Battery with directional pressure relief structure

Abstract

This application relates to the field of battery technology, and in particular to a battery with a directional pressure relief structure, comprising an electrode core, an insulating member, a piercing member, and a protective film. The insulating member is disposed on the side of the electrode core where no tabs are formed, the piercing member is mounted on the insulating member, and the protective film covers the outside of the assembly formed by the electrode core, the insulating member, and the piercing member. The insulating member has an exhaust hole arranged along a first preset direction, and the piercing member has a piercing portion on the side opposite to the electrode core. When the electrode core experiences thermal runaway and the gas production reaches a preset value, the high-pressure gas discharged through the exhaust hole can push the piercing member to move, causing the piercing portion to pierce the protective film. Therefore, this application provides a pouch battery with a directional pressure relief structure, enabling directional pressure relief from the non-tab side when the battery experiences thermal runaway, thus not affecting the electrical connection structure on the tab side, thereby reducing the likelihood of thermal runaway in other batteries and making it safer and more reliable.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery with a directional pressure relief structure. Background Technology

[0002] During the charging and discharging process of lithium-ion batteries, chemical reactions typically occur within the internal materials, generating a certain amount of high-pressure gas. When a lithium-ion battery malfunctions, a large amount of high-pressure gas is rapidly generated internally, causing a rapid increase in internal pressure and temperature, leading to thermal runaway and an explosion risk. Currently, aluminum-cased and cylindrical batteries usually have pressure relief valves on the cover to release pressure and reduce the risk of explosion. Pouch lithium-ion batteries, due to their simpler packaging structure, often have their top seal broken open to release pressure when internal pressure is high. However, this location is usually electrically connected to other pouch batteries, meaning there is a connection circuit. If a single battery in the module releases pressure, the ejected high-temperature, high-pressure gas and liquid may cause a fault in the connection circuit at the electrode tabs, potentially triggering thermal runaway in other pouch batteries. Utility Model Content

[0003] The purpose of this application is to provide a battery with a directional pressure relief structure, which to some extent solves the technical problem that existing soft-pack batteries often release pressure at the top seal of the aluminum-plastic film when internal thermal runaway occurs, and the ejected high-temperature and high-pressure gas and liquid may cause connection circuit failure at the tab, thereby causing thermal runaway in other soft-pack batteries.

[0004] This application provides a battery with a directional pressure relief structure, including: an electrode core, an insulating member, a puncture member, and a protective film; wherein, the insulating member is disposed on the side of the electrode core where no tab is formed, the puncture member is mounted on the insulating member, and the protective film covers the outside of the assembly formed by the electrode core, the insulating member, and the puncture member; The insulating member has an exhaust vent hole arranged along a first preset direction. The piercing member has a piercing portion on the side opposite to the electrode core. When the electrode core experiences thermal runaway and the gas production reaches a preset value, the high-pressure gas discharged through the exhaust vent hole can push the piercing member to move, causing the piercing portion to pierce the protective film.

[0005] In the above technical solution, the insulating member is further provided with a first buckle located on the side of the exhaust hole, the piercing member is provided with a snap-fit ​​interface, and the first buckle is snapped into the snap-fit ​​interface.

[0006] In any of the above technical solutions, further, along the first preset direction, a first snap-fit ​​position and a second snap-fit ​​position are formed between the first buckle and the card interface, and the first snap-fit ​​position is set closer to the electrode core side relative to the second snap-fit ​​position. When the electrode core experiences thermal runaway and the gas production reaches a preset value, the high-pressure gas can push the piercing member to move, so that the first buckle and the card interface change from the first snap-fit ​​position to the second snap-fit ​​position, and so that the piercing part pierces the protective film.

[0007] In any of the above technical solutions, the first latch further includes a first body and a first latching portion and a second latching portion connected to the first body; wherein, along the first preset direction, the first latching portion and the second latching portion are spaced apart, and the first latching portion is disposed near the pole core side, while the second latching portion is disposed away from the pole core side; the first latching portion cooperates with the side of the card interface near the pole core to form the first latching position, and the second latching portion cooperates with the side of the card interface near the pole core to form the second latching position.

