Lithium-ion batteries and electronic devices

Abstract

The utility model discloses a lithium-ion battery, which includes: a shell; a battery cell, which is arranged in the shell; a metal strip pole ear, which passes through a side wall of the shell and is electrically connected to the battery cell; an abutment member, which is located between the battery cell and a side wall of the shell, one end of the abutment member abuts against the battery cell, and the other end abuts against the side wall, and is used to prevent the battery cell from approaching the metal strip pole ear. The utility model also discloses an electronic device using the above lithium-ion battery. Compared with the related art, the beneficial effect of the technical solution of the utility model is that when the lithium-ion battery is subjected to a drop or roller test, even if the battery cell generates inertia to move toward the metal strip pole ear under external impact, the battery cell cannot approach the metal strip pole ear because an abutment member is provided between the side wall connected to the metal strip pole ear and the battery cell, thereby avoiding the problem of the metal strip pole ear being inserted inversely into the battery cell. In this way, the utility model improves the anti-fall performance of the lithium-ion battery.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a lithium ion battery and an electronic device using the lithium ion battery. Background Art

[0002] As the charging rate requirements of electronic devices increase, more and more wound multi-electrode batteries and laminated batteries are being used. However, due to the process of multi-electrode batteries or laminated batteries, the tabs need to be bent after the foil tabs are drawn out and the metal strip tabs are connected. This requires a certain amount of space to be reserved at the head of the lithium-ion battery cell to accommodate the bent parts of the multi-layer foil tabs and metal strip tabs.

[0003] However, in the related art, after the lithium-ion battery is packaged, the bent parts of the foil tabs and the metal strip tabs cannot fill the above-mentioned space, thereby forming a depression at the head position of the lithium-ion battery cell, thereby affecting the appearance of the lithium-ion battery.

[0004] On the other hand, due to the existence of the above-mentioned space, when the lithium-ion battery is subjected to a drop or roller test, the battery cell is prone to movement, which may cause the metal tab to be inserted inversely into the battery cell. When the metal tab is inserted inversely into the battery cell, it may cause an internal short circuit in the battery cell, thus affecting the safety of the lithium-ion battery. Utility Model Content

[0005] The main purpose of the utility model is to provide a lithium ion battery to solve the problem that the lithium ion battery in the related art is prone to cell movement during a drop or roller test, thereby causing the metal tab to be inserted inverted into the cell.

[0006] To achieve the above-mentioned purpose, one aspect of the utility model proposes a lithium-ion battery, which includes: a shell; a battery cell, which is arranged in the shell; a metal strip pole ear, which passes through a side wall of the shell and is electrically connected to the battery cell; an abutment member, which is located between the battery cell and a side wall of the shell, one end of the abutment member abuts against the battery cell, and the other end abuts against the side wall, so as to prevent the battery cell from approaching the metal strip pole ear.

[0007] In some embodiments, the abutting member includes a first abutting portion abutting against a side wall and a second abutting portion intersecting with the first abutting portion, and the second abutting portion abuts against the battery cell.

[0008] In some embodiments, taking the width c direction of the battery cell as a reference direction, the size difference between the battery cell and the first abutting portion is less than or equal to 0.3 mm.

[0009] In some embodiments, taking the thickness a direction of the battery cell as a reference direction, the size difference between the battery cell and the first abutting portion ranges from 0.1 mm to 0.5 mm.

[0010] In some embodiments, the height of the second abutting portion is 2.8 mm to 3.8 mm.

[0011] In some embodiments, the metal strip tab includes an extension portion located outside the shell and a welding portion located inside the shell, and a plurality of foil tabs are connected between the battery cell and the welding portion.

[0012] In some embodiments, the abutment is made of aerogel.

[0013] In some embodiments, the density of the abutment is 0.5 g / cm 3 ~1g / cm 3 .

[0014] In some embodiments, a seal is provided on one side wall, and the metal strip pole ear is electrically connected to the battery cell through the seal. The metal strip pole ear is wrapped with pole ear glue, and the pole ear glue is used to seal the seal.

[0015] Another aspect of the present invention provides an electronic device, which includes the lithium-ion battery as described above.

