Battery and battery module

Abstract

The utility model provides a battery and a battery module, and relates to the technical field of new energy technology, the battery comprises a battery cell shell, a battery cell assembly and a top cover assembly, a lower gasket is arranged in the battery cell shell, and the lower gasket is arranged at the lower end of the battery cell assembly; a plurality of first guide grooves are formed in the upper end face of the lower gasket, and the first guide grooves penetrate through the upper end face of the lower gasket. A lower gasket is arranged in a battery cell shell of the battery provided by the utility model, and a first guide groove is formed in the lower gasket; after the battery cell assembly generates gas, the gas can enter the first guide groove through the infiltration holes and flow to the edge of the battery cell shell along the first guide groove, so that gas diffusion is realized, the gas diffusion efficiency is improved, and the gas is prevented from being gathered at the bottom of the battery cell shell to cause explosion and fire of the battery.

Description

Technical Field

[0001] This utility model relates to the technical field of new energy technologies, and in particular to a battery and a battery module. Background Technology

[0002] The battery consists of a top cover, bare cells, insulating sheets, and an aluminum casing. To prevent short circuits caused by contact between the bare cells and the aluminum casing within the square cells, the bare cells need to be physically isolated from the aluminum casing to achieve insulation.

[0003] The bare battery cell is directly wrapped with an insulating sheet to physically isolate it from the aluminum casing. However, in order not to affect the electrolyte wetting of the bare battery cell, wetting holes are provided on the insulating sheet. The insulating sheet is placed in close contact with the aluminum casing, which means that when the battery cell assembly generates gas, the gas cannot diffuse downwards. At the same time, the gas generated by the battery cell assembly at the bottom is hindered from diffusing to the surrounding area due to the bare battery cell itself and the insulating sheet. The diffusion efficiency is low, which reduces the reliability of the battery in the event of thermal runaway or short circuit, and poses a risk of explosion and fire. Utility Model Content

[0004] The purpose of this invention is to provide a battery and a battery module to alleviate the technical problem that when the insulating sheet of the battery cell assembly is tightly attached to the casing, the gas generated by the battery cell assembly cannot diffuse downward in a timely manner.

[0005] This utility model provides a battery, including a cell housing, a cell assembly, and a top cover assembly; the cell housing has an upper opening, and the cell assembly is assembled into the cell housing through the upper opening;

[0006] The top cover assembly is assembled at the upper opening; an insulating sheet is wrapped around the cell assembly, and multiple wetting holes are provided on the insulating sheet, with the wetting holes located at the lower end of the cell assembly;

[0007] A lower gasket is provided inside the cell housing and is located at the lower end of the cell assembly; a plurality of first guide grooves are provided on the upper end surface of the lower gasket and the first guide grooves penetrate the upper end surface of the lower gasket.

[0008] In an optional embodiment, a plurality of first guide grooves are arranged sequentially along the width direction of the lower pad, and an upper support protrusion is formed between two adjacent first guide grooves. The upper support protrusion is used to abut against the battery cell assembly, and the wetting hole on the insulating sheet corresponds to the first guide groove.

[0009] In an optional embodiment, the lower pad is provided with a plurality of second guide grooves, which are arranged sequentially along the length direction of the lower pad.

[0010] In an optional embodiment, the lower gasket is provided with a lower guide groove, and a plurality of lower guide grooves are arranged sequentially along the width direction of the lower gasket, and a lower support protrusion is formed between two adjacent lower guide grooves; the lower support protrusion is used to abut against the battery cell housing.

[0011] In an optional embodiment, the lower support protrusion is disposed corresponding to the first guide groove, and the lower guide groove is disposed corresponding to the upper support protrusion.

[0012] In an optional embodiment, the plurality of wetting holes are arranged in multiple rows and columns, with each row of wetting holes corresponding to one of the first guide grooves and each column of wetting holes corresponding to one of the second guide grooves.

[0013] In an optional implementation, the cell assembly includes two cells.

