Battery and terminal equipment

Abstract

The utility model relates to a battery and terminal equipment, the battery comprises a shell, a battery cell and an insulation assembly, the shell comprises an open shell with an accommodating space and a cover plate covering the opening of the shell; the battery cell is arranged in the accommodating space in the shell, and the first top surface, facing the cover plate, of the battery cell is provided with a tab; the insulation assembly is of a cap-shaped structure comprising a first insulation part and a second insulation part, the first insulation part is arranged between the first top surface and the cover plate, and the circumferential edge of the first insulation part extends towards the battery cell to form the second insulation part at least surrounding the part of the battery cell. According to the battery, the first insulating part between the first top surface and the cover plate extends towards the battery cell to form the second insulating part, and the second insulating part enables the battery cell and the first insulating part to be relatively fixed, so that short circuit of the battery cell and the cover plate caused by dislocation of the first insulating part in installation is avoided, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of electric devices, and in particular to a battery and a terminal device. BACKGROUND

[0002] With the improvement of battery technology, the energy density of the battery is gradually increased, and the safety problem of the battery comes along.

[0003] At present, there is a short circuit risk between the battery cell and the cover plate, and there is inevitably an error during assembly, which further increases the short circuit risk between the battery cell and the cover plate. CONTENT OF THE UTILITY MODEL

[0004] To overcome the problems in the related art, the present disclosure provides a battery and a terminal device.

[0005] According to a first aspect of the embodiments of the present disclosure, a battery is provided, comprising:

[0006] a shell comprising an open shell having a containing space and a cover plate arranged on the opening of the shell;

[0007] a battery cell arranged in the containing space in the shell, the battery cell being provided with a tab towards a first top surface of the cover plate;

[0008] an insulation assembly, the insulation assembly being a cap-shaped structure comprising a first insulation part and a second insulation part, the first insulation part being arranged between the first top surface and the cover plate, and the circumferential edge of the first insulation part extending towards the battery cell to form the second insulation part at least surrounding part of the battery cell.

[0009] In some embodiments, the insulation assembly comprises at least an insulation layer and a protective layer arranged in a stacking manner along the thickness direction of the insulation assembly, and the melting point of the protective layer is lower than the melting point of the insulation layer.

[0010] In some embodiments, the protective layer is arranged on the side of the insulation layer facing the battery cell.

[0011] In some embodiments, the thickness of the insulation assembly is T1, the thickness of the protective layer is T2, and the relationship between the thickness T1 of the insulation assembly and the thickness T2 of the protective layer satisfies: 0.05≤T2 / T1≤0.6.

[0012] In some embodiments, the battery cell comprises a circumferential side surface connected to the first top surface;

[0013] the second insulation part is parallel to the circumferential side surface in the extension direction of the second insulation part; or

[0014] the second insulation part is arranged in an expanding manner from one side of the first insulation part towards the battery cell.

[0015] In some embodiments, the second insulation part is arranged to expand from one side of the first insulation part towards the direction of the battery cell, and an included angle between the second insulation part and the peripheral side surface is less than or equal to an angle threshold.

[0016] In some embodiments, the second insulation part at least partially overlaps with the battery cell in the extending direction of the second insulation part, and an overlapping length L satisfies: a first length threshold ≤ L ≤ a second length threshold, the first length threshold is less than the second length threshold, and the first length threshold and the second length threshold satisfy that the second insulation part has the capability of restricting the battery cell in a direction perpendicular to the extending direction of the second insulation part.

[0017] In some embodiments, the cover plate is provided with a pole, the first insulation part is provided with a through hole through which the tab passes, and the insulation assembly further comprises a third insulation part arranged between the first insulation part and the cover plate, the third insulation part is arranged on the line connecting the pole and the through hole, and the tab connected with the pole is connected around the side of the third insulation part.

[0018] In some embodiments, the pole includes at least a positive pole, and the tab includes at least a positive tab, the positive tab includes a tab body and a bridging part, the battery cell, the tab body and the bridging part are sequentially connected, and the bridging part is made of a material different from that of the tab body.

