Battery and battery pack

Abstract

The utility model provides a battery and a battery pack, the battery comprises a battery cell and colloid, the battery cell comprises a pole piece and a diaphragm, the diaphragm is provided with a first part and a second part along the height direction of the battery cell, the second part is arranged at two ends of the first part, the first part is overlapped with the pole piece, and the second part protrudes out of two ends of the pole piece. The plurality of second parts positioned at the same end of the pole piece are arranged towards the central area of the battery cell along the thickness direction of the battery cell, and the plurality of second parts are adhered through colloid to form insulation structures arranged on the top surface and the bottom surface of the pole piece. According to the battery, the second part, extending out of the pole piece, of the diaphragm forms the insulation structure wrapping the top surface and the bottom surface of the pole piece, so that the problem that the positive electrode and the negative electrode cannot be insulated due to shrinkage of the diaphragm when thermal runaway occurs is avoided, the probability of thermal runaway is reduced, and the use safety of the battery is improved; the problem that a battery diaphragm in the prior art is prone to thermal runaway due to thermal shrinkage in a high-temperature environment is solved.

Description

Technical Field

[0001] This application relates to the field of battery-related technology, and more specifically, to a battery and a battery pack. Background Technology

[0002] With the continuous development of battery technology, the requirements for battery density are becoming increasingly stringent. In existing lithium battery technology, the separator, as the insulating medium between the positive and negative electrodes inside the battery, plays a crucial role in the safety and stability of the battery. As the market's demands for battery energy density and voltage continue to rise, high-capacity and high-energy-density battery designs are becoming increasingly common. However, this design trend also brings the risk of thermal abuse failure, especially when the battery encounters abnormally high temperatures during use or charging. In such cases, the thermal stability of the separator becomes a critical consideration.

[0003] Traditional lithium-ion battery separators, especially polyolefin-based separators, suffer from thermal shrinkage. This shrinkage disrupts the separator's original stable structure, leading to direct contact between the positive and negative electrodes and causing an internal short circuit. An internal short circuit can trigger thermal runaway, a dangerous state characterized by a rapid increase in internal battery temperature that can lead to combustion or explosion. Thermal runaway not only reduces battery lifespan but, more importantly, poses a serious safety hazard to the equipment and personnel using the battery.

[0004] As can be seen from the above, the current battery separators are prone to thermal runaway due to thermal shrinkage under high temperature conditions. Utility Model Content

[0005] The main objective of this invention is to provide a battery and battery pack that solves the problem that the separator of a battery in the prior art will shrink under high temperature conditions, which can easily lead to thermal runaway.

[0006] To achieve the above objectives, according to one aspect of the present invention, a battery is provided, the battery including a cell and a gel, the cell including an electrode and a separator, an electrode being disposed between two adjacent separators along the thickness direction of the cell, the separator having a first portion and a second portion along the height direction of the cell, the second portion being disposed at both ends of the first portion, the first portion being stacked with the electrode, the second portion protruding from both ends of the electrode, a plurality of second portions located at the same end of the electrode being disposed along the thickness direction of the cell toward the central region of the cell, the plurality of second portions being bonded together by the gel to form an insulating structure disposed on the top and bottom surfaces of the electrode.

[0007] Furthermore, the second portions at both ends of the first portion along the height direction of the battery cell are symmetrically arranged about the first portion.

[0008] Furthermore, the insulation structure has a clearance channel, through which the tabs of the electrode sheet pass.

[0009] Furthermore, multiple second parts are provided, and the multiple second parts form flush bonding ends in the bonding area, with the bonding ends of the multiple second parts stacked along the thickness direction of the battery cell.

[0010] Furthermore, the electrode includes a positive electrode and a negative electrode, and along the thickness direction of the cell, a separator is provided on both sides of the positive electrode and both sides of the negative electrode.

[0011] Furthermore, the battery is a square battery, and the cell is formed by winding a separator and an electrode; or the cell is formed by stacking a separator and an electrode.

[0012] Furthermore, an insulating coating is provided on one side of the diaphragm; or an insulating coating is provided on both sides of the diaphragm.

[0013] Furthermore, the adhesive is a UV adhesive; and / or the adhesive is used to bond the second part by dispensing.

