A combined high-energy battery and electronic device

Abstract

The utility model discloses a combined high energy battery and electronic equipment, including shell and inside setting electrode, electrode includes the first electrode and at least one second electrode of one first electrode stacked setting, the first electrode includes the first electrode main part and the two recesses of one side setting, the recess of every department extends one pole lug outward, the outside of every pole lug is welded with an adapter lug, two pole lug polarities are opposite and are separated by diaphragm, and the diaphragm is cut after being placed in the corresponding recess after corresponding pole lug bending at the edge of every recess, and the recess is also used for storing electrolyte. The utility model can design the battery capacity to the maximization, and the head space utilization is high, and the liquid storage capacity increases, and the battery energy density and battery capacity retention rate are greatly improved. The pole lug bending and welding are hidden in the recess, and the lithium battery head space has the support of the hardness of the battery core body, the risk resistance of the pole lug is greatly improved, and the service life and safety performance of the battery are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a combined high-energy battery and electronic device. Background Technology

[0002] The components of a lithium battery include a stacked core with positive and negative electrode connections and a casing with positive and negative electrodes. The stacked core requires pre-welding of the soft tabs, then connecting and welding it to a harder tab. The bent soft and hard tabs are then placed in the head space of the lithium battery near the tabs. Finally, the hard tab is connected to the casing. When the power supply terminals of the power-consuming devices are connected to the positive and negative electrodes of the lithium battery casing, the lithium battery can provide power to the power-consuming devices. However, the battery obtained by this manufacturing method has the following shortcomings: (1) The head space utilization rate is low, resulting in a significant loss of energy density and affecting its performance. (2) In some application scenarios, the head space of the lithium battery does not have the support of the cell body's rigidity. Under unavoidable external force conditions, the vibration caused may lead to tab breakage, causing the lithium battery to fail to supply power, or even causing the risk of internal short circuit. Utility Model Content

[0003] This utility model addresses at least one of the aforementioned problems in the prior art by disclosing a combined high-energy battery and electronic device. The utility model features a groove at the electrode edge, concealing the tab bending and welding within the groove. This results in high head space utilization, increased liquid storage capacity, and significantly improved battery energy density and capacity retention. Furthermore, the lithium battery head space is supported by the rigidity of the cell body, greatly enhancing the tab's resilience and improving battery lifespan and safety performance.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model first provides a combined high-energy battery, including a casing and electrodes disposed inside it. The electrodes include a first electrode and at least one second electrode stacked together. The first electrode includes a first electrode body and two grooves disposed on one side thereon. A tab extends outward from each groove. The outside of each tab is welded to an adapter tab. The two tabs have opposite polarities and are separated by a separator. The separator is cut at the edge of each groove and is used to be bent along with the corresponding tab and placed in the corresponding groove. The groove is also used to store electrolyte.

[0006] As a further improvement, the bending angle is 180°.

[0007] As a further improvement, the bending structure is as follows: after bending the positive electrode tab and the cut diaphragm together to one side, the positive electrode tab and the adapter tab are bent together in the opposite direction.

[0008] As a further improvement, the diaphragm is cut close to the tab, and the maximum cutting height of the diaphragm is cut to the root of the groove.

[0009] As a further improvement, the first and second electrodes have the same overall height and width.

[0010] As a further improvement, the first electrode and the second electrode are arranged side by side along the thickness direction and connected by a bonding adhesive, the length of which does not exceed the shortest layer at the connection between the first electrode and the second electrode.

[0011] As a further improvement, the grooves are a first groove and a second groove, with the first groove extending outward to form a first electrode tab and the second groove extending outward to form a second electrode tab.

[0012] As a further improvement, the housing is an aluminum-plastic film housing. In this case, the area where part of the tab adhesive is heat-fused to the aluminum-plastic film housing is the top sealing area, and the top sealing area accommodates part of the tab adhesive in the groove.

[0013] As a further improvement, the housing is a metal shell, with one tab welded to the pole assembly and the other tab directly welded to the metal shell.

[0014] This invention also provides an electronic device, including the aforementioned battery.

[0015] The features and beneficial effects of this utility model are as follows:

[0016] (1) The present invention provides a groove structure at the edge of the electrode, which hides the bending and welding of the electrode tab in the groove. The head space of the lithium battery is supported by the hardness of the cell body, which greatly improves the resistance of the electrode tab to risks, and improves the service life and safety performance of the battery.

[0017] (2) This utility model can maximize the battery capacity, make high utilization of head space, increase liquid storage, and greatly improve battery energy density and battery capacity retention.

