CN216958403U

CN216958403U - Battery core and battery module

Info

Publication number: CN216958403U
Application number: CN202123315923.0U
Authority: CN
Inventors: 杜俊丰; 邓江南; 桂昊; 金佺良; 梁策; 於洪将
Original assignee: Jiangsu Zenergy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenergy Battery Technologies Co Ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-07-12
Anticipated expiration: 2031-12-27

Abstract

The utility model discloses a battery core and a battery module, and relates to the technical field of batteries; the battery cell comprises a shell, a pole core and a pole cover assembly; openings are formed in two ends of the shell, and a plurality of safety valves are arranged between the two ends of the shell; the pole core is arranged in the shell; the polar cap subassembly is including covering first polar cap and the second polar cap of locating two openings parts respectively, and first polar cap is equipped with the anodal post of being connected with the anodal electricity of utmost point core, and the second polar cap is equipped with the negative pole post of being connected with the negative pole electricity of utmost point core. On one hand, the battery cell can rapidly discharge the pressure in the battery cell when the battery cell is out of control due to thermal runaway through the arrangement of the safety valves, so that the controllability of the out of control due to thermal runaway is improved, and the safety performance of the battery cell and the battery module is improved; on the other hand, the positive and negative poles of the battery core are positioned at two ends of the battery core, so that the height size of the battery core can be reduced, the space utilization rate of the battery core is improved, and the space utilization rate of the battery module is improved.

Description

Battery core and battery module

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery core and a battery module.

Background

Among the prior art, when the electric core of battery module takes place the thermal runaway, the inside pressure of electric core can't be effectively just excreted fast to the relief valve for the relief valve damages easily, leads to electric core thermal runaway's controllability to reduce, thereby has leaded to the security performance reduction of battery module.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a battery cell and a battery module, wherein the battery cell has high thermal runaway controllability and high safety performance.

The embodiment of the utility model is realized by the following steps:

in a first aspect, the present invention provides a battery cell, including:

the safety valve comprises a shell, a plurality of safety valves and a plurality of safety valves, wherein openings are formed in two ends of the shell;

the pole core is arranged in the shell;

the polar cap assembly comprises a first polar cap and a second polar cap which are respectively arranged at two openings, the first polar cap is provided with a positive pole column electrically connected with the positive pole of the polar core, and the second polar cap is provided with a negative pole column electrically connected with the negative pole of the polar core.

In an alternative embodiment, a plurality of safety valves are spaced along the length of the housing.

In an alternative embodiment, the length of the housing is L and the number of safety valves N is rounded up from L/300.

In an alternative embodiment, each safety valve is of a kidney-shaped trough-like configuration.

In an optional embodiment, two arc-shaped extension grooves which are tangent and symmetrically distributed are further formed at the bottom of the kidney-shaped groove of each safety valve, and the arc-shaped extension grooves are used for enabling the safety valves to break along the extension direction of the arc-shaped extension grooves when the battery cell is out of control due to heat.

In an alternative embodiment, the depth of the arc-shaped extension groove is 45% -60% of the thickness of the groove bottom of the kidney-shaped groove.

In an optional embodiment, the first pole cover further includes a first cover plate and a first insulating member, the first insulating member is disposed on a first side of the first cover plate, the positive pole is disposed on a second side of the first cover plate, first pole holes are disposed at positions of the first cover plate and the first insulating member opposite to the positive pole, and the positive pole is exposed through the first pole hole to be electrically connected to the positive pole of the pole core;

the second pole cover further comprises a second cover plate and a second insulating piece, the second insulating piece is arranged on the first side of the second cover plate, the negative pole posts are arranged on the second side of the second cover plate, second pole post holes are formed in the positions, opposite to the positive pole posts, of the second cover plate and the second insulating piece, and the negative pole posts are exposed through the second pole post holes to be electrically connected with the negative poles of the pole cores.

In an alternative embodiment, the first insulating member has a first protrusion protruding toward the pole core, and the first protrusion abuts against the pole core; the second insulating part is provided with a second bulge convexly arranged towards the pole core direction, and the second bulge is abutted against the pole core;

one or more liquid injection holes are also formed in the shell, and when the liquid injection holes are opposite to the first bulges or the second bulges, the first bulges or the second bulges are provided with avoidance grooves opposite to the liquid injection holes.

