Battery cell

Abstract

The utility model discloses a battery monomer, which belongs to the technical field of batteries, and comprises a shell, a battery module, a battery module and a battery module, the inner core is arranged in the accommodating cavity; a first cover plate and a second cover plate are arranged on different sides of the shell, a pole is arranged on the first cover plate, and an anti-explosion valve is arranged on the second cover plate; the second cover plate comprises a main body part and a spacing part which are connected, and the main body part is connected to the shell. For the battery of which the explosion-proof valve and the pole are arranged on different sides, the explosion-proof valve is arranged on the second cover plate, and the second cover plate is provided with the spacing part protruding towards the direction of the inner core, so that when the battery is subjected to thermal runaway, the inner core can move towards the explosion-proof valve, and when the inner core moves for a certain distance, the inner core is blocked by the spacing part; therefore, the explosion-proof valve cannot be blocked, gas in the battery can be discharged through the explosion-proof valve, and normal pressure relief of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery monomer. BACKGROUND

[0002] The battery explosion-proof valve is a safety device for protecting the battery. Its function is to release pressure when the internal pressure of the battery is too high, preventing the battery from exploding or leaking. For the battery in which the explosion-proof valve and the pole are arranged on different sides, when thermal runaway occurs, the inner core of the battery may block the explosion-proof valve, affecting the normal pressure relief of the battery. CONTENT OF THE UTILITY MODEL

[0003] The application aims to overcome the technical problem that when the battery in which the explosion-proof valve and the pole are arranged on different sides occurs thermal runaway, the inner core may block the explosion-proof valve.

[0004] TECHNICAL SCHEME: The battery monomer provided by the embodiments of the application comprises:

[0005] The shell has a containing cavity;

[0006] The inner core is arranged in the containing cavity;

[0007] The first cover plate and the second cover plate are arranged on different sides of the shell, the pole is arranged on the first cover plate, and the explosion-proof valve is arranged on the second cover plate; the second cover plate comprises a main body portion and a spacing portion connected to each other, the main body portion is connected to the shell, and the spacing portion is arranged on one side of the main body portion facing the inner core and is used for spacing the inner core and the main body portion.

[0008] In some embodiments, the second cover plate comprises a plurality of spacing portions, and the plurality of spacing portions are arranged on two sides of the explosion-proof valve, respectively.

[0009] In some embodiments, the second cover plate is formed with a groove, and the groove is arranged on the side of the spacing portion away from the inner core.

[0010] In some embodiments, the first cover plate and the second cover plate are arranged on opposite sides of the shell, respectively.

[0011] In some embodiments, the battery monomer satisfies D≤7mm;

[0012] Wherein, D is the size of the spacing portion protruding from the main body portion along the thickness direction of the second cover plate.

[0013] In some embodiments, the battery monomer comprises:

[0014] The insulating member includes a first insulating portion disposed on a side of the second cover plate facing the inner core, the first insulating portion having a fitting groove, the spacer portion being located in the fitting groove, and the first insulating portion spacing the inner core and the spacer portion.

[0015] In some embodiments, the insulating member includes:

[0016] A reinforcing portion is located in the fitting groove and connected to the first insulating portion, the reinforcing portion extending along a length direction of the second cover plate and / or extending along a width direction of the second cover plate.

[0017] In some embodiments, the first insulating portion has a plurality of first through holes communicating the fitting groove and the accommodating cavity, the first through holes extending along a thickness direction of the second cover plate, and a projection of the spacer portion on the first insulating portion along the thickness direction of the second cover plate is located outside the first through holes.

[0018] In some embodiments, the first insulating portion has a plurality of second through holes communicating the fitting groove and the accommodating cavity, the second through holes being spaced apart along a width direction of the second cover plate, and at least part of the second through holes being disposed on one side of the first insulating portion along a length direction of the second cover plate.

[0019] The first insulating portion has a plurality of third through holes communicating the fitting groove and the accommodating cavity, each of the third through holes being disposed corresponding to one of the second through holes, and at least part of the third through holes being disposed on another side of the first insulating portion along the length direction.

[0020] In some embodiments, a side of the main body portion facing the inner core has a positioning groove; and the insulating member further includes:

[0021] A second insulating portion is located on a side of the second cover plate facing the inner core and connected to the first insulating portion.

[0022] A positioning portion is connected to a side of the second insulating portion facing the second cover plate and embedded in the positioning groove.

