Cover plate, battery, battery pack and energy storage system
By setting seals and heat insulation in the battery cover, the problem of electrolyte spraying when the battery is thermally out of control is solved, and safety improvement and accident prevention are achieved.
Patent Information
- Application Number
- CN202420337976.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-22
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-02-22
AI Technical Summary
When a battery is thermally out of control, it may cause the electrolyte to eject from the circumference of the pole column, contact the charged components and cause safety accidents such as fire.
A cover plate is designed, including a plate body, a pole, a seal and a heat insulation. A seal is disposed between the pole column and the plate body, and a heat insulating member is disposed between the seal and the pole column to block heat and maintain sealing properties.
It effectively prevents the electrolyte from ejecting from the peripheral side of the pole column, reduces shrinkage or hot melt caused by heat of the seal, and avoids safety accidents such as battery fire.
Smart Images
Figure CN222883682U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and in particular to a cover plate, a battery, a battery pack and an energy storage system. Background Art
[0002] As the pace of global energy transformation accelerates, new energy battery technology has become a key force in promoting this process. At present, batteries have been widely used in the fields of power and energy storage.
[0003] However, when thermal runaway occurs, electrolyte leakage may occur around the electrode. The ejected electrolyte may come into contact with charged electrodes, buses, etc., causing safety accidents such as battery fires. Utility Model Content
[0004] The purpose of the present application is to provide a cover plate, a battery, a battery pack and an energy storage system, which are used to prevent safety accidents such as battery fire caused by electrolyte spraying out from the side of the pole and contacting with the charged pole, bus, etc.
[0005] According to a first aspect of an embodiment of the present application, a battery is provided, comprising a cover plate and a shell, the shell being used to accommodate a battery cell, and the cover plate being buckled on the shell. The cover plate comprises a plate body, a pole, a seal and a heat insulating member. A mounting hole is provided on the plate body, and the mounting hole is used to mount the pole. The pole comprises two parts, one part of which passes through the mounting hole, and the other part is located in the shell and is electrically connected to the pole lug of the battery cell. The seal is sleeved on the pole, and the seal is arranged between the plate body and the pole. The heat insulating member is arranged between the seal and the pole.
[0006] After the battery cell is arranged in the shell, the cover plate is buckled on the shell to limit and protect the battery cell and the electrolyte. One part of the pole passes through the mounting hole, and the other part is located in the shell and electrically connected to the pole ear of the battery cell, so that the battery cell and the pole are conductive, and can be connected to an external device through one part. The plate body can support the pole and improve the working stability of the pole. In order to ensure the sealing between the plate body and the pole and prevent the electrolyte from spraying out from between the plate body and the pole, it is necessary to set a seal between the plate body and the pole. In the related art, the seal is arranged between the plate body and the pole, and there is no shielding between the seal and the pole. During the battery charging and discharging operation, a thermal effect will be generated when the current flows through the pole and the connection between the battery cell and the pole, and the resistance at the connection between the battery cell and the pole is large, and more heat is generated. Especially when the battery cell is short-circuited or overcharged, a large amount of heat will be generated at the connection between the battery cell and the pole, and it will be transferred to the seal close to the pole through the pole. When the seal is heated, it may shrink or melt, which greatly reduces the sealing between the plate and the pole. At this time, the electrolyte will spray out from between the plate and the pole, and the sprayed electrolyte will come into contact with the charged pole, busbar, etc., which may cause fire and other safety accidents.
[0007] The cover plate provided in the embodiment of the present application also includes a heat insulating member. The heat insulating member is arranged between the seal and the pole, which can block part of the heat of the pole and reduce the heat transferred to the seal. While the plate body and the pole are sealed by the seal, the heat can also be isolated by the heat insulating member, so that the seal is not easily shrunk or melted due to heat, thereby preventing the electrolyte from spraying out from between the plate body and the pole, that is, around the pole, to avoid safety accidents such as battery fire.
[0008] In some embodiments of the present application, the thermal conductivity of the heat insulating member is lower than that of the sealing member. Therefore, the heat insulating member has a poor thermal conductivity to ensure that the heat insulating member can block part of the heat of the pole and reduce the heat transferred to the sealing member.