[0014] Furthermore, the battery also includes a casing, an insulating structure disposed between the bottom surface of the casing and the electrode plates, and an insulating structure disposed between the bottom surface of the casing cover plate and the electrode plates.

[0015] According to one aspect of the present invention, a battery pack is provided, the battery pack including the battery described above.

[0016] By applying the technical solution of this utility model, the battery of this application adopts a second part of the separator extending out of the electrode to form an insulating structure disposed on the top and bottom ends of the electrode, so as to realize the structure of the separator covering the electrode. After multiple second parts are fixed by the colloid, they form an integral insulating structure, which effectively avoids the problem that the separator cannot insulate the positive and negative electrodes due to shrinkage when thermal runaway occurs, thereby reducing the probability of thermal runaway and improving the safety of battery use.

[0017] The multiple second parts located at the same end of the electrode in this application are arranged in a mutually oriented manner, which facilitates fixing the multiple second parts by means of adhesive bonding, and completes the setting on the top and bottom surfaces of the electrode. The structure is simple, the operation is convenient, and it is beneficial to improve assembly efficiency. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, 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 undue limitation of the present invention. In the drawings:

[0019] Figure 1 A front view of the electrode and colloid assembly of the battery cell of this utility model is shown;

[0020] Figure 2 A top view of the battery cell of this utility model is shown;

[0021] Figure 3 A bottom view of the battery cell of this utility model is shown;

[0022] Figure 4 A schematic diagram of the structure of the present invention, showing the electrode and separator arranged along the thickness direction of the battery cell, is shown.

[0023] The above figures include the following reference numerals:

[0024] 10. Electrode; 110. Tab; 20. Colloid; 30. Diaphragm; 310. Second part; 320. First part; 330. Clearance channel; 340. Adhesive end. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0028] In order to solve the problem that the separator of the battery in the prior art will shrink under high temperature environment, which will easily lead to thermal runaway, this application provides a battery pack, which includes multiple batteries.

[0029] The battery of this application has a structure in which the electrode sheets are covered by a separator, thereby achieving insulation of the separator in high-temperature environment, so as to avoid the possibility of contact between the positive and negative electrodes of the battery, thereby reducing the probability of thermal runaway, improving battery life and safety of use. The insulating effect of the separator also improves the stability of battery use, which is conducive to improving the user experience.

[0030] In this embodiment, the battery is a square aluminum-cased battery.

[0031] like Figures 1 to 4As shown, the battery includes a cell and a gel 20. The cell includes an electrode 10 and a separator 30. An electrode 10 is disposed between two adjacent separators 30 along the thickness direction of the cell. The separator 30 has a first portion 320 and a second portion 310 along the height direction of the cell. The second portion 310 is disposed at both ends of the first portion 320. The first portion 320 is stacked with the electrode 10. The second portion 310 protrudes from both ends of the electrode 10. Multiple second portions 310 located at the same end of the electrode 10 are disposed along the thickness direction of the cell toward the central region of the cell. The multiple second portions 310 are bonded together by the gel 20 to form an insulating structure disposed on the top and bottom surfaces of the electrode 10.

[0032] The electrode 10 includes a positive electrode and a negative electrode. A separator 30 is provided on both sides of the positive electrode and both sides of the negative electrode along the thickness direction of the battery cell. That is, a separator 30 is provided between the positive and negative electrode to insulate them. A separator 30 is provided at both ends along the stacking direction of the positive and negative electrode, so that after the second part 310 of the separator 30 is bonded, the electrode 10 is located inside the space formed by the separator 30, ensuring that both the bottom and top surfaces of the electrode 10 have insulating structures.

[0033] It is understood that the first part of the separator 30 of this application is stacked with the electrode 10 along the thickness direction of the cell to insulate the positive and negative electrodes in the thickness direction. The second part 310 is disposed at both ends of the first part along the height direction of the cell and extends to the outside of the electrode 10. The second part 310 is provided on both the top and bottom surfaces of the electrode 10. During the battery assembly process, because the separator 30 is flexible, the second part 310 can be pressed to fit the top and bottom surfaces of the electrode 10. It should be noted that because the separator 30 of this application can be adaptively deformed according to the installation space, therefore... Figure 4 The diagram shown is of the state where the button is not pressed.

