A single cell and a battery pack

Abstract

The application discloses a single battery and a battery pack, and relates to the technical field of batteries. The single battery comprises a shell, a top cover, a first electrode assembly and an insulation layer. The top cover is connected with the shell, and a pole is arranged on the top cover; the first electrode assembly is arranged in the shell, and comprises an electrode main body and a tab connected with each other, the tab is located at one end of the electrode main body close to the top cover, and the tab comprises a first bending part; the insulation layer is arranged in the shell, and comprises an insulation main body and a first supporting part connected with each other, the insulation main body is wrapped outside the electrode main body, the first supporting part is connected with one end of the insulation main body close to the top cover, the first bending part is arranged in the insulation layer, the first bending part arranged in the insulation layer is located at one side of the first supporting part away from the electrode main body in a first direction, and the first bending part is electrically connected with the pole. The single battery provided by the application effectively improves the production efficiency of the single battery.

Description

Technical Field

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

[0002] In related technologies, to avoid the risk of internal short circuits caused by the insertion of the tab into the battery cell during assembly and later application, an insulating support is typically installed between the bent and folded portions of the tab to insulate and support the bent portion. However, installing an insulating support between the bent and folded portions of the tab increases the battery assembly steps, thus affecting battery production efficiency. Utility Model Content

[0003] In order to achieve the above objectives, this application aims to provide a single-cell battery that solves the technical problem in the prior art where the installation of an insulating support between the bent and folded portions of the electrode increases the battery assembly steps, thereby affecting battery production efficiency.

[0004] The technical solution adopted is as follows: In a first aspect, embodiments of this application provide a single-cell battery, comprising: case; A top cover is connected to the housing, and an electrode post is provided on the top cover; A first electrode assembly is disposed within the housing. The first electrode assembly includes a connected electrode body and a tab. The tab is located at one end of the electrode body near the top cover, and the tab includes a first bend. An insulating layer is disposed within the housing. The insulating layer includes a connected insulating body and a first support portion. The insulating body is wrapped around the electrode body. The first support portion is connected to one end of the insulating body near the top cover. A first bent portion passes through the insulating layer. The first bent portion passing through the insulating layer is located on the side of the first support portion away from the electrode body along the first direction, and the first bent portion is electrically connected to the electrode post.

[0005] In one embodiment of the first aspect, the insulating body includes a top insulating portion located at one end of the electrode body near the top cover, and the first support portion is connected to the side of the top insulating portion away from the electrode body, and the first bent portion passes through the top insulating portion and is electrically connected to the pole post.

[0006] In one embodiment of the first aspect, the single cell further includes a second electrode assembly, the second electrode assembly being arranged with the first electrode assembly along the first direction, the insulating layer further includes a second support portion, the second support portion being disposed opposite to the first support portion along the first direction; the second electrode assembly further includes a second bent portion, the second bent portion being disposed opposite to the first bent portion along the first direction, the second bent portion passing through the insulating layer, the second bent portion passing through the insulating layer being located on the side of the second support portion away from the electrode body along the first direction, and the second bent portion being electrically connected to the electrode post.

[0007] In one embodiment of the first aspect, the single cell has a center line, the first support portion is bent in a direction away from the center line, and the second support portion is bent in a direction away from the center line.

[0008] In one embodiment of the first aspect, the insulating body further includes an abutting portion connected to the top insulating portion, the abutting portion being located at one end of the top insulating portion away from the first support portion and protruding in a direction away from the first support portion, abutting against one end of the electrode body near the top cover.

[0009] In one embodiment of the first aspect, the single cell has a second direction, and the top insulating portion has a through hole extending along the second direction, the first bent portion passing through the through hole and electrically connected to the electrode post.

[0010] In one embodiment of the first aspect, the single cell has a second direction, and the insulating body further includes a side insulating portion and a bottom insulating portion. The side insulating portion is disposed in the circumferential direction of the electrode body, and the two ends of the side insulating portion along the second direction are connected to the top insulating portion and the bottom insulating portion.

[0011] In one embodiment of the first aspect, the single cell further includes an adhesive layer disposed on the side of the first support portion near the first bending portion and bonded to the first bending portion.

