Lithium ion battery with automatic cut-off function

By incorporating a terminal post connection, a tab connection, and a fuse in the lithium-ion battery adapter, and by providing openings and slots between adjacent fuses, the problem of thermal runaway in lithium-ion batteries during external short-circuit testing is solved, thereby improving battery safety and manufacturing efficiency.

CN223462388UActive Publication Date: 2025-10-21广东瑞浦兰钧能源有限公司
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Patent Information

Application Number
CN202422400815.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-30
Publication Date
2025-10-21
Estimated Expiration
2034-09-30

AI Technical Summary

Technical Problem

Existing lithium-ion batteries cannot meet the requirements of the new national standard in external short-circuit tests. The increased temperature of the adapter leads to thermal runaway and leakage due to sealing failure.

Method used

Design a lithium-ion battery with automatic cut-off function. By setting a terminal connection part, a tab connection part and a fuse part in the adapter piece, and setting an opening part and a slot part between adjacent fuse parts, it is ensured that the battery will automatically melt and completely cut off the circuit under high current and high temperature.

Benefits of technology

It improves battery safety performance, reduces manufacturing difficulty and cost, ensures complete disconnection of the adapter piece, and meets the requirements of the new national standard.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of batteries, and discloses a lithium ion battery with an automatic cut-off function, which comprises a switching piece, a top cover, a top cover, a top cover and a top cover, one side, far away from the pole connecting part, of the tab connecting part is connected through a positioning part, and the tab connecting part is electrically connected with a tab with corresponding electrical polarity of the pole connecting part; the fusing parts are connected with the tab connecting part and the pole connecting part, a hole opening part is arranged between every two adjacent fusing parts, and one side, facing the positioning part, of each hole opening part is connected with a slotting part. According to the utility model, the positioning part is arranged to provide a positioning reference for the installation of the switching sheet, the positioning requirement is low, the cross sectional area of the fusing part is reduced through the arrangement of the hole opening part, the switching sheet is ensured to be automatically fused at a high temperature under a large current, and the slotting part is arranged to ensure that the switching sheet cannot be damaged after the switching sheet is fused. And the tab connecting parts on the two sides of the slotting part are naturally separated due to self weight, so that the tab connecting parts cannot be lapped to the position of the pole column, and the thorough cutting of the adapter plate is ensured.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field relates to a lithium ion battery with automatic cutout function. BACKGROUND

[0002] With the application scene of lithium ion more and more widely, the safety of battery also changes more and more strict. For example, the previous national standard requirement of external short circuit is lower than 5mΩ external load, the newly published energy storage national standard improves the requirement lower than 1mΩ, according to the new test requirement, the original structure design has been unable to satisfy the new national standard requirement, since with the increase of overcurrent, the temperature of the adapter piece will increase, generates thermal runaway, thereby leading to the plastic class is dissolved and destroyed after being subjected to high temperature at the pole, eventually leading to the failure of sealing and leakage.

[0003] Therefore, there is an urgent need in the art for a lithium ion battery with automatic cutout function to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the utility model aims at solving the above problems, providing a lithium ion battery with automatic cutout function, including top cover and at least two bare electric core, the top cover is provided with the pole of opposite polarity, each bare electric core includes main body and the pole lug with opposite polarity of electric connection in the main body and from the main body, the lithium ion battery further includes:

[0005] Adapter piece, the adapter piece includes:

[0006] Pole connecting portion, for being electrically connected with the pole of corresponding polarity of the top cover;

[0007] Pole lug connecting portion, the number of the bare electric core is consistent, each pole lug connecting portion is connected away from the pole connecting portion side through the positioning portion, and the pole lug connecting portion is used for electrically connecting the pole lug of the corresponding polarity of the pole connecting portion;

[0008] Fusing portion, the number of the pole lug connecting portion is consistent, the fusing portion connects the pole lug connecting portion and the pole connecting portion, and the opening portion is provided between adjacent fusing portions, and the opening portion is connected with the slit portion on the side of the positioning portion.

