CN218351657U - Battery cell, battery module, battery pack, electric device and equipment for preparing battery cell - Google Patents

Abstract

The utility model discloses an electric core, a battery module, a battery pack, an electric device and equipment for preparing the electric core, relating to the technical field of batteries; the battery cell comprises a shell, a winding core and an explosion-proof valve; the shell is provided with a positive pole column and a negative pole column, and one side without the positive pole column and the negative pole column is provided with an explosion-proof port; the winding core is arranged in the shell, the positive tab is electrically connected with the positive post, and the negative tab is electrically connected with the negative post; the explosion-proof valve sets up in explosion-proof mouthful department, and the explosion-proof valve includes explosion-proof piece and supplementary piece that splits, and supplementary piece that splits is used for assisting the explosion-proof piece when the explosion-proof piece receives the impact force along the pressure release direction and breaks, still is used for preventing the explosion-proof piece to break along the opposite direction of pressure release direction. This electric core can realize the one-way explosion-proof of explosion-proof piece in the pressure release side through supplementary setting of piece that splits for the explosion-proof piece is difficult for opening by accident under the external environment effect of casing, can also reduce the thermal runaway's between arbitrary adjacent electric core influence, prevents the thermal runaway diffusion, improves the security performance.

Description

Battery cell, battery module, battery pack, electric device and equipment for preparing battery cell

Technical Field

The utility model relates to a battery technology field particularly, relates to the equipment of electricity core, battery module, battery package, power consumption device and preparation electricity core.

Background

The positive post and the negative pole post interval of traditional electric core set up in one side of casing, and the explosion-proof mouth is seted up in the position of casing between positive post and negative pole post. By the arrangement, when the explosion-proof port is used for pressure relief, the discharged molten substances easily influence the positive pole column and the negative pole column, so that risks such as short circuit are caused. Therefore, in the prior art, the explosion-proof opening is arranged at a position away from the positive pole and the negative pole. However, the battery cell arranged in this way still cannot solve the problem that the battery cell diffuses to other adjacent battery cells when thermal runaway occurs, and the problem of low safety performance still exists.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can prevent electric core, battery module and battery package of thermal runaway diffusion effectively.

An object of the utility model is to provide an electric installation, it supplies power through foretell electric core or battery package or battery module. Thus, it also has an advantage of high safety performance.

An object of the utility model is also to provide an equipment of preparation electricity core, it is used for making the higher electric core of above-mentioned security performance.

The embodiment of the utility model is realized like this:

in a first aspect, the utility model provides an electric core, include:

the explosion-proof device comprises a shell, a shell and a cover, wherein the shell is provided with a positive pole and a negative pole, and one side of the shell, which is not provided with the positive pole and the negative pole, in the circumferential direction is provided with an explosion-proof opening;

the winding core is arranged in the shell and is provided with a positive tab and a negative tab, the positive tab is electrically connected with the positive pole column, and the negative tab is electrically connected with the negative pole column;

the explosion-proof valve sets up in explosion-proof mouth department, and the explosion-proof valve includes explosion-proof piece and supplementary piece that splits, and supplementary piece that splits is used for supplementary explosion-proof piece when the explosion-proof piece receives the impact force along the pressure release direction and breaks, still is used for preventing the explosion-proof piece to break along the opposite direction of pressure release direction.

In an alternative embodiment, the auxiliary cracking piece is a groove formed in the explosion-proof piece, the groove is provided with a groove bottom and two groove walls oppositely arranged on two sides of the groove bottom, one end, far away from the groove bottom, of each groove wall forms a notch opposite to the groove bottom, and the groove bottom and the notches are arranged at intervals along the pressure relief direction.

In an alternative embodiment, the vertical distance from the notch to the bottom of the groove is the depth of the groove, and the depth of the groove is smaller than the thickness of the explosion-proof sheet in the pressure relief direction.

In an alternative embodiment, the number of the grooves is one or more, the shape of the groove is a straight line or an arc, and when the number of the grooves is more, at least two grooves intersect or are tangent.

In an optional embodiment, the explosion-proof valve further comprises a protective sheet covered outside the explosion-proof sheet, the protective sheet is provided with one or more discharge holes, and the discharge holes are used for discharging the molten substances discharged from the explosion-proof sheet; or the weak part is arranged on the protective sheet and is used for cracking under the impact of the molten substance discharged from the explosion-proof sheet to release the pressure.

In an optional embodiment, the auxiliary rupture member includes a protection plate and a sharp part, the protection plate covers the end of the explosion-proof plate close to the explosion-proof side, the protection plate is used for preventing the explosion-proof plate from being ruptured along the opposite direction of the pressure relief direction, the sharp part is located on the side of the protection plate close to the explosion-proof plate, and when the explosion-proof plate moves towards the protection plate under the impact force of the thermal runaway of the battery cell, the sharp part is used for puncturing the explosion-proof plate.

In an optional embodiment, one or more drain holes are formed in the protective sheet and used for draining the molten substances leaked from the explosion-proof sheet; or the weak part is arranged on the protective sheet and is used for cracking under the impact of the molten substance discharged from the explosion-proof sheet to release the pressure.

In an optional embodiment, the explosion-proof sheet is raised relative to the inner surface of the wall of the shell provided with the explosion-proof opening, the protection sheet and the explosion-proof sheet are arranged at intervals, a cavity is formed between the protection sheet and the explosion-proof sheet, and the outer surface of the protection sheet is flush with the outer surface of the wall of the shell provided with the explosion-proof opening.

In an alternative embodiment, the rupture disc is a metal or plastic sheet having a lower strength than the housing;

and/or the presence of a gas in the gas,

the thickness of the explosion-proof sheet is smaller than that of the shell wall of the shell along the pressure relief direction.

In an alternative embodiment, the positive pole column and the negative pole column are both arranged on a first side of the shell, and the explosion-proof opening is formed in a second side, which is away from the first side, of the shell in the circumferential direction.

In a second aspect, the present invention provides a battery module, including:

a plurality of the cells of any of the preceding embodiments, the plurality of cells arranged in a stack.