[0012] In one embodiment of the first aspect, the first support portion and the insulating body are integrally formed.

[0013] Secondly, embodiments of this application also provide a battery pack, including the single battery cells described in any of the above embodiments.

[0014] The beneficial effects of this application are as follows: This application proposes a single-cell battery, which includes a casing, a top cover, a first electrode assembly, and an insulating layer. The top cover is connected to the casing and has electrode posts. The first electrode assembly and the insulating layer are both disposed inside the casing. The first electrode assembly includes a connected electrode body and a tab. The tab is located at the end of the electrode body near the top cover and includes a first bend. The insulating layer includes a connected insulating body and a first support portion. By wrapping the insulating body around the electrode body, the electrical gap between the electrode body and the casing is isolated, preventing the electrode body from contacting the casing and causing a short circuit inside the single-cell battery.

[0015] Meanwhile, by connecting the first support portion to one end of the insulating body near the top cover, and inserting the first bent portion through the insulating layer and positioning it on the side of the first support portion away from the electrode body along the first direction, and electrically connecting the first bent portion to the electrode post, the first support portion supports and constrains the first bent portion, keeping the bending position of the first bent portion fixed. This prevents the electrode body from being inserted into the first bent portion, thus avoiding internal short circuits in the single cell and ensuring the safety performance of the single cell. The single cell provided in this application has the first support portion, which supports and constrains the first bent portion, integrally formed with the insulating body. This eliminates the assembly step of separately setting an insulating support between the bent portion and the folded portion of the electrode tab, as required in the prior art, effectively improving the production efficiency of the single cell. Attached Figure Description

[0016] 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.

[0017] Figure 1 The diagram shows a cross-sectional view of a single cell in some embodiments of this application; Figure 2 A cross-sectional schematic diagram of the insulating layer is shown in some embodiments of this application.

[0018] Explanation of key component symbols: 100-cell battery; 110 - Casing; 120 - Top cover; 121 - Pole post; 130 - First electrode assembly; 131 - Electrode body; 132 - Tab; 1322 - First bending portion; 140 - Insulation layer; 1411 - First support part; 1412 - Second support part; 142 - Insulation body; 1421 - Top surface insulation part; 14211 - Through hole; 1422 - Abutting part; 1423 - Side insulation part; 1424 - Bottom surface insulation part; 150 - Second electrode assembly; 151 - Second bend; 160 - Adhesive layer; X - First direction; Z - Second direction; P - Centerline. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these 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.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are 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, and therefore should not be construed as a limitation of this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "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 specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "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.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "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 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 that the first feature is at a lower horizontal level than the second feature.

[0024] like Figure 1 and Figure 2 As shown, an embodiment of this application provides a single-cell battery 100, mainly used in battery packs. The single-cell battery 100 includes a housing 110, a top cover 120, a first electrode assembly 130, and an insulating layer 140.

[0025] The top cover 120 is connected to the housing 110. An electrode post 121 is disposed on the top cover 120. A first electrode assembly 130 is disposed within the housing 110. The first electrode assembly 130 includes a connected electrode body 131 and an electrode tab 132. The electrode tab 132 is located at the end of the electrode body 131 near the top cover 120 and includes a first bent portion 1322. An insulating layer 140 is disposed within the housing 110. The insulating layer 140 includes a connected insulating body 142 and a first support portion 1411. The insulating body 142 wraps around the electrode body 131. The first support portion 1411 is connected to the end of the insulating body 142 near the top cover 120. The first bent portion 1322 passes through the insulating layer 140 and is located on the side of the first support portion 1411 facing away from the electrode body along a first direction. The first bent portion 1322 is electrically connected to the electrode post 121.

[0026] The single cell 100 provided in the embodiments of this application has an insulating layer 140 including an insulating body 142 and a first support portion 1411 connected together. By wrapping the insulating body 142 around the electrode body 131, the electrical gap between the electrode body 131 and the housing 110 is isolated, preventing the electrode body 131 from contacting the housing 110 and causing an internal short circuit in the single cell 100.

