Battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell which comprises a cover plate, a first insulating part and an anti-explosion valve, wherein the anti-explosion valve and the first insulating part are both installed on the cover plate, and in the first preset direction, the first insulating part is arranged close to the pole group side, and the anti-explosion valve is arranged away from the pole group side; in the first preset direction, a turbulent flow area corresponding to the anti-explosion valve is formed in the first insulating part, and a plurality of turbulent flow through holes are formed in the turbulent flow area. According to the protection structure of the explosion-proof valve of the battery cell provided by the invention, the plurality of turbulent flow through holes are formed in the first insulating part, so that the impact pressure from an electrolyte can be relieved, evacuated and turbulent flow under the condition of ensuring normal exhaust when the battery cell is in thermal runaway, thereby greatly reducing the impact effect of the electrolyte and improving the safety of the battery cell. The problems of abnormal cracking, liquid leakage and the like of the explosion-proof valve are solved, and the safety and the reliability of the battery cell in the use process are improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to an electric core. Background Art

[0002] At present, the explosion-proof valve can be designed on the cover plate or the housing of the electric core. Its main function is to relieve pressure and exhaust gas, and is used for the directional release of high-temperature and high-pressure gas inside the electric core when the electric core undergoes thermal runaway due to mechanical impact, abnormal internal short circuit, etc., thereby improving the safety performance of the battery pack. However, during the use of the electric core, especially in cases such as vibration, impact, and drop, there is often a problem that the electrolyte inside the electric core impacts the explosion-proof valve, resulting in problems such as rupture and liquid leakage of the explosion-proof valve. Utility Model Content

[0003] The purpose of the present application is to provide an electric core, which to a certain extent solves the technical problem in the prior art that during the use of the electric core, especially in cases such as vibration, impact, and drop, there is often a problem that the electrolyte inside the electric core impacts the explosion-proof valve, resulting in problems such as rupture and liquid leakage of the explosion-proof valve.

[0004] The present application provides an electric core, including: a cover plate, a first insulating member, and an explosion-proof valve; wherein, the explosion-proof valve and the first insulating member are both installed on the cover plate, and along a first preset direction, the first insulating member is arranged closer to the pole group side, and the explosion-proof valve is arranged farther from the pole group side; along the first preset direction, the first insulating member forms a flow disturbance area corresponding to the explosion-proof valve, and a plurality of flow disturbance through holes are formed in the flow disturbance area.

[0005] In the above technical solution, further, along a second preset direction, the length dimension of the flow disturbance area is a2, the length dimension of the explosion-proof valve is a1, and 0.5 ≤ a2 - a1 ≤ 2 mm.

[0006] In any of the above technical solutions, further, along a third preset direction, the width dimension of the flow disturbance area is b2, the width dimension of the explosion-proof valve is b1, and 0.5 ≤ b2 - b1 ≤ 2 mm.

[0007] In any of the above technical solutions, further, the total opening area of all the flow disturbance through holes is S1, the total area of the flow disturbance area is S, and 40% ≤ S1 / S ≤ 70%.

[0008] The present application provides an electric core, including: a cover plate, a first insulating member, an end plate, and an explosion-proof valve; wherein, the explosion-proof valve and the first insulating member are both installed on the cover plate, and along a first preset direction, the first insulating member is arranged closer to the pole group side, the explosion-proof valve is arranged farther from the pole group side, and the end plate is installed between the first insulating member and the pole group;

[0009] Along the first preset direction, the first insulating member is formed with an exhaust through-hole corresponding to the explosion-proof valve, the end plate is formed with a flow disturbance area corresponding to the explosion-proof valve, and a plurality of flow disturbance through-holes are formed in the flow disturbance area.

[0010] In the above technical solution, further, the end plate is formed with an exhaust groove, and the exhaust groove is the flow disturbance area, and flow disturbance rib plates are arranged in the exhaust groove.

[0011] In any of the above technical solutions, further, along the second preset direction, the length dimension of the flow disturbance area is a2, the length dimension of the explosion-proof valve is a1, and 0.5 ≤ a3 - a1 ≤ 2 mm.

