Battery cell and battery device

Abstract

The application discloses a battery monomer and a battery device, and relates to the technical field of batteries, wherein the battery monomer comprises a shell, a first cover plate, a second cover plate and an insulating film; the first cover plate and the second cover plate are arranged at opposite ends of the shell respectively; the insulating film is sleeved on the shell, and the edge of the insulating film is attached to the first cover plate or the second cover plate. The battery monomer provided by the application can reduce the risk of condensate water seeping into the shell.

Description

[0001] Cross-reference to related applications

[0002] This utility model claims priority to Chinese Patent Application No. 202520175915X, entitled “Battery Cell and Battery Device”, filed on January 24, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a battery cell and a battery device. Background Technology

[0004] A battery cell consists of a casing and electrode assemblies housed within the casing. The casing is typically insulated, with external insulation including a top patch and an outer blue film, which protect the top cover and casing, respectively. However, traditional blue films, when covering the sidewalls of the battery cell casing, are usually edged at the corresponding sidewall, which can easily leave a gap. In the presence of condensation or water vapor, water can capillarily seep in through this gap, causing a short circuit between the casing and the electrode assemblies due to water contact, posing a risk of electrical leakage. Utility Model Content

[0005] The main objective of this application is to provide a battery cell and battery device that are designed to reduce the risk of condensate entering the housing.

[0006] To achieve the above objectives, the battery cell proposed in this application includes a housing, a first cover plate, a second cover plate, and an insulating film; the first cover plate and the second cover plate are respectively disposed at opposite ends of the housing; the insulating film is sleeved on the housing, and the edge of the insulating film is attached to the first cover plate or the second cover plate.

[0007] In one embodiment, the second cover plate and the housing are integrally formed, and the housing has an opening at one end away from the second cover plate, with the first cover plate covering the opening.

[0008] In one embodiment, the insulating film completely covers the first cover plate, and the edge of the insulating film is attached to the second cover plate.

[0009] In one embodiment, the battery cell further includes an insulating patch disposed on the first cover plate.

[0010] In one embodiment, the insulating film completely covers the second cover plate, and the edge of the insulating film is attached to the first cover plate.

[0011] In one embodiment, the battery cell further includes an insulating patch, which is disposed on the first cover plate and integrally formed with the edge of the insulating film.

[0012] In one embodiment, the insulating film includes a first insulating film and a second insulating film, which are stacked and sleeved on the outside of the housing, with the edge of the first insulating film attached to the first cover plate and the edge of the second insulating film attached to the second cover plate.

[0013] In one embodiment, the first cover plate and the housing are separately disposed, and the first insulating film is sleeved over the second insulating film.

[0014] In one embodiment, an adhesive layer is formed at the edge of the insulating film, and the adhesive layer is bonded to the first cover plate or the second cover plate.

[0015] This application also proposes a battery device comprising the aforementioned battery cell.

[0016] The technical solution of this application, by placing the first cover plate and the second cover plate at opposite ends of the housing, forms a closed cavity together with the housing, the first cover plate, and the second cover plate, thus providing good protection for the components inside the housing. By covering the housing with an insulating film, and having the edge of the insulating film adhere to the first or second cover plate, the risk of gaps between the insulating film and the housing is reduced. This reduces the possibility of condensate seeping into the housing through these gaps, thereby lowering the risk of short circuits caused by condensate contact between the housing and the components inside. It also reduces the risk of foreign objects or dust entering the battery cells and causing breakdown. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 An exploded structural diagram of an embodiment of the housing and electrode assembly in a battery cell provided in this application;

[0019] Figure 2 An exploded structural diagram of a battery cell containing the casing and insulating film according to an embodiment of this application;

[0020] Figure 3An exploded structural diagram of another embodiment of the casing and insulating film in the battery cell provided in this application;

[0021] Figure 4 An exploded structural diagram of another embodiment of the casing and insulating film in the battery cell provided in this application;

[0022] Figure 5 An exploded structural diagram of another embodiment of the casing and insulating film in the battery cell provided in this application;

[0023] Figure 6 This is an exploded structural diagram of an embodiment of the battery device provided in this application.

