Battery module and battery

Abstract

The utility model discloses a battery which comprises a battery shell and a battery cell, the battery cell is placed in the battery shell, a pole is arranged on the battery shell, an anti-explosion hole is formed in one side face of the battery shell, an anti-explosion piece is connected to the position of the anti-explosion hole, and the battery cell is arranged in the battery shell. The explosion-proof hole and the pole are arranged on different surfaces of the battery shell; the explosion-proof sheet is provided with a convex part, the convex part is arranged on the surface, close to the battery cell, of the explosion-proof sheet, the top surface of the convex part protrudes out of the explosion-proof hole, the surface, close to the convex part, of the battery cell is in contact with the top surface of the convex part, and the convex part is provided with a hole or a gap for air flow to pass through. According to the battery disclosed by the utility model, the battery cell is prevented from being in contact with the inner surface of the battery shell to block a gas flow channel of the anti-explosion sheet, and the anti-explosion sheet can be normally opened to release gas and pressure under the condition of thermal runaway of the battery. The utility model further discloses a battery module.

Description

Technical Field

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

[0002] A battery module is an assembly of multiple batteries connected in series or parallel, designed to provide higher voltage and capacity to meet the power requirements of specific applications.

[0003] In the prior art, a battery generally includes a battery casing and a battery cell placed inside the battery casing. The battery casing is used to house the battery cell and isolate it from the outside environment. The battery cell includes stacked positive electrode plates, negative electrode plates, and a separator, wherein the separator is located between adjacent positive and negative electrode plates. The battery cell can be a wound battery cell or a stacked battery cell. In a wound battery cell, adjacent positive and negative electrode plates and the separator are an integral structure, while in a stacked battery cell, adjacent positive and / or negative electrode plates are separate structures. The positive electrode plate includes a positive electrode active material, which can be any one or a combination of lithium iron phosphate, lithium nickel cobalt manganese oxide, or lithium manganese iron phosphate. The negative electrode plate includes a negative electrode active material, which can be any one or a combination of artificial graphite, natural graphite, hard carbon, soft carbon, or silicon-based materials.

[0004] The battery casing is equipped with an explosion-proof valve on its top or bottom surface. The explosion-proof valve, also known as an explosion-proof disc, is a thin metal sheet designed to prevent thermal runaway and explosion of the battery. The explosion-proof disc has grooves; when the gas pressure inside the battery casing exceeds a set threshold, the disc opens through these grooves to release gas and pressure, thus preventing an explosion. However, when the explosion-proof disc is located on the bottom surface of the battery casing, the battery cells, placed on the bottom surface, can easily block the disc, preventing airflow from reaching it. This prevents the disc from opening during thermal runaway, thus damaging the battery casing. Utility Model Content

[0005] In view of this, the present invention provides a battery that avoids the contact between the battery cell and the inner surface of the battery casing, which would block the gas flow channel of the explosion-proof sheet. This facilitates the flow of gas inside the battery casing to the explosion-proof sheet, ensuring that the explosion-proof sheet can open normally to release gas and pressure in the event of thermal runaway of the battery.

[0006] This utility model also provides a battery module.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A battery includes a battery casing and a battery cell, the battery cell being placed inside the battery casing, the battery casing having terminals, an explosion-proof hole being provided on one side of the battery casing, an explosion-proof plate being connected to the explosion-proof hole, and the explosion-proof hole and the terminals being located on different surfaces of the battery casing.

[0009] The explosion-proof sheet is provided with a protrusion, which is located on the surface of the explosion-proof sheet near the battery cell. The top surface of the protrusion protrudes from the explosion-proof hole. The surface of the battery cell near the protrusion contacts the top surface of the protrusion. The protrusion is provided with a hole or gap for airflow.

[0010] As can be seen from the above technical solution, the battery provided by this utility model, by providing a protrusion on the surface of the explosion-proof plate near the battery cell, with an explosion-proof hole protruding from the top surface of the protrusion to support the battery cell, can prevent the surface of the battery cell near the explosion-proof plate from blocking the explosion-proof plate position. This ensures that there is a gap between the battery cell and the battery casing surface, preventing the battery cell from contacting the inner surface of the battery casing and blocking the gas flow channel. This facilitates the flow of gas inside the battery casing to the explosion-proof plate, ensuring that the explosion-proof plate can open normally to release gas and pressure in the event of battery thermal runaway. The protrusion is provided with holes or gaps for airflow, preventing the protrusion from blocking the airflow to the explosion-proof plate. The gas between the battery cell and the battery casing flows smoothly to the explosion-proof plate position through the holes or gaps, allowing the explosion-proof plate to quickly open and release gas, preventing the battery from exploding.