[0012] In any of the above technical solutions, further, along the third preset direction, the width dimension of the flow disturbance area is b2, the width dimension of the explosion-proof valve is b1, and 0.5 ≤ b3 - b1 ≤ 2 mm.

[0013] In any of the above technical solutions, further, along the second preset direction, the length dimension of the exhaust through-hole is a3, the length dimension of the explosion-proof valve is a1, and 0.5 ≤ a3 - a1 ≤ 1 mm.

[0014] In any of the above technical solutions, further, along the third preset direction, the width dimension of the exhaust through-hole is b3, the width dimension of the explosion-proof valve is b1, and 0.5 ≤ b3 - b1 ≤ 1 mm.

[0015] The present application provides an electric core, including: a housing, a pole group, a side plate, an insulating sheet, and an explosion-proof valve; wherein, the side plate is installed on the side of the pole group, and the insulating sheet is coated on the outside of the assembly of the pole group and the side plate and is integrally installed in the housing; the explosion-proof valve is installed on the side of the housing, and the explosion-proof valve, a partial structure of the insulating sheet, and the side plate are sequentially arranged along a fourth preset direction;

[0016] The side plate is formed with an exhaust through-hole, the insulating sheet is formed with a plurality of flow disturbance through-holes, and along the fourth preset direction, the explosion-proof valve, the exhaust through-hole, and the plurality of flow disturbance through-holes are correspondingly arranged.

[0017] In the above technical solution, further, the plurality of flow disturbance through-holes are sequentially and spaced in a row along the length direction of the explosion-proof valve. Among them, the diameter dimension of the flow disturbance through-hole is d, the width dimension of the explosion-proof valve is w, and 20% ≤ d / w ≤ 50%.

[0018] In any of the above technical solutions, further, the side plate is installed on the narrow surface side of the pole group, and the explosion-proof valve is installed on the narrow surface side of the housing.

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

[0020] The present application provides a protection structure for the explosion-proof valve of an electric core. A plurality of flow-disturbing through-holes are provided on the first insulating member, that is, the lower plastic or the end plate of the electrode group. While ensuring normal exhaust during thermal runaway of the electric core, it can relieve, disperse, and disturb the impact pressure from the electrolyte, thereby greatly reducing the occurrence of problems such as abnormal cracking and liquid leakage of the explosion-proof valve caused by the impact of the electrolyte, and improving the safety and reliability during the use of the electric core. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order 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.

[0022] Figure 1 It is an explosion diagram of the cover plate and the first insulating member provided in the first embodiment of the present application;

[0023] Figure 2 It is another explosion diagram of the cover plate and the first insulating member provided in the first embodiment of the present application;

[0024] Figure 3 It is a schematic structural diagram of the first insulating member provided in the first embodiment of the present application;

[0025] Figure 4 It is an explosion diagram of the cover plate and the first insulating member provided in the second embodiment of the present application;

[0026] Figure 5 It is an explosion diagram of the electric core provided in the third embodiment of the present application.

[0027] Reference Numerals:

[0028] 1 - Cover plate, 101 - Mounting through-hole, 2 - First insulating member, 3 - Explosion-proof valve, 4 - End plate, 5 - Housing, 6 - Electrode group, 7 - Side plate, 8 - Insulating sheet, 9 - Flow-disturbing area, 10 - Flow-disturbing through-hole, 11 - Flow-disturbing rib plate, 12 - Exhaust through-hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following will clearly and completely describe the technical solutions of the present application with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0030] The components of the embodiments of the present application that are typically depicted and shown in the accompanying drawings herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application as claimed, but merely represents selected embodiments of the present application.

[0031] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0032] 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 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 thus should not be construed as a limitation of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0033] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may 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 circumstances.

[0034] The following refers to Figures 1 to 5 Describe the battery cell according to some embodiments of the present application.

[0035] Embodiment 1

[0036] Referring to Figures 1 to 3 As shown, the embodiments of the present application provide a battery cell, including: a cover plate 1, a first insulating member 2, and an explosion-proof valve 3; wherein, both the explosion-proof valve 3 and the first insulating member 2 are mounted on the cover plate 1, and along a first preset direction, the first insulating member 2 is disposed closer to the electrode group 6 side, and the explosion-proof valve 3 is disposed farther from the electrode group 6 side; along the first preset direction, the first insulating member 2 is formed with a turbulent flow area 9 corresponding to the explosion-proof valve 3, and the turbulent flow area 9 is formed with a plurality of turbulent flow through holes 10.