[0019] The tab body is located between the battery cell and the third insulation part, and the bridging part is connected around the side of the third insulation part and connected with the positive pole.

[0020] In some embodiments, the distance between the tab body and the cover plate is greater than or equal to a first distance threshold, and the first distance threshold satisfies that the tab body is insulated from the cover plate.

[0021] In some embodiments, the shell is provided with a liquid injection hole communicating between the inside and the outside of the shell, and the relationship between the number N of the liquid injection hole and the capacity A of the battery cell satisfies: 0.4 ≤ A / n ≤ 1.1, wherein the capacity A of the battery cell is in Ah.

[0022] In some embodiments, the number of the liquid injection hole provided in the cover plate is less than or equal to a first number threshold.

[0023] In some embodiments, the shell is provided with an anti-explosion groove, the depth of the anti-explosion groove is H, the thickness of the shell is D, and the depth H of the anti-explosion groove and the thickness D of the shell satisfy: 5% ≤ H / D ≤ 60%.

[0024] According to a second aspect of the embodiments of the present disclosure, a terminal device is provided, which comprises the battery cell in the embodiments of the present disclosure.

[0025] The technical scheme provided by the embodiment of the present disclosure can have the following beneficial effects: in the present disclosure, the end of the battery cell with the tab is wrapped by the insulating assembly with a cap-shaped structure arranged between the battery cell and the cover plate, so that the side of the battery cell with the tab is completely isolated from the cover plate, even if there is an error during assembly, the battery cell and the cover plate will not be directly opposite due to the slight displacement of the first insulating part between the first top surface and the cover plate, and the risk of short circuit between the battery cell and the cover plate is avoided.

[0026] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings incorporated in the specification and forming a part of the specification illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0028] Figure 1 is a schematic diagram of an internal structure of a battery according to an exemplary embodiment.

[0029] Figure 2 is Figure 1 is a schematic diagram of a cross section along KK'.

[0030] Figure 3 is Figure 1 is a schematic diagram of a cross section along FF'.

[0031] Figure 4 is a schematic diagram of an internal structure of a battery according to another exemplary embodiment.

[0032] Figure 5 is a schematic diagram of an internal structure of a battery according to another exemplary embodiment.

[0033] Figure 6 is Figure 5 is an enlarged view of B in FIG.

[0034] Figure 7 is Figure 5 is an enlarged view of C in FIG. BRIEF DESCRIPTION OF DRAWINGS

[0036] 1, housing; 11, shell; 12, cover plate; 13, pole column; 131, positive pole column; 132, negative pole column; 14, liquid injection hole; 15, anti-explosion groove; 2, battery cell; 21, first top surface; 22, peripheral side surface; 23, tab; 231, positive tab; 231-a, tab body; 231-b, bridging portion; 232, negative tab; 3, insulation assembly; 31, first insulation portion; 311, through hole; 312, first sealing ring; 32, second insulation portion; 33, third insulation portion; 34, insulation layer; 35, protective layer; 4, sealing member; 41, peg cap; 42, peg column; 43, second sealing ring. DETAILED DESCRIPTION

[0037] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following description is not meant to limit the disclosed embodiments to all the embodiments in which they are consistent with the present disclosure. Rather, they are merely examples in accordance with some aspects of the present disclosure as detailed in the appended claims.

[0038] The present disclosure proposes a battery, comprising a housing, a battery cell and an insulation assembly. The housing comprises an open shell with a containing space and a cover plate covering the opening of the shell; the battery cell is arranged in the containing space of the shell, and the battery cell is provided with a tab facing the first top surface of the cover plate; the insulation assembly is in a cap-shaped structure comprising a first insulation portion and a second insulation portion, the first insulation portion is arranged between the first top surface and the cover plate, and the circumferential edge of the first insulation portion extends towards the battery cell to form the second insulation portion surrounding at least part of the battery cell.

[0039] In the present disclosure, the first insulation portion is arranged between the first top surface and the cover plate of the battery to isolate the battery cell and the cover plate, so as to avoid short circuit between the battery cell and the cover plate. Moreover, the second insulation portion comprising part of the battery cell is arranged, so as to relatively fix the insulation assembly and the battery cell, avoid the complete insulation between the battery cell and the cover plate due to assembly error, and improve the safety of the battery.

