Top cover lower plastic structure and battery
By setting annular and auxiliary circulation grooves in the plastic structure under the top cover, the problem of uneven electrolyte injection in lithium-ion batteries is solved, achieving uniform distribution of electrolyte and improving battery safety.
Patent Information
- Application Number
- CN202422408641.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-09-30
AI Technical Summary
In the prior art, when injecting electrolyte into lithium-ion batteries, the injection effect of the battery cell is poor, resulting in difficulty in uniform distribution of the electrolyte, which may cause the battery cell separator to fall off.
An annular flow groove, multiple auxiliary flow grooves, and a target flow groove aligned with the top cover injection hole are set on the first side of the plastic structure under the top cover. The electrolyte flows slowly and evenly into the battery cell through these grooves, forming a buffer zone to improve the injection effect.
The electrolyte infiltration effect on the battery cell is improved, which avoids the diaphragm from falling off due to the direct impact of the electrolyte on the battery cell, and ensures the safety and uniform injection of the battery.
Smart Images
Figure CN223333873U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a plastic structure under a top cover and a battery. Background Art
[0002] At present, lithium-ion batteries have the advantages of safety, high efficiency, pollution-free, high specific energy, abundant raw materials, many cycles and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras and laptops, but also widely used in large and medium-sized electric equipment such as electric vehicles, electric bicycles and power tools. Therefore, the safety requirements for lithium-ion batteries are becoming increasingly higher.
[0003] Currently, when injecting electrolyte into a battery cell, the electrolyte is directly injected into the battery cell through an injection hole on a top cover of the battery, resulting in poor electrolyte injection effect. Utility Model Content
[0004] The present invention provides a plastic structure under the top cover and a battery. This solves the problem of poor electrolyte injection in the prior art battery cells. The technical solution is as follows:
[0005] In one aspect, a plastic structure under a top cover is provided, the plastic structure under the top cover comprising:
[0006] The plastic structure under the top cover includes a first side surface and a second side surface arranged opposite to each other, wherein the first side surface is used to connect with the top cover of the battery;
[0007] The plastic structure under the top cover has an annular circulation groove, a target circulation groove, a plurality of auxiliary circulation grooves located on the first side surface, a first through hole located on the bottom surface of the annular circulation groove and communicating with the annular circulation groove, and a second through hole located on the bottom surface of the auxiliary circulation groove and communicating with the auxiliary circulation groove;
[0008] The annular circulation groove is distributed at the edge of the plastic structure under the top cover, the target circulation groove and the plurality of auxiliary circulation grooves are both located within the area enclosed by the annular circulation groove, the plurality of auxiliary circulation grooves are connected to both the target circulation groove and the annular circulation groove, and the extension direction of some of the plurality of auxiliary circulation grooves intersects with the extension direction of another portion of the auxiliary circulation grooves;
[0009] Wherein, the target flow groove is used to be arranged corresponding to the liquid injection hole of the top cover and communicate with each other.
[0010] Optionally, the notch of the annular circulation groove, the notch of the target circulation groove, and the notches of the plurality of auxiliary circulation grooves are flush with each other.
[0011] Optionally, the plastic structure under the top cover is rectangular, and the annular circulation groove includes: two first circulation grooves arranged opposite to each other along a first direction, and two second circulation grooves arranged opposite to each other along a second direction, the two first circulation grooves and the two second circulation grooves are connected end to end in sequence, the extension direction of the first circulation groove is parallel to the short side of the plastic structure under the top cover, and the extension direction of the second circulation groove is parallel to the long side of the plastic structure under the top cover; the first direction is perpendicular to the second direction;
[0012] Wherein, the depth of the first circulation groove is greater than the depth of the second circulation groove.
[0013] Optionally, there are multiple first through holes, a portion of the multiple first through holes are arrayed along the extension direction of the first circulation groove, and another portion of the multiple first through holes are arrayed along the extension direction of the second circulation groove.
