Battery monomer and battery

Abstract

The utility model provides a battery monomer and a battery, and relates to the technical field of batteries. The battery monomer comprises a shell with an accommodating cavity and an opening, and a cover plate assembly comprising a cover plate, an anti-explosion valve and a plastic part, the cover plate is connected to the shell to seal the opening, the plastic part is located in the containing cavity and comprises a first plastic part connected to the cover plate and a second plastic part connected to the side, away from the cover plate, of the first plastic part, the first plastic part, the second plastic part and the cover plate define an exhaust channel, and the anti-explosion valve is connected to the cover plate. One side of the second plastic part is provided with a first exhaust port communicated with the containing cavity, the other side of the second plastic part is provided with a second exhaust port communicated with the containing cavity, and the exhaust channel is communicated with the first exhaust port and the second exhaust port. According to the battery monomer provided by the invention, the areas on the two sides of the plastic part are communicated with each other, so that evacuation of high-temperature and high-pressure gas is facilitated, and the safety of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer and a battery. BACKGROUND

[0002] The information disclosed in this BACKGROUND section is only for the purpose of enhancing the understanding of the general background of the disclosure and should not be taken as admitting or implying that the information forms the prior art that is already known to those of ordinary skill in the art.

[0003] The battery monomer is an important component unit of a power battery and an energy storage battery. An explosion-proof valve and an exhaust passage are usually arranged on a cover plate assembly of the battery monomer, so that the battery monomer can exhaust high-temperature and high-pressure gas in an extreme case, so as to reduce the risk of thermal runaway. However, the two side regions of the plastic part of the cover plate assembly are not connected to each other, which is not conducive to the dispersion of high-temperature and high-pressure gas, resulting in low safety of the battery monomer. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the purpose of the present application is to provide a battery monomer and a battery, which aims to solve the technical problem of low safety of the battery monomer.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] In a first aspect, the embodiments of the present application provide a battery monomer, which has a first direction, a second direction and a third direction perpendicular to each other, and the battery monomer comprises:

[0007] a housing having a receiving cavity and an opening in communication;

[0008] a cover plate assembly comprising a cover plate, an explosion-proof valve and a plastic part, the cover plate being connected to the housing to cover the opening, the plastic part being located in the receiving cavity and comprising a first plastic part and a second plastic part, the first plastic part being connected to the cover plate, the second plastic part being connected to one side of the first plastic part away from the cover plate along the third direction, the first plastic part, the second plastic part and the cover plate forming an exhaust passage, the exhaust passage being in communication with the receiving cavity along the third direction, the explosion-proof valve being connected to the cover plate and being arranged correspondingly to the exhaust passage, one side of the second plastic part along the first direction being provided with a first exhaust port in communication with the receiving cavity, the other side of the second plastic part along the first direction being provided with a second exhaust port in communication with the receiving cavity, the exhaust passage being in communication with the first exhaust port and the second exhaust port along the first direction, respectively.

[0009] In one of the embodiments of the first aspect, the first exhaust port comprises a plurality of first exhaust holes, the plurality of first exhaust holes are arranged along the second direction, and each of the first exhaust holes is in communication with the accommodating cavity and the exhaust passage respectively.

[0010] In one of the embodiments of the first aspect, the second exhaust port comprises a plurality of second exhaust holes, the plurality of second exhaust holes are arranged along the second direction, and each of the second exhaust holes is in communication with the accommodating cavity and the exhaust passage respectively.

[0011] In one of the embodiments of the first aspect, the plastic part is provided with a first exhaust groove on one side along the second direction, and is provided with a second exhaust groove on the other side along the second direction, and the exhaust passage is in communication with the first exhaust groove and the second exhaust groove respectively along the second direction.

[0012] In one of the embodiments of the first aspect, the first exhaust groove and the second exhaust groove are both located on the first plastic part, and the first exhaust groove and the second exhaust groove are both arranged close to the cover plate along the third direction.

