CN219759868U - Soft package battery cell and battery module - Google Patents

Abstract

The utility model provides a soft package battery core and a battery module, comprising: the battery cell comprises a battery cell body and a packaging shell, wherein a cavity for accommodating the battery cell body is formed in the packaging shell, the packaging shell is made of fireproof heat-insulating materials, a notch part is formed in the packaging shell and is configured to be cracked when the air pressure in the cavity reaches a preset value. The soft package battery cell of this embodiment encapsulates the battery cell body through the encapsulation shell, because be equipped with nick portion on the encapsulation shell, consequently, the high temperature gas that the battery cell body produced can be directional the emission for the direction of soft package battery cell inflation pressure release has certainty. And the packaging shell has heat insulation and flame retardance, so that the risk of igniting adjacent soft package battery cells after the soft package battery cells are out of control is reduced, and the exacerbation of thermal runaway reaction can be effectively avoided.

Description

Soft package battery cell and battery module

Technical Field

The utility model relates to the technical field of batteries, in particular to a soft-package battery cell and a battery module.

Background

With the rapid development of new energy technology, the soft-package battery core is widely applied due to the advantages of high energy density, flexible design, high safety and the like. At present, the outside of the soft package battery core is generally coated by an aluminum plastic film, and in the process of charging and discharging the soft package battery core, an internal active substance of the soft package battery core reacts with electrolyte to increase the internal pressure of the soft package battery core, and the aluminum plastic film expands to cause expansion and break so as to release the internal pressure.

However, because the aluminum plastic film belongs to flexible materials, the expansion and pressure relief directions of the soft package battery cells are random, the heat spreading directions have uncertainty, and the adjacent soft package battery cells are easy to ignite.

Disclosure of Invention

The utility model aims at solving at least one of the technical problems in the prior art and provides a soft-package battery cell and a battery module.

To achieve the object of the present utility model, there is provided a soft battery cell comprising: the battery cell comprises a battery cell body and a packaging shell, wherein a cavity for accommodating the battery cell body is formed in the packaging shell, the packaging shell is made of fireproof heat-insulating materials, a notch part is formed in the packaging shell and is configured to be cracked when the air pressure in the cavity reaches a preset value.

The soft package battery core is characterized in that the packaging shell is provided with the opening, the opening is communicated with the cavity, and the opening and the notch part are positioned on different sides of the battery core body; the battery core body is provided with a plurality of electrode lugs, and each electrode lug extends out of the packaging shell through an opening.

The soft-package battery core further comprises a plurality of heat-resistant pieces arranged in the cavity, and each tab is clamped between two heat-resistant pieces.

The soft-package battery cell as described above, wherein the heat-resistant member is made of a deformable material.

The soft-package battery core is characterized in that the deformable material is high-temperature-resistant compressible foam, high-temperature-resistant rubber pad or high-temperature-resistant glue solidified substance.

The soft package battery core is characterized in that the side wall provided with the opening in the package shell is made of an insulating material, and the other side walls are made of metal materials.

The soft package battery cell as described above, wherein the package case includes: the shell and the cover body are in butt joint along the first direction and jointly enclose to form a cavity.

The soft-package battery core is characterized in that the cover body is of a flat plate structure; the shell comprises a substrate and a frame, the frame is connected with the peripheral edges of the substrate, and the frame, the substrate and the cover body are enclosed together to form a cavity.

The soft-package battery cell is characterized in that at least one notch is arranged on the frame, and the notch on the frame is U-shaped; the soft package battery core further comprises a fireproof plate, the fireproof plate is connected with the frame through a connecting part and seals the notch, and the notch part is formed in the area, corresponding to the notch, of the fireproof plate.

The soft package battery cell is characterized in that the number of the notches is one or more than two.

The soft package battery core is characterized in that the connecting part is a screw, adhesive or solder.

The soft-package battery cell comprises the battery cell body, the battery cell cover and the battery cell cover, and the battery cell cover is arranged on the battery cell cover.

The soft package battery cell comprises the battery cell body, the battery cell body is provided with the notch, the battery cell body is provided with the heat conducting piece, the notch is arranged on the inner surface of the battery cell body, and the heat conducting piece is tightly attached to the inner surface of the battery cell body and the inner surface of the packaging shell.