[0018] (3) The battery of this utility model can be a two-electrode structure or a three-electrode structure, and has strong versatility. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is a schematic diagram of the first electrode before the tab is bent, as described in this embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the first electrode after the tab has been bent according to an embodiment of the present invention;

[0022] Figure 3 for Figure 2 Sectional view along axis AA;

[0023] Figure 4 for Figure 3 Enlarged view of section A;

[0024] Figure 5 This is a schematic diagram of the second electrode tab according to an embodiment of the present utility model;

[0025] Figure 6 for Figure 5 Sectional view along the BB direction;

[0026] Figure 7 for Figure 6 Enlarged view of section B;

[0027] Figure 8 This is a schematic diagram showing the connection between the first electrode and the second electrode according to an embodiment of the present invention;

[0028] Figure 9 for Figure 8 Enlarged view of section C;

[0029] Figure 10 for Figure 8 Enlarged view of section D in the middle;

[0030] Figure 11 This is a schematic diagram of Embodiment 2 of the present utility model;

[0031] Figure 12 This is a schematic diagram of Embodiment 3 of the present utility model;

[0032] Figure 13 This is a schematic diagram of Embodiment 4 of the present utility model;

[0033] Figure 14 Figure 13 Enlarged view of section F in the middle;

[0034] Figure 15 This is a schematic diagram of Embodiment 5 of the present utility model;

[0035] Figure 16 This is a schematic diagram of Embodiment 6 of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-First electrode; 11-First electrode body; 12-First electrode tab; 13-Second electrode tab; 14-First groove; 15-Second groove; 16-Diaphragm; 2-Second electrode; 21-Second electrode body; 22-Third electrode tab; 23-Fourth electrode tab; 3-Adapter electrode tab; 4-Connecting adhesive; 5-Electrode tab adhesive; 6-Aluminum-plastic film shell; 7-Metal shell; 8-Electrode post assembly; 9-Capping area. Detailed Implementation

[0038] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below, along with embodiments of this utility model, but this does not limit the scope of this utility model.

[0039] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] A type of combined high-energy battery, such as Figures 1 to 16As shown, the device includes a housing and electrodes disposed inside it. The electrodes include a first electrode 1 and at least one second electrode 2 stacked together. The first electrode 1 includes a first electrode body 11 and two grooves disposed on one side thereon. A tab extends outward from each groove. The outside of each tab is welded to an adapter tab 3. The two tabs have opposite polarities and are separated by a diaphragm 16. The diaphragm 16 is cut at the edge of each groove and is used to be placed in the corresponding groove after being bent along with the corresponding tab. The groove is also used to store electrolyte.

[0042] The bending angle is 180°, and the specific bending structure is as follows: First bend: first, the positive electrode tab and the cut diaphragm 6 are gathered to one side and then bent together to the other side; Second bend: then the positive electrode tab and the adapter tab are bent together in the opposite direction, and then the adapter tab is led out.

[0043] When cutting the diaphragm 16, pay attention to the coverage size between the diaphragm and the tab. A certain gap should be left between the cut and the negative electrode. The diaphragm should cover the tab by ≥0.1mm. This satisfies processing accuracy and prevents short circuits and fires caused by thermal shrinkage of the diaphragm. The diaphragm cut should be close to the tab; this is the limit. Any larger cut will cut into the tab. The maximum cutting height of the diaphragm 16 is the root of the groove. Cutting beyond this will cut into the first electrode body 11.

[0044] The first electrode 1 and the second electrode 2 have the same overall height and width, but their thicknesses can be the same or different. The thickness of the first electrode 1 is greater than or equal to the welding height of the tab, so that the height of the pre-welding of the tab and the bending after welding with the adapter tab in the thickness direction of the first electrode 1 does not exceed the thickness of the first electrode body 11. Otherwise, it will affect the overall assembly and overall thickness of the combined high-energy battery. In the projection of the electrode thickness direction, the center position of the tab of each electrode is the same, and the width of the tab of the second electrode 2 does not exceed the width of the separator 16 cut in each groove. Otherwise, it will scratch the electrode sheet around the groove during bending, affecting the bending effect. The first electrode and the second electrode are arranged side by side along the thickness direction and connected by the connecting adhesive 4. The connecting adhesive includes, but is not limited to, hot pressing or hot melt adhesive bonding.

[0045] The length of the adhesive 4 shall not exceed the shortest layer at the junction of the first electrode 1 and the second electrode 2. Its length can be flexibly set according to the actual situation, with the principle of ensuring that the first electrode and the second electrode are firmly bonded.

[0046] In some embodiments, if the outermost part of the first electrode 1 in contact with the second electrode 2 is the positive electrode, then the outermost part of the second electrode in contact with the first electrode is the diaphragm, and the part adjacent to the outermost part is the negative electrode. This arrangement ensures that the electrode capacity at the connection between the first electrode 1 and the second electrode 2 can also be utilized.

[0047] In other embodiments, if the outermost part of the first electrode in contact with the second electrode 2 is the negative electrode, then the outermost part of the second electrode in contact with the first electrode is the diaphragm, and the part adjacent to the outermost part is the positive electrode.

