Single battery and battery pack

Abstract

The utility model provides a single battery and a battery pack, and belongs to the technical field of batteries. The single battery has a first direction and comprises a shell, a first end cover, an electrode assembly and a bracket; an accommodating cavity is defined by the shell; the first end cover is connected with the shell in the first direction to cover the containing cavity, and the first end cover is provided with an anti-explosion valve. The electrode assembly is accommodated in the accommodating cavity; the support is contained in the containing cavity, located between the electrode assembly and the first end cover in the first direction and connected with the electrode assembly, an anti-explosion hole is formed in the support in the first direction in a penetrating mode, the anti-explosion valve is located in the projection range of the hole wall of the anti-explosion hole on the first end cover in the first direction, and an exhaust groove is formed in the side, away from the electrode assembly, of the support. And the exhaust groove is communicated with the explosion-proof hole. According to the single battery provided by the invention, the exhaust groove is formed in one side, deviating from the electrode assembly, of the bracket, so that the smoothness and the stability of exhaust can be ensured, and the compressive strength of the bracket can also be ensured.

Description

TECHNICAL FIELD

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

[0002] In the field of power battery, how to ensure the manufacturability and safety reliability of the battery is the most important for the battery manufacturing enterprise, and the reliability of the valve relief of the battery is particularly crucial. In the industry, the explosion-proof valve is often designed on the end cover of the pole column side for square electrode assembly or short knife electrode assembly structure.

[0003] The exhaust of the single battery is not smooth, which is easy to cause blockage and lead to local high air pressure, affecting the exhaust effect. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art and provide a single battery and a battery pack.

[0005] In a first aspect, the present application provides a single battery having a first direction, comprising:

[0006] a housing defining a receiving cavity;

[0007] a first end cover connected to the housing along the first direction to seal the receiving cavity, the first end cover being provided with an explosion-proof valve;

[0008] an electrode assembly accommodated in the receiving cavity;

[0009] a support accommodated in the receiving cavity, the support being located between the electrode assembly and the first end cover along the first direction, the support being connected to the electrode assembly, the support being provided with an explosion-proof hole along the first direction, along the first direction, the explosion-proof valve being located within the projection range of the hole wall of the explosion-proof hole on the first end cover, the side of the support away from the electrode assembly being provided with an exhaust groove, the exhaust groove being in communication with the explosion-proof hole.

[0010] In some embodiments, the single battery further has a second direction and a third direction intersecting with the first direction two by two, and the support comprises a plurality of support portions and a plurality of connecting portions;

[0011] The plurality of support portions are arranged at intervals along the second direction, and the plurality of connecting portions are arranged at intervals along the third direction, the connecting portions connecting two adjacent support portions along the second direction, and the plurality of connecting portions and the plurality of support portions defining the explosion-proof hole;

[0012] The support portion and / or the connecting portion is / are provided with the exhaust groove.

[0013] In some embodiments, the support portion is provided with the exhaust groove, which is a first exhaust groove, and the first exhaust groove penetrates the surface of the support portion along the second direction.

[0014] In some embodiments, the first exhaust groove is provided in a plurality of numbers, and the plurality of first exhaust grooves are arranged at intervals along the third direction.

[0015] In some embodiments, the connecting portion is provided with the exhaust groove, which is a second exhaust groove, and the second exhaust groove penetrates the surface of the connecting portion along the third direction.

[0016] In some embodiments, the second exhaust groove is provided in a plurality of numbers, and the plurality of second exhaust grooves are arranged at intervals along the second direction.

[0017] In some embodiments, the support portion is provided with a plurality of exhaust holes, and the exhaust holes penetrate the support portion along the first direction.

[0018] In some embodiments, the bracket is provided with a third exhaust groove on the side facing the first end cover, the exhaust holes are arranged on the groove wall of the third exhaust groove, and the exhaust holes are in communication with the third exhaust groove.

[0019] In some embodiments, the bracket is provided with the exhaust groove on the side close to the electrode assembly, and the exhaust groove is in communication with the explosion-proof hole.

