Soft package battery monomer and soft package battery with same

Abstract

The utility model discloses a soft package battery monomer and a soft package battery with the same, the soft package battery monomer comprises a packaging film and a pole group, the packaging film is provided with an accommodating cavity, and the pole group is arranged in the accommodating cavity; and the pressure relief piece is arranged in the accommodating cavity, the pressure relief piece is provided with a puncture part, and the puncture part is configured to puncture the packaging film when the soft package battery monomer is swelled so as to puncture the packaging film. According to the soft package battery monomer disclosed by the utility model, the pressure relief piece is arranged in the accommodating cavity of the packaging film and can pierce the packaging film when the soft package battery monomer is expanded, so that the structure is compact, the soft package battery monomer can be subjected to pressure relief in time, and the safety performance of the soft package battery is well improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a soft-pack battery monomer and a soft-pack battery having the same. Background Art

[0002] Soft-pack batteries have a large application market due to their advantages such as large specific energy, small size, and light weight. Soft-pack batteries are generally assembled from multiple soft-pack battery cells. When soft-pack battery cells bulge or swell, they pose a great safety hazard. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a soft-pack battery cell, which can release pressure in time when bulging or bloating occurs, so that the soft-pack battery cell has better safety performance.

[0004] The utility model also provides a soft-pack battery having the soft-pack battery monomer.

[0005] According to the first aspect of the utility model, the soft-pack battery cell comprises: a packaging film and a pole group, the packaging film having a housing cavity, the pole group being arranged in the housing cavity; a pressure relief piece, the pressure relief piece being arranged in the housing cavity, the pressure relief piece having a puncture portion, the puncture portion being configured to pierce the packaging film when the soft-pack battery cell swells, so as to puncture the packaging film.

[0006] According to the soft-pack battery cell of the utility model, a pressure relief piece is provided, which is arranged in the accommodating cavity of the packaging film and can puncture the packaging film when the soft-pack battery cell swells. The structure is compact, so that the soft-pack battery cell can release pressure in time, thereby greatly improving the safety performance of the soft-pack battery.

[0007] In some embodiments of the utility model, the pressure relief member also includes: a connecting portion, the connecting portion is arranged on one side surface of the pole group in the thickness direction, the puncture portion is connected to the connecting portion, the puncture portion extends along the first direction and forms a tip at one end away from the connecting portion; an involvement portion, one end of the involvement portion is connected to the connecting portion, and is located on the same side of the connecting portion in the first direction as the puncture portion, the other end of the involvement portion is arranged on the other side of the pole group in the thickness direction, the other end of the involvement portion is connected to the inner wall of the packaging film, and the involvement portion is configured to pull the connecting portion to move along the first direction toward the inner wall of the packaging film when the soft-pack battery cell is swollen.

[0008] In one embodiment of the utility model, the connecting portion includes: a first connecting section, the first connecting section is arranged on the one side of the pole group in the thickness direction, the first connecting section extends along the first direction, and one end of the first connecting section is connected to the connecting portion; a second connecting section, the second connecting section is arranged on the other side of the pole group in the thickness direction, the second connecting section extends along the first direction, and one end of the second connecting section is connected to the inner wall of the packaging film; a third connecting section, the third connecting section is arranged on one side of the pole group in the first direction, and both ends of the third connecting section are respectively connected to the other end of the first connecting section and the other end of the second connecting section.

[0009] In one embodiment of the present utility model, a avoidance groove is provided at one end of the involvement portion, the opening of the avoidance groove faces the connecting portion, and the puncture portion is located in the avoidance groove.

[0010] In one embodiment of the utility model, the pressure relief component also includes: a fixing portion, which is arranged on one side surface of the pole group in the thickness direction and is fixedly connected to the pole group; an extension portion, which extends along a first direction, and is connected between the fixing portion and the connecting portion, and the fixing portion and the puncture portion are located on the same side of the connecting portion in the first direction, and the extension portion can be bent and deformed along the first direction.

[0011] In some examples of the present invention, the fixing portion extends along the first direction, the number of the fixing portions is two, and the two fixing portions are respectively arranged on both sides of the connecting portion in the second direction.