In an optional embodiment, the battery module further comprises a protection plate arranged adjacent to the explosion-proof valves of the battery cells, and the protection plate is provided with a weak part at a position opposite to each explosion-proof valve, and the weak part can be cracked under the impact of molten substances discharged from the explosion-proof valves;

alternatively, the first and second electrodes may be,

the battery module still includes a plurality of guard plates that set up with a plurality of electric cores one-to-one, and every guard plate all sets up outside the explosion-proof valve of the electric core that corresponds, and every guard plate all has weak portion, and weak portion can split under the impact of the melting material that the explosion-proof valve that corresponds let out.

In an optional embodiment, the battery module further includes a housing, and the plurality of battery cells are stacked and disposed in the housing;

the shell comprises two end plates, and the two end plates are arranged at two ends of the stacking direction of the plurality of battery cells; or, the shell includes two end plates and two curb plates, and two end plates set up in the both ends that a plurality of electric cores piled up the direction, and two curb plate intervals set up between two end plates.

A third aspect of the present invention provides a battery pack, including:

a box body;

a plurality of battery modules of any of the preceding embodiments, the battery modules are disposed within the case.

In an alternative embodiment, the box body comprises a side frame and a bottom plate, a supporting step is arranged on the side frame, the battery module is supported on the supporting step, one end of the battery module, which is adjacent to the explosion-proof valve, is arranged at a distance from the bottom plate, and a cavity is formed between the end of the battery module and the bottom plate.

In an optional embodiment, each battery module comprises a protection plate arranged adjacent to the explosion-proof valve of the battery cell, and the position of the protection plate, which is opposite to each explosion-proof valve, is provided with a weak part, and the weak part can be cracked under the impact of a molten substance discharged by the explosion-proof valve;

a cavity is formed between the plurality of protection plates of the plurality of battery modules and the bottom plate.

In an alternative embodiment, the side frames and/or the base plate are provided with a drain opening, which communicates with the chamber.

In an alternative embodiment, the battery module includes a housing, and the housing includes two end plates disposed at two ends of the plurality of battery cells in the stacking direction; or the shell comprises two end plates and two side plates, the two end plates are arranged at two ends of the stacking direction of the plurality of battery cores, and the two side plates are arranged between the two end plates at intervals;

two opposite frame bodies in the side frame are respectively provided with a supporting step, and two end plates are respectively supported on the two supporting steps; and/or two opposite frame bodies in the side frames are respectively provided with a supporting step, and the two side plates are respectively supported on the two supporting steps.

In a fourth aspect, the present invention provides an electric device, including:

an electricity utilization mechanism;

the battery cell of any of the preceding embodiments, wherein the battery cell is configured to supply power to a power utility; alternatively, the battery module of any one of the preceding embodiments, wherein the battery module is configured to supply power to an electricity consuming mechanism; alternatively, the battery pack of any one of the preceding embodiments, the battery pack being for powering an electrical utility.

In a fifth aspect, the utility model provides an equipment of preparation electricity core, include:

the system comprises a providing module, a control module and a control module, wherein the providing module is used for providing a shell, a winding core and an explosion-proof valve; the shell is provided with a positive pole column and a negative pole column, and an explosion-proof opening is formed in one side, which is not provided with the positive pole column and the negative pole column, of the periphery of the shell; the winding core is arranged in the shell and is provided with a positive electrode lug and a negative electrode lug; the explosion-proof valve comprises explosion-proof sheets and auxiliary cracking pieces which are arranged at intervals in the pressure relief direction;

the installation module is used for electrically connecting the positive tab with the positive post and electrically connecting the negative tab with the negative post, and is also used for arranging the explosion-proof valve at an explosion-proof port; the auxiliary cracking piece is used for assisting the explosion-proof piece to crack when the explosion-proof piece receives impact force along the pressure relief direction, and is also used for preventing the explosion-proof piece from cracking along the reverse direction of the pressure relief direction.

The embodiment of the utility model discloses an embodiment possesses following advantage or beneficial effect at least:

the embodiment of the utility model provides an electric core, which comprises a shell, a winding core and an explosion-proof valve; the shell is provided with a positive pole column and a negative pole column, and an explosion-proof opening is formed in one side, which is not provided with the positive pole column and the negative pole column, of the periphery of the shell; the winding core is arranged in the shell and is provided with a positive electrode lug and a negative electrode lug, the positive electrode lug is electrically connected with the positive electrode post, and the negative electrode lug is electrically connected with the negative electrode post; the explosion-proof valve is arranged at the explosion-proof port, the explosion-proof valve comprises an explosion-proof sheet and an auxiliary cracking piece, the auxiliary cracking piece is used for assisting the explosion-proof sheet to crack when the explosion-proof sheet receives impact force along the pressure relief direction, and the auxiliary cracking piece is also used for preventing the explosion-proof sheet from cracking along the opposite direction of the pressure relief direction. This electric core can realize the one-way explosion-proof of explosion-proof piece in the pressure release side through supplementary setting of piece that splits to make the explosion-proof piece be difficult for opening by accident under the external environment effect of casing, can also reduce the thermal runaway's between arbitrary adjacent electric core influence, prevent thermal runaway diffusion effectively, improve the security performance.

The embodiment of the utility model provides a battery module and battery package are still provided, it includes foretell electric core. Therefore, it also has an advantage of higher safety performance.

The embodiment of the utility model provides a power consumption device is still provided, and it supplies power through foretell electric core or battery package or battery module. Thus, it also has an advantage of high safety performance.

The embodiment of the utility model also provides an equipment of preparation electric core, it is used for making the higher electric core of above-mentioned security performance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required 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 pack according to an embodiment of the present invention;

fig. 2 is an exploded view of a battery pack according to an embodiment of the present invention;

fig. 3 is a schematic partial structure diagram of a battery pack according to an embodiment of the present invention;

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

fig. 5 is a schematic view of a partial structure of a battery module according to an embodiment of the present invention;

fig. 6 is a first schematic structural diagram of a casing of an electrical core according to an embodiment of the present invention;

fig. 7 is a first schematic cross-sectional view of a casing of a battery cell according to an embodiment of the present invention;

FIG. 8 is an enlarged view of a portion of FIG. 7 at I;

fig. 9 is a schematic view of a state of an explosion-proof sheet of a battery cell according to an embodiment of the present invention when an impact force is applied to the explosion-proof sheet;

fig. 10 is a second schematic structural diagram of a casing of a battery cell according to an embodiment of the present invention;

fig. 11 is a schematic cross-sectional view of a casing of a battery cell according to an embodiment of the present invention;

FIG. 12 is an enlarged view of a portion of FIG. 11 at II;

fig. 13 is a schematic structural diagram of a protection sheet of a battery cell according to an embodiment of the present invention.

