A single cell and a battery pack

Abstract

The application discloses a single battery and a battery pack, and relates to the field of batteries. The single battery comprises a shell, an explosion-proof valve, a top cover, an electrode assembly, a support and an insulating piece. The shell is provided with an opening and an explosion-proof valve hole at opposite ends thereof; the explosion-proof valve hole is covered by an explosion-proof valve cover; the top cover is connected to the shell and covers the opening; the electrode assembly is arranged in the shell, and the electrode assembly is provided with a first recess at one end close to the explosion-proof valve; the support is arranged at one end of the electrode assembly close to the explosion-proof valve, and the support is provided with a first filling part located in the first recess at one side close to the electrode assembly; the support is provided with a second recess at one side close to the explosion-proof valve; the insulating piece is arranged in the shell and wraps the electrode assembly and the support, and the insulating piece is provided with a bottom surface insulating layer between the explosion-proof valve and the support, and the bottom surface insulating layer is provided with a second filling part located in the second recess at one side away from the explosion-proof valve. The single battery provided by the application improves the exhaust efficiency and reduces the probability of explosion of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single cell battery and a battery pack. Background Technology

[0002] With the continuous development of the new energy vehicle industry, the requirements for battery energy density and safety in new energy vehicles are becoming increasingly stringent. To improve the safety of new energy vehicles, batteries currently typically employ a thermoelectric separation scheme with the terminals and explosion-proof valves on opposite sides.

[0003] Batteries often use support components to separate the bottom wall of the battery from the internal cells. When the battery adopts a thermoelectric separation scheme with the terminals facing upwards and the explosion-proof valve facing downwards, the cells press the support components tightly against the bottom wall of the battery due to their own weight. This can easily cause the explosion-proof valve to be blocked by the support components, thereby reducing the venting efficiency. It can also easily cause gas to accumulate in the top cover area of ​​the cells, causing the top cover to burst open, affecting the safety performance of new energy vehicles. Utility Model Content

[0004] In order to achieve the above objectives, this application aims to provide a single-cell battery that solves the technical problem in the prior art where the explosion-proof valve is easily blocked by the support member, resulting in reduced exhaust efficiency and the top cover bursting open, thus causing the battery to easily explode.

[0005] The technical solution adopted is as follows: In a first aspect, embodiments of this application provide a single-cell battery, comprising: The housing has an opening and an explosion-proof valve port, the opening and the explosion-proof valve port being located at opposite ends of the housing, respectively; Explosion-proof valve, cover the explosion-proof valve orifice; Top cover, connecting to the housing and sealing the opening; An electrode assembly is disposed within the housing, and a first recess is provided at one end of the electrode assembly near the explosion-proof valve; A support member is disposed at one end of the electrode assembly near the explosion-proof valve. The support member has a first filling portion on the side near the electrode assembly, which is disposed in the first recess. The support member also has a second recess on the side near the explosion-proof valve. An insulating component is disposed within the housing and encloses the electrode assembly and the support component. The insulating component has a bottom insulating layer located between the explosion-proof valve and the support component. A second filling portion is provided on the side of the bottom insulating layer away from the explosion-proof valve, and the second filling portion is disposed within the second recess.

[0006] In one embodiment of the first aspect, the support member has a first vent groove on the side near the electrode assembly. The first vent groove has a bottom wall and a first vent hole. The bottom insulating layer has a second vent hole. The bottom insulating layer has a second vent groove on the side near the support member. The second vent groove is connected to the first vent hole and the second vent hole respectively. The second vent hole is connected to the explosion-proof valve hole.

[0007] In one embodiment of the first aspect, a third vent groove is provided on the side of the bottom insulating layer near the explosion-proof valve, and the second vent hole is spaced apart from the explosion-proof valve hole, and the second vent hole communicates with the explosion-proof valve hole through the third vent groove.

[0008] In one embodiment of the first aspect, the single cell has a first direction and a second direction perpendicular to each other, and the electrode assembly includes a first wound electrode body and a second wound electrode body disposed adjacent to each other along the second direction. The first wound electrode body has a first arcuate portion at one end near the explosion-proof valve, and the second wound electrode body has a second arcuate portion at one end near the explosion-proof valve. A first recess is formed between the first arcuate portion and the second arcuate portion.