[0008] In any of the above technical solutions, the battery with the directional pressure relief structure further includes a second buckle disposed on the side of the exhaust port, and the second buckle is snapped into the card interface; the second buckle includes a second body and a third snap-fit ​​part connected to the second body, and the third snap-fit ​​part and the first snap-fit ​​part are disposed flush along the first preset direction.

[0009] In any of the above technical solutions, each of the first buckles is further provided with a second buckle spaced apart along the circumference of the exhaust hole to form a buckle assembly, and the buckle assembly is installed in the same card interface, and along the circumference of the exhaust hole, the first buckle and the second buckle are respectively snapped onto opposite sides of the same card interface.

[0010] In any of the above technical solutions, the puncturing member is further provided with an installation notch, which is connected to the card interface and is used to avoid the second card connector when the second card connector is installed in the card interface.

[0011] In any of the above technical solutions, the piercing component further includes a main shell, an annular flange connected to the main shell, and the piercing portion; wherein the main shell is hollow inside and open at one end facing the pole core; The annular flange is disposed at one end of the main housing near the electrode core and along the outer periphery of the main housing, and the annular flange abuts against the insulating member; the snap-fit ​​interface is formed on the side wall of the main housing; the mounting notch is formed on the annular flange; the puncture portion is disposed at one end of the main housing away from the electrode core.

[0012] In any of the above technical solutions, the insulating member is further provided with an exhaust groove, the opening of the exhaust groove is disposed facing away from the electrode core, and the bottom wall of the exhaust groove near the electrode core is provided with an exhaust through hole and the first buckle, and the first buckle is disposed in the exhaust groove; the puncturing member is installed in the exhaust groove.

[0013] In any of the above technical solutions, the insulating component is further described as a rectangular groove structure.

[0014] In any of the above technical solutions, the number of the first buckles is multiple, and they are arranged sequentially at intervals along the outer periphery of the exhaust hole.

[0015] In any of the above technical solutions, the number of exhaust holes is multiple, and they are arranged sequentially at intervals along the length direction of the pole core, and each exhaust hole is equipped with the first buckle and the piercing member.

[0016] In any of the above technical solutions, the battery with the directional pressure relief structure further includes a bottom sealing protective film. The protective film has a mating through hole on its structure corresponding to the exhaust through hole. The bottom sealing protective film is fixed inside the protective film and covers the mating through hole.

[0017] In any of the above technical solutions, the battery with the directional pressure relief structure further includes an insulating film, which is detachably fixed to the outside of the protective film and covers the mating through hole. When thermal runaway occurs in the electrode core, high-pressure gas can apply pressure to the insulating film, causing it to detach from the protective film for venting. The insulating film and the protective film are detachably bonded together.

[0018] In any of the above technical solutions, the bottom sealing protective film is further connected to the protective film by hot melt adhesive.

[0019] In any of the above technical solutions, the puncture portion is a ring-shaped protrusion structure, and a blade is formed on the side facing the protective film.

[0020] In any of the above technical solutions, further, along the second preset direction, one end of the electrode core is formed with a tab, and the insulating member is installed on the other end of the electrode core opposite to the tab, and the first preset direction is arranged parallel to the second preset direction.

[0021] Compared with the prior art, the beneficial effects of this application are as follows: This application provides a novel soft-pack battery. An insulating component is installed on the side of the electrode core that does not have tabs, and a puncture component is installed on the insulating component. When thermal runaway occurs inside the electrode core and the pressure rises sharply, the internal air pressure causes the puncture component to move toward the protective film, thereby puncturing the protective film. This allows for pressure relief on the non-tab side, i.e., directional pressure relief, which does not affect the electrical connection structure on the tab side. This makes it less likely to cause thermal runaway in other batteries, making it safer and more reliable. Attached Figure Description To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 An exploded view of a battery with a directional pressure relief structure provided in an embodiment of this application; Figure 2 for Figure 1 A partially enlarged structural diagram; Figure 3 An assembly diagram of a battery with a directional pressure relief structure provided in an embodiment of this application; Figure 4 Another assembly diagram of a battery with a directional pressure relief structure provided in an embodiment of this application; Figure 5 A cross-sectional view of an assembly diagram of a battery with a directional pressure relief structure provided in an embodiment of this application; Figure 6 for Figure 5 A magnified structural diagram at point A; Figure 7 A partial assembly diagram of a battery with a directional pressure relief structure provided in an embodiment of this application; Figure 8 for Figure 7 A magnified structural diagram at point B; Figure 9 This is a schematic diagram of the structure of the insulating component provided in the embodiments of this application; Figure 10 for Figure 9A magnified structural diagram at point C; Figure 11 This is another structural schematic diagram of the insulating component provided in the embodiments of this application; Figure 12 This is a schematic diagram of the piercing component provided in an embodiment of this application; Figure 13 This is another structural schematic diagram of the piercing member provided in the embodiments of this application; Figure 14 Another structural schematic diagram of the piercing member provided in the embodiments of this application; Figure 15 This is another structural schematic diagram of the puncture member provided in the embodiments of this application.