The soft package battery core is characterized in that the heat conduction piece is a heat conduction glue solidified substance or heat conduction silica gel.

As another technical scheme, the present utility model also provides a battery module, including: a plurality of soft package battery cores are provided by the utility model.

The battery module is characterized in that the fixing parts are arranged on the outer surface of the packaging shell of the soft package battery core in a protruding mode, the soft package battery cores are arranged in a first direction, and the fixing parts of any two adjacent soft package battery cores are connected.

The utility model has the following beneficial effects:

according to the soft-package battery cell and the battery module, the battery cell body is packaged through the packaging shell, and the protection performance of the soft-package battery cell is improved. Because the notch part is arranged on the packaging shell, high-temperature gas generated by the battery cell body can be discharged in a directional way, so that the expansion and pressure relief directions of the soft package battery cells are deterministic.

And the packaging shell not only has heat insulation and flame retardance, but also can effectively block flame and high-temperature gas after one soft package battery core is out of control when a plurality of soft package battery cores are applied to the battery pack, so that the risk of ignition is reduced. Therefore, the exacerbation of the thermal runaway reaction can be effectively avoided, and the thermal protection capability of the battery pack with the soft-pack battery cell is improved.

Drawings

Fig. 1 is a schematic perspective view of a battery module according to an embodiment of the present utility model;

fig. 2 is a schematic perspective view of a soft package battery cell according to an embodiment of the present utility model;

FIG. 3 is an exploded view of the soft pack cell of FIG. 2;

fig. 4 is a top view of the battery module shown in fig. 1;

fig. 5 is a sectional view of the battery module shown in fig. 4 in the A-A direction;

FIG. 6 is a partial enlarged view at B in FIG. 5;

fig. 7 is a partial enlarged view at C in fig. 5.

Reference numerals illustrate:

1000-battery module;

100-soft package battery core;

110-a cell body; 111-electrode lugs;

120-packaging the shell; 121-a housing; 1211-a substrate; 1212-frame; 1213-notch;

122-cover; 123-score; 124-fire protection plate; 125-a heat resistant member; 126-a heat conducting member; 1261-plates; 1262-arcuate plates; 127-cushioning member; 128-a fixing part; 1281-clamping holes; 1282-clamping columns.

Detailed Description

In order to enable those skilled in the art to better understand the technical scheme of the utility model, the soft package battery cell and the battery module provided by the utility model are described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of a battery module according to an embodiment of the present utility model. Referring to fig. 1, an embodiment of the utility model provides a battery module 1000, which is applied to a battery pack to provide electric energy for an electric device. The battery module 1000 includes a plurality of soft package battery cells 100, and the plurality of soft package battery cells 100 can be directly applied to a battery pack, or can be assembled into a whole in a serial, parallel or series-parallel manner and then applied to the battery pack.

Fig. 2 is a schematic perspective view of a soft package battery 100 according to an embodiment of the present utility model, and fig. 3 is an exploded schematic view of the soft package battery 100 shown in fig. 2. Referring to fig. 2 and 3, the embodiment of the utility model further provides a soft package battery cell 100, wherein the soft package battery cell 100 is a minimum unit for providing electric energy, the soft package battery cell 100 includes a battery cell body 110 and a package housing 120, a cavity for accommodating the battery cell body 110 is formed in the package housing 120, the package housing 120 is made of a fireproof and heat-insulating material, a notch portion 123 is formed on the package housing 120, and the notch portion 123 is configured to be ruptured when the air pressure in the cavity reaches a preset value.

In order to enable the cavity to be matched with the cell body 110, the package housing 120 may have a rectangular parallelepiped shape. The package housing 120 may be made of fireproof and heat-insulating materials such as mica, ceramic fiber, glass fiber, heat-absorbing phase-change material, etc., so that the package housing 120 has heat insulation, i.e. the package housing 120 can delay or prevent heat diffusion; and the encapsulation housing 120 has flame retardancy, i.e., the encapsulation housing 120 can delay or prevent the spread of flames.

