its elasticity due to long-term compression. When the battery 100 is at room temperature, the spring is in a contracted state. When the temperature rises to a certain threshold, the spring can change from the contracted state to the extended state due to the shape memory effect; the spring releases the elastic potential energy, and pushes the flame retardant in the closed space into the interior of the battery cell after being pressurized through the through hole 311. The through hole 311 can be a fine hole. Through the dispersion of the fine hole, the flame retardant can be released in the form of atomization.

[0055] Other components and operations of the battery 100 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0056] In the description of this specification, the descriptions referring to terms such as "some embodiments", "optionally", "furthermore", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0057] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery, characterized in that: include: a housing having a first side wall and a second side wall that are opposite to each other; an explosion-proof valve, the explosion-proof valve being mounted on the first side wall; A flame retardant structure is installed on the second side wall, and a flame retardant is contained in the flame retardant structure.

2. The battery according to claim 1, characterized in that The shell is a rectangular parallelepiped, comprising a shell body and cover plates installed at both ends of the shell body in the length direction, the shell body comprising two opposite first wall panels and two opposite second wall panels, the area of ​​the first wall panel is greater than the area of ​​the second wall panel, and the two second wall panels are the first side wall and the second side wall respectively.

3. The battery according to claim 1, characterized in that A plurality of explosion-proof valves are provided, and the plurality of explosion-proof valves are spaced apart and arranged along the length direction of the first side wall.

4. The battery according to claim 2, characterized in that In a direction from one end to the other end of the length direction of the first side wall, the plurality of explosion-proof valves are located between 1 / 10 and 9 / 10 of the first side wall.

5. The battery according to claim 1, characterized in that The flame retardant structure comprises: A partition plate, a containing space for containing the flame retardant is constructed between the partition plate and the shell, and a through hole is provided on the partition plate; A sealing film is provided, wherein the sealing film covers the through hole to close the through hole.

6. The battery according to claim 5, characterized in that The partition plate and the second side wall are arranged in parallel, and the partition plate is used to abut against two wall plates of the shell in the width direction.

7. The battery according to claim 5, characterized in that A plurality of through holes are provided on the partition plate.

8. The battery according to claim 5, characterized in that It also includes a sealing plate and a driving member, wherein the sealing plate is arranged between the partition plate and the second side wall, the accommodating space is located between the partition plate and the sealing plate, and the driving member is arranged between the sealing plate and the second side wall for driving the sealing plate to move.

9. The battery according to claim 8, characterized in that The driving member includes an elastic member connected between the sealing plate and the second side wall.

10. The battery according to claim 9, characterized in that The driving member further comprises: a telescopic push rod, one end of which is fixedly connected to the sealing plate, and the other end of which is fixedly connected to the second side wall; the elastic member is a spring, and the spring is sleeved outside the telescopic push rod.

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