Battery cell, battery monomer, battery pack and electric equipment

Abstract

The utility model discloses a battery cell, a battery monomer, a battery pack and electric equipment, and relates to the technical field of batteries. The battery cell comprises a pole core and an insulating film, the insulating film wraps the peripheral surface of the pole core, at least part of the insulating film extends in the direction away from the pole core to form a convex structure, an exhaust channel is formed in at least one side of the convex structure, and the exhaust channel is suitable for being communicated with the anti-explosion valve. Compared with the prior art, the structure of the exhaust channel is simpler to form, and the weight of the whole battery cell is smaller; and meanwhile, the exhaust channel can ensure that the gas in the pole core flows to the explosion-proof valve along the exhaust channel, so that the flowing efficiency of the gas flow is improved, and the safety of the battery cell is further improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery cell, a battery unit, a battery pack, and an electrical device. Background Technology

[0002] With the development of battery technology, in order to ensure the safety and stability of the battery when abnormalities occur inside the battery (such as short circuits, overcharging, over-discharging, etc.) that cause the internal pressure of the battery to increase, an explosion-proof valve is generally installed on the battery casing. The explosion-proof valve opens under a certain pressure to release the internal gas of the battery and reduce the pressure, thereby reducing the risk of fire or explosion.

[0003] In related technologies, in order to ensure that the exhaust channel connected to the explosion-proof valve inside the battery is not blocked when thermal runaway occurs, an additional venting plate is usually installed inside the battery, and an exhaust channel is opened on the venting plate to reduce the possibility of the explosion-proof valve being blocked. However, due to the limited internal space of the battery, the exhaust effect of the exhaust channel is not good. Utility Model Content

[0004] This application aims to provide a battery cell, battery unit, battery pack, and electrical equipment that can solve the problem in related technologies where additional air guide plates are set inside the battery and exhaust channels are opened in the air guide plates to reduce the possibility of the explosion-proof valve being blocked, but the exhaust effect of the exhaust channels is poor due to the limited internal space of the battery.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a battery cell comprising: an electrode core; and an insulating film covering the outer peripheral surface of the electrode core. The insulating film extends at least partially toward a direction away from the electrode core to form a raised structure, thereby forming an exhaust channel on at least one side of the raised structure. The exhaust channel is adaptable to communicate with an explosion-proof valve.

[0007] Optionally, the insulating film includes a body and an extension. The body covers the outer peripheral surface of the electrode core, one end of the extension is connected to the body, and the other end of the extension is folded away from the electrode core to form the protruding structure.

[0008] Optionally, the electrode core has a first side surface, the first side surface having two sides disposed opposite to each other along a first direction, and the extension is disposed on the first side surface; the protrusion structure includes a first protrusion, the first protrusion being formed by bending the extension in a direction away from the electrode core, the first direction being parallel to the first side surface.

[0009] Optionally, a gap is formed between the first protrusion and at least one of the side edges, and the gap forms the exhaust passage.

[0010] Optionally, a first gap is formed between the bending portion of the extension and the adjacent side edge in the first direction, and the first gap forms the exhaust passage.

[0011] Optionally, the first protrusion is arranged adjacent to one of the side edges, and a second gap is formed between the first protrusion and the other side edge, and the second gap forms the exhaust passage.

[0012] Optionally, the protrusion structure further comprises a second protrusion, the extension is bent to form the second protrusion on the side of the first protrusion away from the pole core, the length of the second protrusion in the first direction is less than the length of the first protrusion, and a third gap is formed between at least one side of the second protrusion and the corresponding side edge, and the third gap forms the exhaust passage.

[0013] Optionally, a first gap is formed between the bending portion of the extension and the adjacent side edge in the first direction, or the first protrusion is arranged adjacent to one of the side edges, and a second gap is formed between the first protrusion and the other side edge, and the third gap forms the exhaust passage with the first gap or the second gap.

[0014] Optionally, the pole core has a first side surface, the first side surface has a first direction parallel to the first side surface, the maximum length of the protrusion structure in the first direction is m, and the length of the first side surface in the first direction is L, and L-m≥1 / 3L is satisfied.

[0015] Optionally, a first through hole is arranged in the insulating film, and the first through hole communicates the exhaust passage and the pole core.

[0016] Optionally, in the first direction, the size of the first through hole is R, and the minimum distance between the center of the first through hole and the bending portion of the extension is d, and 0≤d≤R is satisfied.

[0017] Optionally, a plurality of first through holes are arranged, and the plurality of first through holes are arranged in a second direction intersecting the first direction and the normal direction of the first side surface.

[0018] Optionally, a second through hole is further arranged in the insulating film, and the projection area of the second through hole in the normal direction of the first side surface is greater than the projection area of the first through hole, and the second through hole is arranged corresponding to the explosion-proof valve.

[0019] Optionally, the extension portion has a first end connected with the body and a second end, and a fourth gap is formed between the second end and the adjacent side edge, and the fourth gap forms the exhaust passage.

[0020] Optionally, the electrode core includes oppositely arranged first and second side surfaces, the first and second side surfaces are connected, the area of the first side surface is smaller than the area of the second side surface, and the protruding structure is arranged on the first side surface.

[0021] Optionally, the exhaust passage is arranged through one side of the protruding structure.

[0022] Optionally, the extension portion is fixedly connected with the body at a portion forming the protruding structure.

[0023] Optionally, the electrode core includes a tab, the outer circumferential surface includes two first side surfaces, two second side surfaces and two third side surfaces, the first, second and third side surfaces are connected with each other, the tab is located on the third side surface, and the insulating film is wrapped on the two first side surfaces and the two second side surfaces of the electrode core.