The icon is 100-electric core; 101-a housing; 103-positive pole; 105-a negative pole post; 107-explosion-proof port; 109-an explosion-proof valve; 111-explosion-proof piece; 113-a groove; 115-groove bottom; 116-a slot wall; 117-notches; 119-a protective sheet; 121-mounting ring grooves; 123-drainage hole; 125-sharp portion; 127-a cavity; 200-a battery module; 201-a housing; 202-end plate; 203-side plate; 205-protective plate; 207-weaknesses; 300-a battery pack; 301-a box body; 303-side frames; 305-a backplane; 307-edge beam; 309-supporting step; 311-chamber.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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, as 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 invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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 or 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", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, 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 absolutely horizontal or hanging, but 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, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The positive post and the negative pole post interval of traditional electric core set up in one side of casing, and the explosion-proof mouth is seted up in the position of casing between positive post and negative pole post. By the arrangement, when the explosion-proof port is used for pressure relief, the discharged molten substances easily influence the positive pole column and the negative pole column, so that risks such as short circuit are caused. Therefore, in the prior art, the explosion-proof opening is arranged at a position away from the positive pole and the negative pole. However, the battery cell arranged in this way still cannot solve the problem that the battery cell diffuses to other adjacent battery cells when thermal runaway occurs, and the problem of low safety performance still exists.

In view of this, this embodiment provides an electric core, and it sets up explosion-proof valve to one-way explosion-proof structure for explosion-proof valve can only open when corresponding electric core thermal runaway, closes when adjacent or other electric core thermal runaway, thereby can prevent thermal runaway diffusion effectively, improves the security performance. The structure of the battery cell, the battery module including the battery cell, and the battery pack including the battery module will be described in detail below.

Fig. 1 is a schematic structural diagram of a battery pack 300 provided in this embodiment; fig. 2 is an exploded view of the battery pack 300 according to the present embodiment; fig. 3 is a schematic partial structure diagram of a battery pack 300 according to the present embodiment; fig. 4 is a schematic structural diagram of the battery module 200 according to the present embodiment. Referring to fig. 1 to 4, the present embodiment provides a battery pack 300, which includes a case 301 and a plurality of battery modules 200.

The case 301 is a frame of the battery pack 300 and is used to protect the safety of the battery module 200, so as to ensure that the battery module 200 can normally perform charging and discharging operations. The box 301 includes a side frame 303 and a bottom plate 305, the side frame 303 is a square frame structure surrounded by four side beams 307, and the bottom plate 305 is disposed at an end of the square frame structure, so that the whole box 301 is semi-open. The plurality of battery modules 200 are disposed inside the square frame structure, and the circumference of the battery modules 200 is surrounded by the side frames 303 to ensure the safety of the battery modules 200. Of course, in other embodiments, the number of the side frames 303 and the shape of the box 301 may be adjusted according to the requirement; meanwhile, a cooling mechanism may be disposed between the bottom plate 305 and the bottom of the battery module 200 to improve the heat dissipation effect of the battery module 200, which is not repeated in this embodiment.

In detail, fig. 5 is a schematic view of a partial structure of the battery module 200 provided in this embodiment. Referring to fig. 1 to 5, in the present embodiment, the number of the battery modules 200 is two, and the two battery modules 200 are arranged in parallel in the box 301 along the first direction (i.e., the ab direction in fig. 2). Meanwhile, each battery module 200 includes two sets of battery cells 100 arranged in parallel along the first direction, each set of battery cells 100 includes a plurality of battery cells 100 stacked along the second direction (i.e., the cd direction in fig. 2), the height direction of each battery cell 100 is the ef direction in fig. 3, the length direction of each battery cell 100 is the first direction, and the thickness direction of each battery cell 100 is the second direction, i.e., the ab, cd, and ef directions are perpendicular to each other. Through the arrangement, the box body 301 can accommodate more battery cells 100 in the volume range, and the energy density of the battery pack 300 can be ensured. Of course, in other embodiments, the number of the battery modules 200 included in the battery pack 300, the number of the battery cells 100 included in each battery module 200, and the number of the battery cells 100 included in each battery cell 100 component can be adjusted according to requirements; moreover, the battery cells 100 may also be directly connected in series or in parallel to form the battery pack 300, which is not described in this embodiment again.

In more detail, in the present embodiment, each battery module 200 includes two housings 201, and the number of the housings 201 matches the number of the battery cell 100 assemblies, so that a plurality of battery cells 100 of each battery cell 100 assembly can be stacked and disposed in the corresponding housing 201. Meanwhile, the case 201 includes two end plates 202 and two side plates 203. The housing 201 includes two end plates 202 and two side plates 203, where the two end plates 202 are disposed at two ends of a stacking direction of the multiple battery cells 100 of the corresponding battery cell 100 assembly, and the two side plates 203 are disposed between the two end plates 202 at intervals. Two end plates 202 and two curb plates 203 enclose into square tubular structure, can guarantee the security and the stability of electric core 100 subassembly circumference. Of course, in other embodiments, the housing 201 of the battery module 200 may also only include two end plates 202, and at this time, the plurality of battery cells 100 may be tightened by a tie, which is not limited in this embodiment.

Please refer to fig. 3 again, in the present embodiment, the side beams 307 at the opposite positions of the case 301 of the battery pack 300 and the side plates 203 of the battery module 200 are both substantially in an "L" -shaped hollow structure, the parallel portions of the L-shaped structure form supporting steps 309, the end plates 202 of the housing 101 of the battery module 200 are supported on the supporting steps 309, and after the battery module 200 is supported on the supporting steps 309, a cavity 311 is formed between the bottom of the battery module 200 and the bottom plate 305 of the battery pack 300. The arrangement of the supporting steps 309 is beneficial to ensuring the stability and reliability of the battery module 200, the efficiency and quality of charging and discharging operations can be ensured, and the existence of the cavity 311 is beneficial to heat dissipation of the battery module 200. Of course, in other embodiments, each edge beam 307 of the side frame 303 of the box 301 may be provided with an "L" -shaped hollow structure, so that each edge beam 307 can form one supporting step 309, and thus the end plate 202 and the side plate 203 of the battery module 200 can be located on the corresponding supporting step 309, so as to further improve the stability and safety of the battery module 200.