[0014] In an optional embodiment, the battery is a square-core battery.

[0015] In an optional embodiment, the insulating sheet is made of PP or PET.

[0016] The battery provided by this utility model has a lower gasket inside the cell housing, and a first guide groove is provided on the lower gasket. After the cell assembly generates gas, the gas can enter the first guide groove through the wetting hole and flow along the first guide groove to the edge of the cell housing, thereby realizing gas diffusion, improving gas diffusion efficiency, and preventing gas from accumulating at the bottom of the cell housing, which could cause the battery to explode or catch fire.

[0017] This utility model provides a battery module, including the battery described in any one of the foregoing embodiments.

[0018] Compared with the prior art, the battery module provided by this utility model has the battery provided by this utility model, and thus has all the beneficial effects of the battery provided by this utility model. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the battery structure provided in an embodiment of this utility model;

[0021] Figure 2 for Figure 1A schematic diagram of the insulating sheet of the battery shown;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure of the lower pad of the battery is shown.

[0023] Figure 4 for Figure 1 A schematic diagram of another structure of the lower pad of the battery shown;

[0024] Figure 5 for Figure 1 The diagram shows another structural schematic of the lower pad of the battery.

[0025] Figure 6 for Figure 5 A magnified view of part A of the lower pad shown;

[0026] Figure 7 for Figure 1 The diagram shows a cross-sectional view of the battery.

[0027] Figure 8 for Figure 7 The diagram shows a partial enlarged view of section B in the longitudinal cross-section of the battery.

[0028] Icons: 100-Cell housing; 101-Upper opening; 200-Top cover assembly; 300-Cell assembly; 301-Insulating sheet; 302-Immersion hole; 400-Lower gasket; 401-First guide groove; 402-Upper support protrusion; 403-Second guide groove; 404-Lower guide groove; 405-Lower support protrusion. Detailed Implementation

[0029] The terms “first,” “second,” “third,” etc., are used only for distinguishing descriptions and do not indicate a sequence number, nor should they be interpreted as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should be noted that the terms "inner", "outer", "left", "right", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] In the description of this application, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” shall be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components.

[0033] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings.

[0034] Example

[0035] Reference Figures 1-8 The present invention provides a battery, including a cell housing 100, a cell assembly 300 and a top cover assembly 200; the cell housing 100 has an upper opening 101, and the cell assembly 300 is assembled into the cell housing 100 through the upper opening 101;

[0036] The top cover assembly 200 is assembled at the upper opening 101; an insulating sheet 301 is wrapped around the cell assembly 300, and a plurality of wetting holes 302 are provided on the insulating sheet 301, and the wetting holes 302 are located at the lower end of the cell assembly 300.

[0037] A lower gasket 400 is provided inside the cell housing 100, and the lower gasket 400 is located at the lower end of the cell assembly 300; a plurality of first guide grooves 401 are provided on the upper end surface of the lower gasket 400, and the first guide grooves 401 penetrate through the upper end surface of the lower gasket 400.

[0038] In some embodiments, the battery cell housing 100 has an upper opening 101, and the cell assembly 300 is assembled inside the cell housing 100 through the upper opening 101; a lower gasket 400 is provided at the bottom of the cell housing 100, and a plurality of first guide grooves 401 are provided on the lower gasket 400; an insulating sheet 301 is wrapped around the cell assembly 300, thereby achieving physical isolation between the cell assembly 300 and the cell housing 100; in order to prevent the insulating sheet 301 from affecting the wetting of the electrolyte, a plurality of wetting holes 302 are provided at the lower end of the insulating sheet 301, through which the electrolyte can enter into the cell assembly 300.