[0014] Optionally, the plurality of auxiliary circulation grooves include: a plurality of third circulation grooves distributed along the first direction, the extension direction of the third circulation grooves is parallel to the first circulation grooves, and both ends of the third circulation grooves are respectively connected to the two second circulation grooves;
[0015] Among the plurality of third flow grooves, there is one third flow groove located in the central area of the first side surface, and a portion of the outermost third flow groove among the plurality of third flow grooves is reused with a portion of the target flow groove.
[0016] Optionally, the plurality of auxiliary circulation grooves further include: two fourth circulation grooves distributed along the first direction, wherein the extension direction of the fourth circulation groove is parallel to the extension direction of the second circulation groove;
[0017] The two fourth flow grooves are respectively cross-arranged and connected with the two outermost third flow grooves among the plurality of third flow grooves, and one end of the two fourth flow grooves extends to the third flow groove located in the central area of the first side.
[0018] Optionally, there are multiple second through holes, a portion of the multiple second through holes are arranged in an array along the extension direction of the third flow groove, and another portion of the multiple second through holes are arranged in an array along the extension direction of the fourth flow groove.
[0019] Optionally, the plastic structure under the top cover further has: two pole through holes for connecting the positive pole and the negative pole of the battery.
[0020] In another aspect, a battery is provided, comprising:
[0021] A top cover, a plastic structure under the top cover and a battery cell, wherein the plastic structure under the top cover is connected to one side of the top cover, and the battery cell is located on the side of the plastic structure under the top cover away from the top cover, and the plastic structure under the top cover is the plastic structure under the top cover described above.
[0022] Optionally, the top cover has an explosion-proof valve, and an orthographic projection of the explosion-proof valve on the first side surface has an overlapping area with the third flow groove located in the central area of the first side surface.
[0023] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:
[0024] A plastic structure under a top cover is provided with an annular flow groove, multiple auxiliary flow grooves, and a target flow groove aligned with the injection hole of the top cover on the first side surface of the plastic structure under the top cover. In this way, when injecting liquid, the injection port of the injection device is aligned with the injection hole on the top cover and injection is performed. The electrolyte with a certain pressure will first flow to the target flow groove, that is, the target flow groove can serve as a buffer area where the electrolyte can accumulate. Then, the electrolyte flows under the guidance of the annular flow groove and the multiple auxiliary flow grooves and flows evenly and slowly through the first through hole and the second through hole to the upper part of the battery cell, so that the upper part of the battery cell contacts the electrolyte for a longer time, thereby improving the infiltration effect of the battery. In addition, the undesirable phenomenon of the battery cell diaphragm falling off due to the electrolyte directly impacting the battery cell is avoided. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0026] Figure 1 This is an exploded schematic diagram of a plastic structure under a top cover and a top cover provided in an embodiment of the present application;
[0027] Figure 2 yes Figure 1 Schematic diagram of the arrangement of the flow grooves in the plastic structure under the top cover shown in FIG;
[0028] Figure 3 This is a schematic structural diagram of a plastic structure under a top cover provided in an embodiment of the present application;
[0029] Figure 4This is a schematic diagram of the arrangement of the circulation grooves of another plastic structure under the top cover provided in an embodiment of the present application;
[0030] Figure 5 This is a schematic diagram of an explosion of a battery provided in an embodiment of the present application.
[0031] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION
[0032] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.
[0033] Please refer to Figure 1 and Figure 2 , Figure 1 This is an exploded schematic diagram of a plastic structure under a top cover and a top cover provided in an embodiment of the present application. Figure 2 yes Figure 1 The figure shows the layout of the flow grooves in the plastic structure under the top cover. This plastic structure 000 can be integrated into a battery and located between the top cover and the battery cells, providing a certain degree of insulation. The plastic structure 000 includes a first side surface m1 and a second side surface m2 that are arranged opposite each other. The first side surface m1 of the plastic structure 000 can be used to connect to the top cover 001 in the battery.
[0034] The plastic structure 000 under the top cover may have an annular circulation groove 100 located at the first side surface m1, a target circulation groove 200, a plurality of auxiliary circulation grooves 300, and a first through hole a1 located on the bottom surface of the annular circulation groove 100 and capable of communicating with the annular circulation groove 100, and a second through hole a2 located on the bottom surface of the auxiliary circulation groove 300 and capable of communicating with the auxiliary circulation groove 300.
