Battery pressure relief device and soft package battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pressure relief device and a soft package battery, the battery pressure relief device is used for the soft package battery, the soft package battery comprises a pole group and a packaging film wrapping the outer side of the pole group, the pole group comprises a first side face and a second side face which are oppositely arranged, and the battery pressure relief device is arranged between the pole group and the packaging film. The battery pressure relief device comprises a spine part, a pulling part and a fixing part, the spine part is arranged on the first side face of the pole group, and at least part of the spine part is fixedly connected with the first side face. The fixing part is arranged on the second side face of the pole group, the fixing part is fixedly connected with the packaging film on the side where the second side face is located, the spine part and the fixing part are connected through the pulling part, and the spine part is sequentially pulled by the fixing part and the pulling part to tilt so as to puncture the packaging film. According to the battery pressure relief device and the soft package battery, the explosion risk of the soft package battery is reduced, and the use safety of the soft package battery is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery pressure relief device and a soft-pack battery. Background Art

[0002] Soft-pack batteries have the characteristics of high specific energy, small volume, light weight, etc., and are widely used in fields such as automobiles and electronic devices.

[0003] A soft-pack battery mainly includes an electrode assembly and a packaging film. The packaging film is usually coated on the outside of the electrode assembly through a hot pressing process to achieve insulation of the electrode assembly. However, during the use of a soft-pack battery, once gas is generated inside the soft-pack battery due to abnormal reasons (for example, overheating of the battery), it is difficult for the gas to escape from the battery due to the obstruction of the packaging film, which is likely to cause the soft-pack battery to bulge, and even cause the soft-pack battery to explode. This greatly affects the use safety of the soft-pack battery. Utility Model Content

[0004] The purpose of the present application is to provide a battery pressure relief device and a soft-pack battery, so as to solve to a certain extent the technical problem existing in the prior art that during the use of a soft-pack battery, once gas is generated inside the soft-pack battery due to abnormal reasons (for example, overheating of the battery), it is difficult for the gas to escape from the battery due to the obstruction of the packaging film, which is likely to cause the soft-pack battery to bulge, and even cause the soft-pack battery to explode. This greatly affects the use safety of the soft-pack battery.

[0005] According to a first aspect of the present application, a battery pressure relief device for a soft-pack battery is provided. The soft-pack battery includes an electrode assembly and a packaging film coated on the outside of the electrode assembly. The electrode assembly includes a first side surface and a second side surface arranged opposite to each other. The battery pressure relief device is arranged between the electrode assembly and the packaging film;

[0006] The battery pressure relief device includes a spike portion, a pulling portion, and a fixing portion. The spike portion is arranged on the first side surface of the electrode assembly, and at least part of the spike portion is fixedly connected to the first side surface;

[0007] The fixing portion is arranged on the second side surface of the electrode assembly, and the fixing portion is fixedly connected to the packaging film on the side where the second side surface is located. The spike portion and the fixing portion are connected by the pulling portion, so that the spike portion can be sequentially pulled up by the fixing portion and the pulling portion to be able to pierce the packaging film.

[0008] Preferably, the spike portion has a front end and a tail end arranged opposite to each other;

[0009] The spike portion includes a first wing and a second wing. The front ends of the first wing and the second wing intersect and form a sharp angle pointing forward;

[0010] The spiked part is fixedly connected to the first side surface via the tail ends of both the first wing and the second wing.

[0011] Preferably, the tail ends of both the first wing and the second wing are spaced apart, and the pulling part passes through the gap between the tail ends of both the first wing and the second wing and is connected to the front end of the spiked part.

[0012] Preferably, the pulling part extends in a predetermined direction, and the first wing and the second wing are symmetrically arranged with respect to the pulling part.

[0013] Preferably, the numbers of both the spiked part and the pulling part are multiple. Each spiked part has at least one pulling part connected thereto, and one ends of the multiple pulling parts away from the spiked parts are all connected to the fixing part.

[0014] Preferably, the pulling part includes a main path and multiple branch paths. The number of the spiked parts is multiple. Each spiked part has at least one branch path connected thereto. One ends of the multiple branch paths away from the spiked parts are all connected to the first end of the main path, and the second end of the main path is connected to the fixing part.

[0015] Preferably, the battery pressure relief device is an insulating member.

[0016] Preferably, the battery pressure relief device is an insulating plastic member.

[0017] Preferably, the part of the spiked part for piercing the packaging film is set as a structure processed by a curing process.

