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, an end plate and a stopper, the cover plate is provided with an explosion-proof valve, the end plate is arranged between the cover plate and a pole group, the end plate is provided with a mounting groove, the stopper is arranged in the mounting groove, the stopper is made of high-temperature-resistant and electrolyte-resistant materials, and the end plate is provided with an anti-explosion valve. The stop piece is suitable for being connected between the pole group and the cover plate in an abutting mode so that an exhaust gap can exist between the anti-explosion valve and the pole group. When the battery is in thermal runaway, the end plate is melted at high temperature, and the pole group and the cover plate can be blocked through the stop piece made of the high-temperature-resistant and electrolyte-resistant material, so that the pole group is prevented from moving towards the anti-explosion valve under the action of high temperature and high pressure to block the anti-explosion valve, and an exhaust gap always exists between the anti-explosion valve and the pole group; the normal use function of the anti-explosion valve is ensured, gas and heat in the battery can be discharged conveniently, the battery can be decompressed in time, and safety accidents such as fire and explosion are avoided. And setting.

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 plastics 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 release pressure in time, causing 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, comprising a cover plate, an end plate and a stopper, wherein the cover plate is provided with an explosion-proof valve, the end plate is arranged between the cover plate and the pole group, the end plate is provided with a mounting groove, the stopper is arranged in the mounting groove, the stopper is made of a high temperature resistant and electrolyte resistant material, and the stopper is suitable for abutting between the pole group and the cover plate so that there is an exhaust gap between the explosion-proof valve and the pole group.

[0005] Beneficial effects: When thermal runaway occurs, the end plate melts at high temperature, and the stopper made of high temperature resistant and electrolyte resistant material can also block the electrode group and the cover plate, preventing the electrode group from moving toward the explosion-proof valve under high temperature and high pressure, causing the explosion-proof valve to be blocked, so that there is always an exhaust gap between the explosion-proof valve and the electrode group, ensuring the normal use function of the explosion-proof valve, facilitating the discharge of gas and heat in the battery, and allowing the battery to be depressurized in time to avoid safety accidents such as fire and explosion.

[0006] In some embodiments, the stopper has a contact surface capable of contacting the cover plate, and the area of ​​the contact surface is greater than or equal to 1 cm 2 .

[0007] Beneficial effect: By setting the size of the abutment surface, it is possible to ensure that the stopper and the cover plate have sufficient contact area, thereby ensuring the abutment stability of the stopper.

[0008] In some embodiments, the position of the stopper corresponds to the setting of the explosion-proof valve, the width of the stopper is greater than the width of the notch of the explosion-proof valve, and / or the length of the stopper is greater than the length of the notch of the explosion-proof valve.

[0009] Beneficial effect: When the position of the stopper and the explosion-proof valve are set correspondingly, by limiting the width of the stopper to be larger than the width of the notch of the explosion-proof valve, and / or the length of the stopper to be larger than the length of the notch of the explosion-proof valve, the stopper can be prevented from escaping from the explosion-proof valve and leaving the battery.

[0010] In some embodiments, the stopper is a glue injection, which is injected into the installation groove; and / or the stopper and the explosion-proof valve are staggered.

[0011] Beneficial effects: By using an integral injection molding method to inject the stopper into the installation groove, it has the advantages of low cost, high assembly efficiency, and no burrs; the stopper and the explosion-proof valve are staggered to avoid the stopper blocking the explosion-proof valve, thereby ensuring the normal use of the explosion-proof valve.

[0012] In some embodiments, the battery further includes a lower insulating member connected to an inner surface of the cap plate and located between the cap plate and the end plate.

[0013] Beneficial effects: The lower insulating member plays the role of insulating the internal pole group and the cover plate, and can provide insulation protection for the entire inner surface of the cover plate.

[0014] In some embodiments, the lower insulating member is provided with an avoidance opening, the cover plate is provided with a limiting groove corresponding to the avoidance opening, and the top of the stopper passes through the avoidance opening and is located in the limiting groove.

[0015] Beneficial effect: By setting a limit groove on the cover plate and an avoidance opening on the lower insulating member, the avoidance opening corresponds to the limit groove, and the top of the stop member passes through the avoidance opening and is located in the limit groove to limit the position of the stop member, thereby avoiding displacement of the stop member after the end plate and the lower insulating member melt, thereby ensuring the installation stability of the stop member.

[0016] In some embodiments, the high temperature resistance of the stopper is greater than or equal to 800°C.

[0017] Beneficial effect: Since the internal temperature of the battery can reach 600°C in a short period of time when thermal runaway occurs, the high temperature resistance temperature of the stopper of the utility model is set to be greater than or equal to 800°C. At this temperature, only the surface of the stopper is carbonized and can be used for a long time in an environment of 600°C.

[0018] In some embodiments, the thermal conductivity of the stopper is 0.03 W / mK to 10 W / mK.

[0019] Beneficial effect: By setting the thermal conductivity of the stopper within a reasonable range, the thermal conductivity of the stopper can be enhanced, the heat dissipation performance of the stopper can be improved, and this is beneficial to the heat dissipation of the battery during thermal runaway.