[0027] Meanwhile, by connecting the first support portion 1411 to one end of the insulating body 142 near the top cover 120, the first bent portion 1322 is inserted through the insulating layer 140 and located on the side of the first support portion 1411 away from the electrode body 131 along the first direction X, and the first bent portion 1322 is electrically connected to the electrode post 121, so that the first support portion 1411 supports and constrains the first bent portion 1322, keeping the bending position of the first bent portion 1322 fixed, thereby preventing the first bent portion 1322 from being inserted into the electrode body 131 and causing an internal short circuit in the single cell 100, thus ensuring the safety performance of the single cell 100. The single cell 100 provided in this application has the first support portion 1411, which supports and constrains the first bent portion 1322, integrally formed with the insulating body 142, eliminating the assembly step of separately setting an insulating support between the bent portion and the folded portion of the electrode tab in the prior art, effectively improving the production efficiency of the single cell.

[0028] For example, the first support portion 1411 and the insulating body 142 can be integrally formed from polyester film or polyimide film material, and the integral forming method can be bending or stamping integral forming.

[0029] like Figure 1 and Figure 2 As shown, in one embodiment of this application, the insulating body 142 includes a top insulating portion 1421, which is located at one end of the electrode body 131 near the top cover 120. The first support portion 1411 is connected to the side of the top insulating portion 1421 away from the electrode body 131, and the first bent portion 1322 passes through the top insulating portion 1421 and is electrically connected to the pole post 121.

[0030] In this embodiment, by providing a top insulating portion 1421 at one end of the electrode body 131 near the top cover 120, and connecting the first support portion 1411 to the side of the top insulating portion 1421 away from the electrode body 131, the electrical gap between the electrode body 131 and the top cover 120 is isolated, preventing the electrode body 131 from contacting the top cover 120 and causing an internal short circuit in the single cell 100. By passing a first bent portion 1322 through the top insulating portion 1421 and electrically connecting it to the electrode post 121, the electrode body 131 is electrically connected to the electrode post 121 via the tab 132, thereby forming the electrode of the single cell 100, and thus realizing the charging and discharging of the single cell 100. At the same time, the top insulating portion 1421 can also isolate the first bent portion 1322 and the electrode body 131, thereby further reducing the probability of the electrode body 131 being inserted into the first bent portion 1322 and causing an internal short circuit in the single cell 100.

[0031] like Figure 1 and Figure 2As shown in the above embodiments of this application, the single cell 100 further includes a second electrode assembly 150, which is arranged with the first electrode assembly 130 along the first direction X. The insulating layer 140 further includes a second support portion 1412, which is disposed opposite to the first support portion 1411 along the first direction X. The second electrode assembly 150 further includes a second bending portion 151, which is disposed opposite to the first bending portion 1322 along the first direction X. The second bending portion 151 passes through the insulating layer 140 and is located on the side of the second support portion 1412 away from the electrode body 131 along the first direction X. The second bending portion 151 is electrically connected to the electrode post.

[0032] In this embodiment, the second electrode assembly 150 and the first electrode assembly 130 are arranged along the first direction X, the second support portion 1412 and the first support portion 1411 are arranged opposite each other along the first direction X, and the second bending portion 151 and the first bending portion 1322 are arranged opposite each other along the first direction X. By passing the second bending portion 151 through the insulating layer 140 and being located on the side of the second support portion 1412 away from the electrode body 131 along the first direction X, and electrically connecting the second bending portion 151 to the electrode post 121, the second support portion 1412 supports and constrains the second bending portion 151, keeping the bending position of the second bending portion 151 fixed, thereby preventing the electrode body from being inserted into the second bending portion 151 and causing a short circuit inside the single cell 100, thus ensuring the safety performance of the single cell 100. The single cell 100 provided in this application has a second support portion 1412 that supports and constrains the second bending portion 151, which is integrally formed with the insulating body 142. This eliminates the assembly step of separately setting an insulating support between the bending portion and the folding portion of the electrode in the prior art, and effectively improves the production efficiency of the single cell.

[0033] For example, the second support portion 1412 and the insulating body 142 can be integrally formed from polyester film or polyimide film material, and the integral forming method can be bending or stamping integral forming.

[0034] like Figure 1 and Figure 2 As shown in the above embodiments of this application, the single cell 100 has a center line P, the first support portion 1411 bends in a direction away from the center line P, and the second support portion 1412 bends in a direction away from the center line P.