[0018] According to a second aspect of the present application, there is provided a soft-pack battery including the battery pressure relief device according to any one of the above technical solutions. Therefore, it has all the beneficial technical effects of this battery pressure relief device and will not be elaborated herein.

[0019] Compared with the prior art, the beneficial effects of the present application are as follows:

[0020] For the battery pressure relief device provided by the present application, the spiked part is arranged on the first side surface of the electrode group, and at least part of the spiked part is fixedly connected to the first side surface. The fixing part is arranged on the second side surface of the electrode group, and the fixing part is fixedly connected to the packaging film on the side where the second side surface is located. In this way, when the battery bulges (i.e., the packaging film is pushed up and deformed), the fixing part will be pulled as the packaging film bulges, and then the pulling part will pull the spiked part to tilt up to pierce the packaging film on the side where the second side surface is located, realizing automatic exhaust of the soft-pack battery, reducing the risk of explosion of the soft-pack battery, and ensuring the use safety of the soft-pack battery.

[0021] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides preferred embodiments in conjunction with the accompanying drawings and describes them in detail as follows. Description of the Drawings

[0022] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Structural schematic diagram of the soft-pack battery provided by the embodiment of the present application;

[0024] Figure 2 Axonometric structural schematic diagram of the soft-pack battery provided by the embodiment of the present application in a bulged state;

[0025] Figure 3 Structural schematic diagram of the battery pressure relief device provided by the embodiment of the present application;

[0026] Figure 4 Structural schematic diagram of the battery pressure relief device provided by the embodiment of the present application when the soft-pack battery is in a bulged state;

[0027] Figure 5 Structural schematic diagram of the battery pressure relief device provided by Embodiment 1 of the present application;

[0028] Figure 6 Structural schematic diagram of the battery pressure relief device provided by Embodiment 2 of the present application;

[0029] Figure 7 Structural schematic diagram of the battery pressure relief device provided by Embodiment 3 of the present application;

[0030] Figure 8 Structural schematic diagram of the battery pressure relief device provided by Embodiment 4 of the present application;

[0031] Figure 9 Structural schematic diagram of the battery pressure relief device provided by Embodiment 5 of the present application;

[0032] Figure 10 Another structural schematic diagram of the soft-pack battery provided by the embodiment of the present application;

[0033] Figure 11 Another structural schematic diagram of the soft-pack battery provided by the embodiment of the present application.

[0034] Reference Signs:

[0035] 1 - Battery pressure relief device; 11 - Spiked part; 111 - First flank; 112 - Second flank; 12 - Pulling part; 121 - Branch; 122 - Main path; 13 - Fixing part; 2 - Electrode group; 21 - Positive electrode tab; 22 - Negative electrode tab; 3 - Encapsulation film. Detailed implementation manners

[0036] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0037] Generally, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0038] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0041] Next, refer to Figures 1 to 11 Describe the battery pressure relief device and the soft-pack battery according to some embodiments of the present application.

[0042] See Figures 1 to 11As shown, an embodiment of the present application provides a battery pressure relief device for a soft-pack battery. The soft-pack battery includes a pole group 2 and a packaging film 3 wrapped around the outside of the pole group 2. The pole group 2 includes a first side and a second side disposed opposite to each other. The battery pressure relief device 1 is disposed between the pole group 2 and the packaging film 3. The battery pressure relief device 1 includes a spike portion 11, a pulling portion 12, and a fixing portion 13. The spike portion 11 is disposed on the first side of the pole group 2, and at least a part of the spike portion 11 is fixedly connected to the first side. The fixing portion 13 is disposed on the second side of the pole group 2, and the fixing portion 13 is fixedly connected to the packaging film 3 on the side where the second side is located. The spike portion 11 and the fixing portion 13 are connected via the pulling portion 12, so that the spike portion 11 can be sequentially pulled up by the fixing portion 13 and the pulling portion 12 to be able to pierce the packaging film 3.

[0043] According to the battery pressure relief device provided by the above technical features, by disposing the spike portion 11 on the first side of the pole group 2, and at least a part of the spike portion 11 is fixedly connected to the first side. And the fixing portion 13 is disposed on the second side of the pole group 2, and the fixing portion 13 is fixedly connected to the packaging film 3 on the side where the second side is located. Thus, when the battery bulges (i.e., the packaging film 3 is pushed up and deformed), the fixing portion 13 will be pulled as the packaging film 3 bulges. Under the action of the pulling portion 12 that supports the pole group 2, the pulling portion 12 can pull the spike portion 11 up to pierce the packaging film 3 on the side where the second side is located, realizing automatic exhaust of the soft-pack battery, reducing the risk of explosion of the soft-pack battery, and ensuring the use safety of the soft-pack battery.

