Battery and power equipment

Abstract

The utility model relates to the technical field of energy batteries, and discloses a battery and power equipment, which comprises a cover plate, a lower insulating part, a stop block and a flexible connecting piece, the cover plate is provided with an explosion-proof valve, the lower insulating part is arranged on the inner surface of the cover plate, the lower insulating part is provided with a convex hull extending far away from the cover plate, a mounting groove is formed in the convex hull, the stop block is arranged in the mounting groove, and the flexible connecting piece is arranged in the mounting groove. The stop block is suitable for being connected between the cover plate and the pole group in an abutting mode so that an exhaust gap can exist between the anti-explosion valve and the pole group, one end of the flexible connecting piece is connected with the cover plate, and the other end of the flexible connecting piece is connected with the stop block. When thermal runaway occurs, the pole group and the cover plate can be blocked through the stop block, so that an exhaust gap always exists between the anti-explosion valve and the pole group, the anti-explosion valve is prevented from being blocked, the pressure of the battery is released in time, safety accidents such as fire, explosion and the like are avoided, and the flexible connecting piece can prevent the stop block from shifting in the battery and also can absorb shock and buffer; and the collision damage probability of the pole group is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy batteries, and in particular to a battery and power equipment. Background Art

[0002] When thermal runaway occurs in the battery cells of the prior art, the internal temperature can reach over 600°C in a short period of time, and the internal plastic materials such as the side panels, bare battery cell insulating sheets, end panels, and lower insulating parts will quickly melt and fail. At this time, the electrode group inside the shell is easily unbalanced under the action of high-temperature and high-pressure gas. Since the pressure at the explosion-proof valve on the cover plate is relatively low, the electrode group can easily move toward the side of the explosion-proof valve, thereby blocking the explosion-proof valve and causing the explosion-proof valve to fail. The battery cannot be depressurized in time, resulting in fire and explosion. Utility Model Content

[0003] In view of this, the utility model provides a battery and a power device to solve the problem that the existing pole group is easy to move toward the side of the explosion-proof valve during thermal runaway, thereby blocking the explosion-proof valve and causing the explosion-proof valve to fail, and the battery cannot be depressurized in time, resulting in fire and explosion.

[0004] The first aspect of the utility model provides a battery, including a cover plate, a lower insulating member, a stop block and a flexible connector, wherein the cover plate is provided with an explosion-proof valve, the lower insulating member is arranged on the inner surface of the cover plate, the lower insulating member has a bulge extending away from the cover plate, a mounting groove is formed in the bulge, the stop block is arranged in the mounting groove, the stop block is suitable for abutting between the cover plate and the pole group so that there is an exhaust gap between the explosion-proof valve and the pole group, one end of the flexible connector is connected to the cover plate, and the other end of the flexible connector is connected to the stop block.

[0005] Beneficial effect: by arranging a stop block in the mounting groove in the bulge of the lower insulating member, the stop block is suitable for abutting between the cover plate and the pole group. When thermal runaway occurs, even if the lower insulating member melts at high temperature, the stop block can block the pole group and the cover plate, thereby preventing the pole group from moving toward the explosion-proof valve under the action of high temperature and high pressure, thereby blocking the explosion-proof valve. There is always an exhaust gap between the explosion-proof valve and the pole group, thereby ensuring the normal use function of the explosion-proof valve, facilitating the discharge of gas and heat in the battery, and timely depressurizing the battery to avoid safety accidents such as fire and explosion. The flexible connector can make the stop block and the cover plate flexibly connected, thereby preventing the stop block from shifting inside the battery after the lower insulating member melts, and when the pole group abuts against the stop block, the flexible connector can absorb shock and buffer, thereby reducing the probability of collision damage to the pole group.

[0006] In some embodiments, a mounting hole is provided on the stop block, and the other end of the flexible connector is disposed in the mounting hole.

[0007] Beneficial effect: The mounting hole plays a positioning role in the installation of the flexible connector, and can also increase the matching area between the flexible connector and the stop block, thereby improving the connection stability between the two.

[0008] In some embodiments, the mounting hole is disposed through the bottom of the stop block.

[0009] Beneficial effect: It is also convenient for the electrolyte to be discharged from the mounting hole, thereby preventing the electrolyte from accumulating in the mounting hole.

[0010] In some embodiments, a fixing member is disposed in the mounting hole, and the fixing member is connected to the other end of the flexible connector.

