Battery cell shell, battery cell and battery pack

Abstract

The utility model provides a battery cell shell, a battery cell and a battery pack. The battery cell shell comprises a shell main body with two open ends and two insulating parts arranged in the shell main body, and the two insulating parts are arranged at a first electrode end and a second electrode end of the shell main body; each insulating part extends in the circumferential direction of the shell main body, and in the length direction of the shell main body, the insulating part located at the first electrode end at least covers the abutting area between the first insulating part in the battery cell and the corresponding end plate, and / or the insulating part located at the second electrode end covers the abutting area between the first insulating part in the battery cell and the corresponding end plate. And the insulating part positioned at the second electrode end at least covers a connecting area between the second insulating piece and the corresponding insulating sheet in the battery cell. According to the battery cell shell disclosed by the utility model, the risk of short circuit caused by lap joint of the tabs and the shell main body can be reduced in a manner of carrying out insulation protection on the local area of the inner wall of the shell main body, so that the safety of the battery cell can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery cell shell. At the same time, the utility model also relates to a battery cell provided with the battery cell shell, and a battery pack provided with the battery cell. Background Art

[0002] At present, the main structure of the blade cell includes a cover plate (integrated with poles, explosion-proof valves, upper plastic, lower plastic and injection holes), a shell, a pole group end plate, a side plate, a bare cell insulating sheet and a pole group, etc. Among them, after the cover plate and the shell are welded, a closed space with a certain mechanical strength is formed to protect the pole group. After the side plate and the bare cell insulating sheet are welded and fixed, they are wrapped around the outside of the pole group. At the same time, the bare cell insulating sheet and the plastic parts of the positive and negative pole cover plates are melted and fixed, so that the pole group is well fixed in the shell to avoid short circuit of the pole group.

[0003] However, in the existing blade cells, after the positive electrode cover plate is installed in the shell, the position of the positive electrode end plate is easily pressed off-center by the positive electrode cover plate, causing misalignment between the positive electrode end plate and the plastic under the positive electrode cover plate, resulting in the positive electrode tab overlapping the shell through the misaligned gap between the positive electrode end plate and the positive electrode cover plate, causing a short circuit inside the cell. At the same time, the existing blade cells also have the problem of loose hot-melt between the bare cell insulating sheet at the negative end and the plastic under the negative electrode, causing the negative electrode tab to overlap the shell through the gap between the bare cell insulating sheet and the plastic under the negative electrode, thereby causing a short circuit inside the cell. Utility Model Content

[0004] In view of this, the utility model aims to provide a battery cell housing to avoid internal short circuit of the battery cell and improve the safety of the battery cell.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery cell shell comprises a shell body with two open ends, and two insulating parts arranged in the shell body, wherein the two insulating parts are arranged at a first electrode end and a second electrode end of the shell body;

[0007] The insulating portion located at the first electrode end at least covers the abutment area between the first insulating member in the battery cell and the corresponding end plate, and / or the insulating portion located at the second electrode end at least covers the connection area between the second insulating member in the battery cell and the corresponding insulating sheet.

[0008] Furthermore, along the length direction of the shell body, the width dimension of each insulating part is between 5-40 mm.

[0009] Furthermore, the thickness of each insulating portion is between 0.01-0.3 mm.

[0010] Furthermore, the spacing between the insulating portion at the first electrode end and the first electrode end surface of the shell body is between 1-5 mm; and / or the spacing between the insulating portion at the second electrode end and the second electrode end surface of the shell body is between 1-5 mm.

[0011] Furthermore, the insulating portion is made of an insulating coating, or the insulating portion is made of an insulating tape.

[0012] Furthermore, the shell body is formed by integrally bending a steel plate, or the shell body is formed by integrally roll-pressing a steel plate.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The battery cell shell described in the utility model can provide insulation protection in a local area of ​​the inner wall of the shell body by arranging two insulating parts in the shell body, so that when a misaligned gap is formed between the first insulating member and the corresponding end plate, the insulating part located at the first electrode end can prevent the end electrode ear from passing through the misaligned gap and overlapping the shell body, and when a connection gap is formed between the second insulating member and the corresponding insulating sheet, the insulating part located at the second electrode end can prevent the end electrode ear from passing through the connection gap and overlapping the shell body, thereby reducing the risk of short circuit caused by the overlap of each electrode ear and the shell body and improving the safety of the battery cell.