[0023] In some embodiments, the insulating member further includes a third insulating portion disposed on a side of the second insulating portion away from the first insulating portion, the third insulating portion having a connecting groove disposed facing the explosion-proof valve, a plurality of first flow holes and a plurality of second flow holes communicating with the connecting groove, the first flow holes being disposed through a bottom wall of the connecting groove along a thickness direction of the second cover plate, and at least part of the second flow holes being disposed through a side wall of the connecting groove along a length direction of the second cover plate.

[0024] Beneficial effects: the battery cell of the embodiment of the application comprises: a shell having a containing cavity; an inner core arranged in the containing cavity; a first cover plate and a second cover plate arranged on different sides of the shell, a pole is arranged on the first cover plate, and an explosion-proof valve is arranged on the second cover plate; the second cover plate comprises a main body part and a spacing part connected with each other, the main body part is connected to the shell, and the spacing part is arranged on one side of the main body part facing the inner core in a protruding manner and is used for spacing the inner core and the main body part. For the battery in which the explosion-proof valve and the pole are arranged on different sides, since the explosion-proof valve is arranged on the second cover plate, the spacing part protruding towards the direction of the inner core is arranged on the second cover plate, when the battery is in thermal runaway, the inner core may move towards the direction of the explosion-proof valve, and when the inner core moves a certain distance, the inner core is blocked by the spacing part, so that the explosion-proof valve is not blocked, which is beneficial to the gas in the battery being discharged through the explosion-proof valve and ensuring the normal pressure relief of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0026] Figure 1 The explosion structure schematic diagram of the battery cell provided by the embodiment of the application is shown in the figure.

[0027] Figure 2 The structure schematic diagram of the battery cell provided by the embodiment of the application is shown in the figure, wherein the first cover plate and the second cover plate are arranged opposite to each other.

[0028] Figure 3 The structure schematic diagram of the battery cell provided by the embodiment of the application is shown in the figure, wherein the first cover plate and the second cover plate are arranged adjacent to each other.

[0029] Figure 4 The reverse structure schematic diagram of the second cover plate provided by the embodiment of the application is shown in the figure.

[0030] Figure 5 The front structure schematic diagram of the second cover plate provided by the embodiment of the application is shown in the figure.

[0031] Figure 6 The front view of the second cover plate provided by the embodiment of the application is shown in the figure.

[0032] Figure 7 The front structure schematic diagram of the insulating piece provided by the embodiment of the application is shown in the figure.

[0033] Figure 8 The reverse structure schematic diagram of the insulating piece provided by the embodiment of the application is shown in the figure.

[0034] Figure 9A front view of a battery cell provided by an embodiment of the present application;

[0035] Figure 10 A front view of a battery cell provided by an embodiment of the present application Figure 9 A local enlarged view of region A in the middle;

[0036] Reference numerals: 10 - housing; 11 - accommodating cavity; 20 - inner core; 30 - first cover plate; 31 - pole column; 40 - second cover plate; 41 - explosion-proof valve; 42 - main body part; 421 - positioning groove; 43 - spacing part; 50 - insulating piece; 51 - first insulating part; 511 - fitting groove; 512 - first through hole; 513 - second through hole; 514 - third through hole; 52 - reinforcing part; 53 - second insulating part; 54 - positioning part; 55 - third insulating part; 551 - connecting groove; 552 - first overflow hole; 553 - second overflow hole; X - thickness direction; Y - length direction; Z - width direction. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely in the description of the embodiments of the present application in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0038] In the description of the present application, it should be understood that the terms “first”, “second” are used 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 features. In the description of the present application, the meaning of “multiple” is two or more, at least one of which can be one, two or more, unless otherwise specifically limited.