[0009] In one embodiment of the first aspect, multiple first exhaust channels and multiple second exhaust channels are provided, and the multiple first exhaust channels and multiple second exhaust channels are all extended along the first direction and are spaced apart along the second direction.

[0010] In one embodiment of the first aspect, the bottom wall of each first exhaust groove is provided with a plurality of first exhaust holes, and the plurality of first exhaust holes are spaced apart along the first direction.

[0011] In one embodiment of the first aspect, a confluence groove is provided on the side of the bottom insulating layer near the support member. The confluence groove extends along the second direction and is respectively connected to a plurality of second exhaust grooves and second exhaust holes.

[0012] In one embodiment of the first aspect, the bottom insulating layer is provided with a second filling portion adapted to the second recess on the side near the support member, and the bottom insulating layer is provided with a third recess on the side near the explosion-proof valve, the third recess being connected to the second vent hole and the explosion-proof valve hole respectively.

[0013] In one embodiment of the first aspect, the bottom insulating layer includes a first bottom insulating layer and a second bottom insulating layer, the second vent has a first sub-vent and a second sub-vent, the first bottom insulating layer has a second filling portion and the third recess, and has the first sub-vent, the second bottom insulating layer is disposed on the side of the first bottom insulating layer near the explosion-proof valve, and has the second sub-vent, the first sub-vent communicates with the second vent groove and the third recess, and the second sub-vent communicates with the third recess and the explosion-proof valve hole.

[0014] In one embodiment of the first aspect, a third vent groove is provided on the side of the second bottom insulating layer near the explosion-proof valve, the second sub-vent hole is spaced apart from the explosion-proof valve hole, and the second sub-vent hole is connected to the explosion-proof valve hole through the third vent groove.

[0015] Secondly, embodiments of this application also provide a battery pack, including the single battery cells described in any of the above embodiments.

[0016] The beneficial effects of this application are as follows: This application proposes a single-cell battery. By providing a first recess at the end of the electrode assembly near the explosion-proof valve and a first filling portion within the first recess on the side of the support member near the electrode assembly, the contact area and venting space between the end of the electrode assembly near the explosion-proof valve and the side of the support member near the electrode assembly are effectively increased, thereby improving the venting efficiency of the support member for the electrode assembly. Simultaneously, by providing a second recess on the side of the support member near the explosion-proof valve and a second filling portion within the second recess on the side of the bottom insulating layer of the insulating member away from the explosion-proof valve, the contact area and venting space between the side of the support member near the explosion-proof valve and the side of the bottom insulating layer away from the explosion-proof valve are effectively increased, thereby improving the venting efficiency of the bottom insulating layer for the support member, and further improving the venting efficiency for the electrode assembly, effectively reducing the probability of battery explosion. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A perspective view of a single cell in some embodiments of this application is shown; Figure 2 An exploded view of a single cell in some embodiments of this application is shown; Figure 3 This paper shows an exploded view of a single cell in some embodiments of this application. Figure 4 This application shows a perspective view of the insulating element in some embodiments. Figure 1 ; Figure 5 This application shows a perspective view of the insulating element in some embodiments. Figure 1 ; Figure 6 This application shows a perspective view of the insulating element in some embodiments. Figure 2 ; Figure 7 This application shows a perspective view of the insulating element in some embodiments. Figure 2 ; Figure 8 This application shows a perspective view of the insulating element in some embodiments. Figure 3 ; Figure 9 This application shows a perspective view of the insulating element in some embodiments. Figure 3 ; Figure 10 A cross-sectional perspective view of the insulating member and the supporting member in some embodiments of this application is shown; Figure 11 It shows Figure 10 Enlarged schematic diagram of the structure of section A in the middle.