In the working process of the soft package battery core 100, when the battery core body 110 is out of control, a large amount of high-temperature gas is generated, so that the internal pressure of the battery core body 110 is increased, the high-temperature gas breaks through an aluminum plastic film of the battery core body 110 and then is released into a cavity inside the package shell 120, the air pressure inside the cavity is rapidly increased, when the air pressure inside the cavity reaches a preset value, the package shell 120 is broken through the high-temperature gas along the notch 123, and the high-temperature gas is discharged to the outside of the package shell 120.

As can be seen from the above, the soft-packaged battery cell 100 of the embodiment encapsulates the battery cell body 110 through the encapsulation housing 120, so that the protection performance of the soft-packaged battery cell 100 is improved. Since the package housing 120 is provided with the notch 123, the high-temperature gas generated by the battery cell body 110 can be discharged in a directional manner, so that the expansion and decompression directions of the soft package battery cell 100 are deterministic. When the soft pack battery cell 100 is applied to a battery pack, the soft pack battery cell 100 may be arranged such that the scored portion 123 is located at the top of the package case 120, and the high temperature gas is discharged upward.

Moreover, when the plurality of soft package battery cells 100 are applied to the battery pack, one soft package battery cell 100 discharges high-temperature gas after thermal runaway, and the high-temperature gas is discharged outside the cavity and contacts with air to burn, because the package case 120 has heat insulation property and flame retardance, the package cases 120 of adjacent soft package battery cells 100 can effectively block flame and high-temperature gas, and the risk of ignition is reduced. In this way, the thermal runaway reaction can be effectively prevented from being aggravated, thereby improving the thermal protection capability of the battery pack having the soft pack battery cell 100.

Fig. 4 is a top view of the battery module 1000 shown in fig. 1, and fig. 5 is a cross-sectional view of the battery module 1000 shown in fig. 4 along the direction A-A. Specifically, with continued reference to fig. 2, 3, 4, and 5, the enclosure housing 120 may include a housing 121 and a cover 122, where the housing 121 and the cover 122 interface in a first direction and collectively enclose a cavity. Thus, the soft pack battery cell 100 is easily assembled and disassembled. It should be further noted that, for convenience of description, in the drawings of the embodiments of the present utility model, the directions of the X axis, the Y axis and the Z axis represent the thickness direction, the length direction and the height direction of the cell body 110, respectively.

The first direction may be, for example, a length direction (i.e., a Y-axis direction) of the cell body 110, or a height direction (i.e., a Z-axis direction) of the cell body 110. Alternatively, in the example shown in fig. 3, the first direction is specifically the thickness direction (i.e., the X-axis direction) of the cell body 110, so that the thickness of the package case 120 is small, and the cell body 110 is easily installed into the cavity. Hereinafter, the first direction is exemplified as a thickness direction of the cell body 110.

The case 121 and the cover 122 are covered with each other. The housing 121 includes a substrate 1211 and a frame 1212, the substrate 1211 is rectangular, and the frame 1212 is connected to the peripheral edge of the substrate 1211. In some cases, the structure of the cover 122 may be similar to that of the case 121, i.e., the cover 122 is a structure that is open on one side and hollow in the inside. Alternatively, as shown in fig. 3, in other cases, the cover 122 may be a flat plate structure, and the frame 1212, the substrate 1211 and the cover 122 together enclose a cavity. In an example in which the cover 122 is in a flat plate structure, the battery cell body 110 may be completely accommodated inside the case 121. The cell body 110 may be adhered to the inner surface of the housing 121 by adhesive, so that the cell body 110 is adhered and fixed in the cavity, and the mounting stability is high.

In the following, only the cover 122 is taken as an example of a flat plate structure, and after a person skilled in the art reads the following technical solutions, it is obvious that the cover 122 is a technical solution with an open side and a hollow interior, which will not be described herein.

In some embodiments, the package housing 120 is provided with an opening that communicates with the cavity, the opening and score 123 being located on different sides of the cell body 110. In other words, the opening and the score 123 are provided on different sidewalls of the package case 120.

