Square aluminum can battery

Abstract

The utility model provides square aluminium shell battery, including first core package, second core package, insulating connection structure, apron, pole and aluminium shell, first core package and second core package are all same side setting tab, and the tab includes the positive pole lug and negative pole lug who have parallel, insulating connection structure includes the backing pad, the connecting piece and the bottom support, the backing pad and the bottom support are parallel to each other, and are connected respectively opposite in the both ends of connecting piece, and extend to both sides, the backing pad is provided with the conductive metal plate, the connecting piece is clamped between first core package and second core package, the backing pad is pressed between the tab and the core package end face, the bottom support cooperates the backing pad and clamps the bottom of first core package and second core package, the pole and the tab and the conductive metal plate are welded, the aluminium shell contains first core package and second core package, the apron presses first core package and second core package exposed part, and is welded with aluminium shell all round. The utility model can optimize square aluminium shell battery internal space structure, improve the energy density of electric core.

Description

Technical Field

[0001] This utility model relates to the field of sodium-ion and lithium-ion square battery technology, and in particular to a battery that can optimize the internal spatial structure of a square aluminum-cased battery and improve the energy density of the cell. Background Technology

[0002] Sodium-ion and lithium-ion square aluminum-cased batteries are both important types in the battery field. Both types consist of a positive electrode, a negative electrode, a separator, an electrolyte, an aluminum casing, and a top cover. The positive and negative electrodes are where the electrochemical reaction occurs. The separator isolates the positive and negative electrodes to prevent short circuits, the electrolyte acts as a medium for ion transport, and the aluminum casing and top cover provide protection and sealing. Lithium-ion batteries store and release energy based on the migration of lithium ions between the positive and negative electrodes. During charging, lithium ions are released from the positive electrode, pass through the electrolyte, and embed into the negative electrode; during discharging, lithium ions are released from the negative electrode and return to the positive electrode. Sodium-ion batteries work on a similar principle to lithium-ion batteries, except that sodium ions participate in the reaction. Sodium-ion square aluminum-cased batteries benefit from abundant sodium resources and lower cost. They offer high safety, with a higher thermal runaway temperature than lithium-ion batteries, and are more stable under overcharge, over-discharge, and short-circuit conditions. They also exhibit good performance over a wide temperature range, maintaining good charge and discharge efficiency in both high and low temperature environments. Long cycle life, with some products reaching thousands or even tens of thousands of cycles. Lithium-ion square aluminum-cased batteries: High energy density, storing more energy in a smaller volume and weight, meeting the needs of devices or vehicles with high range requirements. High charge and discharge efficiency, good power performance, enabling fast charging and high-current discharge. Low self-discharge rate, the battery loses power slowly when not in use, maintaining its charge for a long time. Sodium-ion square aluminum-cased batteries are suitable for cost-sensitive large-scale energy storage fields, such as grid energy storage and distributed energy storage, enabling the storage and regulation of renewable energy. They can also be used in some low-temperature environments, such as outdoor energy storage equipment and power tools in cold regions. Lithium-ion square aluminum-cased batteries are widely used in electric vehicles, electric motorcycles, and other new energy transportation vehicles to provide power support. They also dominate in portable electronic devices such as mobile phones, tablets, and laptops.

[0003] Currently, the structure of lithium / sodium-ion prismatic batteries, both domestically and internationally, basically adopts a conventional dual-cell design where the tabs are welded onto a connecting piece, which is then connected to the cover plate and terminal post. This design has several drawbacks: 1) the bent connecting piece occupies some internal space, resulting in low space utilization; 2) the battery has low energy density.

[0004] Therefore, optimizing the internal spatial structure of square aluminum-cased batteries and improving the energy density of the cells are urgent problems that the square aluminum-cased battery industry needs to solve. Utility Model Content

[0005] One of the main objectives of this invention is to overcome at least one of the defects of the prior art and to provide a square aluminum-cased battery that can optimize the internal spatial structure of the square aluminum-cased battery and improve the energy density of the cell.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] According to one aspect of this utility model, a square aluminum-cased battery is provided, comprising a first core pack, a second core pack, an insulating connection structure, a cover plate, terminals, and an aluminum casing. Both the first and second core packs have tabs on the same side. Each tab includes a positive and a negative tab arranged side-by-side. The insulating connection structure includes a pad, a connecting piece, and a base. The pad and the base are parallel to each other and are respectively connected to the two ends of the connecting piece, extending to both sides. A conductive metal plate is disposed on the pad. The connecting piece is sandwiched between the first and second core packs. The pad is pressed between the tabs and the end faces of the core packs. The base, in conjunction with the pad, is clamped against the bottom of the first and second core packs. The terminals, tabs, and conductive metal plate are welded together. The aluminum casing houses the first and second core packs. The cover plate presses against the exposed portions of the first and second core packs and is welded to the aluminum casing around its entire circumference.