[0019] Explanation of key component symbols: 100-cell battery; 110 - Housing; 111 - Explosion-proof valve port; 112 - Opening; 120 - Top Cover; 130 - Electrode assembly; 131 - First wound electrode body; 1311 - First arc-shaped portion; 132 - Second wound electrode body; 1321 - Second arc-shaped portion; 133 - First recessed portion; 140 - Support member; 141 - First filling part; 142 - Second recessed part; 143 - First venting groove; 1431 - Bottom wall; 144 - First venting hole; 150 - Insulating component; 151 - Bottom insulating layer; 15101 - First bottom insulating layer; 15102 - Second bottom insulating layer; 1511 - Second filling portion; 1512 - Second vent hole; 15121 - First sub-vent hole; 15122 - Second sub-vent hole; 1513 - Second vent groove; 1514 - Third vent groove; 1515 - Combining groove; 1516 - Third recess; 160 - Explosion-proof valve; X - First direction; Y - Second direction. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein 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 accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should 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", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] like Figure 1 and Figure 2 As shown, an embodiment of this application provides a single-cell battery 100, which is mainly used in battery packs. The single-cell battery 100 includes a housing 110, an explosion-proof valve 160, a top cover 120, an electrode assembly 130, a support member 140, and an insulating member 150.

[0026] See also Figure 3 The housing 110 has openings 112 and explosion-proof valve holes 111 located at opposite ends of the housing 110. An explosion-proof valve 160 covers the explosion-proof valve holes 111. A top cover 120 is connected to the housing 110 and covers the openings 112. An electrode assembly 130 is disposed inside the housing 110. A first recess 133 is provided at one end of the electrode assembly 130 near the explosion-proof valve 160. A support member 140 is disposed at one end of the electrode assembly 130 near the explosion-proof valve 160. A first filling portion 141 is provided on the side of the support member 140 near the electrode assembly 130, and the first filling portion 141 is disposed within the first recess 133. A second recess 142 is provided on the side of the support member 140 near the explosion-proof valve 160.

[0027] The insulating component 150 is disposed inside the housing 110 and encloses the electrode assembly 130 and the support component 140. The insulating component 150 has a bottom insulating layer 151 located between the explosion-proof valve 160 and the support component 140. A second filling part 1511 is provided on the side of the bottom insulating layer 151 away from the explosion-proof valve 160. The second filling part 1511 is disposed in the second recess 142.

[0028] The single-cell battery 100 provided in the embodiments of this application effectively increases the contact area and exhaust space between the end of the electrode assembly 130 near the explosion-proof valve 160 and the side of the support member 140 near the electrode assembly 130, by providing a first recess 133 and a first filling part 141 located in the first recess 133. This is beneficial to improving the exhaust efficiency of the support member 140 on the electrode assembly 130. Meanwhile, by providing a second recess 142 on the side of the support member 140 near the explosion-proof valve 160, and providing a second filling portion 1511 located in the second recess 142 on the side of the bottom insulating layer 151 of the insulating member 150 away from the explosion-proof valve 160, the contact area and exhaust space between the side of the support member 140 near the explosion-proof valve 160 and the side of the bottom insulating layer 151 away from the explosion-proof valve 160 are effectively increased. This helps to improve the exhaust efficiency of the bottom insulating layer 151 on the support member 140, and further improves the exhaust efficiency of the electrode assembly 130, effectively reducing the probability of battery explosion.

[0029] For example, the support member 140 can be integrally formed by stamping or injection molding to form the first filling portion 141 and the second recessed portion 142, and the bottom insulating layer 151 can be integrally formed by injection molding or stamping to form the second filling portion 1511.

[0030] like Figure 4 , Figure 10 and Figure 11 As shown, in one embodiment of this application, the support member 140 has a first exhaust groove 143 on the side near the electrode assembly 130. The first exhaust groove 143 has a bottom wall 1431 with a first exhaust hole 144. The bottom insulating layer 151 has a second exhaust hole 1512. The bottom insulating layer 151 has a second exhaust groove 1513 on the side near the support member 140. The second exhaust groove 1513 is connected to the first exhaust hole 144 and the second exhaust hole 1512 respectively. The second exhaust hole 1512 is connected to the explosion-proof valve hole 111.