[0009] In some embodiments of the present application, the diameter of one part of the pole is smaller than the diameter of another part of the pole. A seal is provided on the outer periphery of one part of the pole, and a heat insulating member is provided between the other part of the pole and the seal. The diameter of the other part of the pole is larger, and after the other part of the pole is electrically connected to the battery cell, the pole and the battery cell have a larger connection area, thereby improving the stability of the connection, and at the same time reducing the contact resistance between the pole and the battery cell, thereby reducing the heat generated at the connection between the pole and the battery cell. In addition, the resistance at the connection between the battery cell and the other part of the pole is larger, and more heat is generated, and more heat will be transferred from the other part of the pole to the seal. At this time, the heat insulating member provided between the other part of the pole and the seal can block the transfer of more heat, thereby reducing the heat transferred to the seal. Avoid shrinkage or hot melting due to excessive heat of the seal, prevent the electrolyte from spraying out from between the plate body and the pole, that is, the side of the pole, and avoid the sprayed electrolyte from contacting with the charged pole, bus, etc., causing safety accidents such as battery fire.
[0010] In some embodiments of the present application, the inner diameter of the heat insulating member is equal to the inner diameter of the seal, and the outer diameter of the heat insulating member is greater than or equal to the outer diameter of the seal. In this case, the heat insulating member can completely separate the seal from another part of the pole, thereby blocking the heat transferred from the other part to the seal, further reducing the heat transferred to the seal, and avoiding shrinkage or hot melting of the seal due to excessive heat.
[0011] In other embodiments of the present application, a heat insulating member is provided around a portion of the pole, and a sealing member is provided around the heat insulating member. In this case, the heat insulating member is provided between the portion of the pole and the sealing member, and the heat insulating member can reduce the heat transferred from the portion of the pole to the sealing member, so as to avoid shrinkage or thermal melting of the sealing member due to excessive heat.
[0012] In some embodiments of the present application, the plate body, the pole and the thermal insulation member are all in contact with the seal. And the contact area between the seal and the thermal insulation member is larger than the contact area between the seal and the pole. At this time, after the seal abuts against the plate body, the pole and the thermal insulation member, the plate body, the pole and the thermal insulation member can all generate a supporting force on the seal, thereby ensuring that the seal fits tightly with the plate body and the pole, thereby ensuring that the plate body and the pole can be relatively sealed through the seal. In addition, the contact area between the seal and the thermal insulation member is larger than the contact area between the seal and the pole. In other words, the contact area between the seal and the pole is small, and the heat transferred to the seal through the contact portion between the seal and a part thereof is small, further preventing the seal from shrinking or hot melting.
[0013] In some embodiments of the present application, the material of the thermal insulation element is a thermal insulation material or a flame retardant material. Exemplarily, the material of the thermal insulation element is a thermal insulation material such as ceramic, aerogel, and a high temperature resistant composite material. Among them, aerogel includes silicon-based aerogel, carbon-based aerogel, metal oxide-based aerogel, etc. The embodiments of the present application are not specifically limited. Also exemplarily, the material of the thermal insulation element is a flame retardant material such as antimony trioxide, magnesium hydroxide, aluminum hydroxide, and hydrated zinc borate. The thermal insulation element using the above materials has a high high temperature resistance, thereby ensuring the stability of the thermal insulation element during operation. In addition, the thermal conductivity of the thermal insulation element is poor, thereby reducing the heat transferred from the pole to the seal through the thermal insulation element.
[0014] In some embodiments of the present application, at least two heat insulating members are stacked between the seal and the pole. The at least two layers of heat insulating members hinder the heat transfer between the pole and the seal, further reducing the heat transferred to the seal, so as to avoid shrinkage or thermal melting of the seal due to excessive heat.
[0015] In some embodiments of the present application, the cover plate further includes an upper plastic part and a lower plastic part. The upper plastic part is filled and arranged between the plate body and the pole, and is located on the side of the seal away from the battery cell. The lower plastic part is arranged between the plate body and the battery cell, and a portion of the lower plastic part is arranged between the plate body and the pole, and is located on the side of the seal facing the battery cell. Among them, the material of the upper plastic part and the material of the lower plastic part are both insulating materials. By means of the upper plastic part and part of the lower plastic part arranged between the plate body and the pole, the pole and the plate body are insulated from each other, thereby preventing the current on the pole from being conducted to the plate body, thereby causing a short circuit. In addition, the plate body and the battery cell are insulated from each other by the lower plastic part, thereby preventing the current on the battery cell from being conducted to the plate body, thereby causing a short circuit.
[0016] According to a second aspect of an embodiment of the present application, a cover plate is provided, the cover plate comprising a plate body, a pole, a seal and a heat insulating member. A mounting hole is provided on the plate body, and the mounting hole is used to mount the pole. The pole comprises two parts, one of which passes through the mounting hole, and the other is located in the shell and electrically connected to the pole lug of the battery cell. The seal is sleeved on the pole, and the seal is arranged between the plate body and the pole. The heat insulating member is arranged between the seal and the pole. The above-mentioned cover plate has the same technical effect as the cover plate in the battery provided in the aforementioned embodiment, which will not be repeated here.