[0013] In one of the embodiments of the first aspect, the battery monomer also has a projection plane perpendicular to the first direction, the normal projection area of one side of the second plastic part along the first direction and the normal projection area of the other side of the second plastic part along the first direction on the projection plane are both S1, the normal projection area of the first exhaust port and the second exhaust port on the projection plane are both S2, and 0.4≤S2 / S1≤0.8 is met.

[0014] In one of the embodiments of the first aspect, the plastic part further comprises a third plastic part, the third plastic part is located in the exhaust passage and connected to the second plastic part, the third plastic part divides the part of the exhaust passage away from the cover plate along the third direction into a plurality of sub-passages, there is a gap between the third plastic part and the cover plate along the third direction, the gap is in communication with each of the sub-passages, the first exhaust port is in communication with at least one of the sub-passages, and the second exhaust port is in communication with at least one of the sub-passages.

[0015] In one of the embodiments of the first aspect, the third plastic part comprises a first plastic segment and a second plastic segment, and the first plastic segment and the second plastic segment are arranged intersectingly.

[0016] In one of the embodiments of the first aspect, a plurality of air holes are arranged on one side of the second plastic part away from the cover plate at the position of each of the sub-passages along the third direction, and each of the air holes is in communication with the accommodating cavity and the sub-passage respectively.

[0017] Secondly, embodiments of this application provide a battery comprising the battery cell described in any of the embodiments of the first aspect above.

[0018] The beneficial effects of this application are as follows:

[0019] The battery cell provided in this application has a first vent that communicates with the housing cavity on one side of the second plastic part along the first direction, and a second vent that communicates with the housing cavity on the other side of the second plastic part along the first direction. The venting channel communicates with the first vent and the second vent along the first direction, respectively. This makes the two sides of the plastic part along the first direction interconnected, which is more conducive to the dissipation of high temperature and high pressure gases, thereby improving the safety of the battery cell.

[0020] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] 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.

[0022] Figure 1 This paper shows a schematic diagram of the cover plate assembly from one perspective in one embodiment of the present application;

[0023] Figure 2 This paper shows a schematic diagram of the cover plate assembly from another perspective in one embodiment of the present application;

[0024] Figure 3 This illustration shows another perspective structural diagram of the cover plate assembly in one embodiment of the present application;

[0025] Figure 4 It shows Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0026] Figure 5 This illustration shows another perspective structural diagram of the cover plate assembly in one embodiment of the present application;

[0027] Figure 6 It shows Figure 5 Schematic diagram of the cross-sectional structure at point BB;

[0028] Figure 7 This illustration shows a schematic diagram of the structure of a plastic part from one perspective in one embodiment of this application;

[0029] Figure 8 Another perspective view of the plastic part in one embodiment of the present application is shown.

[0030] Main element symbol explanation:

[0031] 100 - cover plate assembly; 110 - cover plate; 120 - explosion-proof valve; 130 - plastic part; 131 - first plastic portion; 132 - second plastic portion; 133 - third plastic portion; 1331 - first plastic segment; 1332 - second plastic segment; 134 - exhaust passage; 1341 - sub-passage; 1342 - gap; 135 - first exhaust port; 1351 - first exhaust hole; 136 - second exhaust port; 1361 - second exhaust hole; 137 - first exhaust groove; 138 - second exhaust groove; 139 - vent hole; X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters throughout the figures denote the same or like elements or components. The embodiments described below are merely examples for explaining the present application and are not intended to limit the present application.

[0033] In the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] In addition, unless explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first feature and the second feature are in direct contact, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0035] In the description of the application, the terms "first", "second", etc. are used to distinguish different objects and cannot be understood as indicating or implying a specific order or primary and secondary relationship, or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0036] In the description of the application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0037] In the description of the application, the term "and / or" indicates that there can be three relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / ", in general, indicates that the associated objects before and after are in an "or" relationship.

[0038] In the description of the application, "parallel" not only includes the case of absolute parallel, but also includes the case of approximate parallel which is generally recognized in engineering; at the same time, "vertical" not only includes the case of absolute vertical, but also includes the case of approximate vertical which is generally recognized in engineering. Illustratively, the included angle between two directions is 80°-90°, which can be considered as vertical; the included angle between two directions is 0°-10°, which can be considered as parallel.

