Steel shell battery and energy storage device
By adopting the integrated structure of steel shell and cladding shell, the problem of small capacity of existing lithium batteries is solved, and high-strength, low-cost and large-capacity steel shell batteries are realized, suitable for energy storage devices.
Patent Information
- Application Number
- CN202421927750.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The existing lithium batteries use aluminum shells, which are costly and have poor hardness, resulting in a small capacity of lithium batteries, making it difficult to meet the capacity requirements in energy storage devices.
Using a steel-shell battery, the sealing welding steps are simplified and the packaging efficiency is improved by setting both the top cover and the bottom shell as a steel shell, combining the design of the cladding shell and the bottom plate as an integrated structure.
It realizes the high strength, low cost and safety and reliability of steel-shell batteries. At the same time, while ensuring strength, the wall thickness is as thin as possible, increasing the battery capacity and having good economic benefits.
Smart Images
Figure CN223006814U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lithium-ion battery manufacturing, and particularly to a steel shell battery and an energy storage device. Background Art
[0002] The global new energy (such as wind, light, and water) industry has developed rapidly, and energy storage technology is of great significance to the development of the new energy industry. Lithium batteries have the advantages of high energy storage density, high specific energy, fast charging, long cycle life, safety, and environmental protection. They are one of the important carriers for energy storage and are widely used in portable electronic products, new energy vehicles, and energy storage power station systems.
[0003] Currently, many lithium batteries use aluminum casings. However, the cost of aluminum casings is relatively high and the hardness is poor. In order to ensure the structural strength of lithium batteries, it is necessary to ensure a relatively large thickness of the aluminum casing, resulting in a relatively small capacity of lithium batteries.
[0004] For the energy storage device in the energy storage power station system, there is an urgent need for a battery with a relatively large capacity. Summary of the Utility Model
[0005] The embodiments of this application provide a steel shell battery and an energy storage device. It can solve the problem that there is an urgent need for a relatively large capacity for energy storage devices in the prior art. The technical solutions are as follows:
[0006] On the one hand, a steel shell battery is provided, and the steel shell battery includes:
[0007] A bottom shell, a top cover, an electric core, a first pole column, and a second pole column;
[0008] The bottom shell includes: a covering shell and a bottom plate. The covering shell is located on one side of the bottom plate and is distributed around the edge of the bottom plate. The covering shell and the bottom plate are an integral structure. The covering shell and the bottom plate are used to enclose a containing cavity and an opening communicating with the containing cavity;
[0009] The electric core is installed in the containing cavity. The electric core has a first pole tab and a second pole tab, and both the first pole tab and the second pole tab are exposed from the opening;
[0010] The top cover is fixed at the opening and is disposed opposite to the bottom plate;
[0011] Both the first pole column and the second pole column are connected to the top cover, and the first pole column is electrically connected to the first pole tab, and the second pole column is electrically connected to the second pole tab.
[0012] Optionally, the covering shell includes: two first side plates disposed opposite to each other and two second side plates disposed opposite to each other. The first side plates and the second side plates are connected end to end in sequence;
[0013] Wherein, the area of the first side plate is less than or equal to the area of the second side plate, and the area of the top cover is less than the area of the first side plate.
[0014] Optionally, the shape of the top cover matches the shape of the opening, and the outer side surface of the top cover is flush with the outer side surface of the coating shell.
[0015] Optionally, the top cover has a liquid injection hole and an explosion-proof hole arranged adjacent to each other, and the steel shell battery further includes: a seal fixed at the liquid injection hole, and an explosion-proof sheet fixed at the explosion-proof hole.
[0016] Optionally, the seal is a structure made of steel.
[0017] Optionally, the explosion-proof sheet is a sheet-like structure made of steel.
[0018] Optionally, the steel shell battery further includes: a first protective film connected to the outer side surface of the bottom shell facing away from the accommodation cavity, and / or a second protective film connected to the outer side surface of the top cover facing away from the accommodation cavity.
[0019] Optionally, the outer side surface of the bottom shell facing away from the accommodation cavity has a first reinforcing rib, and / or the outer side surface of the top cover facing away from the accommodation cavity has a second reinforcing rib.
[0020] Optionally, the first tab is a positive tab and the second tab is a negative tab.
[0021] On the other hand, an energy storage device is provided, and the energy storage device includes:
[0022] A plurality of steel shell batteries arranged in an array, and the steel shell battery is any one of the above-mentioned steel shell batteries.
