Battery monomer, battery module, battery and power utilization device

Abstract

The utility model relates to a battery monomer, a battery module, a battery and a power utilization device. The battery monomer comprises a shell and an electrode assembly, the shell comprises a shell and an end cover, the end cover is arranged at one end of the shell and defines a containing cavity with the shell, and the electrode assembly is arranged in the containing cavity and is provided with a central hole; the end cover comprises a main body part and a heat conduction convex part, and the heat conduction convex part protrudes out of one side, facing the electrode assembly, of the main body part and is inserted into the center hole; the end cover is provided with a heat conduction groove, and the heat conduction groove is recessed from one side, back to the electrode assembly, of the main body part to one end, away from the main body part, of the heat conduction convex part. According to the battery monomer, the battery module, the battery and the power utilization device provided by the invention, the heat dissipation speed can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery module, a battery and a power consumption 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, and the heat dissipation of the battery monomers has always been a problem in the industry. The accumulation of heat can cause electrolyte decomposition, reduce the service life of the battery, and even cause safety hazards in serious cases, threatening the safety of life and property. Meanwhile, under the development background of pursuing higher energy density and shorter fast charging time in the industry, fast heat dissipation is one of the problems that must be solved. UTILITY MODEL CONTENT

[0004] Therefore, it is necessary to provide a battery monomer, a battery module, a battery and a power consumption device capable of improving the heat dissipation speed in view of the above problems.

[0005] A battery monomer includes a shell and an electrode assembly, the shell includes a shell body and an end cover, the end cover is arranged at one end of the shell body and forms a containing cavity with the shell body, the electrode assembly is arranged in the containing cavity, and the electrode assembly has a center hole;

[0006] The end cover includes a main body part and a heat conduction protruding part, the heat conduction protruding part protrudes from one side of the main body part towards the electrode assembly and is inserted into the center hole; wherein a heat conduction groove is formed on the end cover, the heat conduction groove is recessed from one side of the main body part away from the electrode assembly to one end of the heat conduction protruding part away from the main body part.

[0007] In some embodiments, the heat conduction protruding part is cylindrical.

[0008] In some embodiments, the circumferential surface of the heat conduction protruding part is in contact with the hole wall of the center hole.

[0009] In some embodiments, the shell body has an end part arranged opposite to the main body part, and the heat conduction protruding part is arranged spaced apart from the end part.

[0010] In some embodiments, the shell body has an end part arranged opposite to the main body part, and the battery monomer further includes an explosion-proof valve and a liquid injection hole, both of which are arranged in the end part.

[0011] A battery module includes:

[0012] The mounting seat comprises a base and at least two heat-conducting protrusions, and a flow channel for flowing cooling medium is arranged in the heat-conducting protrusions.

[0013] The battery cell is at least two according to any one of the above embodiments.

[0014] The heat-conducting protrusions correspond to the battery cells one by one, and the heat-conducting protrusions are clamped in the heat-conducting grooves of the corresponding battery cells.

[0015] In some embodiments, the heat-conducting protrusions and the battery cells are arranged at intervals along the length direction of the base.

[0016] In some embodiments, the base comprises a bearing sub-portion and a limiting sub-portion arranged around the circumference of the bearing sub-portion, and the bearing sub-portion and the limiting sub-portion jointly define a limiting groove, and the heat-conducting protrusions and the battery cells are limited in the limiting groove.

[0017] A battery comprises the battery module according to any one of the above embodiments.

[0018] A power consumption device comprises the battery according to the above embodiments.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The battery cell, the battery module, the battery and the power consumption device have the following beneficial effects: the heat-conducting groove is inserted into the center hole of the electrode assembly, the heat inside the electrode assembly is diffused to the outside by heat conduction, and the heat dissipation efficiency is greatly improved. In addition, the shell and the main body part assist heat dissipation, the heat dissipation speed is improved, and the heat dissipation efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a structural schematic diagram of a battery cell in an embodiment of the present application;

[0022] Figure 2 FIG. 2 is a top view of the battery cell shown in FIG. 1; Figure 1

[0023] Figure 3 FIG. 4 is a sectional view of the battery cell shown in FIG. 1 along the A-A direction; Figure 2

[0024] Figure 4 FIG. 6 is a structural schematic diagram of a mounting seat in an embodiment of the present application;

[0025] Figure 5 FIG. 7 is a structural schematic diagram of a battery module in an embodiment of the present application;

[0026] REFERENCE NUMERALS:​​

[0027] 1000, battery module;

[0028] 100, battery cell; 200, mounting seat;

[0029] 10, shell; 11, housing; 111, end portion; 12, end cover; 121, main body portion; 122, heat conduction protrusion; 123, heat conduction groove; 13, accommodating cavity; 20, electrode assembly; 21, center hole;

[0030] 210, base; 211, bearing sub-portion; 212, limiting sub-portion; 220, heat conduction protrusion; 230, limiting groove. DETAILED DESCRIPTION

[0031] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application.