In an optional embodiment, a sealing nail is arranged at the liquid injection hole, and structural adhesive is hermetically connected between the circumferential direction of the sealing nail and the shell.

In an optional embodiment, a first annular sinking groove and a second annular sinking groove are respectively sunken at two ends of the housing, the first cover plate is accommodated in the first annular sinking groove, so that the outer surface of the first cover plate is flush with the end surface of the housing, and the second cover plate is accommodated in the second annular sinking groove, so that the outer surface of the second cover plate is flush with the end surface of the housing.

In a second aspect, the present invention provides a battery module, which includes a plurality of battery cells according to any one of the foregoing embodiments.

In an alternative embodiment, the safety valves of the plurality of cells are arranged in a row a and a column B, where a and B are both positive integers greater than 1.

In an optional embodiment, the battery module comprises an annular shell with openings at two ends, and a plurality of battery cells are arranged in the annular shell; the battery module is still including setting up in the first curb plate and the second curb plate of the opening part at cyclic annular shell both ends, and first curb plate and second curb plate all extend along the direction of piling up of a plurality of electric cores, and first curb plate is close to one side that electric core has the relief valve, and with the relief valve dislocation set of electric core for press from both sides tight a plurality of electric cores along the direction of piling up of a plurality of electric cores, one side that electric core has the relief valve is kept away from to the second curb plate, one side that is used for following the direction of piling up of a plurality of electric cores and presss from both sides tight a plurality of electric cores.

The embodiment of the utility model has at least the following advantages or beneficial effects:

the embodiment of the utility model provides a battery cell, which comprises a shell, a pole core and a pole cover assembly, wherein the shell is provided with a plurality of through holes; openings are formed in two ends of the shell, and a plurality of safety valves are arranged between the two ends of the shell; the pole core is arranged in the shell; the polar cap subassembly is including covering first polar cap and the second polar cap of locating two openings parts respectively, and first polar cap is equipped with the anodal post of being connected with the anodal electricity of utmost point core, and the second polar cap is equipped with the negative pole post of being connected with the negative pole electricity of utmost point core. On one hand, the battery cell can rapidly discharge the pressure in the battery cell when the battery cell is out of control due to thermal runaway through the arrangement of the safety valves, so that the controllability of the out of control due to thermal runaway is improved, and the safety performance of the battery cell and the battery module is improved; on the other hand, the positive and negative poles of the battery core are positioned at two ends of the battery core, so that the height size of the battery core can be reduced, the space utilization rate of the battery core is improved, and the space utilization rate of the battery module is improved.

The embodiment of the utility model also provides a battery module which comprises the battery core. Therefore, the battery module also has the advantages of high safety performance and high space utilization rate.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

fig. 2 is a schematic partial structure diagram of a battery module according to an embodiment of the utility model;

fig. 3 is a first schematic structural diagram of a battery cell according to an embodiment of the present invention;

fig. 4 is a second schematic structural diagram of a battery cell according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a safety valve of a battery cell according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a first pole cover of a battery cell according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a second pole cover of a battery cell according to an embodiment of the present invention;

fig. 8 is a schematic partial cross-sectional view of a cell according to an embodiment of the present invention;

fig. 9 is a schematic partial cross-sectional view of a battery cell according to an embodiment of the present invention.

100-battery module; 101-an annular housing; 103-a first end plate; 105-a second end plate; 107-cover plate; 109-electric core; 110-pole core; 111-a housing; 113-safety valve; 115-liquid injection hole; 117-first pole cap; 119-positive column; 121-a second pole cap; 123-negative pole column; 125-arc extension groove; 127-a first cover plate; 129-a second cover plate; 131-a first insulator; 133-a second insulator; 135-a first protrusion; 137-a second protrusion; 139-avoidance groove; 141-a first annular sink; 143-second annular sink; 145-positive pole switching piece; 147-a negative patch; 149-a first side panel; 151-a first plate; 153-a second side panel; 155-second plate body.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the correlation technique, when the electric core of battery module takes place the thermal runaway, the inside pressure of electric core can't effectively just excrete fast to the relief valve for the easy damage of relief valve leads to electric core thermal runaway's controllability to reduce, thereby has leaded to the security performance of battery module to reduce.

In view of this, this embodiment provides an electric core and battery module that electric core thermal runaway controllability is high, and the security performance is high, and simultaneously, this electric core and battery module still have the advantage that space utilization is high. The structure of the battery module will be described in detail below.