[0037] According to the structure described above, the present application provides a protection structure for the explosion-proof valve of an electric core. A plurality of flow-disturbing through-holes 10 are provided on a first insulating member 2, such as plastic. While ensuring normal exhaust during thermal runaway of the electric core, it can relieve, disperse, and disturb the impact pressure from the electrolyte, thereby greatly reducing the occurrence of problems such as abnormal cracking and liquid leakage of the explosion-proof valve 3 caused by the impact of the electrolyte, and improving the safety and reliability during the use of the electric core.

[0038] Further, preferably, the cover plate 1 is formed with an installation through-hole 101, and the explosion-proof valve 3 is installed in this installation through-hole 101. And preferably, the explosion-proof valve 3 is adapted to this installation through-hole 101, and the size of this installation through-hole 101 is the same as the size of the explosion-proof valve 3. Therefore, the size of the explosion-proof valve 3 can be represented by the size of the installation through-hole 101.

[0039] In this embodiment, preferably, as Figure 2 shown, along the second preset direction, the length dimension of the flow-disturbing area 9 is a2, the length dimension of the explosion-proof valve 3 is a1, and 0.5 ≤ a2 - a1 ≤ 2 mm.

[0040] According to the structure described above, while ensuring buffering and disturbing the electrolyte, it has sufficient exhaust length and does not affect exhaust.

[0041] In this embodiment, preferably, as Figure 2 shown, along the third preset direction, the width dimension of the flow-disturbing area 9 is b2, the width dimension of the explosion-proof valve 3 is b1, and 0.5 ≤ b2 - b1 ≤ 2 mm.

[0042] According to the structure described above, while ensuring buffering and disturbing the electrolyte, it has sufficient exhaust width and does not affect exhaust.

[0043] In this embodiment, preferably, as Figure 2 shown, the total opening area sum of all the flow-disturbing through-holes 10 is S1, the total area of the flow-disturbing area 9 is S, and 40% ≤ S1 / S ≤ 70%.

[0044] According to the structure described above, if the opening area ratio of the flow-disturbing area 9 is less than 40%, it will affect the smooth discharge of the gas inside the electric core; if the opening area ratio of the flow-disturbing area 9 is greater than 70%, there will be insufficient flow disturbance, and the electrolyte will impact the explosion-proof valve 3, which cannot play a role in protecting the explosion-proof valve 3. Therefore, controlling the opening area ratio of the flow-disturbing area 9 between 40% and 70% can not only not affect the exhaust effect of the explosion-proof valve 3, but also play a role in buffering and disturbing the electrolyte.

[0045] In this embodiment, preferably, as Figure 1 and Figure 2As shown, the first insulating member 2 is formed with exhaust grooves, and the exhaust grooves are the aforementioned turbulent flow areas 9, which have the function of buffering and exhausting. Of course, it is not limited to this. Instead of setting exhaust grooves on the first insulating member 2, the turbulent flow area 9 can also be directly set in the flat plate area, etc., and it is specifically selected according to actual needs.

[0046] Further, preferably, turbulator ribs 11 can also be arranged in the exhaust grooves, that is, in the turbulent flow area 9. On the one hand, it plays a role in increasing strength, and on the other hand, it plays a role in disturbing the flow. Moreover, the turbulator ribs 11 are arranged in the exhaust grooves and do not protrude from the end plate 4, so that they will not interfere with structures such as the first insulating member 2, ensuring the assembly accuracy and efficiency. Of course, the turbulator ribs 11 can also not be provided, and it is specifically selected according to actual needs.

[0047] Further, preferably, the turbulator ribs 11 extend along the third preset direction, that is, the width direction of the explosion-proof valve 3, to ensure the exhaust area. Of course, it is not limited to this. The turbulator ribs 11 can also extend along the first preset direction, that is, the length direction of the explosion-proof valve 3, or be arranged along other directions, and it is specifically selected according to actual needs.