[0032] 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 therefore cannot be understood as indicating or implying 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 limiting the present application.

[0033] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0034] In the present application, unless specifically defined otherwise and limited, the terms "mount", "connect", "connection", "fixed", and like terms should be construed in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. 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.

[0035] In the present application, unless specifically defined otherwise and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature 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 the first feature 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.

[0036] It should be noted that when an element is referred to as "fixed to" or "provided to" 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 implementation.

[0037] 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 water power, fire power, wind power and solar power station, but also widely applied to electric bicycle, electric motorcycle, electric vehicle 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.

[0038] Please see Figures 1 to 3 , the battery includes a plurality of battery monomers 100, and the heat dissipation of the battery monomer 100 has been a problem in the industry. The accumulation of heat can cause electrolyte decomposition, reduce the service life of the battery, and even cause safety hazards in serious cases, threatening the safety of personnel and property. At the same time, under the development background of the industry pursuing higher energy density and shorter fast charging time, fast heat dissipation is one of the problems that must be solved.

[0039] In order to improve the heat dissipation effect, the application provides a battery monomer 100, which can be a cylindrical battery monomer 100, a square shell battery monomer 100, etc., and the specific shape is not limited here.

[0040] The battery monomer 100 includes a shell 10 and an electrode assembly 20, the shell 10 includes a shell body 11 and an end cover 12, the end cover 12 is arranged at one end of the shell body 11 and forms a containing cavity 13 with the shell body 11, the electrode assembly 20 is arranged in the containing cavity 13, and the electrode assembly 20 has a center hole 21. The end cover 12 includes a main body part 121 and a heat conduction protruding part 122, the heat conduction protruding part 122 protrudes from one side of the main body part 121 towards the electrode assembly 20 and is inserted into the center hole 21; wherein a heat conduction groove 123 is arranged on the end cover 12, the heat conduction groove 123 is recessed from one side of the main body part 121 away from the electrode assembly 20 to one end of the heat conduction protruding part 122 away from the main body part 121.

[0041] The electrode assembly 20 is the main component of the electrochemical reaction occurring inside the battery monomer 100, which is enclosed in the containing cavity 13 of the shell 10 and is formed by winding the whole after stacking the positive plate, the negative plate and the separator film. The electrode assembly 20 after winding has a center hole 21.

[0042] The shell 10 is used to provide the containing cavity 13 for containing the electrode assembly 20. The shell body 11 of the shell 10 is a hollow structure with one end open and one end closed, the main body part 121 of the end cover 12 covers the opening of the shell body 11 and forms the containing cavity 13 with the shell body 11, and the heat conduction protruding part 122 is located in the containing cavity 13 and is inserted into the center hole 21. The heat conduction protruding part 122 is generally made of metal material with certain mechanical strength and better heat conduction performance, such as aluminum material. The heat conduction protruding part 122 and the main body part 121 can be integrally formed or separately formed.

[0043] The heat conduction groove 123 is arranged on the end cover 12 and can be formed by hollowing out or stamping, and the heat conduction groove 123 is in communication with the outside. In actual work, the heat inside the electrode assembly 20 is diffused to the outside through the heat conduction groove 123 to achieve heat dissipation inside the electrode assembly 20.

[0044] For the traditional battery monomer 100, the main problem is that only the surface of the battery monomer 100 can be heat dissipated, and the inside of the battery monomer 100 where the heat is generated and accumulated most seriously cannot be heat dissipated. In the application, the heat conduction groove 123 is inserted into the center hole 21 of the electrode assembly 20, and the heat inside the electrode assembly 20 is diffused to the outside by heat conduction, so that the heat dissipation efficiency is greatly improved. In addition, the shell body 11 and the main body part 121 can assist heat dissipation, which can improve the heat dissipation speed and has high heat dissipation efficiency.

