Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. The battery monomer comprises: a housing, which comprises a shell and an end cover, the end cover covers an opening of the shell, and the end cover is provided with a liquid injection hole; an electrode assembly accommodated in the case; the insulating part is contained in the shell and arranged between the end cover and the electrode assembly, the insulating part is provided with a first surface facing the end cover, a diversion trench is formed in the first surface, and the diversion trench at least extends to the side edge, arranged in the length direction and / or the width direction of the insulating part, of the insulating part; the orthographic projection of the diversion trench and the orthographic projection of the liquid injection hole in the thickness direction of the insulating part are at least partially overlapped. According to the battery monomer, the battery and the power utilization device provided by the invention, the risk of dislocation and even tearing of the pole pieces can be reduced, and the safety is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery and an electric device. BACKGROUND

[0002] In recent years, the new energy industry has been getting more and more attention. As an important part of the new energy industry, batteries account for a large share in the market. A battery is formed by a plurality of battery monomers in series, parallel or mixed connection.

[0003] The battery includes a plurality of battery monomers. In the current battery monomers, the electrode assembly tab will be impacted during the liquid injection process, resulting in tab misalignment or even tearing, and reducing safety. Utility model content

[0004] Therefore, it is necessary to provide a battery monomer, a battery and an electric device capable of reducing the risk of tab misalignment or even tearing and improving safety.

[0005] In one aspect, the present application provides a battery monomer, which comprises:

[0006] a housing including a shell and an end cover, the end cover being fitted to an opening of the shell, and the end cover being provided with a liquid injection hole;

[0007] an electrode assembly accommodated in the shell; and

[0008] an insulating member accommodated in the shell and arranged between the end cover and the electrode assembly, the insulating member having a first surface facing the end cover, the first surface being provided with a flow guide groove, the flow guide groove extending at least to a side edge of the insulating member arranged along the length direction and / or the width direction of the insulating member;

[0009] wherein the flow guide groove and the liquid injection hole at least partially overlap in the thickness direction of the insulating member.

[0010] In some embodiments, the flow guide groove includes a first flow guide groove extending to opposite side edges of the insulating member along the width direction of the insulating member.

[0011] In some embodiments, the insulating member has a second surface facing away from the end cover; the first surface has an exhaust area provided with an exhaust hole penetrating through the first surface and the second surface;

[0012] The flow guide groove further includes a second flow guide groove, which is communicated between the first flow guide groove and the exhaust hole.

[0013] In some embodiments, the depth of the second flow guide groove gradually increases from the first flow guide groove to the exhaust hole.

[0014] In some embodiments, the exhaust region is arranged along the length direction of the insulating member with the first flow guide groove, and the exhaust region is located in a central region of the insulating member arranged along the length direction and the width direction thereof.

[0015] In some embodiments, the exhaust region has a first convex portion protruding from the second surface and recessed in a direction away from the end cover, the first convex portion abuts against the electrode assembly, and the exhaust hole is located on the first convex portion.

[0016] In some embodiments, the insulating member has a second surface facing away from the end cover;

[0017] The flow guide groove comprises a third flow guide groove extending along the circumferential direction of the insulating member, and a plurality of distribution holes penetrating through the bottom of the third flow guide groove and the second surface are arranged in the third flow guide groove.

[0018] In some embodiments, the insulating member has a second surface facing away from the end cover;

[0019] The flow guide groove is recessed from the first surface to between the first surface and the second surface, or a second convex portion is formed on the side of the insulating member facing away from the end cover, and the flow guide groove is recessed from the first surface to the second convex portion.

[0020] In some embodiments, the width of the flow guide groove is L, and 0.1mm < L ≤ 5mm; and / or

[0021] The flow guide groove is recessed from the first surface to between the first surface and the second surface, the maximum depth of the flow guide groove is H1, the thickness of the insulating member is H2, 0.1mm < H1 < H2, and 0.3H2 ≤ H1 ≤ 0.6H2.

[0022] In some embodiments, the insulating member has a second surface facing away from the end cover;

[0023] A liquid passing hole penetrating through the first surface and the second surface is formed in the insulating member, and the liquid passing hole partially overlaps and communicates with the flow guide groove.

[0024] In some embodiments, the depth of the flow guide groove gradually increases from the liquid passing hole to the side edge of the insulating member.