[0009] As a further improvement of the utility model, the bare electric core is two, the pole lug connecting portion is two, the fusing portion is two, and the two bare electric cores are connected in parallel to the adapter piece.

[0010] As a further improvement of the utility model, the positioning portion is provided with an arc-shaped avoiding portion away from the slit portion side.

[0011] As a further improvement of the utility model, the slit portion is perpendicular to the midpoint of the opening portion.

[0012] As a further improvement of the utility model, the length of the opening part is 6% to 15% of the length of the pole connecting part on the side where the opening part is located.

[0013] As a further improvement of the utility model, the width of the opening part ranges between 1mm and 8mm.

[0014] As a further improvement of the utility model, the length of the positioning part ranges between 3mm and 10mm.

[0015] As a further improvement of the utility model, the tab connecting part and the corresponding tab of the bare cell are connected through welding.

[0016] As a further improvement of the utility model, the pole connecting part and the corresponding pole of the top cover are connected through welding.

[0017] As a further improvement of the utility model, the adapter sheet is a single-layer or multi-layer metal sheet.

[0018] The technical effect of the utility model is that, compared with the prior art, the lithium ion battery with automatic cutting function provided by the utility model provides a positioning reference for the installation of the adapter sheet through the positioning part, the positioning requirement is low, the manufacturing yield is improved, and the cost is reduced, the cross-sectional area of the fuse part is reduced through the opening part arranged between adjacent fuse parts, the automatic fusing of the adapter sheet at high temperature and large current is ensured, the opening slit part is connected to one side of the positioning part through the setting of the opening part, after the fusing of the adapter sheet, the tab connecting parts on both sides of the opening slit part are naturally separated due to their own weight, it is ensured that the tab connecting parts will not be overlapped on the pole position, and the complete cutting of the adapter sheet is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only a part of the embodiments of the utility model, but not all the embodiments, and for those skilled in the art, other drawings obtained according to these drawings without creative labor belong to the protection range of the utility model.

[0020] Figure 1 is a perspective view of the lithium ion battery with automatic cutting function provided by the embodiment of the utility model;

[0021] Figure 2 is an internal structure view of the lithium ion battery with automatic cutting function provided by the embodiment of the utility model;

[0022] Figure 3 is a perspective view of a switching piece of a lithium ion battery with automatic cutting function.

[0023] Wherein, 10 is a top cover, 11 is a pole, 20 is a bare battery cell, 21 is a battery cell main body, 22 is a tab, 30 is a switching piece, 31 is a pole connecting part, 32 is a tab connecting part, 321 is a positioning part, 322 is an arc-shaped avoiding part, 33 is a fuse part, 331 is an opening part, and 332 is a slit part. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0025] In order to make the description of the disclosure more detailed and complete, the following describes the embodiments of the utility model and specific embodiments; but this is not the only form of implementation or use of the specific embodiments of the utility model. The embodiments include the features of the specific embodiments and the method steps and order used to construct and operate these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0027] It should be understood that the terms "first", "second", and the like in the specification and claims of the utility model and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0028] In the description of the utility model, the terms "front", "back", "top", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0029] Referring to Figures 1-3 An embodiment of the utility model provides a lithium ion battery with automatic cutout function to solve the problem of battery structure overcurrent increase, adapter piece temperature increase, thermal runaway, and high temperature of pole post, leading to battery sealing failure.

[0030] Specifically, referring to Figure 1 A perspective view of a lithium ion battery with automatic cutout function is provided, the utility model provides a lithium ion battery with automatic cutout function, including top cover 10 and at least two bare electric core 20, top cover 10 is provided with the pole post 11 of opposite polarity, referring to Figure 2 An internal structure diagram of a lithium ion battery with automatic cutout function is provided, each bare electric core 20 includes electric core main body 21 and the pole lug 22 with opposite polarity electrically connected to electric core main body 21 and from electric core main body 21, the lithium ion battery also includes: adapter piece 30, at least two bare electric core 20 is connected by adapter piece 30 in series or parallel, forms battery pack to meet the demand of different voltage or capacity.