[0023] The beneficial effects brought by the technical solution provided by the embodiments of the present application at least include:
[0024] A steel shell battery may include: a bottom shell, a top cover, an electric core, a first pole column and a second pole column. By setting both the top cover and the bottom shell of the steel shell battery as steel shells, it has the advantages of higher strength, lower cost, and greater safety and reliability compared with aluminum shells. In addition, while ensuring the strength of the steel shell battery, the wall thickness of the steel shell battery can be made as thin as possible, so that the capacity of the steel shell battery is larger. After applying this steel shell battery to the energy storage device, since the energy storage device requires a large number of batteries, using this steel shell battery has better economic benefits. In addition, since the coating shell and the bottom plate in the bottom shell of the steel shell battery can be an integral structure, when sealing the steel shell battery, only the top cover and the bottom shell need to be sealed and welded, which simplifies the packaging steps of the steel shell battery, improves the packaging efficiency of the steel shell battery, and can further ensure that the bottom shell has higher strength. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0026] Figure 1 is a schematic structural diagram of a steel shell battery provided by an embodiment of the present application;
[0027] Figure 2 is Figure 1 an exploded view of the steel shell battery shown;
[0028] Figure 3 is Figure 1 a front view of the steel shell battery shown;
[0029] Figure 4 is a schematic structural diagram of another steel shell battery provided by an embodiment of the present application;
[0030] Figure 5 is a schematic structural diagram of yet another steel shell battery provided by an embodiment of the present application;
[0031] Figure 6 is a top view of a steel shell battery provided by an embodiment of the present application;
[0032] Figure 7 is a schematic structural diagram of an energy storage device provided by an embodiment of the present application.
[0033] Through the above drawings, the specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0034] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the drawings.
[0035] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 is a schematic structural diagram of a steel shell battery provided by an embodiment of the present application, Figure 2 is Figure 1 an exploded view of the steel shell battery shown, Figure 3 is Figure 1Front view of the shown steel shell battery. For example, the steel shell battery can be a lithium energy storage battery or other forms of energy storage batteries and can be applied in energy storage devices. The steel shell battery 000 can include: a bottom shell 100, a top cover 200, an electrode core 300, a first pole column 400, and a second pole column 500.
[0036] The bottom shell 100 in the steel shell battery 000 can include: a cladding shell 101 and a bottom plate 102. The cladding shell 101 can be located on one side of the bottom plate 102 and can be distributed around the edge of the bottom plate 102. The cladding shell 101 and the bottom plate 102 in the bottom shell 100 can be an integral structure. The cladding shell 101 and the bottom plate 102 can be used to enclose a receiving cavity a1 and an opening a2 communicating with the receiving cavity.
[0037] The electrode core 300 in the steel shell battery 000 can be installed in the receiving cavity a1 in the bottom shell 100. The electrode core 300 can have a first pole ear and a second pole ear (not shown in the figure), and the first pole ear and the second pole ear can be exposed from the opening a2 of the bottom shell 100.
[0038] The top cover 200 in the steel shell battery 000 can be covered on the opening a2 of the bottom shell 100 and can be disposed opposite to the bottom plate 102. Here, the top cover 200 can be fixed at the opening a2 of the bottom shell 100. For example, the top cover 200 and the bottom shell 100 can be fixedly connected by welding.
[0039] Both the first pole column 400 and the second pole column 500 in the steel shell battery 000 can be connected to the top cover 200. The first pole column 400 can be electrically connected to the first pole ear, and the second pole column 500 can be electrically connected to the second pole ear. For example, the first pole ear in the electrode core 300 can be a positive pole ear, and the second pole ear can be a negative pole ear. Here, the first pole column 400 and / or the second pole column 500 can be insulated from the top cover 200.
[0040] In the embodiments of the present application, by setting both the top cover 200 and the bottom case 100 in the steel shell battery 000 as steel shells, it has the advantages of higher strength, lower cost, and greater safety and reliability compared to aluminum shells. Additionally, while ensuring the strength of the steel shell battery 000, the wall thickness of the steel shell battery 000 can be made as thin as possible, resulting in a larger capacity of the steel shell battery 000. And after applying this steel shell battery to an energy storage device, since the energy storage device requires a large number of batteries, using this steel shell battery has better economic benefits. Moreover, since the cladding shell 101 and the bottom plate 102 in the bottom case 100 of the steel shell battery 000 can be an integral structure, during the sealing process of the steel shell battery 000, only the top cover 200 and the bottom case 100 need to be sealed and welded, simplifying the packaging steps of the steel shell battery 000, improving the packaging efficiency of the steel shell battery 000, and further ensuring that the bottom case 100 has higher strength.
