Battery monomer and battery pack

Abstract

The utility model provides a battery monomer and a battery pack, and relates to the technical field of batteries. The single battery comprises a shell with a containing cavity, a cover plate connected with the shell to seal the containing cavity, a pole penetrating through the cover plate, and an electrode assembly arranged in the containing cavity. The electrode assembly comprises an electrode body and a tab which are connected with each other, and a bent part of the tab is located on one side, close to the cover plate, of the electrode body and connected with one side, away from the electrode body, of the first pole part of the pole. According to the battery monomer provided by the invention, through the arrangement of the first pole part, the tab can be assisted to be bent, and the bent part of the tab can be restrained, so that the risk that the bent part is inserted into the electrode body is reduced, and the safety of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] With the development of battery technology, the safety requirements for individual battery cells are becoming increasingly stringent. During the manufacturing process of a battery cell, it is necessary to assemble the electrode components and bend the tabs of the electrode components to facilitate their installation into the housing. However, the bent portion of the tab can easily insert into the electrode body, causing a short circuit and thus affecting the safety of the battery cell. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem that the bent part of the electrode tab can easily be inserted into the electrode body, causing a short circuit.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0007] The shell has a receiving cavity;

[0008] A cover plate is connected to the housing to seal the receiving cavity;

[0009] An electrode post is disposed through the cover plate, and the electrode post includes a first electrode post portion located within the receiving cavity;

[0010] An electrode assembly is disposed within the receiving cavity. The electrode assembly includes an electrode body and a tab connected to each other. The tab has a bent portion located on the side of the electrode body near the cover plate. The bent portion is connected to the side of the first electrode post opposite to the electrode body.

[0011] In one embodiment of the first aspect, the electrode post further includes a second electrode post connected to the first electrode post portion, the second electrode post portion being disposed through the cover plate, the first electrode post portion being disposed circumferentially around the second electrode post portion, and the bent portion being welded to the side of the first electrode post portion away from the electrode body and extending toward the second electrode post portion.

[0012] In one embodiment of the first aspect, a receiving groove is provided on the side of the first electrode post away from the electrode body, the receiving groove being recessed in the direction close to the electrode body, and the end of the bent portion near the second electrode post is located in the receiving groove.

[0013] In one embodiment of the first aspect, the receiving groove is disposed near the second pole post portion, and the portion of the bent portion near the second pole post portion is wound within the receiving groove.

[0014] In one embodiment of the first aspect, the battery cell further includes a first insulating member located within the receiving cavity, the first insulating member being connected to the side of the cover plate near the electrode body, the second electrode post being disposed through the first insulating member, and the bent portion being located between the first insulating member and the first electrode post.

[0015] In one embodiment of the first aspect, the battery cell further includes a protective layer located within the receiving cavity, the protective layer being disposed over the end of the first electrode portion away from the second electrode portion, and a portion of the protective layer being located between the bent portion and the end of the first electrode portion away from the second electrode portion.

[0016] In one embodiment of the first aspect, an arc-shaped portion is provided at the end of the first pole portion away from the second pole portion.

[0017] In one embodiment of the first aspect, the battery cell further includes a second insulating member located outside the receiving cavity, the second terminal portion includes a first terminal segment and a second terminal segment connected together, the second insulating member is disposed between the first terminal segment and the cover plate, the second terminal segment passes through the cover plate, and the second terminal segment is integrally formed with the first terminal portion.

[0018] In one embodiment of the first aspect, a groove is provided on the outer peripheral side of the first pole section, and a portion of the second insulating member is disposed in the groove.

[0019] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0020] The beneficial effects of this application are as follows:

[0021] In the battery cell provided in this application, the bent portion of the tab is located between the first electrode post and the cover plate, and the bent portion is connected to the side of the first electrode post away from the electrode assembly to realize the electrical connection between the electrode assembly and the electrode post. Through the above-mentioned setting of the first electrode post, it can assist the tab in bending and constrain the bent portion of the tab, thereby reducing the risk of the bent portion being inserted into the electrode body, thus improving the safety of the battery cell.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 An exploded structural diagram of a battery cell in one embodiment of this application is shown;

[0025] Figure 2 A three-dimensional structural schematic diagram of a battery cell in one embodiment of this application is shown;

[0026] Figure 3 It shows Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0027] Figure 4 It shows Figure 3 A magnified structural diagram of region B in the middle;

[0028] Figure 5 It shows Figure 4 A schematic diagram of a structure with an added protective layer;

[0029] Figure 6 It shows Figure 4 A schematic diagram of the structure with an added receiving groove.