[0012] In some examples of the present invention, the extension portion extends along the first direction, the number of the extension portions is two, and the two extension portions are respectively arranged on both sides of the puncture portion in the second direction.

[0013] In some embodiments of the present invention, the pressure relief component is an integrated component.

[0014] In some embodiments of the present invention, the pressure relief component is a plastic component.

[0015] A soft-pack battery according to a second aspect of the present invention includes the soft-pack battery cell according to the first aspect of the present invention.

[0016] According to the soft-pack battery of the utility model, by setting the soft-pack battery monomer of the first aspect, the soft-pack battery monomer is provided with a pressure relief piece, which is arranged in the accommodating cavity of the packaging film and can puncture the packaging film when the soft-pack battery monomer swells. The structure is compact, so that the soft-pack battery monomer can release pressure in time, thereby greatly improving the safety performance of the soft-pack battery.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a soft-pack battery cell according to an embodiment of the utility model;

[0019] Figure 2 is a cross-sectional view of a soft-pack battery cell according to an embodiment of the utility model;

[0020] Figure 3 is a schematic diagram of a flattened pressure relief member according to an embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of a pressure relief member according to an embodiment of the utility model after being assembled in a soft-pack battery cell;

[0022] Figure 5 is a schematic diagram of a pressure relief member according to an embodiment of the utility model when a soft-pack battery cell is relieving pressure;

[0023] Figure 6 It is a schematic diagram of the pressure relief member and the electrode group according to the embodiment of the utility model when the soft-pack battery cell is under pressure relief.

[0024] Reference numerals:

[0025] 10. packaging film; 101. containing cavity;

[0026] 20. Pressure relief parts; 201. Avoidance groove;

[0027] 21. fixing part; 22. extension part; 23. connecting part; 24. puncture part;

[0028] 25, the connection part; 251, the first connection section; 252, the second connection section; 253, the third connection section;

[0029] 30. Pole group;

[0030] 100. Soft-pack battery cell. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] Reference below Figure 1-Figure 6 A soft-pack battery cell 100 according to an embodiment of the first aspect of the present invention is described.

[0033] like Figure 1-Figure 6 As shown, the soft-pack battery cell 100 according to the embodiment of the first aspect of the utility model comprises: a packaging film 10, a pole group 30 and a pressure relief member 20. Specifically, the packaging film 10 has a receiving cavity 101, and the pole group 30 is arranged in the receiving cavity 101; the pressure relief member 20 is arranged in the receiving cavity 101, and the pressure relief member 20 has a puncture portion 24, and the puncture portion 24 is configured to pierce the packaging film 10 when the soft-pack battery cell 100 swells, so as to puncture the packaging film 10.

[0034] In this embodiment, a packaging film 10 and an electrode group 30 are provided, and the electrode group 30 is provided in the accommodating cavity 101 of the packaging film 10, so that the packaging film 10 can well seal and protect the electrode group 30. In this embodiment, the pressure relief member 20 is provided in the accommodating cavity 101 and has a puncture portion 24. When the soft-pack battery cell 100 has thermal runaway or the like, the pressure in the accommodating cavity 101 of the packaging film 10 increases sharply, and the packaging film 10 bulges and deforms under the action of pressure. At this time, the pressure relief member 20 pierces the packaging film 10, so that the packaging film 10 ruptures, so that the fluid can flow out of the accommodating cavity 101 in time, so that the soft-pack battery cell 100 can be timely and effectively depressurized, thereby well avoiding the risk of bursting or explosion due to excessive pressure of the soft-pack battery cell 100, and greatly improving the safety performance of the soft-pack battery cell 100.

[0035] In this embodiment, the pressure relief member 20 is disposed in the accommodating cavity 101, which can avoid occupying additional space outside the soft-pack battery, making the overall structure of the soft-pack battery cell 100 more compact and more convenient to arrange.

[0036] According to the soft-pack battery cell 100 of the embodiment of the utility model, a pressure relief member 20 is provided. The pressure relief member 20 is provided in the accommodating cavity 101 of the packaging film 10 and can pierce the packaging film 10 when the soft-pack battery cell 100 swells. The structure is compact, so that the soft-pack battery cell 100 can release pressure in time, thereby greatly improving the safety performance of the soft-pack battery.