[0039] When the cell assembly 300 generates gas, the gas can only flow upward or downward because the cell assembly 300 is wrapped with an insulating sheet 301. In order to allow the gas flowing in from the wetting hole 302 to flow smoothly, the wetting hole 302 is correspondingly provided with the first guide groove 401. The first guide groove 401 penetrates the upper end face of the lower gasket 400. The gas entering the first guide groove 401 from the wetting hole 302 can extend the first guide groove 401 to flow to the gap between the cell housing 100 and the cell assembly 300 and flow upward along the gap. This effectively dissipates the gas generated at the bottom of the cell housing 100, enhances the gas dissipation efficiency, and prevents the gas from accumulating at the bottom of the battery, which could cause the battery to explode or catch fire.

[0040] Reference Figure 3 In an optional embodiment, a plurality of first guide grooves 401 are arranged sequentially along the width direction of the lower pad 400, and an upper support protrusion 402 is formed between two adjacent first guide grooves 401. The upper support protrusion 402 is used to abut against the battery cell assembly 300, and the wetting hole 302 on the insulating sheet 301 corresponds to the first guide groove 401.

[0041] In some embodiments, a plurality of first guide grooves 401 are arranged sequentially along the width direction of the lower pad 400, and an upper support protrusion 402 formed between two adjacent first guide grooves 401 is used to abut against the lower end of the cell assembly 300; the upper support protrusion 402 can support the cell assembly 300, and the wetting hole 302 on the insulating sheet 301 on the cell assembly 300 corresponds to the first guide groove 401; the electrolyte can flow through the first guide groove 401 to the wetting hole 302, thereby improving the wetting efficiency of the electrolyte on the cell assembly 300. When the cell assembly 300 generates gas, the gas can also flow from the wetting hole 302 into the first guide groove 401 and move along the first guide groove 401 to the edge of the cell housing 100, which is conducive to the rapid dissipation of gas.

[0042] Reference Figure 4 In an optional embodiment, the lower pad 400 is provided with a plurality of second guide grooves 403, which are arranged sequentially along the length direction of the lower pad 400.

[0043] To further improve the gas dispersion efficiency, a plurality of second guide grooves 403 are provided on the lower gasket 400. Since the first guide grooves 401 are arranged sequentially along the width direction of the lower gasket 400, and the second guide grooves 403 are arranged sequentially along the length direction of the lower gasket 400, the first guide grooves 401 and the second guide grooves 403 intersect, and the gas flowing out of the wetting hole 302 can flow into the first guide grooves 401 and the second guide grooves 403. The first guide grooves 401 and the second guide grooves 403 cooperate to diffuse the gas in all directions, further improving the gas dispersion efficiency.

[0044] Reference Figure 5 and Figure 6 In an optional embodiment, the lower gasket 400 is provided with a lower guide groove 404, and a plurality of lower guide grooves 404 are arranged sequentially along the width direction of the lower gasket 400, and a lower support protrusion 405 is formed between two adjacent lower guide grooves 404; the lower support protrusion 405 is used to abut against the battery cell housing 100.

[0045] In an optional embodiment, the lower support protrusion 405 is correspondingly disposed with the first guide groove 401, and the lower guide groove 404 is correspondingly disposed with the upper support protrusion 402.

[0046] In some embodiments, a plurality of lower guide grooves 404 are provided on the lower end surface of the lower pad 400, and the lower guide grooves 404 are staggered with the first guide groove 401; a lower support protrusion 405 is provided on the lower end surface of the lower pad 400 and corresponds to the first guide groove 401; the lower support protrusion 405 and the lower guide groove 404 make the lower end of the lower pad 400 form a wave-shaped structure, which not only plays a supporting role, but also has a certain elastic force; when the battery vibrates or collides, it can play a certain buffering role for the cell assembly 300.

[0047] In an optional embodiment, the plurality of wetting holes 302 are arranged in multiple rows and columns, with each row of wetting holes 302 corresponding to one of the first guide grooves 401 and each column of wetting holes 302 corresponding to one of the second guide grooves 403.

[0048] Multiple wetting holes 302 are arranged in multiple rows and columns. The extension direction of the first guide groove 401 is consistent with the row direction of the wetting holes 302, and the extension direction of the second guide groove 403 is consistent with the column direction of the wetting holes 302; this can further improve the gas dispersion efficiency.