[0040] A battery is a device for storing electrical energy, and has the functions of charging and discharging. Such charging and discharging can be one-time or repeated.

[0041] Figure 1 is a schematic diagram of the internal structure of a battery according to an exemplary embodiment, as shown in Figure 1As shown, the battery includes a casing 1, a battery cell 2, and an insulation assembly 3. The casing 1 includes an open housing 11 with a receiving space and a cover plate 12 covering the opening of the housing 11; the battery cell 2 is disposed in the receiving space within the housing 11, and the battery cell 2 has a tab 23 disposed on a first top surface 21 facing the cover plate 12; the insulation assembly 3 is a cap-shaped structure including a first insulating part 31 and a second insulating part 32, the first insulating part 31 is disposed between the first top surface 21 and the cover plate 12, and the circumferential edge of the first insulating part 31 extends toward the battery cell 2 to form a second insulating part 32 that at least partially surrounds the battery cell 2.

[0042] In the embodiments of this disclosure, a first insulating portion 31 is provided between the first top surface 21 of the battery cell 2 and the cover plate 12 of the outer casing 1 to insulate the battery cell 2 from the cover plate 12, thereby preventing short circuits between the battery cell 2 and the cover plate 12. Furthermore, the first insulating portion 31 extends into a second insulating portion 32 that partially encloses the battery cell 2, fixing the first insulating portion 31 relative to the battery cell 2. Structurally, this avoids the risk of short circuits caused by misalignment between the first insulating portion 31 and the battery cell 2 and the cover plate 12, thus improving battery safety.

[0043] In some embodiments, the housing 1 may be made of stainless steel, aluminum, or other rigid materials. Of course, those skilled in the art may also use soft materials as needed, and this disclosure does not limit this.

[0044] Various connection methods can be used between the cover plate 12 and the housing 11, such as laser welding.

[0045] The insulating component 3 can be installed in various ways, such as using a riveting structure to fix the insulating component 3 to the housing 1, or using the housing 1 and the battery cell 2 to clamp the insulating component 3, or other feasible methods. When fixed with rivets, the insulating component 3 is provided with rivet holes for the rivets to pass through.

[0046] Figure 2 yes Figure 1 A schematic diagram of the cross-section along KK', as shown below. Figure 2 As shown, the insulating component 3 includes at least an insulating layer 34 and a protective layer 35 stacked along its own thickness direction, wherein the melting point of the protective layer 35 is lower than the melting point of the insulating layer 34.

[0047] In the embodiments of this disclosure, a protective layer 35 with a melting point lower than that of the insulating layer 34 is provided in the insulating component 3. This protective layer can melt when the temperature of the battery cell 2 rises above a safe value, thereby reducing the total thickness of the insulating component 3. This allows the gas generated by the battery cell 2 to break through the insulating component 3 and escape, preventing the gas from being trapped inside the insulating component 3 and causing a high-pressure explosion. There are various ways in which the gas can break through the insulating component 3, such as the gas puncturing the insulating layer 34.

[0048] The insulation layer 34 can be made of various materials, such as one or more of epoxy resin, polytetrafluoroethylene resin, alumina ceramic, polyaryletherketone, polyether ether ketone, acrylic resin, polyurethane, polyvinyl alcohol, polybutyl acrylate, polyacrylonitrile, and polyvinyl pyrrolidone.

[0049] The protective layer 35 can be made of materials with different melting points according to requirements, and the melting point of the protective layer 35 is generally 80-130°C. The protective layer 35 is also made of insulating materials.

[0050] In some embodiments, as shown in FIG. 1, the protective layer 35 is arranged on the side of the insulation layer 34 facing the battery cell 2. Figure 2

[0051] In the embodiments of the present disclosure, the heat of the battery is generated from the battery cell 2, and the protective layer 35 is arranged on the side facing the battery cell 2, so that the protective layer 35 will be exposed to the temperature rise of the battery before the insulation layer 34, and it is more convenient to absorb the heat of the battery to melt quickly. Moreover, after the protective layer 35 melts, a gap is formed between the insulation layer 34 and the battery cell 2, which is conducive to the discharge of the gas generated by the battery.