In addition, it should be noted that each battery module 200 is further provided with a CCS assembly, the CCS assembly includes a harness isolation board, an FPC component and a connection bar, the harness isolation board is supported on the housing 201 or on the end of the battery cell 100, the connection bar is used for connecting the battery cells 100 in series or in parallel, each battery cell 100 assembly is correspondingly provided with a PFC component, and the PFC component is electrically connected with a plurality of connection bars of each battery cell 100 assembly and supported on the harness isolation board. Parameters such as temperature and pressure of the battery cell 100 can be collected through the CCS assembly to ensure normal operation of charging and discharging operations of the battery pack 300.

Fig. 6 is a first schematic structural diagram of the casing 101 of the battery cell 100 provided in this embodiment; fig. 7 is a first schematic cross-sectional view of a casing 101 of the battery cell 100 provided in this embodiment; fig. 8 is a partial enlarged view at I of fig. 7. Referring to fig. 6 to 9, each of the battery cells 100 includes a casing 101, a winding core (not shown), and an explosion-proof valve 109.

The case 101 has a square structure, and the case 101 is provided with a positive post 103 and a negative post 105. The roll core is arranged in the shell 101, and the roll core is formed by winding or laminating a positive plate, a negative plate and a diaphragm, a positive lug is welded on the positive plate, a negative lug is welded on the negative plate, the positive lug is electrically connected with the positive post 103, and the negative lug is electrically connected with the negative post 105, so that the normal charging and discharging operation of the battery cell 100 can be ensured. Certainly, the casing 101 is further provided with an electrolyte to ensure normal charging and discharging, and the details are not repeated herein. In addition, in this embodiment, an explosion-proof port 107 is further formed in the end surface of the casing 101, and in order to separate the terminal of the battery cell 100 from the explosion-proof port 107, so as to reduce the influence on the terminal of the battery cell 100 when the explosion-proof port 107 is depressurized, thereby implementing thermoelectric separation, in this embodiment, the positive pole post 103 and the negative pole post 105 of the casing 101 are both disposed at one end of the battery cell 100 in the height direction, and the explosion-proof port 107 is formed at the other end of the battery cell 100 in the height direction. With such an arrangement, the influence of the explosion vent 107 on the pole can be sufficiently reduced, and the occurrence of pole short circuit caused by the molten material ejected from the explosion vent 107 can be effectively reduced or prevented.

Certainly, in other embodiments, the positive post 103 and the negative post 105 are not necessarily disposed on the same side, the positive post 103 and the negative post 105 may be disposed on two sides of the battery cell 100 in the width direction, and the explosion-proof opening 107 may be disposed on one side of the width direction, so as to ensure that the explosion-proof opening 107 is located on one side of the casing 101, where the positive post 103 and the negative post 105 are not disposed in the circumferential direction, which is not limited in this embodiment.

Referring to fig. 6 to 7 again, in the present embodiment, the explosion-proof valve 109 is disposed at the explosion-proof opening 107, and since the explosion-proof valve 109 is located at the bottom of the electrical core 100 in the height direction, the pressure releasing direction of the explosion-proof valve 109 can be understood as the ef direction in fig. 2 (since the direction during pressure releasing is not necessarily fixed, ef represents only one general flow direction of the molten material during pressure releasing, and does not mean that the pressure releasing direction cannot deviate from the ef direction), and the opposite direction of the pressure releasing direction is the fe direction. Specifically, the explosion-proof valve 109 includes an explosion-proof sheet 111 and an auxiliary rupture member. The explosion-proof sheet 111 is of a sheet structure and is matched with the shape of the explosion-proof opening 107, so that the explosion-proof opening 107 can be well plugged, and the safety of the battery cell 100 in normal operation is ensured. The auxiliary rupture member is used for assisting the rupture of the rupture disk 111 when the rupture disk 111 receives an impact force in a pressure relief direction, and is also used for preventing the rupture disk 111 from rupturing in a direction opposite to the pressure relief direction. This means that the function of the rupture assisting member is two, one is to assist the rupture of the rupture disk 111 in the pressure relief direction when the battery cell 100 is thermally runaway, and the other is to prevent other acting force from rupturing the rupture disk 111 when the battery cell 100 is not thermally runaway. That is, this electric core 100 can realize through supplementary setting of splitting piece that explosion-proof piece 111 is one-way explosion-proof in the pressure release side to make explosion-proof piece 111 be difficult for opening by accident under the outer environment effect of casing 101, can also reduce the thermal runaway's between arbitrary adjacent electric core 100 influence, prevent thermal runaway diffusion effectively, improve the security performance.

Fig. 9 is a schematic diagram of a state of the explosion-proof sheet 111 of the battery cell 100 provided in this embodiment when an impact force is applied. Referring to fig. 7 to 9, in the present embodiment, the auxiliary rupture member may be a structure integrally formed with the rupture disk 111, or may be an auxiliary structure disposed on the rupture disk 111, for example, the auxiliary rupture member may be a groove 113 formed on the rupture disk 111. The groove 113 is a rectangular long groove, the groove 113 is provided with a groove bottom 115 and two groove walls 116 oppositely arranged on two sides of the groove bottom 115, one end, far away from the groove bottom 115, of each of the two groove walls 116 forms a notch 117 opposite to the groove bottom 115, and the groove bottom 115 and the notches 117 are arranged at intervals along the pressure relief direction, so that the groove bottom 115 is arranged closer to the poles relative to the notches 117.