[0030] Explanation of key component symbols:

[0031] 100-Battery cell; 110-Casing; 111-Receiving cavity; 120-Cover plate; 130-Terminal post; 131-Second terminal post portion; 1311-First terminal post segment; 1312-Second terminal post segment; 1313-Groove; 132-First terminal post portion; 133-Receiving groove; 134-Arc-shaped portion; 140-Electrode assembly; 141-Electrode body; 142-Electrode tab; 1421-Bending portion; 150-Protective layer; 160-Second insulating component; 170-First insulating component; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0032] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0033] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0036] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In the description of this application, the term "and / or" indicates that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0038] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0039] The battery cell is a crucial component of a power battery pack. With the development of battery technology, the safety requirements for battery cells are becoming increasingly stringent. During the manufacturing process of a battery cell, it is necessary to assemble the electrode components (i.e., combine multiple electrode components together) and bend the tabs of the electrode components to facilitate their assembly into the housing.

[0040] However, the bent portion of the tab can easily insert into the electrode body, causing a short circuit and affecting the safety of the battery cell. Furthermore, the bent portion of the tab needs to be connected to the terminal post via an adapter, which occupies internal space in the casing, thus affecting the energy density of the battery cell.

[0041] like Figure 1 and Figure 2 As shown, in order to solve the above-mentioned technical problems, embodiments of this application provide a battery cell 100, which relates to the field of battery technology and is mainly used in battery packs for application in electrical devices or energy storage devices. Of course, the battery cell 100 can also be directly applied to electrical devices or energy storage devices without using a battery pack; no specific limitations are made on the application scenarios of the battery cell 100 here.

[0042] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, and new energy vehicles, with new energy vehicles including pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles; spacecraft can be airplanes, rockets, space shuttles, drones, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers; energy storage devices include energy storage containers and energy storage power stations; no specific restrictions are placed on the types of electrical devices and energy storage devices here.

[0043] like Figures 1 to 4 As shown, the battery cell 100 provided in this embodiment includes: a housing 110, a cover plate 120, a terminal post 130, and an electrode assembly 140.

[0044] The housing 110 has a receiving cavity 111; the cover plate 120 is connected to the housing 110 to cover the receiving cavity 111; the electrode post 130 is disposed through the cover plate 120, and the electrode post 130 includes a first electrode post portion 132 located in the receiving cavity 111; the electrode assembly 140 is disposed in the receiving cavity 111, and the electrode assembly 140 includes an electrode body 141 and an electrode tab 142 connected to each other, the electrode tab 142 has a bent portion 1421, the bent portion 1421 is located on the side of the electrode body 141 near the cover plate 120, and the bent portion 1421 is connected to the side of the first electrode post portion 132 away from the electrode body 141.

[0045] It is understood that in the battery cell 100 provided in this embodiment, the bent portion 1421 of the tab 142 is located between the first electrode post 132 and the cover plate 120, and the bent portion 1421 is connected to the side of the first electrode post 132 away from the electrode assembly 140 to realize the electrical connection between the electrode assembly 140 and the electrode post 130. Through the above-mentioned arrangement of the first electrode post 132, it can assist the tab 142 in bending and constrain the bent portion 1421 of the tab 142, thereby reducing the risk of the bent portion 1421 being inserted into the electrode body 141, thus improving the safety of the battery cell 100. In addition, since the bent portion 1421 of the tab 142 is directly connected to the electrode post 130, the use of an adapter plate can be eliminated, which is beneficial to improving the energy density of the battery cell 100.

[0046] like Figures 2 to 4As shown, in one embodiment, the electrode post 130 further includes a second electrode post 131 connected to the first electrode post 132. The second electrode post 131 is disposed through the cover plate 120. The first electrode post 132 is disposed circumferentially around the second electrode post 131. The bent portion 1421 is on the side of the first electrode post 132 away from the electrode body 141 and extends toward the second electrode post 131.

[0047] Understandably, the arrangement of the second electrode post 131 facilitates the connection between the electrode post 130 and the busbar, thereby enabling series or parallel connection between two adjacent battery cells 100. By circumferentially arranging the first electrode post 132 around the second electrode post 131, i.e., the first electrode post 132 is located on the outer periphery of the second electrode post 131, the space occupied by the electrode post 130 in the third direction Z can be reduced, which is beneficial to improving the energy density of the battery cell 100. The bending portion 1421 extends towards the second electrode post 131, which reduces the length redundancy of the bending portion 1421, allowing it to be inserted into the electrode body.

[0048] like Figure 6 As shown, the first electrode post 132 is further provided with a receiving groove 133 on the side away from the electrode body 141. The receiving groove 133 is recessed in the direction close to the electrode body 141, and the end of the bent part 1421 near the second electrode post 131 is located in the receiving groove 133.