[0052] In some embodiments, as shown in FIG. 1, the thickness of the insulation assembly 3 is T1, and the thickness of the protective layer 35 is T2. The relationship between the thickness T1 of the insulation assembly 3 and the thickness T2 of the protective layer 35 satisfies 0.05≤T2 / T1≤0.6. Figure 2

[0053] In the embodiments of the present disclosure, the insulation assembly 3 is arranged according to the ratio of 0.05≤T2 / T1≤0.6, which can not only meet the insulation requirements, but also make the insulation layer 34 thin enough to facilitate the discharge of the gas generated by the battery cell 2 after the functional layer melts.

[0054] In some embodiments, the thickness T1 of the insulation assembly 3 is 0.5mm≤T1≤3mm. The thickness T2 of the functional layer is 0.25mm≤T2≤1.5mm. The thickness T3 of the insulation layer 34 is 0.25mm≤T3≤1.5mm.

[0055] In some embodiments, the relationship between the thickness T1 of the insulation assembly 3 and the thickness T2 of the protective layer 35 satisfies 0.1≤T2 / T1≤0.5.

[0056] In some embodiments, the strength of the insulation assembly 3 is 0.4-2 megapascals, and after the protective layer 35 melts, the strength of the insulation assembly 3 is 0.1-0.5 megapascals.

[0057] In some embodiments, the insulation layer 34 can also be arranged as a multi-layer structure according to requirements.

[0058] In some embodiments, the insulation layer 34 can also be arranged as a multi-layer structure according to requirements.​Figure 3 yes Figure 1 A schematic diagram of the cross-section along FF'. (See diagram below.) Figure 3 As shown, the battery cell 2 includes a peripheral side surface 22 connected to the first top surface 21; the second insulating portion 32 is parallel to the peripheral side surface 22 in its own extending direction.

[0059] In the embodiments of this disclosure, the second insulating part 32 is arranged parallel to the peripheral side surface 22 of the battery cell 2, so that the second insulating part 32 can be better fixed with the battery cell 2 and avoid misalignment or slippage during installation.

[0060] In some embodiments, the second insulating portion 32 is provided to extend from the side of the first insulating portion 31 toward the cell 2.

[0061] In the embodiments of this disclosure, the second insulating portion 32 is configured to expand toward the battery cell 2, which facilitates the assembly of the battery cell 2 with the second insulating portion 32 and avoids damage to the battery cell 2 during installation.

[0062] In some embodiments, such as Figure 3 As shown, the second insulating portion 32 extends from the first insulating portion 31 toward the cell 2, and the angle between the second insulating portion 32 and the peripheral side surface 22 is less than or equal to an angle threshold.

[0063] In the embodiments of this disclosure, an upper limit is set for the angle between the second insulating part 32 and the peripheral side surface 22 of the battery cell 2, which can prevent damage to the battery cell 2 or scratching against the inner wall of the outer casing 1 due to an excessively large angle between the second insulating part 32 and the peripheral side surface 22 of the battery cell 2.

[0064] like Figure 3 As shown, R is the angle between the second insulating part 32 and the peripheral side surface 22 of the battery cell 2. In some embodiments, the angle threshold can be set to 15°, that is, the angle R can be: 0°≤R≤15°.

[0065] In some embodiments, such as Figure 3 As shown, the second insulating portion 32 at least partially overlaps with the battery cell 2 in its own extending direction, and the overlap length L satisfies: the first length threshold ≤ L ≤ the second length threshold, the first length threshold is less than the second length threshold, and the first length threshold and the second length threshold satisfy that the second insulating portion 32 has the ability to constrain the battery cell 2 in a direction perpendicular to its own extending direction.

[0066] In the embodiments of this disclosure, a range is set for the overlap length of the second insulating part 32 and the battery cell 2, so that the second insulating part 32 can both fix the battery cell 2 and avoid occupying too much space.

