Battery and battery pack

Abstract

The present invention relates to the field of battery technology, and discloses a battery and a battery pack, comprising: a shell, wherein a storage space is formed inside; an explosion-proof valve, which is arranged on the side of the shell; a pole group, which is located in the storage space; a support member, which is arranged in the storage space, and the support member is located between the side of the shell where the explosion-proof valve is arranged and the pole group; the support member comprises an annular body and a limiting part, and the limiting part is supported on both sides of the inner circle of the annular body along the width direction of the annular body. The present invention reserves an exhaust space between the shell and the pole group by arranging a support member, which is supported between the side of the shell and the pole group, reduces the gas transmission resistance, facilitates the rapid discharge of the gas inside the battery, and ensures the safety of the battery; and by arranging a limiting part, the two sides of the annular body are supported inside the annular body, so as to avoid the support member from being concave and deformed in the width direction, facilitate the assembly of the support member, and ensure the exhaust effect of the center hole of the annular body.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery and a battery pack. Background Art

[0002] At present, with the vigorous development of the new energy vehicle industry, consumers have higher and higher requirements for the safety performance of new energy vehicles, and the application of power, driving range, and high nickel system also increases the risk of battery runaway. When the battery has an internal pole group short circuit or is hit or soaked in water, a large amount of high-temperature gas will be generated in a very short time and accumulate in the battery. Therefore, in order to improve the safety performance of the battery, an explosion-proof valve is usually installed on the battery. When the battery operates abnormally and generates gas inside, the gas can be discharged through the explosion-proof valve to avoid major safety accidents.

[0003] For batteries with a relatively long length, such as blade batteries, if the explosion-proof valve is set on the end cover of the battery shell, the gas transmission path will be long, which is not conducive to gas discharge. Therefore, the explosion-proof valve is usually set on the side of the battery shell to balance the gas transmission path during thermal runaway. However, the exhaust space between the side of the shell and the pole group is small, which will lead to a large gas transmission resistance inside the battery, which is not conducive to the rapid discharge of gas inside the battery, and there are safety hazards. Summary of the invention

[0004] In view of this, the present invention provides a battery and a battery pack to solve the problem that the exhaust space between the side of the shell and the electrode group is small, which will cause a large gas transmission resistance inside the battery, is not conducive to the rapid discharge of the gas inside the battery, and poses a safety hazard.

[0005] In a first aspect, the present invention provides a battery, comprising: an outer shell, forming a storage space inside; an explosion-proof valve, arranged on a side of the outer shell; a pole group, located in the storage space; a support member, arranged in the storage space, the support member is located between the side of the outer shell where the explosion-proof valve is arranged and the pole group; the support member comprises an annular body and a limiting portion, the limiting portion is supported on both sides of the inner circle of the annular body along the width direction of the annular body.

[0006] By providing a support member, which is supported between the side of the outer shell and the pole group, an exhaust space is reserved between the outer shell and the pole group, thereby reducing the gas transmission resistance, facilitating the rapid discharge of gas inside the battery, and ensuring the safety of the battery; and by providing a limiting portion, the two sides of the annular body are supported inside the annular body, avoiding the support member from being concave and deformed in the width direction, facilitating the assembly of the support member, and ensuring the exhaust effect of the center hole of the annular body.

[0007] In an optional embodiment, the limiting part includes a first section and a second section, the first end of the first section is connected to one side of the inner ring of the annular body, the first end of the second section is connected to the other side of the inner ring of the annular body, and the second end of the first section and the second end of the second section are arranged close to each other. The first section and the second section are arranged close to each other to ensure the supporting effect of the limiting part on the annular body as a whole; there is a gap between the second end of the first section and the second end of the second section, and during the exhaust process, when the gas reaches a predetermined pressure, the first section and the second section can be offset and moved respectively along the length direction, so that the center holes on both sides of the limiting part can be connected, so that the gas can be effectively discharged to the explosion-proof valve.