[0025] In some embodiments, the flow guide groove communicates with the liquid passing hole along a width direction of the flow guide groove, and in the direction, the flow guide groove overlaps the liquid passing hole by a distance W, the liquid passing hole has a diameter D1, and W≥D1 / 2.

[0026] In some embodiments, a plurality of liquid distribution holes are arranged in the flow guide groove, and the liquid distribution holes pass through the groove bottom wall of the flow guide groove and the second surface.

[0027] In some embodiments, the liquid passing hole has a diameter D1, the liquid distribution hole has a diameter D2, and 0.1mm

[0028] In another aspect, the application provides a battery comprising the battery cell as described in any one of the above embodiments.

[0029] In yet another aspect, the application provides an electric device comprising the battery as described in the above embodiments.

[0030] Compared with the prior art, the application has the following beneficial effects:

[0031] The battery cell, the battery and the electric device have the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 FIG. 1 is a structural schematic diagram of an insulating member in an embodiment of the application;

[0033] Figure 2 FIG. 2 is a structural schematic diagram of the insulating member shown in FIG. 1; Figure 1 FIG. 3 is an enlarged schematic diagram of a partial structure A of the insulating member shown in FIG. 1;

[0034] Figure 3 FIG. 4 is an inverted view of the insulating member shown in FIG. 1; Figure 1 FIG. 5 is a structural schematic diagram of an insulating member in another embodiment of the application;

[0035] Figure 4 FIG. 6 is a structural schematic diagram of the insulating member shown in FIG. 5; and

[0036] Figure 5 For Figure 4 A structure diagram of the flow guide groove cooperating with the liquid passage hole is shown in the figure.

[0037] Figure 6 For Figure 4 An inverted view of the insulating piece is shown in the figure.

[0038] Figure 7 A structure diagram of the insulating piece in another embodiment of the present application is shown in the figure.

[0039] Figure 8 A structure diagram of the insulating piece in another embodiment of the present application is shown in the figure.

[0040] Figure 9 For Figure 8 An inverted view of the insulating piece is shown in the figure.

[0041] Reference signs:

[0042] 10, insulating piece;

[0043] 11, flow guide groove; 111, first flow guide groove; 112, second flow guide groove; 113, third flow guide groove; 12, first surface; 13, second surface; 14, exhaust area; 15, exhaust hole; 16, first protrusion; 17, second protrusion; 18, liquid passage hole; 19, liquid separation hole; 21, side edge. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] 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 purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0046] In addition, the terms "first", "second", etc. are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or an ordered sequence. Thus, features defined with "first", "second" etc. can include at least one of each such feature. In the description of the application, the meaning of "a plurality" is at least two, for example, two, three, etc., unless expressly specified and limited otherwise.

[0047] In this application, unless expressly specified and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements or interaction relationship between two elements, unless expressly specified otherwise. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0048] In this application, unless expressly specified and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0049] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0050] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0051] The battery comprises a plurality of battery cells connected in series, parallel or mixed connection. In the current battery cell, the liquid injection process will cause a certain impact on the electrode sheet of the electrode assembly, resulting in dislocation and even tearing of the electrode sheet, and reducing the safety.

[0052] Please refer to Figure 1 and Figure 2 In order to alleviate the above problems, the application provides a battery cell, which comprises a shell, an electrode assembly and an insulating piece 10. The shell comprises a shell body and an end cover, the end cover covers the opening of the shell body, and the end cover is provided with a liquid injection hole. The electrode assembly and the insulating piece 10 are accommodated in the shell body, and the insulating piece 10 is arranged between the end cover and the electrode assembly. The insulating piece 10 has a first surface 12 facing the end cover, and the first surface 12 is provided with a flow guide groove 11 extending at least to the side edge 21 of the insulating piece 10 arranged in the length direction and / or width direction thereof. The normal projection of the flow guide groove 11 and the liquid injection hole in the thickness direction of the insulating piece 10 at least partially overlaps.

[0053] The shell is used to provide an accommodation space for accommodating the electrode assembly and the insulating piece 10. The shell can be a square shell battery, a blade battery or other batteries.