[0024] In a second aspect, an embodiment of the present application provides a battery monomer, including the battery cell as any of the above.

[0025] Optionally, the battery monomer further includes an explosion-proof valve and a shell, the shell has a receiving cavity, the electrode core is arranged in the receiving cavity, and the explosion-proof valve is arranged in the shell and can communicate with the exhaust passage.

[0026] In a third aspect, an embodiment of the present application provides a battery pack, including the battery cell as any of the above or the battery monomer as any of the above.

[0027] In a fourth aspect, an embodiment of the present application provides a power consumption device, including the battery cell as any of the above, the battery monomer as any of the above or the battery pack as any of the above.

[0028] In the embodiment of the present application, the battery cell includes an electrode core and an insulating film, the insulating film is wrapped on the outer circumferential surface of the electrode core, the insulating film at least partially extends in a direction away from the electrode core to form a protruding structure, the exhaust passage is formed on at least one side of the protruding structure, and the exhaust passage can be adapted to communicate with the explosion-proof valve. Thus, the protruding structure of the insulating film is ingeniously used to form the exhaust passage, the structure of the exhaust passage is simpler compared with related technologies, and the weight of the entire battery cell is smaller. Meanwhile, the exhaust passage can ensure that the gas in the electrode core flows to the explosion-proof valve along the exhaust passage, improve the flow efficiency of the gas flow, and further improve the safety of the battery cell.

[0029] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and the attendant drawings or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0030] The foregoing and / or additional aspects and advantages of the application are achieved by providing what is described below and / or claimed by the appended claims, which should be determined by reference to the appended claims and the entire specification.

[0031] Figure 1 is a schematic view of a battery cell according to embodiments of the application;

[0032] Figure 2 is a schematic view of a battery cell according to embodiments of the application;

[0033] Figure 3 is a schematic view of an insulated film coated electrode core according to embodiments of the application;

[0034] Figure 4 is a schematic view of a first battery cell according to embodiments of the application;

[0035] Figure 5 is a schematic view of a second battery cell according to embodiments of the application;

[0036] Figure 6 is a schematic view of a third battery cell according to embodiments of the application;

[0037] Figure 7 is a schematic view of a fourth battery cell according to embodiments of the application;

[0038] Figure 8 is a partial schematic view of a battery cell according to embodiments of the application.

[0039] REFERENCE NUMERALS:

[0040] 1: electrode core; 11: first side surface; 111: first side edge; 112: second side edge; 12: second side surface; 13: third side surface; 14: tab; 2: insulating film; 20: protruding structure; 201: first protrusion; 202: second protrusion; 21: body; 22: extension; 221: first end; 222: second end; 23: first through hole; 24: second through hole; 3: exhaust passage; 31: first gap; 32: second gap; 33: third gap; 34: fourth gap; 4: explosion-proof valve; 5: housing; 51: accommodating cavity; m: length of first protrusion; L: length of first side surface along first direction; R: dimension of first through hole along first direction; d: minimum distance between center of first through hole and bending of extension; X: first direction; Y: second direction; Z: normal direction of first side surface. DETAILED DESCRIPTION

[0041] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0044] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The battery cell, battery pack and electric equipment provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments and their application scenarios.

[0046] As Figures 2-7As shown, in some embodiments of the present application, an electric core is proposed, which comprises a pole core 1 and an insulating film 2, the insulating film 2 is wrapped on the outer circumferential surface of the pole core 1, the insulating film 2 at least partially extends in the direction away from the pole core 1 to form a protruding structure 20, so as to form an exhaust passage 3 on at least one side of the protruding structure 20, and the exhaust passage 3 is adapted to communicate with the explosion-proof valve 4.

[0047] In the embodiments of the present application, the protruding structure 20 formed by the extension of the insulating film 2 in the direction away from the pole core 1 forms the exhaust passage 3 on at least one side of the protruding structure 20, and the exhaust passage 3 can guide the gas formed in the pole core 1 to the explosion-proof valve 4 and then flow out. Compared with the related art, the structure of the exhaust passage 3 is simpler, and the weight of the entire electric core is smaller. At the same time, when the explosion-proof valve 4 is opened, the exhaust passage 3 can ensure that the gas in the pole core 1 flows along the exhaust passage 3 to the explosion-proof valve 4, thereby improving the flow efficiency of the gas flow and improving the safety of the electric core.

[0048] In specific applications, the insulating film 2 at least partially extends in the direction away from the pole core 1 to form the protruding structure 20, which can be at least partially folded to form the protruding structure 20, or can be curled to form the protruding structure 20, or can form a redundancy, and the redundant part forms the protruding structure 20. Of course, it can also be any form of forming the protruding structure 20, and those skilled in the art can set it according to actual needs, and the present application does not limit it.

[0049] It needs to be explained that the pole core 1 is a component where electrochemical reaction occurs in the electric core, and one or more pole cores 1 can be provided in an electric core. The pole core 1 is mainly formed by winding or layering the positive electrode sheet and the negative electrode sheet, and an insulating film is usually provided between the positive electrode sheet and the negative electrode sheet, which is used to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit of the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a part of active material constituting the main part of the pole core 1.

[0050] In actual processing, the width of the positive electrode sheet and the negative electrode sheet is not consistent, so that the positive electrode sheet and the negative electrode sheet form a gap at the edge position. When the gas is formed by thermal runaway in the pole core 1, the gas can flow out to the insulating film 2 through the gap between the positive electrode sheet and the negative electrode sheet, and then flow into the exhaust passage 3 formed by the protruding structure 20 on the insulating film 2, and finally flow out from the explosion-proof valve 4.