[0039] In a first aspect, embodiments of the application provide a battery monomer, relating to the technical field of battery, mainly applied in battery, for example, power battery, energy storage battery, etc., wherein the power battery is applied in electric device, and the energy storage battery is applied in energy storage device.

[0040] It should be noted that the electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, a new energy automobile, etc. The new energy automobile can be a pure electric automobile, a hybrid electric automobile and a range extended automobile, etc. The spacecraft can be an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool can be a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, etc. For example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The type of the electric device is not specifically limited here. In addition, the energy storage device can be an energy storage power station and an energy storage container, etc. The type of the energy storage device is not specifically limited here.

[0041] As shown in Figures 1 to 4 The battery cell provided by the embodiment has a first direction X, a second direction Y and a third direction Z perpendicular to each other, and includes a shell and a cover plate assembly 100.

[0042] The shell has a receiving cavity and an opening in communication, the cover plate assembly 100 includes a cover plate 110, an explosion-proof valve 120 and a plastic part 130, the cover plate 110 is connected to the shell to cover the opening, the plastic part 130 is located in the receiving cavity and includes a first plastic part 131 and a second plastic part 132, the first plastic part 131 is connected to the cover plate 110, the second plastic part 132 is connected to a side of the first plastic part 131 away from the cover plate 110 along the third direction Z, the first plastic part 131, the second plastic part 132 and the cover plate 110 form an exhaust passage 134, the exhaust passage 134 is in communication with the receiving cavity along the third direction Z, the explosion-proof valve 120 is connected to the cover plate 110 and is arranged corresponding to the exhaust passage 134, a side of the second plastic part 132 along the first direction X is provided with a first exhaust port 135 in communication with the receiving cavity, another side of the second plastic part 132 along the first direction X is provided with a second exhaust port 136 in communication with the receiving cavity, and the exhaust passage 134 is in communication with the first exhaust port 135 and the second exhaust port 136 along the first direction X, respectively.

[0043] It can be understood that the battery cell provided by the embodiment is provided with the plastic part 130 of the cover plate assembly 100, the second plastic part 132 is provided with the first exhaust port 135 communicated with the accommodating cavity of the shell on one side along the first direction X, the second plastic part 132 is provided with the second exhaust port 136 communicated with the accommodating cavity of the shell on the other side along the first direction X, and the exhaust passage 134 is communicated with the first exhaust port 135 and the second exhaust port 136 along the first direction X respectively, so that the two side regions of the plastic part 130 along the first direction X are communicated with each other, which is more conducive to the dispersion of high-temperature and high-pressure gas, thereby improving the safety of the battery cell.

[0044] It should be noted that the accommodating cavity of the shell is used to accommodate electrolyte and an electrode assembly, the electrode assembly includes a plurality of battery cells arranged, the electrolyte is used to soak the electrode assembly, and the electrode assembly is electrically connected with the pole column arranged on the cover plate 110, so as to facilitate the charging and discharging of the battery cell. The explosion-proof valve 120 is used to open the valve when the pressure in the accommodating cavity reaches a threshold value, so as to discharge the high-temperature and high-pressure gas. Specifically, the high-temperature and high-pressure gas has at least two dispersion paths: one is from the accommodating cavity to the explosion-proof valve 120 through the exhaust passage 134 along the third direction Z; and the other is from the accommodating cavity to the explosion-proof valve 120 through the exhaust passage 134 after entering the exhaust passage 134 from the first exhaust port 135 and the second exhaust port 136 along the first direction X.

[0045] As shown in Figure 3 , Figure 4 , Figure 7 and Figure 8 , in one embodiment, the first exhaust port 135 includes a plurality of first exhaust holes 1351, and the plurality of first exhaust holes 1351 are arranged at intervals along the second direction Y, and each first exhaust hole 1351 is respectively communicated with the accommodating cavity and the exhaust passage 134; and / or, the second exhaust port 136 includes a plurality of second exhaust holes 1361, and the plurality of second exhaust holes 1361 are arranged at intervals along the second direction Y, and each second exhaust hole 1361 is respectively communicated with the accommodating cavity and the exhaust passage 134.