[0031] In this embodiment, by opening a first exhaust groove 143 on the side of the support member 140 near the electrode assembly 130, opening a first exhaust hole 144 on the bottom wall 1431 of the first exhaust groove 143, and opening a second exhaust groove 1513 communicating with the first exhaust hole 144 on the side of the bottom insulating layer 151 near the support member 140, the gas generated by the thermal runaway of the electrode assembly 130 can be quickly discharged from the first exhaust groove 143 into the second exhaust groove 1513 through the first exhaust hole 144.

[0032] Meanwhile, by opening a second vent hole 1512 on the bottom insulating layer 151 that is connected to the second vent groove 1513 and the explosion-proof valve hole 111 respectively, the gas can be quickly discharged from the second vent groove 1513 into the explosion-proof valve hole 111 through the second vent hole 1512 and then quickly discharged through the explosion-proof valve hole 111, which effectively improves the venting efficiency of the electrode assembly 130 and reduces the probability of battery explosion.

[0033] like Figure 3 and Figure 5 As shown in the above embodiment of this application, a third vent groove 1514 is provided on the side of the bottom insulating layer 151 near the explosion-proof valve 160, and a second vent hole 1512 is spaced apart from the explosion-proof valve hole 111. The second vent hole 1512 is connected to the explosion-proof valve hole 111 through the third vent groove 1514.

[0034] In this embodiment, the second vent hole 1512 and the explosion-proof valve hole 111 are spaced apart. By opening a third vent groove 1514 on the side of the bottom insulating layer 151 near the explosion-proof valve 160, the spaced second vent hole 1512 and the explosion-proof valve hole 111 are connected through the third vent groove 1514. This allows gas to be quickly discharged from the second vent groove 1513 through the second vent hole 1512 into the third vent groove 1514. After being discharged into the third vent groove 1514, the gas can be quickly discharged along the third vent groove 1514 into the explosion-proof valve hole 111 and then quickly discharged through the explosion-proof valve hole 111.

[0035] Specifically, such as Figure 1 and Figure 3 As shown in the above embodiments of this application, the single cell 100 has a first direction X and a second direction Y that are perpendicular to each other. The electrode assembly 130 includes a first wound electrode body 131 and a second wound electrode body 132 that are arranged adjacent to each other along the second direction Y. The first wound electrode body 131 has a first arc-shaped portion 1311 at the end near the explosion-proof valve 160, and the second wound electrode body 132 has a second arc-shaped portion 1321 at the end near the explosion-proof valve 160. A first recess 133 is formed between the first arc-shaped portion 1311 and the second arc-shaped portion 1321, which helps to increase the contact area and exhaust space between the end of the electrode assembly 130 near the explosion-proof valve 160 and the side of the support member 140 near the electrode assembly 130, thereby improving the exhaust efficiency of the support member 140 on the electrode assembly 130.

[0036] like Figure 4 and Figure 11 As shown in the above embodiments of this application, multiple first exhaust grooves 143 and multiple second exhaust grooves 1513 are provided. Multiple first exhaust grooves 143 and multiple second exhaust grooves 1513 are all extended along the first direction X and are spaced apart along the second direction Y. The positions of multiple first exhaust grooves 143 and multiple second exhaust grooves 1513 correspond one-to-one.

[0037] In this embodiment, by setting multiple first exhaust channels 143 and multiple second exhaust channels 1513, and by arranging all multiple first exhaust channels 143 and multiple second exhaust channels 1513 extending along the first direction X and spaced apart along the second direction Y, the exhaust space of the support member 140 and the bottom insulating layer 151 is effectively increased, improving the exhaust efficiency of the electrode assembly 130 and reducing the probability of battery explosion. Simultaneously, by setting the positions of multiple first exhaust channels 143 and multiple second exhaust channels 1513 in a one-to-one correspondence, each first exhaust channel 143 can discharge gas into the second exhaust channel 1513 corresponding to its position.

[0038] like Figure 4 and Figure 11As shown in the above embodiments of this application, each first exhaust groove 143 has a plurality of first exhaust holes 144 on its bottom wall 1431, and the plurality of first exhaust holes 144 are arranged at intervals along the first direction X.