[0017] In a third aspect of the embodiment of the present application, a battery is provided, which includes a cover plate and a shell, the shell is used to accommodate a battery cell, and the cover plate is buckled on the shell. The cover plate includes a plate body, a pole and a flame retardant seal. The plate body is provided with a mounting hole, the mounting hole is used to install the pole, and the pole is electrically connected to the pole lug of the battery cell. The outer periphery of the pole is provided with a flame retardant seal. After the battery cell is arranged in the shell, the cover plate is buckled on the shell, thereby limiting and protecting the battery cell and the electrolyte. The flame retardant seal has good high temperature resistance and is not prone to shrinkage or heat melting due to heat. In order to avoid shrinkage or heat melting due to excessive heat of the flame retardant seal, prevent the electrolyte from spraying out from between the plate body and the pole, that is, the side of the pole, and avoid safety accidents such as battery fire caused by contact between the sprayed electrolyte and the charged pole, bus, etc.
[0018] In some embodiments of the present application, the material of the flame retardant seal is flame retardant rubber. The flame retardant rubber may be a rubber material to which a flame retardant is added. Exemplarily, the flame retardant includes at least one of silicon dioxide, magnesium oxide, magnesium hydroxide, antimony trioxide, paraffin chloride, tricresyl phosphate, etc. The rubber material may be at least one of chloroprene rubber, chlorosulfonated polyethylene, polyvinyl chloride, silicone rubber, etc. The flame retardant seal made of this material has good high temperature resistance and is not prone to shrinkage or hot melting due to heat.
[0019] In a fourth aspect of the embodiments of the present application, a cover plate is provided, which includes a plate body, a pole and a flame retardant seal. The plate body is provided with a mounting hole, which is used to mount the pole, and the pole is electrically connected to the pole lug of the battery cell. A flame retardant seal is provided on the outer periphery of the pole. The above-mentioned cover plate has the same technical effect as the cover plate in the battery provided in the above-mentioned embodiment, and will not be repeated here.
[0020] In a fifth aspect of the embodiments of the present application, a battery pack is provided, which includes a plurality of the above-mentioned batteries, and the plurality of batteries are connected in series or in parallel. A higher voltage and capacity are provided by the plurality of batteries. In addition, the above-mentioned battery pack has the same technical effect as the battery provided in any of the above-mentioned embodiments, which will not be described in detail here.
[0021] In the sixth aspect of the embodiments of the present application, an energy storage system is provided, which includes a power converter and at least one of the above-mentioned battery packs. The power converter is used to convert the voltage output by the battery pack and output it to the power grid or the load, and / or the power converter is used to convert the voltage output by the external power supply and output it to the battery pack. Exemplarily, the power converter is used to convert the voltage output by the battery pack and output it to the power grid. Alternatively, the power converter is used to convert the voltage output by the battery pack and output it to the load. Alternatively, the power converter is used to convert the voltage output by the external power supply and output it to the battery pack. Alternatively, the power converter is used to convert the voltage output by the battery pack and output it to the power grid or the load, and the power converter is also used to convert the voltage output by the external power supply and output it to the battery pack. In addition, the above-mentioned energy storage system has the same technical effect as the battery provided in the above-mentioned embodiment, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 A schematic diagram of the structure of an energy storage system provided in an embodiment of the present application;
[0023] Figure 2 A schematic diagram of the structure of another energy storage system provided in an embodiment of the present application;
[0024] Figure 3 An exploded schematic diagram of a battery pack provided in an embodiment of the present application;
[0025] Figure 4 An exploded schematic diagram of a battery provided in an embodiment of the present application;
[0026] Figure 5 An exploded schematic diagram of a cover plate provided in an embodiment of the present application;
[0027] Fig. 6A for Figure 5 A cross-sectional view of the cover plate along the direction O1-O2 after the components are assembled;
[0028] Figure 6B for Figure 5 Another cross-sectional view of the cover plate along the direction O1-O2 after the components are assembled;
[0029] Figure 7 for Figure 5 Another cross-sectional view of the cover plate along the direction O1-O2 after the components are assembled;
[0030] Figure 8 A cross-sectional view of another cover plate provided in an embodiment of the present application;
[0031] Fig. 9An exploded schematic diagram of another cover plate provided in an embodiment of the present application;
[0032] Fig.10 for Fig. 9 The cross-sectional view of the cover plate along the P1-P2 direction after the components are assembled.