[0037] In some embodiments of the present invention, reference Figure 4-Figure 6As shown, the pressure relief member 20 may further include: a connecting portion 23 and an involvement portion 25, the connecting portion 23 being arranged on one side surface of the electrode group 30 in the thickness direction, the puncture portion 24 being connected to the connecting portion 23, the puncture portion 24 extending along the first direction and forming a tip at one end away from the connecting portion 23; one end of the involvement portion 25 is connected to the connecting portion 23, and is located on the same side of the connecting portion 23 in the first direction as the puncture portion 24, the other end of the involvement portion 25 is arranged on the other side of the electrode group 30 in the thickness direction, the other end of the involvement portion 25 is connected to the inner wall of the packaging film 10, and the involvement portion 25 is configured to pull the connecting portion 23 to move along the first direction toward the inner wall of the packaging film 10 when the soft-pack battery cell 100 is swollen.

[0038] In this embodiment, the pressure relief member 20 is provided with a connecting portion 23 and an involving portion 25, one end of the involving portion 25 is connected to the connecting portion 23 and is located on one side surface of the electrode group 30 in the thickness direction, the other end of the involving portion 25 is located on the other side of the electrode group 30 in the thickness direction and is connected to the packaging film 10, one end of the involving portion 25 is connected to the puncture portion 24 through the connecting portion 23, the puncture portion 24 and one end of the involving portion 25 are on the same side of the connecting portion 23 in the first direction, and the puncture portion 24 is away from the connecting portion 23 to form a pointed end. When the soft-pack battery cell 100 swells, the packaging film 10 expands and deforms, and the end of the involving portion 25 connected to the packaging film 10 moves following the deformation of the packaging film 10.

[0039] The end of the involving portion 25 connected to the connecting portion 23 moves along the first direction toward the inner wall surface of the packaging film 10 under the pulling action when the packaging film 10 expands and deforms, so that the tip of the puncture portion 24 moves toward the packaging film 10 and pierces the packaging film 10. The puncture portion 24 can pierce the packaging film 10 or touch the inner wall surface of the packaging film 10, so that the packaging film 10 forms a larger pressure at the punctured portion, so that the packaging film 10 is more easily ruptured from the punctured portion under the action of the high pressure in the accommodating cavity 101, so that the high-pressure fluid accumulated in the accommodating cavity 101 flows out, thereby realizing the pressure relief of the soft-pack battery cell 100.

[0040] In this embodiment, by providing the connecting portion 23 and the involving portion 25, the puncturing portion 24 can better follow the movement of the involving portion 25 and puncture toward the packaging film 10. The structure is simple, and the connection arrangement is convenient and reasonable. The involving portion 25 can guide the movement of the puncturing portion 24 in cooperation with the connecting portion 23 to a certain extent, so that the tip of the puncturing portion 24 can stably and reliably puncture toward the inner wall surface of the packaging film 10, so that the pressure relief member 20 can stably and reliably play a pressure relief role.

[0041] In this embodiment, one end of the connection part 25 is connected to the packaging film 10, so that when the soft-pack battery cell 100 swells, the connection part 25 can use the displacement of the packaging film 10 when it expands and deforms to drive the movement of the puncture part 24, and can automatically realize the pressure relief operation. The structure is simple, and the pressure relief operation can be performed in time, so that the soft-pack battery cell 100 has good safety performance. When the soft-pack battery cell 100 does not swell, the connection part 25 and the puncture part 24 of the pressure relief member 20 can maintain a stable structural state, so that the soft-pack battery cell 100 can operate stably and well.

[0042] In one embodiment of the present invention, reference Figure 2 and Figure 4 As shown, the connection portion 25 may include: a first connection segment 251, a second connection segment 252 and a third connection segment 253, the first connection segment 251 is arranged on one side of the electrode group 30 in the thickness direction, the first connection segment 251 extends along the first direction, and one end of the first connection segment 251 is connected to the connection portion 23; the second connection segment 252 is arranged on the other side of the electrode group 30 in the thickness direction, the second connection segment 252 extends along the first direction, and one end of the second connection segment 252 is connected to the inner wall of the packaging film 10; the third connection segment 253 is arranged on one side of the electrode group 30 in the first direction, and two ends of the third connection segment 253 are respectively connected to the other end of the first connection segment 251 and the other end of the second connection segment 252.