[0011] This utility model also provides a battery module, including a plurality of batteries, wherein the batteries are those described above.

[0012] The battery module of this utility model includes the battery described above, and therefore has the advantages of the battery described above, which will not be repeated here. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a structural schematic diagram of a battery from one angle, provided in an embodiment of the present invention.

[0015] Figure 2 This is a structural schematic diagram of the battery from another angle provided in an embodiment of the present invention;

[0016] Figure 3 for Figure 2A cross-sectional view of the AA position in the diagram;

[0017] Figure 4 for Figure 3 A partially enlarged structural diagram of part B in the diagram;

[0018] Figure 5 A schematic diagram of the explosion-proof sheet from one angle provided in an embodiment of this utility model;

[0019] Figure 6 This is a structural schematic diagram of the explosion-proof sheet provided in an embodiment of the present invention from another angle;

[0020] Figure 7 for Figure 6 A cross-sectional view of the CC position in the diagram;

[0021] Figure 8 for Figure 7 A partially enlarged structural diagram of part E in the diagram;

[0022] Figure 9 A partial cross-sectional view of the explosion-proof sheet provided in another embodiment of the present invention;

[0023] Figure 10 for Figure 5 A schematic diagram of the explosion-proof sheet from another angle provided in the embodiment;

[0024] Figure 11 This is a schematic diagram of the structure of a cylindrical column provided in one embodiment of the present invention;

[0025] Figure 12 This is a schematic diagram of the structure of a quadrangular prism provided in one embodiment of the present invention.

[0026] in:

[0027] 1. Battery casing,

[0028] 101. Explosion-proof hole,

[0029] 2. Pole post,

[0030] 3. Battery cells,

[0031] 4. Explosion-proof sheet,

[0032] 401. Diaphragm body; 402. Protrusion; 403. Thinning area; 404. Score; 405. Stamping groove. Detailed Implementation

[0033] This utility model discloses a battery that avoids the contact between the battery cell and the inner surface of the battery casing, which would block the gas flow channel of the explosion-proof sheet. This allows the gas inside the battery casing to flow to the explosion-proof sheet, ensuring that the explosion-proof sheet can open normally to release gas and pressure in the event of thermal runaway of the battery.

[0034] This utility model also discloses a battery module.

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] See Figures 1 to 10 The battery of this utility model includes a battery casing 1 and a battery cell 3. The battery cell 3 is placed inside the battery casing 1. A terminal post 2 is provided on the battery casing 1, and the tabs of the battery cell 3 are connected to the terminal post 2. An explosion-proof hole 101 is provided on one side of the battery casing 1, and an explosion-proof sheet 4 is connected to the explosion-proof hole 101, sealing the explosion-proof hole 101. The explosion-proof hole 101 and the terminal post 2 are located on different surfaces of the battery casing 1. The explosion-proof sheet 4 includes a diaphragm body 401, and a protrusion 402 is provided on the diaphragm body 401 near the battery cell 3. The top surface of the protrusion 402 protrudes from the explosion-proof hole 101, thereby facilitating the support of the battery cell 3. The surface of the battery cell 3 near the protrusion 402 contacts the top surface of the protrusion 402, thus supporting the battery cell 3. The protrusion 402 is provided with a hole or gap for airflow. The hole or gap is provided on the side of the protrusion 402, so that even if the battery cell 3 is pressed on the protrusion 402, it will not affect the flow of gas between the battery cell 3 and the battery casing 1 to the explosion-proof sheet 4.

[0037] To achieve stable support, the protrusion 402 is provided at least along two oppositely arranged edges of the explosion-proof sheet 4.

[0038] The battery of this invention features a protrusion 402 on the surface of the explosion-proof plate 4 near the battery cell 3. The top surface of the protrusion 402 has an explosion-proof hole 101 to support the battery cell 3. This prevents the surface of the battery cell 3 near the explosion-proof plate 4 from blocking its position, ensuring a gap between the battery cell 3 and the battery casing 1. This prevents the battery cell 3 from contacting the inner surface of the battery casing 1 and blocking the gas flow channel, facilitating the flow of gas from inside the battery casing 1 to the explosion-proof plate 4. This ensures that the explosion-proof plate 4 can open normally to release gas and pressure in the event of battery thermal runaway. The protrusion 402 has holes or gaps for airflow, preventing it from obstructing the airflow to the explosion-proof plate 4. Gas between the battery cell 3 and the battery casing 1 flows smoothly through these holes or gaps to the explosion-proof plate 4, allowing it to quickly open and release gas, thus preventing battery explosion.