[0008] According to a specific embodiment of the present invention, the first core package and the second core package are further wrapped with a Mylar membrane.

[0009] According to a specific embodiment of the present invention, the first core package and the second core package are bonded and fixed together by insulating high-temperature adhesive.

[0010] According to a specific embodiment of this utility model, there are three or more insulating high-temperature adhesives, which are simultaneously wrapped around the first core package and the second core package from three directions: the sides and the bottom.

[0011] According to a specific embodiment of the present invention, the electrode tab has a bent structure, and the electrode tabs of the first core package and the second core package are connected to each other.

[0012] According to a specific embodiment of the present invention, the tabs of the first core package and the tabs of the second core package are symmetrical and arranged opposite to each other.

[0013] According to a specific embodiment of this utility model, in a lithium-ion battery, the positive electrode tab is an aluminum tab and the negative electrode tab is a copper tab; in a sodium-ion battery, both the positive and negative electrode tabs are aluminum tabs.

[0014] According to a specific embodiment of this utility model, in a lithium-ion battery, the conductive metal plate at the positive electrode tab is an aluminum metal plate, and the conductive metal plate at the negative electrode tab is a copper metal plate; in a sodium-ion battery, the conductive metal plates at both the positive and negative electrodes are aluminum metal plates.

[0015] According to a specific embodiment of the present invention, an insulating pad is provided between the cover plate and the pole post.

[0016] According to a specific embodiment of the present invention, the cover plate is provided with an explosion-proof valve and a liquid injection hole at the position between the two pole posts.

[0017] As can be seen from the above technical solution, the advantages and positive effects of the square aluminum-cased battery of this utility model are as follows:

[0018] This invention uses an insulated connection structure to sandwich two cores, and welds them to the tabs through a conductive metal plate, and then to the terminals. This saves internal space in the aluminum-cased square battery, allowing more space to be used for cell expansion and increasing cell energy density. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first state of the square aluminum-cased battery of this utility model.

[0020] Figure 2 This is a schematic diagram of the second state of the square aluminum-cased battery of this utility model.

[0021] Figure 3 This is a schematic diagram of the insulating connection structure in the square aluminum-cased battery of this utility model.

[0022] Figure 4 This is a schematic diagram of the third state of the square aluminum-cased battery of this utility model.

[0023] Figure 5 This is a schematic diagram of the fourth state in the square aluminum-cased battery of this utility model.

[0024] Figure 6 This is a schematic diagram of the fifth state of the square aluminum-cased battery of this utility model.

[0025] Figure 7 This is a schematic diagram of the exploded state of the cover plate assembly in the square aluminum-cased battery of this utility model.

[0026] Figure 8 This is a schematic diagram of the assembly of the cover plate in the square aluminum-cased battery of this utility model.

[0027] Figure 9 This is a schematic diagram of the sixth state in the square aluminum-cased battery of this utility model.

[0028] Figure 10This is a schematic diagram of the seventh state in the square aluminum-cased battery of this utility model.

[0029] Figure 11 This is a schematic diagram of the final state of the square aluminum-cased battery of this utility model.

[0030] Drawing number explanation:

[0031] 1. First core package; 11. Positive electrode tab of the first core package; 12. Negative electrode tab of the first core package; 2. Second core package; 21. Positive electrode tab of the second core package; 22. Negative electrode tab of the second core package; 3. Insulation connection structure; 31. Connecting piece; 32. Pad; 33. Base support; 4. Conductive metal plate; 5. Insulating high-temperature adhesive; 6. Terminal post; 7. Cover plate; 8. Insulating pad; 9. Explosion-proof valve; 10. Injection hole; 20. Mylar membrane; 30. Aluminum shell. Detailed Implementation

[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0033] In the following description of various examples of the present invention, reference is made to the accompanying drawings, which form part of the present invention, and which illustrate by way of example different exemplary structures, systems, and steps that can implement various aspects of the present invention. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of the present invention. Furthermore, although the terms “top,” “bottom,” “front,” “rear,” “side,” etc., may be used in this specification to describe various exemplary features and elements of the present invention, these terms are used herein only for convenience, such as the orientation according to the examples shown in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention.

[0034] like Figures 1 to 11As shown, according to one aspect of this utility model, a square aluminum-cased battery is provided, including a first core pack 1, a second core pack 2, an insulating connection structure 3, a cover plate 7, terminals 6, and an aluminum casing 30. The first core pack 1 and the second core pack 2 each have tabs on the same side, and each tab includes a positive electrode tab 11 / 21 and a negative electrode tab 12 / 22 arranged side-by-side. The insulating connection structure 3 includes a pad 32, a connecting piece 31, and a base 33. The pad 32 and the base 33 are parallel to each other and are respectively connected to the two ends of the connecting piece 31, extending to both sides. A conductive metal plate 4 is disposed on the pad 32. The connecting piece 31 is sandwiched between the first core pack 1 and the second core pack 2. The pad 32 is pressed between the tabs and the end faces of the core packs. The base 33 cooperates with the pad 32 to clamp the bottom of the first core pack 1 and the second core pack 2. The terminals 6 are welded to the tabs and the conductive metal plate 4. The aluminum shell 30 houses the first core package 1 and the second core package 2. The cover plate 7 presses against the exposed portions of the first core package 1 and the second core package 2 and is welded to the aluminum shell 30 around its entire circumference.