[0008] In an optional embodiment, the gap between the second end of the first subsection and the second end of the second subsection is less than 0.5 mm, so as to ensure that the first subsection and the second subsection can generate offset movement under a predetermined pressure and at the same time ensure the supporting effect of the first subsection and the second subsection on the annular body.

[0009] In an optional embodiment, the angle α between the side wall of the first sub-section and the inner ring of the annular body is greater than or equal to 120°, and / or the angle α between the side wall of the second sub-section and the inner ring of the annular body is greater than or equal to 120°. This prevents the gas from generating eddy currents at the connection between the side wall of the first sub-section and the inner ring of the annular body and at the connection between the side wall of the second sub-section and the inner ring of the annular body, thereby ensuring a smooth transition of the gas.

[0010] In an optional embodiment, the side wall of the first subsection is connected to the second end of the first subsection through an arc structure transition, and / or the side wall of the second subsection is connected to the second end of the second subsection through an arc structure transition. Therefore, the blocking effect of the first subsection and the second subsection on the gas is reduced, so that the gas can flow smoothly between the central holes on both sides of the limiting part.

[0011] In an optional embodiment, the limiting part is provided with one, and the limiting part is provided corresponding to the middle position of the annular body along the length direction; or, the limiting part is provided with a plurality of, and the plurality of limiting parts are provided at intervals along the length direction of the annular body. While ensuring the exhaust space of the center hole of the annular body, the supporting effect of the limiting part on the annular body is ensured.

[0012] In an optional embodiment, the length L of the battery is greater than or equal to 300 mm, and the width D of the battery is less than or equal to 30 mm. Therefore, the support member is applied to a battery with a longer length and a smaller width, so that the annular body has a longer length and a smaller width, and the middle position of the annular body along the length direction is prone to inward concave deformation. Therefore, by setting the limit part, support is provided to the annular body to prevent the annular body from deformation.

[0013] In an optional embodiment, the central hole of the annular body is arranged corresponding to the explosion-proof valve. Therefore, the gas in the battery can directly reach the explosion-proof valve after passing through the central hole of the annular body, which is convenient for the gas to pass through and be discharged.

[0014] In an optional embodiment, the support member further includes a protrusion, which is connected to the inner wall of the annular body and extends toward the central hole of the annular body, thereby ensuring the exhaust space of the central hole of the annular body and increasing the support area of ​​the support member between the housing and the pole group.

[0015] In a second aspect, the present invention further provides a battery pack, comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a schematic diagram of the overall structure of a battery according to an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the exploded structure of a battery according to an embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of a housing and an explosion-proof valve according to an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the structure of a pole group and a support member according to an embodiment of the present invention;

[0021] Figure 5 It is a structural schematic diagram of a support member according to an embodiment of the present invention;

[0022] Figure 6 for Figure 5 Schematic diagram of the main structure;

[0023] Figure 7It is a schematic diagram of the local structure of the limiting part of an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1. Shell; 101. Accommodating space; 102. Shell; 103. Cover plate; 104. Insulating protective film; 2. Explosion-proof valve; 3. Pole group; 4. Support member; 401. Ring body; 4011. Center hole; 402. Limiting part; 4021. First subdivision; 4022. Second subdivision; 403. Protrusion. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0027] Combine the following Figures 1 to 7 , describing an embodiment of the present invention.

[0028] According to an embodiment of the present invention, on the one hand, a battery is provided, comprising a housing 1, an explosion-proof valve 2, a pole group 3 and a support member 4. A receiving space 101 is formed inside the housing 1, the explosion-proof valve 2 is arranged on the side of the housing 1, and the pole group 3 is located in the receiving space 101. The support member 4 is arranged in the receiving space 101, and the support member 4 is located between the side of the housing 1 where the explosion-proof valve 2 is arranged and the pole group 3. The support member 4 comprises an annular body 401 and a limiting portion 402, and the limiting portion 402 is supported on both sides of the inner circle of the annular body 401 along the width direction of the annular body 401.