As shown in fig. 9, with this arrangement, when the explosion-proof plate 111 receives an impact force in the pressure relief direction, the two opposing groove walls 116 move away from each other, and at this time, the groove bottom 115 becomes a weak portion, so that the position where the explosion-proof plate 111 contacts the groove bottom 115 is easily broken by the impact force. That is, when electric core 100 thermal runaway, through the setting of recess 113 for explosion-proof piece 111 is changeed and is split under thermal runaway's impact force, in order to carry out the pressure release operation. Similarly, when the explosion-proof plate 111 receives an impact force in the opposite direction to the pressure relief direction, the notch 117 of the groove 113 is located at the upstream of the impact force, and the impact force is applied first, so that the two opposite groove walls 116 move close to each other and abut against each other, thereby preventing the explosion-proof plate 111 from being broken. That is, when electric core 100 does not have thermal runaway, if adjacent or other electric core 100 appear thermal runaway, the impact force is difficult for transmitting to explosion-proof piece 111, and explosion-proof piece 111 is difficult for breaking to can realize one-way explosion-proof purpose, can prevent thermal runaway diffusion effectively, improve battery module 200 and battery package 300's security performance.

It should be noted that, in this embodiment, the vertical distance from the notch 117 of the groove 113 to the groove bottom 115 is the depth of the groove 113, and the depth of the groove 113 is smaller than the thickness of the explosion-proof sheet 111 in the pressure relief direction. The reasonable degree of depth that sets up recess 113 can guarantee that electric core 100 normally works, can guarantee when thermal runaway again that explosion-proof piece 111 can carry out the pressure release operation.

Optionally, in this embodiment, the number of the grooves 113 is one or more. Meanwhile, the shape of the groove 113 is linear or arc. And when the number of grooves 113 is plural, at least two grooves 113 intersect or are tangent. There are two crossing or tangent recesses 113 for there is the nodical between the recess 113, and the nodical can guide the fuse-element after explosion-proof piece 111 breaks to flow to the nodical position concentratedly, can reduce the problem of splashing and appear, thereby can further reduce the influence to other electric cores 100, further improve battery module 200 and battery package 300's security.

Specifically, referring to fig. 6 again, in the present embodiment, the number of the grooves 113 is two, and both the grooves 113 extend in an arc shape, and the two grooves 113 are tangent to each other and substantially form an "X" shape. With this arrangement, the molten material after the rupture of the rupture disk 111 can be guided to flow intensively to the intersection point position, and the occurrence of the splash problem can be reduced. Of course, in other embodiments, the shape of the groove 113 may also be linear, and the number of the grooves 113 may also be adjusted according to requirements, which is not limited in this embodiment.

Further optionally, in this embodiment, the explosion-proof valve 109 further includes a protection plate 119 covering the explosion-proof plate 111, the protection plate 119 is located on a side of the explosion-proof plate 111 away from the pole, the protection plate 119 is in a disc shape, an installation ring groove 121 is disposed at the explosion-proof opening 107, and the protection plate 119 is accommodated in the installation ring groove 121. In this embodiment, a protective sheet 119 is used to provide protection and barrier. Meanwhile, in order to ensure that the rupture disk 111 can perform normal pressure relief operation after rupture, one or more drain holes 123 may be formed in the position of the protection disk 119 opposite to the rupture disk 111, and the drain holes 123 are used for draining the molten material discharged from the rupture disk 111. Alternatively, the weak portion 207 may be provided at a position where the protection sheet 119 faces the explosion-proof sheet 111, the weak portion 207 may be a position where the thickness is reduced, and the weak portion 207 may be opened to release the pressure by the impact of the molten material released from the explosion-proof sheet 111. Through the arrangement of the protection plate 119, when the battery cell 100 is out of control due to heat, the molten substance sprayed out after the explosion-proof plate 111 is broken can flow out after being blocked by the protection plate 119, the impact force is greatly weakened, so that the probability of flowing to the positions of the explosion-proof valves 109 of other battery cells 100 is reduced, the influence on other battery cells 100 can be reduced, when the battery cell 100 is not out of control due to heat, the molten substance flowing out due to heat of other battery cells 100 can be difficult to move to the explosion-proof plate 111 under the blocking of the protection plate 119, therefore, a certain blocking effect can be provided, the spreading of the heat out due to heat out of the battery cells 100 can be further prevented, and the safety of the battery module 200 and the battery pack 300 can be ensured.

In this embodiment, since the explosion-proof plate 111 needs to be cracked for pressure relief, the material of the explosion-proof plate 111 may be selected to be a material having lower strength than that of the housing 101, for example, when the material of the housing 101 is aluminum, the material of the explosion-proof plate 111 may be selected to be a plastic material or a metal material, such as a metal sheet or a plastic sheet, having lower strength than that of the aluminum. Of course, the same material as the casing 101 may be selected, for example, both the materials may be selected to be aluminum, and at this time, the thickness of the explosion-proof sheet 111 may be set to be thinner than the wall of the casing 101, so as to facilitate the rupture when the battery cell 100 is thermally runaway. Meanwhile, the connection mode of the explosion-proof sheet 111 and the housing 101 may be selected from bonding, fastening, welding, etc., and the stability after connection can be ensured, which is not limited in this embodiment.

Similarly, since the protection sheet 119 needs to provide protection and blocking functions, in the embodiment, the strength of the protection sheet 119 may be selected to be relatively high, for example, it may be selected to be made of an aluminum material the same as the housing 101 or other metal material with slightly higher strength, or may be selected to be made of a plastic material, for example, PET material, which can provide effective protection and blocking functions, which is not limited in this embodiment.

Fig. 10 is a second schematic structural diagram of the casing 101 of the battery cell 100 provided in this embodiment; fig. 11 is a second schematic cross-sectional view of the casing 101 of the battery cell 100 provided in this embodiment; FIG. 12 is an enlarged view of a portion of FIG. 11 at II; fig. 13 is a schematic structural diagram of a protection sheet 119 of the battery cell 100 provided in this embodiment. Referring to fig. 10 to 12, in the present embodiment, another auxiliary rupture member is further provided, and the auxiliary rupture member is not directly disposed on the explosion-proof plate 111, but is disposed at an interval from the explosion-proof plate 111 in the pressure releasing direction, and may be formed by the protection plate 119 and the sharp portion 125 disposed on the protection plate 119.

In detail, the protection sheet 119 is made of the same material, structure and position as those of the previous embodiment, and covers one end of the explosion-proof sheet 111 close to the explosion-proof side, the protection sheet 119 is used for preventing the explosion-proof sheet 111 from breaking in the opposite direction of the pressure relief direction, and the protection sheet 119 may also be provided with a vent hole 123 or a weak portion 207 to assist the pressure relief. The sharp part 125 is located on a side of the protection plate 119 close to the explosion-proof plate 111, and when the explosion-proof plate 111 moves towards the protection plate 119 under the impact force of the thermal runaway of the battery cell 100, the sharp part 125 is used for puncturing the explosion-proof plate 111.