[0031] Further, the adapter piece 30 includes: pole post connecting portion 31, pole lug connecting portion 32 and fuse portion 33. The pole post connecting portion 31 is connected with the memory to ensure the electrical connection of the lithium ion battery and external circuit, the pole lug connecting portion 32 is connected with the pole lug 22, realizes the electrical series connection or parallel connection of single battery to battery pack. The fuse portion 33 will fuse when the current abnormally increases to a certain extent, the circuit is disconnected, the battery overheating or damage is prevented, and the safety performance of the battery is improved.

[0032] Specifically, the pole connecting part 31 is used for electrically connecting with the pole 11 of the corresponding polarity of the top cover 10, in this embodiment, the pole connecting part 31 is electrically connected with the negative pole 11 of the top cover 10, the lug connecting parts 32 are consistent in number with the bare battery cell 20, each lug connecting part 32 is connected through the positioning part 321 away from the pole connecting part 31 side, by setting the lug connecting part 32 away from the pole connecting part 31 side through the positioning part 321, the positioning part 321 provides a positioning reference for the installation of the adapter sheet 30, ensures that the adapter sheet 30 can be accurately positioned and installed when installed, the positioning requirement is low, improves the manufacturing yield, reduces the cost, avoids the installation error of the mounting sheet affecting the melting effect of the melting part 33, the lug connecting part 32 is used for electrically connecting the lug 22 of the corresponding polarity of the pole connecting part 31; the melting part 33 is consistent in number with the lug connecting part 32, the melting part 33 connects the lug connecting part 32 and the pole connecting part 31, and the opening part 331 is arranged between adjacent melting parts 33, by arranging the opening part 331 between adjacent melting parts 33, the cross-sectional area of the melting part 33 is reduced, and it is ensured that the adapter sheet 30 can be automatically melted at a large current and high temperature, the opening slit part 332 is connected to the side of the positioning part 321 of the opening part 331, by arranging the opening slit part 332 connected to the side of the positioning part 321 of the opening part 331, it is ensured that the lug connecting parts 32 on both sides of the opening slit part 332 are naturally separated due to their own weight after the melting of the adapter sheet 30, it is ensured that the lug connecting part 32 will not be overlapped on the pole 11 position, and the complete cutting of the adapter sheet 30 is ensured.

[0033] As a further improvement of the utility model, the bare battery cell 20 is two, the lug connecting part 32 is two, the melting part 33 is two, and the two bare battery cells 20 are connected in parallel to the adapter sheet 30. By setting the bare battery cell 20 to be two, the lug connecting part 32 to be two, the melting part 33 to be two, and the two bare battery cells 20 to be connected in parallel to the adapter sheet 30, the effective parallel connection of the battery cell is realized, and the safety of the battery system is enhanced.

[0034] As a further improvement of the utility model, please see Figure 3 , the positioning part 321 is provided with an arc-shaped avoiding part 322 away from the opening slit part 332 side. By setting the arc-shaped avoiding part 322 away from the opening slit part 332 side of the positioning part 321, it is ensured that the adapter sheet 30 is stably connected, and space is provided for other components on the cover plate to smoothly pass, for example, a liquid injection hole. At the same time, the setting of the arc-shaped avoiding part 322 further provides a positioning reference for the adapter sheet 30, facilitating the installation of the adapter sheet 30.