[0024] Explanation of icon numbers:

[0025] 100. Battery cell;

[0026] 110. Shell;

[0027] 120. First cover plate; 121. Pole post;

[0028] 130. Second cover plate;

[0029] 140. Electrode assembly;

[0030] 150. Insulating film; 151. First insulating film; 152. Second insulating film;

[0031] 160. Insulating patch;

[0032] 200. Box body.

[0033] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0037] The external insulation protection of a battery cell includes a top patch and an outer blue film, which protect the top cover and the casing, respectively. However, traditional blue films typically use a layered structure to cover the sidewalls of the battery cell. When covering the sidewalls of the battery cell, the film is usually finished at the corresponding edge, which can easily leave a gap. In environments with condensation and water mist, water can seep in capillarily along the gap, causing a short circuit between the casing and the battery cell due to water contact, posing a risk of leakage.

[0038] To reduce the risk of leakage, this application proposes a single battery cell.

[0039] Please refer to the reference. Figures 1 to 5 In one embodiment of this application, the battery cell 100 includes a housing 110, a first cover plate 120, a second cover plate 130, and an insulating film 150; the first cover plate 120 and the second cover plate 130 are respectively disposed at opposite ends of the housing 110; the insulating film 150 is sleeved on the housing 110, and the edge of the insulating film 150 is attached to the first cover plate 120 or the second cover plate 130.

[0040] The housing 110 is typically made of metal and can be a cuboid or cylindrical structure. The housing 110 has two opposite ends, with a first cover plate 120 and a second cover plate 130 respectively located at these opposite ends. These three plates together form a closed cavity, providing good protection for the components housed within the housing 110. Specifically, the first cover plate 120 can be circular, rectangular, or other shapes, and the second cover plate 130 can also be circular, rectangular, or other shapes. It is understood that when the housing 110 is cylindrical, both the first cover plate 120 and the second cover plate 130 are circular. When the housing 110 is cuboid, both the first cover plate 120 and the second cover plate 130 are rectangular. The first cover plate 120 can be integral with the housing 110 or a separate structure, and the second cover plate 130 can also be integral with the housing 110 or a separate structure.

[0041] The cavity formed by the housing 110, the first cover plate 120, and the second cover plate 130 can accommodate the electrode assembly 140. The electrode assembly 140 may include a positive electrode, a negative electrode, a separator disposed between the positive and negative electrodes, and an electrolyte impregnating the positive and negative electrodes, etc. It is understood that the housing 110 is typically made of metal. To reduce the risk of short circuits caused by contact between the positive and negative electrodes and the housing 110, the electrode assembly 140 may also include an insulating sleeve that wraps around the positive and negative electrodes to isolate them from the housing 110. The electrode assembly 140 also includes tabs, with at least two tabs connected to the positive and negative electrodes respectively. In one example, the first cover plate 120 of the housing 110 has two posts 121, which are electrically connected to two tabs respectively. In another example, a pole post 121 is provided on both the first cover plate 120 and the second cover plate 130 of the housing 110, and the two pole posts 121 are electrically connected to two tabs respectively. It can be understood that when the insulating film 150 covers the first cover plate 120 and the first cover plate 120 is provided with the pole post 121, the insulating film 150 can be provided with a clearance hole to avoid the pole post 121 at the position corresponding to the position of the pole post 121 on the first cover plate 120; when the insulating film 150 covers the second cover plate 130 and the second cover plate 130 is provided with the pole post 121, the insulating film 150 can be provided with a clearance hole to avoid the pole post 121 at the position corresponding to the position of the pole post 121 on the second cover plate 130.