Fig. 1 is a schematic structural diagram of a battery module 100 provided in this embodiment; fig. 2 is a schematic view of a partial structure of the battery module 100 according to the present embodiment. Referring to fig. 1 and fig. 2, the present embodiment provides a battery module 100, which includes an annular casing 101 and a plurality of battery cells 109.

The annular housing 101 has a rectangular parallelepiped annular structure with openings at two ends, and the annular housing 101 specifically includes two first end plates 103 and two second end plates 105. The two first end plates 103 are disposed at intervals along a first direction (i.e., ab direction in fig. 2, also the length direction of the battery cell 109), and the two second end plates 105 are disposed at intervals between the two first end plates 103 along a second direction (i.e., cd direction in fig. 2, also the thickness direction of the battery cell 109) that forms an included angle with the first direction, so that the two first end plates 103 and the two second end plates 105 together enclose the annular casing 101.

The plurality of battery cells 109 are disposed in the annular housing 101 side by side, a length direction of each battery cell 109 is a connection line direction of the two first end plates 103, that is, a first direction, a side by side direction of each battery cell 109 is a connection line direction of the two second end plates 105, that is, a second direction, and a height direction of each battery cell 109 is a third direction (that is, an ef direction in fig. 2).

Fig. 3 is a first schematic structural diagram of the battery cell 109 provided in this embodiment; fig. 4 is a structural schematic diagram of the battery cell 109 provided in this embodiment. Referring to fig. 2 to 4, in the present embodiment, each battery cell 109 includes a casing 111, a pole core 110, and a pole cover assembly.

The housing 111 is also substantially rectangular parallelepiped, and has a square ring structure with openings at two ends. The pole core 110 is a bare cell 109 and is disposed in the square ring structure of the casing 111. The pole cover assembly includes a first pole cover 117 and a second pole cover 121 respectively covering two openings of the case 111, the first pole cover 117 has a positive pole column 119 electrically connected with a positive pole of the pole core 110, and the second pole cover 121 has a negative pole column 123 electrically connected with a negative pole of the pole core 110, so that the pole core 110 can normally perform charging and discharging operations. Meanwhile, a plurality of safety valves 113 are provided between both ends of the case 111, and the plurality of safety valves 113 are each located at a side portion of the pole piece 110 to release the pressure of the battery cell 109 when the battery cell 109 thermally runaway.

On the one hand, this electricity core 109 can discharge the inside pressure of electricity core 109 fast when thermal runaway appears in electricity core 109 through setting up of a plurality of relief valves 113, prevents thermal runaway transmission to other electricity cores 109 or battery module 100 to improve thermal runaway's controllability, thereby improve the security performance of electricity core 109 and battery module 100. On the other hand, the positive and negative poles 123 of the battery cell 109 are located at two ends of the battery cell 109, so that the size of the battery cell 109 in the height direction can be reduced, the space utilization rate of the battery cell 109 can be improved, and the space utilization rate of the battery module 100 can be improved.

Referring to fig. 2 to 4 again, in the present embodiment, the safety valves 113 are arranged at intervals along the length direction of the casing 111 (also the length direction of the battery cell 109). Through this setting for a plurality of relief valves 113 can be relative with a plurality of positions on the electric core 109 length, thereby be convenient for when electric core 109 optional position takes place the thermal runaway homoenergetic discharge pressure effectively, prevent the thermal runaway transmission to other electric cores 109 or battery module 100, and then improve the security performance of electric core 109 and battery module 100 and the controllability of thermal runaway.

In detail, in the present embodiment, the number of the safety valves 113 is related to the length of the casing 111, that is, the number of the safety valves 113 is related to the length of the entire battery cell 109. And in particular with the length L of the housing 111, the number N of safety valves 113 is rounded up from L/300. The arrangement is such that one safety valve 113 can be arranged every 300mm apart in the length of the shell 111, and when the length dimension is between 300 and 600mm, two safety valves 113 are arranged, and when the length dimension is between 600 and 900mm, three safety valves 113 are arranged, and so on. Through setting up like this, can fully improve the controllability of electric core 109 thermal runaway, guarantee battery module 100's security performance.