That is, when the explosion-proof plate 111 receives an impact force in the pressure release direction, the explosion-proof plate 111 moves toward the protection plate 119 by the impact force, and when the local part of the explosion-proof plate 111 moves to the position of the sharp part 125, the sharp part 125 can pierce the explosion-proof plate 111, and at this time, the explosion-proof plate 111 can perform the pressure release operation. The decompressed molten material can be discharged through the discharge hole 123, and the impact force of the molten material blocked by the protection sheet 119 is weakened, so that the probability of flowing to other battery cells 100 can be reduced, and thermal runaway diffusion can be reduced. Moreover, by the arrangement of the protection sheet 119, impact force in the reverse direction of the pressure relief direction can be prevented from acting on the explosion-proof sheet 111 to a certain extent, so that molten substances discharged when adjacent battery cells 100 or other battery cells 100 are out of control due to heat can be prevented from reaching the explosion-proof sheet 111, reverse rupture of the explosion-proof sheet 111 can be reduced, the explosion-proof sheet 111 can be guaranteed to be only subjected to one-way pressure relief in the pressure relief direction, and therefore diffusion of the out of control due to heat can be further slowed down or prevented, and safety performance of the battery module 200 and the battery pack 300 is improved.

In the present embodiment, the pointed portion 125 has a long strip shape, and the pointed portion 125 has a triangular pyramidal shape with the pointed end facing the explosion-proof sheet 111. Meanwhile, six drain holes 123 are formed in the protection sheet 119, the six drain holes 123 are arranged in three rows and two columns, and the sharp part 125 is located between the two rows of drain holes 123 and approximately located at the center of the whole protection sheet 119 so as to be opposite to the center of the explosion-proof sheet 111, so that the explosion-proof sheet 111 is pierced when the battery cell 100 is out of thermal control. Of course, in other embodiments, the sharp part 125 may also be in a needle-like, rod-like or other sharp-like structure, and the number and arrangement of the drainage holes 123 may also be adjusted according to the requirement, which is not limited in this embodiment.

It should be noted that, no matter the auxiliary rupture member is provided as the groove 113, or the auxiliary rupture member is provided as an integrated structure of the protection plate 119 and the sharp part 125, in this embodiment, the explosion-proof plate 111 may be provided as a protrusion relative to the inner surface of the wall of the shell 101 where the explosion-proof opening 107 is provided, while the protection plate 119 and the explosion-proof plate 111 are provided at an interval, a cavity 127 is formed therebetween, and the outer surface of the protection plate 119 is flush with the outer surface of the wall of the shell 101 where the explosion-proof opening 107 is provided. On the one hand, the explosion-proof piece 111 is inwards protruded, so that a cavity 127 can be formed between the explosion-proof piece 111 and the protection piece 119, a pressure relief space can be reserved in the cavity 127, the flow speed of molten substances after pressure relief can be reduced, and the probability and risk of flowing to other battery cores 100 are reduced, on the other hand, the outer surface of the protection piece 119 is flush with the outer surface of the shell wall, the damage of external sundries or foreign matters to the explosion-proof piece 111 can be reduced, the probability of accidental damage is reduced, the safety of the battery core 100 is further improved, and the safety of the battery module 200 and the safety of the battery pack 300 are improved.

In addition, it should be further noted that, in this embodiment, two types of auxiliary rupture pieces may also be used in an overlapping manner, for example, the groove 113 may be disposed on one side of the explosion-proof sheet 111 close to the guard sheet 119, or the sharp portion 125 may be disposed on one side of the guard sheet 119 close to the explosion-proof sheet 111 at the same time, and the sharp end of the sharp portion 125 faces the groove 113, so that when the battery cell 100 is out of control due to heat, the explosion-proof sheet 111 is more likely to rupture, which is not limited in this embodiment.

Referring to fig. 5 again, in the present embodiment, the battery module 200 further includes a protection plate 205 disposed adjacent to the explosion-proof valve 109 of the battery cell 100. The shield plate 205 has a weak portion 207 at a position opposite to each explosion-proof valve 109, the weak portion 207 being a portion formed with a reduced thickness, the weak portion 207 being capable of being ruptured by the impact of the molten material discharged from the explosion-proof valve 109. Since the protection plate 205 is disposed adjacent to the explosion-proof valve 109 of the battery cell 100, the protection plate 205 is located at the lower end of the entire battery module 200, near the bottom plate 305 of the case 301 of the battery pack 300. Therefore, when the battery cell 100 is thermally out of control, the molten substance can burst through the explosion-proof sheet 111 and the weak portion 207 of the protection plate 205 and be ejected, and at this time, the ejected molten substance can move towards the bottom plate 305 of the battery pack 300 and bounce back to the lower surface of the protection plate 205 after striking the bottom plate 305, so as to reduce the probability of moving to the position of the explosion-proof valve 109 of another battery cell 100. At this time, since the entire explosion-proof valve 109 has a one-way explosion-proof function of opening in one way, the explosion-proof valve 109 can also effectively prevent the rebound material from affecting other nearby battery cells 100. That is, the provision of the protection plate 205 can provide a double one-way explosion-proof function in cooperation with the explosion-proof valve 109, further preventing thermal runaway from spreading and spreading, and improving the safety of the battery module 200 and the battery pack 300. In addition, through the arrangement of the protection plate 205, the probability that the molten material flows to the large surface and other surfaces of the battery cell 100 after being sprayed is reduced, so that the large surface structure of the battery cell 100 can be protected, and the safety of the battery cell 100 itself is further improved.

In addition, since there is a gap between the bottom of the battery module 200 and the bottom plate 305 of the case 301 of the battery pack 300, the cavity 311 between the battery module 200 and the bottom plate 305 of the battery pack 300 is formed by the plurality of protection plates 205 of the plurality of battery modules 200 and the bottom plate 305 of the battery pack 300. The cavity 311 is formed as a space for storing or temporarily storing the molten material and also as a space for buffering the molten material, so that the risk that the molten material spreads to the explosion-proof valves 109 of other battery cells 100 can be further reduced, and the safety of the battery module 200 and the battery pack 300 can be improved.