[0049] In an optional embodiment, the cell assembly 300 includes two cells.

[0050] In an optional embodiment, the battery is a square-core battery.

[0051] In an optional embodiment, the insulating sheet 301 is made of PP or PET.

[0052] In some embodiments, the cell assembly 300 includes two square cells, the battery is a square battery, the insulating sheet 301 is made of PP or PET, and the lower gasket 400 is also made of insulating material; the lower gasket 400 physically isolates the cell assembly 300 from the cell housing 100, and the impregnation hole 302 also prevents the cell assembly 300 and the cell housing 100 from being connected.

[0053] The battery cell housing 100 provided by this utility model is provided with a lower gasket 400, and a first guide groove 401 is provided on the lower gasket 400. After the cell assembly 300 generates gas, the gas can enter the first guide groove 401 through the wetting hole 302 and flow along the first guide groove 401 to the edge of the cell housing 100, thereby realizing gas diffusion, improving gas diffusion efficiency, and preventing gas from accumulating at the bottom of the cell housing 100, which could cause the battery to explode or catch fire.

[0054] This utility model provides a battery module, including the battery described in any one of the foregoing embodiments.

[0055] Compared with the prior art, the battery module provided by this utility model has the battery provided by this utility model, and thus has all the beneficial effects of the battery provided by this utility model.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery, characterized in that, It includes a cell housing (100), a cell assembly (300), and a top cover assembly (200); the cell housing (100) has an upper opening (101), and the cell assembly (300) is assembled into the cell housing (100) through the upper opening (101); The top cover assembly (200) is assembled at the upper opening (101); an insulating sheet (301) is wrapped around the cell assembly (300), and a plurality of wetting holes (302) are provided on the insulating sheet (301), and the wetting holes (302) are located at the lower end of the cell assembly (300); A lower gasket (400) is provided inside the cell housing (100), and the lower gasket (400) is located at the lower end of the cell assembly (300); a plurality of first guide grooves (401) are provided on the upper end surface of the lower gasket (400), and the first guide grooves (401) penetrate through the upper end surface of the lower gasket (400).

2. The battery according to claim 1, characterized in that, Multiple first guide grooves (401) are arranged sequentially along the width direction of the lower pad (400), and an upper support protrusion (402) is formed between two adjacent first guide grooves (401). The upper support protrusion (402) is used to abut against the battery cell assembly (300), and the wetting hole (302) on the insulating sheet (301) corresponds to the first guide groove (401).

3. The battery according to claim 1 or 2, characterized in that, The lower gasket (400) is provided with a plurality of second guide grooves (403), which are arranged sequentially along the length direction of the lower gasket (400).

4. The battery according to claim 2, characterized in that, The lower gasket (400) is provided with a lower guide groove (404), and a plurality of lower guide grooves (404) are arranged sequentially along the width direction of the lower gasket (400). A lower support protrusion (405) is formed between two adjacent lower guide grooves (404); the lower support protrusion (405) is used to abut against the battery cell housing (100).

5. The battery according to claim 4, characterized in that, The lower support protrusion (405) is correspondingly provided with the first guide groove (401), and the lower guide groove (404) is correspondingly provided with the upper support protrusion (402).

6. The battery according to claim 3, characterized in that, The plurality of wetting holes (302) are arranged in multiple rows and columns, each row of the wetting holes (302) corresponds to one of the first guide grooves (401), and each column of the wetting holes (302) corresponds to one of the second guide grooves (403).

7. The battery according to claim 1, characterized in that, The battery cell assembly (300) includes two battery cells.

8. The battery according to claim 1, characterized in that, The battery is a square-core battery.

9. The battery according to claim 1, characterized in that, The insulating sheet (301) is made of PP or PET.

10. A battery module, characterized in that, Includes the battery as described in any one of claims 1-9.

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