The battery core body 110 has a plurality of tabs 111, at least one tab 111 is a positive tab, at least one tab 111 is a negative tab, and each tab 111 extends out of the package housing 120 from an opening, so as to facilitate electrical connection.

As shown in fig. 2 and 3, the number of the positive electrode tabs and the negative electrode tabs is one, and the positive electrode tabs and the negative electrode tabs are respectively led out from two sides of the battery cell body 110 along the Z-axis direction, two opposite sides of the frame 1212 are respectively provided with an opening, and the positive electrode tabs and the negative electrode tabs respectively extend out of the package housing 120 through the openings on the corresponding sides. Here, it can be understood that the positive electrode tab and the negative electrode tab may be led out from the same side of the battery core body 110 instead, at this time, a side edge of the frame 1212 opposite to the electrode tab 111 may be provided with an opening, and the positive electrode tab and the negative electrode tab both extend out of the cavity from the opening, or the side edge of the frame 1212 opposite to the electrode tab 111 may be provided with two openings, and the positive electrode tab and the negative electrode tab extend out of the package housing 120 through the opening respectively.

Of course, in other embodiments, the number of tabs 111 may be more than two. In this embodiment, the arrangement of the tabs 111 may be: each tab 111 is led out from different sides of the battery cell body 110; alternatively, all the tabs 111 are led out from the same side of the cell body 110; or, the electrode tabs 111 are led out from multiple sides of the battery cell body 110, and multiple electrode tabs 111 are led out from at least one side of the battery cell body 110. The number and positions of the openings may be reasonably designed according to the number and positions of the tabs 111, which is not illustrated herein.

In this embodiment, in the working process of the soft package battery core 100, the battery core body 110 is out of control to generate a large amount of high temperature gas, the high temperature gas rushes out of the package housing 120 and contacts with air outside the cavity to initiate combustion, and since the notch portion 123 and the opening are located on different sides of the battery core body 110, the notch portion 123 and the tab 111 are far apart, so that the discharged high temperature gas and flame are far away from the tab 111, and in this way, thermoelectric separation can be effectively realized, so as to effectively reduce the risk of the flame striking the tab 111, thereby being beneficial to ensuring the stability of the electrical connection of the tab 111.

In an alternative embodiment, the side wall of the package housing 120 with the opening may be made of an insulating material, and the remaining side wall may be made of a metal material, as described above, where the side wall with the opening is opposite to the tab 111. In other words, the sidewall of the opening is made of an insulating material. For example, in the example shown in fig. 3, the two opposite sides of the frame 1212 along the Z-axis direction are made of an insulating material (e.g., mica, silicone rubber, etc.), and the cover 122, the substrate 1211, and the remaining sides of the frame 1212 are made of a fireproof and heat-insulating metal material (e.g., aluminum alloy). Therefore, on one hand, the packaging shell 120 has higher structural strength and high stability, and on the other hand, compared with the soft package battery cell 100 packaged by the aluminum plastic film, the soft package battery cell 100 is easy to fix and arrange when the soft package battery cell 100 is applied in a battery package because the packaging shell 120 of the soft package battery cell 100 is made of hard materials. Moreover, the tab 111 is insulated from the side wall where the opening is located, so that the tab 111 extending from the opening is effectively prevented from being electrically connected with the side wall where the opening is located due to contact, and short circuit caused by conduction of the package housing 120 is avoided.

It should be noted that, when the two opposite sides of the frame 1212 along the Z-axis are made of silicone rubber, and the substrate 1211 and the rest of the sides of the frame 1212 are made of metal, the sides made of silicone rubber may be fixedly connected to the substrate 1211 and the rest of the sides of the frame 1212 by a hot-melt process. Alternatively, two opposite sides of the frame 1212 along the Z-axis direction may be engaged with the substrate 1211 and the rest of the frame 1212.

As a further alternative example, the soft pack battery cell 100 may further include heat-resistant members 125 disposed inside the cavity, the heat-resistant members 125 being provided with a plurality of heat-resistant members 125 and the number of the heat-resistant members 125 being even, each tab 111 being sandwiched between two heat-resistant members 125.