[0020] In some embodiments, the density of the stopper is 0.8 g / cm 3 ~1.5g / cm 3 .

[0021] Beneficial effect: By setting the density of the stopper within a reasonable range, the mass density and weight of the stopper can be ensured, which is beneficial to the lightweight design of the battery.

[0022] The second aspect of the utility model further provides a power device, including the battery of the utility model. Since the power device of the utility model includes the battery of the utility model, it has the same technical effect as the battery, which will not be described in detail here. 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 A schematic diagram of the three-dimensional structure of a battery according to an embodiment of the utility model;

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

[0026] Figure 3 A top view of a battery according to an embodiment of the present utility model;

[0027] Figure 4 for Figure 3 Sectional view of AA.

[0028] Description of reference numerals:

[0029] 1. Cover plate; 11. Explosion-proof valve; 2. End plate; 21. Mounting groove; 3. Stopper; 4. Lower insulating member. DETAILED DESCRIPTION

[0030] 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.

[0031] like Figures 1 to 4 As shown, according to an embodiment of the utility model, on the one hand, a battery is disclosed, comprising a cover plate 1, an end plate 2 and a stopper 3, wherein the cover plate 1 is provided with an explosion-proof valve 11, the end plate 2 is arranged between the cover plate 1 and the pole group, the end plate 2 is provided with a mounting groove 21, the stopper 3 is arranged in the mounting groove 21, the stopper 3 is made of a high temperature resistant and electrolyte resistant material, and the stopper 3 is suitable for abutting between the pole group and the cover plate 1 so that there is an exhaust gap between the explosion-proof valve 11 and the pole group.

[0032] In the battery of this embodiment, when thermal runaway occurs, the end plate 2 melts at high temperature, and the stopper 3 made of high temperature resistant and electrolyte resistant material can also be used to block the electrode group and the cover plate 1, so as 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, so that there is always an exhaust gap 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 allowing the battery to be depressurized in time to avoid safety accidents such as fire and explosion.

[0033] 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.

[0034] The end plate 2 is connected to the electrode group and is used for mounting and positioning the electrode group. The end plate 2 is specifically made of plastic material, so it is easy to melt and fail when the battery has thermal runaway.

[0035] The stopper 3 is made of a high temperature resistant and electrolyte resistant material, so it will not melt even if the battery has thermal runaway. It can abut between the cover plate 1 and the electrode group, so that there is always an exhaust gap between the electrode group and the explosion-proof valve 11, ensuring the normal pressure relief function of the explosion-proof valve 11.

[0036] Specifically, because the internal temperature of the battery can reach 600°C in a short time when thermal runaway occurs, the high temperature resistance temperature of the stopper 3 of this embodiment is set to be greater than or equal to 800°C. At this temperature, only the surface of the stopper 3 is carbonized and can be used in an environment of 600°C for a long time.

[0037] Furthermore, the thermal conductivity of the stopper 3 is 0.03W / mK to 10W / mK. By setting the thermal conductivity of the stopper 3 within a reasonable range, the thermal conductivity of the stopper 3 can be enhanced, the heat dissipation performance of the stopper 3 can be improved, and the heat dissipation of the stopper 3 can be facilitated to dissipate heat when the battery is in thermal runaway.

[0038] Exemplarily, the thermal conductivity of the stopper 3 may be 0.03 W / mK, 5 W / mK or 10 W / mK, etc., which is not specifically limited in this embodiment.

[0039] In some embodiments, the density of the stopper 3 is 0.8 g / cm 3 ~1.5g / cm 3 By setting the density of the stopper 3 within a reasonable range, the mass density and weight of the stopper 3 can be ensured, which is beneficial to the lightweight design of the battery.

[0040] For example, the density of the stopper 3 may be 0.8 g / cm 3 , 1g / cm 3 or 1.5g / cm 3 Etc., this embodiment does not make specific limitations.

[0041] As for the specific material, the stopper 3 is made of aluminum oxide, which has good high temperature resistance and electrolyte resistance and meets the use requirements.

[0042] In terms of the shape, the shape and size of the installation groove 21 match the shape and size of the stopper 3. For example, if the stopper 3 is a rectangular parallelepiped, the corresponding installation groove 21 is set as a rectangular groove. If the stopper 3 is a cylinder, the corresponding installation groove 21 is set as a cylindrical groove. In this embodiment, the installation groove 21 is a rectangular groove and the stopper 3 is a rectangular parallelepiped as an example for exemplary description.

[0043] In addition, the stopper 3 has a contact surface capable of contacting the cover plate 1, and the area of ​​the contact surface is greater than or equal to 1 cm 2 By setting the size of the abutting surface, it is possible to ensure that the stopper 3 and the cover plate 1 have sufficient contact area, thereby ensuring the abutting stability of the stopper 3 .

[0044] In some embodiments, the stopper 3 and the explosion-proof valve 11 are staggered to avoid the stopper 3 blocking the explosion-proof valve 11 and ensure the normal use of the explosion-proof valve 11.