[0023] Figure label: 1-Pole core, 11-First end, 12-Second end, 13-Pole tab, 2-Insulating component, 21-Exhaust groove, 22-Exhaust through hole, 23-First buckle, 231-First body, 232-First snap-fit ​​part, 233-Second snap-fit ​​part, 24-Second buckle, 241-Second body, 242-Third snap-fit ​​part, 25-Snap-fit ​​assembly, 3-Piercing component, 31-Main housing, 32-Annular flange, 33-Piercing part, 34-Mounting notch, 35-Snap-fit ​​interface, 4-Protective film, 41-Matching through hole, 5-First snap-fit ​​position, 6-Second snap-fit ​​position, 7-Bottom seal protective film, 8-Insulating film, 9-Hot melt adhesive, a-First preset direction. Detailed Implementation

[0024] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0025] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0026] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The following reference Figures 1 to 15 This application describes a battery with a directional pressure relief structure according to some embodiments.

[0030] See Figures 1 to 15 As shown, an embodiment of this application provides a battery with a directional pressure relief structure, including: an electrode core 1, an insulating member 2, a puncture member 3, and a protective film 4; wherein, the insulating member 2 is disposed on the side of the electrode core 1 where the tab 13 is not formed, the puncture member 3 is mounted on the insulating member 2, and the protective film 4 covers the outside of the assembly formed by the electrode core 1, the insulating member 2, and the puncture member 3. The insulating member 2 has an exhaust hole 22 arranged along the first preset direction a. During the charge and discharge cycle of the soft pack battery, it improves the electrolyte wettability of the soft pack battery with expansion and contraction, and provides an exhaust channel that can be used as a soft pack battery in case of thermal runaway. The piercing member 3 has a piercing part 33 formed on the side opposite to the electrode core 1. When the electrode core 1 experiences thermal runaway and the gas production reaches a preset value, the high-pressure gas discharged through the exhaust hole 22 can push the piercing member 3 to move, so that the piercing part 33 pierces the protective film 4.

[0031] As can be seen from the structure described above, this application provides a novel battery in which an insulating member 2 is installed on the side of the electrode core 1 that is not provided with tabs 13, and a puncturing member 3 is installed on the insulating member 2. When thermal runaway occurs inside the electrode core 1 and the pressure rises sharply, the internal air pressure causes the puncturing member 3 to move toward the protective film 4, thereby puncturing the protective film 4. This allows for pressure relief on the side other than tabs 13, i.e., directional pressure relief, which does not affect the electrical connection structure on the side of tabs 13. This makes it less likely to cause thermal runaway in other batteries, making the battery safer and more reliable.

[0032] Furthermore, preferably, the protective film 4 can be an existing aluminum-plastic film. Of course, it is not limited to this material and other materials can also be used, depending on the actual needs.

[0033] It should be noted that the exhaust direction during thermal runaway of the aforementioned electrode core 1 is the same as the first preset direction, and the exhaust direction changes with the first preset direction. That is, the exhaust direction changes depending on the location of the aforementioned directional exhaust structure, i.e., the directional pressure relief structure. For example, the first preset direction can be the height direction, length direction, or width direction of the electrode core 1, etc., and the specific direction can be selected according to actual needs.