In the example shown in fig. 3, two sides of the battery core body 110 along the Z-axis direction respectively lead out a positive electrode tab and a negative electrode tab, four heat-resistant pieces 125 are correspondingly arranged, two of the four heat-resistant pieces 125 are positioned at one side of the battery core body 110 along the Z-axis direction and are tightly attached to two sides of the positive electrode tab, and the other two of the four heat-resistant pieces 125 are positioned at the other side of the battery core body 110 along the Z-axis direction and are tightly attached to two sides of the negative electrode tab.

By the design, each tab 111 is clamped between two heat-resistant pieces 125, and the heat-resistant pieces 125 can play a role in protecting the tab 111, so that high-temperature gas and flame generated when the battery cell body 110 is out of control are further avoided, the tab 111 is impacted by the flame, and the stability of electric connection of the tab 111 is further ensured.

It should be noted that, in the technical solution that at least one side of the battery core body 110 has a plurality of tabs 111 led out, each tab 111 located on the same side of the battery core body 110 may be located between two different heat-resistant members 125. Or, the plurality of tabs 111 on the same side of the battery cell body 110 may be located between the same two heat-resistant members 125, so that the two heat-resistant members 125 can clamp the plurality of tabs 111 on the same side of the battery cell body 110 together, the number of the heat-resistant members 125 is small, the assembly process of the heat-resistant members 125 is small, and the assembly difficulty of the soft package battery cell 100 is reduced.

In some embodiments, the heat resistant member 125 may be adhesively attached to the tab 111 by an adhesive. Alternatively, the heat-resistant member 125 on the side of the tab 111 close to the cover 122 may be bonded to the cover 122, and the heat-resistant member 125 on the side of the tab 111 away from the cover 122 may be bonded to the inner surface of the case 121. In this way, the heat-resistant member 125 is fixed in the cavity by adhesion, and the mounting is stable, so that the function of protecting the tab 111 can be reliably achieved.

In order to protect the tab 111 from flame, the heat-resistant member 125 may be made of fireproof and heat-insulating materials (e.g., mica, ceramic fiber, heat-absorbing phase-change materials). On the basis of this embodiment, the heat-resistant member 125 may be further designed to be made of a deformable material. For example, the heat resistant member 125 may be made of high temperature resistant compressible foam (e.g., silicon foam). Of course, in other embodiments, the high temperature resistant compressible foam may be replaced by a high temperature resistant rubber pad or a high temperature resistant silica gel glue or a high temperature resistant glue cured product. The heat-resistant member 125 has good heat-insulating and flame-retardant properties, and is elastic, and the heat-resistant member 125 is compressible to play a role in buffering protection, so as to prevent the tab 111 from being damaged due to excessive extrusion.

The notch 123 may be directly formed on the case 121. In some embodiments of the present utility model, as shown in fig. 3, a notch 1213 is disposed on the frame 1212, the notch 1213 is specifically located at the edge of the frame 1212 near the cover 122, and the edge of the frame 1212 near the cover 122 extends from the edge of the frame 1212 near the substrate 1211 to the edge of the frame 1212 near the substrate 1211, so that the notch 1213 is an open notch, and the notch 1213 is specifically a "U". The pouch cell 100 further includes a fireproof plate 124, the fireproof plate 124 is connected to the frame 1212 through a connection portion and seals the notch 1213, and the notch 123 is formed in a region of the fireproof plate 124 corresponding to the notch 1213.

The flame retardant panel 124 may be positioned outside the cavity to connect with an outer surface of the bezel 1212 facing the outside of the cavity. Referring to fig. 5 and 6, the fireproof plate 124 may also be located in the cavity to connect with the inner surface of the frame 1212 facing the interior of the cavity, so that the visual effect of the soft package battery 100 is better. Wherein fig. 6 is a partial enlarged view at B in fig. 5.

Thus, compared to the fireproof plate 124 and the frame 1212 being formed as an integral part by an integral molding process, in the embodiment, the fireproof plate 124 and the frame 1212 are connected by the connecting portion, and the fireproof plate 124 and the frame 1212 are separate members, so that the connection strength between the fireproof plate 124 and the frame 1212 is low, and the notch 123 formed on the fireproof plate 124 is easier to be broken, which is helpful to ensure that the flexible battery cell 100 can effectively discharge high-temperature gas in a directional manner.