[0029] By providing a support member 4, which is supported between the side of the outer shell 1 and the pole group 3, an exhaust space is reserved between the outer shell 1 and the pole group 3, thereby reducing the gas transmission resistance, facilitating the rapid discharge of gas inside the battery, and ensuring the safety of the battery; and, by providing a limiting portion 402, the two sides of the annular main body 401 are supported inside the annular main body 401, avoiding the support member 4 from being concave and deformed in the width direction, facilitating the assembly of the support member 4, and ensuring the exhaust effect of the center hole 4011 of the annular main body 401.

[0030] It should be noted that the gas in the battery passes through the central hole 4011 of the annular body 401 and is discharged through the explosion-proof valve 2 .

[0031] It is worth noting that for batteries with a relatively large length and a relatively small width, such as blade batteries, the support member 4 is arranged on the side of the battery corresponding to the support member 4, so that the support member 4 is also a structure with a relatively large length and a relatively small width. If the support member 4 is processed by injection molding, it is not only costly, but also requires segmented injection molding due to process problems, which greatly increases the difficulty of assembly. Therefore, the support member 4 can be die-cut into a "U" shape (that is, a ring-shaped structure), which is low in cost and easy to form. However, due to the long length of the support member 4, the middle part of the support member 4 in the length direction will be concave inward, making the support member 4 inconvenient to assemble. Therefore, in this embodiment, the annular body 401 can be supported by setting the limit portion 402 to avoid deformation.

[0032] In one embodiment, Figures 5 to 7 As shown, the limiting portion 402 includes a first division 4021 and a second division 4022, the first end of the first division 4021 is connected to one side of the inner circle of the annular body 401, the first end of the second division 4022 is connected to the other side of the inner circle of the annular body 401, and the second end of the first division 4021 and the second end of the second division 4022 are arranged close to each other.

[0033] By arranging the first section 4021 and the second section 4022 close to each other, the overall supporting effect of the limiting section 402 on the annular body 401 is ensured; there is a gap between the second end of the first section 4021 and the second end of the second section 4022. During the exhaust process, when the gas reaches a higher pressure, the first section 4021 and the second section 4022 can be offset and moved respectively in the length direction, so that the center holes 4011 located on both sides of the limiting section 402 can be connected, so that the gas can be effectively discharged to the explosion-proof valve 2.

[0034] It is worth noting that when the gas pressure entering the central hole 4011 of the annular body 401 is relatively high, the gas will exert force on the first section 4021 and the second section 4022, causing the first section 4021 and the second section 4022 to produce an offset movement along the length direction, thereby increasing the distance between the first section 4021 and the second section 4022, so that the central holes 4011 on both sides of the limiting section 402 are connected.

[0035] It should be noted that the explosion-proof valve 2 can be opened when the gas pressure reaches a first preset pressure P1, and the first sub-portion 4021 and the second sub-portion 4022 can be offset when the gas pressure reaches a second preset pressure P2, and P2 is less than P1.

[0036] In one embodiment, the gap between the second end of the first subsection 4021 and the second end of the second subsection 4022 is less than 0.5 mm. Thus, while ensuring that the first subsection 4021 and the second subsection 4022 can generate an offset movement under a predetermined pressure, the first subsection 4021 and the second subsection 4022 can also provide a supporting effect on the annular body 401.

[0037] It is worth noting that if the distance between the first section 4021 and the second section 4022 is too large, it will be unable to provide effective support to both sides of the annular body 401 , resulting in a significant deformation of the annular body 401 .

[0038] In one embodiment, Figure 7 As shown, the angle α between the side wall of the first sub-section 4021 and the inner ring of the annular body 401 is greater than or equal to 120°, and the angle α between the side wall of the second sub-section 4022 and the inner ring of the annular body 401 is greater than or equal to 120°. This prevents the gas from generating eddy currents at the connection between the side wall of the first sub-section 4021 and the inner ring of the annular body 401 and at the connection between the side wall of the second sub-section 4022 and the inner ring of the annular body 401, thereby ensuring a smooth transition of the gas.