[0034] Furthermore, it should be noted that the battery provided in this application is preferably a pouch lithium-ion battery, but it is not limited to this and other types of batteries may also be used. In one embodiment of this application, preferably, such as Figures 8 to 15 As shown, the insulating member 2 has a first buckle 23 located on the side of the exhaust hole 22, the piercing member 3 has a snap-fit ​​interface 35, and the first buckle 23 is snapped into the snap-fit ​​interface 35. As can be seen from the structure described above, by setting a first buckle 23 on the insulating component 2 and a locking interface 35 on the piercing component 3, the piercing component 3 can be installed on the insulating component 2 through the cooperation of the first buckle 23 and the locking interface 35. Moreover, it is a detachable structure. In particular, when the electrode core 1 experiences thermal runaway, the high-pressure gas can push the locking interface 35 of the piercing component 3 to move relative to the first buckle 23. Furthermore, it is also easy to adjust during the initial assembly of the piercing component 3 and the insulating component 2.

[0035] It should be noted that the connection between the puncturing component 3 and the insulating component 2 is not limited to this. They can also be connected by adhesive or other methods. When the high-pressure gas pressure is high enough, the puncturing component 3 can be forced to move toward the protective film 4, thereby puncturing the protective film 4 and releasing pressure.

[0036] In one embodiment of this application, preferably, as Figure 8As shown, along the first preset direction a, a first latching position 5 and a second latching position 6 are formed between the first latch 23 and the latching interface 35 with a gap. The first latching position 5 is set closer to the pole core 1 than the second latching position 6. When the pole core 1 experiences thermal runaway and the gas production reaches a preset value, the high-pressure gas can push the piercing member 3 to move, so that the first latch 23 and the latching interface 35 change from the first latching position 5 to the second latching position 6, and so that the piercing part 33 pierces the protective film 4. As can be seen from the structure described above, when the electrode core 1 is in a normal state, that is, when thermal runaway does not occur, the first latch 23 and the latch interface 35 are in the first latching position 5. At this time, the piercing component 3 will not move and pierce the protective film 4. When the electrode core 1 is in thermal runaway, the high-pressure gas will push the piercing component 3 to move, so that the first latch 23 and the latch interface 35 are in the second latching position 6. At this time, the piercing part 33 of the piercing component 3 can just pierce the aluminum-plastic film, and even cause the aluminum-plastic film in this area to fall off, thereby realizing directional exhaust on the non-electrode tab 13 side. Moreover, the piercing component 3 will not detach from the insulating component 2 and fall out of the aluminum-plastic film, which is safer and more reliable. In one embodiment of this application, preferably, as Figure 8 and Figure 10 As shown, the first latch 23 includes a first body 231 and a first latching portion 232 and a second latching portion 233 connected to the first body 231; wherein, along the first preset direction a, the first latching portion 232 and the second latching portion 233 are spaced apart, and the first latching portion 232 is disposed near the pole core 1, and the second latching portion 233 is disposed away from the pole core 1; the first latching portion 232 cooperates with the side of the card interface 35 near the pole core 1 to form a first latching position 5, and the second latching portion 233 cooperates with the side of the card interface 35 near the pole core 1 to form a second latching position 6. As can be seen from the structure described above, the first latching part 232 and the second latching part 233 are connected together through the first body 231. Under the action of high pressure gas, the movement of the first latching part 232 in cooperation with the edge of the card interface 35 is transformed into the cooperation of the second latching part 233 with the edge of the card interface 35, realizing linkage and meeting the usage requirements. Moreover, the first latching part 232 and the second latching part 233 are connected together through the first body 231, resulting in higher overall strength.

[0037] In one embodiment of this application, preferably, as Figure 8 and Figure 10 As shown, the battery with the directional pressure relief structure also includes a second buckle 24 disposed on the side of the exhaust hole 22, and the second buckle 24 is snapped into the card interface 35; the second buckle 24 includes a second body 241 and a third snap-fit ​​part 242 connected to the second body 241, and the third snap-fit ​​part 242 and the first snap-fit ​​part 232 are flush along the first preset direction a. As can be seen from the structure described above, a second buckle 24 is provided on the basis of the first buckle 23 to ensure the stability and firmness of the assembly between the piercing component 3 and the insulating component 2 when the pole core 1 does not experience thermal runaway. It is not easy for the piercing component 3 to move relative to the insulating component 2 and accidentally pierce the protective film 4. Moreover, the second buckle 24 only includes the third snap-fit ​​part 242 and does not have a fourth snap-fit ​​part, which is the same as the second snap-fit ​​part 233 of the first buckle 23. This structure is simpler, easier to process and manufacture, and easier to install into the snap-fit ​​interface 35, avoiding interference.