[0054] The electrode assembly is the main component for electrochemical reaction in the battery cell, which comprises a positive electrode sheet, a negative electrode sheet and a separator. The positive electrode sheet and the negative electrode sheet are arranged alternately, and the separator is arranged between the positive electrode sheet and the negative electrode sheet. The above-mentioned electrode sheet can be a positive electrode sheet or a negative electrode sheet.

[0055] The insulating piece 10 is arranged between the electrode assembly and the end cover, and is used to realize the insulation between the electrode assembly and the end cover. Generally, in the thickness direction of the insulating piece 10, the normal projection of the insulating piece 10 completely covers the electrode assembly, so as to ensure that the end cover and the electrode assembly have better insulation effect.

[0056] The normal projection of the flow guide groove 11 and the liquid injection hole in the thickness direction of the insulating piece 10 at least partially overlaps, so that the electrolyte injected from the liquid injection hole of the end cover falls into the flow guide groove 11, and then flows along the flow guide groove 11 and flows down from the side edge 21 of the insulating piece 10 and collects in the shell body. Generally, in the thickness direction of the insulating piece 10, the normal projection of the insulating piece 10 completely covers the electrode assembly, so that the electrolyte falling from the side edge 21 of the insulating piece 10 generally flows into the gap between the electrode assembly and the shell body. This kind of mode can weaken the impact of the electrolyte on the positive electrode sheet and the negative electrode sheet of the electrode assembly, and the possibility of dislocation and tearing of the electrode sheet is reduced, and the safety is improved. In addition, when the electrolyte flows in the flow guide groove 11, the kinetic energy is weakened and the flow speed is slowed down along with the extension of the flow path, so that the impact force when flowing to the gap between the electrode assembly and the shell body is appropriately weakened, and the risk of dislocation and tearing of the positive electrode sheet and the negative electrode sheet is further reduced, and the safety is improved.

[0057] In some embodiments, the flow guide groove 11 includes a first flow guide groove 111 extending to opposite side edges 21 of the insulating piece 10 along the width direction of the insulating piece 10. The insulating piece 10 has a smaller size in the width direction, and the first flow guide groove 111 extending to the two side edges 21 along the width direction of the insulating piece 10 has a shorter length, which is beneficial to improve the flow efficiency of the electrolyte and improve the production efficiency.

[0058] Of course, in other embodiments, the flow guide groove 11 can also extend to the two edges along the length direction of the insulating piece 10, or the flow guide groove 11 is in the shape of a "cross" and extends to each side edge 21 of the insulating piece 10 along the length direction and the width direction of the insulating piece 10.

[0059] Please refer to Figures 1 to 8 In some embodiments, the insulating piece 10 has a second surface 13 facing away from the end cover; the first surface 12 has an exhaust area 14 provided with an exhaust hole 15 penetrating the first surface 12 and the second surface 13; and the flow guide groove 11 further includes a second flow guide groove 112 communicating between the first flow guide groove 111 and the exhaust hole 15.

[0060] The explosion-proof valve is provided on the end cover, and high-temperature flue gas generated by the electrode assembly during operation is sequentially discharged to the outside of the battery monomer through the exhaust hole 15 of the exhaust area 14 and the explosion-proof valve.

[0061] By designing the first flow guide groove 111 and the second flow guide groove 112, the electrolyte can fall through the first flow guide groove 111 and the side edge 21 of the insulating piece 10, or fall through the second flow guide groove 112 and the exhaust hole 15. The first flow guide groove 111 and the second flow guide groove 112 cooperate to divide and guide the electrolyte to fall, have high flow guiding efficiency, and can relieve the impact force on the electrode assembly and reduce the risk of damage to the electrode assembly.

[0062] In some embodiments, the depth of the second flow guide groove 112 gradually increases from the first flow guide groove 111 to the exhaust hole 15. Therefore, the bottom wall of the second flow guide groove 112 forms an inclined surface and can guide the electrolyte to flow to the exhaust hole 15, and the liquid guiding effect is good.

[0063] In some embodiments, the exhaust area 14 and the first flow guide groove 111 are arranged along the length direction of the insulating piece 10, and the exhaust area 14 is located in the central area of the insulating piece 10 along the length direction thereof. In this design, on the one hand, not only can the electrolyte be divided, but also the impact and damage of the electrolyte on the electrode assembly can be reduced, and on the other hand, the electrolyte falling from the exhaust hole 15 spreads in the electrode assembly from the inside to the outside, while the electrolyte falling from the side edge 21 of the insulating piece 10 spreads in the electrode assembly from the outside to the inside, and the cooperation of the two can realize the rapid diffusion of the electrolyte, and the efficiency of the electrode assembly to soak the electrolyte is high.