[0033] Reference numerals:
[0034] 100-energy storage system; 01-battery pack; 02-power converter; 03-grid; 04-load; 05-photovoltaic module; 10-battery; 11-cover; 111-board; 1111-mounting hole; 1112-upper injection hole; 1113-groove; 112-pole; 112A-positive pole; 112B-negative pole; 1121-one part; 1122-the other Part; 113-seal; 114-explosion-proof valve; 115-insulation; 116-upper plastic part; 1161-first through hole; 117-lower plastic part; 1171-second through hole; 1172-lower injection hole; 118-flame retardant seal; 12-battery cell; 121-ear; 121C-positive electrode ear; 121D-negative electrode ear; 13-shell; 20-box; 30-box cover. DETAILED DESCRIPTION
[0035] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.
[0036] In the following, the terms "first", "second", etc. are used only for convenience of description and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0037] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a mechanical connection or an electrical connection; wherein the mechanical connection can be a fixed mechanical connection, a detachable mechanical connection, or an integrated one; or, "connection" can be a direct connection or an indirect connection through an intermediate medium.
[0038] In the embodiments of the present application, the words "exemplarily" and the like are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplarily" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the words "exemplarily" and the like is intended to present the related concepts in a specific way.
[0039] In the drawings of the embodiments of the present application, components are represented by guide lines with arrows; parts are represented by guide lines only; hollow structures such as cavities and openings are represented by curved guide lines.
[0040] The present application embodiment provides an energy storage system 100. Figure 1 or Figure 2 As shown, the energy storage system 100 may include a battery pack 01 and a power converter 02 electrically connected to the battery pack 01. The power converter 02 is used to convert the voltage output by the battery pack and output it to the power grid 03 or the load 04, and / or to convert the voltage output by the external power supply and output it to the battery pack 01. Exemplarily, the power converter 02 is used to convert the voltage output by the battery pack 01 and output it to the power grid 03. Alternatively, the power converter 02 is used to convert the voltage output by the battery pack 01 and output it to the load 04. Alternatively, the power converter 02 is used to convert the voltage output by the external power supply and output it to the battery pack 01. Alternatively, the power converter 02 is used to convert the voltage output by the battery pack 01 and output it to the power grid 03 or the load 04, and the power converter 02 is also used to convert the voltage output by the external power supply and output it to the battery pack 01.
[0041] For example, the energy storage system 100 may be a photovoltaic system, a wind power generation system, a hydropower generation system, a geothermal power generation system, a new energy vehicle, etc.
[0042] The following description will be made by taking the above energy storage system 100 as a photovoltaic system as an example. Figure 1 As shown, the photovoltaic system may further include a photovoltaic module 05. The photovoltaic module 05 converts solar energy into electrical energy and sends it to the battery pack 01 for storage. In addition, the battery pack 01 converts the voltage into power through the power converter 02 and directly transmits it to the load 04, or transmits it to the load 04 through the power grid 03, to provide electrical energy for the operation of the load 04.
[0043] The following is an example of the energy storage system 100 being a new energy vehicle. Figure 2 As shown, the load 04 of the new energy vehicle may include any electrical device used for starting, driving or navigation of the new energy vehicle. The battery pack 01 provides electrical energy to the load 04, and the power converter 02 is used to convert the voltage output by the battery pack 01 into power and output it to the load 04 to meet the power demand of the new energy vehicle.
[0044] The above embodiment Figure 1 or Figure 2 As shown, the energy storage system 100 includes one battery pack 01 and one power converter 02. In other embodiments of the present application, the number of battery packs 01 and power converters 02 may also be other numbers.
[0045] The battery pack 01 in the energy storage system 100 in the above embodiment is as follows: Figure 3 As shown, a plurality of batteries 10 may be included. The plurality of batteries 10 may be connected in series or in parallel. A plurality of batteries 10 provide a higher voltage and capacity.
[0046] Continue as Figure 3 As shown, the battery pack 01 may further include a box body 20 and a box cover 30. The box body 20 and the box cover 30 are connected, and the battery 10 is arranged in the box body 20. The box body 20 and the box cover 30 limit and protect the battery 10.
[0047] Alternatively, in other embodiments of the present application, the above-mentioned battery pack 01 may also be composed of one battery 10.
[0048] The structure of the battery 10 is described in detail below. Figure 4 As shown, the battery 10 may include a cover plate 11, a battery cell 12, a shell 13, and an electrolyte (not shown in the figure). The battery cell 12 and the electrolyte are both disposed in the shell 13. The cover plate 11 is buckled on the shell 13 and is sealed with the shell 13. The shell 13 is used to accommodate the battery cell 12 and the electrolyte. The cover plate 11 isolates the inside of the shell 13 from the outside of the shell 13 to prevent leakage of the electrolyte.