[0067] In some embodiments, the first length threshold may be 1 mm and the second length threshold may be 5 mm, that is, the overlapping length satisfies: 1 mm ≤ L ≤ 5 mm.

[0068] In some embodiments, the gap between the first insulating part 31 and the cover plate 12 is less than or equal to 1 mm.

[0069] In some embodiments, the cover plate 12 is a rectangle with unequal length and width, and the first insulating part 31 is also a rectangle with unequal length and width. The first insulating part 31 is 1 mm to 3 mm shorter than the cover plate 12 in length, and 0.2 mm to 1 mm shorter than the cover plate 12 in width.

[0070] Figure 4 This is a schematic diagram of the internal structure of a battery according to another exemplary embodiment, such as... Figure 4 As shown, the cover plate 12 is provided with a pole post 13, and the first insulating part 31 has a through hole 311 for the pole tab 23 to pass through. The insulating assembly 3 also includes a third insulating part 33 disposed between the first insulating part 31 and the cover plate 12. The third insulating part 33 is disposed on the line connecting the pole post 13 and the through hole 311, and the pole tab 23 connected to the pole post 13 is wrapped around the side of the third insulating part 33.

[0071] In the embodiments of this disclosure, a third insulating part 33 is provided between the first insulating part 31 and the cover plate 12, and the electrode tab 23 is configured to bypass the third insulating part 33 and connect to the electrode post 13, so that the electrode tab 23 has a bent structure, which increases the reliability of the electrode tab 23 and further avoids the risk of short circuit.

[0072] In some embodiments, the third insulating portion 33 may be made of a variety of insulating materials, such as soluble polytetrafluoroethylene (PFA).

[0073] "The cover plate 12 is provided with the terminal post 13" is a way of describing the battery structure. It does not mean that the terminal post 13 and the cover plate 12 necessarily have a structural dependence or subordinate relationship. The terminal post 13 can be set as an integral part of the cover plate 12 or set separately.

[0074] In some embodiments, such as Figure 4 As shown, a first sealing ring 312 is provided around the pole post 13 to seal and fix the pole post 13 to the through hole 311 of the first insulating part 31, so as to enhance the protection of the battery cell 2.

[0075] In some embodiments, such as Figure 4 As shown, the terminal post 13 includes at least a positive terminal post 131, and the electrode tab 23 includes at least a positive electrode tab 231. The positive electrode tab 231 includes an electrode tab body 231-a and a bridging part 231-b. The battery cell 2, the electrode tab body 231-a and the bridging part 231-b are connected in sequence. The bridging part 231-b is made of a different material than the electrode tab body 231-a.

[0076] The tab body 231-a is located between the battery cell 2 and the third insulation part 33, and the bridging part 231-b is wrapped around the third insulation part 33 side and connected with the positive pole 131.

[0077] In the embodiments of the present disclosure, the bridging part 231-b is arranged in the positive tab 231 to avoid electrochemical corrosion of the positive tab 231 and prolong the service life of the battery.

[0078] In some embodiments, the bridging part 231-b can be made of aluminum material.

[0079] In some embodiments, the distance between the tab body 231-a and the cover plate 12 is greater than or equal to a first distance threshold, and the first distance threshold satisfies the insulation between the tab body 231-a and the cover plate 12.

[0080] The first distance threshold can be 0.5 mm.

[0081] In the embodiments of the present disclosure, the distance between the tab body 231-a and the cover plate 12 is set to be greater than or equal to the first distance threshold, which can avoid short circuit between the tab body 231-a and the cover plate 12 due to too close distance.

[0082] The cover plate 12 of the battery is also provided with a negative pole 132, which respectively outputs negative current and positive current with the positive pole 131.

[0083] The first top surface 21 of the battery cell 2 is also provided with a negative tab 232, which is directly connected with the negative pole 132 to output the current of the battery cell 2 to the negative pole 132.