[0064] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 6 In some embodiments, the exhaust area 14 has a first convex part 16 protruding from the second surface 13 and recessed in the direction away from the end cover, the first convex part 16 abuts against the electrode assembly, and the exhaust hole 15 is located on the first convex part 16. The first convex part 16 corresponds to the position of the explosion-proof valve and is used to abut against the electrode assembly to prevent the electrode assembly from shifting and moving, thereby improving the stability of the electrode assembly in the battery monomer.

[0065] Please refer to Figure 1 and Figure 7 In some embodiments, the flow guide groove 11 includes a third flow guide groove 113 extending along the circumferential direction of the insulating piece 10, and a plurality of distribution holes 19 penetrating the groove bottom of the third flow guide groove 113 and the second surface 13 are arranged in the third flow guide groove 113. The distribution holes 19 in the third flow guide groove 113 also extend along the circumferential direction of the insulating piece 10. In this design, on the one hand, the electrolyte can be output from the two side edges 21 of the insulating piece 10 along the first flow guide groove 111, and on the other hand, the electrolyte flows into the third flow guide groove 113 from the first flow guide groove 111, and then falls from each distribution hole 19 in the third flow guide groove 113 along the circumferential direction of the insulating piece 10, not only the effect of dividing is good, but also the impact force of the electrolyte flowing out of each distribution hole 19 in the third flow guide groove 113 is small, thereby further improving the safety of liquid injection.

[0066] Please refer to Figure 1 , Figure 2 and Figure 9 In some embodiments, the flow guide groove 11 is recessed from the first surface 12 to between the first surface 12 and the second surface 13, or a second convex part 17 is formed on the side of the insulating piece 10 away from the end cover, and the flow guide groove 11 is recessed from the first surface 12 to the second convex part 17. The flow guide grooves 11 formed in the two forms can guide the flow of electrolyte and improve the safety of the battery monomer.

[0067] Please refer to Figure 1 , Figure 2 and Figure 5In some embodiments, the width of the guide groove 11 is L, 0.1mm < L ≤ 5mm; and / or, the guide groove 11 is recessed from the first surface 12 to between the first surface 12 and the second surface 13, the maximum depth of the guide groove 11 is H1, and the thickness of the insulating member 10 is H2, 0.1mm < H1 < H2, and 0.3H2 ≤ H1 ≤ 0.6H2.

[0068] Specifically, L can be, but is not limited to, 0.1mm, 1mm, 2.5mm, 3mm or 5mm, and H1 can be, but is not limited to, 0.3H2, 0.4H2, 0.5H2 or 0.6H2.

[0069] When 0.1mm < L ≤ 5mm, the flow channel 11 has a large area; when 0.1mm < H1 < H2, the flow channel 11 has a large volume. In both cases, the electrolyte flows smoothly within the flow channel 11, resulting in high flow efficiency. When 0.3H2 ≤ H1 ≤ 0.6H2, the flow channel 11 has minimal impact on the strength of the insulating component 10, ensuring its mechanical strength.

[0070] Please see Figure 1 and Figure 2 In some embodiments, the insulating member 10 has a liquid passage hole 18 that passes through the first surface 12 and the second surface 13. The liquid passage hole 18 partially overlaps with and communicates with the guide groove 11.

[0071] For example, with Figure 1 For example, the first guide channel 111 is connected to the liquid passage hole 18.

[0072] The electrolyte passage 18 is connected to the flow channel 11, allowing electrolyte to flow directly into the electrolyte passage 18 through the injection hole or the flow channel 11. The electrolyte passage 18 can divert the electrolyte to reduce the impact force of the electrolyte flowing out of the flow channel 11 from the side edge 21 of the insulating member 10 or the diversion hole 19, thereby improving the safety of the battery cell.