[0044] Preferably, as Figures 1 to 9 shown, the spike portion 11 has a front end and a tail end disposed opposite to each other. The spike portion 11 may include a first wing 111 and a second wing 112. The front ends of the first wing 111 and the second wing 112 intersect and form a sharp angle pointing forward to facilitate the spike portion 11 piercing the packaging film 3.

[0045] Preferably, the above sharp angle may be a right angle or an acute angle, thereby improving the sharpness of the spike portion 11 and ensuring the success rate of the spike portion 11 piercing the packaging film 3.

[0046] However, it is not limited thereto. As long as the spike portion 11 can pierce the packaging film 3, the structure of the spike portion 11 is not limited to the structure where the first wing 111 and the second wing 112 intersect. For example, the spike portion 11 may also be triangular, four-pointed star-shaped, or five-pointed star-shaped, etc.

[0047] Preferably, as Figures 2 to 4 shown, the spike portion 11 may be fixedly connected to the first side via the tail ends of the first wing 111 and the second wing 112 (i.e., the shaded parts of the first wing 111 and the second wing 112 shown in the figure) to facilitate the front end of the spike portion 11 to be pulled up.

[0048] Preferably, as Figures 1 to 9 shown, the ends of both the first wing 111 and the second wing 112 are spaced apart. The pulling part 12 passes through the gap between the ends of both the first wing 111 and the second wing 112 and is connected to the front end of the spike part 11. In this way, on the one hand, it is convenient for the pulling part 12 to pull up the sharp corner at the front end of the spike part 11, and thus it is convenient for the spike part 11 to pierce the encapsulation film 3; on the other hand, the stability of the spike part 11 when it is pulled up is ensured during the process of pulling up the spike part 11.

[0049] In the embodiment, preferably, as Figures 1 to 5 and Figure 9 shown, the number of the above-mentioned spike parts 11 may be equal to the number of the above-mentioned pulling parts 12, that is, one spike part 11 is connected to the fixing part 13 via one pulling part 12.

[0050] Preferably, as Figures 1 to 5 and Figure 9 shown, the above-mentioned pulling part 12 extends along a predetermined direction, and the first wing 111 and the second wing 112 are symmetrically arranged with respect to the pulling part 12. In this way, during the process of pulling up the spike part 11, it is ensured that the sharp corner of the spike part 11 does not tilt, and the success rate of the spike part 11 piercing the encapsulation film 3 is further improved.

[0051] Optionally, as Figure 7 shown, the figure shows that the spike part 11 is connected to the fixing part 13 via two pulling parts 12.

[0052] Preferably, as Figure 9 shown, the numbers of both the above-mentioned spike parts 11 and the pulling parts 12 are multiple. Each spike part 11 has a pulling part 12 connected thereto, and the ends of the multiple pulling parts 12 far from the spike parts 11 are all connected to the fixing part 13.

[0053] Optionally, as Figure 8 shown, the pulling part 12 may include a main path 122 and multiple branch paths 121. The number of the spike parts 11 is multiple. Each spike part 11 has a branch path 121 connected thereto. The ends of the multiple branch paths 121 far from the spike parts 11 are all connected to the first end of the main path 122, and the second end of the main path 122 is connected to the fixing part 13. When the fixing part 13 moves along with the bulged encapsulation film 3, the main path 122 drives the multiple branch paths 121 to pull up each spike part 11, so as to further improve the success rate of the battery pressure relief device 1 piercing the encapsulation film 3.

[0054] Optionally, as Figure 6 shown, the figure shows an example in which each spike part 11 is connected to the main path 122 via two branch paths 121.

[0055] In an embodiment, preferably, the battery pressure relief device 1 can be an insulating member to reduce the impact of the battery pressure relief device 1 on the battery.

[0056] Preferably, the battery pressure relief device 1 can be an insulating plastic member, such as a PT plastic member, a PP plastic member, etc.