[0020] In a second aspect, the application provides a battery pack, comprising: a box body and the monomer battery.

[0021] Embodiments of the application have the following advantages: by providing the exhaust groove on the side of the bracket away from the electrode assembly, the exhaust groove is in communication with the explosion-proof hole, so that the gas generated inside the electrode assembly is discharged into the explosion-proof hole through the exhaust groove, and the exhaust groove is not blocked, thereby effectively ensuring the smoothness and stability of the exhaust. In addition, the end of the exhaust groove away from the explosion-proof hole can be in communication with the first airflow channel, so that the gas generated in the first airflow channel by the electrode assembly is introduced into the explosion-proof hole through the exhaust groove, not only forming a support structure between the first end cover and the electrode assembly, but also ensuring the uniformity of the air pressure in each area in the accommodation cavity, thereby preventing the local air pressure from being too high to cause the local bulging of the monomer battery, and improving the smoothness and stability of the exhaust.

[0022] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without creative labor.

[0024] Figure 1 An exploded view of a single battery is shown according to some embodiments of the present application;

[0025] Figure 2 A structural schematic diagram of a bracket in a single battery is shown according to some embodiments of the present application;

[0026] Figure 3 A structural schematic diagram of a bracket in a single battery is shown according to some embodiments of the present application;

[0027] Figure 4 A structural schematic diagram of a bracket in a single battery is shown according to some embodiments of the present application;

[0028] Figure 5 A structural schematic diagram of a bracket in a single battery is shown according to some embodiments of the present application;

[0029] Figure 6 A structural schematic diagram of a bracket in a single battery is shown according to some embodiments of the present application;

[0030] Figure 7 A structural schematic diagram of a first end cover in a single battery is shown according to some embodiments of the present application;

[0031] Figure 8 A cross-sectional view of a single battery is shown according to some embodiments of the present application;

[0032] Figure 9 An enlarged view of part A in Figure 9 is shown;

[0033] Figure 10 An enlarged view of part B in Figure 9 is shown.

[0034] Main element symbol explanation:

[0035] 10 - monomer cell; 100 - shell; 110 - containing cavity; 120 - first end cover; 130 - second end cover; 140 - explosion-proof valve; 150 - pole; 200 - electrode assembly; 300 - first air flow channel; 400 - support; 410 - explosion-proof hole; 420 - exhaust groove; 421 - first exhaust groove; 430 - support part; 431 - exhaust hole; 432 - third exhaust groove; 433 - notch; 440 - connecting part; 422 - second exhaust groove; 500 - first flow guide channel; 600 - second flow guide channel.

[0036] X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0037] 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 features. The embodiments described below are exemplary, and are not intended to be limiting.

[0038] It is to be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. Like numbers refer to like elements throughout the description. The terms "vertical", "horizontal", "left", "right", and the like as used herein are made only for purposes of illustration, and do not connote or imply direction or order.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be internal connection of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance 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 present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is used only for the purpose of describing particular embodiments and is not intended to be limiting of this application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0042] At present, many enterprises choose a structure of separating heat and electricity, that is, by not designing the explosion-proof valve and the pole on the same side. If the heat and electricity separation scheme is adopted, the key to its reliability is how to make the gas smoothly discharge to the explosion-proof valve, and in the design of preventing blockage, there cannot be too much space redundancy on the explosion-proof valve side, otherwise the capacity of the battery will be affected. However, nowadays the capacity of the battery is getting larger and larger, and the weight of the large battery is also increasing synchronously, so the reliability of the exhaust support is gradually becoming difficult, especially the exhaust passage is easy to be blocked after being pressed by the large weight pole core.

[0043] Based on this, as shown in the drawings, Figures 1 to 3 Some embodiments of the present application provide a single battery to ensure the stability and smoothness of the exhaust, the single battery 10 has a first direction X.

[0044] The single battery 10 includes a shell 100, a first end cover 120, an electrode assembly 200, and a support 400.