[0016] Compared with the related art, the beneficial effect of the technical solution of the utility model is that when the lithium-ion battery is subjected to a drop or roller test, even if the battery cell generates inertia to move toward the metal strip pole ear under external impact, the battery cell cannot approach the metal strip pole ear because an abutment is provided between the side wall connected to the metal strip pole ear and the battery cell, thereby avoiding the problem of the metal strip pole ear being inserted into the battery cell backwards. In this way, the utility model improves the anti-fall performance of the lithium-ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of a lithium-ion battery according to an embodiment of the utility model;

[0018] Figure 2 for Figure 1 A cross-sectional view of a lithium-ion battery in the AA direction;

[0019] Figure 3 for Figure 2 A three-dimensional diagram of a lithium-ion battery.

[0020] Description of Figure Numbers:

[0021] Shell 100 ; battery cell 200 ; metal strip tab 300 ; extension portion 310 ; welding portion 320 ; abutment member 400 ; first abutment portion 410 ; second abutment portion 420 ; foil tab 500 .

[0022] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, top, bottom, side...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0026] In addition, the descriptions involving "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features.

[0027] The utility model provides a lithium ion battery with improved anti-fall performance, combined with Figure 1 and Figure 2 As shown, the lithium-ion battery of this embodiment includes a housing 100, a battery cell 200 disposed in the housing 100, and a metal tab 300 electrically connected to the battery cell 200 and extending from a side wall of the housing 100. Exemplarily, the housing 100 of this embodiment is a rigid housing 100, such as a steel housing, an aluminum housing, a thermoplastic housing, etc. Of course, in order to reduce the weight of the lithium-ion battery, the housing 100 of this embodiment can also be a flexible housing 100, such as an aluminum-plastic film or a polyethylene film, etc., but is not limited thereto.

[0028] Continue to refer to Figure 2 As shown, the lithium-ion battery of this embodiment further includes an abutment member 400, which is located between the battery cell 200 and a side wall of the housing 100 connected to the metal strip tab 300, and one end of the abutment member 400 abuts against the battery cell 200, and the other end abuts against the side wall. It should be noted that the "side wall" in this paragraph and the following text refers to a side wall of the housing 100 through which the metal strip tab 300 passes.

[0029] In this embodiment, when the battery cell 200 moves toward the metal strip pole ear 300 under the action of external impact, the battery cell 200 is blocked by the abutment member 400 because the opposite ends of the abutment member 400 abut against the battery cell 200 and the side wall respectively, so that the battery cell 200 cannot approach the metal strip pole ear 300, thereby preventing the problem of the metal strip pole ear 300 being inserted into the battery cell 200 in reverse. For example: when the lithium-ion battery of this embodiment is dropped or drum-tested, even if the battery cell 200 generates inertia to move toward the metal strip pole ear 300 under external impact, the battery cell 200 is blocked by the abutment member 400 disposed between the side wall and the battery cell 200, so that the battery cell 200 cannot approach the metal strip pole ear 300, thereby avoiding the problem of the metal strip pole ear 300 being inserted into the battery cell 200 in reverse. In this way, the utility model improves the anti-fall performance of the lithium-ion battery.

[0030] In addition to preventing the battery cell 200 from approaching the metal strip tab 300, the abutment 400 of this embodiment can also play the role of supporting the shell 100 at the head position of the battery cell 200. For example, when the shell 100 is a flexible shell 100, it can also play the role of supporting the shell 100 at the head position of the battery cell 200. It can be understood that in the embodiment of the utility model, the shape and structure of the abutment 400 can be various. Figure 2 and Figure 3 As shown, in a preferred embodiment, the abutment member 400 includes a first abutment portion 410 and a second abutment portion 420 intersecting the first abutment portion 410, the first abutment portion 410 abuts against the side wall, and the second abutment portion 420 abuts against the battery cell 200. When the lithium-ion battery is packaged, the abutment member 400 can support the flexible shell 100 at the head position of the battery cell 200 to prevent the head position of the battery cell 200 from forming a depression, thereby improving the flatness of the lithium-ion battery. In this embodiment, since the abutment member 400 is provided with the intersecting first abutment portion 410 and the second abutment portion 420, it can support the problem of the formation of a depression at the head position of the battery cell 200 of the lithium-ion battery due to the bending portion of the foil tab 500 and the metal strip tab 300 being unable to fill the reserved space.

[0031] In another optional embodiment, the abutment member 400 may also be a column, located in any area between the battery cell 200 and the side wall. A plurality of abutment members 400 may also be provided. When there are a plurality of abutment members 400, they are preferably evenly distributed between the battery cell 200 and the side wall.