[0038] In one embodiment of this application, preferably, as Figure 8 and Figure 10 As shown, each of the first buckles 23 is equipped with a second buckle 24 that is circumferentially spaced along the exhaust hole 22 to form a buckle assembly 25, and the buckle assembly 25 is installed in the same card interface 35. As can be seen from the structure described above, the first buckle 23 and the second buckle 24 are installed as a set of buckle components 25 in the same card interface 35, which simplifies the structure and facilitates processing, manufacturing and installation.

[0039] In one embodiment of this application, preferably, as Figure 8 , Figures 12 to 14 As shown, the puncture member 3 has an installation notch 34, which is connected to the card interface 35 and is used to avoid the second card interface 233 when the second card interface 233 is installed in the card interface 35. Along the circumference of the exhaust hole 22, the first buckle 23 and the second buckle 24 are respectively engaged on opposite sides of the same card interface 35. As can be seen from the structure described above, when the buckle assembly 25 is assembled with the card interface 35, the second snap-fit ​​part 233 of the first buckle 23 is first aligned with the mounting notch 34, and the second snap-fit ​​part 233 is first installed into the card interface 35 through the mounting notch 34. Then, the first body 231 and the first snap-fit ​​part 232 are also installed into the mounting notch 34. Then, the insulating member 2 is rotated, so that the second buckle 24 of the same group is also screwed into the same card interface 35, so that the first buckle 23 and the second buckle 24 are respectively snapped on opposite sides of the circumference along the exhaust hole 22 of the same card interface 35, thereby playing a role in stabilizing and fixing the piercing member 3. That is, when the electrode core 1 is in normal use, that is, when thermal runaway has not occurred, the piercing member 3 will not move relative to the insulating member 2 along the first preset direction a, that is, the exhaust direction, so as not to accidentally pierce the protective film 4. Furthermore, preferably, this application provides two sets of snap-fit ​​components 25, and correspondingly provides two card interfaces 35, each card interface 35 being equipped with an installation notch 34. Of course, it is not limited to this; one or more sets of snap-fit ​​components 25 may also be provided. It should also be noted that the second snap-fit ​​24 and the first snap-fit ​​23 may not appear in pairs, and the number of the first snap-fit ​​23 and the second snap-fit ​​24 may be one or more, depending on the actual needs.

[0040] In addition, it should be noted that: it is also possible to set only the first buckle 23 and not the second buckle 24, depending on the actual needs.

[0041] In one embodiment of this application, preferably, as Figure 8 , Figures 12 to 15 As shown, the piercing component 3 includes a main shell 31 and an annular flange 32 and a piercing part 33 connected to the main shell 31; wherein, the main shell 31 is a structure that is hollow inside and open at one end facing the pole core 1; An annular flange 32 is disposed at one end of the main housing 31 near the pole core 1 and is disposed along the outer periphery of the main housing 31, and the annular flange 32 abuts against the insulating member 2; a card interface 35 is formed on the side wall of the main housing 31; an installation notch 34 is formed on the annular flange 32; and a puncture part 33 is disposed at one end of the main housing 31 away from the pole core 1. As described above, the annular flange 32 abuts against the bottom wall of the venting groove 21 of the insulating component 2, increasing the contact area between the two and improving the support effect on the piercing component 3. The main shell 31 serves as the main body supporting the piercing part 33, and its hollow internal structure contributes to lightweight design and material cost savings. It also facilitates the opening of the card interface 35, and its hollow interior avoids interference with the first buckle 23 and the second buckle 24. The piercing part 33 is mainly used to pierce the protective film 4 to release air when the core 1 experiences thermal runaway. Of course, the structure of the piercing component 3 is not limited to the above and can be designed according to actual needs.