[0049] Understandably, since the first pole post 132 has a recessed receiving groove 133 on the side away from the electrode assembly 140 along the direction close to the electrode assembly 140, and the end of the bent portion 1421 near the second pole post 131 is located in the receiving groove 133, the possibility of structural interference between the bent portion 1421 and the second pole post 131 due to length redundancy can be reduced. At the same time, the formation of the receiving groove 133 can increase the elasticity of the first pole post 132 in the third direction Z, so as to reduce the risk of tensile breakage at the connection between the bent portion 1421 and the first pole post 132 under vibration conditions.

[0050] like Figure 6 As shown, the receiving groove 133 is further disposed near the second pole post 131, and the portion of the bent portion 1421 near the second pole post 131 is wound around and disposed in the receiving groove 133, so that the receiving groove 133 can better accommodate the redundant portion of the bent portion 1421, thereby further reducing the possibility of structural interference between the bent portion 1421 and the second pole post 131 due to the redundant length.

[0051] like Figure 2 , Figure 3 and Figure 6As shown, the battery cell 100 further includes a first insulating member 170 located in the receiving cavity 111. The first insulating member 170 is connected to the side of the cover plate 120 near the electrode body 141. The second electrode post 131 is disposed through the first insulating member 170. The bent portion 1421 is located between the first insulating member 170 and the first electrode post 132.

[0052] It is understandable that since the first insulating member 170 is located inside the receiving cavity 111 and connected to the side of the cover plate 120 near the electrode body 141, and the bent portion 1421 is located between the first insulating member 170 and the first pole portion 132, the bent portion 1421 and the cover plate 120 can be insulated from each other to reduce the possibility of short circuit.

[0053] like Figure 2 , Figure 3 and Figure 5 As shown, in a specific embodiment, the battery cell 100 further includes a protective layer 150 located in the receiving cavity 111. The protective layer 150 is disposed over the end of the first electrode portion 132 away from the second electrode portion 131, and a portion of the protective layer 150 is located between the bent portion 1421 and the end of the first electrode portion 132 away from the second electrode portion 131.

[0054] For example, the protective layer 150 can be a layered structure with elastic deformation capabilities, such as a silicone layer, a rubber layer, or a sponge layer, without any specific limitations.

[0055] It is understandable that by covering the end of the first pole piece 132 away from the second pole piece 131 with a protective layer 150, and by placing a portion of the protective layer 150 between the bending portion 1421 and the end of the first pole piece 132 away from the second pole piece 131, the possibility of the tab 142 being scratched by the end of the second pole piece 131 away from the second pole piece 131 during the bending process of the tab 142 to form the bending portion 1421 can be reduced.

[0056] like Figure 4 As shown, in another specific embodiment, an arc-shaped portion 134 is provided at the end of the first pole post 132 away from the second pole post 131. The arc-shaped portion 134 can increase the smoothness of the end of the second pole post 131 away from the second pole post 131, and can also reduce the possibility that the pole tab 142 will be scratched by the end of the second pole post 131 away from the second pole post 131 during the process of bending the tab 142 to form the bent portion 1421.

[0057] It should be noted that the first electrode post 132 may be equipped with the aforementioned arc-shaped part 134 and protective layer 150 at the same time. The combination of the two can better reduce the possibility of the tab 142 being scratched by the first electrode post 132, and improve the performance of the battery cell 100.

[0058] like Figure 2 , Figure 3 and Figure 5 As shown, the battery cell 100 further includes a second insulating member 160 located outside the receiving cavity 111. The second terminal portion 131 includes a first terminal segment 1311 and a second terminal segment 1312 connected to each other. The second insulating member 160 is disposed between the first terminal segment 1311 and the cover plate 120. The second terminal segment 1312 passes through the cover plate 120. The second terminal segment 1312 and the first terminal portion 132 are integrally formed.

[0059] Understandably, by providing the second insulating member 160 between the first electrode segment 1311 and the cover plate 120, the first electrode segment 1311 and the cover plate 120 can be insulated from each other, reducing the risk of short circuit. By integrally forming the second electrode segment 1312 with the first electrode portion 132, that is, by integrally forming the second electrode segment 1312 and the first electrode portion 132 when manufacturing the electrode 130, the stability of the first electrode portion 132 can be increased, so that the first electrode portion 132 can better constrain the bent portion 1421, further reducing the possibility of the bent portion 1421 being inserted into the electrode body 141.