[0045] In some embodiments, the heat-conducting protrusion 122 is cylindrical, and the side circumferential surface of the cylindrical heat-conducting protrusion 122 is relatively smooth, so that the heat-conducting protrusion 122 is not easy to scratch or pierce the hole wall of the central hole 21 during insertion of the heat-conducting protrusion 122 into the central hole 21. It can be understood that the hole wall of the central hole 21 is formed by one of the positive electrode sheet, the negative electrode sheet, and the separator film, and when the positive electrode sheet, the negative electrode sheet, and the separator film are not scratched or pierced, the electrode assembly 20 can maintain its normal working performance.

[0046] Of course, in other embodiments, the shape of the heat-conducting protrusion 122 is not limited to the above, for example, the heat-conducting protrusion 122 can also be conical, and the large end of the conical heat-conducting protrusion 122 is connected with the main body 121, and the small end is arranged away from the main body 121. The heat-conducting protrusion 122 of this structure is convenient to insert into the central hole 21.

[0047] In some embodiments, the side circumferential surface of the heat-conducting protrusion 122 is in contact with the hole wall of the central hole 21. The heat-conducting protrusion 122 has good heat conductivity, and when the heat-conducting protrusion 122 is in contact with the hole wall of the central hole 21, the heat generated by the electrode assembly 20 can be quickly conducted to the heat-conducting protrusion 122. On the one hand, the heat can be directly diffused to the outside through the heat-conducting grooves 123 on the heat-conducting protrusion 122, and on the other hand, the heat on the heat-conducting protrusion 122 can also be transmitted to the outside through the main body 121. The heat conduction path is increased, and the heat dissipation efficiency is further improved.

[0048] Of course, in other embodiments, a gap can also be provided between the heat-conducting protrusion 122 and the hole wall of the central hole 21, and the gap between the side circumferential surface of the heat-conducting protrusion 122 and the hole wall of the central hole 21 is small, so as to ensure the reliability of heat conduction.

[0049] In some embodiments, the shell 11 has an end portion 111 arranged opposite to the main body 121, and the heat-conducting protrusion 122 is spaced apart from the end portion 111, so as to avoid the heat-conducting protrusion 122 from being in contact with the end portion 111 to form a short circuit, thereby improving the safety of the battery monomer 100.

[0050] In some embodiments, the battery monomer 100 further comprises an explosion-proof valve and a liquid injection hole, and the explosion-proof valve and the liquid injection hole are arranged on the end portion 111. Since the end portion 111 is not provided with the groove of the heat-conducting groove 123, the area of the end portion 111 for arranging the explosion-proof valve and the liquid injection hole is larger, so that the explosion-proof valve and the liquid injection hole can be conveniently arranged.

[0051] Please refer to Figures 3 to 5The application further provides a battery module 1000, which comprises a mounting base 200 and the battery cell 100 according to any one of the above embodiments. The mounting base 200 comprises a base portion 210 and at least two heat-conducting protrusions 220, the heat-conducting protrusions 220 are provided with flow channels for the circulation of cooling medium, and the battery module 100 comprises at least two battery cells, wherein the heat-conducting protrusions 220 correspond to the battery cells 100 one by one, and the heat-conducting protrusions 220 are clamped in the heat-conducting grooves 123 of the corresponding battery cells 100.

[0052] The heat-conducting protrusions 220 are generally made of metal materials with certain mechanical strength and good heat-conducting performance, for example, aluminum materials, and the heat-conducting protrusions 220 can be integrally formed with the base portion 210 or separately formed.

[0053] Specifically, the heat-conducting protrusions 220 can be single-layer pipes or double-layer pipes. Taking the single-layer pipes as an example, the inner walls of the single-layer pipes define the flow channels. Taking the double-layer pipes as an example, the flow channels are defined between the inner layer and the outer layer of the double-layer pipes. The flow channels are in communication with the external medium source, so that the cooling medium can circulate in the external medium source and the flow channels. Alternatively, the cooling medium can be water, alcohol or other fluids that can be used for heat dissipation.

[0054] The heat-conducting protrusions 220 have heat-conducting performance, and during the circulation of the cooling medium in the external medium source and the flow channels, the heat of the electrode assembly 20 can be transferred to the cooling medium through the heat-conducting protrusions 122 and the heat-conducting protrusions 220, so as to take away the heat inside the electrode assembly 20, thereby achieving the purpose of quickly cooling the battery cell 100. Moreover, the heat-conducting protrusions 220 can also assist in the positioning of the battery cell 100, so as to reduce the positioning tolerance in the battery module 1000.