[0046] As shown in Figure 3 , Figure 4 and Figure 8 , in one specific embodiment, the first exhaust port 135 includes a plurality of first exhaust holes 1351, and the plurality of first exhaust holes 1351 are arranged at intervals along the second direction Y, and each first exhaust hole 1351 is respectively communicated with the accommodating cavity and the exhaust passage 134.

[0047] Exemplarily, the number of the first exhaust holes 1351 can be two, three, four, etc., which is not specifically limited here.

[0048] It can be understood that by being provided with a plurality of first exhaust holes 1351 spaced apart along the second direction Y, the efficiency of the high-temperature and high-pressure gas from the second plastic part 132 into the exhaust passage 134 through the first exhaust port 135 on one side of the first direction X can be improved.

[0049] As shown in Figure 3 , Figure 4 and Figure 7 , in another specific embodiment, the second exhaust port 136 includes a plurality of second exhaust holes 1361, and the plurality of second exhaust holes 1361 are spaced apart along the second direction Y, and each of the second exhaust holes 1361 is in communication with the accommodation cavity and the exhaust passage 134, respectively.

[0050] Exemplarily, the number of the second exhaust holes 1361 can be two, three, four, etc., which is not specifically limited here.

[0051] It can be understood that by being provided with a plurality of second exhaust holes 1361 spaced apart along the second direction Y, the efficiency of the high-temperature and high-pressure gas from the second plastic part 132 into the exhaust passage 134 through the second exhaust port 136 on the other side of the first direction X can be improved.

[0052] As shown in Figures 2 to 5 , in one embodiment, the plastic part 130 is provided with a first exhaust groove 137 on one side of the second direction Y, and the plastic part 130 is provided with a second exhaust groove 138 on the other side of the second direction Y, and the exhaust passage 134 is in communication with the first exhaust groove 137 and the second exhaust groove 138 along the second direction Y, respectively. In this way, the two side regions of the plastic part 130 along the second direction Y are connected to each other, which is more conducive to the dispersion of high-temperature and high-pressure gas, thereby further improving the safety of the battery monomer.

[0053] It can be understood that, on the basis of being provided with the first exhaust port 135 and the second exhaust port 136, and after adding the first exhaust groove 137 and the second exhaust groove 138, the high-temperature and high-pressure gas in the accommodation cavity of the shell has at least three dispersion paths: one, from the accommodation cavity to the explosion-proof valve 120 through the exhaust passage 134 along the third direction Z; two, from the accommodation cavity to the exhaust passage 134 through the first exhaust port 135 and the second exhaust port 136 along the first direction X first, and then through the exhaust passage 134 to the explosion-proof valve 120; three, from the accommodation cavity to the exhaust passage 134 through the first exhaust groove 137 and the second exhaust groove 138 along the second direction Y first, and then through the exhaust passage 134 to the explosion-proof valve 120.

[0054] As shown in Figure 2 and Figure 5As shown, the first exhaust groove 137 and the second exhaust groove 138 are both located on the first plastic part 131, and the first exhaust groove 137 and the second exhaust groove 138 are both arranged close to the cover plate 110 along the third direction Z. Of course, the first exhaust groove 137 and the second exhaust groove 138 can also be located on the second plastic part 132, which can also make the two side areas of the plastic part 130 along the second direction Y communicate with each other, and the arrangement position of the first exhaust groove 137 and the second exhaust groove 138 is not specifically limited here.

[0055] In one embodiment, the battery cell also has a projection plane perpendicular to the first direction X, the normal projection area of the side of the second plastic part 132 along the first direction X and the other side of the second plastic part 132 along the first direction X on the projection plane is S1, and the normal projection area of the first exhaust port 135 and the second exhaust port 136 on the projection plane is S2, which satisfies: 0.4≤S2 / S1≤0.8.

[0056] Exemplarily, S2 / S1 can be selected as any value in 0.4, 0.42, 0.45, 0.5, 0.52, 0.55, 0.56, 0.58, 0.6, 0.61, 0.65, 0.7, 0.74, 0.79, 0.8 or any range formed by any two of them, which is not specifically limited here.