Moreover, by forming the notch 1213 on the frame 1212, the notch 1213 on the frame 1212 is an open notch of "U" shape, and compared with the notch of "U" shape, the material consumption of the frame 1212 can be further reduced, which is beneficial to reducing the weight of the soft package battery cell 100, so as to improve the energy density of the soft package battery cell 100.

The connecting portion may be a screw, and the fireproof plate 124 is screwed with the frame 1212; alternatively, the connection portion may be adhesive, and the fireproof plate 124 is adhered to the frame 1212; still alternatively, the connection portion may be solder, and the fireproof plate 124 is welded to the frame 1212. In the embodiment where the connection portion is a screw, and the fireproof plate 124 is screwed to the frame 1212, after the cell body 110 is thermally out of control and the score portion 123 is cracked, the cracked fireproof plate 124 may be detached and a new fireproof plate 124 may be replaced.

In some embodiments, for example, as shown in fig. 3, two notches 1213 may be disposed on one side edge of the frame 1212, where the two notches 1213 are spaced along the extending direction of the side edge, and a notch 123 is formed on the fireproof plate 124 corresponding to each notch 1213. Therefore, the number of the notch portions 123 can be increased to further ensure that the flexible battery cell 100 can release pressure in a directional manner, and a partial area is reserved between the two notches 1213 on the side edge of the frame 1212 to ensure that the casing 121 has a certain structural strength after the notch 1213 is cut off. It is to be understood that the number of the notches 1213 is not limited to the above number, and may be designed according to actual conditions, for example, the number of the notches 1213 may be one or more than two. In general, at least one notch 1213 is provided on the frame 1212, and the number of notches 1213 may be reasonably designed according to the structure of the frame 1212.

Fig. 7 is a partial enlarged view at C in fig. 5. According to some embodiments of the present utility model, as shown in fig. 3, 5 and 7, the soft package battery 100 further includes a heat conducting member 126 disposed in the cavity, the heat conducting member 126 and the notch 123 are respectively located at two sides of the battery cell body 110 along the second direction, and the heat conducting member 126 is closely attached to the inner surfaces of the battery cell body 110 and the package housing 120.

Through setting up heat conduction spare 126, the heat that soft packet of electric core 100 in the course of the work, electric core body 110 produced can transmit for heat conduction spare 126, and heat conduction spare 126 transmits the heat that receives for encapsulation shell 120 for soft packet of electric core 100 can dispel the heat the cooling. When the soft package battery cell 100 is applied in a battery pack, a cooling system can be further disposed in the battery pack, and at this time, the package housing 120 can be conducted to the cooling system after receiving the heat transferred by the heat conducting member 126, so as to achieve heat dissipation.

Wherein the second direction may be the same as the first direction. Alternatively, in other possible implementations, the second direction may be perpendicular to the first direction, so that the heat conducting member 126 and the notch 123 are not disposed on two sides of the cell body 110 along the butt joint direction of the package housing 120, so that when the plurality of soft package cells 100 are applied in the battery package and arranged along the first direction, the notch 123 is not blocked by the adjacent soft package cells 100, so as to ensure that the high-temperature gas can punch out the notch 123. Specifically, as shown in fig. 3, for example, the first direction is the X-axis direction, and the second direction is the Y-axis direction. Of course, the second direction may be the Z-axis direction, as long as the notch 123 and the opening are located on different sides of the cell body 110.

The implementation of the heat conductive member 126 is various. Illustratively, the thermally conductive member 126 may be a thermally conductive glue cure or a thermally conductive silicone. The present embodiment is not limited thereto, and the heat conductive member 126 may be a graphite sheet, a copper foil, or an aluminum foil.

In some embodiments, the heat conducting member 126 may be, for example, a plate-shaped heat conducting plate, and the heat conducting plate extends along a third direction, and the third direction is perpendicular to both the first direction and the second direction. In the example shown in fig. 3, the third direction is the Z-axis direction. Thus, the contact area between the heat conducting plate and the battery cell body 110 is large, and the heat dissipation and cooling effects are good.