[0035] According to a specific embodiment of the present invention, the first core package 1 and the second core package 2 are further wrapped with a Mylar membrane 20.

[0036] According to a specific embodiment of the present invention, the first core package 1 and the second core package 2 are fixed together by an insulating high-temperature adhesive.

[0037] According to a specific embodiment of this utility model, there are three or more insulating high-temperature adhesives 5, which are simultaneously wrapped around the first core package 1 and the second core package 2 from three directions: the sides and the bottom.

[0038] According to a specific embodiment of the present invention, the electrode tab has a bent structure, and the electrode tabs of the first core package 1 and the second core package 2 are connected to each other.

[0039] According to a specific embodiment of the present invention, the tabs of the first core package 1 and the tabs of the second core package 2 are symmetrical and arranged opposite to each other.

[0040] According to a specific embodiment of this utility model, in a lithium-ion battery, the positive electrode tab is an aluminum tab and the negative electrode tab is a copper tab; in a sodium-ion battery, both the positive and negative electrode tabs are aluminum tabs.

[0041] According to a specific embodiment of this utility model, in a lithium-ion battery, the conductive metal plate at the positive electrode tab is an aluminum metal plate, and the conductive metal plate at the negative electrode tab is a copper metal plate; in a sodium-ion battery, the conductive metal plates at both the positive and negative electrodes are aluminum metal plates.

[0042] According to a specific embodiment of the present invention, an insulating pad 8 is provided between the cover plate 7 and the pole post 6.

[0043] According to a specific embodiment of the present invention, the cover plate 7 is provided with an explosion-proof valve 9 and an injection hole 10 between the two pole posts 6.

[0044] As can be seen from the above technical solution, the advantages and positive effects of the square aluminum-cased battery of this utility model are as follows:

[0045] This utility model uses an insulated connection structure to sandwich two cores, and welds them to the tabs through the conductive metal plate 5, and then to the pole post 6, thereby saving internal space of the aluminum-cased square battery. More space can be used for the expansion of the battery cells, thus improving the energy density of the battery cells.

[0046] The assembly process of this utility model's square aluminum-cased battery includes the following steps:

[0047] Step 1: Stack or wind the positive electrode, negative electrode and separator alternately into a core package, with the positive and negative electrode tabs extending on the same side and symmetrically positioned on the same plane.

[0048] Step 2: There are two core packages, namely the first core package 1 and the second core package 2. The positive electrode tabs 11 / 21 and the negative electrode tabs 12 / 22 in the first core package 11 and the second core package 12 are ultrasonically welded respectively.

[0049] Step 3: Set up two insulating connection structures 3. Each insulating connection structure 3 includes a pad 32, a connecting piece 31, and a base 33. The pad 32 and the base 33 are parallel to each other and are respectively connected to the two ends of the connecting piece 31 and extend to both sides. A conductive metal plate 4 is provided on the pad 32. The insulating connection structure 3 is made of an insulating material, any one of PPS, PE, or PP.

[0050] Step four: Pair the first core package 1 and the second core package 2. The connecting piece 31 is sandwiched between the first core package 1 and the second core package 2. The pad 32 and the base 33 are fitted together to clamp the first core package 1 and the second core package 2 on the left and right sides respectively. The two conductive metal plates 4 correspond to the inner sides of the positive electrode tab 11 / 21 and the negative electrode tab 12 / 22 respectively.

[0051] Step 5: The positive electrode tab 11 in the first core package 1 is connected to the positive electrode tab 21 in the second core package 2, and the negative electrode tab 12 in the first core package 2 and the negative electrode tab 22 in the second core package 2 are connected to wrap and combine the first core package 1 and the second core package 2.

[0052] Step six: Press the cover plate 7 onto the side of the first core package 1 and the second core package 2 that has the tabs. The laser penetrates and welds from the top of the pole post 6, welding the pole post 6, the tab 11, the tab 21 and the conductive metal plate 4 together, wherein the positive pole post is connected to the positive tab and the negative pole post is connected to the negative tab.

[0053] Step 7: Cover the assembled part with the outer insulating Mylar film 20 and install it into the aluminum shell 30 for fixation. Weld the cover plate 7 and the aluminum shell 30 around the perimeter.