[0041] It should be noted that the bottom case 100 in the steel shell battery 000 can be integrally formed by forging or casting processes.
[0042] In summary, the embodiments of the present application provide a steel shell battery, which may include: a bottom case, a top cover, a battery cell, a first pole column, and a second pole column. By setting both the top cover and the bottom case in the steel shell battery as steel shells, it has the advantages of higher strength, lower cost, and greater safety and reliability compared to aluminum shells. Additionally, while ensuring the strength of the steel shell battery, the wall thickness of the steel shell battery can be made as thin as possible, resulting in a larger capacity of the steel shell battery. After applying this steel shell battery to an energy storage device, since the energy storage device requires a large number of batteries, using this steel shell battery has better economic benefits. Moreover, since the cladding shell and the bottom plate in the bottom case of the steel shell battery can be an integral structure, during the sealing process of the steel shell battery, only the top cover and the bottom case need to be sealed and welded, simplifying the packaging steps of the steel shell battery, improving the packaging efficiency of the steel shell battery, and further ensuring that the bottom case has higher strength.
[0043] Optionally, please refer to Figure 4 , Figure 4It is a schematic structural diagram of another steel shell battery provided by an embodiment of the present application. The encapsulation shell 101 may include: two first side plates 101a arranged oppositely and two second side plates 101b arranged oppositely, and the first side plates 101a and the second side plates 101b may be connected end to end in sequence. Among them, the shape of the top cover 200 in the steel shell battery 000 may match the shape of the opening a2 of the bottom shell 100. The area of the first side plate 101a may be less than or equal to the area of the second side plate 101b, and the area of the top cover 200 may be less than the area of the first side plate 101a. In this case, by setting the shape of the top cover 200 to match the shape of the opening a2 of the bottom shell 100, the area of the first side plate 101a in the encapsulation shell 101 is less than or equal to the area of the second side plate 101b, and the area of the top cover 200 is less than the area of the first side plate 101a. Thus, during the process of hermetically connecting the top cover 200 to the first side plate 101a and the second side plate 101b in the encapsulation shell 101, the connection area between the top cover 200 and the encapsulation shell 101 can be effectively reduced. For example, when the top cover 200 and the bottom shell 100 are fixedly connected by welding, the welding area between the top cover 200 and the bottom shell 100 can be effectively reduced, the welding cost can be reduced, and the welding efficiency can be improved. For example, both the first side plate 101a and the second side plate 101b in the encapsulation shell 101 may be square, and both the first side plate 101a and the second side plate 101b may be perpendicularly arranged with respect to the bottom plate 102 respectively, that is, the steel shell composed of the top cover 200 and the bottom shell 100 in the steel shell battery 000 may be a square shell.
[0044] It should be noted that here the shape of the top cover 200 matches the shape of the opening a2 of the bottom shell 100, that is, the shape of the outer boundary of the top cover 200 may be the same as the shape of the opening a2.
[0045] In the embodiment of the present application, as Figure 4 shown, the shape of the top cover 200 in the steel shell battery 000 may match the shape of the opening a2 of the bottom shell 100, and the side surface of the top cover 200 may be flush with the outer side surface of the encapsulation shell 101. In this case, by setting the side surface of the top cover 200 to be flush with the outer side surface of the encapsulation shell 101, thus, when multiple steel shell batteries 000 are integrated in the energy storage device, the distance between adjacent two steel shell batteries 000 can be ensured to be small, and further it can be ensured that more steel shell batteries 000 can be arranged within the platform of the energy storage device, further ensuring the economic benefits of the energy storage device. It should be noted that in other possible implementation manners, the outer edge of the top cover 200 may also protrude from the edge of the opening a2 of the bottom shell 100.