[0045] The shell 100 defines a receiving cavity 110 with an opening, that is, the electrode assembly 200 can be installed into the receiving cavity 110 through the opening.

[0046] The first end cover 120 is connected with the shell 100 along the first direction X, and is covered on the receiving cavity 110 through the first end cover 120, so as to form a sealed receiving cavity 110 by the inner wall of the shell 100 and the side of the first end cover 120 facing the receiving cavity 110. It can be understood that the first end cover 120 is arranged at the opening and seals the opening. The connection between the first end cover 120 and the shell 100 at least includes one of snap connection, adhesion, threaded connection, bolt connection, hinged connection or one-piece forming.

[0047] The first end cover 120 is provided with an explosion-proof valve 140, which is arranged on the first end cover 120 to control the pressure inside the single battery 10 through the explosion-proof valve 140, so as to prevent the single battery 10 from exploding. When the pressure inside the single battery 10 is too high, the explosion-proof valve 140 will open under the action of the pressure, so as to release the high-pressure gas generated inside the single battery 10 to the external environment, thereby reducing the pressure inside the single battery 10, thereby effectively preventing the risk of explosion of the single battery 10.

[0048] The electrode assembly 200 is accommodated in the accommodating cavity 110. It can be understood that the electrode assembly 200 is mounted into the accommodating cavity 110 through the opening and is capped at the opening by the first end cover 120, so as to accommodate the electrode assembly 200 in the sealed accommodating cavity 110, so as to provide protection and fixation for the electrode assembly 200 by the shell 100 and the first end cover 120, and ensure the safety and stability of the electrode assembly 200 in the accommodating cavity 110.

[0049] The bracket 400 is accommodated in the accommodating cavity 110 and is located between the electrode assembly 200 and the first end cover 120 along the first direction X, wherein the thickness direction of the bracket 400 is parallel to the first direction X. It can be understood that the bracket 400 is arranged in layers between the first end cover 120 and the electrode assembly 200, so as to limit the bracket 400 by the side of the first end cover 120 facing the electrode assembly 200 and the side of the electrode assembly 200 facing the first end cover 120, so as to avoid the bracket 400 from moving or shaking in the first direction X in the accommodating cavity 110, thereby ensuring the stability of the bracket 400 between the first end cover 120 and the electrode assembly 200.

[0050] In the embodiment, the bracket 400 is connected with the electrode assembly 200, and the connection mode of the two includes at least one of lapping, clamping, and bonding, so as to further ensure the stability of the electrode assembly 200 in the accommodating cavity 110.

[0051] The bracket 400 is provided with the explosion-proof hole 410 penetrating along the first direction X. Since the bracket 400 is arranged between the electrode assembly 200 and the first end cover 120, the gas generated inside the electrode assembly 200 can flow to the side of the first end cover 120 facing the electrode assembly 200 through the explosion-proof hole 410, so as to provide a guiding effect for the gas generated inside the electrode assembly 200 through the explosion-proof hole 410, so that the gas can impact the corresponding area of the explosion-proof hole 410 on the first end cover 120 through the explosion-proof hole 410.

[0052] Along the first direction X, the explosion-proof valve 140 is located in the projection range of the hole wall of the explosion-proof hole 410 on the first end cover 120, so that the gas generated inside the electrode assembly 200 can impact the explosion-proof valve 140 arranged on the first end cover 120 through the explosion-proof hole 410. It can be understood that when the gas pressure in the accommodating cavity 110 is greater than the preset bearing gas pressure of the explosion-proof valve 140, the explosion-proof valve 140 is opened under the action of the gas pressure, so that the gas in the accommodating cavity 110 can be discharged through the explosion-proof valve 140, so as to reduce the pressure inside the single battery 10, thereby preventing the single battery 10 from exploding.

[0053] In addition, the single battery 10 also has a second direction Y intersecting the first direction X, along the second direction Y, the opposite sides of the support 400 are respectively spaced from the inner wall of the shell 100, and the two opposite sides of the electrode are respectively spaced from the inner wall of the shell 100, so as to form the first airflow channel 300 between the electrode assembly 200 and the shell 100.