[0039] In this embodiment, by opening multiple first exhaust holes 144 on the bottom wall 1431 of each first exhaust groove 143 and arranging the multiple first exhaust holes 144 at intervals along the first direction X, the gas in the first exhaust groove 143 can be quickly discharged into the second exhaust groove 1513 through the multiple first exhaust holes 144, which further improves the exhaust efficiency of the support member 140 to the electrode assembly 130.

[0040] like Figure 4 and Figure 11 As shown in the above embodiment of this application, a manifold 1515 is provided on the side of the bottom insulating layer 151 near the support member 140. The manifold 1515 extends along the second direction Y and is connected to a plurality of second exhaust grooves 1513 and second exhaust holes 1512 respectively.

[0041] In this embodiment, a confluence groove 1515 is formed on the side of the bottom insulating layer 151 near the support member 140 along the second direction Y, and the confluence groove 1515 is connected to a plurality of second exhaust grooves 1513 and second exhaust holes 1512 respectively, so as to play a confluence role, so that the gas in the plurality of second exhaust grooves 1513 can be quickly discharged into the second exhaust hole 1512 after being confluent through the confluence groove 1515, and then quickly discharged into the explosion-proof valve hole 111 through the second exhaust hole 1512 and then quickly discharged through the explosion-proof valve hole 111.

[0042] like Figure 6 and Figure 7 As shown in the above embodiment of this application, the bottom insulating layer 151 is provided with a second filling part 1511 adapted to the second recess 142 on the side near the support member 140, and a third recess 1516 is provided on the side of the bottom insulating layer 151 near the explosion-proof valve 160. The third recess 1516 is connected to the second exhaust hole 1512 and the explosion-proof valve hole 111 respectively.

[0043] In this embodiment, the bottom insulating layer 151 is provided with a second filling portion 1511 that is adapted to the second recess 142 on the side near the support member 140. By providing a third recess 1516 that communicates with the second vent hole 1512 and the vent hole 111 respectively on the side of the bottom insulating layer 151 near the explosion-proof valve 160, the presence of the third recess 1516 effectively increases the venting space between the side of the bottom insulating layer 151 near the explosion-proof valve 160 and the explosion-proof valve 160, thereby further improving the venting efficiency of the bottom insulating layer 151 on the support member 140, and further improving the venting efficiency of the electrode assembly 130, thereby further reducing the probability of battery explosion.

[0044] Specifically, the second vent 1512 and the explosion-proof valve hole 111 are spaced apart. A third recess 1516 is provided on the side of the bottom insulating layer 151 near the explosion-proof valve 160, which communicates with the second vent 1512 and the explosion-proof valve hole 111 respectively. This allows the spaced-apart second vent 1512 and explosion-proof valve hole 111 to communicate through the third recess 1516, so that gas can be quickly discharged from the second vent groove 1513 through the second vent 1512 into the third recess 1516. After being discharged into the third recess 1516, the gas can be quickly discharged along the third recess 1516 into the explosion-proof valve hole 111 and then quickly discharged through the explosion-proof valve hole 111.

[0045] For example, the bottom insulating layer 151 can be integrally formed by injection molding or stamping to form the second filling portion 1511 and the third recessed portion 1516.

[0046] like Figure 8 and Figure 9 As shown, in the above embodiments of this application, the bottom insulating layer 151 includes a first bottom insulating layer 15101 and a second bottom insulating layer 15102. The second vent 1512 has a first sub-vent 15121 and a second sub-vent 15122. The first bottom insulating layer 15101 is provided with a second filling portion 1511 and a third recessed portion 1516, and has a first sub-vent 15121. The second bottom insulating layer 15102 is disposed on the side of the first bottom insulating layer 15101 near the explosion-proof valve 160, and has a second sub-vent 15122. The first sub-vent 15121 is connected to the second vent groove 1513 and the third recessed portion 1516 respectively, and the second sub-vent 15122 is connected to the third recessed portion 1516 and the explosion-proof valve hole 111 respectively.