[0049] like Figure 5 As shown, the cover plate 11 includes a plate body 111 and a pole 112. The plate body 111 is provided with a mounting hole 1111. The mounting hole 1111 is used to mount the pole 112. Fig. 6A As shown, the pole 112 includes two parts, one part 1121 passes through the mounting hole 1111, and the other part 1122 is located in the housing 13 (such as Figure 4 ) and connected to the battery cell 12 (as shown Figure 4 The pole ear 121 (as shown) Figure 4 The battery cell 12 transmits current to the outside through the pole 112; or, the current is transmitted to the battery cell 12 through the pole 112 to complete the charging and discharging of the battery. The plate body 111 can support the pole 112 and improve the working stability of the pole 112.
[0050] For example, the battery cell 12 may include a rolled core or a stacked core.
[0051] Further, continue as Figure 4 As shown, the pole 112 may include a positive pole 112A and a negative pole 112B. The tab 121 may include a positive pole tab 121C and a negative pole tab 121D. The positive pole tab 121C is connected to the power converter 02 (eg, Figure 1The negative electrode tab 121D is electrically connected to the power converter 02 through the negative electrode column 112B to achieve current conduction between the battery 10 and the power converter 02.
[0052] The structure of the cover plate 11 is further described below with examples. Figure 5 As shown, the cover plate 11 may further include a seal 113. The seal 113 is sleeved on the pole 112, and the seal 113 is arranged between the plate body 111 and the pole 112. The seal 113 ensures the sealing between the plate body 111 and the pole 112, and prevents the electrolyte from spraying out from between the plate body 111 and the pole 112.
[0053] To prevent the battery from exploding due to excessive pressure inside the battery. Figure 5 As shown, the cover plate 11 may further include an explosion-proof valve 114. The explosion-proof valve 114 is provided with notches, and when the pressure inside the battery is greater than the opening pressure of the explosion-proof valve 114, the notches of the explosion-proof valve 114 will be broken, thereby achieving the purpose of pressure relief.
[0054] During the battery charging and discharging operation, the current needs to be transmitted between the battery cell 12 and the pole 112. At this time, when the current flows through the pole 112 and the connection between the battery cell 12 and the pole 112, a thermal effect will be generated. And the resistance at the connection between the battery cell 12 and the pole 112 is large, and more heat is generated. Especially when the battery cell 12 has an external short circuit, overcharge, acupuncture, etc., a large amount of heat will be generated at the connection between the battery cell 12 and the pole 112. When there is no shielding between the seal 113 and the pole 112, a large amount of heat is transferred from the pole 112 to the seal 113 close to the pole 112, causing the seal 113 to be overheated, shrinking or hot-melting, thereby greatly reducing the sealing between the plate body 111 and the pole 112. At this time, the electrolyte may spray out from between the plate body 111 and the pole 112. Especially when the pressure inside the battery is too high, the explosion-proof valve 114 may not open normally, and the electrolyte will spray out from between the plate body 111 and the pole 112, causing the battery to malfunction. The sprayed electrolyte may even come into contact with other charged components, causing safety accidents such as battery fire.
[0055] In order to solve the above problems, Fig. 6A ( Figure 5As shown in the cross-sectional view obtained by cutting along O1-O2 after the components of the cover plate are assembled), the cover plate 11 may also include a heat insulating member 115. The heat insulating member 115 is arranged between the seal 113 and the pole 112. At this time, the heat insulating member 115 can block part of the heat of the pole 112 and reduce the heat transferred to the seal 113. In other words, the heat received by the seal 113 will also be reduced, making it less likely for the seal 113 to shrink or melt, thereby preventing the electrolyte from spraying out from between the plate body 111 and the pole 112, that is, the side of the pole 112, to avoid the sprayed electrolyte from contacting with the charged pole, bus, etc., causing battery fire and other safety accidents.
[0056] Exemplarily, the thermal conductivity of the thermal insulation 115 is smaller than that of the seal 113 , and therefore the thermal conductivity of the thermal insulation 115 is relatively poor, so as to ensure that the thermal insulation 115 can block part of the heat of the pole 112 and reduce the heat transferred to the seal 113 .
[0057] Continue as Fig. 6A As shown, the diameter of a portion 1121 of the pole 112 is smaller than the diameter of the other portion 1122. At this time, the diameter of the other portion 1122 of the pole 112 is larger. After the other portion 1122 of the pole 112 is electrically connected to the battery cell 12, the pole 112 and the battery cell 12 have a larger connection area, thereby improving the stability of the connection, and reducing the contact resistance between the pole 112 and the battery cell 12, thereby reducing the heat generated at the connection between the pole 112 and the battery cell 12.
[0058] For example, the other part 1122 of the pole 112 can be electrically connected to the battery cell 12 by welding.