In more detail, in the present embodiment, after the plurality of battery cells 109 are all installed in the annular housing 101 of the battery module 100, the plurality of safety valves 113 of the plurality of battery cells 109 are arranged in a row a and a column B, where a and B are positive integers greater than 1. For example, as shown in fig. 2, the battery module 100 provided in this embodiment includes twelve battery cells 109, each battery cell 109 includes two safety valves 113, and then the safety valves 113 of the twelve battery cells 109 are arranged in twelve rows and two columns. Through setting up like this, be convenient for going on of processing, manufacturing and the installation operation of electric core 109, also can guarantee the controllability of electric core 109 thermal runaway effectively to improve battery module 100's security and reliability fully, guarantee the normal clear of charge-discharge operation. Of course, in other embodiments, the number of the battery cells 109 of each battery module 100 and the number of the safety valves 113 of each battery cell 109 may be adjusted according to requirements, and this embodiment is not described again.

As an optional solution, in this embodiment, the battery module 100 further includes a first side plate 149 and a second side plate 151 disposed at openings at two ends of the annular casing 101, and the first side plate 149 and the second side plate 151 both extend along the stacking direction of the plurality of battery cells 109. And the first side plate 149 is close to one side of the battery cell 109 having the safety valve 113, and is disposed in a staggered manner with the safety valve 113 of the battery cell 109, so as to clamp the upper ends of the battery cells 109 along the stacking direction of the battery cells 109, and the second side plate 151 is away from one side of the battery cell 109 having the safety valve 113, so as to clamp the lower ends of the battery cells 109 along the stacking direction of the battery cells 109. On one hand, the strength of the annular casing 101 is higher through the arrangement of the first side plate 149 and the second side plate 151, and the battery cells 109 can be clamped through the arrangement of the first side plate 149 and the second side plate 151, so that the stability and reliability of the stacked battery cells 109 are fully improved, and the safety, reliability and stability of charging and discharging operations can be ensured; on the other hand, the setting of staggering of the relief valve 113 of first curb plate 149 and electric core 109 for relief valve 113 is avoided in the installation of first curb plate 149, thereby can guarantee that relief valve 113 can carry out the pressure release operation effectively when electric core 109 thermal runaway, thereby further guarantee battery module 100's security performance.

It should be noted that, in this embodiment, the first side plate 149 specifically includes a plurality of first plate bodies 151 disposed at intervals along the length direction of the battery cell 109, and the safety valve 113 of the battery cell 109 can be exposed from a gap between adjacent first plate bodies 151, so that the safety valve 113 and the first plate bodies 151 are completely disposed in a staggered manner. Meanwhile, each first plate 151 is substantially U-shaped, and both ends of each first plate 151 are fixedly connected to the upper ends of the two second end plates 105 of the annular housing 101, so as to effectively clamp the upper end of the battery cell 109, stabilize the battery cell 109, and ensure stable operation of charging and discharging. Meanwhile, the second side plate 151 specifically includes a plurality of second plate bodies 155 disposed at intervals along the length direction of the battery cell 109, each second plate body 155 is substantially in a U-shaped structure, and both ends of each second plate body 155 are fixedly connected to the lower ends of the two second end plates 105 of the annular casing 101, so as to effectively clamp the lower end of the battery cell 109, so as to stabilize the battery cell 109 and ensure stable charging and discharging operations.

It should be further noted that, in this embodiment, the number of the first plate 151 and the second plate 155 is three, so that the two safety valves 113 of each battery cell 109 can be exposed from the gap between two corresponding adjacent first plate 151, so as to ensure the safety and reliability of the battery module 100. Of course, in other embodiments, the number and shape of the first plate 151 and the second plate 155 can be adjusted according to the requirement, so as to ensure the safety and reliability of the battery module 100, which is not limited in this embodiment.

Fig. 5 is a schematic structural diagram of the safety valve 113 of the battery cell 109 provided in this embodiment. Referring to fig. 2 to 5, in the present embodiment, each safety valve 113 has a kidney-shaped groove structure. By the arrangement, the cell 109 can be broken along the shape of the safety valve 113 when being out of control due to heat, and the pressure of the cell 109 can be discharged in time.