[0042] In one embodiment of this application, preferably, as Figure 2 As shown, the insulating member 2 has an exhaust groove 21, and the opening of the exhaust groove 21 is arranged facing away from the pole core 1. The bottom wall of the exhaust groove 21 near the pole core 1 has an exhaust through hole 22, a first buckle 23 and a second buckle 24, and the first buckle 23 and the second buckle 24 are both arranged in the exhaust groove 21. The piercing member 3 is installed in the exhaust groove 21. As can be seen from the structure described above, the venting groove 21 provides space for the first buckle 23, the second buckle 24 and the piercing member 3, avoiding interference with other structural components. Moreover, the venting groove 21 can vent during thermal runaway. Of course, the venting groove 21 may not be provided on the insulating member 2, depending on the actual needs. In one embodiment of this application, preferably, as Figure 2 As shown, the insulating component 2 is a rectangular groove structure, which matches the shape of the pole core 1, meeting the requirements for large-area insulation and venting. Of course, it is not limited to this; its shape can also be designed according to actual needs. In one embodiment of this application, preferably, as Figure 9 As shown, there are multiple first buckles 23, which are arranged sequentially at intervals along the outer periphery of the vent hole 22. As can be seen from the structure described above, multiple first buckles 23 are set along the outer periphery of the exhaust hole 22. This ensures that when the electrode core 1 is in normal working condition, the piercing component 3 is not likely to move relative to the insulating component 2 and accidentally pierce the protective film 4. Moreover, when the electrode core 1 experiences thermal runaway and the piercing component 3 moves relative to the insulating component 2 and pierces the protective film 4 to exhaust gas, it will not completely separate from the insulating component 2 and fall out of the protective film 4, making it safer and more reliable.

[0043] Of course, it's not limited to this; you can also set a first buckle 23, depending on your actual needs. In one embodiment of this application, preferably, as Figure 9 and Figure 11 As shown, there are multiple exhaust holes 22, which are arranged sequentially at intervals along the length of the pole core 1, and each exhaust hole 22 is equipped with a first buckle 23 and a piercing member 3, forming multiple directional exhaust structures. As described above, multiple directional exhaust structures are arranged along the length of the core 1 to improve the uniformity of exhaust during thermal runaway. Of course, this is not the only option; a single directional exhaust structure may also be used, depending on the specific needs.

[0044] In one embodiment of this application, preferably, as Figure 2 and Figure 6 As shown, the battery with the directional pressure relief structure also includes a bottom sealing protective film 7. The protective film 4 has a mating through hole 41 on its structure corresponding to the exhaust through hole 22. The bottom sealing protective film 7 is fixed inside the protective film 4 and covers the mating through hole 41. As described above, a mating through-hole 41 is pre-formed on the protective film 4 corresponding to the exhaust through-hole 22, and a bottom sealing protective film 7 is then installed on the inner side of this location. This assembled structure is easier to puncture than a one-piece protective film 4 structure, facilitating exhaust during thermal runaway of the electrode core 1. Furthermore, this structure brings the bottom sealing protective film 7 closer to the puncturing member 3, thus reducing the distance of the puncturing member 3 and making it easier to puncture the bottom sealing protective film 7 during thermal runaway of the electrode core 1. Moreover, this combined structure is easier to puncture than a one-piece protective film 4 structure. Of course, the aforementioned mating through-hole 41 and bottom sealing protective film 7 can also be omitted from the protective film 4, allowing the puncturing member 3 to directly puncture and / or cut the protective film 4, depending on actual needs. Alternatively, the protective film 4 can be pressed towards the electrode core 1 side, causing it to protrude corresponding to the puncturing member 3. In one embodiment of this application, preferably, as Figure 2 , Figure 3 and Figure 6 As shown, the battery with a directional pressure relief structure also includes an insulating film 8, which is detachably fixed to the outside of the protective film 4 and seals the mating through hole 41 to ensure external insulation, making it safer and more reliable. Furthermore, when thermal runaway occurs in the electrode core 1, high-pressure gas can apply pressure to the insulating film 8, causing it to detach from the protective film 4 for gas release. Of course, the insulating film 8 can be omitted, depending on actual needs.

[0045] Furthermore, preferably, the insulating film 8 and the protective film 4 are detachably bonded together, and the insulating film 8 is relatively thin, making it extremely easy to tear off under the action of high-pressure gas without affecting the exhaust. This will be understood by those skilled in the art and will not be described in detail here. Furthermore, preferably, the insulating film 8 is a circular film, but of course, it is not limited to this and can also be a film of other shapes.