[0035] In this embodiment, by bending the first support portion 1411 in a direction away from the center line P to match the bending shape of the first bent portion 1322, the support and constraint effect on the first bent portion 1322 is improved. Simultaneously, by bending the second support portion 1412 in a direction away from the center line P to match the bending shape of the second bent portion 151, the support and constraint effect on the second bent portion 151 is improved.

[0036] like Figure 1 As shown, in the above embodiments of this application, the insulating body 142 further includes an abutment portion 1422 connected to the top surface insulating portion 1421. The abutment portion 1422 is located at one end of the top surface insulating portion 1421 away from the first support portion 1411 and protrudes in the direction away from the first support portion 1411, abutting against one end of the electrode body 131 near the top cover 120.

[0037] In this embodiment, by providing the abutment portion 1422 at one end of the top insulating portion 1421 away from the first support portion 1411, and protruding in the direction away from the first support portion 1411 and abutting against the end of the electrode body 131 near the top cover 120, the electrode body 131 is stably disposed in the insulating body 142 under the abutment action of the abutment portion 1422 against the electrode body 131, so as to ensure the stability and reliability of the single cell 100 in use.

[0038] like Figure 1 As shown, in the above embodiments of this application, the single cell 100 has a second direction Z, and the top insulating portion 1421 is provided with a through hole 14211 extending along the second direction Z. The first bent portion 1322 passes through the through hole 14211 and is electrically connected to the terminal post 121.

[0039] In this embodiment, a through hole 14211 is opened in the top insulating part 1421 so that the first bent part 1322 passes through the through hole 14211 and connects with the electrode post 121, thereby making the electrode body 131 electrically connected to the electrode post 121 through the electrode tab 132 to form the electrode of the single cell 100, thereby realizing the charging and discharging of the single cell 100.

[0040] like Figure 1 As shown in the above embodiments of this application, the single cell 100 has a second direction Z, and the insulating body 142 further includes a side insulating portion 1423 and a bottom insulating portion 1424. The side insulating portion 1423 is disposed in the circumferential direction of the electrode body 131, and the two ends of the side insulating portion 1423 along the second direction Z are connected to the top insulating portion 1421 and the bottom insulating portion 1424.

[0041] In this embodiment, by providing the side insulating portion 1423 around the electrode body 131, the electrical gap between the circumferential wall of the electrode body 131 and the inner circumferential wall of the housing 110 is isolated, preventing the circumferential wall of the electrode body 131 from contacting the inner circumferential wall of the housing 110 and causing an internal short circuit in the single cell 100. Simultaneously, by connecting the two ends of the side insulating portion 1423 along the second direction Z to the top insulating portion 1421 and the bottom insulating portion 1424 respectively, the bottom insulating portion 1424 isolates the electrical gap between the end of the electrode body 131 away from the top insulating portion 1421 and the inner bottom wall of the housing 110, preventing the end of the electrode body 131 away from the top insulating portion 1421 from contacting the inner bottom wall of the housing 110 and causing an internal short circuit in the single cell 100.

[0042] For example, the first support portion 1411, the top insulating portion 1421, the side insulating portion 1423 and the bottom insulating portion 1424 can be integrally formed from polyester film or polyimide film material, and the integral forming method can be bending or stamping integral forming.

[0043] like Figure 1 As shown, in any of the above embodiments of this application, the single cell 100 further includes an adhesive layer 160, which is disposed on the side of the first support portion 1411 near the first bending portion 1322 and is bonded to the first bending portion 1322.

[0044] In this embodiment, an adhesive layer 160 is provided on the side of the first support portion 1411 near the first bending portion 1322, which is bonded to the first bending portion 1322. Under the bonding action of the adhesive layer 160, the first support portion 1411 and the first bending portion 1322 are kept in contact, thereby preventing the first bending portion 1322 from detaching from the first support portion 1411 in a direction away from the first support portion 1411, which would cause the internal short circuit of the inserted electrode body 131 and further ensure the safety performance of the single cell 100.

[0045] For example, the adhesive layer 160 may be double-sided tape or formed by curing adhesive.

[0046] Embodiments of this application also provide a battery pack, including the single battery cell 100 in any of the above embodiments.