[0051] In specific applications, the side of the protruding structure 20 away from the pole core 1 is in contact with the electric core shell, so that the exhaust passage 3 is formed between the side of the protruding structure 20 and the electric core shell, so that no additional elements are needed to open the exhaust passage.

[0052] It can be understood that the material of the insulating film includes at least one of PP, PC, PET, PVC insulating sheet, etc., and the skilled in the art can set it according to the actual needs, and the application does not limit it.

[0053] It needs to be explained that the battery cell can be a common lithium ion battery cell, a polymer lithium battery cell, a lithium iron phosphate battery cell, and a battery cell including positive and negative electrode sheets, and the skilled in the art can select it according to the actual needs, and the application does not limit it.

[0054] As shown in Figures 2-7 In some embodiments of the application, the insulating film 2 includes a body 21 and an extension 22, the body 21 is wrapped around the outer circumferential surface of the battery core 1, one end of the extension 22 is connected to the body 21, and the other end of the extension 22 is folded towards the direction away from the battery core 1 to form a protruding structure 20.

[0055] In the embodiments of the application, the body 21 of the insulating film 2 is wrapped around the outer circumferential surface of the battery core 1, one end of the extension 22 is connected to the body 21, and the other end of the extension 22 is folded towards the direction away from the battery core 1 to form a protruding structure 20, so that in the actual processing process, the end of the battery core 1 wrapped by the insulating film 2 is folded to form a protruding structure 20, thereby forming an exhaust passage 3 on at least one side of the protruding structure 20, without the need for additional processes, reducing the manufacturing cost of the battery cell and improving the processing efficiency of the battery cell.

[0056] It needs to be explained that the body 21 refers to the part of the insulating film 2 directly wrapped around the battery core 1, and the extension 22 refers to the part of the insulating film 2 wrapped around the outer circumferential surface of the battery core 1 without directly contacting the battery core 1. In the actual processing process, the insulating film 2 is wrapped around the outer circumferential surface of the battery core 1 layer by layer in clockwise or counterclockwise direction, the innermost layer of the insulating film 2 directly contacting the battery core 1 is the body 21, and the end part and a part of the extension segment of the insulating film 2 wrapped at last are the extension 22.

[0057] In specific applications, the other end of the extension 22 is the end of the insulating film 2 finally wrapped around the battery core 1 in the wrapping process. In actual application, the insulating film 2 is a whole film, and the end of the whole film is wrapped around the battery core 1 first, and the other end is finally wrapped around the battery core 1 after being wrapped around the battery core 1 for several times. The other end here is the other end of the extension 22.

[0058] It can be understood that the other end of the extension 22 is folded towards the direction away from the battery core 1 to form a protruding structure 20, which can be bent once or multiple times to form a protruding structure 20. The skilled in the art can set it according to the actual needs, and the application does not limit it.

[0059] It needs to be explained that the protruding structure 20 specifically refers to the protruding part of the insulating film 2 away from the core 1; of course, in the specific folding process, it can be bent and folded in any direction, for example: in the width direction, thickness direction of the core 1, S-shaped bending and folding, curling and folding, etc. One of any form, those skilled in the art can set according to actual needs, and the present application does not limit this.

[0060] In addition, as Figure 2 shown, in an embodiment of the present application, the core 1 includes the tab 14, the outer peripheral surface includes two opposite first side surfaces 11, two second side surfaces 12 and two third side surfaces 13, the first side surface 11, the second side surface 12 and the third side surface 13 are connected with each other, wherein the tab 14 is located on the third side surface 13, and the insulating film 2 is wrapped on the two first side surfaces 11 and the two second side surfaces 12 of the core 1. Figure 2 As shown, the tab 14 is the electrode terminal of the battery, which can be a positive electrode terminal or a negative electrode terminal.

[0061] In the embodiment of the present application, by wrapping the insulating film 2 on the two first side surfaces 11 and the two second side surfaces 12 of the core 1, the remaining outer peripheral surface of the core 1 without the tab 14 is wrapped by the insulating film 2, so that the wrapping operation is simpler, and the insulation requirement of the core 1 is met.

[0062] Specifically, as Figure 2 and Figure 8 shown, it is a wrapping method of the insulating film 2 in an embodiment of the present application, the insulating film 2 wraps the core 1 along the first direction X (thickness direction) of the core 1, wherein the extension 22 is bent one or more times along the width direction, and the bent part forms the protruding structure 20. The core 1 is provided with two third side surfaces 13 along the second direction Y, two second side surfaces 12 along the first direction X, and two first side surfaces 11 along the third direction Z. Among them, the third side surface 13 is provided with the tab 14. The insulating film 2 wraps the outer peripheral surface of the core 1, that is, the insulating film 2 at least wraps the two first side surfaces 11 and the two second side surfaces 12 of the core 1. The insulating film 2 can not wrap the third side surface 13 of the core 1 where the tab 14 is arranged, thereby preventing the influence of the insulating film 2 on the tab 14 and improving the safety. Generally, the third side surface 13 can also be wrapped by setting a structure such as adhesive paper to achieve the insulation effect.

[0063] It needs to be explained that in actual application, the first side 11 is a narrow side of the pole core 1, the second side 12 is a large side (wide side) of the pole core 1, and the third side 13 is a top side or a bottom side of the pole core 1. The tab 14 is arranged on the third side 13 (top side) of the pole core 1, and the tab 14 includes a positive electrode tab and a negative electrode tab, which are used to be electrically connected with external elements to output electric energy in the pole core 1 or input external electric energy into the pole core 1 to charge the pole core 1.

[0064] As shown in Figures 3-6 , in some embodiments of the present application, the pole core 1 has a first side 11, the first side 11 has two opposite sides along a first direction X, and the extension 22 is arranged on the first side 11; the protruding structure 20 includes a first protrusion 201, the first protrusion 201 is formed by bending the extension 22 towards a direction away from the pole core 1, and the first direction X is parallel to the first side 11.