[0054] Because the support 400 is connected with the Mylar film of the electrode assembly 200, the Mylar film will be hot and blocked when the electrode assembly 200 exhausts.

[0055] In the embodiment, the side of the support 400 away from the electrode assembly 200 is provided with an exhaust groove 420, the exhaust groove 420 is communicated with the explosion-proof hole 410, so as to exhaust the gas generated in the electrode assembly 200 into the explosion-proof hole 410 through the exhaust groove 420, so that the Mylar film will not be hot and blocked when the Mylar film is hot, thereby effectively ensuring the smoothness and stability of the exhaust. In addition, the end of the exhaust groove 420 away from the explosion-proof hole 410 can be communicated with the first airflow channel 300, so as to guide the gas generated in the electrode assembly 200 in the first airflow channel 300 into the explosion-proof hole 410 through the exhaust groove 420, not only forming a support structure between the first end cover 120 and the electrode assembly 200, but also ensuring the uniformity of the gas pressure in each area in the containing cavity 110, thereby preventing the local gas pressure from being too high to cause the single battery 10 to be locally bulged, and improving the smoothness and stability of the exhaust.

[0056] As shown in FIG. Figures 1 to 3 In some embodiments, the single battery 10 also has a second direction Y and a third direction Z intersecting the first direction X, the support 400 includes a plurality of support portions 430 and a plurality of connecting portions 440, and it can be understood that the number of the support portions 430 and the connecting portions 440 can be two or any number of two or more, which can be set according to actual conditions.

[0057] Among them, the plurality of support portions 430 are arranged at intervals along the second direction Y, the plurality of connecting portions 440 are arranged at intervals along the third direction Z, and the connecting portions 440 connect the two adjacent support portions 430 along the second direction Y, and the plurality of connecting portions 440 and the plurality of support portions 430 define the explosion-proof hole 410.

[0058] In some embodiments, the plurality of connecting portions 440 and the plurality of support portions 430 are respectively centrally symmetric with the midpoint of the support 400, so as to improve the uniformity of the support force of the support 400 between the first end cover 120 and the electrode assembly 200.

[0059] In the embodiment, the support portion 430 and the connecting portion 440 are two, and the two support portions 430 and the two connecting portions 440 are connected to define the support 400 with the explosion-proof hole 410.

[0060] Additionally, the support portion 430 and / or the connecting portion 440 are provided with exhaust grooves 420. It is understood that in some embodiments, the support portion 430 or the connecting portion 440 is provided with exhaust grooves 420. It is understood that providing exhaust grooves 420 on the support portion 430 or the connecting portion 440 allows gas in the first airflow channel 300 to be guided into the explosion-proof hole 410. Reducing the number of exhaust grooves 420 not only increases the overall strength of the bracket 400 and prevents blockage in the exhaust grooves 420, but also ensures the smoothness and stability of exhaust.

[0061] In other embodiments, both the support portion 430 and the connecting portion 440 are provided with exhaust grooves 420. It is understood that by increasing the number of exhaust grooves 420, not only can the efficiency of the bracket 400 in guiding the gas in the first airflow channel 300 be improved, but the blockage of the exhaust grooves 420 can also be effectively prevented, thereby ensuring the smoothness and stability of exhaust.

[0062] like Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments, the support portion 430 is provided with an exhaust groove 420, which is a first exhaust groove 421. The first exhaust groove 421 penetrates the surface of the support portion 430 along the second direction Y.

[0063] It is understood that the end of the first exhaust groove 421 facing away from the explosion-proof hole 410 is connected to the first airflow channel 300, and the end of the first exhaust groove 421 facing the explosion-proof hole 410 is connected to the explosion-proof hole 410, so as to provide a guiding effect for the gas in the first airflow channel 300 through the first exhaust groove 421.