[0054] According to a specific embodiment of the present invention, in step two, both the positive electrode tab 11 / 21 and the negative electrode tab 12 / 22 are bent, and the two pads 32 are respectively sandwiched between the two positive electrode tabs 11 / 21 and the two negative electrode tabs 12 / 22.

[0055] According to a specific embodiment of the present invention, in step five, the first core package 1 and the second core package 2 are bonded and fixed together by insulating high-temperature adhesive 5.

[0056] According to a specific embodiment of this utility model, in step five, there are three or more insulating high-temperature adhesives 5, which are simultaneously wrapped around the first core package 1 and the second core package 2 from three directions: the sides and the bottom.

[0057] According to a specific embodiment of this utility model, in a lithium-ion battery, the positive electrode tab is an aluminum tab and the negative electrode tab is a copper tab; in a sodium-ion battery, both the positive and negative electrode tabs are aluminum tabs.

[0058] According to a specific embodiment of this utility model, in a lithium-ion battery, the conductive metal plate at the positive electrode tab is an aluminum metal plate, and the conductive metal plate at the negative electrode tab is a copper metal plate; in a sodium-ion battery, the conductive metal plates at both the positive and negative electrodes are aluminum metal plates.

[0059] According to a specific embodiment of this utility model, a laser is used to weld the electrode post, electrode tab, and conductive metal plate together. The laser penetrates from above the positive electrode post 6 of the cover plate 7 and performs laser-through welding from top to bottom, welding the positive electrode post to the positive electrode tab 11 / 21 and the conductive metal plate 5 on the positive electrode pad 32 together; then, the same method is used to weld the negative electrode post 6 to the negative electrode tab 12 / 22 and the conductive metal plate 5 at the negative electrode.

[0060] According to a specific embodiment of the present invention, the cover plate 7 is provided with an explosion-proof valve 9 and a liquid injection hole 10 at the position between the positive electrode post and the negative electrode post.

[0061] According to a specific embodiment of the present invention, the insulating pad 8 is disposed between the cover plate 7 and the pole post 6.

[0062] Those skilled in the art to which this utility model pertains should understand that the specific structures and processes shown in the above detailed embodiments are merely exemplary and not restrictive. Furthermore, those skilled in the art can combine the various technical features described above in various possible ways to form new technical solutions or make other modifications, all of which fall within the scope of this utility model.

Claims

1. A square aluminum-cased battery, characterized in that, The device includes a first core package, a second core package, an insulating connection structure, a cover plate, a pole post, and an aluminum shell. Both the first and second core packages have tabs on the same side. Each tab includes a positive and a negative tab arranged side-by-side. The insulating connection structure includes a pad, a connecting piece, and a base. The pad and the base are parallel to each other and are respectively connected to the two ends of the connecting piece, extending to both sides. A conductive metal plate is disposed on the pad. The connecting piece is sandwiched between the first and second core packages. The pad is pressed between the tab and the end face of the core package. The base, in conjunction with the pad, is clamped against the bottom of the first and second core packages. The pole post, the tab, and the conductive metal plate are welded together. The aluminum shell houses the first and second core packages. The cover plate presses against the exposed portions of the first and second core packages and is welded to the aluminum shell around its entire circumference.

2. The square aluminum-cased battery according to claim 1, characterized in that: The first core package and the second core package are also wrapped with a Mylar membrane.

3. The square aluminum-cased battery according to claim 2, characterized in that: The first core package and the second core package are bonded and fixed together by insulating high-temperature adhesive.

4. The square aluminum-cased battery according to claim 3, characterized in that: The insulating high-temperature adhesive consists of three or more parts, which are simultaneously applied to the first core package and the second core package from three directions: the sides and the bottom.

5. The square aluminum-cased battery according to claim 1, characterized in that: The tabs are bent, and the tabs of the first core package and the second core package are connected to each other.

6. The square aluminum-cased battery according to claim 5, characterized in that: The tabs of the first core package and the tabs of the second core package are symmetrical and arranged opposite each other.

7. The square aluminum-cased battery according to claim 1, characterized in that: In lithium-ion batteries, the positive electrode tab is made of aluminum, and the negative electrode tab is made of copper; in sodium-ion batteries, both the positive and negative electrodes are made of aluminum.

8. The square aluminum-cased battery according to claim 7, characterized in that: In lithium-ion batteries, the conductive metal plate at the positive electrode tab is an aluminum plate, and the conductive metal plate at the negative electrode tab is a copper plate; in sodium-ion batteries, both the conductive metal plates at the positive and negative electrodes are aluminum plates.

9. The square aluminum-cased battery according to claim 1, characterized in that: An insulating pad is provided between the cover plate and the pole post.

10. The square aluminum-cased battery according to claim 9, characterized in that: The cover plate is provided with an explosion-proof valve and a liquid injection hole between the two poles.

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