[0065] In the embodiments of the present application, the protruding structure 20 includes the first protrusion 201, the first protrusion 201 is formed by bending the extension 22 towards a direction away from the pole core 1, so that the protruding structure 20 is formed on one side of the pole core 1, and then one side of the protruding structure 20 on the surface forms the exhaust passage 3, so that the internal space of the battery cell can be effectively utilized to form the exhaust passage 3 to guide the gas to the explosion-proof valve 4.

[0066] Specifically, as shown in Figures 3-7 , the first side has two opposite sides along a first direction X, and the two sides are a first side 111 and a second side 112 respectively.

[0067] In specific application, the first direction X is specifically a thickness direction of the pole core 1, and the first side 11 is a narrow side of the pole core 1; or the first direction X can be a width direction of the pole core 1, and the first side 11 can be a large side of the pole core 1.

[0068] As shown in Figure 4 , Figure 5 , Figure 6 and Figure 7 , in some embodiments of the present application, a gap exists between the first protrusion 201 and at least one of the two sides, and the gap forms the exhaust passage 3.

[0069] In the embodiments of the present application, a gap exists between the first protrusion 201 and at least one of the two sides, and the gap forms the exhaust passage 3, so that the gas generated when the pole core 1 occurs thermal runaway can flow along the exhaust passage 3 to the explosion-proof valve 4, and the gas flow is more smooth.

[0070] In specific application, as shown in Figure 4 , the first protrusion 201 and the first side 111 can have a first gap 31, or as shown inFigure 5 and Figure 6 As shown, a second gap 32 exists between the first protrusion 201 and the second side 112. Those skilled in the art can make corresponding settings according to actual needs, and this application does not impose any restrictions on this.

[0071] It should be explained that the first protrusion 201 is formed by bending the extension 22 of the insulating film 2 once, or by bending it multiple times to form multiple bends of the same length along the first direction X.

[0072] like Figure 3 and Figure 4 As shown, in some embodiments of this application, along the first direction X, there is a first gap 31 between the bend of the extension 22 and the adjacent side, and the first gap 31 forms an exhaust channel 3.

[0073] In this embodiment, a first gap 31 exists between the bend of the extension 22 and the adjacent side, forming an exhaust channel 3. This allows the gas generated by the electrode core 1 during thermal runaway to flow through the exhaust channel 3 to the explosion-proof valve 4, resulting in smoother gas flow. The exhaust channel 3 formed between the bend of the extension 22 and the adjacent side fully utilizes the internal space of the battery cell. Furthermore, during actual use, the side of the bend away from the electrode core 1 will contact the battery cell casing, ensuring that the exhaust channel 3 will not deform during battery cell use and reducing the possibility of airflow obstruction.

[0074] Understandably, such as Figure 4 As shown, the bend of the extension 22 specifically refers to the part where the extension 22 bends once or multiple times. There is a first gap 31 between this area and the first side 111. In actual processing, it means that there is a first gap 31 between the bend of the extension 22 and its nearest side.

[0075] In practical applications, the cross-sectional size of the exhaust channel 3 is affected by the number of bends in the extension 22 and the thickness of the insulating film 2, such as Figure 4 As shown, assuming the length of the first gap 31 along the first direction X is f and the thickness of the insulating film 2 is t, then the cross-sectional area of ​​the exhaust channel 3 is S = 2ft.

[0076] like Figure 5 and Figure 6 As shown, in some embodiments of this application, the first protrusion 201 is disposed near one of the sides, and a second gap 32 exists between the first protrusion 201 and the other side, the second gap 32 forming an exhaust channel 3.

[0077] In an embodiment of the present application, the first protrusion 201 is disposed close to one of the side edges, and there is a second gap 32 between the first protrusion 201 and the other side edge. The second gap 32 forms an exhaust passage 3, so as to make full use of the internal space of the battery cell to form the exhaust passage 3. Moreover, since the first protrusion 201 is disposed close to one of the side edges, the space of the exhaust passage 3 is larger and the air flow efficiency is higher, further improving the safety of the battery cell.

[0078] In a specific application, the first protrusion 201 is disposed close to the first side edge 111, specifically, it means that the bent portion of the extension part 22 is closely attached to the first side edge 111. In actual use, one side of the first protrusion 201 contacts the battery cell housing at the first side edge 111, and since the first protrusion 201 protrudes from the rest of the extension part 22, a second gap 32 is formed on the other side.

[0079] It can be understood that the first protrusion 201 is specifically formed by folding multiple insulating films 2, specifically, as shown in Figure 5 and Figure 6 The first protrusions 201 are formed in multiple layers stacked along the third direction Z; of course, the first protrusions 201 can also be formed in multiple layers stacked along the first direction X; the specific folding shape can be any folding method such as S-shaped folding, "square frame" folding, curling, etc. Those skilled in the art can set according to actual needs, and the present application does not limit this.

[0080] In a specific application, the cross-sectional size of the exhaust passage 3 is affected by the number of bends of the extension part 22 and the thickness of the insulating film 2. As shown in Figure 5 assuming that the length of the first protrusion 201 along the first direction X is m, the thickness of the insulating film 2 is t, the number of layers of the insulating film 2 included in the protrusion structure 20 is n, and the length of the first side 11 along the first direction X is L, then the cross-sectional area S of the exhaust passage 3 = (L - m)nt.

[0081] As shown in Figure 7 In some embodiments of the present application, the protrusion structure 20 further includes a second protrusion 202. The extension part 22 is bent on the side of the first protrusion 201 away from the electrode core 1 to form the second protrusion 202. Along the first direction X, the length of the second protrusion 202 is less than the length of the first protrusion 201. There is a third gap 33 between at least one side of the second protrusion 202 and the corresponding side edge, and the third gap 33 forms the exhaust passage 3.