[0039] It is worth mentioning that please refer to Figure 6 and Figure 7 If the angle α is less than 120°, when the gas enters the right center hole 4011 from the left center hole 4011 or enters the left center hole 4011 from the right center hole 4011, the limiting portion 402 (the first division 4021 and the second division 4022) will cause a greater obstruction to the gas, causing the gas to generate vortices at the angle, affecting the circulation of the gas.

[0040] In one embodiment, Figure 7 As shown, the side wall of the first sub-portion 4021 is connected to the second end of the first sub-portion 4021 through an arc structure transition, and the side wall of the second sub-portion 4022 is connected to the second end of the second sub-portion 4022 through an arc structure transition. Therefore, the blocking effect of the first sub-portion 4021 and the second sub-portion 4022 on the gas is reduced, so that the gas can flow smoothly between the central holes 4011 located on both sides of the limiting portion 402.

[0041] In one embodiment, Figure 5 and Figure 6 As shown, one limiting portion 402 is provided, and one limiting portion 402 is provided corresponding to the middle position of the annular body 401 along the length direction. That is, one first sub-portion 4021 and one second sub-portion 4022 are provided respectively, and the first sub-portion 4021 is provided corresponding to the middle position of one side of the inner circle of the annular body 401, and the second sub-portion 4022 is provided corresponding to the middle position of the other side of the inner circle of the annular body 401, so that the first sub-portion 4021 and the second sub-portion 4022 are provided opposite to each other.

[0042] Of course, in other alternative embodiments, a plurality of limiters 402 may be provided, and the plurality of limiters 402 are spaced apart along the length direction of the annular body 401. While ensuring the exhaust space of the central hole 4011 of the annular body 401, the support effect of the limiters 402 on the annular body 401 is ensured.

[0043] It is worth noting that one limiting portion 402 or several limiting portions 402 are arranged corresponding to the weak position of the annular body 401, so as to play a supporting role.

[0044] In one embodiment, see Figure 6 and Figure 7 The first section 4021 and the second section 4022 are symmetrically arranged along the transverse center line of the annular body 401 .

[0045] In one embodiment, the length L of the battery is greater than or equal to 300 mm, and the width D of the battery is less than or equal to 30 mm. Therefore, the support member 4 is applied to a battery with a larger length and a smaller width, so that the annular body 401 has a larger length and a smaller width, and the middle position of the annular body 401 along the length direction is easy to be concave and deformed inwards. Therefore, by setting the limiting portion 402, support is provided to the annular body 401 to prevent the annular body 401 from being deformed.

[0046] In one embodiment, see Figures 1 to 4 The center hole 4011 of the annular body 401 is arranged corresponding to the explosion-proof valve 2. Therefore, the gas in the battery can directly reach the explosion-proof valve 2 after passing through the center hole 4011 of the annular body 401, which is convenient for the gas to be discharged.

[0047] In one embodiment, Figure 5 and Figure 6 As shown, the support member 4 further includes a protrusion 403, which is connected to the inner wall of the annular body 401 and extends toward the central hole 4011 of the annular body 401. While ensuring the exhaust space of the central hole 4011 of the annular body 401, the support area of ​​the support member 4 between the housing 1 and the pole group 3 is increased.

[0048] It is worth noting that when the supporting area of ​​the support member 4 is too small, the supporting strength of the support member 4 is insufficient to ensure that a stable exhaust space is formed between the outer shell 1 and the pole group 3. However, if the supporting area of ​​the support member 4 is increased, that is, the ring width of the annular body 401 is increased, the area of ​​the center hole 4011 will be reduced as a whole, which is not conducive to exhaust. Therefore, in this embodiment, a number of protrusions 403 are arranged in sequence and at intervals along the length direction of the inner ring of the annular body 401 to increase the supporting area, and the area of ​​the center hole 4011 will not be reduced as a whole, thereby ensuring the exhaust effect. For further information, please refer to Figure 6 The plurality of protrusions 403 located on one side of the inner circle of the annular body 401 are staggered with the plurality of protrusions 403 located on the other side of the inner circle of the annular body 401, thereby avoiding gas obstruction caused by the relative arrangement of the two protrusions 403.