[0039] As an introduction of the embodiments of the present application, a battery monomer is introduced. For large capacity batteries, safety is particularly important, especially in the case of thermal runaway of the battery, a large amount of gas is generated rapidly in the battery. If the battery cannot be relieved in time, the battery may explode and other safety problems may occur. Therefore, the area of the explosion-proof valve on the large capacity battery is generally set to be larger in order to improve the exhaust efficiency. However, due to the large area of the explosion-proof valve, there is not much space on the side of the battery with the pole column to set the explosion-proof valve, so the explosion-proof valve and the pole column are often set on different sides. This setting method can also achieve thermal-electric separation to a certain extent. In the battery, the conventional design is to place the explosion-proof valve between the positive and negative pole columns. Due to the support of the plastic and tab, the explosion-proof valve has enough space with the inner core. In the case of thermal runaway, the inner core will not block the explosion-proof valve (when the battery is in thermal runaway, the gas generated in the battery may push the inner core to move towards the direction of the explosion-proof valve). However, for the setting method of the large area explosion-proof valve on the large capacity battery, the cover plate where the explosion-proof valve is located and the inner core are not separated by any structure. In the case of thermal runaway of the battery, the inner core may block the explosion-proof valve, causing the explosion-proof valve to fail to relieve pressure, and the gas in the battery cannot be discharged in time. With the continuous increase of the gas pressure in the battery, the battery may even explode and catch fire.

[0040] Therefore, the embodiments of the present application provide a battery monomer to overcome at least one of the above technical problems.

[0041] Please refer to Figure 1 , Figure 2 and Figure 3 In the embodiments of the present application, the battery monomer comprises a shell 10, an inner core 20, a first cover plate 30 and a second cover plate 40.

[0042] The shell 10 has a receiving cavity 11. The inner core 20 is arranged in the receiving cavity 11. The shell 10 is provided with the first cover plate 30 and the second cover plate 40 on different sides. The first cover plate 30 is provided with a pole column 31, and the second cover plate 40 is provided with an explosion-proof valve 41. The second cover plate 40 comprises a main body part 42 and a spacing part 43 connected with each other. The main body part 42 is connected to the shell 10, and the spacing part 43 is protrudingly arranged on the side of the main body part 42 facing the inner core 20, for spacing the inner core 20 and the main body part 42.

[0043] It can be understood that the accommodating cavity 11 of the shell 10 can provide a good working environment for the inner core 20 and other important structures in the battery, and the shell 10 can protect these structures from being damaged by external factors. For a large-capacity battery, the area of the explosion-proof valve 41 arranged thereon is large, so the explosion-proof valve 41 and the pole 31 are generally arranged on different sides of the battery. In this embodiment, the pole 31 is arranged on the first cover plate 30, and the explosion-proof valve 41 is arranged on the second cover plate 40. The second cover plate 40 is arranged on the different side of the first cover plate 30 in the shell 10, so that the explosion-proof valve 41 and the pole 31 can be arranged on different sides of the battery, which facilitates the arrangement of the explosion-proof valve 41 with a large area on the large-capacity battery, and also can preliminarily realize thermal-electric separation and reduce the influence of high-temperature gas discharged by the explosion-proof valve 41 on the pole 31 when the explosion-proof valve 41 is opened. The first cover plate 30 and the second cover plate 40 can be arranged on opposite sides of the battery, or can be arranged on adjacent sides of the battery, as shown in Figure 2 and Figure 3 .

[0044] When the battery in which the explosion-proof valve 41 and the pole 31 are arranged on different sides occurs thermal runaway, a large amount of gas may be generated inside the battery, which can push the inner core 20 to move towards the explosion-proof valve 41. Since the spacing part 43 is protrudingly arranged on the side of the main body part 42 facing the inner core 20, when the inner core 20 moves a certain distance, it will be blocked by the spacing part 43 and stop moving, so as not to contact the main body part 42, thereby avoiding blocking the explosion-proof valve 41 (the explosion-proof valve 41 is arranged on the main body part 42). The spacing part 43 can be made of a non-insulating material such as metal having a certain strength, or can be made of an insulating material such as rubber, ceramic, glass fiber having a certain strength; however, if the spacing part 43 is directly arranged in contact with the inner core 20, the spacing part 43 needs to be made of an insulating material to avoid the electrical connection between the second cover plate 40 and the inner core 20. The spacing part 43 separates the inner core 20 and the main body part 42, so that there is a flow passage between the inner core 20 and the main body part 42. When the battery occurs thermal runaway, the gas generated can impact the explosion-proof valve 41 through the flow passage, so that the explosion-proof valve 41 is opened, and the gas can be discharged in time through the explosion-proof valve 41, thereby ensuring the normal pressure relief of the battery.