[0057] It should be noted that if S2 / S1 is too small, the flow efficiency of high-temperature and high-pressure gas will be reduced, which is not conducive to the dispersion of high-temperature and high-pressure gas. If S2 / S1 is too large, the structural stability and structural strength of the second plastic part 132 will be insufficient, which will cause the service life of the plastic part 130 to decrease.

[0058] It can be understood that by controlling S2 / S1 in the range of 0.4-0.8, that is, the area of the first exhaust port 135 accounts for 40%-80% of the area of the side of the second plastic part 132 along the first direction X, and the area of the second exhaust port 136 accounts for 40%-80% of the area of the other side of the second plastic part 132 along the first direction X, which not only facilitates the dispersion of high-temperature and high-pressure gas, but also improves the situation that the service life of the plastic part 130 is reduced due to insufficient structural stability and structural strength.

[0059] It should be noted that when the first exhaust port 135 includes a plurality of first exhaust holes 1351 arranged at intervals, S2 refers to the sum of the normal projection areas of the plurality of first exhaust holes 1351 on the projection plane; when the second exhaust port 136 includes a plurality of second exhaust holes 1361 arranged at intervals, S2 refers to the sum of the normal projection areas of the plurality of second exhaust holes 1361 on the projection plane.

[0060] As Figures 3 to 7As shown, in one embodiment, the plastic part 130 further comprises a third plastic portion 133, which is located in the exhaust passage 134 and connected to the second plastic portion 132. The third plastic portion 133 divides the part of the exhaust passage 134 away from the cover plate 110 along the third direction Z into a plurality of sub-passages 1341. There is a gap 1342 between the third plastic portion 133 and the cover plate 110 along the third direction Z, which communicates with each of the sub-passages 1341. The first exhaust port 135 communicates with at least one of the sub-passages 1341, and the second exhaust port 136 communicates with at least one of the sub-passages 1341.

[0061] It can be understood that the part of the exhaust passage 134 close to the cover plate 110 along the third direction Z is the gap 1342, and the part of the exhaust passage 134 away from the cover plate 110 along the third direction Z is divided into a plurality of sub-passages 1341 by the third plastic portion 133. By arranging the plurality of sub-passages 1341, the high-temperature and high-pressure gas can be more orderly dispersed, so as to improve the exhaust efficiency of the high-temperature and high-pressure gas. By arranging the gap 1342, the arrangement of the third plastic portion 133 will not affect the communication between the first exhaust port 135 and the second exhaust port 136. In addition, since the third plastic portion 133 is connected to the second plastic portion 132, the structure of the second plastic portion 132 can be strengthened, thereby improving the structural stability and structural strength of the plastic part 130.

[0062] As shown in Figure 4 , Figure 7 and Figure 8 , further, the third plastic portion 133 comprises a first plastic segment 1331 and a second plastic segment 1332, which are arranged intersecting each other. In this way, the part of the exhaust passage 134 away from the cover plate 110 along the third direction Z can be divided into four sub-passages 1341. At the same time, the intersecting arrangement of the two allows them to support each other, so as to better strengthen the structure of the second plastic portion 132.

[0063] Of course, for the above embodiment, the third plastic portion 133 can also comprise a plurality of plastic segments, which are arranged spaced apart along the first direction X or the second direction Y, i.e. the adjacent two plastic segments are parallel to each other without intersecting each other. The number of plastic segments can be two, three, four, five, etc., and the structure of the third plastic portion 133 is not specifically limited here.

[0064] As shown in Figure 2 , Figure 7 and Figure 8As shown, further, the second plastic part 132 is provided with a plurality of air holes 139 at the position of each sub-channel 1341 away from one side of the cover plate 110 along the third direction Z, each of the air holes 139 respectively communicates with the containing cavity and the sub-channel 1341. In this way, the exhaust channel 134 is indirectly communicated with the containing cavity through the air holes 139 along the third direction Z.