[0049] In one embodiment, Figures 1 to 3 As shown, two explosion-proof valves 2 are provided. The two explosion-proof valves 2 are respectively provided corresponding to the two central holes 4011 located on both sides of the limiting portion 402.

[0050] Of course, in other alternative implementations, the explosion-proof valves 2 may also be provided in other numbers, such as one, three, four, etc. The number of explosion-proof valves 2 may be specifically set according to design requirements.

[0051] In one embodiment, Figure 1 As shown, the housing 1 is a closed structure, thereby enclosing a receiving space 101. Specifically, the housing 1 includes a shell 102 and a cover plate 103. The shell 102 is provided with openings at both ends, and two cover plates 103 are provided, and the two cover plates 103 respectively close the two openings at both ends of the shell 102.

[0052] Of course, in other alternative embodiments, one end of the shell 102 is open, and the other end of the shell 102 is closed, and a cover plate 103 is provided, and a cover plate 103 is closed at the opening of one end of the shell 102.

[0053] It should be noted that the cover plate 103 is electrically connected to the electrode group 3 .

[0054] In one embodiment, Figure 2 As shown, the housing 1 further includes an insulating protective film 104 , which is disposed between the inner surface of the housing 102 and the side surface of the pole group 3 to insulate the pole group 3 from the housing 102 .

[0055] It is worth mentioning that please refer to Figure 2 , the insulating protection film 104 is arranged on the outside of the support member 4.

[0056] It should be further explained that when the battery needs to be exhausted, the battery is in a high temperature and high pressure state, and at this time, the provision of the insulating protective film 104 will not affect the exhaust of the gas.

[0057] According to another aspect of an embodiment of the present invention, a battery pack is provided, comprising the above-mentioned battery.

[0058] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: The outer shell forms a receiving space inside; An explosion-proof valve, arranged on a side of the housing; A pole group, located in the accommodation space; A support member is arranged in the accommodating space, and is located between the side of the housing where the explosion-proof valve is arranged and the pole group; the support member comprises an annular body and a limiting portion, and the limiting portion is supported on both sides of the inner ring of the annular body along the width direction of the annular body; The limiting portion includes a first sub-section and a second sub-section, wherein a first end of the first sub-section is connected to one side of the inner ring of the annular body, a first end of the second sub-section is connected to the other side of the inner ring of the annular body, and a second end of the first sub-section and a second end of the second sub-section are arranged close to each other; The gap between the second end of the first subdivision and the second end of the second subdivision is less than 0.5 mm; The included angle α between the side wall of the first section and the inner circle of the annular body is greater than or equal to 120°, and the included angle α between the side wall of the second section and the inner circle of the annular body is greater than or equal to 120°; The side wall of the first section is transitionally connected to the second end of the first section via an arc structure, and the side wall of the second section is transitionally connected to the second end of the second section via an arc structure.

2. The battery according to claim 1, characterized in that The limiting portion is provided with one, and the limiting portion is provided corresponding to the middle position of the annular body along the length direction; or, A plurality of the limiting portions are provided, and the plurality of the limiting portions are arranged at intervals along the length direction of the annular body.

3. The battery according to claim 1, characterized in that The length L of the battery is greater than or equal to 300 mm, and the width D of the battery is less than or equal to 30 mm.

4. The battery according to claim 1, characterized in that The central hole of the annular body is arranged corresponding to the explosion-proof valve.

5. The battery according to claim 1, characterized in that The support member further includes a protrusion connected to the inner wall of the annular body and extending toward the central hole of the annular body.

6. A battery pack, characterized in that: A battery comprising the battery according to any one of claims 1 to 5.

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