[0034] In this embodiment, multiple second parts 310 are bonded and fixed by the colloid 20 and stacked along the thickness direction of the battery cell. The separators 30 arranged on both sides of the same electrode 10 along the thickness direction of the battery cell cooperate to form a ring structure wrapped around the electrode 10. Compared with the sheet-like structure of the separator 30 in the prior art, the ring structure is arranged on the outer periphery of the electrode 10 to form a constraint. Since it does not have free ends, it is not easy for the separator 30 to shrink at high temperature, which would cause the positive electrode and the negative electrode to come into contact and cause thermal runaway.

[0035] Specifically, the battery of this application adopts a separator 30 extending out of the second part 310 of the electrode 10 and bonded and fixed to form an insulating structure disposed on the top and bottom surfaces of the electrode 10, so as to realize the structure of the separator 30 covering the electrode 10. After the separator 30 is fixed by the colloid 20, it covers the electrode 10, which effectively avoids the problem that the separator 30 cannot insulate the positive and negative electrodes due to shrinkage when thermal runaway occurs, thereby reducing the probability of thermal runaway and improving the safety of battery use.

[0036] The diaphragm 30 of this application has a plurality of second parts 310 arranged in a mutually oriented manner, which facilitates the fixing of the plurality of second parts 310 by means of adhesive 20, and completes the setting on the top and bottom surfaces of the electrode 10. The structure is simple, the operation is convenient, and it is beneficial to improve the assembly efficiency.

[0037] In this embodiment, the height of the battery cell is Figure 1 The thickness direction of the battery cell is shown in the Z direction. Figure 2 The X-direction shown indicates that the length direction of the battery cell is... Figure 2 Y direction shown.

[0038] In this embodiment, the adhesive 20 is a UV adhesive. The adhesive 20 is used to bond multiple second parts 310 by dispensing. Specifically, a dispensing machine is used to perform the dispensing operation so as to achieve bonding and fixing of multiple second parts 310 through dispensing technology.

[0039] In this embodiment, the colloid 20 is fixed by irradiation with an ultraviolet lamp or ultraviolet curing equipment. Compared with traditional encapsulation technologies, the setup in this application has low energy consumption and does not produce harmful gases, making it environmentally friendly. Furthermore, the technique of using UV-cured adhesive to fix the diaphragm 30 is simple and easy to implement, and the encapsulation effect is excellent.

[0040] In this embodiment, the battery cell structure can be formed by winding the separator 30 and the electrode 10, that is, by winding the electrode 10 and the separator 30 using a battery cell winding fixture to form the battery cell; alternatively, the battery cell structure can be formed by stacking the separator 30 and the electrode 10, by sequentially stacking the electrode 10 and the separator 30 along the thickness direction to form the battery cell. The specific arrangement structure of the battery cell can be adaptively configured as needed.

[0041] In this embodiment, the surface of the separator 30 has an insulating coating to insulate the positive and negative electrodes, preventing conductive contact between them. The insulating coating can be provided on one side of the separator 30 or on both sides.

[0042] like Figure 4 As shown, the second portions 310 at both ends of the first portion 320 along the height direction of the cell are symmetrically arranged about the first portion 320.

[0043] Specifically, the symmetrical arrangement of the second part 310 facilitates the formation of a symmetrical insulating structure on the top and bottom surfaces of the electrode 10, which helps to improve the overall insulation effect and enhance the safety of battery use.

[0044] In this embodiment, the insulation structure has a clearance channel 330, and the tab 110 of the electrode 10 passes through the clearance channel 330.

[0045] Among them, such as Figure 1 As shown, the clearance channel 330 provides clearance for the extension of the tab 110, so that the tab 110 can pass through the clearance channel 330 and be welded to the electrode post. The positive electrode plate has a positive tab, and the negative electrode plate has a negative tab. There are two clearance channels 330, one clearance channel 330 for the positive tab to pass through, and the other clearance channel 330 for the negative tab to pass through.

[0046] In this embodiment, multiple second portions 310 are provided, and the multiple second portions 310 form flush adhesive ends 340 in the adhesive area. The adhesive ends 340 of the multiple second portions 310 are stacked along the thickness direction of the battery cell.