[0045] Please refer to Figure 1 , Figure 4 and Figure 5In some embodiments, the second cover plate 40 includes a plurality of spacing portions 43, which are respectively arranged on both sides of the explosion valve 41. It can be understood that the spacing portions 43 on the second cover plate 40 can be provided in multiple numbers. When the battery is in thermal runaway and the inner core 20 moves towards the second cover plate 40, the plurality of spacing portions 43 can simultaneously block the moving inner core 20. Compared with a single spacing portion 43, the plurality of spacing portions 43 can improve the blocking and spacing effect and prevent the single spacing portion 43 from collapsing or being damaged due to insufficient strength when blocking the inner core 20. At the same time, the plurality of spacing portions 43 are respectively arranged on both sides of the explosion valve 41. Preferably, the spacing portions 43 arranged on both sides of the explosion valve 41 are symmetrical to each other. When the plurality of spacing portions 43 block the inner core 20, the force of the spacing portions 43 on the inner core 20 is relatively uniform, which better supports one end of the inner core 20. The thrust of the gas on the other end of the inner core 20 can be balanced with the supporting force of the plurality of spacing portions 43, thereby reducing the probability of the inner core 20 tilting and ensuring the safety of the inner core 20 to a certain extent (two opposite and staggered forces acting on the inner core 20 can cause damage to the inner core 20).

[0046] Referring to Figure 1 , Figure 4 and Figure 5 , in some embodiments, the second cover plate 40 is formed with a groove, which is arranged on the side of the spacing portion 43 away from the inner core 20. It can be understood that the spacing portion 43 is provided with a groove on the side away from the inner core 20, that is, there is an opening on the side away from the inner core 20. From the structure, the spacing portion 43 is in a recessed state on the side away from the inner core 20 and is in a protruding state on the side towards the inner core 20. The spacing portion 43 is a hollow structure, which can reduce the weight of the spacing portion 43 and the amount of processing material, thereby reducing the cost of structure production.

[0047] The main body portion 42 and the spacing portion 43 of the second cover plate 40 can be integrally processed and formed. This processing method can improve the strength of the connection between the main body portion 42 and the spacing portion 43 and reduce the probability of damage at the connection between the main body portion 42 and the spacing portion 43. At the same time, the main body portion 42 and the spacing portion 43 do not need to be processed separately, which can improve the processing efficiency of the second cover plate 40.

[0048] Referring to Figure 1 and Figure 2In some embodiments, the first cover plate 30 and the second cover plate 40 are arranged opposite to each other. That is, the two openings on the shell 10 for covering the first cover plate 30 and the second cover plate 40 are also arranged opposite to each other. This type of shell 10 is convenient to process, and the processed shell 10 has high strength and is conducive to the assembly of the battery structure. If the first cover plate 30 and the second cover plate 40 are arranged adjacent to each other, and the two openings on the shell 10 for covering the first cover plate 30 and the second cover plate 40 are also arranged adjacent to each other, although the requirements of the battery design can be met, this structure form will increase the processing difficulty of the shell 10, and is not conducive to the assembly of the battery structure.

[0049] Referring to Figure 1 and Figure 6 , in some embodiments, the battery monomer satisfies: D≤7mm; wherein D is the size of the interval part 43 protruding from the main body part 42 along the thickness direction X of the second cover plate 40. It can be understood that when the size of the interval part 43 protruding from the main body part 42 along the thickness direction X is within the range of less than or equal to 7mm, in the case of thermal runaway of the battery, the inner core 20 and the main body part 42 can play a good spacing role, avoiding the inner core 20 causing the explosion-proof valve 41 on the main body part 42 to be blocked, and ensuring that the gas inside the battery can be discharged through the explosion-proof valve 41. When D is greater than 7mm, the internal space of the accommodation cavity 11 occupied by the interval part 43 is larger, which will cause the volume of the inner core 20 to be smaller, the capacity of the inner core 20 to be reduced, which is not conducive to the design of large-capacity batteries, and cannot meet the use requirements of people.

[0050] Referring to Figure 1 , Figure 7 , Figure 9 and Figure 10 , in some embodiments, the battery monomer includes an insulating part 50.