[0011] Beneficial effect: The setting of the fixing piece can fix the flexible connecting piece in the mounting hole, thereby preventing the flexible connecting piece from falling out of the mounting hole.

[0012] In some embodiments, one of the stop block and the mounting groove is provided with a protrusion, and the other is provided with a groove, and the protrusion is snap-fitted into the groove.

[0013] Beneficial effect: By providing a protrusion on one of the stop block and the mounting groove and a groove on the other, when the stop block is assembled in the mounting groove, the protrusion is snapped into the groove to enhance the structural assembly strength between the stop block and the mounting groove.

[0014] In some embodiments, the protrusion is arranged on the side wall of the installation groove, the groove is arranged on the side of the stop block, and the top surface of the protrusion is provided with a chamfer to guide the assembly of the stop block.

[0015] Beneficial effect: By setting a chamfer on the top surface of the protrusion, the stop block can slide into the installation groove along the chamfer during the process of being installed into the installation groove. Therefore, the chamfer plays an avoidance and guiding role in the assembly of the stop block, reducing the difficulty of assembling the stop block into the installation groove.

[0016] In some embodiments, the protrusion is arranged on the side of the stop block, the groove is arranged on the side wall of the mounting groove, and the bottom surface of the protrusion is provided with a chamfer.

[0017] Beneficial effect: When the protrusion is set on the side of the stop block, a chamfer is set on the bottom surface of the protrusion. When the stop block is installed into the installation groove, the chamfer can slide into the installation groove along the edge of the installation groove, which can also reduce the difficulty of assembling the stop block into the installation groove.

[0018] In some embodiments, the convex bump is provided with a drainage hole connected to the mounting groove.

[0019] Beneficial effect: The setting of the drain hole can timely discharge the electrolyte accumulated in the installation groove to ensure the effective liquid filling amount inside the battery.

[0020] In some embodiments, the drainage hole is located at the bottom of the mounting groove and is in a cross shape.

[0021] Beneficial effect: The drainage hole is arranged at the bottom of the installation groove, so that the electrolyte accumulated in the installation groove can be completely discharged, and the cross-shaped drainage hole increases the effective drainage area and improves the drainage efficiency.

[0022] The second aspect of the utility model further provides a power device, comprising the battery of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of a three-dimensional exploded structure of a battery according to an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the back structure of a battery according to an embodiment of the utility model;

[0026] Figure 3 for Figure 2 Schematic diagram of the three-dimensional decomposition structure;

[0027] Figure 4 A top view of a battery according to an embodiment of the present utility model;

[0028] Figure 5 for Figure 4 Sectional view of AA in the middle;

[0029] Figure 6 A partial enlarged view of a battery according to an embodiment of the present utility model;

[0030] Figure 7 This is a schematic structural diagram of a stop block according to an embodiment of the utility model;

[0031] Figure 8 This is a schematic diagram of the overall structure of a battery in another embodiment of the utility model;

[0032] Fig. 9 This is a schematic diagram of a three-dimensional exploded structure of a battery according to another embodiment of the present invention;

[0033] Fig.10 A front view of a battery according to another embodiment of the present invention;

[0034] Fig.11 for Fig.10 Cross-sectional view along the B axis.

[0035] Description of reference numerals:

[0036] 1. Cover plate; 11. Explosion-proof valve; 2. Lower insulating member; 21. Bump; 211. Mounting groove; 2111. Protrusion; 21111. Chamfer; 212. Drain hole; 3. Stop block; 31. Groove; 32. Mounting hole; 4. Flexible connector; 5. Fixing member. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0038] Combine the following Figures 1 to 11 , describing an embodiment of the utility model.

[0039] On the one hand, the present embodiment discloses a battery, comprising a cover plate 1, a lower insulating member 2, a stop block 3 and a flexible connector 4, wherein the cover plate 1 is provided with an explosion-proof valve 11, the lower insulating member 2 is arranged on the inner surface of the cover plate 1, the lower insulating member 2 has a bulge 21 extending away from the cover plate 1, a mounting groove 211 is formed in the bulge 21, the stop block 3 is arranged in the mounting groove 211, the stop block 3 is made of a high temperature resistant and electrolyte resistant material, the stop block 3 is suitable for abutting between the cover plate 1 and the pole group so that there is an exhaust gap between the explosion-proof valve 11 and the pole group, one end of the flexible connector 4 is connected to the cover plate 1, and the other end of the flexible connector 4 is connected to the stop block 3.