[0043] In this embodiment, the connection portion 25 includes a first connection segment 251, a second connection segment 252 and a third connection segment 253. The third connection segment 253 is connected to the first connection segment 251 and the second connection segment 252 and is located on one side of the electrode group 30 in the first direction. The structure is simple and the arrangement is convenient. During the normal operation of the soft-pack battery cell 100, the first connection segment 251 and the second connection segment 252 can be stably and well arranged on both sides of the thickness direction of the electrode group 30, so that the pressure relief member 20 and the electrode group 30 can be arranged more compactly in the accommodating cavity 101, so that the overall structure of the soft-pack battery cell 100 has good compactness.

[0044] When the soft-pack battery cell 100 swells, the packaging films 10 on both sides of the electrode group 30 in the thickness direction expand and deform, and one end of the second connecting segment 252 moves following the displacement of the packaging film 10. Specifically, the second connecting segment 252 can move along the first direction, so that the third connecting segment 253 gradually moves to the other side of the electrode group 30 in the thickness direction. The other end of the first connecting segment 251 connected to the third connecting segment 253 moves along the first direction to one end of the electrode group 30 driven by the third connecting segment 253. The other end of the first connecting segment 251 continues to move and moves along the thickness direction of the electrode group 30 toward the other side of the thickness direction of the electrode group 30, thereby causing one end of the first connecting segment 251 to move along the first direction toward one end of the electrode group 30, so that the tip of the puncture portion 24 can extend out of one side of the electrode group 30, so that the tip of the puncture portion 24 can touch the inner wall surface of the packaging film 10 in the first direction, so that the pressure relief member 20 can pierce the packaging film 10 to achieve pressure relief of the soft-pack battery cell 100.

[0045] In this embodiment, the third connecting section 253 is arranged on one side of the electrode group 30 in the first direction. The electrode group 30 can provide good support during the movement of the involvement part 25, so that the involvement part 25 can stably and well drive the puncture part 24 to move toward the inner wall of the packaging film 10.

[0046] In one embodiment of the present invention, Figure 3 As shown, an escape groove 201 may be provided at one end of the engaging portion 25 , the opening of the escape groove 201 faces the connecting portion 23 , and the puncturing portion 24 is located in the escape groove 201 .

[0047] In this embodiment, an avoidance groove 201 is provided at one end of the involvement portion 25 and the opening faces the connecting portion 23, and the puncture portion 24 is provided in the avoidance groove 201. The structure is simple, which facilitates the arrangement of the involvement portion 25 and the puncture portion 24, so that the puncture portion 24 and the involvement portion 25 are more convenient and easy to connect with the connecting portion 23, and the overall structure of the involvement portion 25 and the puncture portion 24 is more compact, so that the pressure relief member 20 can occupy less space to a certain extent, and the overall structure of the soft-pack battery cell 100 is more compact and has a higher energy density.

[0048] In one embodiment of the present invention, Figure 2 and Figure 4 As shown, the pressure relief member 20 may further include: a fixed portion 21 and an extension portion 22, wherein the fixed portion 21 is disposed on one side surface of the pole group 30 in the thickness direction and is fixedly connected to the pole group 30; the extension portion 22 extends along a first direction, the extension portion 22 is connected between the fixed portion 21 and the connecting portion 23, the fixed portion 21 and the puncture portion 24 are located on the same side of the connecting portion 23 in the first direction, and the extension portion 22 can be bent and deformed along the first direction.

[0049] In this embodiment, the pressure relief member 20 is provided with a fixing portion 21 and an extension portion 22. The fixing portion 21 is fixedly connected to the electrode group 30 and is located on the same side of the connecting portion 23 in the first direction as the puncture portion 24. The fixing portion 21 is connected to the connecting portion 23 through the extension portion 22. When the soft-pack battery cell 100 is in a normal operating state, the connecting portion 23 and the puncture portion 24 can be stably and reliably fixed to one side surface of the electrode group 30 through the fixing portion 21, thereby avoiding the risk of the puncture portion 24 moving in the accommodating cavity 101 and piercing the packaging film 10, so that the soft-pack battery cell 100 can operate stably and reliably.