[0035] The annular circulation groove 100 can be distributed at the edge of the plastic structure 000 under the top cover, and the target circulation groove 200 and the plurality of auxiliary circulation grooves 300 can both be located within the area enclosed by the annular circulation groove 100. The plurality of auxiliary circulation grooves 300 are connected to both the target circulation groove 200 and the annular circulation groove 100, and the extension direction of some of the plurality of auxiliary circulation grooves 300 can intersect with the extension direction of another portion of the auxiliary circulation grooves 300.
[0036] The target flow groove 200 can be used to be arranged corresponding to the liquid injection hole b1 of the top cover 001 and communicate with each other.
[0037] In the embodiment of the present application, an annular flow groove 100, a plurality of auxiliary flow grooves 300, and a target flow groove 200 for aligning with the injection hole b1 of the top cover 001 are provided on the first side surface m1 of the plastic structure 000 under the top cover. In this way, when injecting liquid, the injection port of the injection device is aligned with the injection hole b1 on the top cover 001 and the liquid is injected. The electrolyte with a certain pressure will first flow to the target flow groove 200, that is, the target flow groove 200 can be used as a buffer zone, and the electrolyte can accumulate in this area; then, these electrolytes flow under the guidance of the plurality of auxiliary flow grooves 300 and the annular flow groove 100 and flow evenly and slowly into the upper part of the battery cell through the first through hole a1 and the second through hole a2, so that the time the upper part of the battery cell contacts the electrolyte becomes longer, thereby achieving a better infiltration effect of the battery. In addition, the undesirable phenomenon of the battery cell diaphragm falling off due to the electrolyte directly impacting the battery cell is avoided.
[0038] In summary, the embodiment of the present application provides a plastic structure under the top cover, by setting an annular circulation groove, a plurality of auxiliary circulation grooves, and a target circulation groove for aligning with the injection hole of the top cover on the first side of the plastic structure under the top cover. In this way, when injecting liquid, the injection port of the injection device is aligned with the injection hole on the top cover and the liquid is injected. The electrolyte with a certain pressure will first flow to the target circulation groove, that is, the target circulation groove can be used as a buffer zone, and the electrolyte can accumulate in this area; then, these electrolytes flow under the guidance of the annular circulation groove and the plurality of auxiliary circulation grooves and flow into the upper part of the battery cell evenly and slowly through the first through hole and the second through hole, so that the time that the upper part of the battery cell contacts the electrolyte becomes longer, thereby making the battery infiltration effect better. In addition, the undesirable phenomenon of the battery cell diaphragm falling off caused by the electrolyte directly impacting the battery cell is avoided.
[0039] Optionally, the notches of the annular circulation groove 100, the notches of the target circulation groove 200, and the notches of the plurality of auxiliary circulation grooves 300 in the plastic structure 000 under the top cover can be flush with each other. In this way, by arranging the notches of the annular circulation groove 100, the notches of the target circulation groove 200, and the notches of the plurality of auxiliary circulation grooves 300 in the plastic structure 000 under the top cover to be flush with each other, after the first side m1 of the plastic structure 000 under the top cover contacts the top cover 001, the electrolyte flows substantially only within the electrolyte circulation channel formed by the top cover 001 and the various circulation grooves in the plastic structure 000 under the top cover, thereby ensuring a good electrolyte injection effect and preventing the electrolyte from splashing to other areas.
[0040] For examples, please refer to Figure 3 , Figure 3Schematic diagram of a plastic structure under a top cover provided in an embodiment of the present application. The second side surface m2 of the plastic structure under the top cover 000 may have a first protrusion T1 corresponding to the annular circulation groove 100, a second protrusion T2 corresponding to the target circulation groove 200, and a plurality of third protrusions T3 corresponding one-to-one with the plurality of auxiliary circulation grooves 300. Here, the distribution of the first protrusion T1, the second protrusion T2, and the third protrusion T3 can be combined to reveal the distribution of the annular circulation groove 100, the distribution of the target circulation groove 200, and the distribution of the plurality of auxiliary circulation grooves 300.