[0064] In some embodiments, the first venting groove 421 is disposed on the side of the support portion 430 facing the first end cap 120. In other embodiments, the first venting groove 421 is disposed on the side of the support portion 430 facing the electrode assembly 200.

[0065] like Figure 3 and Figure 6 As shown, in some embodiments of this application, along the first direction X, first exhaust grooves 421 are provided on both back sides of the support portion 430. That is, the first exhaust grooves 421 are alternately staggered on both back sides of the support portion 430, which not only improves the gas guiding efficiency of the first exhaust grooves 421, but also ensures the overall strength of the support portion 430. In addition, by setting the staggered arrangement of the first exhaust grooves 421, it is possible to effectively prevent the support portion 430 from being blocked after being squeezed by the electrode assembly 200, thereby effectively ensuring the smoothness and stability of the first exhaust grooves 421 in guiding the gas in the first airflow channel 300 to the explosion-proof hole 410.

[0066] As shown in Figure 3 and Figure 6 In some embodiments, the number of the first exhaust grooves 421 is multiple, and the multiple first exhaust grooves 421 are arranged in the third direction Z. By arranging multiple first exhaust grooves 421, the gas guiding efficiency of the gas generated by the electrode assembly 200 can be improved.

[0067] For example, in some embodiments, the multiple first exhaust grooves 421 are arranged on the side of the support portion 430 facing the first end cover 120; in other embodiments, the multiple first exhaust grooves 421 are arranged on the side of the support portion 430 away from the first end cover 120.

[0068] As shown in Figure 6 , Figure 8 and Figure 9 In some embodiments of the present application, the side of the support portion 430 facing the first end cover 120 and the side of the support portion 430 away from the first end cover 120 are both provided with multiple first exhaust grooves 421, and the multiple first exhaust grooves 421 are arranged in the third direction Z in a staggered manner. It can be understood that in the present embodiment, the multiple first exhaust grooves 421 form a continuous concave-convex structure on the support portion 430 in the first direction X, which not only ensures the support strength of the support portion 430, but also improves the efficiency, smoothness and stability of the support portion 430 in guiding the gas generated by the electrode assembly 200 to the explosion-proof hole 410.

[0069] In the second direction Y, the ratio of the length of the bracket 400 to the length of the first end cover 120 is m, where the value of m is in the range of 0.9≤m<1. It can be understood that in the second direction Y, the length of the bracket 400 is less than the length of the first end cover 120, so as to form a first guiding channel 500 by the side of the bracket 400 in the second direction Y, the side of the first end cover 120 facing the electrode assembly 200, the side of the electrode assembly 200 facing the bracket 400 and the inner wall of the shell 100. One end of the first guiding channel 500 communicates with the first airflow channel 300, and the other end of the first guiding channel 500 communicates with the first exhaust groove 421, so that the gas in the first airflow channel 300 can enter the first exhaust groove 421 through the first guiding channel 500, and be guided to the explosion-proof hole 410 through the first exhaust groove 421.

[0070] Since the support 400 plays a role of supporting and guiding flow between the first end cover 120 and the electrode assembly 200, if the length of the support 400 is equal to the length of the first end cover 120, the gas in the first airflow channel 300 will be affected to enter the first exhaust groove 421, affecting the exhaust efficiency, and if the length of the support 400 is too small, the stress between the support 400, the first end cover 120 and the electrode assembly 200 will be uneven, not only affecting the supporting strength, but also easily causing the first end cover 120 or the electrode assembly 200 to deform towards one end of the first end cover 120.

[0071] Based on this, the ratio between the length of the support 400 and the length of the first end cover 120 is controlled to be between 0.9 and 1, which not only ensures the overall strength of the support 400 and the uniformity of the bearing force between the first end cover 120 and the electrode assembly 200, but also ensures that the gas in the first airflow channel 300 can enter the first exhaust groove 421 through the first flow guide channel 500, thereby ensuring the smoothness and stability of the exhaust.