[0048] Embodiment 2

[0049] See Figure 4 As shown, an embodiment of the present application provides an electric core, including: a cover plate 1, a first insulating member 2, an end plate 4, and an explosion-proof valve 3; wherein, the explosion-proof valve 3 and the first insulating member 2 are both installed on the cover plate 1, and along the first preset direction, the first insulating member 2 is arranged closer to the pole group 6 side, the explosion-proof valve 3 is arranged farther from the pole group 6 side, and the end plate 4 is installed between the first insulating member 2 and the pole group 6;

[0050] Along the first preset direction, the first insulating member 2 is formed with an exhaust through hole 12 corresponding to the explosion-proof valve 3, the end plate 4 is formed with a turbulent flow area 9 corresponding to the explosion-proof valve 3, and the turbulent flow area 9 is formed with a plurality of turbulent flow through holes 10.

[0051] According to the structure described above, the present application provides a protection structure for the explosion-proof valve of an electric core. By setting a plurality of turbulent flow through holes 10 on the lower plastic, it can relieve, disperse, and disturb the impact pressure from the electrolyte while ensuring normal exhaust during the thermal runaway of the electric core, thereby greatly reducing the occurrence of problems such as abnormal cracking and liquid leakage of the explosion-proof valve 3 caused by the impact of the electrolyte, and improving the safety and reliability during the use of the electric core.

[0052] Further, preferably, the cover plate 1 is formed with a mounting through hole 101, and the explosion-proof valve 3 is installed in this mounting through hole 101. Preferably, the explosion-proof valve 3 is adapted to this mounting through hole 101, and the size of this mounting through hole 101 is the same as the size of the explosion-proof valve 3. Therefore, the size of the mounting through hole 101 can be used to represent the size of the explosion-proof valve 3.

[0053] In this embodiment, preferably, as Figure 4 shown, the end plate 4 is formed with exhaust grooves, and the exhaust grooves are the aforementioned flow disturbance areas 9, and flow disturbance rib plates 11 are arranged in the exhaust grooves, which on the one hand play a role in increasing the strength, and on the other hand play a role in disturbing the flow. Moreover, the flow disturbance rib plates 11 are arranged in the exhaust grooves and do not protrude from the end plate 4, so as not to interfere with structures such as the first insulating member 2 and ensure the assembly accuracy and efficiency.

[0054] Further, preferably, the flow disturbance rib plates 11 extend along the third preset direction described below, that is, the width direction of the explosion-proof valve 3, to ensure the exhaust area. Of course, it is not limited to this. The flow disturbance rib plates 11 can also extend along the first preset direction described below, that is, the length direction of the explosion-proof valve 3, or be arranged along other directions, and are specifically selected according to actual needs. In addition, the flow disturbance rib plates 11 may not be provided.

[0055] In this embodiment, preferably, as Figure 4 shown, along the second preset direction, the length dimension of the flow disturbance area 9 is a2, the length dimension of the explosion-proof valve 3 is a1, and 0.5 ≤ a3 - a1 ≤ 2 mm.

[0056] According to the structure described above, while ensuring buffering and disturbing the electrolyte, there is sufficient exhaust length and the exhaust is not affected.

[0057] In this embodiment, preferably, as Figure 4 shown, along the third preset direction, the width dimension of the flow disturbance area 9 is b2, the width dimension of the explosion-proof valve 3 is b1, and 0.5 ≤ b3 - b1 ≤ 2 mm.

[0058] According to the structure described above, while ensuring buffering and disturbing the electrolyte, there is sufficient exhaust width and the exhaust is not affected.

[0059] Further, preferably, the total opening area of all the flow-through holes 10 is S1, the total area of the flow disturbance area 9 is S, and 40% ≤ S1 / S ≤ 70%. It can be seen that if the proportion of the opening area of the flow disturbance area 9 is less than 40%, it will affect the smooth discharge of the gas inside the battery cell; if the proportion of the opening area of the flow disturbance area 9 is greater than 70%, there will be insufficient flow disturbance, and the electrolyte will impact the explosion-proof valve 3, failing to play a role in protecting the explosion-proof valve 3. Therefore, controlling the proportion of the opening area of the flow disturbance area 9 between 40% and 70% can not only not affect the exhaust effect of the explosion-proof valve 3, but also play a role in buffering and disturbing the electrolyte. Of course, the range of S1 / S is not limited to the above and can also be designed according to actual needs.