[0082] In the embodiments of the present application, the extension 22 is bent to form a second protrusion 202 on the side of the first protrusion 201 away from the pole core 1, the length of the second protrusion 202 in the first direction X is less than the length of the first protrusion 201, and a third gap 33 is formed between at least one side of the second protrusion 202 and the corresponding side edge, the third gap 33 forms the exhaust passage 3, so that the exhaust passage 3 is formed by using more forms of protrusion structures 20, the forming mode of the exhaust passage 3 is enriched, in the actual processing process, the actual situation can be selected, thereby reducing the processing cost of the battery cell, and the internal space of the battery cell can be fully utilized, and the exhaust efficiency is ensured.

[0083] In specific applications, the first protrusion 201 can be the first protrusion 201 described in any of the preceding embodiments, specifically, the first protrusion 201 can be in contact with or spaced apart from the first side edge 111 or the second side edge 112, and the first protrusion 201 can be bent once or multiple times to form; the second protrusion 202 is bent again on the basis of the first protrusion 201, that is, as shown in Figure 7 , the extension 22 is bent once to form the first protrusion 201, and then bent again in the direction away from the pole core 1 to form the second protrusion 202; wherein the number of times of bending of the extension 22 can be one or more, and the number of the second protrusions 202 can be one or more, and a person skilled in the art can set it according to actual needs, and the present application does not limit it.

[0084] It should be explained that the bending mode of the first protrusion 201 and the second protrusion 202 includes but is not limited to at least one of S-shaped bending, "hui" bending, convolution formation, etc., and a person skilled in the art can set it according to actual needs, and the present application does not limit it.

[0085] In specific applications, the length of the second protrusion 202 refers to the sum of the lengths of the plurality of second protrusions 202 in the first direction X, thereby forming a shape of "smaller at the top and larger at the bottom", so that the formed exhaust passage 3 can be in communication with the explosion-proof valve 4.

[0086] It can be understood that, as shown in Figure 5 or Figure 6 , although the extension 22 is bent more than twice, the protrusion structure 20 formed thereby and the first side edge 111 or the second side edge 112 only form a gap extending in the first direction X, so when the protrusion structure 20 and the first side edge 111 or the second side edge 112 only form a gap extending in the first direction X, the protrusion structure 20 is the first protrusion 201. As Figure 7When the protruding structure 20 forms at least two gaps extending along the first direction X with the first side edge 111 or the second side edge 112, the protruding structure 20 near the part of the core 1 along the third direction Z is a first protrusion 201, and the protruding structure 20 on the first protrusion 201 along the third direction Z is a second protrusion 202.

[0087] As shown in the drawings, in some embodiments of the present application, there is a first gap 31 between the bending part of the extension 22 along the first direction X and the adjacent side edge, or a first protrusion 201 is arranged near one of the side edges, a second gap 32 is arranged between the first protrusion 201 and the other side edge, and a third gap 33 forms the exhaust passage 3 with the first gap 31 or the second gap 32. Figure 7

[0088] In the embodiments of the present application, the third gap 33 forms the exhaust passage 3 with the first gap 31 or the second gap 32, so that the exhaust passage 3 is formed by more forms of protruding structures 20, the forming mode of the exhaust passage 3 is enriched, in actual processing, it can be selected according to actual conditions, thereby reducing the processing cost of the battery cell, and the internal space of the battery cell can be fully utilized, and the exhaust efficiency is ensured.

[0089] It should be explained that the first gap 31 and the third gap 33 can be communicated to form the exhaust passage 3, or the second gap 32 and the third gap 33 can be communicated to form the exhaust passage 3. Exemplarily, as shown in the drawings, the first protrusion 201 and the first side edge 111 form the first gap 31, the second protrusion 202 and the first side edge 111 form the third gap 33, and the first gap 31 and the third gap 33 are communicated to form the exhaust passage 3. Figure 7

[0090] As shown in the drawings, in some embodiments of the present application, the core 1 has a first side surface 11, and the first side surface 11 has a first direction X parallel to the first side surface 11 along the first direction X; the maximum length of the protruding structure 20 along the first direction X is m, the length of the first side surface 11 along the first direction X is L, and L-m≥1 / 3L is satisfied. Figure 5 In the embodiments of the present application, the correlation between the maximum length m of the protruding structure 20 along the first direction X and the length L of the first side surface 11 along the first direction X is set within a reasonable range, so that the gas flow space of the formed exhaust passage 3 is not too small, and the exhaust efficiency is ensured.

[0091]

[0092] ​​​In a specific application, the above relationship can also be simplified as m≤2 / 3L, that is, the maximum length m of the protruding structure 20 along the first direction X is within 2 / 3 of the thickness of the pole core 1, so that the cross-sectional area of the exhaust passage 3 formed by the area outside the protruding structure 20 is not too small, thereby ensuring the exhaust efficiency.

[0093] It should be explained that the maximum length m of the protruding structure 20 along the first direction X can be the maximum length of the first protrusion 201 or the maximum length of the second protrusion 202, which is determined according to the maximum length of the first protrusion 201 and the second protrusion 202 along the first direction X.

[0094] It can be understood that when the length of the protruding structure 20 in the first direction X is too large, the length of the exhaust passage 3 in the first direction X will be too small, and the total amount of gas passing through the exhaust passage 3 will be too small, so that the exhaust efficiency cannot be guaranteed.

[0095] As shown in the drawings, Figure 8 In some embodiments of the present application, a first through hole 23 is provided in the insulating film 2, and the first through hole 23 communicates the exhaust passage 3 with the pole core 1.