With continued reference to fig. 3 and 7, the junction of the base 1211 and the frame 1212 in the housing 121 forms an arcuate transition surface to facilitate reducing stress concentrations at the junction. In this example, the heat conducting plate further includes a flat plate 1261 and an arc plate 1262 connected, where the arc plate 1262 is attached to the arc transition surface. Through the arrangement, the heat conducting piece 126 can be adapted to the arc transition surface of the shell 121, so that the installation stability of the heat conducting plate in the cavity can be improved, and the contact area between the heat conducting plate and the shell 121 can be enlarged, thereby being beneficial to improving the heat dissipation and cooling effects.

In some embodiments, the thermally conductive member 126 may be adhesively attached to the inner surface of the housing 121 by an adhesive. The heat conducting member 126 may be adhered to the side of the cell body 110 facing away from the notch 123. Alternatively, the heat conducting member 126 may be adhered to both the inner surface of the housing 121 and the surface of the cell body 110 facing away from the notch 123. Thus, the heat conductive member 126 is adhered and fixed between the cell body 110 and the inner surface of the case 121, and the mounting is stable, so that the heat conductive function can be reliably realized.

In addition, in some embodiments, as shown in fig. 3 and 5, the soft package battery cell 100 further includes a buffer member 127 disposed in the cavity, and the buffer member 127 is located between the cover 122 and the battery cell body 110 and is tightly attached to the cover 122 and the battery cell body 110. Thus, when the plurality of soft package battery cells 100 are applied to the battery pack and the plurality of soft package battery cells 100 are arranged along the first direction, the buffer member 127 can play a role in buffering and protecting the battery cell body 110, so as to prevent the battery cell body 110 from being damaged by excessive extrusion of the adjacent soft package battery cells 100.

The cushioning member 127 is resilient and the cushioning member 127 is compressible to provide cushioning protection. For example, the buffer 127 may be made of high temperature resistant compressible foam (e.g., silicon foam). For another example, the buffer 127 may be made of a high temperature resistant rubber mat or a silicone glue.

In some embodiments, the buffer 127 may be connected to a side of the cover 122 facing the battery cell body 110 by adhesive. The buffer member 127 may be connected to a surface of the battery cell body 110 facing the cover 122 through adhesive. Alternatively, the buffer 127 may be adhered to and fixed to both the surface of the cover 122 facing the battery cell body 110 and the surface of the battery cell body 110 facing the cover 122. Thus, the buffer member 127 is fixed between the cell body 110 and the cover 122 by adhesion, and the mounting is stable, so that the buffer protection function can be reliably realized.

In some embodiments, the battery module 1000 provided in this embodiment includes the plurality of soft package battery cells 100, and the plurality of soft package battery cells 100 are arranged along the first direction. In addition, the notch 123 is located at one side of the cell body 110 along the second direction, and the notch 123 is not blocked by the adjacent soft package cell 100, so as to ensure that the notch 123 can be flushed by high-temperature gas.

Referring to fig. 1 to 5, a fixing portion 128 is further disposed on the outer surface of the package housing 120 in a protruding manner. Specifically, when the package housing 120 is mainly composed of the housing 121 and the cover 122, the fixing portion 128 is disposed on the outer surface of the housing 121 in a protruding manner. So set up, when a plurality of soft packet of electric core 100 assemble and form battery module 1000 or a plurality of soft packet of electric core 100 are applied to in the battery package, a plurality of soft packet of electric core 100 arrange along first direction, and the fixed part 128 of arbitrary adjacent two soft packet of electric core 100 can interconnect for a plurality of soft packet of electric core 100 can be convenient link to each other.

The fixing portion 128 may be, for example, a fixing column, where one end of the fixing column along the first direction is provided with a clamping hole 1281, the other end of the fixing column along the first direction is provided with a clamping column 1282, and a center line of the clamping hole 1281 and an axis of the clamping column 1282 all extend along the first direction. In this embodiment, taking three soft-package battery cells 100 as an example, the assembly process of the plurality of soft-package battery cells 100 is described with reference to fig. 1 and 4, and the specific process may be: the three soft package cells 100 are arranged along the first direction, the clamping columns 1282 on the middle soft package cell 100 are aligned with and clamped with the clamping holes 1281 on the adjacent soft package cell 100, and then the clamping columns 1282 on the adjacent soft package cell 100 are aligned with and clamped with the clamping holes 1281 on the middle soft package cell 100.