[0060] In this embodiment, preferably, as Figure 4As shown, along the second preset direction, the length dimension of the exhaust through-hole 12 is a3, the length dimension of the explosion-proof valve 3 is a1, and 0.5 ≤ a3 - a1 ≤ 1 mm.

[0061] According to the structure described above, while ensuring buffering and disturbing the electrolyte flow, there is sufficient exhaust length without affecting exhaust.

[0062] In this embodiment, preferably, as Figure 4 shown, along the third preset direction, the width dimension of the exhaust through-hole 12 is b3, the width dimension of the explosion-proof valve 3 is b1, and 0.5 ≤ b3 - b1 ≤ 1 mm.

[0063] According to the structure described above, while ensuring buffering and disturbing the electrolyte flow, there is sufficient exhaust width without affecting exhaust.

[0064] Embodiment Three

[0065] Refer to Figure 5 shown, an embodiment of the present application provides an electric core, including: a housing 5, a pole group 6, a side plate 7, an insulating sheet 8, and an explosion-proof valve 3; wherein, the side plate 7 is installed on the side of the pole group 6, and the insulating sheet 8 is coated on the outside of the assembly of the pole group 6 and the side plate 7 and is integrally installed in the housing 5. The aforementioned side plate 7 serves as an in-shell guiding and protecting the pole group 6; the explosion-proof valve 3 is installed on the side of the housing 5, and the explosion-proof valve 3, a partial structure of the insulating sheet 8, and the side plate 7 are sequentially arranged along a fourth preset direction;

[0066] The side plate 7 is formed with an exhaust through-hole 12, the insulating sheet 8 is formed with a plurality of flow-disturbing through-holes 10, and along the fourth preset direction, the explosion-proof valve 3, the exhaust through-hole 12, and the plurality of flow-disturbing through-holes 10 are correspondingly arranged.

[0067] The present application provides a protection structure for the explosion-proof valve of an electric core. By providing a plurality of flow-disturbing through-holes 10 on the lower plastic, while ensuring normal exhaust during thermal runaway of the electric core, it can relieve, disperse, and disturb the impact pressure from the electrolyte, thereby greatly reducing the occurrence of problems such as abnormal cracking and liquid leakage of the explosion-proof valve 3 caused by the impact of the electrolyte, and improving the safety and reliability during the use of the electric core.

[0068] In this embodiment, preferably, as Figure 5 shown, the plurality of flow-disturbing through-holes 10 are sequentially and spacedly arranged in a row along the length direction of the explosion-proof valve 3. Among them, the diameter dimension of the flow-disturbing through-hole 10 is d, the width dimension of the explosion-proof valve 3 is w, and 20% ≤ d / w ≤ 50%.

[0069] According to the structure described above, if the opening is too large, it cannot play the role of disturbing the flow, resulting in an increased risk of the electrolyte impacting the explosion-proof valve 3; if the opening is too small, it will affect the exhaust effect. Therefore, the ratio of the diameter size of the flow-disturbing through-hole 10 to the width size of the explosion-proof valve 3 is controlled between 20% and 50%, which can not only ensure the exhaust effect of the explosion-proof valve 3, but also play a role in buffering and disturbing the electrolyte flow.

[0070] Furthermore, preferably, the connection line of the centers of the multiple flow-disturbing through-holes 10 coincides with the center line of the explosion-proof valve 3 along its length direction. Of course, it is not limited to this, and there can also be a certain deviation, which is specifically designed according to actual needs.

[0071] In this embodiment, preferably, as Figure 5 shown, the side plate 7 is installed on the narrow side of the electrode group 6, and the explosion-proof valve 3 is installed on the narrow side of the housing 5.