[0035] As a further improvement of the utility model, the slit part 332 is arranged perpendicularly to the midpoint of the hole part 331, and by arranging the slit part 332 perpendicularly to the midpoint of the hole part 331, the size of the tab connecting part 32 on both sides of the slit part 332 is ensured to be consistent, and after the adapter piece 30 is fused, the tab connecting part 32 on both sides of the slit part 332 is naturally separated due to its own weight, the area of the tab connecting part 32 on one side is prevented from being too large and being overlapped to the position of the pole 11, the complete cutting of the adapter piece 30 is ensured, and the safety of the battery is increased.

[0036] As a further improvement of the utility model, the length of the hole part 331 is 6% to 15% of the length of the pole connecting part 31 on the side where the hole part 331 is located.

[0037] As a further improvement of the utility model, the width of the hole part 331 is between 1mm and 8mm. Preferably, the width of the hole part 331 is between 4mm.

[0038] As a further improvement of the utility model, the length of the positioning part 321 is between 3mm and 10mm. Preferably, the length of the positioning part 321 is 6mm.

[0039] As a further improvement of the utility model, the tab connecting part 32 and the corresponding tab 22 of the bare battery cell 20 are connected by welding. Of course, it is not limited to this, and other electrical connection methods can also be used.

[0040] As a further improvement of the utility model, the pole connecting part 31 and the corresponding pole 11 of the top cover 10 are connected by welding. Of course, it is not limited to this, and other electrical connection methods can also be used.

[0041] As a further improvement of the utility model, the adapter piece 30 is a single-layer or multi-layer metal sheet. Further, when the adapter piece 30 is a multi-layer metal sheet, the thickness of the multi-layer metal sheet can be the same or different.

[0042] The technical features of the above embodiments can be combined in any manner, and to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0043] The above embodiment only expresses the preferred implementation of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A lithium ion battery having an automatic cut-off function, comprising a top cover provided with pole posts of opposite polarity and at least two bare cells, each bare cell comprising a main body and a tab of opposite polarity electrically connected to and extending from the main body, characterized in that, The lithium ion battery further comprises: The adapter piece comprises: A pole connecting portion for electrically connecting with the pole of the corresponding polarity of the top cover; An ear connecting portion consistent in number with the bare battery cell, each ear connecting portion being connected by a positioning portion away from the side of the pole connecting portion, the ear connecting portion being used for electrically connecting the pole of the corresponding polarity of the pole connecting portion; A fuse portion consistent in number with the ear connecting portion, the fuse portion connecting the ear connecting portion and the pole connecting portion, an opening portion being provided between adjacent fuse portions, the opening portion being connected with a slit portion toward the side of the positioning portion.

2. The lithium ion battery having an automatic cut-off function according to claim 1, characterized by, The bare battery cell is two, the ear connecting portion is two, the fuse portion is two, and the two bare battery cells are connected in parallel to the adapter piece.

3. The lithium ion battery with automatic cut-off function according to claim 1, characterized in that, The positioning portion is provided with an arc-shaped avoiding portion away from the side of the slit portion.

4. The lithium ion battery with automatic cut-off function according to claim 1, characterized in that, The slit portion is perpendicular to the midpoint of the opening portion.

5. The lithium ion battery with automatic cut-off function according to claim 1, characterized in that, The length of the opening portion is 6% to 15% of the length of the pole connecting portion on the side where the opening portion is located.

6. The lithium ion battery with automatic cut-off function according to claim 1, characterized in that, The width of the opening portion ranges between 1mm to 8mm.

7. The lithium-ion battery with automatic cut-off function according to claim 6, characterized in that, The length of the positioning portion ranges between 3mm to 10mm.

8. The lithium ion battery with automatic cut-off function according to claim 1, characterized in that, The ear connecting portion is connected with the corresponding ear of the bare battery cell by welding.

9. The lithium ion battery with automatic cut-off function according to claim 1, characterized in that, The pole connecting portion is connected with the corresponding pole of the top cover by welding.

10. The lithium ion battery with automatic cut-off function according to claim 1, characterized in that, The adapter piece is a single-layer or multi-layer metal piece.