Square aluminum can battery

Abstract

The utility model provides square aluminium shell battery, including first core package, second core package, insulating connection structure, negative cover, negative pole and aluminium shell, first core package and second core package are all in the opposite two ends setting positive pole lug and negative pole lug, insulating connection structure includes connecting piece and two spacers, and the spacer is connected in the both ends of connecting piece respectively oppositely, and extends to both sides, and the spacer sets up the conductive metal plate, and the connecting piece is clamped between first core package and second core package, and the two spacers are clamped the two end faces of first core package and second core package, and the negative pole and negative pole lug and conductive metal plate are welded, and the aluminium shell contains first core package and second core package, and the negative cover is pressed against the exposed part of first core package and second core package, and is welded with aluminium shell all round, and the positive pole lug and conductive metal plate are welded with aluminium shell. The utility model can optimize square aluminium shell battery internal space structure, improve the energy density of electric core and the overcurrent capacity of pole lug.

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, improve the cell energy density and the overcurrent capacity of the tabs. 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 negative electrode cover and negative electrode post. This design has several drawbacks: 1) the connecting piece bends and occupies some internal space, resulting in low space utilization; 2) the battery has low energy density; 3) the tab size is limited, affecting the current-carrying capacity of the cell tabs and leading to a large temperature rise in the cell.

[0004] Therefore, optimizing the internal spatial structure of square aluminum-cased batteries, improving cell energy density and tab overcurrent capability 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 provide a square aluminum-cased battery that can optimize the internal spatial structure of the square aluminum-cased battery, improve the energy density of the cell and the overcurrent capacity of the tabs.

[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 negative electrode cover plate, a negative electrode post, and an aluminum casing. Both the first and second core packs have positive and negative electrode tabs at opposite ends. The insulating connection structure includes a connecting piece and two pads. The pads are respectively connected to the two ends of the connecting piece and extend 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 two pads sandwich the two end faces of the first and second core packs. The negative electrode post and the negative electrode tab are welded to the conductive metal plate. The aluminum casing accommodates the first and second core packs. The negative electrode 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. The positive electrode tab and the conductive metal plate are welded to the aluminum casing.

[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 four directions: both sides and both ends.

[0011] According to a specific embodiment of the present invention, the positive electrode tabs and the negative electrode tabs on the first core package and the second core package are both bent structures and connected in pairs.

[0012] According to a specific embodiment of the present invention, the positive electrode tab of the first core package is symmetrical to the positive electrode tab of the second core package and is arranged opposite to each other; the negative electrode tab of the first core package is symmetrical to the negative electrode tab of the second core package and is 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 negative electrode cover plate and the negative electrode post.

[0016] According to a specific embodiment of the present invention, the negative electrode cover plate is provided with an explosion-proof valve and a liquid injection hole on both sides of the negative electrode post.

[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 utility model uses an insulated connection structure to sandwich two cores, and welds them to the tabs through a conductive metal plate, and then to the negative electrode post. This saves internal space in the aluminum-cased square battery, allowing more space to be used for cell expansion, thereby improving cell energy density and tab overcurrent capacity. 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 negative electrode cover plate assembly in the square aluminum-cased battery of this utility model in an explosion state.

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

[0026] Figure 8 This is a schematic diagram of the fifth state of 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 10 This 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. Insulating connection structure; 31. Connecting piece; 32 / 33. Pad; 4. Conductive metal plate; 41. Negative conductive metal plate, 42. Positive conductive metal plate; 5. Insulating high-temperature adhesive; 6. Negative electrode post; 7. Negative electrode 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, this utility model discloses a square aluminum-cased battery comprising a first core pack 1, a second core pack 2, an insulating connection structure 3, a negative electrode cover plate 7, a negative electrode post 6, and an aluminum casing 30. Both the first core pack 1 and the second core pack 2 have positive electrode tabs 11 / 21 and negative electrode tabs 12 / 22 at opposite ends. The insulating connection structure 3 includes a connecting piece 31 and two pads 32 / 33. The pads 32 / 33 are respectively connected to the two ends of the connecting piece 31 and extend to both sides. A conductive metal plate 4 is disposed on the pads 32 / 33. The connecting piece 31 is sandwiched between the first core package 1 and the second core package 2. The two pads 33 sandwich the two end faces of the first core package 1 and the second core package 2. The negative electrode post 6 and the negative electrode tab 12 / 22 are welded to the conductive metal plate 4. The aluminum shell 30 accommodates the first core package 1 and the second core package 2. The negative electrode cover plate 7 presses against the exposed parts of the first core package 1 and the second core package 2 and is welded to the aluminum shell 30 around its entire circumference. The positive electrode tab 11 / 21 and the conductive metal plate 4 are welded to the aluminum shell 30.