[0096] In the embodiments of the present application, by providing the first through hole 23 on one side of the protruding structure 20 along the first direction X, the first through hole 23 communicates the exhaust passage 3 with the pole core 1, so that the gas generated when the thermal runaway occurs in the pole core 1 can flow out to the exhaust passage 3 through the first through hole 23, and then flow out from the explosion-proof valve 4, thereby ensuring the exhaust efficiency.

[0097] In a specific application, the first through hole 23 can be provided as a circular hole, an elliptical hole, a long strip hole or any through hole, which can be set according to actual needs by those skilled in the art, and the present application does not limit this.

[0098] It should be explained that the first through hole 23 penetrates all the insulating films 2 along the normal direction Z of the first side surface 11, thereby communicating the pole core 1 with the exhaust passage 3; the first through hole 23 is provided on one side of the protruding structure 20 along the first direction X, which can reduce the shielding of the first through hole 23 caused by the bending of the insulating film 2 in actual work, thereby affecting the exhaust efficiency.

[0099] As shown in the drawings, Figure 8 In some embodiments of the present application, along the first direction X, the size of the first through hole 23 is R, and the minimum distance d between the center of the first through hole 23 and the bending part of the extension 22 satisfies: 0≤d≤R.

[0100] In the embodiments of the present application, by setting the minimum distance d between the center of the first through hole 23 and the bending part of the extension 22 within a reasonable range, the efficiency of the gas in the pole core 1 flowing out from the first through hole 23 to the exhaust passage 3 is ensured.

[0101] In a specific application, the minimum distance d between the center of the first through hole 23 and the bending part of the extension 22 can be set to 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, R or any range between any two values.

[0102] It can be understood that when the minimum distance d between the center of the first through hole 23 and the bending part of the extension 22 is greater than R, the first through hole 23 is too far away from the bending part of the extension 22, that is, the first through hole 23 is too far away from the protruding structure 20. Since the insulating film 2 is made of flexible material, it will deform during actual operation. When the first through hole 23 is too far away from the protruding structure 20, the insulating film 2 will block or block the first through hole 23, causing poor gas flow and low exhaust efficiency.

[0103] It should be explained that the size of the first through hole 23 along the first direction X is R. When the first through hole 23 is a circular hole, R is the radius of the circular hole. When the first through hole 23 is a square hole, R is half the length of a side of the square. The rest is similar.

[0104] As shown in Figure 8 In some embodiments of the present application, a plurality of first through holes 23 are provided, and the plurality of first through holes 23 are arranged at intervals along the second direction Y, and the second direction Y intersects the normal direction Z of the first side surface 11 and the first direction X.

[0105] In the embodiments of the present application, by arranging a plurality of first through holes 23 along the second direction Y, the gas flow can flow out of the pole core 1 through the plurality of first through holes 23 to the exhaust passage 3, thereby improving the flow rate of the gas flow, improving the exhaust efficiency, and ensuring the safety of the pole core.

[0106] In a specific application, the first direction X is the thickness direction of the pole core 1, the second direction Y is the length direction of the pole core 1, and the normal direction Z of the first side surface 11 is also the width direction of the pole core 1.

[0107] As shown in Figure 8 In some embodiments of the present application, a second through hole 24 is also provided in the insulating film 2. The projected area of the second through hole 24 along the normal direction Z of the first side surface 11 is greater than the projected area of the first through hole 23, and the second through hole 24 is adapted to be arranged corresponding to the explosion-proof valve 4.

[0108] In the embodiments of the present application, by providing the second through hole 24 in the insulating film 2, the second through hole 24 is adapted to communicate with the explosion-proof valve 4, thereby further improving the exhaust efficiency, and directly exhausting the gas flow through the second through hole 24 to the explosion-proof valve 4.

[0109] In a specific application, the second through hole 24 has a larger normal projection area than the first through hole 23 along the normal direction Z of the first side 11, that is, the second through hole 24 has a larger normal projection area than the first through hole 23 along the width direction of the pole core 1.

[0110] It should be explained that the second through hole 24 can be a circular hole, an elliptical hole, a long hole, a square hole, etc. Any shape of the through hole can be set according to actual needs, and the present application does not limit this.

[0111] As shown in the drawings, Figures 3-7 In some embodiments of the present application, the extension 22 has a first end 221 and a second end 222, the first end 221 is connected with the body 21, and the second end 222 has a fourth gap 34 with the adjacent side, and the fourth gap 34 forms the exhaust passage 3.

[0112] In the embodiments of the present application, the first end 221 is connected with the body 21, and the second end 222 has a fourth gap 34 with the adjacent side, and the fourth gap 34 forms the exhaust passage 3, thereby forming another form of the exhaust passage 3, thereby enriching the forming mode of the exhaust passage 3, and the operator can set according to actual needs, thereby reducing the processing cost of the battery cell.

[0113] In a specific application, the first end 221 is the end of the extension 22 connected with the body 21, and the second end 222 is a free end, and the second end 222 has a fourth gap 34 with the adjacent side, that is, the second side 112, and the fourth gap 34 cooperates with the first gap 31, the second gap 32, and the third gap 33 in the above-mentioned any embodiment to form the exhaust passage 3.

[0114] As shown in the drawings, Figure 2 , Figure 3 and Figure 4 In some embodiments of the present application, the pole core 1 includes oppositely arranged first side 11 and second side 12, the first side 11 and the second side 12 are connected, the area of the first side 11 is smaller than the area of the second side 12, and the convex structure 20 is arranged on the first side 11.