Of course, in order to facilitate the discharge of the molten material in the chamber 311, a drain port (not shown) may be provided on the side frame 303 and/or the bottom plate 305 as required, the drain port is communicated with the chamber 311, and a valve can be provided at the drain port. When molten materials need to be drained, the valve is opened, and when the molten materials do not need to be drained, the valve is closed.

In the embodiment, since the protection plate 205 is located at the bottom of the battery module 200, the protection plate 205 may be made of a refractory material, such as metal, alloy, ceramic, or mica. The present embodiment is specifically selected to be a mica board to provide fire and high temperature resistance. Meanwhile, because the protection plate 205 is located at the bottom of the battery module 200, the protection plate 205 may also serve as a plate body for supporting the battery cell 100, so that the protection plate 205 is set as a mica plate with certain strength, the safety and stability of the battery cell 100 can be further ensured, and the safety and stability of the battery pack 300 of the battery module 200 are further improved.

It should be further noted that, in this embodiment, two battery cells 100 of each battery module 200 share one protection plate 205, but in other embodiments, each battery cell 100 may be correspondingly provided with one protection plate 205, the protection plate 205 may be a plate structure covering the explosion-proof valve 109, or a cover structure covering one side of the battery cell 100 where the explosion-proof valve 109 is provided, and each protection plate 205 has a weak portion 207, and the weak portion 207 may be cracked by the impact of the molten material leaked from the corresponding explosion-proof valve 109, which is not limited in this embodiment.

The embodiment of the utility model provides an electric installation is still provided, it includes power consumption mechanism to and foretell electricity core 100, battery module 200 or battery package 300. The electricity utilization mechanism can be selected from a vehicle, a ship, a spacecraft and the like. The electricity utilization mechanism can supply electricity through the battery cells 100, the battery pack 300 or the battery module 200. Thus, it also has an advantage of high safety performance.

The embodiment of the utility model also provides an equipment for preparing the battery cell 100, which comprises a providing module and an installing module; the providing module is used for providing the shell 101, the winding core and the explosion-proof valve 109; the shell 101 is provided with a positive pole post 103 and a negative pole post 105, and an explosion-proof port 107 is formed in one side of the shell 101, which is not provided with the positive pole post 103 and the negative pole post 105, in the circumferential direction; the winding core is arranged in the shell 101 and is provided with a positive electrode lug and a negative electrode lug; the explosion-proof valve 109 includes an explosion-proof piece 111 and an auxiliary rupture member which are arranged at an interval in the pressure release direction; the mounting module is used for electrically connecting the positive tab with the positive post 103 and electrically connecting the negative tab with the negative post 105, and is also used for arranging the explosion-proof valve 109 at the explosion-proof port 107; the auxiliary rupture member is used for assisting the rupture of the rupture disk 111 when the rupture disk 111 receives impact force along the pressure relief direction, and is also used for preventing the rupture disk 111 from rupturing along the direction opposite to the pressure relief direction. The apparatus can manufacture the battery module 200 having high safety.

The following describes in detail the mounting process, the working principle and the beneficial effects of the battery pack 300 according to the embodiment of the present invention, by taking the structure shown in fig. 1 to fig. 8 as an example:

in the mounting operation of the battery pack 300, the assembled battery module 200 may be supported on the bottom plate 305 of the case 301 of the battery pack 300. When the battery module 200 is assembled, the end plate 202 and the side plate 203 may be assembled into the housing 201, and the assembled battery cells 100 may be stacked in the housing 201. And when the equipment of electric core 100 sets up, can set up positive post 103 and negative pole post 105 in one side of electric core 100 casing 101, set up explosion-proof mouth 107 in the opposite side of electric core 100 casing 101, set up the book core in electric core 100 casing 101, and be connected the positive ear of book core with positive post 103 electricity, the negative ear of book core is connected with negative pole post 105 electricity, set up explosion-proof valve 109 in explosion-proof mouth 107 department, make notch 117 of explosion-proof piece 111's recess 113 deviate from positive post 103 and negative pole post 105, and towards protection plate 119, make the surface of protection plate 119 flush with the surface of the conchal wall of casing 101 can.

In the above-mentioned in-process, this electricity core 100 can realize through setting up of recess 113 that explosion-proof piece 111 is the ascending one-way explosion-proof in the pressure release direction to make explosion-proof piece 111 be difficult for opening by accident under the external environment effect of casing 101, can also reduce the thermal runaway's between arbitrary adjacent electric core 100 influence, prevent thermal runaway diffusion effectively, improve the security performance.

To sum up, the embodiment of the present invention provides an electrical core 100, a battery module 200 and a battery pack 300 capable of effectively preventing thermal runaway diffusion. An embodiment of the utility model provides an electric installation, it supplies power through foretell electric core 100 or battery package 300 or battery module 200. Thus, it also has an advantage of high safety performance. The embodiment of the utility model provides an equipment of preparation electricity core 100 is still provided, and it is used for making the higher electric core 100 of above-mentioned security performance.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 (20)

1. An electrical core, comprising:

the explosion-proof device comprises a shell, a shell and a cover, wherein the shell is provided with a positive pole column and a negative pole column, and one side of the shell, which is not provided with the positive pole column and the negative pole column, is provided with an explosion-proof opening in the circumferential direction;

the winding core is arranged in the shell and provided with a positive electrode lug and a negative electrode lug, the positive electrode lug is electrically connected with the positive electrode post, and the negative electrode lug is electrically connected with the negative electrode post;

explosion-proof valve, set up in explosion-proof mouth department, explosion-proof valve includes the explosion-proof piece and the supplementary piece that splits that set up at the interval in the pressure release direction, supplementary piece that splits is used for the explosion-proof piece receives the edge supplementary during the impact force of pressure release direction the explosion-proof piece breaks, still is used for preventing the explosion-proof piece is followed the opposite direction of pressure release direction breaks.

2. The cell of claim 1, wherein:

the supplementary piece that splits is for seting up in recess on the explosion-proof piece, the recess has tank bottom and two cell walls that set up in the tank bottom both sides relatively, two the cell wall is kept away from the one end of tank bottom form with the notch that the tank bottom is relative, and follow the pressure release direction, the tank bottom with the notch interval sets up.