[0051] The insulation piece 50 comprises a first insulation portion 51, which is arranged on the side of the second cover plate 40 facing the inner core 20. The first insulation portion 51 has a fitting groove 511, in which the spacing portion 43 is located. The first insulation portion 51 separates the inner core 20 and the spacing portion 43. It can be understood that the first insulation portion 51 on the insulation piece 50 is equivalent to a structure protruding towards the direction of the inner core 20. The side of the first insulation portion 51 away from the inner core 20 is provided with the fitting groove 511 corresponding to the spacing portion 43. When the insulation piece 50 is assembled with the second cover plate 40, the spacing portion 43 can be embedded in the corresponding fitting groove 511. This structure design can avoid the protruding spacing portion 43 hindering the connection of the insulation piece 50 and the second cover plate 40. At the same time, the first insulation portion 51 can separate the inner core 20 and the spacing portion 43, which can further increase the distance between the main body portion 42 and the inner core 20, and improve the spacing effect of the inner core 20 and the explosion-proof valve 41.

[0052] Please refer to Figure 1 and Figure 7 , in combination with the above embodiments, in some embodiments, the insulation piece 50 comprises a reinforcing portion 52.

[0053] The reinforcing portion 52 is located in the fitting groove 511 and connected with the first insulation portion 51. The reinforcing portion 52 extends along the length direction Y of the second cover plate 40, and / or the reinforcing portion 52 extends along the width direction Z of the second cover plate 40. It can be understood that, since the fitting groove 511 is opened in the first insulation portion 51, the strength of the first insulation portion 51 is reduced. The reinforcing portion 52 is arranged in the fitting groove 511. The reinforcing portion 52 can be provided with a plurality of reinforcing portions 52. Each reinforcing portion 52 extends along the length direction Y and is connected with the first insulation portion 51, which can increase the extrusion resistance of the first insulation portion 51 in the length direction Y. Alternatively, each reinforcing portion 52 extends along the width direction Z and is connected with the first insulation portion 51, which can increase the extrusion resistance of the first insulation portion 51 in the width direction Z. Alternatively, one part of each reinforcing portion 52 can extend along the length direction Y and be connected with the first insulation portion 51, and the other part can extend along the width direction Z and be connected with the first insulation portion 51. Thus, the reinforcing portion 52 can support the first insulation portion 51 in the length direction Y and the width direction Z, and increase the extrusion resistance of the first insulation portion 51 in the length direction Y and the width direction Z.

[0054] Please refer to Figure 1 and Figure 7In combination with the above embodiments, in some embodiments, the first insulation part 51 has the plurality of first through holes 512 and the communication fitting groove 511, the first through holes 512 extend along the thickness direction X of the second cover plate 40, and the orthographic projection of the spacing part 43 on the first insulation part 51 along the thickness direction X of the second cover plate 40 is located outside the first through holes 512. It can be understood that the plurality of first through holes 512 on the first insulation part 51 can communicate the fitting groove 511 and the accommodation cavity 11, so that part of the gas generated by the battery can enter the fitting groove 511 through the first through holes 512 when the battery is in thermal runaway, or the gas can flow out of the fitting groove 511 through the first through holes 512, thereby increasing the path and range of gas flow and preventing part of the gas from being blocked when the inner core 20 contacts the first insulation part 51 and unable to flow in the direction of the explosion-proof valve 41. At the same time, the plurality of first through holes 512 on the first insulation part 51 can reduce the weight of the insulation piece 50, thereby reducing the weight of the entire battery.

[0055] The orthographic projection of the spacing part 43 on the first insulation part 51 along the thickness direction X of the second cover plate 40 is located outside the first through holes 512, that is, parallel light rays are irradiated on the spacing part 43 along the thickness direction X, and the orthographic projection of the spacing part 43 on the first insulation part 51 is completely located at a position on the first insulation part 51 without the first through holes 512, that is, the first through holes 512 and the spacing part 43 are arranged in a staggered manner along the thickness direction X. When the battery is in thermal runaway, a large amount of gas is generated, part of the gas can enter the fitting groove 511 through the first through holes 512, and since the first through holes 512 and the spacing part 43 are arranged in a staggered manner, the gas will not directly act on the spacing part 43. This staggered arrangement can protect the spacing part 43 to a certain extent and prevent the gas with a large impact force from directly impacting on the spacing part 43 and damaging the spacing part 43.