[0059] As another example, one part 1121 and another part 1122 of the pole 112 may be an integrally formed part. For example, one part 1121 and another part 1122 of the pole 112 may be cast in one mold. Alternatively, one part 1121 and another part 1122 of the pole 112 may also be formed by cutting a blank. This application embodiment is not specifically limited.
[0060] In order to further reduce the heat transferred from the pole 112 to the seal 113, in some embodiments of the present application, continue as follows Fig. 6AAs shown, a heat insulating member 115 is provided between the other part 1122 of the pole 112 and the seal 113. Because the resistance at the connection between the battery cell 12 and the other part 1122 of the pole 112 is large, more heat is generated, and more heat will be transferred from the other part 1122 to the seal 113. At this time, the heat insulating member 115 provided between the other part 1122 of the pole 112 and the plate body 111 can block the transfer of more heat, thereby reducing the heat transferred to the seal 113. This is to prevent the seal 113 from shrinking or melting due to excessive heat.
[0061] In addition, continue as Fig. 6A As shown, the inner diameter of the heat insulating member 115 is equal to the inner diameter of the seal 113, and the outer diameter of the heat insulating member 115 is greater than or equal to the outer diameter of the seal 113. At this time, the heat insulating member 115 can completely separate the seal 113 from the other part 1122 of the pole 112, thereby improving the blocking effect of the heat transferred from the other part 1122 to the seal 113, further reducing the heat transferred to the seal 113, so as to avoid shrinkage or hot melting of the seal 113 due to excessive heat.
[0062] Continue as Fig. 6A As shown, the sealing member 113 may be disposed between the surface of the other portion 1122 of the plate body 111 facing the pole 112 and the heat insulating member 115. Alternatively, as Figure 6B As shown, the seal 113 can also be disposed between the plate 111 and a portion 1121 of the pole 112. At this time, the heat insulating member 115 can block the heat transferred from the pole 112 to the seal 113, reduce the heat transferred to the seal 113, and avoid shrinkage or thermal melting of the seal 113 due to excessive heat.
[0063] Alternatively, in other embodiments of the present application, Figure 7 ( Figure 5 As shown in the cross-sectional view obtained by cutting along O1-O2 after the components of the cover plate in the figure are assembled, a heat insulating member 115 is sleeved on the outer periphery of a portion 1121 of the pole 112, and a sealing member 113 is sleeved on the outer periphery of the heat insulating member 115. At this time, the heat insulating member 115 can reduce the heat transferred from the portion 1121 to the sealing member 113, so as to avoid shrinkage or heat melting of the sealing member 113 due to excessive heat.
[0064] In addition, in order to ensure the sealing between the plate body 111 and the pole 112, as shown in FIG. Fig. 6A or Figure 7In any of the embodiments shown, the plate body 111, the pole 112 and the heat insulating member 115 can all abut against the seal 113. After the seal 113 abuts against the plate body 111, the pole 112 and the heat insulating member 115, the plate body 111, the pole 112 and the heat insulating member 115 can all generate a supporting force on the seal 113, thereby ensuring that the seal 113 fits tightly with the plate body 111 and the pole 112, thereby ensuring that the plate body 111 and the pole 112 can be relatively sealed through the seal 113.
[0065] It is understandable that the abutment may be direct abutment or indirect abutment, wherein the indirect abutment may be abutment through a sealant provided between the sealing member 113 and the plate body 111 , the pole 112 and the heat insulating member 115 .
[0066] In order to ensure the sealing between the plate body 111 and the pole 112 and reduce the heat transferred from the pole 112 to the seal 113, as shown in FIG. Fig. 6A or Figure 7 In any of the embodiments shown, the contact area between the seal 113 and the heat insulating member 115 may be larger than the contact area between the seal 113 and the pole 112. On the basis of ensuring that the seal 113 can be greatly deformed and the sealing performance is guaranteed, the contact area between the seal 113 and the pole 112 is small, and the heat transferred to the seal 113 through the contact portion between the seal 113 and a portion 1121 of the pole 112 is small, further preventing the seal 113 from shrinking or hot melting.
[0067] For example, Figure 7 In the illustrated embodiment, the radial cross section of the seal 113 may be L-shaped, and the short side end surface of the seal 113 abuts against a portion 1121. The long side of the seal 113 abuts against the heat insulating member 115. In this way, while ensuring the sealing performance between the plate 111 and the pole 112, the abutment area between the seal 113 and the pole 112 is reduced, thereby reducing the heat transferred to the seal 113.