Optionally, in this embodiment, two arc-shaped extension grooves 125 that are tangential and symmetrically distributed are further formed at the bottom of the kidney-shaped groove of each safety valve 113, and the arc-shaped extension grooves 125 are used for breaking the safety valve 113 according to the extension direction of the arc-shaped extension grooves 125 when the battery cell 109 is thermally runaway. Through the setting of two arc extending groove 125 for when electric core 109 thermal runaway, the extending direction who follows arc extending groove 125 is changeed and is broken, thereby further improves electric core 109 thermal runaway's controllability, further prevents the thermal runaway diffusion, with the security of guaranteeing battery module 100.

Further optionally, in this embodiment, the depth of the arc-shaped extension groove 125 is 45% -60% of the thickness of the groove bottom of the kidney-shaped groove. Through setting up like this, can not only guarantee that electric core 109 normally works, can also break in time in order to release pressure when electric core 109 thermal runaway to fully improve battery module 100's security performance.

Fig. 6 is a schematic structural diagram of a first pole cover 117 of the battery cell 109 provided in this embodiment; fig. 7 is a schematic structural diagram of a second pole cover 121 of the battery cell 109 provided in this embodiment; fig. 8 is a schematic partial cross-sectional view of a battery cell 109 provided in this embodiment; fig. 9 is a schematic partial cross-sectional view of the battery cell 109 provided in this embodiment. Referring to fig. 6 and 8, in the present embodiment, the first pole cover 117 further includes a first cover plate 127 and a first insulating member 131. The first cover plate 127 is a flat plate structure, and the first insulating member 131 is disposed on a first side of the first cover plate 127 to provide insulating performance and ensure normal operation of charging and discharging operations. Meanwhile, the positive post 119 is disposed on the second side of the first cover plate 127, first post holes are formed in positions of the first cover plate 127 and the first insulating member 131 opposite to the positive post 119, and the positive post 119 is exposed through the first post holes to be electrically connected with the positive electrode of the pole core 110.

Referring to fig. 7 and 9, in the present embodiment, the second cover 121 further includes a second cover plate 129 and a second insulating member 133. The second cover plate 129 has a flat plate structure, and the second insulating member 133 is disposed on a first side of the second cover plate 129 to provide insulating performance and ensure normal operation of charging and discharging operations. Meanwhile, the negative post 123 is disposed on a second side of the second cover plate 129, a second post hole is opened at a position where the second cover plate 129 and the second insulating member 133 are opposite to the positive post 119, and the negative post 123 is exposed through the second post hole to be electrically connected to the negative electrode of the pole core 110.

Through setting up like this, can guarantee the security of the operation of charging and discharging of electricity core 109. Meanwhile, in this embodiment, the positive post 119 and the positive electrode of the pole core 110 and the negative post 123 and the negative electrode of the pole core 110 may be directly welded and fitted for electrical connection, or may be connected through an intermediate adapter plate, for example, as shown in fig. 8, a positive adapter plate 145 is connected between the positive post 119 and the positive electrode of the pole core 110, one end of the positive adapter plate 145 is welded to the positive post 119, and the other end is welded to the positive electrode of the pole core 110. Similarly, a negative adapter 147 is connected between the negative pole post 123 and the negative pole of the pole core 110, one end of the negative adapter 147 is welded to the negative pole post 123, and the other end is welded to the negative pole of the pole core 110, so as to fully ensure the normal operation of the charge and discharge operations of the battery cell 109.

Referring to fig. 6 and 8 again, in the present embodiment, the first insulating member 131 has two first protrusions 135 protruding toward the pole core 110, the first protrusions 135 are respectively located at upper and lower positions of the first cover plate 127, and the two first protrusions 135 are respectively abutted against the upper and lower positions of the pole core 110 in the thickness direction, so as to limit the position of the pole core 110, provide a positioning function, and ensure the safety and reliability of the pole core 110.

Meanwhile, referring to fig. 7 and 9 again, in the present embodiment, the second insulating member 133 also has two second protrusions 137 protruding toward the pole core 110, the two second protrusions 137 are respectively located at the upper and lower positions of the second cover 129, and the two second protrusions 137 respectively abut against the upper and lower positions of the pole core 110 in the thickness direction, so as to limit the movement of the pole core 110 together with the first protrusion 135, thereby improving the stability and reliability of the pole core 110, and ensuring the safety and reliability of the battery module 100.