[0056] Please refer to Figure 1 , Figure 7 , Figure 8 , Figure 9 and Figure 10In some embodiments, the first insulation part 51 has the plurality of second through holes 513 and the plurality of third through holes 514, and the plurality of second through holes 513 are arranged along the width direction Z of the second cover plate 40, and at least part of the second through holes 513 are arranged on one side of the first insulation part 51 along the length direction Y of the second cover plate 40. The first insulation part 51 has the plurality of second through holes 513 and the plurality of third through holes 514, and each of the third through holes 514 is arranged corresponding to one of the second through holes 513, and at least part of the third through holes 514 are arranged on the other side of the first insulation part 51 along the length direction Y. It can be understood that the second through holes 513 and the third through holes 514 are arranged on the first insulation part 51 along the length direction Y, at least part of the second through holes 513 are arranged on one side of the first insulation part 51 along the length direction Y of the second cover plate 40, and at least part of the third through holes 514 are arranged on the other side of the first insulation part 51 along the length direction Y, so that the gases on both sides of the first insulation part 51 along the length direction Y can flow through the second through holes 513 and the third through holes 514. When the battery is in thermal runaway, the inner core 20 can be attached to the first insulation part 51 under the action of the gas thrust, and the inner core 20 can block the plurality of first through holes 512, so that part of the gases generated inside the battery cannot flow in the direction of the explosion-proof valve 41 (for example, the gases on both sides of the inner core 20 along the length direction Y), which can cause the shell 10 to expand on both sides along the length direction Y. Through the second through holes 513 and the third through holes 514, the gases on both sides of the inner core 20 along the length direction Y can enter the fitting groove 511 through the second through holes 513, and then be discharged through the third through holes 514, so that the part of the gases can flow in the direction of the explosion-proof valve 41, and the gases generated inside the battery can be discharged smoothly as much as possible.

[0057] Please refer to Figure 1 , Figure 4 , Figure 7 and Figure 10 , in combination with the above embodiments, in some embodiments, the main body part 42 has a positioning groove 421 on the side facing the inner core 20. The insulation piece 50 further comprises a second insulation part 53 and a positioning part 54.

[0058] The second insulation part 53 is located on the side of the second cover plate 40 facing the inner core 20 and is connected with the first insulation part 51. The positioning part 54 is connected to the side of the second insulation part 53 facing the second cover plate 40 and is embedded in the positioning groove 421. It can be understood that when the insulation piece 50 is connected with the second cover plate 40, the positioning part 54 on the second insulation part 53 can be embedded into the corresponding positioning groove 421 on the main body part 42. The positioning part 54 and the positioning groove 421 play a positioning role in the connection of the insulation piece 50 and the second cover plate 40, realize the corresponding matching of the structural parts of the insulation piece 50 and the second cover plate 40, and can also avoid misalignment between the two during assembly, thereby improving the stability of the connection between the two.

[0059] Please refer to Figure 1 and Figure 7 , in combination with the above embodiments, in some embodiments, the insulation piece 50 further comprises a third insulation part 55. The third insulation part 55 is arranged on the side of the second insulation part 53 away from the first insulation part 51. The third insulation part 55 has a connecting groove 551 arranged towards the explosion-proof valve 41, and a plurality of first flow holes 552 and a plurality of second flow holes 553 in communication with the connecting groove 551. The plurality of first flow holes 552 are arranged through the bottom wall of the connecting groove 551 in the thickness direction X of the second cover plate 40. At least part of the plurality of second flow holes 553 are arranged through the side wall of the connecting groove 551 in the length direction Y of the second cover plate 40. It can be understood that the third insulation part 55 on the insulation piece 50 is arranged at the position of the explosion-proof valve 41. When the battery is in thermal runaway, the gas generated inside the battery can press the explosion-proof valve 41 through the connecting groove 551 and the plurality of first flow holes 552 on the third insulation part 55. When the gas reaches a certain pressure, the explosion-proof valve 41 can be opened to release pressure. If the inner core 20 of the battery is pushed by the gas, the inner core 20 can abut against the third insulation part 55, which can cause the plurality of first flow holes 552 to be blocked, so that the gas generated by thermal runaway cannot enter the connecting groove 551 through the plurality of first flow holes 552. Since at least part of the plurality of second flow holes 553 are arranged through the side wall of the connecting groove 551 in the length direction Y of the second cover plate 40, at least part of the second flow holes 553 are arranged on the side of the third insulation part 55 in the length direction Y. The inner core 20 cannot completely shield these second flow holes 553, so the gas generated by thermal runaway can enter the connecting groove 551 through the plurality of second flow holes 553, ensuring that the gas generated by thermal runaway can be smoothly discharged through the explosion-proof valve 41, so that the battery can be normally released.