[0042] Taking the rectangular shell 110 as an example, the shell 110 includes a first plate, a second plate, a third plate, and a fourth plate connected end to end. The first plate, the second plate, the third plate, and the fourth plate together enclose a hollow rectangular cylindrical structure. That is, the opposite ends of the shell 110 form a first opening and a second opening, respectively. The first cover plate 120 and the second cover plate 130 cover the first opening and the second opening, respectively. When the insulating film 150 is applied to the shell 110, it means that the insulating film 150 completely covers the first plate, the second plate, the third plate, and the fourth plate of the shell 110. In order to achieve the effect that the insulating film 150 completely covers the shell 110, the single-layer insulating film 150 is an integral structure, and the insulating film 150 can be rectangular, circular, or other shapes. For example, when the insulating film 150 is a rectangular film, it can wrap around the housing 110 from the first opening to the second opening. That is, the insulating film 150 can be placed on the side of the first cover plate 120 away from the second cover plate 130, and then completely wrap around the first cover plate 120 and the housing 110 in sequence, finally attaching the edge of the insulating film 150 to the second cover plate 130. Alternatively, the insulating film 150 can also wrap around the housing 110 from the second opening to the first opening. That is, the insulating film 150 can be placed on the side of the second cover plate 130 away from the first cover plate 120, and then completely wrap around the second cover plate 130 and the housing 110 in sequence, finally attaching the edge of the insulating film 150 to the first cover plate 120. With this configuration, it can be understood that when the insulating film 150 wraps around the housing 110 from the first opening to the second opening or from the second opening to the first opening, since the edges of the insulating film 150 are all tucked into the first cover plate 120 or the second cover plate 130, the risk of forming a tucked-in gap at the corresponding position of the housing 110 can be reduced, thereby reducing the risk of seeping into the housing 110 from the tucked-in gap.

[0043] Of course, in other examples, the single-layer insulating film 150 that does not wrap the housing 110 may also have an opening in the middle, so that the single-layer insulating film 150 forms a ring structure. In this case, the insulating film 150 still wraps the housing 110 from the first opening to the second opening, or it can wrap the housing 110 from the second opening to the first opening. Taking the example of the insulating film 150 wrapping the housing 110 from the second opening to the first opening, specifically, the insulating film 150 can be provided on the side of the second cover plate 130 away from the first cover plate 120, and the opening in the middle of the insulating film 150 corresponds to a part of the second cover plate 130, or the projected area of ​​the opening is equal to the plate surface area of ​​the second cover plate 130. Then, the insulating film 150 wraps the housing 110 towards the first cover plate 120, and the outer edge of the insulating film 150 is completely folded and attached to the first cover plate 120. Understandably, at this point, the insulating film 150 completely covers the housing 110 and part of the first cover plate 120. Additionally, the insulating film 150 may cover part of the second cover plate 130 or not cover it at all. In this example, the insulating film 150 does not form a sealing gap at the location corresponding to the housing 110, thus reducing the risk of condensate seeping into the housing 110 through the sealing gap.

[0044] The technical solution of this application, by placing the first cover plate 120 and the second cover plate 130 at opposite ends of the housing 110, forms a closed cavity together with the housing 110, the first cover plate 120, and the second cover plate 130, thus providing good protection for the components inside the housing 110. By covering the housing 110 with an insulating film 150, and with the edge of the insulating film 150 affixed to the first cover plate 120 or the second cover plate 130, the risk of gaps between the insulating film 150 and the corresponding position of the housing 110 is reduced. This reduces the possibility of condensate entering the housing 110 through capillary penetration along these gaps, thereby lowering the risk of short circuits caused by condensate contact between the housing 110 and the components inside the housing 110. It also reduces the risk of foreign objects or dust entering the battery cell 100 and causing breakdown.

[0045] In some embodiments of this application, the second cover plate 130 and the housing 110 are integrally formed, and the end of the housing 110 away from the second cover plate 130 is provided with an opening, and the first cover plate 120 covers the opening.

[0046] Specifically, the second cover plate 130 and the housing 110 can be integrally formed, for example by stamping, or the second cover plate 130 and the housing 110 can be integrally formed by welding.

[0047] This design ensures that the second cover plate 130 and the housing 110 are not removable, and guarantees a good seal between them, reducing the risk of condensate seeping into the housing 110 from the connection between the second cover plate 130 and the housing 110. Furthermore, this design allows the housing 110 and the second cover plate 130 to form an open-end structure, facilitating the insertion of the electrode assembly 140 or similar components into the cavity formed by the housing 110 and the second cover plate 130. The first cover plate 120 then closes the opening, providing excellent protection for the electrode assembly 140.

[0048] like Figure 2 As shown, the insulating film 150 further completely covers the first cover plate 120, and the edge of the insulating film 150 is attached to the second cover plate 130.