[0015] Secondly, along the length direction of the shell body, the width of each insulating part is between 5-40mm, which can effectively cover the abutment area between the first insulating part and the corresponding end plate, and the connection area between the second insulating part and the corresponding insulating sheet, reduce the possibility of overlap between the tab and the shell body, and ensure insulation reliability. The thickness of each insulating part is between 0.01-0.3mm, which is conducive to ensuring the insulation reliability of the insulating part itself.

[0016] Furthermore, the spacing between the insulating portion at the first electrode end and the first electrode end surface of the shell body is between 1-5 mm, and the spacing between the insulating portion at the second electrode end and the second electrode end surface of the shell body is between 1-5 mm, which can avoid the assembly and matching parts between the cover plate of the first electrode end and the shell body and between the cover plate of the second electrode end and the shell body, which not only avoids affecting the assembly of the cover plate, but also reduces the material used in the insulating portion, thereby achieving a cost-saving design.

[0017] In addition, the utility model also provides a battery cell, comprising the battery cell shell as described above.

[0018] In addition, the utility model also provides a battery pack, in which the above-mentioned battery cell is arranged.

[0019] The battery cell, battery pack and the battery cell shell described in the utility model have the same beneficial effects as those of the conventional technology, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the internal structure of the positive electrode portion of the battery cell according to an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the negative electrode portion of the battery cell according to an embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the internal structure of the battery cell housing according to an embodiment of the utility model;

[0024] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0025] Description of reference numerals:

[0026] 10, pole group; 100, pole ear;

[0027] 11. Shell body; 111. Positive terminal; 112. Negative terminal; 113. Insulating part;

[0028] 12. Positive terminal plate; 13. Positive side insulating member; 14. Negative side insulating sheet; 15. Negative side insulating member;

[0029] Y, the width of the insulating part; t, the distance between the insulating part and the end face of the shell body. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0034] Embodiment 1

[0035] The present embodiment relates to a battery cell shell, which can reduce the risk of short circuit caused by the overlap of the tab 100 and the shell body 11 by providing insulation protection in a local area of ​​the inner wall of the shell body 11, thereby making the battery cell safer.

[0036] In terms of overall structure, Figures 1 to 4 As shown, the cell shell of this embodiment includes a shell body 11 with two open ends, and two insulating parts 113 arranged in the shell body 11, and the two insulating parts 113 are respectively arranged at the first electrode end and the second electrode end of the shell body 11.

[0037] Among them, each insulating part 113 is arranged to extend along the circumference of the shell body 11, and along the length direction of the shell body 11, the insulating part 113 located at the first electrode end at least covers the abutment area between the first insulating part in the battery cell and the corresponding end plate, and at the same time, the insulating part 113 located at the second electrode end at least covers the connection area between the second insulating part in the battery cell and the corresponding insulating sheet.

[0038] It is worth mentioning that the battery cell shell in this embodiment is not only applicable to the above-mentioned situation where the two end structures are designed differently, that is, the insulating portion 113 located at the first electrode end at least covers the abutment area between the first insulating component in the battery cell and the corresponding end plate, and at the same time, the insulating portion 113 located at the second electrode end at least covers the connection area between the second insulating component in the battery cell and the corresponding insulating sheet 1, but is also applicable to the situation where the first electrode end and the second electrode end of the battery cell shell have opposite and identical structural designs.

[0039] Specifically, when the structural designs of the first electrode end and the second electrode end of the battery cell shell are opposite, the insulating portion 113 located at the first electrode end at least covers the connection area between the first insulating member in the battery cell and the corresponding insulating sheet, and at the same time, the insulating portion 113 located at the second electrode end at least covers the abutment area between the second insulating member in the battery cell and the corresponding end plate.

[0040] When the first electrode end and the second electrode end of the cell shell have the same structural design, the insulating portion 113 at the first electrode end at least covers the abutment area between the first insulating member in the cell and the corresponding end plate, and the insulating portion 113 at the second electrode end also at least covers the abutment area between the second insulating member in the cell and the corresponding end plate. Alternatively, the insulating portion 113 at the first electrode end at least covers the connection area between the first insulating member in the cell and the corresponding insulating sheet, and the insulating portion 113 at the second electrode end at least covers the connection area between the second insulating member in the cell and the corresponding insulating sheet.