In detail, in order to ensure the electrolyte injection operation, the casing 111 is further provided with injection holes 115, and the number of the injection holes 115 may be one or more. When the pour hole 115 is opposed to the first projection 135 or the second projection 137, the first projection 135 or the second projection 137 is provided with an escape groove 139 opposed to the pour hole 115. For example, as shown in fig. 7 and fig. 9, the liquid injection hole 115 is opposite to the second protrusion 137, and a avoiding groove 139 is formed in a corresponding position of the second protrusion 137, so as to ensure that the liquid injection operation is performed smoothly, and thus, the battery cell 109 can perform the charging and discharging operation normally.

It should be noted that, in the present embodiment, the avoiding groove 139 is an arc-shaped groove penetrating through the second protrusion 137, so as to provide an avoiding function sufficiently. In other embodiments, the shape of the avoiding groove 139 may also be adjusted according to requirements, and the requirement of the liquid injection operation may be met, which is not limited in this embodiment.

Optionally, in this embodiment, a sealing nail is disposed at the liquid injection hole 115, and a structural adhesive is hermetically connected between a circumferential direction of the sealing nail and the casing 111. That is, in this embodiment, the liquid injection hole 115 is sealed and fixed by a sealing nail and a structural adhesive, which can effectively prevent the electrolyte from overflowing, thereby further ensuring the safety and reliability of the battery cell 109 and improving the safety and reliability of the battery module 100.

Referring to fig. 8 and 9 again, in the present embodiment, the first annular sinking groove 141 and the second annular sinking groove 143 are respectively formed at two ends of the housing 111 in a sinking manner. Wherein, the first annular sinking groove 141 and the second annular sinking groove 143 are both located at the extreme end of the housing 111 and are arranged around the circumference of the end opening of the housing 111. The arrangement is such that the first cover plate 127 is received in the first annular recess 141 such that the outer surface of the first cover plate 127 is flush with the end face of the housing 111, projecting only from the positive post 119, and such that the second cover plate 129 is also received in the second annular recess 143 such that the outer surface of the second cover plate 129 is flush with the end face of the housing 111, projecting only from the negative post 123. On one hand, the arrangement can limit the positions of the first cover plate 127 and the second cover plate 129 through the first annular sinking groove 141 and the second annular sinking groove 143, provide positioning and limiting effects, and ensure the compactness and reliability of the whole battery cell 109 structure, thereby ensuring the normal operation of charging and discharging operations; on the other hand, the first cover plate 127 and the second cover plate 129 are both sunk into the housing 111, so that the space occupied by the whole battery cell 109 in the length direction is smaller, the structure is more compact and reliable, and the space utilization rate of the battery module 100 can be further improved.

In the present embodiment, the first cover plate 127 and the housing 111, and the second cover plate 129 and the housing 111 can be connected by a welding fit, for example, a laser side seam welding, a carbon dioxide shield welding, a CMT welding, or the like, preferably a laser side seam welding, so as to ensure the strength and the sealing property of the connection.

Referring to fig. 1 again, in the present embodiment, the battery module 100 further includes a cover plate 107 connected to the annular casing 101, the cover plate 107 is capable of being welded to the annular casing 101, and the cover plate 107 is disposed outside a side of the plurality of battery cells 109 where the safety valve 113 is disposed, so as to further improve the safety of the battery module 100.

The following describes in detail the installation process, operation principle and advantageous effects of the battery module 100 according to the embodiment of the present invention:

when the battery module 100 is mounted, the two first end plates 103 and the two second end plates 105 are connected to form the annular housing 101, the plurality of battery cells 109 are mounted in the annular housing 101, and the cover plate 107 and the annular housing 101 are welded together. When the battery cell 109 is installed, the positive post 119 of the first cover plate 117 may be welded to the core 110, the core 110 is then placed in the casing 111, the circumferential direction of the first cover plate 127 is welded to the casing 111, the negative post 123 of the second cover plate 121 is welded to the core 110, and the circumferential direction of the second cover plate 129 is welded to the casing 111.

When this battery module 100 carries out the charge-discharge operation, if thermal runaway appears in arbitrary electric core 109, this a plurality of relief valves 113 on the electric core 109 length direction all can be effectively with pressure discharge to guarantee electric core 109's security. In this process, on one hand, the battery cell 109 can rapidly discharge the pressure inside the battery cell 109 when the battery cell 109 is in thermal runaway through the arrangement of the safety valves 113, so as to improve the controllability of the thermal runaway, thereby improving the safety performance of the battery cell 109 and the battery module 100; on the other hand, because the positive and negative poles 123 of the battery cell 109 are located at two ends of the battery cell 109, the height of the battery cell 109 can be reduced, and the space utilization rate of the battery cell 109 is improved, so that the space utilization rate of the battery module 100 is improved.