[0046] Furthermore, preferably, the insulating film 8 is made of PET, i.e., saturated polyester, to meet the usage requirements; however, it is not limited to this. In one embodiment of this application, preferably, as... Figures 1 to 3 As shown, the bottom sealing protective film 7 and the protective film 4 are connected by hot melt adhesive 9 to ensure the airtightness of the opening of the soft-pack battery, and it is easy to operate, which helps to improve production efficiency. Of course, it is not limited to this. Furthermore, preferably, the bottom sealing protective film 7 is a circular film, and correspondingly, the hot melt adhesive 9 is a ring-shaped adhesive. Of course, it is not limited to this. The bottom sealing protective film 7 can also be other shapes, and the hot melt adhesive 9 can also be other ring structures, depending on the actual needs.

[0047] Furthermore, preferably, the material of the bottom sealing protective film 7 can be the same as that of the protective film 4, for example, both can be aluminum-plastic film. Of course, it is not limited to this, and other materials can also be used. In addition, the material of the bottom sealing protective film 7 can also be different from that of the protective film 4.

[0048] In one embodiment of this application, preferably, as Figure 8 As shown, the puncture part 33 is an annular protrusion structure, and a blade is formed on the side facing the protective film 4. As described above, the puncture part 33 has a ring-shaped structure and a cutting edge on the side facing the protective film 4. This allows a portion of the protective film 4 to be cut off, forming a venting hole for rapid pressure relief and exhaust. Alternatively, the puncture part 33 can also be part of a ring-shaped structure. In this case, there can be one or more puncture parts 33, and when there are multiple puncture parts, they are arranged sequentially at intervals around the outer periphery of the venting hole 22. This is just one example; the puncture part 33 can also adopt other shapes.

[0049] In addition, it should be noted that the protective film 4 can be punctured by the puncture part 33 without being cut off. The connected parts can be torn off later by high pressure gas. Of course, even if the high pressure cannot tear off the connected parts, it is also possible to release air through the punctured area. The specific choice depends on the actual needs. In one embodiment of this application, preferably, as Figure 1 As shown, along the second preset direction, a tab 13 is formed at one end of the electrode core 1, and an insulating member 2 is installed on the other end of the electrode core 1 opposite to the tab 13. The first preset direction a is parallel to the second preset direction. It can be seen that along the second preset direction, the two opposite ends of the electrode core 1 are the first end 11 and the second end 12, respectively. The first end 11 has a tab 13, while the second end 12 does not have a tab 13. Generally, the high-pressure gas generated when the electrode core 1 experiences thermal runaway tends to be ejected towards these two ends along the second preset direction. Therefore, this application chooses to install a directional exhaust structure at the second end 12, that is, the end without a tab 13. In this way, exhaust can be released from the second end 12 without affecting the electrical connection structure connecting the first end 11 and the tab 13. Then, the thermal runaway can be propagated to other batteries through the electrical connection structure, which can effectively prevent other batteries from experiencing thermal runaway.

[0050] Furthermore, preferably, the second preset direction is the height direction of the electrode core 1. Of course, it is not limited to this and can be designed according to actual needs. That is to say, the second preset direction is the same as the direction of the lead-out electrode 13 and can change with the actual lead-out direction of the electrode 13.

[0051] It should be noted that the directional exhaust structure is not limited to the end opposite to the tab 13, i.e., the aforementioned second end 12. It can also be provided on at least one side of the electrode core 1 along a direction perpendicular to the second preset direction, such as the length direction of the electrode core 1. Alternatively, the directional exhaust structure can be provided on both the second end 12 of the electrode core 1 along the second preset direction and on at least one side of the electrode core 1 along a direction perpendicular to the second preset direction. The specific choice depends on the actual needs.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery having a directional pressure relief structure, characterized by, include: An electrode core, an insulating component, a piercing component, and a protective film; wherein the insulating component is disposed on the side of the electrode core where no electrode tab is formed, the piercing component is mounted on the insulating component, and the protective film covers the outside of the assembly formed by the electrode core, the insulating component, and the piercing component; The insulating member has an exhaust vent hole arranged along a first preset direction. The piercing member has a piercing portion on the side opposite to the electrode core. When the electrode core experiences thermal runaway and the gas production reaches a preset value, the high-pressure gas discharged through the exhaust vent hole can push the piercing member to move, causing the piercing portion to pierce the protective film.

2. The battery having a directional pressure relief structure according to claim 1, characterized by, The insulating member has a first buckle located on the side of the exhaust hole, the piercing member has a snap-fit ​​interface, and the first buckle snaps into the snap-fit ​​interface.