[0040] The battery of this embodiment is provided with a stop block 3 in the mounting groove 211 in the convex bump 21 of the lower insulating member 2. The stop block 3 is suitable for abutting between the cover plate 1 and the electrode group. When thermal runaway occurs, even if the lower insulating member 2 melts at high temperature, the electrode group and the cover plate 1 can be blocked by the stop block 3 to prevent the electrode group from moving toward the explosion-proof valve 11 under the action of high temperature and high pressure, thereby blocking the explosion-proof valve 11. An exhaust gap is always present between the explosion-proof valve 11 and the electrode group, thereby ensuring the normal use function of the explosion-proof valve 11, facilitating the discharge of gas and heat in the battery, and timely depressurizing the battery to avoid safety accidents such as fire and explosion. The flexible connector 4 can make the stop block 3 and the cover plate 1 flexibly connected, thereby preventing the stop block 3 from shifting inside the battery after the lower insulating member 2 melts, and when the electrode group abuts against the stop block 3, the flexible connector 4 can absorb shock and buffer, thereby reducing the probability of collision damage to the electrode group.

[0041] In this embodiment, the cover plate 1 can be a rectangular plate or a circular plate, which is specifically related to the shape of the battery. When the battery is a rectangular battery, the cover plate 1 is a rectangular plate, and when the battery is a cylindrical battery, the cover plate 1 is a circular plate. The cover plate 1 can specifically be a plain aluminum plate.

[0042] When thermal runaway occurs inside the battery, the pressure will gradually increase. When the pressure reaches the opening pressure of the explosion-proof valve 11, the explosion-proof valve 11 opens to timely exhaust and release the pressure inside the battery. Since the specific structure of the explosion-proof valve 11 is prior art, it will not be described in detail in this embodiment.

[0043] The lower insulating member 2 is connected to the inner surface of the cover plate 1 , and plays a role in insulating the internal electrode group of the battery and the cover plate 1 , and can insulate and protect the entire inner surface of the cover plate 1 .

[0044] The arrangement of the convex hump 21 facilitates forming a mounting groove 211 for mounting the stop block 3 on the inner side, and the convex hump 21 is formed by extending a portion of the lower insulating member 2 away from the cover plate 1, which can reduce the material used for the lower insulating member 2 as much as possible, thereby saving material and reducing weight.

[0045] In terms of specific shape, the stop block 3 can be set to a square, a cross or a groove. Correspondingly, the convex 21 can also be set to a square, a cross or a groove, and the mounting groove 211 in the convex 21 is matched with the stop block 3, and can be specifically set to a square groove, a cross groove or a groove shape that matches the stop block 3.

[0046] Of course, in other embodiments, the shapes of the convex 21, the mounting groove 211 and the stopper 3 can be designed and adjusted as needed, as long as the shapes of the three are consistent and matched. For example, the stopper 3 is set as a cylinder, and the convex 21 and the mounting groove 211 are set as cylindrical accordingly.

[0047] In terms of the number of stop blocks 3, a plurality of stop blocks 3 can be provided, which are spaced apart along the length direction of the lower insulating member 2, so as to improve the abutment stability at various locations of the electrode group.

[0048] As for the setting position, preferably, the stop block 3 and the explosion-proof valve 11 are staggered to avoid the stop block 3 blocking the explosion-proof valve 11 and ensure the normal exhaust and pressure relief function of the explosion-proof valve 11.

[0049] The stop block 3 is made of a material that is resistant to high temperatures and electrolytes, and the stop block 3 will not melt even if thermal runaway occurs in the battery.

[0050] When a battery experiences thermal runaway, the internal temperature can reach 600°C in a short period of time. Therefore, the high temperature resistance temperature of the stop block 3 of this embodiment is set to be greater than 600°C. Even when the battery experiences thermal runaway, the stop block 3 will not melt, but will only carbonize on the surface, and can be used in an environment of 600°C for a long time.

[0051] As for the specific material, the stop block 3 can be made of ceramic material, and ceramic has good high temperature resistance and electrolyte resistance.

[0052] In this embodiment, one of the stop block 3 and the mounting groove 211 is provided with a protrusion 2111 , and the other is provided with a groove 31 , and the protrusion 2111 is engaged in the groove 31 .