[0060] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0061] The battery cell provided by the embodiments of the present application is described in detail above, and the principle and implementation manner of the present application are described by applying specific examples. The above embodiment description is only used to help understand the technical solutions of the present application and the core idea thereof. It should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features thereof can be replaced equivalently; and the modification or replacement does not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell (10) having a containing cavity (11); an inner core (20) arranged in the containing cavity (11); a first cover plate (30) and a second cover plate (40) are arranged on different sides of the shell (10), the first cover plate (30) is provided with a pole (31), and the second cover plate (40) is provided with an explosion-proof valve (41); the second cover plate (40) comprises a main body part (42) and a spacing part (43) connected with each other, the main body part (42) is connected to the shell (10), and the spacing part (43) is arranged on one side of the main body part (42) facing the inner core (20) in a protruding mode and is used for spacing the inner core (20) and the main body part (42).

2. The battery cell of claim 1, wherein, The second cover plate (40) comprises a plurality of spacing parts (43), and the plurality of spacing parts (43) are arranged on both sides of the explosion-proof valve (41) respectively.

3. The battery cell of claim 1, wherein, The second cover plate (40) is formed with a groove, and the groove is arranged on one side of the spacing part (43) away from the inner core (20).

4. The battery cell of claim 1, wherein, The opposite sides of the shell (10) are respectively provided with the first cover plate (30) and the second cover plate (40).

5. The battery cell of claim 1, wherein, The battery monomer satisfies: D≤7mm; Wherein, D is the size of the spacing part (43) protruding from the main body part (42) along the thickness direction (X) of the second cover plate (40).

6. The battery cell of claim 1, wherein, The battery monomer comprises: an insulating part (50), the insulating part (50) comprises a first insulating part (51), the first insulating part (51) is arranged on one side of the second cover plate (40) facing the inner core (20), the first insulating part (51) has a matching groove (511), the spacing part (43) is located in the matching groove (511), and the first insulating part (51) spaces the inner core (20) and the spacing part (43).

7. The battery cell of claim 6, wherein, The insulating part (50) comprises: a reinforcing part (52) located in the matching groove (511) and connected with the first insulating part (51), the reinforcing part (52) extends along the length direction (Y) of the second cover plate (40), and / or the reinforcing part (52) extends along the width direction (Z) of the second cover plate (40).

8. The battery cell of claim 6, wherein, The first insulating part (51) has a plurality of first through holes (512) communicating the matching groove (511) and the containing cavity (11), the first through holes (512) extend along the thickness direction (X) of the second cover plate (40), and the orthogonal projection of the spacing part (43) on the first insulating part (51) along the thickness direction (X) of the second cover plate (40) is located outside the first through holes (512).

9. The battery cell of claim 8, wherein, The first insulating part (51) has a plurality of second through holes (513) communicating the matching groove (511) and the containing cavity (11), the plurality of second through holes (513) are arranged at intervals along the width direction (Z) of the second cover plate (40), and at least part of the second through holes (513) is arranged on one side of the first insulating part (51) along the length direction (Y) of the second cover plate (40); The first insulation part (51) has a plurality of third through holes (514) communicating the matching groove (511) and the accommodating cavity (11), each of the third through holes (514) is arranged correspondingly with one of the second through holes (513), and at least part of the third through holes (514) are arranged on the other side of the first insulation part (51) along the length direction (Y).

10. The battery cell of claim 6, wherein, The main body part (42) has a positioning groove (421) on the side facing the inner core (20); the insulation part (50) further comprises: A second insulation part (53) is arranged on the side of the second cover plate (40) facing the inner core (20) and connected with the first insulation part (51); A positioning part (54) is connected on the side of the second insulation part (53) facing the second cover plate (40) and embedded in the positioning groove (421).

11. The battery cell of claim 10, wherein, The insulation part (50) further comprises: A third insulation part (55) is arranged on the side of the second insulation part (53) away from the first insulation part (51), the third insulation part (55) has a connecting groove (551) arranged towards the explosion-proof valve (41), and a plurality of first flow holes (552) and a plurality of second flow holes (553) communicating with the connecting groove (551), a plurality of the first flow holes (552) are arranged through the bottom wall of the connecting groove (551) along the thickness direction (X) of the second cover plate (40), and at least part of the plurality of second flow holes (553) are arranged through the side wall of the connecting groove (551) along the length direction (Y) of the second cover plate (40).

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