[0065] Of course, for the above-mentioned embodiments, the exhaust channel 134 can also be directly communicated with the containing cavity along the third direction Z, i.e. without the aid of any intermediate medium, and the way of communication between the exhaust channel 134 and the containing cavity along the third direction Z is not specifically limited herein.

[0066] In a second aspect, the embodiments of the present application provide a battery, comprising a plurality of battery cells as in any of the embodiments of the first aspect above, and the battery can be a power battery or an energy storage battery.

[0067] It can be understood that, since the battery provided by the embodiments has the battery cell as in any of the embodiments of the first aspect above, it has all the beneficial effects of the battery cell, which will not be described herein.

[0068] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means 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 application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0069] Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A battery cell, characterized by, The battery monomer has a first direction, a second direction and a third direction perpendicular to each other, and comprises: A shell having a receiving cavity and an opening in communication; A cover plate assembly comprising a cover plate, an explosion-proof valve and a plastic part, the cover plate is connected to the shell to cover the opening, the plastic part is located in the receiving cavity and comprises a first plastic part and a second plastic part, the first plastic part is connected to the cover plate, the second plastic part is connected to the side of the first plastic part away from the cover plate along the third direction, the first plastic part, the second plastic part and the cover plate form an exhaust passage, the exhaust passage is in communication with the receiving cavity along the third direction, the explosion-proof valve is connected to the cover plate and is arranged corresponding to the exhaust passage, the second plastic part is provided with a first exhaust port in communication with the receiving cavity along one side of the first direction, and the second plastic part is provided with a second exhaust port in communication with the receiving cavity along the other side of the first direction, and the exhaust passage is in communication with the first exhaust port and the second exhaust port along the first direction respectively.

2. The battery cell of claim 1, wherein, The first exhaust port comprises a plurality of first exhaust holes, and a plurality of the first exhaust holes are arranged at intervals along the second direction, and each of the first exhaust holes is in communication with the receiving cavity and the exhaust passage respectively.

3. The battery cell of claim 1, wherein, The second exhaust port comprises a plurality of second exhaust holes, and a plurality of the second exhaust holes are arranged at intervals along the second direction, and each of the second exhaust holes is in communication with the receiving cavity and the exhaust passage respectively.

4. The battery cell of claim 1, wherein, The plastic part is provided with a first exhaust groove along one side of the second direction, and the plastic part is provided with a second exhaust groove along the other side of the second direction, and the exhaust passage is in communication with the first exhaust groove and the second exhaust groove along the second direction respectively.

5. The battery cell of claim 4, wherein, The first exhaust groove and the second exhaust groove are both located on the first plastic part, and the first exhaust groove and the second exhaust groove are both arranged close to the cover plate along the third direction.

6. The battery cell of any one of claims 1 to 5, wherein, The battery monomer also has a projection plane perpendicular to the first direction, the normal projection area of the side of the second plastic part along the first direction and the normal projection area of the other side of the second plastic part along the first direction on the projection plane are both S1, the normal projection area of the first exhaust port and the second exhaust port on the projection plane are both S2, and 0.4≤S2 / S1≤0.8 is met.

7. The battery cell of any one of claims 1 to 5, wherein, The plastic part further comprises a third plastic part, the third plastic part is located in the exhaust passage and connected to the second plastic part, the third plastic part separates the part of the exhaust passage away from the cover plate along the third direction into a plurality of sub-passages, the third plastic part and the cover plate have a gap along the third direction, the gap is in communication with each of the sub-passages, the first exhaust port is in communication with at least one of the sub-passages, and the second exhaust port is in communication with at least one of the sub-passages.

8. The battery cell of claim 7, wherein, The third plastic part comprises a first plastic segment and a second plastic segment, and the first plastic segment and the second plastic segment are arranged intersectingly.

9. The battery cell of claim 7, wherein, A plurality of air holes are arranged at the position of each sub-channel of the second plastic part away from the side of the cover plate along the third direction, and each air hole is in communication with the accommodating cavity and the sub-channel respectively.

10. A battery, characterized by A plurality of battery cells as claimed in any one of claims 1 to 9.

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