[0041] In the examples of this application, please refer to Figure 4 , Figure 4 This is a schematic diagram of the arrangement of the circulation grooves of another plastic structure under the top cover provided in an embodiment of the present application. The plastic structure 000 under the top cover can be rectangular, and the annular circulation groove 100 can include: two first circulation grooves 101 arranged opposite each other along a first direction f1, and two second circulation grooves 102 arranged opposite each other along a second direction f2. The two first circulation grooves 101 and the two second circulation grooves 102 can be connected end to end. The extension direction of the first circulation groove 101 can be parallel to the short side of the plastic structure 000 under the top cover, and the extension direction of the second circulation groove 102 can be parallel to the long side of the plastic structure 000 under the top cover. The first direction f1 can be perpendicular to the second direction f2. The depth of the first circulation groove 101 can be greater than the depth of the second circulation groove 102. In this way, by setting two first flow grooves 101 and two second flow grooves 102 at the edge position of the first side surface m1 of the plastic structure 000 under the top cover, and the depth of the first flow groove 101 is greater than the depth of the second flow groove 102, the edge area of the battery cell can also be sprayed with electrolyte, and more electrolyte can flow into the first flow groove 101, ensuring smooth flow of electrolyte in other flow grooves.
[0042] In this application, if Figure 4 As shown, the number of first through holes a1 can be multiple, and a portion of the multiple first through holes a1 can be arranged in an array along the extension direction of the first circulation groove 101, and another portion of the multiple first through holes a1 can be arranged in an array along the extension direction of the second circulation groove 102. In this way, the array arrangement of the multiple first through holes a1 further ensures that the electrolyte can be evenly sprayed to the upper part of the battery cell in the battery, thereby ensuring a better battery infiltration effect. For example, a portion of the multiple first through holes a1 can be evenly spaced along the extension direction of the first circulation groove 101, and another portion of the multiple first through holes a1 can be evenly spaced along the extension direction of the second circulation groove 102.
[0043] Optional, such as Figure 4 As shown, the multiple auxiliary circulation grooves 300 in the plastic structure 000 under the top cover can include: multiple third circulation grooves 301 distributed along a first direction f1. The third circulation grooves 301 can extend parallel to the first circulation grooves 101, and the ends of the third circulation grooves 301 can respectively communicate with the two second circulation grooves 102. Among the multiple third circulation grooves 301, one third circulation groove 301 can be located in the central region of the first side m1 of the plastic structure 000 under the top cover, and the portion of the outermost third circulation groove among the multiple third circulation grooves can be reused with the portion of the target circulation groove. For example, the third circulation groove located in the central region of the first side m1 of the plastic structure 000 under the top cover is the third circulation groove A1. In this way, the electrolyte flowing into the target circulation groove 200 through the top cover's injection hole can flow and diffuse through the multiple third circulation grooves 301 and the annular circulation groove 100, ensuring uniform electrolyte spraying while regulating the electrolyte infiltration rate.
[0044] In the embodiments of this application, Figure 4 As shown, the plurality of auxiliary flow grooves 300 may further include: two fourth flow grooves 302 distributed along the first direction f1, and the extension direction of the fourth flow grooves 302 may be parallel to the extension direction of the second flow groove 102. The two fourth flow grooves 302 may respectively intersect and communicate with the two outermost third flow grooves 301 among the plurality of third flow grooves 301, and one end of each of the two fourth flow grooves 302 may extend to the third flow groove A1 located in the central area of the first side surface m1 of the plastic structure 000 under the top cover.
[0045] In this application, if Figure 4 As shown, the number of second through holes a2 can be multiple, and a portion of the multiple second through holes a2 can be arranged in an array along the extension direction of the third circulation groove 301, and another portion of the multiple second through holes a2 can be arranged in an array along the extension direction of the fourth circulation groove 302. In this way, the array arrangement of the multiple second through holes a2 further ensures that the electrolyte can be evenly sprayed onto the upper portion of the battery cells in the battery, thereby ensuring a better battery wetting effect. For example, a portion of the multiple second through holes a2 can be evenly spaced along the extension direction of the third circulation groove 301, and another portion of the multiple second through holes a2 can be evenly spaced along the extension direction of the fourth circulation groove 302.