[0115] In the embodiments of the present application, the first side 11 of the pole core 1 has a smaller area than the second side 12, so that the extension 22 forms a protruding structure 20 on the first side 11, thereby forming the exhaust passage 3. Specifically, the first side 11 of the pole core 1 is a narrow side (a surface in the thickness direction), and the second side 12 of the pole core 1 is a wide side (a surface in the width direction), so that after the pole core 1 forms a battery cell, the wide sides of a plurality of battery cells are stacked with each other, improving the use convenience of the battery cell. In addition, the exhaust passage 3 is arranged on the first side 11 (the narrow side), so that when the plurality of battery cells are stacked, the exhaust is not affected, improving the safety of the battery cell.

[0116] In specific applications, the areas of the first side 11 and the second side 12 can be calculated by measuring the side lengths of the first side 11 and the second side 12. For example, when the first side 11 and the second side 12 are rectangles, the areas are equal to the lengths multiplied by the widths.

[0117] In some embodiments of the present application, the exhaust passage 3 is arranged through one side of the protruding structure 20.

[0118] In the embodiments of the present application, the exhaust passage 3 is arranged through one side of the protruding structure 20, so that the exhaust passage 3 can cover a larger range of the pole core 1, so that the gas generated by thermal runaway in each part of the pole core 1 can enter the exhaust passage 3 and then be discharged along the explosion-proof valve 4.

[0119] In specific applications, the exhaust passage 3 is arranged through the pole core 1 along the length direction of the pole core 1, that is, the arrangement direction of the first through hole 23.

[0120] As shown in Figure 5 , Figure 6 and Figure 7 , in some embodiments of the present application, the extension 22 is fixedly connected to the body 21 at the part forming the protruding structure 20.

[0121] In the embodiments of the present application, the extension 22 is fixedly connected to the body 21 at the part forming the protruding structure 20, so as to ensure the structural stability of the protruding structure 20, avoiding deformation of the protruding structure 20 and affecting the normal use of the exhaust passage 3 on one side of the protruding structure 20.

[0122] In specific applications, the extension 22 can be fixedly connected to the body 21 at the part forming the protruding structure 20 by using laser heat melting, coating glue, or the like.

[0123] As shown in Figure 1 , in some embodiments of the present application, a battery cell is also provided, which comprises the battery cell as described in any of the above embodiments.

[0124] In the embodiments of the present application, the battery cell includes a pole core 1 and an insulating film 2, the insulating film 2 is coated on the outer circumferential surface of the pole core 1, the insulating film 2 at least partially extends in the direction away from the pole core 1 to form a protruding structure 20, and an exhaust passage 3 is formed on at least one side of the protruding structure 20, the exhaust passage 3 is adapted to communicate with the explosion-proof valve 4, so that the protruding structure 20 formed by the insulating film 2 extending in the direction away from the pole core 1 is ingeniously utilized to form the exhaust passage 3 on at least one side of the protruding structure 20, and in the case that the explosion-proof valve 4 is opened, the exhaust passage 3 can guide the gas formed in the pole core 1 to the explosion-proof valve 4 and then flow out. Compared with the related art, the structure of the exhaust passage 3 is simpler, and the weight of the entire battery cell is smaller. At the same time, the exhaust passage 3 can ensure that the gas in the pole core 1 flows along the exhaust passage 3 to the explosion-proof valve 4, thereby improving the flow efficiency of the gas flow and improving the safety of the battery cell.

[0125] As shown in Figures 1-7 In some embodiments of the present application, the battery cell further includes an explosion-proof valve 4 and a shell 5, the shell 5 has a containing cavity 51, the pole core 1 is arranged in the containing cavity 51, and the explosion-proof valve 4 is arranged in the shell 5 and can communicate with the exhaust passage 3.

[0126] In the embodiments of the present application, the pole core 1 is arranged in the containing cavity 51 of the shell 5 to protect the pole core 1 and isolate it from the outside world, and the explosion-proof valve 4 is arranged in the shell 5, so that in the case that the explosion-proof valve 4 is opened, the exhaust passage 3 communicates with the explosion-proof valve 4 to form a gas flow path, so that the gas can flow out of the pole core 1, enter the exhaust passage 3, and then flow out of the explosion-proof valve 4.

[0127] In specific applications, the explosion-proof valve 4 is welded on the shell 5, and when the explosion-proof valve 4 is welded on the inner side of the shell 5, a protective glue needs to be coated or pasted on the protruding structure 20 to avoid direct contact between the protruding structure 20 and the welding position.

[0128] In some embodiments of the present application, a battery pack is also provided, which includes the battery cell according to any of the above embodiments or the battery cell according to any of the above embodiments.

[0129] In the embodiments of the present application, the battery cell includes a pole core 1 and an insulating film 2, the insulating film 2 is wrapped on the outer circumferential surface of the pole core 1, the insulating film 2 at least partially extends in the direction away from the pole core 1 to form a protruding structure 20, and an exhaust passage 3 is formed on at least one side of the protruding structure 20, the exhaust passage 3 is adapted to communicate with the explosion-proof valve 4, so that the protruding structure 20 formed by the insulating film 2 extending in the direction away from the pole core 1 is ingeniously utilized to form the exhaust passage 3 on at least one side of the protruding structure 20, and in the case that the explosion-proof valve 4 is opened, the exhaust passage 3 can guide the gas formed in the pole core 1 to the explosion-proof valve 4 and then flow out. Compared with the related art, the structure of the exhaust passage 3 is simpler, and the weight of the entire battery cell is smaller; at the same time, the exhaust passage 3 can ensure that the gas in the pole core 1 flows along the exhaust passage 3 to the explosion-proof valve 4, thereby improving the flow efficiency of the gas flow and further improving the safety of the battery cell.