[0047] Specifically, the bonding end 340 of this application is formed by cutting, that is, the second part 310 of the separator 30 is brought closer to the middle along the thickness direction of the cell. The second part 310 on the outside is lower in height than the second part 310 on the inside because the part that needs to be bent is larger. Therefore, after bonding multiple second parts 310 to form a structure stacked along the thickness direction of the cell, the bonding end 340 of multiple second parts 310 is formed by cutting in the bonding area. The bonding end 340 is parallel to the top and bottom surfaces of the cell.

[0048] In this embodiment, the battery also includes a casing, and the battery cell is disposed inside the casing. The casing has the function of protecting and fixing the battery cell. After the battery cell is placed inside the casing, an insulating structure is disposed between the bottom surface of the casing and the electrode 10, which further strengthens the bottom insulation of the electrode 10 of the battery cell. The insulating structure is disposed between the bottom surface of the cover plate of the casing and the electrode 10, which helps to further strengthen the insulation of the top side of the electrode 10.

[0049] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0050] The battery of this application adopts a separator 30 extending out of the second part 310 of the electrode 10 and bonded and fixed to form an insulating structure on the top and bottom surfaces of the electrode 10, so as to realize the structure of the separator 30 covering the electrode 10. After the separator 30 is fixed by the colloid 20, it covers the electrode 10, which effectively avoids the problem that the separator 30 cannot insulate the positive and negative electrodes due to shrinkage when thermal runaway occurs, thereby reducing the probability of thermal runaway and improving the safety of battery use.

[0051] The diaphragm 30 of this application has multiple second parts 310 located at the same end of the electrode 10, which are arranged in a mutually oriented manner. This facilitates the fixing of the multiple second parts 310 by using adhesive 20 to bond them together, thus completing the arrangement on the top and bottom surfaces of the electrode 10. The structure is simple, the operation is convenient, and it is beneficial to improve assembly efficiency.

[0052] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0055] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery, characterized by, The battery comprises: an electric core comprising a tab (10) and a diaphragm (30), the diaphragm (30) and the tab (10) being arranged alternately along the thickness direction of the electric core, the diaphragm (30) having a first part (320) and a second part (310) along the height direction of the electric core, the second part (310) being arranged at both ends of the first part (320), the first part (320) being overlapped with the tab (10), and the second part (310) protruding from both ends of the tab (10); a glue (20) being arranged between a plurality of the second parts (310) at the same end of the tab (10) and the center area of the electric core along the thickness direction of the electric core, and the plurality of the second parts (310) being bonded by the glue (20) to form an insulation structure arranged on the top surface and the bottom surface of the tab (10).

2. The battery of claim 1, wherein, The second parts at both ends of the first part (320) along the height direction of the electric core are symmetrically arranged with respect to the first part (320).

3. The battery of claim 1, wherein, The insulation structure has a bypass channel (330), and a tab lug (110) of the tab (10) penetrates through the bypass channel (330).

4. The battery of claim 1, wherein, A plurality of the second parts (310) are arranged, and the plurality of the second parts (310) form flush bonding ends (340) at the bonding area, and the bonding ends (340) of the plurality of the second parts (310) are overlapped along the thickness direction of the electric core.

5. The battery according to claim 1, wherein the tab (10) comprises a positive tab and a negative tab, and the diaphragm (30) is arranged on both sides of the positive tab and both sides of the negative tab along the thickness direction of the electric core.

6. The battery of any one of claims 1 to 5, wherein, The battery is a square battery, the electric core is formed by winding the diaphragm (30) and the tab (10); or the electric core is formed by stacking the diaphragm (30) and the tab (10).

7. The battery according to any one of claims 1 to 5, wherein the diaphragm (30) is provided with an insulating coating on one side; or the diaphragm (30) is provided with an insulating coating on both sides.

8. The battery according to any one of claims 1 to 5, wherein the glue (20) is UV glue; and / or the glue (20) bonds the second parts (310) by dispensing.

9. The battery of any one of claims 1 to 5, wherein, The battery further comprises a shell, and the electric core is arranged in the interior of the shell, the insulation structure is arranged between the bottom surface of the shell and the tab (10); and / or the insulation structure is arranged between the bottom surface of the cover plate of the shell and the tab (10).

10. A battery pack, characterized by, The battery comprises the battery according to any one of claims 1 to 9.

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