[0032] In another optional embodiment, the abutment 400 may be a plate extending along the width direction of the battery cell 200. The two opposite sides of the abutment 400 abut against the battery cell 200 and the side wall respectively. Since the abutment 400 is a plate, the contact area between the abutment 400 and the battery cell 200 is maximized, thereby preventing the abutment 400 from being inserted into the battery cell 200 backwards and causing internal damage to the battery when the lithium-ion battery is subjected to a large impact.

[0033] In the embodiment of the utility model, there are also multiple options for the size of the abutment member. Figure 3 As shown, the width of the battery cell 200 ( Figure 3 The direction c) in the figure is the reference direction, and the size difference between the battery cell 200 and the first abutting portion 410 is less than or equal to 0.3 mm. Preferably, the length of the first abutting portion 410 and the width of the battery cell 200 can be exactly the same, but due to the process precision, it is difficult to achieve that the length of the first abutting portion 410 and the width of the battery cell 200 are exactly the same in the actual implementation process. Therefore, the length of the first abutting portion 410 can be slightly smaller than the width of the battery cell 200. However, if the difference between the width of the battery cell 200 and the length of the first abutting portion 410 is too large, a depression will still be formed at the head position of the battery cell 200. Therefore, the maximum difference between the width of the battery cell 200 and the length of the first abutting portion 410 does not exceed 0.3 mm. For example: when the width of the battery cell 200 is 100 mm, the length of the first abutting portion 410 can be 99.7 mm, 99.8 mm, or 99.9 mm.

[0034] Continue to combine Figure 3 As shown, the thickness of the battery cell 200 ( Figure 3 The direction a) in the figure is the reference direction, and the size difference between the battery cell 200 and the first abutting portion 410 ranges from 0.1mm to 0.5mm. During the implementation process, it was found that if the difference between the thickness of the battery cell 200 and the width of the first abutting portion 410 is less than 0.1mm, the width of the first abutting portion 410 is too large, which will cause a bulge to be formed in the thickness direction of the lithium-ion battery after packaging, thereby affecting the flatness of the lithium-ion battery. If the difference between the thickness of the battery cell 200 and the width of the first abutting portion 410 is less than 0.5mm, a depression will still be formed at the head position of the battery cell 200 after packaging. Therefore, in the thickness direction of the battery cell 200, the difference between the thickness of the battery cell 200 and the width of the first abutting portion 410 should be kept in the range of 0.1mm to 0.5mm. For example: when the thickness of the battery cell 200 is 6mm, the width of the first abutting portion 410 can be 5.9mm, 5.7mm, or 5.5mm.

[0035] Specifically, continue to combine Figure 3As shown, in this embodiment, the second abutting portion 420 abuts against the battery cell 200, thereby preventing the battery cell 200 from approaching the metal strip tab 300 and supporting the flexible housing 100 at the head of the battery cell 200. Figure 3 b) is 2.8 mm to 3.8 mm. If the height of the second abutting portion 420 is greater than 3.8 mm, the overall volume of the lithium-ion battery will increase, which is not conducive to improving the energy density of the lithium-ion battery; and if the height of the second abutting portion 420 is greater than 2.8 mm, the effect of blocking the battery cell 200 from approaching the metal strip tab 300 will be reduced. Therefore, the height of the second abutting portion 420 of this embodiment can be 2.8 mm, 3.3 mm, or 3.8 mm.

[0036] Furthermore, in order to reduce the internal resistance of the battery cell 200, as Figure 2 and Figure 3 As shown, the metal strip tab 300 includes an extension portion 310 located outside the housing 100 and a welding portion 320 located inside the housing 100. Figure 2 or Figure 3 In the direction b), the welding portion 320 is arranged at intervals from the battery cell 200, and a plurality of foil tabs 500 are connected between the battery cell 200 and the welding portion 320.

[0037] Preferably, the abutment member 400 of this embodiment is made of aerogel. In order to improve the weight energy density of the lithium-ion battery, the density of the abutment member 400 is 0.5 g / cm 3 ~1g / cm 3 If the density of the abutment member 400 is greater than 1 g / cm 3 , it will affect the weight energy density of the lithium-ion battery; and if the density of the abutment member 400 is lower than 0.5 g / cm 3 , the abutment 400 is too fragile and cannot prevent the battery cell 200 from approaching the side wall. Therefore, the density of the abutment 400 of this embodiment can be selected to be 0.5 g / cm 3 , 0.75g / cm 3 , 1g / cm 3 .