[0047] In this embodiment, the first bottom insulating layer 15101 is provided with a second filling portion 1511 and a third recessed portion 1516. By setting the second bottom insulating layer 15102 on the side of the first bottom insulating layer 15101 close to the explosion-proof valve 160, the second bottom insulating layer 15102 and the third recessed portion 1516 form a gas storage space, which effectively increases the exhaust path of gas in the battery, thereby increasing the residence time of gas in the battery. This helps to reduce the temperature of the gas discharged from the explosion-proof valve orifice 111, and avoids the temperature of the discharged gas being too high, which may affect the safety of the battery pack or new energy vehicle.

[0048] The first bottom insulating layer 15101 and the second bottom insulating layer 15102 are respectively provided with a first sub-vent hole 15121 and a second sub-vent hole 15122. The first sub-vent hole 15121 is connected to the second vent groove 1513 and the third recess 1516 respectively. The second sub-vent hole 15122 is connected to the third recess 1516 and the explosion-proof valve hole 111 respectively. This allows the gas to be quickly discharged from the second vent groove 1513 into the gas storage space formed by the second bottom insulating layer 15102 and the third recess 1516 through the first sub-vent hole 15121. After the gas is cooled in the storage space, it is quickly discharged into the explosion-proof valve hole 111 through the second sub-vent hole 15122 and then quickly discharged through the explosion-proof valve hole 111.

[0049] like Figure 9 As shown in the above embodiment of this application, a third exhaust groove 1514 is provided on the side of the second bottom insulating layer 15102 near the explosion-proof valve 160, and a second sub-exhaust hole 15122 is spaced apart from the explosion-proof valve hole 111. The second sub-exhaust hole 15122 is connected to the explosion-proof valve hole 111 through the third exhaust groove 1514.

[0050] In this embodiment, the second sub-exhaust port 15122 and the explosion-proof valve port 111 are spaced apart. By opening a third exhaust groove 1514 on the side of the second bottom insulating layer 15102 near the explosion-proof valve 160, the spaced second sub-exhaust port 15122 and the explosion-proof valve port 111 are connected through the third exhaust groove 1514. This allows gas to be quickly discharged from the second exhaust groove 1513 through the first sub-exhaust port 15121 into the gas storage space formed by the second bottom insulating layer 15102 and the third recess 1516. After cooling in the storage space, the gas is quickly discharged into the third exhaust groove 1514 through the second sub-exhaust port 15122. After being discharged into the third exhaust groove 1514, the gas can be quickly discharged into the explosion-proof valve port 111 along the third exhaust groove 1514 and then quickly discharged through the explosion-proof valve port 111.

[0051] Embodiments of this application also provide a battery pack, including the single battery cell 100 in any of the above embodiments.

[0052] The battery pack has the single cell 100 of any of the above embodiments, and therefore has all the beneficial effects of the single cell 100, which will not be described in detail here.

[0053] The battery pack has a housing and at least one individual battery cell 100 as described in any of the above embodiments, the individual battery cell 100 being disposed within the housing. When there are multiple individual batteries cell 100, the multiple individual batteries cell 100 can be connected in series or in parallel, or in a combination of series and parallel connections.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A single-cell battery, characterized in that, include: The housing (110) has an opening (112) and an explosion-proof valve hole (111), the opening (112) and the explosion-proof valve hole (111) being located at opposite ends of the housing (110); Explosion-proof valve (160), covering the explosion-proof valve hole (111); Top cover (120) connects to the housing (110) and seals the opening (112). An electrode assembly (130) is disposed inside the housing (110), and a first recess (133) is provided at one end of the electrode assembly (130) near the explosion-proof valve (160). A support member (140) is disposed at one end of the electrode assembly (130) near the explosion-proof valve (160). The support member (140) is provided with a first filling part (141) on the side near the electrode assembly (130), the first filling part (141) is disposed in the first recess (133), and the support member (140) is provided with a second recess (142) on the side near the explosion-proof valve (160). An insulating element (150) is disposed within the housing (110) and encloses the electrode assembly (130) and the support member (140). The insulating element (150) has a bottom insulating layer (151) located between the explosion-proof valve (160) and the support member (140). A second filling portion (1511) is provided on the side of the bottom insulating layer (151) away from the explosion-proof valve (160). The second filling portion (1511) is disposed within the second recess (142).