[0046] Optionally, as Figure 4As shown, the top cover 200 may have an adjacent liquid injection hole b1 and an explosion-proof hole b2. The steel shell battery 000 may further include: a seal 600 fixed in the liquid injection hole b1 of the top cover 200, and an explosion-proof sheet 700 fixed at the explosion-proof hole b2 of the top cover 200. In this way, the liquid injection hole b1 and the explosion-proof hole b2 are respectively arranged on the top cover 200. Through the liquid injection hole b1, the electrolyte can be injected into the accommodation cavity a1 of the bottom case 100, and the first pole piece and the second pole piece in the battery cell 300 can be immersed in the electrolyte. When the steel shell battery 000 works, the first pole piece and the second pole piece in the battery cell 300 generate ion migration through the electrolyte to achieve charging and discharging. In addition, when the battery cell 300 is subjected to formation treatment, the excess electrolyte can be discharged through the liquid injection hole, and the gas generated during the formation treatment can also be discharged. After the formation treatment of the battery cell is completed, the liquid injection hole b1 is blocked by the seal 600. During the normal use of the battery, the explosion-proof sheet 700 can seal the explosion-proof hole b2 to prevent the inside of the battery from being affected by the outside. When the pressure inside the battery reaches the threshold value, the explosion-proof sheet 700 will burst to release the pressure, ensuring the safety of battery use.
[0047] In the present application, the seal 600 in the steel shell battery 000 may be a structure made of steel, that is, the material of the seal 600 may be the same as the material of the top cover 200. In this case, by setting the material of the seal 600 to be the same as the material of the top cover 200, that is, the seal 600 can also be made of steel, thus, the manufacturing cost of the steel shell battery 000 can be further reduced and the strength of the seal 600 can be ensured to be better. Exemplarily, the seal 600 may be a sealing nail.
[0048] In the present application, the explosion-proof sheet 700 in the steel shell battery 000 may be a sheet-like structure made of steel. In this case, by setting the material of the explosion-proof sheet 700 to be the same as the material of the top cover 200, that is, the explosion-proof sheet 700 can also be made of steel, thus, the manufacturing cost of the steel shell battery 000 can be further reduced and the strength of the explosion-proof sheet 700 can be ensured to be better.
[0049] In the embodiment of the present application, please refer to Figure 5 and Figure 6 , Figure 5 is a schematic structural diagram of another steel shell battery provided by the embodiment of the present application, Figure 6It is a top view of a steel shell battery provided by an embodiment of the present application. The steel shell battery 000 may further include: a first protective film 800 connected to the outer side of the bottom shell 100 facing away from the accommodation cavity a1, and / or a second protective film 900 connected to the outer side of the top cover 200 facing away from the accommodation cavity a1. Exemplarily, in an optional implementation manner, the steel shell battery 000 may include: a first protective film 800 connected to the outer side of the bottom shell 100 facing away from the accommodation cavity a1 of the steel shell battery 000. Through this first protective film 800, good anti-corrosion and insulation effects can be achieved on the bottom shell 100 in the steel shell battery 000. In another optional implementation manner, the steel shell battery 000 may include: a second protective film 900 connected to the outer side of the top cover 200 facing away from the accommodation cavity a1 of the steel shell battery. Through this second protective film 900, good anti-corrosion and insulation effects can be achieved on the top cover 200 in the steel shell battery. In still another optional implementation manner, the steel shell battery 000 may include: a first protective film 800 connected to the outer side of the bottom shell 100 facing away from the accommodation cavity a1 of the steel shell battery 000, and a second protective film 900 connected to the outer side of the top cover 200 facing away from the accommodation cavity a1 of the steel shell battery. Exemplarily, the first protective film 800 and / or the second protective film 900 may include a polyethylene terephthalate (English: polyethylene terephthalate; abbreviation: PET) PET substrate + PSA adhesive film layer structure, or a PC insulating top patch, or a sprayed insulating material.
[0050] Optionally, the outer side of the bottom shell 100 in the steel shell battery 000 facing away from the accommodation cavity a1 may have a first reinforcing rib (not shown in the figure), and / or the outer side of the top cover 200 facing away from the accommodation cavity a1 may have a second reinforcing rib (not shown in the figure). In this case, by providing a first reinforcing rib on the outer side of the bottom shell 100, and / or a second reinforcing rib on the outer side of the top cover 200, in this way, the anti-deformation ability and pressure resistance of the steel shell battery 000 can be further improved, and the safety and reliability of the steel shell battery 000 are further ensured.
[0051] In summary, the embodiments of the present application provide a steel shell battery, which may include: a bottom shell, a top cover, an electrode core, a first pole column, and a second pole column. By setting both the top cover and the bottom shell of the steel shell battery as steel shells, it has the advantages of higher strength, lower cost, and greater safety and reliability compared with aluminum shells. In addition, while ensuring the strength of the steel shell battery, the wall thickness of the steel shell battery can be made as thin as possible, so that the capacity of the steel shell battery is relatively large. After applying this steel shell battery to an energy storage device, since the energy storage device requires a large number of batteries, using this steel shell battery has better economic benefits. In addition, since the cladding shell and the bottom plate in the bottom shell of the steel shell battery can be an integral structure, during the sealing process of the steel shell battery, only the top cover and the bottom shell need to be sealed and welded, which simplifies the packaging steps of the steel shell battery, improves the packaging efficiency of the steel shell battery, and can further ensure that the bottom shell has higher strength.