[0038] Optionally, the side wall of this embodiment is provided with a seal, through which the metal strip tab is electrically connected to the battery core. The metal strip tab may also be wrapped with tab glue, which is used to seal the seal to prevent the electrolyte in the housing from leaking out.

[0039] The following table shows the drop test results of the lithium-ion battery of this embodiment.

[0040] Test Group Abutment Cell width Cell thickness Abutment width Thickness of abutment ED(Wh / L) ED(Wh / Kg) Yield 1 group none 63.88mm 4.2mm 0 0 710 300 33％ 2 groups have 63.88mm 4.2mm 63.78mm 4.1mm 710 296 100％ 3 groups have 63.88mm 4.2mm 63.78mm 4.1mm 710 298 100％ 4 groups have 63.88mm 4.2mm 63.98mm 4.1mm 708 298 100％ 5 groups have 63.88mm 4.2mm 63.78mm 4.3mm 696 298 100％

[0041] According to the test results, a contact piece is provided between the side wall of the lithium battery shell connected with the metal pole ear and the battery cell, which effectively improves the pass rate of the drop test of the lithium-ion battery, thereby proving that the lithium battery structure of this embodiment can improve the drop resistance of the lithium-ion battery.

[0042] It should be noted that the “width of the abutment member” in the above table refers to the width of the battery cell 200 ( Figure 3 The dimension of the abutment member when the direction c) in the figure is the reference direction. The "thickness of the abutment member" refers to the thickness of the battery cell 200 ( Figure 3 The dimension of the abutment when direction a) is the reference direction.

[0043] In some embodiments, an electronic device is also provided. The electronic device of this embodiment can be a personal intelligent device such as a smart phone, a tablet computer, a laptop computer, but is not limited thereto. The electronic device of this embodiment uses the lithium-ion battery provided in the above embodiment. Since the lithium-ion battery used in the electronic device is blocked by the abutment when the moving battery cell moves toward the metal strip pole ear even if it is subjected to an external impact, it cannot approach the metal strip pole ear, thus avoiding the problem of the metal strip pole ear being inserted into the battery cell backwards. Therefore, the electronic device of this embodiment has a certain anti-fall performance and has good safety.

[0044] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A lithium ion battery, characterized in that: include: Housing (100); A battery cell (200) is disposed in the housing (100); A metal strip tab (300) electrically connected to the battery core (200) and extending through a side wall of the housing (100); An abutment member (400) is located between the battery core (200) and the side wall, one end of the abutment member (400) abuts against the battery core, and the other end abuts against the side wall, and is used to prevent the battery core (200) from approaching the metal strip tab (300).

2. The lithium-ion battery according to claim 1, characterized in that The abutment member (400) comprises a first abutment portion (410) abutting against the one side wall and a second abutment portion (420) intersecting with the first abutment portion (410), wherein the second abutment portion (420) abuts against the battery core (200).

3. The lithium-ion battery according to claim 2, characterized in that: Taking the width direction of the battery core (200) as a reference direction, the size difference between the battery core (200) and the first abutment portion (410) is less than or equal to 0.3 mm.

4. The lithium-ion battery according to claim 2, characterized in that: Taking the thickness direction of the battery core (200) as a reference direction, the size difference between the battery core (200) and the first abutment portion (410) ranges from 0.1 mm to 0.5 mm.

5. The lithium-ion battery according to claim 2, characterized in that: The height of the second abutting portion (420) is 2.8 mm to 3.8 mm.

6. The lithium-ion battery according to claim 1, characterized in that The metal strip pole tab (300) comprises an extension portion (310) located outside the shell (100) and a welding portion (320) located inside the shell (100), and a plurality of foil pole tabs (500) are connected between the battery cell (200) and the welding portion (320).

7. The lithium-ion battery according to claim 1, characterized in that: The abutment member (400) is made of aerogel.

8. The lithium-ion battery according to claim 7, characterized in that: The density of the abutment member (400) is 0.5 g / cm 3 ~1g / cm 3 .

9. The lithium-ion battery according to claim 1, characterized in that: The side wall is provided with a seal, the metal strip tab (300) is electrically connected to the battery cell (200) via the seal, and tab glue is wrapped around the metal strip tab (300), and the tab glue is used to seal the seal.

10. An electronic device, characterized in that: Comprising a lithium ion battery as claimed in any one of claims 1 to 9.

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