In summary, the embodiment of the present invention provides the battery cell 109 and the battery module 100, where the battery cell 109 has high thermal runaway controllability and high safety performance.

The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell, comprising:

a pole piece disposed within the housing;

the polar cap assembly comprises a first polar cap and a second polar cap, the first polar cap and the second polar cap are respectively covered on the two openings, the first polar cap is provided with a positive pole column electrically connected with a positive pole of the polar core, and the second polar cap is provided with a negative pole column electrically connected with a negative pole of the polar core.

2. The cell of claim 1, wherein:

the safety valves are arranged at intervals along the length direction of the shell.

3. The cell of claim 2, wherein:

the length of the shell is L, and the number N of the safety valves is obtained by rounding up from L/300.

4. The electrical core of claim 1, wherein:

each safety valve is of a waist-shaped groove-shaped structure.

5. The electrical core of claim 4, wherein:

two arc-shaped extension grooves which are tangent and symmetrically distributed are further formed in the bottom of the kidney-shaped groove of each safety valve, and the arc-shaped extension grooves are used for enabling the safety valves to break according to the extension directions of the arc-shaped extension grooves when the battery core is out of control due to heat.

6. The electrical core of claim 5, wherein:

the depth of the arc-shaped extension groove is 45-60% of the thickness of the groove bottom of the kidney-shaped groove.

7. The electrical core of any of claims 1 to 6, wherein:

the first pole cover further comprises a first cover plate and a first insulating part, the first insulating part is arranged on the first side of the first cover plate, the positive pole is arranged on the second side of the first cover plate, first pole holes are formed in the positions, opposite to the positive pole, of the first cover plate and the first insulating part, and the positive pole is exposed through the first pole holes and is electrically connected with the positive pole of the pole core;

the second pole cover further comprises a second cover plate and a second insulating part, the second insulating part is arranged on the first side of the second cover plate, the negative pole posts are arranged on the second side of the second cover plate, second pole post holes are formed in the positions, opposite to the positive pole posts, of the second cover plate and the second insulating part, and the negative pole posts are exposed out of the second pole post holes to be electrically connected with the negative poles of the pole cores.

8. The cell of claim 7, wherein:

the first insulating part is provided with a first bulge which is convexly arranged towards the pole core direction, and the first bulge is abutted against the pole core; the second insulating part is provided with a second bulge which is convexly arranged towards the pole core direction, and the second bulge is abutted against the pole core;

the casing is further provided with one or more liquid injection holes, and when the liquid injection holes are opposite to the first bulges or the second bulges, the first bulges or the second bulges are provided with avoiding grooves opposite to the liquid injection holes.

9. The cell of claim 8, wherein:

and a sealing nail is arranged at the liquid injection hole, and a structural adhesive is hermetically connected between the circumferential direction of the sealing nail and the shell.

10. The cell of claim 7, wherein:

the two ends of the shell are respectively provided with a first annular sinking groove and a second annular sinking groove in a sinking mode, the first cover plate is contained in the first annular sinking groove, the outer surface of the first cover plate is flush with the end face of the shell, and the second cover plate is contained in the second annular sinking groove, so that the outer surface of the second cover plate is flush with the end face of the shell.

11. A battery module comprising a plurality of the cells of any one of claims 1 to 10.

12. The battery module according to claim 11, wherein:

and the safety valves of the battery cells are arranged in A rows and B columns, wherein A and B are positive integers greater than 1.

13. The battery module according to claim 11, wherein:

the battery module comprises an annular shell with openings at two ends, and a plurality of battery cells are arranged in the annular shell; the battery module is still including set up in the first curb plate and the second curb plate of the opening part at cyclic annular shell both ends, first curb plate with the second curb plate is all along a plurality ofly the direction of piling up of electric core extends, just first curb plate is close to electric core has one side of relief valve, and with the relief valve dislocation set of electric core is used for along a plurality of the direction of piling up of electric core presss from both sides tightly a plurality ofly electric core, the second curb plate is kept away from electric core has one side of relief valve is used for along a plurality of the direction of piling up of electric core presss from both sides tightly a plurality ofly electric core.