[0052] The embodiments of the present application also provide an energy storage device. Please refer to Figure 7 , Figure 7 which is a schematic structural diagram of an energy storage device provided by the embodiments of the present application. The energy storage device 00 may include: a plurality of steel shell batteries 000 arranged in an array, and the steel shell battery 000 may be any of the steel shell batteries 000 given above. In this way, by integrating a plurality of steel shell batteries arranged in an array in the energy storage device, and setting both the top cover and the bottom shell of the steel shell battery as steel shells, it has the advantages of higher strength, lower cost, and greater safety and reliability compared with aluminum shells. In addition, while ensuring the strength of the steel shell battery, the wall thickness of the steel shell battery can be made as thin as possible, so that the capacity of the steel shell battery is relatively large. After applying this steel shell battery to an energy storage device, since the energy storage device requires a large number of batteries, using this steel shell battery has better economic benefits. In addition, since the cladding shell and the bottom plate in the bottom shell of the steel shell battery can be an integral structure, during the sealing process of the steel shell battery, only the top cover and the bottom shell need to be sealed and welded, which simplifies the packaging steps of the steel shell battery, improves the packaging efficiency of the steel shell battery, and can further ensure that the bottom shell has higher strength.
[0053] It should be noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Moreover, it can be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be an intermediate layer. In addition, it can be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element, or there may be more than one intermediate layer or element. In addition, it can also be understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Like reference numerals throughout indicate like elements.
[0054] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.
[0055] The above are only optional embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.
Claims
1. A steel shell battery, characterized in that: include: Bottom shell, top cover, battery cell, first pole and second pole; The bottom shell comprises: a covering shell and a bottom plate, wherein the covering shell is located on one side of the bottom plate and is distributed around the edge of the bottom plate, the covering shell and the bottom plate are an integral structure, and the covering shell and the bottom plate are used to enclose a receiving cavity and an opening communicating with the receiving cavity; The battery cell is installed in the accommodating cavity, and the battery cell has a first pole lug and a second pole lug, and the first pole lug and the second pole lug are both exposed from the opening; The top cover is fixed at the opening and arranged opposite to the bottom plate; The first pole and the second pole are both connected to the top cover, and the first pole is electrically connected to the first pole tab, and the second pole is electrically connected to the second pole tab.
2. The steel shell battery according to claim 1, characterized in that: The covering shell comprises: two first side plates arranged opposite to each other and two second side plates arranged opposite to each other, wherein the first side plates and the second side plates are connected end to end in sequence; The shape of the top cover matches the shape of the opening, the area of the first side panel is smaller than or equal to the area of the second side panel, and the area of the top cover is smaller than the area of the first side panel.
3. The steel shell battery according to claim 1, characterized in that: The shape of the top cover matches the shape of the opening, and the side surface of the top cover is flush with the outer side surface of the covering shell.
4. The steel shell battery according to any one of claims 1 to 3, characterized in that: The top cover has a liquid injection hole and an explosion-proof hole arranged adjacent to each other, and the steel shell battery further includes: a sealing member fixed in the liquid injection hole, and an explosion-proof plate fixed at the explosion-proof hole.
5. The steel shell battery according to claim 4, characterized in that: The sealing member is a structure made of steel.
6. The steel shell battery according to claim 4, characterized in that: The explosion-proof disk is a sheet-like structure made of steel.
7. The steel shell battery according to any one of claims 1-3, 5-6, characterized in that: The steel shell battery further includes: a first protective film connected to the outer side of the bottom shell away from the accommodating cavity, and / or a second protective film connected to the outer side of the top cover away from the accommodating cavity.
8. The steel shell battery according to any one of claims 1-3, 5-6, characterized in that: The outer side surface of the bottom shell facing away from the accommodating cavity has a first reinforcing rib, and / or the outer side surface of the top cover facing away from the accommodating cavity has a second reinforcing rib.
9. The steel shell battery according to any one of claims 1-3, 5-6, characterized in that: The first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab.
10. An energy storage device, characterized in that: include: A plurality of steel shell batteries arranged in an array, wherein the steel shell battery is the steel shell battery described in any one of claims 1 to 9.