[0072] According to the structure described above, installing the explosion-proof valve 3 on the narrow side of the housing 5, especially when multiple battery cells are assembled together, generally the large sides of the battery cells, that is, the large sides of the housing 5, are fitted together, and the narrow side of the housing 5 is exposed, that is, the explosion-proof valve 3 is exposed, thus ensuring the normal exhaust of the explosion-proof valve 3. Of course, it is not limited to this. The explosion-proof valve 3 can be installed on the large side of the housing 5, and the side plate 7 can be installed on the large side of the electrode group 6, etc., which is specifically selected according to actual needs.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit 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 for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A cover plate, a first insulating member, and an explosion-proof valve; wherein, both the explosion-proof valve and the first insulating member are installed on the cover plate, and along a first preset direction, the first insulating member is arranged closer to the electrode group side, and the explosion-proof valve is arranged farther from the electrode group side; along the first preset direction, the first insulating member forms a flow disturbance area corresponding to the explosion-proof valve, and a plurality of flow disturbance through holes are formed in the flow disturbance area.

2. The battery cell according to claim 1, wherein, Along a second preset direction, the length dimension of the flow disturbance area is a2, the length dimension of the explosion-proof valve is a1, and 0.5 ≤ a2 - a1 ≤ 2 mm.

3. The battery cell according to claim 1, wherein, Along a third preset direction, the width dimension of the flow disturbance area is b2, the width dimension of the explosion-proof valve is b1, and 0.5 ≤ b2 - b1 ≤ 2 mm.

4. The battery cell according to claim 1, characterized in that, The total opening area of all the flow disturbance through holes is S1, the total area of the flow disturbance area is S, and 40% ≤ S1 / S ≤ 70%.

5. A battery cell, characterized in that, Comprising: A cover plate, a first insulating member, an end plate, and an explosion-proof valve; wherein, both the explosion-proof valve and the first insulating member are installed on the cover plate, and along a first preset direction, the first insulating member is arranged closer to the electrode group side, the explosion-proof valve is arranged farther from the electrode group side, and the end plate is installed between the first insulating member and the electrode group; Along the first preset direction, the first insulating member forms an exhaust through hole corresponding to the explosion-proof valve, the end plate forms a flow disturbance area corresponding to the explosion-proof valve, and a plurality of flow disturbance through holes are formed in the flow disturbance area.

6. The battery cell according to claim 5, characterized in that, The end plate forms an exhaust groove, and the exhaust groove is the flow disturbance area, and flow disturbance rib plates are arranged in the exhaust groove.

7. The battery cell according to claim 5, wherein, Along a second preset direction, the length dimension of the flow disturbance area is a2, the length dimension of the explosion-proof valve is a1, and 0.5 ≤ a3 - a1 ≤ 2 mm; and / or Along a third preset direction, the width dimension of the flow disturbance area is b2, the width dimension of the explosion-proof valve is b1, and 0.5 ≤ b3 - b1 ≤ 2 mm.

8. The battery cell according to claim 5, wherein, Along a second preset direction, the length dimension of the exhaust through hole is a3, the length dimension of the explosion-proof valve is a1, and 0.5 ≤ a3 - a1 ≤ 1 mm; and / or Along a third preset direction, the width dimension of the exhaust through hole is b3, the width dimension of the explosion-proof valve is b1, and 0.5 ≤ b3 - b1 ≤ 1 mm.

9. A battery cell, characterized in that, Comprising: A housing, an electrode group, a side plate, an insulating sheet, and an explosion-proof valve; wherein, the side plate is installed on the side of the electrode group, and the insulating sheet is coated on the outside of the assembly of the electrode group and the side plate and is integrally installed in the housing; the explosion-proof valve is installed on the side of the housing, and the explosion-proof valve, a partial structure of the insulating sheet, and the side plate are arranged in sequence along a fourth preset direction; The side plate forms an exhaust through hole, the insulating sheet forms a plurality of flow disturbance through holes, and along the fourth preset direction, the explosion-proof valve, the exhaust through hole, and the plurality of flow disturbance through holes are correspondingly arranged.

10. The battery cell according to claim 9, wherein The plurality of flow disturbance through holes are arranged in a row at intervals along the length direction of the explosion-proof valve. Among them, the diameter dimension of the flow disturbance through hole is d, the width dimension of the explosion-proof valve is w, and 20% ≤ d / w ≤ 50%; and / or The side plate is installed on the narrow side of the electrode group, and the explosion-proof valve is installed on the narrow side of the housing.

Images