[0084] Figure 5 is a battery internal structure schematic diagram according to another exemplary embodiment, Figure 6 is Figure 5 the enlarged view at B in FIG. 8A, as Figure 5 , Figure 6 As shown in FIG. 8A, the shell 1 is provided with a liquid injection hole 14 which communicates inside and outside of the shell 1, and the relationship between the number N of the liquid injection hole 14 and the capacity A of the battery cell satisfies: 0.4≤A / n≤1.1, wherein the unit of the capacity A of the battery cell is Ah.

[0085] In the embodiments of the present disclosure, the number of the liquid injection hole 14 is set according to the proportional relationship of 0.4≤A / n≤1.1, which can not only improve the liquid injection efficiency and the immersion effect of the battery cell 2, thereby changing the cycle performance of the battery, but also avoid too many liquid injection holes 14 from affecting the strength of the shell 1.

[0086] In some embodiments, the relationship between the number N of the liquid injection hole 14 and the capacity A of the battery cell satisfies: 0.5≤A / n≤1, wherein the unit of the capacity A of the battery cell is Ah.

[0087] In some embodiments, as shown in Figure 5 the number of injection holes 14 opened on the cover plate 12 is less than or equal to the first number threshold.

[0088] In embodiments of the present disclosure, the cover plate 12 is located at the end of the battery, and the injection liquid is injected into the injection holes 14 opened on the cover plate 12, which is difficult to flow to the entire battery cell 2. By setting an upper limit for the number of injection holes 14 on the cover plate 12, the utilization efficiency of the injection holes 14 can be improved under the condition that the total number of injection holes 14 is constant.

[0089] In some embodiments, the first number threshold can be 2.

[0090] Figure 5 、 Figure 6 In the above embodiment, only one injection hole 14 is provided on the cover plate 12, but it is not limited thereto.

[0091] In some embodiments, the battery cell capacity A can be set to 1 Ah-8 Ah, and the total number of injection holes 14 can be set to 1-5.

[0092] In some embodiments, the battery liquid is injected in multiple times. For example, the battery liquid can be injected in two times, the first injection is 40%-70% of the total injection amount, and the second injection is the remaining 30%-60%.

[0093] In some embodiments, the injection amount of each injection hole 14 is equal, which can improve the infiltration effect and make the infiltration more balanced, and avoid the situation that some injection holes 14 overflow.

[0094] The injection hole 14 can be circular, rhombic, square or columnar, etc. The columnar injection hole 14 is provided with a connecting hole.

[0095] In some embodiments, as shown in Figure 5 、 Figure 6 the battery further comprises a sealing member 4 for sealing the injection hole 14, the sealing member 4 comprises a nail cap 41 and a nail column 42 connected with the nail cap 41, and the sealing member 4 further comprises a second sealing ring 43. The second sealing ring 43 can be provided at the connection between the nail column 42 and the nail cap 41, or only provided at the nail column 42 or only provided at the nail cap 41. Figure 6 In the above embodiment, the second sealing ring 43 is provided at the connection between the nail column 42 and the nail cap 41.

[0096] The cross section of the nail column 42 can be circular, square or rhombic, the cross section radius of the nail column 42 gradually decreases from the end close to the nail cap 41 to the end away from the nail cap 41, and the cross section radius of the nail column 42 is not greater than the radius of the injection hole 14, so as to facilitate the insertion of the nail column 42 into the injection hole 14 to seal the injection hole 14.

[0097] The nail post 42 can be made of metal and is welded to the outer casing 1. The nail head 41 is made of one or more of polyurethane elastomers, acrylic elastomers, vinyl elastomers, and butene elastomers.

[0098] In the embodiments disclosed herein, the filling hole 14 is sealed by the sealing element 4 to prevent battery fluid leakage, and the structure is simple, easy to manufacture and use.

[0099] Figure 7 yes Figure 5 Enlarged view of point C, as shown Figure 5 , Figure 7 As shown, the outer casing 1 is provided with an explosion-proof groove 15, the depth of the explosion-proof groove 15 is H, and the thickness of the outer casing 1 is D. The depth H of the explosion-proof groove 15 and the thickness D of the outer casing 1 satisfy: 5% ≤ H / D ≤ 60%.