[0041] The electrode end in this embodiment refers to the positive electrode end 111 or the negative electrode end 112, and when the first electrode end is the positive electrode end 111 and the second electrode end is the negative electrode end 112, it means that in this embodiment, the positive electrode end 111 of the shell body 11 corresponds to a positive terminal plate 12 (that is, the above-mentioned end plate). At this time, the first insulating member is the positive electrode side insulating member 13, and the second insulating member is the negative electrode side insulating member 15.

[0042] At the same time, when the first electrode end is the negative electrode end 112 and the second electrode end is the positive electrode end 111, it means that this embodiment is an example in which the negative terminal 112 of the shell body 11 is provided with a negative terminal plate (that is, the above-mentioned end plate). At this time, the first insulating member is the negative electrode side insulating member 15, and the second insulating member is the positive electrode side insulating member 13.

[0043] In addition, in this embodiment, there is also a situation where the positive terminal 111 of the shell body 11 is correspondingly provided with a positive terminal plate 12, and the negative terminal 112 is correspondingly provided with a negative terminal plate, and there is also a situation where the positive terminal 111 of the shell body is correspondingly provided with a positive side insulating sheet, and the negative terminal 112 is correspondingly provided with a negative insulating sheet 14.

[0044] Regardless of whether the above-mentioned end plate is the positive terminal plate 12 or the negative terminal plate, or whether the insulating sheet is the positive side insulating sheet or the negative side insulating sheet 14, the structures of the example cases are basically similar except that the electrodes are opposite. For this reason, this embodiment is specifically described below using "the above-mentioned end plate is the positive terminal plate 12, the first electrode terminal is the positive terminal 111, and the insulating sheet is the negative side insulating sheet 14, and the second electrode terminal is the negative terminal 112" as an example.

[0045] That is, the two insulating parts 113 of this embodiment are respectively arranged at the positive terminal 111 and the negative terminal 112 of the shell body 11. Among them, each insulating part 113 is arranged to extend along the circumferential direction of the shell body 11, and along the length direction of the shell body 11, the insulating part 113 located at the positive terminal 111 at least covers the abutment area between the positive side insulating part 13 and the positive terminal plate 12 in the battery cell, and the insulating part 113 located at the negative terminal 112 at least covers the connection area between the negative side insulating part 15 and the negative side insulating sheet 14 in the battery cell.

[0046] Furthermore, the battery cell shell and various structures not mentioned in the battery cell of the present embodiment may refer to the relevant structural parts in the blade battery cell commonly used in the prior art. For example, the battery cell includes a pole group 10, and pole ears 100 (positive pole ear and negative pole ear) arranged at both ends of the pole group 10. The positive terminal 111 of the shell body 11 is correspondingly provided with a positive pole cover plate, and the positive pole side insulating member 13 is arranged on the side of the positive pole cover plate facing the interior of the shell body 11. The negative terminal 112 of the shell body 11 is correspondingly provided with a negative pole cover plate, and the negative pole side insulating member 15 is arranged on the side of the negative pole cover plate facing the interior of the shell body 11.

[0047] At the same time, the negative side insulating member 15 is the lower plastic well known to those skilled in the art, the negative side insulating sheet 14 is hot-melt connected with the negative side insulating member 15, and the positive end plate 12 is specifically abutted against the positive side insulating member 13.

[0048] Specifically, in this embodiment, as an exemplary structure, Figure 3 and Figure 4 As shown, along the length direction of the shell body 11, the width dimension Y of each insulating portion 113 is between 5-40 mm. In a specific structure, the width dimension Y of each insulating portion 113 can be 5 mm, 20 mm, 30 mm or 40 mm.

[0049] The advantage of this arrangement is that it can effectively cover the abutment area between the positive terminal plate 12 and the positive side insulating member 13, as well as the connection area between the negative side insulating sheet 14 and the negative side insulating member 15, thereby reducing the possibility of overlap between the positive and negative pole tabs and the shell body 11, and ensuring insulation reliability.

[0050] Furthermore, as a preferred implementation form, in this embodiment, the thickness of each insulating portion 113 is between 0.01 mm and 0.3 mm, so as to ensure the insulation reliability of the insulating portion 113 itself.

[0051] Of course, in specific implementation, the thickness of each insulating portion 113 can be set and adjusted according to actual insulation requirements, for example, it can be set to 0.01 mm, 0.1 mm or 0.3 mm, etc., so as to obtain a relatively optimal insulation effect.

[0052] In addition, in this embodiment, as a preferred implementation form, Figure 4 As shown, the distance t between the insulating portion 113 at the positive terminal 111 and the positive terminal surface of the shell body 11 is between 1-5 mm, and at the same time, the distance between the insulating portion 113 at the negative terminal 112 and the negative terminal surface of the shell body 11 is between 1-5 mm.