Of course, in other possible examples of the present utility model, the fixing portions 128 on any two adjacent flexible battery cells 100 may be detachably connected by bolts, screws, pins, or the fixing portions 128 on any two adjacent flexible battery cells 100 may be connected by welding.

Referring to fig. 1 to 3, four fixing portions 128 may be convexly disposed on an outer surface of the case 121, and the four fixing portions 128 are disposed near four corner ends of the substrate 1211, respectively. In this way, the number of the fixing portions 128 is increased, and the connection positions of the two adjacent soft package battery cells 100 are increased, so that the connection reliability of the two adjacent soft package battery cells 100 is improved. It is understood that the number of the fixing portions 128 is not limited to the above number, and may be designed according to actual conditions.

It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.

Claims (16)

1. A soft pack cell, comprising:

a cell body; and

the battery cell packaging structure comprises a packaging shell, wherein a cavity for accommodating the battery cell body is formed in the packaging shell, the packaging shell is made of fireproof heat-insulating materials, a notch part is formed in the packaging shell and is configured to be cracked when the air pressure in the cavity reaches a preset value.

2. The soft pack cell of claim 1, wherein,

the packaging shell is provided with an opening, the opening is communicated with the cavity, and the opening and the notch part are positioned on different sides of the battery cell body;

the battery cell body is provided with a plurality of lugs, and each lug extends out of the packaging shell from the opening.

3. The soft package battery cell according to claim 2, further comprising a plurality of heat-resistant members disposed in the cavity, each of the tabs being sandwiched between two of the heat-resistant members.

4. A soft pack cell according to claim 3, wherein the heat resistant member is made of a deformable material.

5. The flexible battery cell according to claim 4, wherein the deformable material is high temperature resistant compressible foam, high temperature resistant rubber mat, or high temperature resistant glue cured.

6. The flexible battery cell of claim 2, wherein the side wall of the package housing having the opening therein is made of an insulating material and the remaining side walls are made of a metal material.

7. The flexible package of any of claims 1-6, wherein the package housing comprises:

a housing; and

the cover body is in butt joint with the shell body along the first direction and jointly encloses to form the cavity.

8. The soft pack cell of claim 7, wherein,

the cover body is of a flat plate structure;

the shell comprises a substrate and a frame, the frame is connected with the peripheral edges of the substrate, and the frame, the substrate and the cover body enclose together to form the cavity.

9. The soft pack cell of claim 8, wherein,

at least one notch is arranged on the frame, and the notch on the frame is U-shaped;

the packaging shell further comprises a fireproof plate, the fireproof plate is connected with the frame through a connecting portion and seals the notch, and the notch portion is formed in an area, corresponding to the notch, of the fireproof plate.

10. The soft pack cell of claim 9, wherein the number of indentations is one or more than two.

11. The flexible package of claim 9, wherein the connection is a screw, an adhesive, or a solder.

12. The flexible battery cell of claim 8, further comprising a buffer disposed in the cavity, the buffer being located between the cover and the battery cell body and in close proximity to the cover and the battery cell body.

13. The flexible battery cell of any one of claims 1-6, further comprising a heat conducting member disposed in the cavity, the heat conducting member and the score being located on two sides of the battery cell body along the second direction, respectively, the heat conducting member being in close contact with the inner surfaces of the battery cell body and the package housing.

14. The flexible battery cell of claim 13, wherein the thermally conductive member is a thermally conductive glue cure or a thermally conductive silicone.

15. A battery module, comprising: a plurality of soft pack cells as claimed in any one of claims 1 to 14.

16. The battery module according to claim 15, wherein a fixing portion is provided on an outer surface of the package case of the soft pack battery cell in a protruding manner, a plurality of the soft pack battery cells are arranged in a first direction, and the fixing portions of any adjacent two of the soft pack battery cells are connected.