[0039] In one embodiment, the electrode post 2 and the explosion-proof plate 4 are disposed on two opposite sides of the battery housing 1. Specifically, the electrode post 2 is disposed on the top surface of the battery housing 1, and the explosion-proof plate 4 is disposed on the bottom surface of the battery housing 1. Since the top surface of the protrusion 402 on the explosion-proof plate 4 protrudes from the explosion-proof hole 101, the protrusion 402 supports the bottom surface of the battery cell 3, preventing the battery cell 3 from blocking the explosion-proof plate 4, so that the airflow inside the battery housing 1 can flow smoothly to the position of the explosion-proof plate 4.

[0040] Furthermore, the explosion-proof sheet 4 is provided with a notch 404, which is located at the thinned area 403 on the explosion-proof sheet 4. The notch 404 is set along the groove structure of the explosion-proof sheet 4, near the edge of the thinned area 403. By providing the notch 404, since the strength at the notch 404 is lower, it will break first, thereby controlling the location and manner of the explosion-proof sheet 4 breaking, forming a regular opening, reducing fragmentation, and improving safety performance. In order for the protrusion 402 to still have the function of supporting the battery cell 3 when the explosion-proof sheet 4 is opened, the protrusion 402 is located on the outside of the notch 404, which means the side of the notch 404 close to the hole wall of the explosion-proof hole 101. To improve the reliability of the support, the protrusion 402 is located on the outside of the thinned area 403, which means the side of the thinned area 403 close to the hole wall of the explosion-proof hole 101, that is, the protrusion 402 is not located on the thinned area 403.

[0041] In one embodiment, reference is made to Figures 4 to 10 The notch 404 and the protrusion 402 are disposed on two opposing surfaces of the diaphragm body 401 of the explosion-proof sheet 4. In other embodiments, the notch 404 and the protrusion 402 may also be disposed on the same surface of the diaphragm body 401.

[0042] The protrusion 402 includes several support ribs that protrude from the diaphragm body 401, such as... Figure 5 and Figure 6As shown, multiple support ribs are arranged around the notch 404, and adjacent support ribs are spaced apart by a first distance D1, which is 3-20mm. To ensure the stability of the support, the top surfaces of different support ribs are located in the same plane, which is parallel to the bottom surface of the cell 3. The support ribs can be stamped from the diaphragm body 401, that is, the support ribs and the diaphragm body 401 are an integral structure. During stamping, the diaphragm body 401 has stamping grooves 405 on the opposite surfaces of the support ribs, such as... Figure 8 As shown. Alternatively, the supporting rib and the diaphragm body 401 are separate structures, with the supporting rib welded to the diaphragm body 401, as shown. Figure 9 As shown. In other embodiments, the protrusion 402 includes a plurality of protruding pillars arranged around the outer side of the notch 404. The plurality of protruding pillars are spaced apart by a predetermined distance, which is set according to actual needs and is not limited here. The protruding pillars can be cylindrical, such as... Figure 11 As shown, it can also be a square prism, such as... Figure 12 As shown.

[0043] In one embodiment, such as Figure 6 As shown, the supporting rib includes two oppositely arranged planar ribs and two oppositely arranged arcuate ribs. The planar ribs are arranged along the straight edge of the explosion-proof sheet 4, and the arcuate ribs are arranged along the arcuate edge of the explosion-proof sheet 4.

[0044] To achieve better insulation, an insulating film is wrapped around the outer surface of the battery cell 3. The elastic modulus of the insulating film is 1.5–4.6 GPa. When the insulating film is wrapped around the outer surface of the battery cell 3, since the insulating film is a flexible material, the first distance D1 between two adjacent support ribs is 3–16 mm. The insulating film is made of polyester (PET) or polypropylene (PP). The larger the elastic modulus of the insulating film, the stronger its resistance to deformation when subjected to external force, and the greater the external force and load it can withstand. A larger value can be selected for the first distance D1. Conversely, the smaller the elastic modulus of the insulating film, the easier it is to undergo elastic deformation when subjected to external force, and the smaller the external force and load it can withstand. A smaller value needs to be selected for the first distance D1 to prevent the elastically deformed insulating film from blocking the gap between adjacent support ribs.