[0049] By completely wrapping the first cover plate 120 with the insulating film 150 and attaching its edge to the second cover plate 130, the insulating film 150 effectively wraps the entire first cover plate 120 and the connection between the first cover plate 120 and the housing 110, thereby reducing the risk of condensate seeping into the housing 110 from the connection between the first cover plate 120 and the housing 110. Furthermore, by attaching the edge of the insulating film 150 to the second cover plate 130, the insulating film 150 also wraps the connection between the second cover plate 130 and the housing 110, further reducing the risk of condensate seeping into the housing 110 from the connection between the second cover plate 130 and the housing 110.

[0050] Please refer to the reference. Figure 2 and Figure 3 Furthermore, based on the scheme of the first cover plate 120 covering the opening and the insulating film 150 completely covering the first cover plate 120, the battery cell 100 also includes an insulating patch 160, which is disposed on the first cover plate 120.

[0051] By placing the insulating patch 160 on the first cover plate 120, the first cover plate 120 can be provided with dual insulation protection through the insulating patch 160 and the insulating film 150, thereby improving the external insulation effect of the battery cell 100.

[0052] It is understandable that when the first cover plate 120 is provided with the pole post 121, the insulating patch 160 and the insulating film 150 are respectively provided with a clearance opening and a clearance hole to avoid the pole post 121, and the pole post 121 passes through the clearance opening on the insulating patch 160 and the clearance hole on the insulating film 150.

[0053] like Figure 4 As shown, in some embodiments of this application, the insulating film 150 completely covers the second cover plate 130, and the edge of the insulating film 150 is attached to the first cover plate 120.

[0054] By completely wrapping the second cover plate 130 with the insulating film 150 and attaching the edge of the insulating film 150 to the first cover plate 120, the insulating film 150 can provide insulation protection for the second cover plate 130. Furthermore, this arrangement also ensures that the insulating film 150 wraps the connection between the second cover plate 130 and the housing 110, thereby reducing the risk of condensate seeping into the housing 110 from the connection between the second cover plate 130 and the housing 110.

[0055] like Figure 4 As shown, in some embodiments of this application, the battery cell 100 further includes an insulating patch 160, which is disposed on the first cover plate 120 and has an integral structure with the edge of the insulating film 150.

[0056] Specifically, the edges of the insulating film 150 can be sealed together with the insulating patch 160 and form an integrated structure by means of hot melting, dispensing, etc.

[0057] By placing the insulating patch 160 on the first cover plate 120, the insulating patch 160 can provide good insulation protection for the first cover plate 120. By making the insulating patch 160 and the edge of the insulating film 150 an integral structure, a good sealing effect is achieved between the insulating film 150 and the insulating patch 160, thereby reducing the risk of condensate seeping into the housing 110 through the connection between the insulating film 150 and the insulating patch 160.

[0058] like Figure 5 As shown, in one embodiment of this application, the insulating film 150 includes a first insulating film 151 and a second insulating film 152. The first insulating film 151 and the second insulating film 152 are stacked and sleeved on the outside of the housing 110, and the edge of the first insulating film 151 is attached to the first cover plate 120, and the edge of the second insulating film 152 is attached to the second cover plate 130.

[0059] This configuration provides the insulating film 150 with dual insulation protection for the housing 110. It also enables the insulating film 150 to effectively insulate and seal the connection between the first cover plate 120 and the housing 110, as well as the connection between the second cover plate 130 and the housing 110. This further reduces the risk of condensate entering the housing 110, thereby reducing the risk of the housing 110 short-circuiting with the electrode assembly 140 located inside the housing 110 through condensate.

[0060] like Figure 5 As shown, the first cover plate 120 and the housing 110 are further separated, and the first insulating film 151 is sleeved on the outside of the second insulating film 152.

[0061] The first cover plate 120 and the housing 110 are separate components, meaning they are manufactured as two independent parts. When the first cover plate 120 is connected to the housing 110, a gap may still exist between them. By covering the second insulating film 152 with the first insulating film 151, both the second insulating film 152 and the first insulating film 151 can completely cover the gap between the first cover plate 120 and the housing 110. Furthermore, this arrangement allows external condensate to flow through the gap between the first cover plate 120 and the housing 110. First, it moves from the first cover plate 120 to the second cover plate 130 via the gap between the first insulating film 151 and the second insulating film 152. Then, it moves from the second cover plate 130 to the first cover plate 120 via the gap between the second insulating film 152 and the housing 110, eventually reaching the connection between the first cover plate 120 and the housing 110. This longer flow path reduces the risk of condensate seeping into the connection between the first cover plate 120 and the housing 110, improving the sealing effect between them.