[0100] In the embodiments of this disclosure, by creating an explosion-proof groove 15 in the outer casing 1, the explosion-proof groove 15 can bulge outward to achieve a pressure reduction effect when the battery overheats and generates gas. By setting the depth of the explosion-proof groove 15 as described in the embodiments of this disclosure, it is possible to avoid the bottom wall of the explosion-proof groove 15 being too thin and cracked by gas expansion, while also preventing the bottom wall of the explosion-proof groove 15 from being too thick and unable to be expanded and deformed by gas.

[0101] In some embodiments, the depth H of the explosion-proof groove 15 and the thickness D of the outer shell 1 can also satisfy: 10% ≤ H / D ≤ 50%.

[0102] In some embodiments, the opening of the explosion-proof groove 15 can be configured as one of the following structures: circular, semi-circular, square, rhomboid, elliptical, etc. When there are multiple explosion-proof grooves 15, the openings of the explosion-proof grooves 15 can also have different shapes.

[0103] In some embodiments, the opening of the explosion-proof groove 15 is set to 0.5mm to 3mm.

[0104] In some embodiments, the number of explosion-proof grooves 15 can be set to a minimum of 1 and a maximum of 5. Figure 7 The example shown illustrates a case where an explosion-proof groove 15 is provided on the housing 11, but it is not limited to this.

[0105] The explosion-proof groove 15 can be processed in a variety of ways, such as using laser processing.

[0106] Figure 7 The diagram shows an explosion-proof groove 15 disposed on the outer surface of the housing 1, but the explosion-proof groove 15 may also be disposed on the inner surface of the housing 1. When there are multiple explosion-proof grooves 15, some explosion-proof grooves 15 may be formed on the inner surface of the housing 1, and other explosion-proof grooves 15 may be formed on the inner surface of the housing 1. This disclosure does not limit this.

[0107] The battery of the present disclosure proposes to set an insulation assembly 3 between the shell 1 and the battery cell 2, and to fix the first insulation part 31 relative to the battery cell 2 through the second insulation part 32 of the insulation assembly 3, so that the first insulation part 31 cannot be dislocated relative to each other, and even if there is an error in the assembly process, the first insulation part 31 and the second insulation part 32 can wrap the first end of the first top surface 21 of the battery cell 2, and realize complete insulation with the cover plate 12. Avoid short circuit between the battery cell 2 and the cover plate 12, and improve the safety of the battery.

[0108] And the insulation assembly 3 is equipped with a double-layer structure including an insulation layer 34 and a protective layer 35, and when the battery is overheated, the protective layer 35 with a lower melting point will melt first, so that the gas generated by the battery cell 2 can flow out of the insulation assembly 3, avoiding the risk of high-pressure explosion.

[0109] The present disclosure also proposes a terminal device including the battery in the embodiments of the present disclosure.

[0110] In the embodiments of the present disclosure, by setting the insulation assembly 3 wrapping the end of the battery cell 2 in the battery, the short circuit between the battery cell 2 and the cover plate 12 of the shell 1 is avoided, the safety of the battery is improved, and the safety of the terminal device is improved.

[0111] The terminal device refers to a device that needs or can use a battery, such as a mobile phone, a car, a mobile power supply, etc.

[0112] It can be understood that in the present disclosure, “multiple” refers to two or more, and other quantifiers are similar. “And / or” describes the association between the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, and B exists alone. The character “ / ” generally represents that the associated objects before and after are in an “or” relationship. The singular form “a”, “said” and “the” are also intended to include the plural form, unless the context clearly indicates otherwise.

[0113] It can be further understood that the terms “first”, “second”, etc. are used to describe various information, but these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not represent a specific order or importance. In fact, the expressions “first”, “second”, etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0114] It will be further understood that the terms "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate orientations or positions on the drawings as specified and are for convenience only in describing the application and its embodiments, and do not indicate or imply necessary or required orientations of the device or element thereof, or mandatory or preferred orientations of the application or its embodiments.

[0115] It will be further understood that, unless otherwise specified, "connected" includes both direct and indirect connection.

[0116] It will be further understood that, unless otherwise specified, "connected" includes both direct and indirect connection.