[0055] In some embodiments, the heat-conducting protrusions 220 and the battery cells 100 are arranged along the length direction of the base portion 210. This kind of arrangement can set as many battery cells 100 as possible, improve the energy density of the battery module 1000, and reduce the mutual influence of the heat between the battery cells 100, thereby improving the safety.

[0056] In some embodiments, the base portion 210 comprises a bearing sub-portion 211 and a limiting sub-portion 212 arranged around the bearing sub-portion 211 in the circumferential direction, and the bearing sub-portion 211 and the limiting sub-portion 212 jointly define a limiting groove 230, and the heat-conducting protrusions 122 and the battery cells 100 are limited in the limiting groove 230. The limiting groove 230 can limit the battery cells 100, thereby reducing the risk of falling off of the battery cells 100 from the base portion 210 during transportation or use, and improving the reliability of the installation of the battery cells 100.

[0057] The application also provides a battery including the battery module 1000 according to any one of the above embodiments. The battery in the application has the effects of any one of the above embodiments, and thus will not be described here.

[0058] The application also provides an electric device including the battery according to any one of the above embodiments. The electric device in the application has the effects of any one of the above embodiments, and thus will not be described here.

[0059] 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, etc. 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, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0060] It should be understood that the technical solutions described in the embodiments of the application are not limited to the above-described electric devices.

[0061] The battery cell 100, the battery module 1000, the battery, and the electric device described above have the heat dissipation groove 123 inserted into the center hole 21 of the electrode assembly 20, and the heat inside the electrode assembly 20 is diffused to the outside by heat conduction, so that the heat dissipation efficiency is greatly improved. In addition, the shell 11 and the main body 121 can assist in heat dissipation, which can improve the heat dissipation speed and has high heat dissipation efficiency.

[0062] 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 exist, they should be considered as the scope of the description.

[0063] The above-described embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A battery cell, characterized in that, The battery cell includes a housing (10) and an electrode assembly (20). The housing (10) includes a shell (11) and an end cap (12). The end cap (12) is disposed at one end of the shell (11) and defines a receiving cavity (13) with the shell (11). The electrode assembly (20) is disposed in the receiving cavity (13) and has a central hole (21). The end cap (12) includes a main body (121) and a heat-conducting protrusion (122). The heat-conducting protrusion (122) protrudes from the side of the main body (121) facing the electrode assembly (20) and is inserted into the central hole (21). The end cap (12) is provided with a heat-conducting groove (123). The heat-conducting groove (123) is recessed from the side of the main body (121) away from the electrode assembly (20) to the end of the heat-conducting protrusion (122) away from the main body (121).

2. The battery cell according to claim 1, characterized in that, The heat-conducting protrusion (122) is cylindrical.

3. The battery cell according to claim 1, characterized in that, The peripheral side of the heat-conducting protrusion (122) is in contact with the hole wall of the central hole (21).

4. The battery cell according to claim 1, characterized in that, The housing (11) has an end (111) disposed opposite to the main body (121), and the heat-conducting protrusion (122) is spaced apart from the end (111).

5. The battery cell according to claim 1, characterized in that, The housing (11) has an end (111) disposed opposite to the main body (121), and the battery cell further includes an explosion-proof valve and an injection hole, both of which are disposed at the end (111).

6. A battery module, characterized in that, The battery module includes: The mounting base (200) includes a base (210) and at least two thermally conductive protrusions (220), wherein the thermally conductive protrusions (220) are provided with channels for the flow of cooling medium; and The battery cell as described in any one of claims 1 to 5 above, wherein there are at least two battery cells; The thermally conductive protrusion (220) corresponds one-to-one with the battery cell, and the thermally conductive protrusion (220) is held in the thermally conductive groove (123) of the corresponding battery cell.

7. The battery module according to claim 6, characterized in that, The thermally conductive protrusions (220) and the battery cells are arranged at intervals along the length of the base (210).

8. The battery module according to claim 6, characterized in that, The base (210) includes a support sub-part (211) and a limiting sub-part (212) arranged circumferentially around the support sub-part (211). The support sub-part (211) and the limiting sub-part (212) together define a limiting groove (230). The heat-conducting protrusion (122) and the battery cell are limited within the limiting groove (230).

9. A battery, characterized in that, Includes the battery module as described in any one of claims 6 to 8 above.

10. An electrical device, characterized in that, Includes the battery as described in claim 9 above.

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