[0050] In this embodiment, the extension portion 22 can be bent and deformed along the first direction. When the soft-pack battery cell 100 swells, the connection portion 23 and the puncture portion 24 move along the first direction driven by the involvement portion 25. The extension portion 22 can cooperate with the movement of the connection portion 23 by bending and deforming, so that the connection portion 23 and the puncture portion 24 can be smoothly displaced, and the connection portion 23 can still be stably connected to the fixed portion 21 during the movement. The extension portion 22 can make the connection portion 23 more stable when moving to a certain extent, so that the puncture portion 24 can stably and reliably move toward the inner wall of the packaging film 10.

[0051] In some examples of the present invention, Figure 3 and Figure 4 As shown, the fixing portion 21 may extend along the first direction, and there are two fixing portions 21 , which are respectively arranged on both sides of the connecting portion 23 in the second direction.

[0052] In this embodiment, two fixing parts 21 are provided, and the two fixing parts 21 are arranged on both sides of the connecting part 23 in the second direction, respectively. The structure is simple, so that the fixing parts 21 and the connecting part 25 are convenient to arrange. The two fixing parts 21 can make the fixing of the connecting part 23 on the electrode group 30 more stable and reliable, so that the operation of the soft-pack battery cell 100 is more stable. In this embodiment, the fixing part 21 extends along the first direction, so that the fixing part 21 has a greater connection strength with the electrode group 30 in the first direction, so that the fixing part 21 can be stably connected to the extension part 22 and the connecting part 23.

[0053] In some examples of the present invention, Figure 3 and Figure 4 As shown, the extension portion 22 can extend along the first direction, and there are two extension portions 22 , which are respectively arranged on both sides of the puncture portion 24 in the second direction.

[0054] In the present embodiment, two extension portions 22 are provided, and the two extension portions 22 are respectively arranged on both sides of the puncture portion 24 in the second direction, so that the overall structure of the connection portion 23 and the extension portion 22 can be more stable, and the deflection of the connection portion 23 during the movement can be better avoided, so that the connection portion 23 can stably move along the first direction under the connection and fixing action of the two extension portions 22, so that the puncture portion 24 can stably and reliably touch the inner wall surface of the packaging film 10, so that the pressure relief member 20 can stably achieve the pressure relief effect.

[0055] In some embodiments of the present invention, the pressure relief member 20 may be an integrated member. In this embodiment, the pressure relief member 20 is configured as an integrated member, which has a simple structure and is easy to manufacture and to assemble in the soft-pack battery cell 100.

[0056] In some embodiments of the utility model, the pressure relief member 20 can be a plastic member. In this embodiment, the pressure relief member 20 is set as a plastic member, which is light in weight, low in cost, and can meet the insulation requirements when the pressure relief member 20 is arranged in the accommodating cavity 101, so that the soft-pack battery cell 100 has good safety performance.

[0057] Furthermore, the involvement portion 25, the extension portion 22, the connection portion 23 and the fixing portion 21 in the pressure relief member 20 can be flexible members, and the puncture member in the pressure relief member 20 can be a hard member, which can facilitate the connection and fixation of the fixing portion 21 on the electrode group 30, so that the involvement portion 25 can move more smoothly on both sides of the thickness direction of the electrode group 30 and on one side in the first direction, so that the extension portion 22 can bend and deform more smoothly and stably. The puncture member is set as a hard member, which can enable the puncture member to better puncture the packaging film 10, so that the packaging film 10 can be punctured quickly and efficiently to relieve pressure.

[0058] Reference below Figure 1-Figure 6 A soft-pack battery according to an embodiment of the second aspect of the utility model is described.

[0059] like Figure 1-Figure 6 As shown, the soft-pack battery according to the embodiment of the present invention includes the soft-pack battery cell 100 according to the embodiment of the first aspect of the present invention.

[0060] Other structures and operations of the soft-pack battery according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.