[0053] In this way, the assembly matching parts between the positive electrode cover plate and the shell body 11 and between the negative electrode cover plate and the shell body 11 can be avoided, which not only avoids affecting the assembly of the positive electrode cover plate and the negative electrode cover plate, but also reduces the material used in the insulating part 113, thereby achieving cost-saving design.

[0054] It is also worth mentioning that the value of the spacing t in the present embodiment can be set and adjusted according to the actual size of the positive electrode cover or the negative electrode cover in the battery cell installed in the shell body 11. For example, if the length of the positive electrode cover (positive electrode side insulating member 13) extending into the shell body 11 is 1 mm, then the spacing t between the insulating portion 113 at the positive terminal 111 and the positive terminal surface of the shell body 11 can be specifically 1.5 mm, 3 mm or 5 mm, etc.

[0055] In addition, in this embodiment, as a preferred implementation form, the insulating portion 113 is made of an insulating coating, or the insulating portion 113 is made of an insulating tape, wherein the insulating coating can be made of a material well known to those skilled in the art, such as a polyurethane acrylate material.

[0056] At the same time, considering the production efficiency and molding quality of the shell body 11, in this embodiment, as a preferred implementation form, the shell body 11 is formed by integral bending of a steel plate, or the shell body 11 is formed by integral roll-pressing of a steel plate. In addition, the shell body 11 after bending or rolling needs to be welded at the side, so that the shell body 11 is an integral structure with a side seal, which is conducive to ensuring the overall sealing of the battery cell.

[0057] The battery cell shell of this embodiment is capable of providing insulation protection in a local area of ​​the inner wall of the shell body 11 by arranging two insulating parts 113 in the shell body 11, so that when a misalignment gap is formed between the positive terminal plate 12 and the positive-side insulating member 13, the insulating part 113 located at the positive terminal 111 can prevent the positive pole ear from passing through the misalignment gap and overlapping the shell body 11, and when a connection gap is formed between the negative-side insulating sheet 14 and the negative-side insulating member 15, the insulating part 113 located at the negative terminal 112 can prevent the negative pole ear from passing through the connection gap and overlapping the shell body 11, thereby reducing the risk of short circuit caused by overlapping of the positive pole ear, the negative pole ear and the shell body 11, thereby improving the safety of the battery cell.

[0058] Embodiment 2

[0059] This embodiment relates to a battery cell, which includes the battery cell housing in Embodiment 1. At the same time, this embodiment also relates to a battery pack, in which the above-mentioned battery cell is arranged.

[0060] The battery cell and battery pack of this embodiment can reduce the risk of internal short circuit of the battery cell by providing the battery cell housing in the first embodiment, thereby improving the safety performance.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell casing, characterized in that: It comprises a shell body with two open ends, and two insulating parts arranged in the shell body, wherein the two insulating parts are arranged at a first electrode end and a second electrode end of the shell body; Each of the insulating parts is arranged to extend along the circumference of the shell body, and along the length direction of the shell body, the insulating part located at the first electrode end at least covers the abutment area between the first insulating part in the battery cell and the corresponding end plate, and / or the insulating part located at the second electrode end at least covers the connection area between the second insulating part in the battery cell and the corresponding insulating sheet.

2. The battery cell casing according to claim 1, characterized in that: Along the length direction of the shell body, the width dimension of each insulating part is between 5-40 mm.

3. The battery cell casing according to claim 1, characterized in that: The thickness of each insulating part is between 0.01-0.3 mm.

4. The battery cell casing according to claim 1, characterized in that: The distance between the insulating portion at the first electrode terminal and the first electrode terminal surface of the shell body is between 1-5 mm; and / or, The distance between the insulating portion at the second electrode terminal and the second electrode end surface of the shell body is between 1-5 mm.

5. The battery cell casing according to claim 1, characterized in that: The insulating portion is made of an insulating coating, or the insulating portion is made of an insulating tape.

6. The battery cell casing according to any one of claims 1 to 5, characterized in that: The shell body is formed by integrally bending a steel plate, or the shell body is formed by integrally rolling a steel plate.

7. A battery cell, characterized in that: A battery cell casing comprising the battery cell casing according to any one of claims 1 to 6.

8. A battery pack, characterized in that: The battery pack is provided with the battery cell described in claim 7.

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