[0046] It should be noted that in order to ensure better wetting effect on the battery, the aperture of the first through hole a1 distributed on the annular circulation groove 100 can be 0.1 mm to 2 mm, and the aperture of the second through hole a2 distributed on the auxiliary circulation groove 300 can be 0.1 mm to 2 mm.
[0047] Optional, such as Figure 4 As shown, the plastic structure 000 under the top cover may also have two electrode through-holes 400 for connecting the positive electrode and the negative electrode of the battery. The positive electrode and the negative electrode may be electrically connected to the positive electrode sheet and the negative electrode sheet in the battery cell respectively through the two electrode through-holes 400.
[0048] In summary, the embodiment of the present application provides a plastic structure under the top cover, by setting an annular circulation groove, a plurality of auxiliary circulation grooves, and a target circulation groove for aligning with the injection hole of the top cover on the first side of the plastic structure under the top cover. In this way, when injecting liquid, the injection port of the injection device is aligned with the injection hole on the top cover and the liquid is injected. The electrolyte with a certain pressure will first flow to the target circulation groove, that is, the target circulation groove can be used as a buffer zone, and the electrolyte can accumulate in this area; then, these electrolytes flow under the guidance of the annular circulation groove and the plurality of auxiliary circulation grooves and flow into the upper part of the battery cell evenly and slowly through the first through hole and the second through hole, so that the time that the upper part of the battery cell contacts the electrolyte becomes longer, thereby making the battery infiltration effect better. In addition, the undesirable phenomenon of the battery cell diaphragm falling off caused by the electrolyte directly impacting the battery cell is avoided.
[0049] The present application also provides a battery, please refer to Figure 5 , Figure 5Schematic diagram of an explosion of a battery provided in an embodiment of the present application. The battery 00 may include: a top cover 001, a plastic structure 000 under the top cover, and a battery cell 002. The plastic structure 000 under the top cover may be connected to one side of the top cover 001. The battery cell 002 may be located on the side of the plastic structure 000 facing away from the top cover 001. The plastic structure 000 under the top cover may be any of the above-mentioned plastic structures. For example, the top cover 001 may contact and connect with the first side m1 of the plastic structure 000 under the top cover, and the second side m2 of the plastic structure 000 under the top cover may contact the edge of the battery cell 002. Thus, by providing an annular flow groove 100, a plurality of auxiliary flow grooves 300, and a target flow groove 200 for aligning with the injection hole b1 of the top cover 001 on the first side surface m1 of the plastic structure 000 under the top cover, when injecting liquid, the injection port of the injection device is aligned with the injection hole on the top cover and the liquid is injected. The electrolyte with a certain pressure will first flow to the target flow groove, that is, the target flow groove can serve as a buffer zone, and the electrolyte can accumulate in this area; then, these electrolytes flow under the guidance of the annular flow groove and the plurality of auxiliary flow grooves and flow evenly and slowly through the first through hole and the second through hole to the upper part of the battery cell, so that the time the upper part of the battery cell contacts the electrolyte is prolonged, thereby achieving a better infiltration effect of the battery. In addition, the undesirable phenomenon of the battery cell diaphragm falling off due to the electrolyte directly impacting the battery cell is avoided.
[0050] In the present application, the battery 00 may further include: a bottom shell 003 and a protective film 004 wrapping the battery cell 002. The protective film 004 may be installed in the bottom shell 003 after wrapping the battery cell 002, and is used to carry the electrolyte.
[0051] In this embodiment of the present application, the top cover 001 of the battery may include an explosion-proof valve 001a. The orthographic projection of the explosion-proof valve 001a on the first side m1 of the plastic structure 000 under the top cover may overlap with the third flow groove A1 located in the center of the first side m1 of the plastic structure 000 under the top cover. This allows for the discharge of a large amount of hot gas from the explosion-proof valve 001a through the second through hole a2 in the event of thermal runaway in the battery cell 002, mitigating potential safety hazards in the battery 00.