[0072] As shown in Figure 4 , Figure 8 and Figure 10 , in some embodiments, the connecting portion 440 is provided with an exhaust groove 420, which is a second exhaust groove 422, and the second exhaust groove 422 penetrates the surface of the connecting portion 440 along the third direction Z.

[0073] It can be understood that one end of the second exhaust groove 422 away from the explosion-proof hole 410 is in communication with the first airflow channel 300, and one end of the second exhaust groove 422 towards the explosion-proof hole 410 is in communication with the explosion-proof hole 410, so as to provide a flow guiding effect on the gas in the first airflow channel 300 through the second exhaust groove 422.

[0074] It should be noted that the ratio between the width of the support 400 and the width of the first end cover 120 is n, wherein the value of n is in the range of 0.8≤n<1. It can be understood that along the third direction Z, the width of the support 400 is smaller than the width of the first end cover 120, so as to form a second flow guide channel 600 by the side surface of the support 400 in the third direction Z, the side of the first end cover 120 towards the electrode assembly 200, the side of the electrode assembly 200 towards the support 400 and the inner wall of the shell 100. One end of the second flow guide channel 600 along the second direction Y is in communication with the first airflow channel 300, and one end of the second flow guide channel 600 towards the explosion-proof hole 410 is in communication with the second exhaust groove 422, so that the gas in the first airflow channel 300 can enter the second exhaust groove 422 through the second flow guide channel 600, and be guided to the explosion-proof hole 410 through the second exhaust groove 422.

[0075] Since the support 400 plays a role of supporting and guiding flow between the first end cover 120 and the electrode assembly 200, if the width of the support 400 is equal to the width of the first end cover 120, the gas in the first airflow channel 300 cannot enter the second exhaust groove 422, and if the width of the support 400 is too small, the stress between the first end cover 120 and the electrode assembly 200 is uneven, which not only affects the supporting strength, but also easily causes the first end cover 120 or the electrode assembly 200 to deform towards one end of the first end cover 120.

[0076] Based on this, the ratio between the width of the support 400 and the width of the first end cover 120 is controlled to be between 0.8 and 1, which not only ensures the overall strength of the support 400 and the uniformity of the bearing force between the first end cover 120 and the electrode assembly 200, but also ensures that the gas in the first airflow channel 300 can enter the second exhaust groove 422 through the second flow guiding channel 600, thereby improving the exhaust efficiency.

[0077] In some embodiments, the second exhaust groove 422 is arranged on the side of the connecting portion 440 facing the first end cover 120. In other embodiments, the second exhaust groove 422 is arranged on the side of the connecting portion 440 facing away from the first end cover 120.

[0078] As shown in Figure 5 , Figure 8 and Figure 9 , in some embodiments of the present application, the second exhaust groove 422 is arranged on both sides of the connecting portion 440 in the first direction X, that is, the second exhaust groove 422 is arranged alternately staggered on both sides of the connecting portion 440, which not only improves the flow guiding efficiency of the second exhaust groove 422, but also ensures the overall strength of the connecting portion 440. In addition, by arranging the second exhaust groove 422 staggered, the connecting portion 440 can be effectively prevented from being blocked after being pressed by the electrode assembly 200, thereby effectively ensuring the efficiency of the second exhaust groove 422 guiding the gas in the first airflow channel 300 to the explosion-proof hole 410.

[0079] As shown in Figure 4 , in some embodiments, the number of second exhaust grooves 422 is multiple, and the multiple second exhaust grooves 422 are arranged in the second direction Y, and by arranging multiple second exhaust grooves 422, the flow guiding efficiency of the gas generated by the electrode assembly 200 is improved.

[0080] For example, in some embodiments, the multiple second exhaust grooves 422 are arranged on the side of the connecting portion 440 facing the first end cover 120; in other embodiments, the multiple second exhaust grooves 422 are arranged on the side of the connecting portion 440 facing away from the first end cover 120.