[0047] The battery pack has the single cell 100 of any of the above embodiments, and therefore has all the beneficial effects of the single cell 100, which will not be described in detail here.

[0048] The battery pack has a housing and at least one individual battery cell 100 as described in any of the above embodiments, the individual battery cell 100 being disposed within the housing. When there are multiple individual batteries cell 100, the multiple individual batteries cell 100 can be connected in series or in parallel, or in a combination of series and parallel connections.

[0049] 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.

[0050] 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 single-cell battery, characterized in that, The single cell (100) has a first orientation (X), including: Casing (110); A top cover (120) is connected to the housing (110), and a pole post (121) is provided on the top cover (120). A first electrode assembly (130) is disposed within the housing (110). The first electrode assembly (130) includes a connected electrode body (131) and a tab (132). The tab (132) is located at one end of the electrode body (131) near the top cover (120). The tab (132) includes a first bend (1322). An insulating layer (140) is disposed inside the housing (110). The insulating layer (140) includes an insulating body (142) and a first support portion (1411) connected together. The insulating body (142) is wrapped around the electrode body (131). The first support portion (1411) is connected to one end of the insulating body (142) near the top cover (120). The first bending portion (1322) passes through the insulating layer (140). The first bending portion (1322) passing through the insulating layer (140) is located on the side of the first support portion (1411) away from the electrode body (131) along the first direction (X). The first bending portion (1322) is electrically connected to the pole post (121).

2. The single-cell battery according to claim 1, characterized in that, The insulating body (142) includes a top insulating portion (1421), which is located at one end of the electrode body (131) near the top cover (120). The first support portion (1411) is connected to the side of the top insulating portion (1421) away from the electrode body (131). The first bent portion (1322) passes through the top insulating portion (1421) and is electrically connected to the pole post (121).

3. The single-cell battery according to claim 2, characterized in that, The single cell (100) further includes a second electrode assembly (150), which is arranged with the first electrode assembly (130) along the first direction (X). The insulating layer (140) further includes a second support portion (1412), which is arranged opposite to the first support portion (1411) along the first direction (X). The second electrode assembly (150) further includes a second bending portion (151), which is arranged opposite to the first bending portion (1322) along the first direction (X). The second bending portion (151) passes through the insulating layer (140). The second bending portion (151) passing through the insulating layer (140) is located on the side of the second support portion (1412) away from the electrode body (131) along the first direction (X). The second bending portion (151) is electrically connected to the terminal post (121).

4. The single-cell battery according to claim 3, characterized in that, The single cell (100) has a center line (P), the first support (1411) bends away from the center line (P), and the second support (1412) bends away from the center line (P).

5. The single-cell battery according to claim 2, characterized in that, The insulating body (142) further includes an abutment portion (1422) connected to the top surface insulating portion (1421). The abutment portion (1422) is located at the end of the top surface insulating portion (1421) away from the first support portion (1411) and protrudes in a direction away from the first support portion (1411), abutting against the end of the electrode body (131) near the top cover (120).

6. The single-cell battery according to claim 2, characterized in that, The single cell (100) has a second direction (Z), and the top insulating part (1421) is provided with a through hole (14211) that runs through the second direction (Z). The first bent part (1322) passes through the through hole (14211) and is electrically connected to the terminal (121).

7. The single-cell battery according to claim 2, characterized in that, The single cell (100) has a second direction (Z), and the insulating body (142) further includes a side insulating portion (1423) and a bottom insulating portion (1424). The side insulating portion (1423) is disposed in the circumferential direction of the electrode body (131), and the two ends of the side insulating portion (1423) along the second direction (Z) are connected to the top insulating portion (1421) and the bottom insulating portion (1424).

8. The single-cell battery according to any one of claims 1 to 7, characterized in that, The single cell (100) further includes an adhesive layer (160), which is disposed on the side of the first support portion (1411) near the first bending portion (1322) and is bonded to the first bending portion (1322).

9. The single-cell battery according to any one of claims 1 to 7, characterized in that, The first support part (1411) and the insulating body (142) are integrally formed.

10. A battery pack, characterized in that, Includes the single cell (100) according to any one of claims 1 to 9.

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