3. The battery having a directional pressure relief structure according to claim 2, characterized by, Along the first preset direction, a first latching position and a second latching position are formed between the first latch and the card interface, and the first latching position is set closer to the electrode core side relative to the second latching position. When the electrode core experiences thermal runaway and the gas production reaches a preset value, the high-pressure gas can push the piercing member to move, so that the first latch and the card interface change from the first latching position to the second latching position, and so that the piercing part pierces the protective film.

4. The battery with a directional pressure relief structure according to claim 3, characterized in that, The first latch includes a first body and a first latching portion and a second latching portion connected to the first body; wherein, along the first preset direction, the first latching portion and the second latching portion are spaced apart, and the first latching portion is disposed closer to the pole core side, while the second latching portion is disposed away from the pole core side; the first latching portion cooperates with the side of the card interface closer to the pole core to form the first latching position, and the second latching portion cooperates with the side of the card interface closer to the pole core to form the second latching position.

5. The battery with a directional pressure relief structure according to claim 4, characterized in that, The battery with a directional pressure relief structure further includes a second buckle disposed on the side of the vent hole, and the second buckle is snapped into the buckle interface; the second buckle includes a second body and a third snap-fit ​​part connected to the second body, and the third snap-fit ​​part and the first snap-fit ​​part are flush along the first preset direction.

6. The battery with a directional pressure relief structure according to claim 5, characterized in that, Each of the first buckles is provided with a second buckle spaced circumferentially along the exhaust vent to form a buckle assembly. The buckle assembly is installed in the same card interface, and along the circumferential direction of the exhaust vent, the first buckle and the second buckle are respectively engaged on opposite sides of the same card interface.

7. The battery with a directional pressure relief structure according to claim 4, characterized in that, The puncturing member has an installation notch that communicates with the card interface and is used to avoid the second card connector when the second card connector is installed in the card interface.

8. The battery with a directional pressure relief structure according to claim 7, characterized in that, The piercing component includes a main housing, an annular flange connected to the main housing, and the piercing portion; wherein, the main housing is hollow inside and open at one end facing the pole core; The annular flange is disposed at one end of the main housing near the electrode core and along the outer periphery of the main housing, and the annular flange abuts against the insulating member; the snap-fit ​​interface is formed on the side wall of the main housing; the mounting notch is formed on the annular flange; the puncture portion is disposed at one end of the main housing away from the electrode core.

9. The battery with a directional pressure relief structure according to claim 2, characterized in that, The insulating member has an exhaust groove, and the opening of the exhaust groove is oriented away from the pole core. The bottom wall of the exhaust groove near the pole core has an exhaust through hole and the first buckle, and the first buckle is disposed in the exhaust groove. The puncturing member is installed in the exhaust groove.

10. The battery with a directional pressure relief structure according to claim 9, characterized in that, The insulating component is a rectangular groove structure.

11. The battery with a directional pressure relief structure according to claim 2, characterized in that, The number of the first clips is multiple, and they are arranged sequentially at intervals along the outer periphery of the vent hole; and / or The number of exhaust holes is multiple, and they are arranged sequentially at intervals along the length of the pole core. Each exhaust hole is equipped with the first buckle and the piercing member.

12. The battery with a directional pressure relief structure according to claim 1, characterized in that, The battery with a directional pressure relief structure also includes a bottom sealing protective film. The protective film has a mating through hole on its structure corresponding to the exhaust through hole. The bottom sealing protective film is fixed inside the protective film and covers the mating through hole.

13. The battery with a directional pressure relief structure according to claim 12, characterized in that, The battery with a directional pressure relief structure further includes an insulating film, which is detachably fixed to the outside of the protective film and seals the mating through-hole. When thermal runaway occurs in the electrode core, high-pressure gas can apply pressure to the insulating film, causing it to detach from the protective film for venting. The insulating film is detachably bonded to the protective film; and / or The bottom sealing protective film is connected to the protective film by hot melt adhesive.

14. The battery with a directional pressure relief structure according to any one of claims 1 to 13, characterized in that, The puncture portion is an annular protrusion structure, and a blade is formed on the side facing the protective film; and / or Along the second preset direction, a tab is formed at one end of the electrode core, and the insulating member is installed on the other end of the electrode core opposite to the tab, and the first preset direction is parallel to the second preset direction.

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