[0061] According to the soft-pack battery of the embodiment of the utility model, by setting the soft-pack battery cell 100 of the first embodiment, the soft-pack battery cell 100 is provided with a pressure relief piece 20, which is arranged in the accommodating cavity 101 of the packaging film 10 and can pierce the packaging film 10 when the soft-pack battery cell 100 is swollen. The structure is compact, so that the soft-pack battery cell 100 can release pressure in time, thereby greatly improving the safety performance of the soft-pack battery.

[0062] The following will refer to Figure 1-Figure 6 A soft-pack battery according to a specific embodiment of the utility model is described.

[0063] like Figure 1-Figure 6 As shown, a soft-pack battery pack includes a soft-pack battery cell 100. The soft-pack battery cell 100 includes a packaging film 10, a pole group 30, a pole ear, and a pressure relief member 20. The packaging film 10 may be an aluminum-plastic film, and the packaging film 10 has a receiving cavity 101. The pole group 30 and the pole ear are packaged by a packaging mold and sealed by hot pressing, so that the pole group 30 is in the receiving cavity 101, and the pole ear part extends out of the packaging film 10. The pole ear includes a positive pole ear and a negative pole ear. The positive pole ear and the negative pole ear can be arranged on one side of the soft-pack battery cell 100 in the first direction. Of course, the positive pole ear and the negative pole ear can also be arranged on both sides of the soft-pack battery cell 100 in the first direction, and the pole ear is welded to the pole group 30.

[0064] The pressure relief member 20 is a plastic member, and includes a fixing portion 21, an extension portion 22, a connection portion 23, an engagement portion 25, and a puncture portion 24. The fixing portion 21 is strip-shaped and extends along the first direction. There are two fixing portions 21 and they are arranged at intervals in the second direction. The two fixing portions 21 are bonded and fixed to the surface of one side of the pole group 30 in the thickness direction, and one end of the fixing portion 21 can extend to the edge of one end of the pole group 30 in the first direction. Two extension portions 22 are provided correspondingly. The extension portions 22 are strip-shaped and extend along the first direction. One end of the extension portion 22 is connected to the other end of the fixing portion 21, and the other ends of the two extension portions 22 are connected to the connection portion 23. The connection portion 23 is plate-shaped and is arranged on the side of the extension portion 22 away from the fixing portion 21.

[0065] The connection part 25 is strip-shaped, and includes a first connection section 251, a second connection section 252 and a third connection section 253. The third connection section 253 is arranged on one side of the pole group 30 in the first direction and its two ends are respectively connected to the first connection section 251 and the third connection section 253. The first connection section 251 is located between the two fixing parts 21 and the two extension parts 22. The first connection section 251 is connected to the connection part 23. The first connection section 251 is provided with an avoidance groove 201 at one end connected to the connection part 23. The puncture part 24 is arranged in the avoidance groove 201 and connected to the connection part 23. The shape of the avoidance groove 201 matches the shape of the puncture part 24. The puncture part 24 extends along the first direction and forms a tip at one end away from the connection part 23. The second connection section 252 is located on the other side of the pole group 30 in the thickness direction. One end of the second connection section 252 is connected and fixed to the packaging film 10 by bonding or hot pressing.

[0066] When the soft-pack battery cell 100 is operating normally, the pressure relief member 20 is stably arranged in the accommodating cavity 101 and is located between the outer surface of the pole group 30 and the inner surface of the packaging film 10. When the soft-pack battery cell 100 swells, the contact portion 25 moves under the displacement of the packaging film 10, thereby pulling the connecting portion 23 and the puncture portion 24 as a whole to move toward one end of the pole group 30 along the first direction, and the extension portion 22 is bent and deformed accordingly to cooperate with the movement of the connecting portion 23. The tip of the puncture portion 24 can extend out of the pole group 30 along the first direction and pierce the packaging film 10, so that the packaging film 10 is broken, thereby achieving active pressure relief and releasing the pressure in the soft-pack battery cell 100 in time. When the extension portion 22 flattens again following the movement of the connecting portion 23, the connecting portion 23 stops moving under the fixing action of the extension portion 22 and the fixing portion 21, so that the movement of the puncture portion 24 can be limited to a certain extent, so that the pressure relief member 20 can operate more stably during the pressure relief operation.