[0130] In some embodiments of the present application, an electric device is also provided, which includes the battery cell as described in any of the above embodiments, or includes the battery monomer as described in any of the above embodiments, or includes the battery pack as described in any of the above embodiments.

[0131] In specific applications, the electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not specially limit the above electric devices.

[0132] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0133] While the embodiments of the application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric cell, characterized by, The application relates to a battery electrode, comprising: a core (1); an insulating film (2) covering the outer circumferential surface of the core (1), the insulating film (2) extending at least partially towards the direction away from the core (1) to form a protruding structure (20), so as to form an exhaust passage (3) on at least one side of the protruding structure (20), the exhaust passage (3) being adapted to communicate with an explosion-proof valve (4).

2. The electric cell of claim 1, wherein, The insulating film (2) comprises a body (21) covering the outer circumferential surface of the core (1) and an extension (22), one end of the extension (22) being connected to the body (21), and the other end of the extension (22) being folded towards the direction away from the core (1) to form the protruding structure (20).

3. The electric cell of claim 2, wherein, The core (1) has a first side surface (11) with two side edges oppositely arranged along a first direction (X), and the extension (22) is arranged on the first side surface (11); the protruding structure (20) comprises a first protrusion (201) formed by folding the extension (22) towards the direction away from the core (1), and the first direction (X) is parallel to the first side surface (11).

4. The electric cell of claim 3, wherein, There is a gap between the first protrusion (201) and at least one of the two side edges, and the gap forms the exhaust passage (3).

5. The electric cell of claim 4, wherein, Along the first direction (X), there is a first gap (31) between the folding position of the extension (22) and the adjacent side edge, and the first gap (31) forms the exhaust passage (3).

6. The electric cell of claim 4, wherein, The first protrusion (201) is arranged close to one of the side edges, and there is a second gap (32) between the first protrusion (201) and the other side edge, and the second gap (32) forms the exhaust passage (3).

7. The cell of any of claims 3-6, wherein, The protruding structure (20) further comprises a second protrusion (202) formed by folding the extension (22) on the side of the first protrusion (201) away from the core (1), and along the first direction (X), the length of the second protrusion (202) is smaller than that of the first protrusion (201), and there is a third gap (33) between at least one side of the second protrusion (202) and the corresponding side edge, and the third gap (33) forms the exhaust passage (3).

8. The electric cell of claim 7, wherein, Along the first direction (X), there is a first gap (31) between the folding position of the extension (22) and the adjacent side edge, or the first protrusion (201) is arranged close to one of the side edges, and there is a second gap (32) between the first protrusion (201) and the other side edge, and the third gap (33) forms the exhaust passage (3) together with the first gap (31) or the second gap (32).

9. The electric cell of claim 1, wherein, The pole core (1) has a first side (11) having a first direction (X) parallel to the first side (11); the maximum length of the protruding structure (20) in the first direction (X) is m, and the length of the first side (11) in the first direction (X) is L, which satisfies: L-m≥1 / 3L.

10. The electric cell of claim 3, wherein, The insulation film (2) is provided with a first through hole (23) communicating the exhaust passage (3) and the pole core (1).

11. The electric cell of claim 10, wherein, In the first direction (X), the size of the first through hole (23) is R, and the minimum distance between the center of the first through hole (23) and the bending part of the extension (22) is d, which satisfies: 0≤d≤R.

12. The electric cell of claim 11, wherein, The first through hole (23) is provided with a plurality of first through holes (23) arranged along the second direction (Y), and the second direction (Y) intersects the first direction (X) and the normal direction (Z) of the first side (11).

13. The electric cell of claim 12, wherein, The insulation film (2) is also provided with a second through hole (24), and the projection area of the second through hole (24) in the normal direction (Z) of the first side (11) is greater than the projection area of the first through hole (23), and the second through hole (24) is adapted to be arranged correspondingly with the explosion-proof valve (4).

14. The cell of any of claims 3-8, wherein, The extension (22) has a first end (221) connected with the body (21) and a second end (222) having a fourth gap (34) with the adjacent side, and the fourth gap (34) forms the exhaust passage (3).

15. The electrically charged cell of claim 1, wherein, The pole core (1) comprises a first side (11) and a second side (12) arranged oppositely, the first side (11) and the second side (12) are connected, the area of the first side (11) is smaller than the area of the second side (12), and the protruding structure (20) is arranged on the first side (11).

16. The electrically charged cell of claim 1, wherein, The exhaust passage (3) is arranged through one side of the protruding structure (20).

17. The electrically charged cell of claim 2, wherein, The extension (22) is fixedly connected with the body (21) at the part forming the protruding structure (20).

18. The electrically core of claim 1, wherein, The pole core (1) comprises a tab (14), and the outer peripheral surface comprises two first sides (11), two second sides (12) and two third sides (13) arranged oppositely and connected with each other, wherein the tab (14) is located on the third side (13), and the insulation film (2) covers the two first sides (11) and the two second sides (12) of the pole core (1).

19. A battery cell, characterized by The battery cell comprises the pole core (1) according to any one of claims 1-18.

20. The battery cell of claim 19, wherein, The battery cell further comprises an explosion-proof valve (4) and a shell (5), the shell (5) has a receiving cavity (51), the pole core (1) is arranged in the receiving cavity (51), the explosion-proof valve (4) is arranged in the shell (5), and the explosion-proof valve (4) can communicate with the exhaust passage (3).

21. A battery pack, characterized by, A battery cell comprising the cell as defined in any of claims 1-18, or the battery cell as defined in any of claims 19-20.

22. An electrical device, comprising: A battery cell comprising the cell as defined in any of claims 1-18, or the battery cell as defined in any of claims 19-20; or the battery pack as defined in claim 21.

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