[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 four directions: both sides and both ends.

[0038] According to a specific embodiment of the present invention, the positive electrode tabs 11 / 21 and the negative electrode tabs 12 / 22 on the first core package 1 and the second core package 2 are all bent structures and are connected in pairs.

[0039] According to a specific embodiment of the present invention, the positive electrode tab 11 of the first core package 1 and the positive electrode tab 21 of the second core package 2 are symmetrical and arranged opposite to each other; the negative electrode tab 12 of the first core package 1 and the negative electrode tab 22 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 negative electrode cover plate 7 and the negative electrode post 6.

[0043] According to a specific embodiment of the present invention, the negative electrode cover plate 7 is provided with an explosion-proof valve 9 and a liquid injection hole 10 on both sides of the negative electrode post 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 adopts an insulating connection structure 3 to sandwich two core packages, and welds them to the tabs through a conductive metal plate 4, and then welds them to the negative electrode post 12 / 22. This saves internal space of the aluminum-cased square battery, allowing more space to be used for cell expansion, thereby improving the cell energy density and tab overcurrent capacity.

[0046] The battery assembly process in this utility model 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 electrode tab and negative electrode tab extending out at opposite ends.

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

[0049] Step 3: Set up an insulating connection structure 3, which includes a connecting piece 31 and two pads 32 / 33. The pads 32 / 33 are respectively connected to the two ends of the connecting piece 31 and extend to both sides. A conductive metal plate 4 is set on the pad 32, where 41 is the negative electrode conductive metal plate and 42 is the positive electrode conductive metal plate. 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 two pads 32 / 33 are fitted together and clamped against the side where the first core package 1 and the second core package 2 are connected. The conductive metal plates 41 and 42 correspond to the inner sides of the negative electrode tab and the positive electrode tab at both ends, respectively.

[0051] Step 5: Connect the positive electrode tab in the first core package 1 to the positive electrode tab in the second core package 2, and connect the negative electrode tab 12 in the first core package 1 to the negative electrode tab 22 in the second core package 2, thus wrapping and combining the first core package 1 and the second core package 2.

[0052] Step six: Press the negative electrode cover plate 7 onto the side of the first core package 1 and the second core package 2 that has the negative electrode tabs. The laser penetrates and welds from the upper end of the negative electrode post 6 on the negative electrode cover plate 7, welding the negative electrode post 6, the negative electrode tabs 12 / 22 and the negative electrode conductive metal plate 41 together. The negative electrode tabs 12 / 22 are welded to the negative electrode post 6 and are welded through to the corresponding conductive metal plate 41.

[0053] Step 7: Cover the assembled part with the outer insulating Mylar film 20 and fix it in the aluminum shell 30. Weld the negative electrode cover plate 7 and the aluminum shell 30 around the perimeter. Weld the positive electrode tab to the bottom of the aluminum shell 30 and weld it through to the corresponding conductive metal plate 42.

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

[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 the present invention, laser is used for penetration welding, and the welding shape is a rectangle adapted to the electrode tab.

[0060] According to a specific embodiment of the present invention, the negative electrode cover plate 7 is provided with an explosion-proof valve 9 and a liquid injection hole 10 on both sides of the negative electrode post 6.

[0061] According to a specific embodiment of the present invention, the explosion-proof valve 9 is provided with a protective plate, and the injection hole 10 is covered with a sealing aluminum plate.

[0062] The square aluminum-cased battery of this invention optimizes the connection method between the cell pack tabs and the negative electrode cover plate inside the cell, saving internal space of the aluminum casing and improving the energy density of the cell and the overcurrent capacity of the tabs.

[0063]

[0064] Table 1: Performance Comparison Table of the Three Embodiments and Comparative Examples Selected in this Utility Model

[0065] 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 negative electrode cover plate, a negative electrode post, and an aluminum shell. Both the first and second core packages have positive and negative electrode tabs at opposite ends. The insulating connection structure includes a connecting piece and two pads. The pads are respectively connected to the two ends of the connecting piece and extend to both sides. A conductive metal plate is disposed on each pad. The connecting piece is sandwiched between the first and second core packages, and the two pads sandwich the two end faces of the first and second core packages. The negative electrode post and the negative electrode tab are welded to the conductive metal plate. The aluminum shell houses the first and second core packages. The negative electrode 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. The positive electrode tab and the conductive metal plate are welded to the aluminum shell.

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 four directions: both sides and both ends.

5. The square aluminum-cased battery according to claim 1, characterized in that: The positive and negative electrode tabs on the first and second core packages are both bent and connected in pairs.

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

10. The square aluminum-cased battery according to claim 9, characterized in that: The negative electrode cover plate is provided with an explosion-proof valve and a liquid injection hole on both sides of the negative electrode post.

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