[0073] In some embodiments, the depth of the guide channel 11 gradually increases from the liquid passage hole 18 to the side edge 21 of the insulating member 10. In this way, the bottom wall of the guide channel 11 forms an inclined surface from the liquid passage hole 18 to the side edge 21 of the insulating member 10, which can guide the electrolyte to flow to the side edge 21 of the insulating member 10, resulting in good liquid guiding effect and high liquid guiding efficiency.

[0074] For example, with Figure 1 The middle guide channel 11 includes a first guide channel 111, and the middle position of the first guide channel 111 along its length direction is connected to the liquid passage hole 18. The bottom wall of the guide channel 11 forms an inclined surface from the liquid passage hole 18 to the two side edges 21 of the insulating member 10 along its width direction.

[0075] Please see Figure 1and Figure 5 In some embodiments, the flow guide groove 11 communicates with the liquid passing hole 18 along the width direction of the flow guide groove 11, and in this direction, the distance between the flow guide groove 11 and the liquid passing hole 18 is W, the diameter of the liquid passing hole 18 is D1, and W≥D1 / 2. Specifically, W is D1 / 2, D1 / 1.5, or D1, but is not limited to the listed ratios, and other unlisted ratios within the ratio range are also applicable.

[0076] The more the flow guide groove 11 coincides with the liquid passing hole 18, the greater the possibility that the electrolyte injected through the liquid injection hole of the end cover can be respectively shunted into the liquid passing hole 18 and the flow guide groove 11, the risk of difficult injection is reduced, the injection efficiency is improved, and the drainage effect is good.

[0077] Referring to Figures 4 to 7 In some embodiments, a plurality of liquid distribution holes 19 are arranged in the flow guide groove 11, penetrating the groove bottom wall and the second surface 13 of the flow guide groove 11. For example, a plurality of liquid distribution holes 19 are arranged in the first flow guide groove 111, the second flow guide groove 112, and the third flow guide groove 113, respectively, and all the liquid distribution holes 19 in each of the first flow guide groove 111, the second flow guide groove 112, and the third flow guide groove 113 are arranged at intervals along the extension direction of each. Under this design, the electrolyte can be distributed through all the liquid distribution holes 19, the shunting effect is good, the impact of the electrolyte on the electrode assembly is reduced, and the safety of the injection is improved.

[0078] Referring to Figure 5 In some embodiments, the diameter of the liquid passing hole 18 is D1, the diameter of the liquid distribution hole 19 is D2, and 0.1mm<D2≤D1. Specifically, D2 is 0.1mm or D1, but is not limited to the listed values, and other unlisted values within the value range are also applicable.

[0079] If the diameter of the liquid distribution hole 19 is too small, it is not conducive to the flow of the electrolyte, and if the diameter of the liquid distribution hole 19 is too large, it may cause the tab to pass through the liquid distribution hole 19 and be lapped with the end cover, and the insulation effect of the end cover on the electrode assembly is lost. Therefore, by setting 0.1mm<D2≤D1, the flow of the electrolyte can be ensured, and the risk of short circuit between the electrode assembly and the end cover inside the battery monomer is reduced.

[0080] The application also provides a battery including the battery monomer according to any one of the above embodiments. The battery in the application has the effects brought by any one of the above embodiments, and thus will not be described here.

[0081] The application also provides a power consuming device including the battery according to the above embodiments. The power consuming device in the application has the effects brought by any one of the above embodiments, and thus will not be described here.

[0082] The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0083] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described electric device.

[0084] The above battery monomer, battery, and electric device, the flow guide groove 11 and the liquid injection hole at least partially overlap in the normal projection of the insulating piece 10 in the thickness direction, so that the electrolyte injected from the liquid injection hole of the end cover falls into the flow guide groove 11, and then flows along the flow guide groove 11 and falls from the side edge 21 of the insulating piece 10 and collects in the housing. Generally, in the thickness direction of the insulating piece 10, the normal projection of the insulating piece 10 completely covers the electrode assembly, so that the electrolyte falling from the side edge 21 of the insulating piece 10 generally flows into the gap between the electrode assembly and the housing. This can reduce the impact of the electrolyte on the positive and negative plates of the electrode assembly, reduce the possibility of plate misalignment or tearing, and improve safety. In addition, when the electrolyte flows in the flow guide groove 11, its kinetic energy decreases as the flow path lengthens, and the flow speed slows down, so that the impact force when flowing into the gap between the electrode assembly and the housing is appropriately reduced, further reducing the risk of plate misalignment or tearing, and improving safety.