[0068] In order to ensure the thermal stability and heat-blocking performance of the thermal insulation member 115, Figure 5 , Fig. 6A , Figure 6B or Figure 7In any of the embodiments shown, the material of the thermal insulation 115 can be a thermal insulation material or a flame retardant material. Exemplarily, the material of the thermal insulation 115 can be a thermal insulation material such as ceramic, aerogel, high temperature resistant composite material, etc. Among them, aerogel can include silicon aerogel, carbon aerogel, metal oxide aerogel, etc. The embodiment of the present application is not specifically limited. Also exemplarily, the material of the thermal insulation 115 can be a flame retardant material such as antimony trioxide, magnesium hydroxide, aluminum hydroxide, hydrated zinc borate, etc. The thermal insulation 115 using the above materials has a high high temperature resistance, thereby ensuring the thermal stability of the thermal insulation 115 during operation. In addition, the thermal conductivity of the thermal insulation 115 is poor, thereby reducing the heat transferred from the pole 112 to the seal 113 through the thermal insulation 115.
[0069] The above embodiments are all examples of the cover plate 11 including a heat insulating member 115. In other embodiments of the present application, in order to further reduce the heat transferred from the pole 112 to the seal 113, at least two heat insulating members 115 are stacked between the seal 113 and the pole 112. For example, Figure 8 As shown, the number of the heat insulating members 115 can be two. The two heat insulating members 115 hinder the heat transfer between the pole 112 and the seal 113, and further reduce the heat transferred to the seal 113. This prevents the seal 113 from shrinking or melting due to excessive heat.
[0070] It is understandable that at least two heat insulating members 115 may be provided between the positive electrode column 112A and the corresponding seal 113 ; and at least two heat insulating members 115 may also be provided between the negative electrode column 112B and the corresponding seal 113 .
[0071] Furthermore, if Figure 5 , Fig. 6A , Figure 6B or Figure 7In any of the embodiments shown, the cover plate 11 may further include an upper plastic part 116 and a lower plastic part 117. The upper plastic part 116 is filled and arranged between the plate body 111 and the pole 112, and is located on the side of the seal 113 away from the battery cell 12. The lower plastic part 117 is arranged between the plate body 111 and the battery cell 12, a part of the lower plastic part 117 is arranged between the plate body 111 and the pole 112, and the part of the lower plastic part 117 is located on the side of the seal 113 facing the battery cell 12. Among them, the material of the upper plastic part 116 and the material of the lower plastic part 117 are both insulating materials. By the upper plastic part 116 and part of the lower plastic part 117 arranged between the plate body 111 and the pole 112, the pole 112 and the plate body 111 are insulated from each other, thereby preventing the current on the pole 112 from being conducted to the plate body 111, thereby causing a short circuit. In addition, the lower plastic member 117 insulates the board 111 and the battery core 12 from each other, thereby preventing the current on the battery core 12 from being conducted to the board 111 and causing a short circuit.
[0072] It is understandable that the upper plastic part 116 may also have a first through hole 1161, and the lower plastic part 117 may also have a second through hole 1171, and one end of the pole 112 passes through the second through hole 1171, the mounting hole 1111, and the first through hole 1161 in sequence. Figure 4 The other end of the pole 112 is located outside the housing 13 and can be connected to the power converter 02 (as shown in FIG. Figure 1 As shown), the battery and the power converter 02 are electrically connected so that conduction can occur between the battery and the power converter 02.
[0073] Further, continue as Figure 5 As shown, the plate body 111 may be provided with an upper injection hole 1112 , and the lower plastic part 117 may be provided with a lower injection hole 1172 . The upper injection hole 1112 is communicated with the lower injection hole 1172 , and electrolyte may be injected into the shell 13 through the upper injection hole 1112 and the lower injection hole 1172 .
[0074] In addition, continue Figure 5 As shown, the plate body 111 may further be provided with a groove 1113 on the peripheral side of the mounting hole 1111 which is away from the battery cell 12. The groove 1113 is used to accommodate the upper plastic part 116 and can limit the upper plastic part 116 in radial direction.
[0075] The above is an example of the battery 10 in which the cover plate 11 of the battery 10 includes the sealing member 113 and the heat insulating member 115. In other embodiments of the present application, in order to prevent the electrolyte from spraying out from between the plate body 111 and the pole 112, that is, the side around the pole 112, Figure 4 In the battery 10 shown, the cover plate 11 of the battery 10 can also be Fig. 9 As shown. The cover plate 11 may include a plate body 111, a pole 112 and a flame retardant seal 118. The plate body 111 is provided with a mounting hole 1111, and the mounting hole 1111 is used to mount the pole 112. The pole 112 is connected to the battery cell 12 (such as Figure 4 The pole ear 121 (as shown) Figure 4 As shown) electrical connection. Fig.10 ( Fig. 9 As shown in the cross-sectional view obtained by cutting along P1-P2 after the components of the cover plate are assembled, a flame retardant seal 118 is provided on the outer periphery of the pole 112. The plate body 111 and the pole 112 can be sealed by the flame retardant seal 118. Moreover, the flame retardant seal 118 has good high temperature resistance and is not prone to shrinkage or heat melting due to heat. This is to avoid the flame retardant seal 118 from shrinking or melting due to excessive heat, which may cause the electrolyte to spray out from between the plate body 111 and the pole 112, and to avoid safety accidents such as battery fire caused by the contact of the sprayed electrolyte with the charged pole, bus, etc.