[0045] In other embodiments, the position of the stopper 3 is set corresponding to the explosion-proof valve 11, the width of the stopper 3 is greater than the width of the notch of the explosion-proof valve 11, and / or the length of the stopper 3 is greater than the length of the notch of the explosion-proof valve 11. When the position of the stopper 3 is set corresponding to the explosion-proof valve 11, by limiting the width of the stopper 3 to be greater than the width of the notch of the explosion-proof valve 11, and / or the length of the stopper 3 to be greater than the length of the notch of the explosion-proof valve 11, the stopper 3 can be prevented from escaping from the explosion-proof valve 11 and leaving the battery.

[0046] It should be noted here that the overall size of the stopper 3 is smaller than the overall size of the explosion-proof valve 11 to ensure the normal pressure relief function of the explosion-proof valve 11 and avoid the stopper 3 completely blocking the explosion-proof valve 11.

[0047] Specifically, the stopper 3 can be a glue injection, which is injection-molded in the installation groove 21. By using an integral injection molding method to inject the stopper 3 into the installation groove 21, it has the advantages of low cost, high assembly efficiency, and no burrs.

[0048] Of course, in some embodiments, the stopper 3 can also be separately injection molded or machined, and then the manufactured stopper 3 is placed in the installation groove 21 .

[0049] In terms of the number of stops 3, a plurality of stops 3 may be provided, which are spaced apart along the length direction of the end plate 2, so as to improve the abutment stability at various locations of the electrode group.

[0050] In addition to the above configuration, the battery further includes a lower insulating member 4, which is connected to the inner surface of the cover plate 1 and is located between the cover plate 1 and the end plate 2. The lower insulating member 4 serves to insulate the internal electrode group and the cover plate 1, and can insulate and protect the entire inner surface of the cover plate 1.

[0051] The lower insulating member 4 can be made of plastic or rubber.

[0052] In some embodiments, the lower insulating member 4 is provided with an escape opening, the cover plate 1 is provided with a limiting groove (not shown in the figure) corresponding to the escape opening, and the top of the stopper 3 passes through the escape opening and is located in the limiting groove.

[0053] By setting a limit groove on the cover plate 1 and an avoidance opening on the lower insulating member 4, the avoidance opening corresponds to the limit groove, and the top of the stop member 3 passes through the avoidance opening and is located in the limit groove, so as to limit the position of the stop member 3 through the limit groove to avoid displacement of the stop member 3 after the end plate 2 and the lower insulating member 4 melt, thereby ensuring the installation stability of the stop member 3.

[0054] The shapes and sizes of the limiting groove and the avoidance opening match the cross-sectional shape and size of the stopper 3, so that the stopper 3 can be matched and installed in the limiting groove through the avoidance opening.

[0055] Of course, the battery also includes a shell, which has an opening, and the cover plate 1 is connected to the opening of the shell. The two cooperate to form an installation cavity, and the pole group, end plate 2, lower insulating member 4, stopper 3 and other structures are all located in the installation cavity. When the battery has thermal runaway, the internal temperature can reach 600°C in a short period of time, and the internal plastic materials such as the end plate 2 and the lower insulating member 4 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. Because 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 stopper 3 can abut and limit the pole group to prevent it from blocking the explosion-proof valve 11, resulting in the battery being unable to release pressure in time and catching fire or exploding.

[0056] 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.

[0057] Specifically, the power equipment may be an electric car or an electric tool, etc., and this embodiment does not impose any specific limitation.

[0058] 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; An end plate is arranged between the cover plate and the pole group, and the end plate is provided with a mounting groove; A stopper is arranged in the installation groove, the stopper is made of a high temperature resistant and electrolyte resistant material, and the stopper is suitable for abutting between the pole group and the cover plate so that an exhaust gap exists between the explosion-proof valve and the pole group.

2. The battery according to claim 1, characterized in that The stopper has a contact surface capable of contacting the cover plate, and the area of ​​the contact surface is greater than or equal to 1 cm 2 .

3. The battery according to claim 1, characterized in that The position of the stopper corresponds to the setting of the explosion-proof valve, the width of the stopper is greater than the width of the notch of the explosion-proof valve, and / or the length of the stopper is greater than the length of the notch of the explosion-proof valve.

4. The battery according to claim 1, characterized in that The stopper is a glue injection, which is injected into the installation groove; and / or the stopper and the explosion-proof valve are staggered.

5. The battery according to claim 1, characterized in that The battery further includes a lower insulating member connected to an inner surface of the cap plate and located between the cap plate and the end plate.

6. The battery according to claim 5, characterized in that The lower insulating member is provided with an escape opening, the cover plate is provided with a limiting groove corresponding to the escape opening, and the top of the stopper passes through the escape opening and is located in the limiting groove.

7. The battery according to any one of claims 1 to 6, characterized in that The high temperature resistance of the stopper is greater than or equal to 800°C.

8. The battery according to any one of claims 1 to 6, characterized in that The thermal conductivity of the stopper is 0.03W / mK to 10W / mK.

9. The battery according to any one of claims 1 to 6, characterized in that The density of the stopper is 0.8 g / cm 3 ~1.5g / cm 3 .

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

Images