[0060] like Figure 5 As shown, a groove 1313 is further provided on the outer periphery of the first pole post 1311, and a part of the second insulating member 160 is disposed in the groove 1313. This can effectively limit the relative movement of the pole post 130 and the second insulating member 160, so that the pole post 130 has higher stability.

[0061] It should be noted that the first insulating element 170 and / or the second insulating element 160 can be made of materials with insulating properties such as plastics and ceramics. No specific restrictions are placed on the materials of the first insulating element 170 and / or the second insulating element 160.

[0062] like Figures 1 to 4 As shown, in one embodiment, multiple electrode assemblies 140 are provided, and the multiple electrode assemblies 140 are arranged along the second direction Y. Each electrode assembly 140 has multiple tabs 142 arranged at intervals along the first direction X. Multiple pole posts 130 are provided, and the multiple pole posts 130 are arranged at intervals along the first direction X. The first pole post portion 132 of each pole post 130 corresponds to a portion of the tabs 142 on the multiple electrode assemblies 140, thereby constraining the bending portion 1421 of each tab 142 of the multiple electrode assemblies 140 through the first pole post portions 132 of the multiple pole posts 130.

[0063] It should be noted that the first direction X, the second direction Y, and the third direction Z are mutually perpendicular to each other; for example, when the battery cell 100 has a length direction, a width direction, and a height direction, the length direction is parallel to the first direction X, the width direction is parallel to the second direction Y, and the height direction is parallel to the third direction Z.

[0064] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the battery cell 100 from any of the above embodiments.

[0065] It is understood that since the battery pack provided in this embodiment has the battery cell 100 in any of the above embodiments, it has all the beneficial effects of the battery cell 100, which will not be described in detail here.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing (110) has a receiving cavity (111); A cover plate (120) is connected to the housing (110) to seal the receiving cavity (111); A pole post (130) is disposed through the cover plate (120), and the pole post (130) includes a first pole post portion (132) located in the receiving cavity (111); An electrode assembly (140) is disposed within the receiving cavity (111). The electrode assembly (140) includes an electrode body (141) and a tab (142) connected to each other. The tab (142) has a bent portion (1421) located on the side of the electrode body (141) near the cover plate (120). The bent portion (1421) is connected to the side of the first pole piece (132) opposite to the electrode body (141).

2. The battery cell according to claim 1, characterized in that, The electrode post (130) further includes a second electrode post (131) connected to the first electrode post (132). The second electrode post (131) is disposed through the cover plate (120). The first electrode post (132) is disposed circumferentially around the second electrode post (131). The bent portion (1421) is welded to the side of the first electrode post (132) away from the electrode body (141) and extends toward the second electrode post (131).

3. The battery cell according to claim 2, characterized in that, The first electrode post (132) has a receiving groove (133) on the side away from the electrode body (141). The receiving groove (133) is recessed in the direction close to the electrode body (141), and the bent part (1421) is located in the receiving groove (133) at one end near the second electrode post (131).

4. The battery cell according to claim 3, characterized in that, The receiving groove (133) is disposed near the second pole post (131), and the portion of the bent portion (1421) near the second pole post (131) is wound around the receiving groove (133).

5. The battery cell according to claim 2, characterized in that, The battery cell also includes a first insulating member (170) located in the receiving cavity (111). The first insulating member (170) is connected to the cover plate (120) on the side near the electrode body (141). The second electrode post (131) is disposed through the first insulating member (170). The bent portion (1421) is located between the first insulating member (170) and the first electrode post (132).

6. The battery cell according to claim 2, characterized in that, The battery cell also includes a protective layer (150) located in the receiving cavity (111). The protective layer (150) is disposed over the end of the first electrode portion (132) away from the second electrode portion (131). A portion of the protective layer (150) is located between the bent portion (1421) and the end of the first electrode portion (132) away from the second electrode portion (131).

7. The battery cell according to claim 2, characterized in that, An arc-shaped portion (134) is provided at the end of the first pole post (132) away from the second pole post (131).

8. The battery cell according to any one of claims 2 to 7, characterized in that, The battery cell also includes a second insulating member (160) located outside the receiving cavity (111). The second terminal portion (131) includes a first terminal segment (1311) and a second terminal segment (1312) connected to each other. The second insulating member (160) is disposed between the first terminal segment (1311) and the cover plate (120). The second terminal segment (1312) passes through the cover plate (120). The second terminal segment (1312) and the first terminal portion (132) are integrally formed.

9. The battery cell according to claim 8, characterized in that, A groove (1313) is provided on the outer periphery of the first pole section (1311), and a portion of the second insulating member (160) is disposed in the groove (1313).

10. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 9.

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