2. The single-cell battery according to claim 1, characterized in that, The support member (140) has a first exhaust groove (143) on the side near the electrode assembly (130). The first exhaust groove (143) has a bottom wall (1431) with a first exhaust hole (144). The bottom insulating layer (151) has a second exhaust hole (1512). The bottom insulating layer (151) has a second exhaust groove (1513) on the side near the support member (140). The second exhaust groove (1513) is connected to the first exhaust hole (144) and the second exhaust hole (1512) respectively. The second exhaust hole (1512) is connected to the explosion-proof valve hole (111).

3. The single-cell battery according to claim 2, characterized in that, The bottom insulating layer (151) has a third vent groove (1514) on the side near the explosion-proof valve (160). The second vent hole (1512) is spaced apart from the explosion-proof valve hole (111). The second vent hole (1512) is connected to the explosion-proof valve hole (111) through the third vent groove (1514).

4. The single-cell battery according to claim 2, characterized in that, The single cell (100) has a first direction (X) and a second direction (Y) that are perpendicular to each other. The electrode assembly (130) includes a first wound electrode body (131) and a second wound electrode body (132) that are adjacent to each other along the second direction (Y). The first wound electrode body (131) has a first arc-shaped portion (1311) at one end near the explosion-proof valve (160), and the second wound electrode body (132) has a second arc-shaped portion (1321) at one end near the explosion-proof valve (160). The first recess (133) is formed between the first arc-shaped portion (1311) and the second arc-shaped portion (1321).

5. The single-cell battery according to claim 4, characterized in that, The first exhaust groove (143) and the second exhaust groove (1513) are provided in multiple ways. The multiple first exhaust grooves (143) and the multiple second exhaust grooves (1513) are all extended along the first direction (X) and are all spaced apart along the second direction (Y).

6. The single-cell battery according to claim 5, characterized in that, Each of the first exhaust slots (143) has a plurality of first exhaust holes (144) on its bottom wall (1431), and the plurality of first exhaust holes (144) are spaced apart along the first direction (X).

7. The single-cell battery according to claim 5, characterized in that, The bottom insulating layer (151) has a manifold (1515) on the side near the support member (140). The manifold (1515) extends along the second direction (Y) and is connected to a plurality of second exhaust grooves (1513) and second exhaust holes (1512).

8. The single-cell battery according to claim 2, characterized in that, The bottom insulating layer (151) has a second filling part (1511) adapted to the second recess (142) on the side near the support member (140), and the bottom insulating layer (151) has a third recess (1516) on the side near the explosion-proof valve (160). The third recess (1516) is connected to the second exhaust hole (1512) and the explosion-proof valve hole (111) respectively.

9. The single-cell battery according to claim 8, characterized in that, The bottom insulating layer (151) includes a first bottom insulating layer (15101) and a second bottom insulating layer (15102). The second vent (1512) has a first sub-vent (15121) and a second sub-vent (15122). The first bottom insulating layer (15101) is provided with a second filling portion (1511) and the third recess (1516), and has the first sub-vent (15121). The second bottom insulating layer (15102) is located on the side of the first bottom insulating layer (15101) near the explosion-proof valve (160), and has the second sub-vent (15122). The first sub-vent (15121) is connected to the second vent groove (1513) and the third recess (1516) respectively. The second sub-vent (15122) is connected to the third recess (1516) and the explosion-proof valve hole (111) respectively.

10. The single-cell battery according to claim 9, characterized in that, The second bottom insulating layer (15102) has a third vent groove (1514) on the side near the explosion-proof valve (160). The second sub-vent hole (15122) is spaced apart from the explosion-proof valve hole (111). The second sub-vent hole (15122) is connected to the explosion-proof valve hole (111) through the third vent groove (1514).

11. A battery pack, characterized in that, Includes the single cell (100) according to any one of claims 1 to 10.

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