[0053] By setting a protrusion 2111 on one of the stop block 3 and the mounting groove 211 and setting a groove 31 on the other, when the stop block 3 is assembled in the mounting groove 211, the protrusion 2111 is snapped into the groove 31 to enhance the structural assembly strength between the stop block 3 and the mounting groove 211.

[0054] It is understandable that the lower insulating member 2 is made of plastic, and therefore the bulge 21 thereon also has a certain degree of deformation ability. When the stop block 3 is installed in the mounting groove 211 of the bulge 21, the stop block 3 will squeeze the mounting groove 211, causing the mounting groove 211 to expand to a certain extent to facilitate the stop block 3 to be installed in the mounting groove 211, until the protrusion 2111 is snapped into the groove 31, and the mounting groove 211 contracts and resets to wrap the stop block 3.

[0055] In some embodiments, Figure 1 , Figure 3 , Figure 6 and Figure 7As shown, the protrusion 2111 is arranged on the side wall of the installation groove 211, the groove 31 is arranged on the side of the stop block 3, and the top surface of the protrusion 2111 is provided with a chamfer 21111 for guiding the assembly of the stop block 3. By providing the chamfer 21111 on the top surface of the protrusion 2111, the stop block 3 can slide into the installation groove 211 along the chamfer 21111 during the process of being installed in the installation groove 211, so the chamfer 21111 plays an avoidance and guiding role in the assembly of the stop block 3, reducing the difficulty of assembling the stop block 3 into the installation groove 211.

[0056] Specifically, two protrusions 2111 are provided and are arranged on two opposite side walls of the installation groove 211, and two opposite side surfaces of the stop block 3 are provided with grooves 31 that match the two protrusions 2111 one by one, thereby achieving a close fit between the two side surfaces of the stop block 3 and the two side walls of the installation groove 211.

[0057] In other embodiments, Figures 8 to 11 As shown, the protrusion 2111 is arranged on the side of the stop block 3, the groove 31 is arranged on the side wall of the installation groove 211, and the bottom surface of the protrusion 2111 is provided with a chamfer 21111. When the protrusion 2111 is arranged on the side of the stop block 3, the chamfer 21111 is arranged on the bottom surface of the protrusion 2111, and the chamfer 21111 can slide into the installation groove 211 along the edge of the installation groove 211 during the process of the stop block 3 being installed in the installation groove 211, and it can also play a role in reducing the difficulty of assembling the stop block 3 into the installation groove 211.

[0058] Specifically, the chamfer 21111 may be an arc-shaped chamfer 21111 or a bevel chamfer 21111, and this embodiment does not impose any specific limitation thereto.

[0059] Further, such as Figure 2 , Figure 3 or Fig.11 As shown, the convex bump 21 is provided with a drainage hole 212 connected to the mounting groove 211. The arrangement of the drainage hole 212 can timely discharge the electrolyte accumulated in the mounting groove 211 to ensure an effective amount of liquid injection inside the battery.

[0060] In terms of the location and shape, the drain hole 212 is located at the bottom of the mounting groove 211 and is cross-shaped. The drain hole 212 is arranged at the bottom of the mounting groove 211 to facilitate the discharge of all the electrolyte accumulated in the mounting groove 211, and the cross-shaped drain hole 212 increases the effective drainage area and improves the drainage efficiency.

[0061] Of course, in other embodiments, the drainage hole 212 may also be configured as a circular hole or a straight hole, and is not limited to the solution of this embodiment.

[0062] The flexible connector 4 and the cover plate 1 can be fixed by welding, threaded connection or other connection methods.

[0063] Furthermore, the stop block 3 is provided with a mounting hole 32, and the other end of the flexible connector 4 is arranged in the mounting hole 32. The mounting hole 32 plays a positioning role in the installation of the flexible connector 4, and can also increase the matching area between the flexible connector 4 and the stop block 3, thereby improving the connection stability between the two.

[0064] In this embodiment, the mounting hole 32 is arranged through the bottom of the stop block 3 , so that the electrolyte can be discharged from the mounting hole 32 and the electrolyte can be prevented from accumulating in the mounting hole 32 of the stop block 3 .

[0065] Specifically, the mounting hole 32 and the drainage hole 212 are correspondingly connected, so that the electrolyte in the mounting hole 32 can be discharged through the drainage hole 212 in time.