[0045] When a base plate is provided between the bottom surface of the battery cell 3 and the battery casing 1, the base plate is placed on the top surface of the protrusion 402, and the battery cell 3 is placed on the top surface of the base plate. With this structure, the base plate and the protrusion 402 support the battery cell 3 at the same time. In this way, even if the heat from the battery thermal runaway melts the base plate, the protrusion 402 can still support the battery cell 3, preventing the battery cell 3 from blocking the explosion-proof hole 101 and ensuring the normal operation of the explosion-proof sheet 4.

[0046] The protrusion 402 and the notch 404 are spaced apart by a second distance D2, such as Figure 8 As shown, the second distance D2 is 3-10mm. When the second distance D2 is set within this range, it not only ensures that the protrusion 402 supports the cell 3 in the event of battery thermal runaway, but also strengthens the edge of the explosion-proof plate 4, preventing deformation of the battery casing 1 from causing inaccurate burst pressure of the explosion-proof plate 4. If the value of the second distance D2 is too small, it will affect the burst pressure of the explosion-proof plate 4; if the value is too large, the strengthening effect on the edge of the explosion-proof plate 4 will be poor.

[0047] To ensure support and maintain battery energy density, the top surface of the protrusion 402 protrudes from the end face of the explosion-proof hole 101 at a third distance D3, which ranges from 0.2 to 3 mm.

[0048] The battery of this invention features a protrusion 402 on the surface of the explosion-proof sheet 4 near the battery cell 3. This protrusion 402 supports the battery cell 3 or a base plate that supports the battery cell 3, ensuring a gap between the battery cell 3 and the inner surface of the battery casing 1. The protrusion 402 also has gaps or openings, allowing for side airflow even when the battery cell 3 is pressed against the top surface of the protrusion 402.

[0049] This utility model also provides a battery module, including a plurality of batteries, wherein the batteries are those described above.

[0050] In the description of this solution, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery, comprising a battery casing and a battery cell, wherein the battery cell is disposed within the battery casing, and the battery casing is provided with terminals, characterized in that, An explosion-proof hole is provided on one side of the battery casing, and an explosion-proof plate is connected to the explosion-proof hole. The explosion-proof hole and the electrode are located on different surfaces of the battery casing. The explosion-proof sheet is provided with a protrusion, which is located on the surface of the explosion-proof sheet near the battery cell. The top surface of the protrusion protrudes from the explosion-proof hole. The surface of the battery cell near the protrusion contacts the top surface of the protrusion. The protrusion is provided with a hole or gap for airflow.

2. The battery according to claim 1, characterized in that, The electrode post and the explosion-proof plate are disposed on two opposite sides of the battery casing.

3. The battery according to claim 1 or 2, characterized in that, The explosion-proof sheet has grooves, and the protrusion is located on the side of the groove near the wall of the explosion-proof hole.

4. The battery according to claim 3, characterized in that, The grooves and the protrusions are provided on two surfaces of the explosion-proof sheet that are opposite to each other.

5. The battery according to claim 3, characterized in that, The protrusion includes a plurality of support ribs, which are arranged around the groove, and adjacent support ribs are spaced apart by a first distance. The first distance is 3 to 20 mm.

6. The battery according to claim 5, characterized in that, The outer surface of the battery cell is covered with an insulating film, the elastic modulus of which is 1.5 to 4.6 GPa, and the first distance is 3 to 16 mm.

7. The battery according to claim 3, characterized in that, The protrusion is spaced apart from the groove by a second distance, which is 3 to 10 mm.

8. The battery according to claim 1, characterized in that, A base plate is provided between the battery cell and the shell wall of the battery housing where the explosion-proof sheet is located. The top surface of the protrusion contacts the bottom surface of the base plate, and the top surface of the base plate contacts the ground of the battery cell. The base plate is used to support the battery cell.

9. The battery according to claim 1, characterized in that, The top surface of the protrusion protrudes beyond the end face of the explosion-proof hole by a third distance, the third distance being 0.2 to 3 mm.

10. A battery module comprising a plurality of batteries, characterized in that, The battery is the battery described in any one of claims 1-9.

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