[0081] As Figures 1 to 4 shown in FIG. 1, in some embodiments of the present application, the connecting portion 440 is provided with a plurality of second exhaust grooves 422 on the side facing the first end cover 120 and the side facing away from the first end cover 120, and the plurality of second exhaust grooves 422 are staggered along the second direction Y. It can be understood that along the first direction X, the plurality of second exhaust grooves 422 form a continuous concave-convex structure on the connecting portion 440, which not only ensures the strength of the connecting portion 440, but also improves the exhaust efficiency.

[0082] Since increasing the number of exhaust grooves 420 on the frame body will weaken the compressive strength of the frame body, reducing the number of exhaust grooves 420 will affect the exhaust efficiency and the smoothness of the exhaust, and during use of the single battery 10, gas will be generated at the gap between the winding cores in the electrode assembly 200, and the gap between the winding cores is opposite to the frame body. Therefore, the gas generated at the gap of the winding core will flow in the direction of the frame body.

[0083] Based on this, as Figure 3 shown in FIG. 1, in some embodiments of the present application, the bracket 400 is provided with a third exhaust groove 432 on the side facing the first end cover 120, and the third exhaust groove 432 is provided with a notch 433 communicating with the explosion-proof hole 410 at one end adjacent to the explosion-proof hole 410.

[0084] In this embodiment, the third exhaust groove 432 is provided on the side of the supporting portion 430 facing the first end cover 120, and the third exhaust groove 432 is arranged in a spaced-apart manner with the first exhaust groove 421. In addition, the supporting portion 430 is provided with a plurality of exhaust holes 431 penetrating through the supporting portion 430 along the first direction X. It should be noted that the exhaust holes 431 are arranged on the groove wall of the third exhaust groove 432 and communicate with the third exhaust groove 432. The side of the bracket 400 facing the electrode assembly 200 is communicated with the third exhaust groove 432 through the exhaust holes 431, so that the gas generated at the gap between the winding cores in the electrode assembly 200 can enter the third exhaust groove 432 through the exhaust holes 431, and then enter the explosion-proof hole 410 through the notch 433 communicating with the explosion-proof hole 410, so as to further improve the exhaust efficiency, and effectively ensure the overall strength of the frame body, thereby ensuring the stability of the frame body.

[0085] As Figures 2 to 4 shown in FIG. 1, in some embodiments, the bracket 400 is provided with an exhaust groove 420 on the side close to the electrode assembly 200, and the exhaust groove 420 communicates with the explosion-proof hole 410.

[0086] In some embodiments, the support 400, such as the connecting portion 440, includes a protrusion and a recess. The protrusion protrudes along a first direction X towards the electrode assembly 200, and the recess is recessed along the first direction X away from the electrode assembly 200. The protrusion and recess are alternately distributed along a second direction Y. An exhaust groove 420 is formed between adjacent protrusions, with the opening of the exhaust groove 420 facing the electrode assembly 200. An exhaust groove 420 is formed between adjacent recesses, with the opening of the exhaust groove 420 away from the electrode assembly 200. When the electrode assembly 200 and the exhaust groove 420 with its opening facing the electrode assembly 200 are blocked by a heat-fused Mylar membrane, gas can still be discharged from the exhaust groove 420 with its opening away from the electrode assembly 200 to the explosion-proof valve 140.

[0087] It is understood that the protrusions and recesses provided on the support portion 430 are alternately distributed along the third direction Z to form a first vent groove 421 on the support portion 430; in addition, the protrusions and recesses provided on the connecting portion 440 are alternately distributed along the second direction Y to form a second vent groove 422 on the connecting portion 440.

[0088] like Figure 1 and Figure 7 As shown, in some embodiments of this application, the single cell 10 includes a second end cap 130. Along the first direction X, the first end cap 120 and the second end cap 130 are respectively disposed on two opposite sides of the housing 100, and the second end cap 130 is provided with a terminal post 150.

[0089] Along the first direction X, the second end cap 130 is connected to the housing 100 and seals the receiving cavity 110. The connection between the second end cap 130 and the housing 100 includes at least one of the following: snap-fit, adhesive, bolted connection, or integral connection.