[0052] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it may be the only layer between the two layers or elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.
[0053] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless expressly limited otherwise.
[0054] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.
Claims
1. A plastic structure under the top cover, characterized in that: The plastic structure under the top cover includes a first side surface and a second side surface arranged opposite to each other, wherein the first side surface is used to connect with the top cover of the battery; The plastic structure under the top cover has an annular circulation groove, a target circulation groove, a plurality of auxiliary circulation grooves located on the first side surface, a first through hole located on the bottom surface of the annular circulation groove and communicating with the annular circulation groove, and a second through hole located on the bottom surface of the auxiliary circulation groove and communicating with the auxiliary circulation groove; The annular circulation groove is distributed at the edge of the plastic structure under the top cover, the target circulation groove and the plurality of auxiliary circulation grooves are both located within the area enclosed by the annular circulation groove, the plurality of auxiliary circulation grooves are connected to both the target circulation groove and the annular circulation groove, and the extension direction of some of the plurality of auxiliary circulation grooves intersects with the extension direction of another portion of the auxiliary circulation grooves; Wherein, the target flow groove is used to be arranged corresponding to the liquid injection hole of the top cover and communicate with each other.
2. The plastic structure under the top cover according to claim 1, characterized in that: The notch of the annular circulation groove, the notch of the target circulation groove, and the notches of the plurality of auxiliary circulation grooves are flush with each other.
3. The plastic structure under the top cover according to claim 2, characterized in that: The plastic structure under the top cover is rectangular, and the annular circulation groove includes: two first circulation grooves arranged opposite to each other along a first direction, and two second circulation grooves arranged opposite to each other along a second direction, the two first circulation grooves and the two second circulation grooves being connected end to end, the first circulation groove extending in a direction parallel to the short side of the plastic structure under the top cover, and the second circulation groove extending in a direction parallel to the long side of the plastic structure under the top cover; the first direction is perpendicular to the second direction; Wherein, the depth of the first circulation groove is greater than the depth of the second circulation groove.
4. The plastic structure under the top cover according to claim 3, characterized in that: There are multiple first through holes, a portion of which are arrayed along the extension direction of the first circulation groove, and another portion of which are arrayed along the extension direction of the second circulation groove.
5. The plastic structure under the top cover according to claim 3, characterized in that: The plurality of auxiliary flow grooves include: a plurality of third flow grooves distributed along the first direction, the extension direction of the third flow grooves is parallel to the first flow grooves, and both ends of the third flow grooves are respectively connected to the two second flow grooves; Among the plurality of third flow grooves, there is one third flow groove located in the central area of the first side surface, and a portion of the outermost third flow groove among the plurality of third flow grooves is reused with a portion of the target flow groove.
6. The plastic structure under the top cover according to claim 5, characterized in that: The plurality of auxiliary flow grooves further include: two fourth flow grooves distributed along the first direction, wherein the extension direction of the fourth flow grooves is parallel to the extension direction of the second flow grooves; The two fourth flow grooves are respectively cross-arranged and connected with the two outermost third flow grooves among the plurality of third flow grooves, and one end of the two fourth flow grooves extends to the third flow groove located in the central area of the first side.
7. The plastic structure under the top cover according to claim 6, characterized in that: There are multiple second through holes, a portion of which are arranged in an array along the extension direction of the third flow groove, and another portion of which are arranged in an array along the extension direction of the fourth flow groove.
8. The plastic structure under the top cover according to any one of claims 1 to 7, characterized in that: The plastic structure under the top cover also has two pole through holes for connecting the positive pole and the negative pole of the battery.
9. A battery, characterized in that: include: A top cover, a plastic structure under the top cover, and a battery cell, wherein the plastic structure under the top cover is connected to one side of the top cover, and the battery cell is located on a side of the plastic structure under the top cover facing away from the top cover, and the plastic structure under the top cover is the plastic structure under the top cover described in any one of claims 1 to 8.
10. The battery according to claim 9, characterized in that The top cover has an explosion-proof valve, and an orthographic projection of the explosion-proof valve on the first side surface has an overlapping area with the third flow groove located in the central area of the first side surface.