[0066] In some embodiments, Figure 2 , Figure 6 and Figure 7 As shown, a fixing member 5 is arranged in the mounting hole 32, and the fixing member 5 is connected to the other end of the flexible connector 4. The setting of the fixing member 5 can fix the flexible connector 4 in the mounting hole 32 to prevent the flexible connector 4 from falling out of the mounting hole 32.

[0067] Specifically, the fixing member 5 can be a straight rib arranged at the bottom of the mounting hole 32, and the bottom (the other end) of the flexible connector 4 abuts against the straight rib. The gap between the two sides of the straight rib and the inner wall of the mounting hole 32 facilitates the discharge of the electrolyte in the mounting hole 32.

[0068] Of course, in other embodiments, the fixing member 5 can also be a mesh structure arranged at the bottom of the mounting hole 32, and the bottom (the other end) of the flexible connecting member 4 abuts against the mesh structure, and the electrolyte in the mounting hole 32 can be discharged through the mesh holes of the mesh structure.

[0069] Furthermore, the flexible connector 4 can be a coil spring, one end of which is welded to the cover plate 1 , and the other end of which extends into the mounting hole 32 and is connected to the fixing member 5 . When the pole group abuts against the stop block 3 , the coil spring is elastically compressed.

[0070] Of course, the flexible connecting member 4 may also be other elastic structures such as springs.

[0071] In addition to the above configuration, the battery of this embodiment also includes a shell, the shell has an opening, the cover plate 1 is connected to the opening of the shell, and the two cooperate to form an installation cavity, and the pole group, the lower insulating member 2, the stop block 3 and other structures are all located in the installation cavity. When the battery has thermal runaway, the internal plastic materials such as the lower insulating member 2 will quickly melt and fail. At this time, the pole group in the installation cavity is easy to lose balance under the action of the internal high-temperature and high-pressure gas. Since the pressure at the explosion-proof valve 11 is relatively low, the pole group is easy to move toward the explosion-proof valve 11, and the stop block 3 can abut and limit the pole group to prevent it from blocking the explosion-proof valve 11, ensuring that the battery can release pressure in time.

[0072] On the other hand, this embodiment also discloses a power device, including the battery of this embodiment. Since the power device of this embodiment includes the battery of this embodiment, it has the same technical effect as the battery, and will not be described in detail here.

[0073] Specifically, the power equipment may be an electric car or an electric tool, etc., and this embodiment does not impose any specific limitation.

[0074] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: The cover plate is provided with an explosion-proof valve; A lower insulating member is arranged on the inner surface of the cover plate, the lower insulating member has a convex bump extending away from the cover plate, and a mounting groove is formed in the convex bump; A stop block is arranged in the mounting groove, and the stop block is suitable for abutting between the cover plate and the pole group so that there is an exhaust gap between the explosion-proof valve and the pole group; A flexible connector, one end of which is connected to the cover plate, and the other end of which is connected to the stop block.

2. The battery according to claim 1, characterized in that The stop block is provided with a mounting hole, and the other end of the flexible connecting member is arranged in the mounting hole.

3. The battery according to claim 2, characterized in that The mounting hole is arranged through the bottom of the stop block.

4. The battery according to claim 3, characterized in that A fixing piece is arranged in the mounting hole, and the fixing piece is connected to the other end of the flexible connecting piece.

5. The battery according to any one of claims 1 to 4, characterized in that One of the stop block and the mounting groove is provided with a protrusion, and the other is provided with a groove, and the protrusion is clamped in the groove.

6. The battery according to claim 5, characterized in that The protrusion is arranged on the side wall of the installation groove, the groove is arranged on the side of the stop block, and the top surface of the protrusion is provided with a chamfer for guiding the assembly of the stop block.

7. The battery according to claim 5, characterized in that The protrusion is arranged on the side surface of the stop block, the groove is arranged on the side wall of the mounting groove, and the bottom surface of the protrusion is arranged with a chamfer.

8. The battery according to any one of claims 1 to 4, characterized in that The convex bump is provided with a drainage hole connected to the mounting groove.

9. The battery according to claim 8, characterized in that The drainage hole is located at the bottom of the mounting groove and is in a cross shape.

10. A power device, characterized in that: A battery comprising the battery according to any one of claims 1 to 9.

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