[0090] In addition, some embodiments of this application also provide a battery pack, including a housing and a single battery cell 10 as described in any of the above embodiments.

[0091] In this embodiment, individual battery cells 10 can be housed in a casing to form a battery pack. Alternatively, multiple individual battery cells 10 can be grouped into a battery module, and then the battery module can be housed in a casing to form a battery pack.

[0092] It is understood that the battery pack has the beneficial effects of the single cell 10 in any of the above embodiments, which will not be described in detail here.

[0093] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0094] It should be noted that like numerals and letters refer to like items throughout the several views, and once an item is defined in one view, it should not require further defining and explaining in the subsequent views.

[0095] The above-described embodiments are merely illustrative for the several embodiments of the present application, and the description is relatively specific and detailed, but should not be understood as limiting the scope of the present application. It should be noted that for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A single cell having a first direction (X), characterized in that, The single battery (10) comprises: a shell (100) defining a containing cavity (110); a first end cover (120) connected to the shell (100) along the first direction (X) to cover the containing cavity (110), the first end cover (120) being provided with an explosion-proof valve (140); an electrode assembly (200) accommodated in the containing cavity (110); a bracket (400) accommodated in the containing cavity (110), the bracket (400) being located between the electrode assembly (200) and the first end cover (120) along the first direction (X), the bracket (400) being connected to the electrode assembly (200), the bracket (400) being provided with an explosion-proof hole (410) penetrating through the bracket (400) along the first direction (X), along the first direction (X), the explosion-proof valve (140) being located in the projection range of the hole wall of the explosion-proof hole (410) on the first end cover (120), and the bracket (400) being provided with an exhaust groove (420) on the side away from the electrode assembly (200), the exhaust groove (420) being in communication with the explosion-proof hole (410).

2. The cell according to claim 1, wherein The single battery (10) further has a second direction (Y) and a third direction (Z) intersecting with the first direction (X) two by two, and the bracket (400) comprises a plurality of support portions (430) and a plurality of connecting portions (440); a plurality of the support portions (430) are arranged at intervals along the second direction (Y), a plurality of the connecting portions (440) are arranged at intervals along the third direction (Z), the connecting portions (440) connect two adjacent support portions (430) along the second direction (Y), and a plurality of the connecting portions (440) and a plurality of the support portions (430) define the explosion-proof hole (410); the support portion (430) and / or the connecting portion (440) are provided with the exhaust groove (420).

3. The cell according to claim 2, wherein The support portion (430) is provided with the exhaust groove (420), and the exhaust groove (420) is a first exhaust groove (421) penetrating through the surface of the support portion (430) along the second direction (Y).

4. The cell according to claim 3, wherein The number of the first exhaust grooves (421) is a plurality, and a plurality of the first exhaust grooves (421) are arranged at intervals along the third direction (Z).

5. The cell according to claim 2, wherein The connecting portion (440) is provided with the exhaust groove (420), and the exhaust groove (420) is a second exhaust groove (422) penetrating through the surface of the connecting portion (440) along the third direction (Z).

6. The cell according to claim 5, wherein The number of the second exhaust grooves (422) is a plurality, and a plurality of the second exhaust grooves (422) are arranged at intervals along the second direction (Y).

7. The cell according to any one of claims 2 to 6, wherein, The support portion (430) is provided with a plurality of exhaust holes (431) penetrating through the support portion (430) along the first direction (X).

8. The cell according to claim 7, wherein The bracket (400) is provided with a third exhaust groove (432) on one side thereof facing the first end cover (120), and the exhaust hole (431) is arranged on the groove wall of the third exhaust groove (432) and communicates with the third exhaust groove (432).

9. The cell according to claim 1, wherein The bracket (400) is provided with the exhaust groove (420) on one side thereof close to the electrode assembly (200), and the exhaust groove (420) communicates with the explosion-proof hole (410).

10. A battery pack, characterized by, The application relates to a battery pack (1) comprising: a housing and a plurality of single cells (10) according to any one of claims 1 to 9.

Images