[0057] Preferably, the portion of the spike portion 11 for piercing the encapsulation film (i.e., the sharp corner of the spike portion 11) is set to a structure processed by a curing process. Thus, the strength of the sharp corner of the spike portion 11 is further improved, and further, the probability of the spike portion 11 piercing the encapsulation film 3 is increased.

[0058] In an embodiment, the fixing portion 13 can be in a sheet shape, thereby increasing the contact area between the fixing portion 13 and the encapsulation film 3 and ensuring the connection strength between the fixing portion 13 and the encapsulation film 3.

[0059] See Figure 1 、 Figure 2 、 Figure 10 and Figure 11 , an embodiment of the present application further provides a soft-pack battery, including the above-mentioned electrode group 2, the above-mentioned encapsulation film 3, and the battery pressure relief device described in any of the above embodiments. Therefore, it has all the beneficial technical effects of the battery pressure relief device 1, and details are not described herein again.

[0060] Preferably, taking the above soft-pack battery as a rectangular battery as an example, the first side and the second side can be two large surfaces of the electrode group 2 (i.e., two surfaces with the largest areas among the six surfaces of the electrode group 2).

[0061] Preferably, the electrode group 2 can include a positive electrode tab 21 and a negative electrode tab 22.

[0062] Preferably, as Figure 1 、 Figure 2 and Figure 10 shown, both the positive electrode tab 21 and the negative electrode tab 22 can be led out from the same side of the electrode group 2. Preferably, the pulling portion 12 of the battery pressure relief device 1 can cross the electrode group 2 from a side of the electrode group 2 opposite to the leading-out side of both the positive electrode tab 21 and the negative electrode tab 22.

[0063] Preferably, as Figure 11 shown, both the positive electrode tab 21 and the negative electrode tab 22 can be respectively led out from two opposite sides of the electrode group 2. Correspondingly, the pulling portion 12 of the pressure relief device can cross the electrode group 2 from a side of the electrode group 2 adjacent to the leading-out sides of both the positive electrode tab 21 and the negative electrode tab 22.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pressure relief device for a soft-pack battery, the soft-pack battery comprising a pole group and a packaging film covering the outside of the pole group, characterized in that, The electrode group includes a first side and a second side that are oppositely arranged, and the battery pressure relief device is arranged between the electrode group and the encapsulation film; The battery pressure relief device includes a spike part, a pulling part, and a fixing part. The spike part is arranged on the first side of the electrode group, and at least a part of the spike part is fixedly connected to the first side; The fixing part is arranged on the second side of the electrode group, and the fixing part is fixedly connected to the encapsulation film on the side where the second side is located. The spike part and the fixing part are connected via the pulling part, so that the spike part can be sequentially pulled up by the fixing part and the pulling part to be able to pierce the encapsulation film.

2. The battery pressure relief device according to claim 1, wherein The spike part has a front end and a tail end that are oppositely arranged; The spike part includes a first wing and a second wing. The front ends of the first wing and the second wing intersect and form a sharp angle pointing forward; The spike part is fixedly connected to the first side via the tail ends of the first wing and the second wing.

3. The battery pressure relief device according to claim 2, characterized in that, The tail ends of the first wing and the second wing are arranged at intervals, and the pulling part passes through the gap between the tail ends of the first wing and the second wing and is connected to the front end of the spike part.

4. The battery pressure relief device according to claim 2, wherein The pulling part extends along a predetermined direction, and the first wing and the second wing are symmetrically arranged with respect to the pulling part.

5. The battery pressure relief device according to any one of claims 1 to 4, characterized in that, The number of both the spike part and the pulling part is multiple. Each spike part has at least one pulling part connected thereto, and one end of the multiple pulling parts away from the spike part is connected to the fixing part.

6. The battery pressure relief device according to any one of claims 1 to 4, characterized in that The pulling part includes a main path and multiple branch paths. The number of spike parts is multiple. Each spike part has at least one branch path connected thereto. One end of the multiple branch paths away from the spike part is connected to the first end of the main path, and the second end of the main path is connected to the fixing part.

7. The battery pressure relief device according to claim 1, characterized in that, The battery pressure relief device is an insulating part.

8. The battery pressure relief device according to claim 7, wherein, The battery pressure relief device is an insulating plastic part.

9. The battery pressure relief device according to claim 8, characterized in that, The part of the spike part for piercing the encapsulation film is set as a structure processed by a curing process.

10. A soft-pack battery, characterized in that, It includes the electrode group, the encapsulation film, and the battery pressure relief device according to any one of claims 1 to 9.

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