[0085] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present application.

[0086] The above-described embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be construed as limiting the scope of the patent application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: The outer casing includes a housing and an end cap, wherein the end cap covers the opening of the housing and has an injection hole; Electrode assembly, housed within the housing; and An insulating element is housed within the housing and disposed between the end cap and the electrode assembly. The insulating element has a first surface (12) facing the end cap, and the first surface (12) has a flow channel (11) extending at least to a side edge (21) of the insulating element along its length and / or width. The flow channel (11) and the injection hole at least partially overlap in the orthographic projection of the insulating component in the thickness direction.

2. The battery cell according to claim 1, characterized in that, The guide groove (11) includes a first guide groove (111) which extends along the width direction of the insulating member to the opposite two side edges (21) of the insulating member.

3. The battery cell according to claim 2, characterized in that, The insulating member has a second surface (13) facing away from the end cap; the first surface (12) has an exhaust region (14), and the exhaust region (14) has an exhaust hole (15) that passes through the first surface (12) and the second surface (13). The guide channel (11) further includes a second guide channel (112), which is connected between the first guide channel (111) and the exhaust port (15).

4. The battery cell according to claim 3, characterized in that, The depth of the second guide groove (112) gradually increases from the first guide groove (111) to the exhaust hole (15).

5. The battery cell according to claim 3, characterized in that, The exhaust area (14) and the first guide groove (111) are arranged along the length direction of the insulating member, and the exhaust area (14) is located in the central area of ​​the insulating member along its length and width directions.

6. The battery cell according to claim 3, characterized in that, The exhaust region (14) has a first protrusion (16) recessed in the direction opposite to the end cap and protruding from the second surface (13), the first protrusion (16) abutting against the electrode assembly, and the exhaust hole (15) located on the first protrusion (16).

7. The battery cell according to claim 2, characterized in that, The insulating element has a second surface (13) facing away from the end cap. The flow channel (11) includes a third flow channel (113), which extends circumferentially along the insulating member, and the third flow channel (113) is provided with a plurality of liquid distribution holes (19) that penetrate the bottom of the third flow channel (113) and the second surface (13).

8. The battery cell according to claim 1, characterized in that, The insulating element has a second surface (13) facing away from the end cap. The flow channel (11) is recessed from the first surface (12) to between the first surface (12) and the second surface (13), or the insulating member forms a second protrusion (17) on the side opposite to the end cap, and the flow channel (11) is recessed from the first surface (12) to the second protrusion (17).

9. The battery cell according to claim 8, characterized in that, The width of the guide groove (11) is L, 0.1mm < L ≤ 5mm; and / or The flow guide groove (11) is recessed from the first surface (12) to between the first surface (12) and the second surface (13). The maximum depth of the flow guide groove (11) is H1, and the thickness of the insulating component is H2, 0.1mm < H1 < H2, and 0.3H2 ≤ H1 ≤ 0.6H2.

10. The battery cell according to claim 1 or 2, characterized in that, The insulating element has a second surface (13) facing away from the end cap. The insulating component has a liquid passage hole (18) that passes through the first surface (12) and the second surface (13). The liquid passage hole (18) partially overlaps with and communicates with the guide groove (11).

11. The battery cell according to claim 10, characterized in that, The depth of the guide groove (11) gradually increases from the liquid passage hole (18) to the side edge (21) of the insulating element.

12. The battery cell according to claim 10, characterized in that, The guide groove (11) is connected to the liquid passage hole (18) along its width direction, and in this direction, the distance between the guide groove (11) and the liquid passage hole (18) is W, the diameter of the liquid passage hole (18) is D1, and W≥D1 / 2.

13. The battery cell according to claim 10, characterized in that, The guide channel (11) is provided with a plurality of liquid distribution holes (19) that penetrate the bottom wall of the guide channel (11) and the second surface (13).

14. The battery cell according to claim 13, characterized in that, The diameter of the liquid passage (18) is D1, and the diameter of the liquid distribution hole (19) is D2, where 0.1 mm < D2 ≤ D1.

15. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 14 above.

16. An electrical appliance, characterized in that, Includes the battery as described in claim 15.

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