[0076] Exemplarily, the material of the flame retardant seal 118 is flame retardant rubber. The flame retardant rubber can be a rubber material with flame retardant added. Exemplarily, the flame retardant includes at least one of silicon dioxide, magnesium oxide, magnesium hydroxide, antimony trioxide, chlorinated paraffin, tricresyl phosphate, etc.; the rubber material can be at least one of chloroprene rubber, chlorosulfonated polyethylene, polyvinyl chloride, silicone rubber, etc. Exemplarily again, the flame retardant rubber can be a rubber material with silicon dioxide added, a rubber material with magnesium oxide and magnesium hydroxide added, or a rubber material with magnesium oxide and antimony trioxide added. The flame retardant seal 118 made of this material has good high temperature resistance and is not easy to shrink or melt due to heat.
[0077] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A battery, characterized in that: It comprises a cover plate and a shell, wherein the shell is used to accommodate the battery cell, and the cover plate is buckled on the shell; The cover plate includes a plate body, a pole, a seal and a heat insulating member; a mounting hole is opened on the plate body, and the mounting hole is used to install the pole; the pole includes two parts, one part passes through the mounting hole, and the other part is located in the shell and electrically connected to the pole ear of the battery cell; the seal is sleeved on the pole, and the seal is arranged between the plate body and the pole; the heat insulating member is arranged between the seal and the pole.
2. The battery according to claim 1, characterized in that The diameter of one of the parts is smaller than the diameter of the other part, a sealing member is sleeved around the outer periphery of the one of the parts, and the heat insulating member is arranged between the other part and the sealing member.
3. The battery according to claim 2, characterized in that The inner diameter of the heat insulating member is equal to the inner diameter of the sealing member, and the outer diameter of the heat insulating member is greater than or equal to the outer diameter of the sealing member.
4. The battery according to claim 1, characterized in that The outer periphery of one of the parts is provided with the heat insulating component, and the outer periphery of the heat insulating component is provided with the sealing component.
5. The battery according to any one of claims 1 to 4, characterized in that: The plate body, the pole and the heat insulating member are all in contact with the sealing member, and the contact area between the sealing member and the heat insulating member is larger than the contact area between the sealing member and the pole.
6. The battery according to any one of claims 1 to 4, characterized in that: The material of the thermal insulation element is thermal insulation material or flame retardant material.
7. The battery according to any one of claims 1 to 4, characterized in that: At least two heat insulating members are stacked between the sealing member and the pole.
8. A cover plate, characterized in that: It includes a plate body, a pole, a seal and a heat insulating member; the plate body is provided with a mounting hole, the mounting hole is used to mount the pole, the pole includes two parts, one part passes through the mounting hole, and the other part is used to be electrically connected to the pole ear of the battery cell, the seal is sleeved on the pole, the seal is arranged between the plate body and the pole, and the heat insulating member is arranged between the seal and the pole.
9. A battery, characterized in that: It comprises a cover plate and a shell, wherein the shell is used to accommodate the battery cell, and the cover plate is buckled on the shell; The cover plate includes a plate body, a pole and a flame retardant seal; the plate body is provided with a mounting hole, the mounting hole is used to mount the pole, the pole is electrically connected to the pole lug of the battery cell, and the outer periphery of the pole is sleeved with a flame retardant seal.
10. The battery according to claim 9, characterized in that The material of the flame retardant seal is flame retardant rubber.
11. A cover plate, characterized in that: It includes a plate body, a pole, a seal and a heat insulation member; the plate body is provided with a mounting hole, the mounting hole is used to install the pole, the pole is used to be electrically connected to the pole ear of the battery cell, and the outer periphery of the pole is provided with a flame retardant seal.
12. A battery pack, characterized in that: The battery pack comprises a plurality of batteries according to any one of claims 1 to 7 or any one of claims 9 to 10, and the plurality of batteries are connected in series or in parallel.
13. An energy storage system, characterized in that: The energy storage system includes a power converter and at least one battery pack as described in claim 12; the power converter is used to convert the voltage output by the battery pack into power and output it to a power grid or a load, and / or to convert the voltage output by an external power supply into power and output it to the battery pack.