[0067] In this embodiment, the soft-pack battery is provided with a pressure relief member 20 on the soft-pack battery cell 100. The pressure relief member 20 is provided in the accommodating cavity 101 of the packaging film 10 and can puncture the packaging film 10 when the soft-pack battery cell 100 swells. The structure is compact, so that the soft-pack battery cell 100 can release pressure in time, thereby greatly improving the safety performance of the soft-pack battery.

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0072] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A soft-pack battery cell (100), characterized in that: include: A packaging film (10) and a pole group (30), wherein the packaging film (10) has a receiving cavity (101), and the pole group (30) is arranged in the receiving cavity (101); A pressure relief piece (20), the pressure relief piece (20) being arranged in the accommodating cavity (101), the pressure relief piece (20) having a puncture portion (24), the puncture portion (24) being configured to puncture the packaging film (10) when the soft-pack battery cell (100) swells, so as to puncture the packaging film (10).

2. The soft-pack battery cell (100) according to claim 1, characterized in that: The pressure relief member (20) further comprises: A connecting portion (23), the connecting portion (23) being arranged on one side surface of the electrode group (30) in the thickness direction, the puncture portion (24) being connected to the connecting portion (23), the puncture portion (24) extending along the first direction and having an end facing away from the connecting portion (23) forming a pointed end; An involvement portion (25), one end of which is connected to the connecting portion (23) and is located on the same side of the connecting portion (23) in the first direction as the puncture portion (24), the other end of which is located on the other side of the electrode group (30) in the thickness direction, the other end of which is connected to the inner wall of the packaging film (10), and the involvement portion (25) is configured to pull the connecting portion (23) to move along the first direction toward the inner wall of the packaging film (10) when the soft-pack battery cell (100) swells.

3. The soft-pack battery cell (100) according to claim 2, characterized in that: The engaging part (25) comprises: a first connecting section (251), the first connecting section (251) being arranged on the one side of the electrode group (30) in the thickness direction, the first connecting section (251) extending along the first direction, and one end of the first connecting section (251) being connected to the connecting portion (23); a second connecting section (252), the second connecting section (252) being arranged on the other side of the electrode group (30) in the thickness direction, the second connecting section (252) extending along the first direction, and one end of the second connecting section (252) being connected to the inner wall of the packaging film (10); A third connecting segment (253), the third connecting segment (253) being arranged on one side of the pole group (30) in the first direction, and two ends of the third connecting segment (253) being respectively connected to the other end of the first connecting segment (251) and the other end of the second connecting segment (252).

4. The soft-pack battery cell (100) according to claim 2, characterized in that: An avoidance groove (201) is provided at one end of the engaging portion (25), the opening of the avoidance groove (201) faces the connecting portion (23), and the puncturing portion (24) is located in the avoidance groove (201).

5. The soft-pack battery cell (100) according to claim 2, characterized in that: The pressure relief member (20) further comprises: A fixing portion (21), the fixing portion (21) being disposed on a surface of one side of the pole group (30) in the thickness direction and being fixedly connected to the pole group (30); An extension portion (22), the extension portion (22) extends along a first direction, the extension portion (22) is connected between the fixing portion (21) and the connecting portion (23), the fixing portion (21) and the puncture portion (24) are located on the same side of the connecting portion (23) in the first direction, and the extension portion (22) is bendable and deformable along the first direction.

6. The soft-pack battery cell (100) according to claim 5, characterized in that: The fixing portion (21) extends along the first direction, the number of the fixing portions (21) is two, and the two fixing portions (21) are respectively arranged on both sides of the connecting portion (23) in the second direction.

7. The soft-pack battery cell (100) according to claim 5, characterized in that: The extension portion (22) extends along the first direction, the number of the extension portions (22) is two, and the two extension portions (22) are respectively arranged on both sides of the puncture portion (24) in the second direction.

8. The soft-pack battery cell (100) according to any one of claims 1 to 7, characterized in that: The pressure relief component (20) is an integral component.

9. The soft-pack battery cell (100) according to any one of claims 1 to 7, characterized in that: The pressure relief component (20) is a plastic component.

10. A soft pack battery, characterized in that: It comprises a soft-pack battery cell (100) according to any one of claims 1 to 9.

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