[0062] In one embodiment of this application, an adhesive layer is formed at the edge of the insulating film 150, and the adhesive layer is bonded to the first cover plate 120 or the second cover plate 130.

[0063] When an adhesive layer is formed at the edge of the insulating film 150, the user can heat the edge of the insulating film 150 to melt it. This molten edge has adhesive properties and forms an adhesive layer, thereby pressing the molten edge onto the first cover plate 120 or the second cover plate 130, achieving the effect of the adhesive layer formed at the edge of the insulating film 150 being bonded to the first cover plate 120 or the second cover plate 130. Alternatively, the user can apply glue to the edge of the insulating film 150, which forms an adhesive layer, and then bond it to the first cover plate 120 or the second cover plate 130 using the glue.

[0064] This configuration improves the connection stability and sealing performance between the insulating film 150 and the first cover plate 120 or the second cover plate 130, and reduces the risk of condensate seeping into the housing 110 from the edge of the insulating film 150.

[0065] This application also proposes a battery device, please refer to... Figure 6 As shown, the battery device includes a battery cell 100. The specific structure of the battery cell 100 is as described in the above embodiments. Since this battery device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0066] like Figure 3As shown, the battery device also includes a housing 200, within which a plurality of battery cells 100 are disposed. The housing 200 provides a receiving space for the battery cells 100, and the housing 200 can adopt various structures. In some embodiments, the housing 200 may include a first part and a second part, which overlap each other, and the first part and the second part together define a receiving space for receiving the battery cells 100. The second part may be a hollow structure with one end open, and the first part may be a plate-like structure, with the first part covering the open side of the second part so that the first part and the second part together define the receiving space; the first part and the second part may also be hollow structures with one side open, with the open side of the first part covering the open side of the second part. Of course, the housing 200 can be of various shapes, such as a cylinder, a cuboid, etc.

[0067] When there are multiple battery cells 100, the multiple battery cells 100 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 100 are connected in both series and parallel. The multiple battery cells 100 can be directly connected in series, in parallel, or in a mixed connection, and then the whole composed of these multiple battery cells 100, that is, the battery module, is housed in the housing 200.

[0068] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery cell, characterized in that, include: case; First cover plate; The second cover plate, the first cover plate and the second cover plate are respectively disposed at opposite ends of the housing; as well as An insulating film is fitted onto the housing, and the edge of the insulating film is attached to the first cover plate or the second cover plate.

2. The battery cell as described in claim 1, characterized in that, The second cover plate is integral with the housing, and the housing has an opening at one end away from the second cover plate, which is covered by the first cover plate.

3. The battery cell as described in claim 2, characterized in that, The insulating film completely covers the first cover plate, and the edge of the insulating film is attached to the second cover plate.

4. The battery cell as described in claim 3, characterized in that, The battery cell also includes an insulating patch, which is disposed on the first cover plate.

5. The battery cell as described in claim 1, characterized in that, The insulating film completely covers the second cover plate, and the edge of the insulating film is attached to the first cover plate.

6. The battery cell as described in claim 3, characterized in that, The battery cell also includes an insulating patch, which is disposed on the first cover plate and is integrally formed with the edge of the insulating film.

7. The battery cell as described in claim 1, characterized in that, The insulating film includes a first insulating film and a second insulating film, which are stacked and sleeved on the outside of the housing. The edge of the first insulating film is attached to the first cover plate, and the edge of the second insulating film is attached to the second cover plate.

8. The battery cell as described in claim 7, characterized in that, The first cover plate and the housing are separate, and the first insulating film is sleeved over the second insulating film.

9. The battery cell according to any one of claims 1 to 8, characterized in that, An adhesive layer is formed at the edge of the insulating film, and the adhesive layer is bonded to the first cover plate or the second cover plate.

10. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.

Images