3. The cell of claim 2, wherein:

the vertical distance from the notch to the groove bottom is the depth of the groove, and the depth of the groove is smaller than the thickness of the explosion-proof sheet in the pressure relief direction.

4. The cell of claim 2, wherein:

the number of the grooves is one or more, the grooves are linear or arc-shaped, and when the number of the grooves is more, at least two grooves are intersected or tangent.

5. The electrical core of claim 2, wherein:

the explosion-proof valve also comprises a protective sheet covered outside the explosion-proof sheet, the protective sheet is provided with one or more drain holes, and the drain holes are used for draining the molten substances discharged from the explosion-proof sheet; or the protection sheet is provided with a weak part which is used for cracking under the impact of a molten substance leaked from the explosion-proof sheet to release pressure.

6. The electrical core of claim 1, wherein:

the supplementary piece that splits includes protection plate and sharp-pointed portion, the protection plate lid is located the explosion-proof piece is close to the one end of explosion-proof side, the protection plate is used for preventing the explosion-proof piece breaks along the pressure release direction opposite direction, sharp-pointed portion is located the protection plate is close to one side of explosion-proof piece is worked as the explosion-proof piece is in under electric core thermal runaway's the impact force to during the protection plate motion, sharp-pointed portion is used for puncturing the explosion-proof piece.

7. The cell of claim 6, wherein:

one or more drain holes are formed in the protective sheet and used for draining the molten substances leaked from the explosion-proof sheet; or the protection sheet is provided with a weak part which is used for cracking under the impact of a molten substance leaked from the explosion-proof sheet to release pressure.

8. The cell of any of claims 5 to 7, wherein:

the explosion-proof sheet is raised relative to the inner surface of the shell wall of the explosion-proof opening formed in the shell, the protection sheet and the explosion-proof sheet are arranged at intervals, a cavity is formed between the protection sheet and the explosion-proof sheet, and the outer surface of the protection sheet is flush with the outer surface of the shell wall of the explosion-proof opening formed in the shell.

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

the explosion-proof sheet is a metal sheet or a plastic sheet with the strength lower than that of the shell;

and/or the presence of a gas in the gas,

the thickness of the explosion-proof sheet is smaller than that of the shell wall of the shell along the pressure relief direction.

10. The cell of any of claims 1 to 7, wherein:

the positive pole post with the negative pole post all set up in the first side of casing, explosion-proof mouthful seted up in casing circumference deviates from the second side of first side.

11. A battery module, comprising:

a plurality of the cells of any of claims 1-10, a plurality of the cells being arranged in a stack.

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

the battery module further comprises a protection plate arranged adjacent to the explosion-proof valves of the battery cell, and the protection plate is provided with a weak part at a position opposite to each explosion-proof valve, and the weak part can be cracked under the impact of molten substances discharged by the explosion-proof valves;

alternatively, the first and second liquid crystal display panels may be,

the battery module still include with a plurality of the multiple guard plate that the electricity core one-to-one set up, every the guard plate all sets up in corresponding outside the explosion-proof valve of electricity core, and every the guard plate all has weak part, weak part can be in the correspondence rupture under the impact of the molten material that the explosion-proof valve let out.

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

the battery module further comprises a shell, and a plurality of battery cells are stacked and arranged in the shell;

the shell comprises two end plates, and the two end plates are arranged at two ends of the stacking direction of the battery cells; or, the shell includes two end plates and two curb plates, two the end plate sets up in a plurality of the electric core piles up the both ends of direction, two the curb plate interval sets up in two between the end plate.

14. A battery pack, comprising:

a box body;

a plurality of the battery modules according to any one of claims 11 to 13, which are disposed in the case.

15. The battery pack according to claim 14, wherein:

the box includes side frame and bottom plate, be provided with the support step on the side frame, the battery module support in support the step, just the battery module be close to the one end of explosion-proof valve with the bottom plate interval sets up, and forms the cavity between the two.

16. The battery pack according to claim 15, wherein:

each battery module comprises a protection plate arranged adjacent to the explosion-proof valve of the battery core, and a weak part is arranged at the position, opposite to each explosion-proof valve, of the protection plate and can be cracked under the impact of a molten substance discharged by the explosion-proof valve;

the plurality of protection plates of the plurality of battery modules and the bottom plate together form the cavity.

17. The battery pack of claim 16, wherein:

and the side frame and/or the bottom plate are/is provided with a drain outlet which is communicated with the chamber.

18. The battery pack according to claim 15, wherein:

the battery module comprises a shell, wherein the shell comprises two end plates which are arranged at two ends of the stacking direction of the battery cores; or the shell comprises two end plates and two side plates, the two end plates are arranged at two ends of the stacking direction of the plurality of battery cells, and the two side plates are arranged between the two end plates at intervals;

the two opposite frame bodies in the side frames are respectively provided with the supporting steps, and the two end plates are respectively supported on the two supporting steps; and/or the two opposite frame bodies in the side frames are respectively provided with the supporting steps, and the two side plates are respectively supported on the two supporting steps.

19. An electric device, comprising:

an electricity utilization mechanism;

the electrical core of any of claims 1 to 10, configured to power the electricity utility; alternatively, the battery module according to any one of claims 11 to 13, which is used to supply power to the electricity consuming mechanism; alternatively, a battery pack as claimed in any one of claims 14 to 18 for powering the electricity consuming mechanism.

20. An apparatus for preparing a cell, comprising:

providing a module for providing a shell, a winding core and an explosion-proof valve; the shell is provided with a positive pole column and a negative pole column, and an explosion-proof opening is formed in one side of the shell, which is not provided with the positive pole column and the negative pole column, in the circumferential direction; the winding core is arranged in the shell and is provided with a positive electrode lug and a negative electrode lug; the explosion-proof valve comprises explosion-proof sheets and auxiliary cracking pieces which are arranged at intervals in the pressure relief direction;

the installation module is used for electrically connecting the positive tab with the positive post and electrically connecting the negative tab with the negative post, and the installation module is also used for arranging the explosion-proof valve at the explosion-proof port; the auxiliary cracking piece is used for assisting the explosion-proof piece to crack when the explosion-proof piece is subjected to impact force along the pressure release direction, and is also used for preventing the explosion-proof piece from cracking along the direction opposite to the pressure release direction.

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