[0117] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present disclosure cover any and all variations of the application that come within the scope of the following claims and their equivalents. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0118] It is to be understood that the application is not limited to the precise construction described and as shown in the attached drawings, and that various modifications and changes can be effected therein by those skilled in the art without departing from the scope of the application. The scope of the application is to be limited only by the appended claims.

Claims

1. A battery, characterized by, Comprising A housing comprising an open shell having a containing space and a cover plate arranged on the opening of the shell; An electric core arranged in the containing space of the shell, the electric core being provided with a tab towards a first top surface of the cover plate; An insulation assembly, the insulation assembly being a cap-shaped structure comprising a first insulation part and a second insulation part, the first insulation part being arranged between the first top surface and the cover plate, a circumferential edge of the first insulation part extending towards the electric core to form the second insulation part at least partially surrounding the electric core.

2. The battery of claim 1, wherein, The insulation assembly comprises at least an insulation layer and a protective layer arranged in a stacked manner along the thickness direction of the insulation assembly, the melting point of the protective layer being lower than the melting point of the insulation layer.

3. The battery of claim 2, wherein, The protective layer is arranged on the side of the insulation layer facing the electric core.

4. The battery according to claim 2 or 3, characterized in that, The thickness of the insulation assembly is T1, the thickness of the protective layer is T2, and the relationship between the thickness T1 of the insulation assembly and the thickness T2 of the protective layer satisfies 0.05≤T2 / T1≤0.

6.

5. The battery of any one of claims 1-3, wherein, The electric core comprises a peripheral side surface connected to the first top surface; The second insulation part is parallel to the peripheral side surface in the extension direction of the second insulation part; or The second insulation part is arranged in an expanding manner from one side of the first insulation part towards the electric core.

6. The battery of claim 5, wherein, The second insulation part is arranged in an expanding manner from one side of the first insulation part towards the electric core, and the included angle between the second insulation part and the peripheral side surface is less than or equal to an angle threshold.

7. The battery of any one of claims 1-3, wherein, The second insulation part at least partially coincides with the electric core in the extension direction of the second insulation part, and the coinciding length L satisfies a first length threshold value≤L≤a second length threshold value, the first length threshold value being less than the second length threshold value, and the first length threshold value and the second length threshold value satisfy that the second insulation part has the ability to constrain the electric core in a direction perpendicular to the extension direction of the second insulation part.

8. The battery of any one of claims 1-3, wherein, The cover plate is provided with a pole, the first insulation part is provided with a through hole for the tab to pass through, and the insulation assembly further comprises a third insulation part arranged between the first insulation part and the cover plate, the third insulation part being arranged on the line connecting the pole and the through hole, and the tab connected to the pole is connected around the side of the third insulation part.

9. The battery of claim 8, wherein, The pole comprises at least a positive pole, and the tab comprises at least a positive tab, the positive tab comprising a tab body and a bridging part, the electric core, the tab body and the bridging part being connected in sequence, and the material of the bridging part is different from that of the tab body. The tab body is located between the electric core and the third insulation part, and the bridging part is connected around the side of the third insulation part and connected to the positive pole.

10. The battery of claim 9, wherein, The distance between the tab body and the cover plate is greater than or equal to a first distance threshold value, and the first distance threshold value satisfies that the tab body is insulated from the cover plate.

11. The battery of any one of claims 1-3, wherein, The housing is provided with a liquid injection hole communicating between the inside and the outside of the housing, and the relationship between the number N of the liquid injection hole and the capacity A of the electric core satisfies 0.4≤A / n≤1.1, wherein the unit of the capacity A of the electric core is Ah.

12. The battery of claim 11, wherein, The number of the liquid injection hole arranged on the cover plate is less than or equal to a first number threshold value.

13. The battery of any one of claims 1-3, wherein, The shell is provided with an explosion-proof groove, the depth of the explosion-proof groove is H, the thickness of the shell is D, and the depth H of the explosion-proof groove and the thickness D of the shell satisfy: 5%≤H / D≤60%.

14. A terminal device, comprising: A battery comprising the battery of any one of claims 1-13.

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