[0048] In some other embodiments, if the outermost part of the first electrode 1 that is in contact with the second electrode 2 is a diaphragm and the part adjacent to the outermost part is a positive electrode, then the outermost part of the second electrode that is in contact with the first electrode is a negative electrode.

[0049] In other embodiments, if the outermost part of the first electrode in contact with the second electrode is a diaphragm and the part adjacent to the outermost part is a negative electrode, then the outermost part of the second electrode in contact with the first electrode is a positive electrode.

[0050] The combined high-energy battery also includes a tab connection end and a housing connection end. The tab connection end is used to connect the tabs, and the housing connection end is used to connect the housing, thereby realizing the electrical connection between the electrode body and the external device.

[0051] In one or more embodiments, the grooves are a first groove 14 and a second groove 15, the first groove 14 extends outward to form a first electrode tab 12, the second groove 15 extends outward to form a second electrode tab 13, and the second electrode tab 13 has the opposite polarity to the first electrode tab 12 and is separated by a diaphragm 16.

[0052] The groove design not only accommodates electrode tab bonding and bending but also stores more electrolyte, improving electrolyte wetting and ensuring good electrochemical performance throughout the battery's lifespan. Furthermore, compared to other areas, lithium plating is more likely to occur near the electrodes. This design allows for the storage of more electrolyte in the vicinity of the electrodes, enabling freer flow and distribution of the electrolyte within the electrode, especially near the electrodes. This improves electrolyte wetting, mitigates the risk of lithium plating near the electrodes, enhances cycle performance, and ensures good electrochemical performance throughout the battery's lifespan.

[0053] The specific method is as follows: First, the electrode sheet is processed into a shape with a first groove and a second groove, and then spaced apart from the diaphragm 16 to form an electrode. The first electrode tab 12 and the second electrode tab 13 are both extended from the first electrode body 11. Specifically, the first electrode tab 12 extends outward from the first groove, and the second electrode tab 13 extends outward from the second groove. Second, the two electrodes tabs are pre-welded along the edge of the diaphragm 16 using ultrasonic waves, and then the two electrodes tabs are welded to the adapter electrode tab 3 using ultrasonic waves. Finally, along the height direction of the first electrode body 11, the diaphragm 16 on both sides of the first groove 14 and the second groove 15 is cut open. The first electrode tab 12 and the diaphragm located in the first groove are bent together and placed in the first groove. Similarly, the second electrode tab 13 and the diaphragm located in the second groove are bent together and placed in the second groove. The first electrode is thus formed. The structure of the first electrode tab and the adapter electrode tab 3 bent and placed in the first groove is as follows. Figure 2-4 As shown.

[0054] Furthermore, the thickest part of a conventional battery is often at the tab, where the thickness is typically 2.5% to 10% greater than other areas. Therefore, if the thickness at the tab can be reduced to be the same as other areas, the overall thickness of the battery can be effectively reduced. In this invention, due to the groove, the tab can be completely accommodated within it, and during the pressurization stage of formation, space is provided to allow the thicker part at the tab to move towards the groove, thus making the overall thickness of the battery uniform.

[0055] The second electrode 2 includes a second electrode body 21 and a third tab 22 and a fourth tab 23 extending from one side. The difference between the second electrode 2 and the first electrode 1 is that the second electrode 2 does not have a groove and a connecting tab 3. The structure of the second electrode 2 is no different from that of a conventional electrode, and will not be described in detail here.

[0056] like Figure 8 As shown, taking the first electrode tab as an example, the connection method for the second electrode tab is the same; the connection method for the first electrode and the second electrode is as follows:

[0057] S1: The first electrode tab 12 of the first electrode 1 is pre-welded against the edge of the diaphragm by ultrasonic waves;

[0058] S2: The third tab 22 of the second electrode 2 is brought together to one side for pre-welding, and the pre-welding height is less than or equal to the thickness of the first electrode 1;

[0059] S3: Fix the first electrode 12 obtained in step S1 and the third electrode 22 obtained in step S2 on both sides of the adapter electrode 3, and then weld them together.

[0060] S4: The first tab 12 of the combined electrode obtained in step S3 is bent, and the bent first tab 11 is placed in the first groove 14 of the first electrode 1.

[0061] S5: Tightly bond the combined electrodes obtained in step S4 together using adhesive.

[0062] Among them, the bonding adhesive is preferably produced by hot pressing, which does not increase the thickness of the stacked cores and is beneficial to improving the energy density of the battery.

[0063] By encapsulating the above-mentioned combined electrodes in a housing and injecting electrolyte, a combined high-energy battery can be obtained. This method can greatly improve the energy density of the battery because the thickness of the first electrode is consistent with the welding height, and at the same time, the size of the second electrode can be maximized, making full use of the head space to improve the energy density of the battery.

[0064] The casing can be made of conductive metals such as aluminum, steel, stainless steel, nickel, copper, or magnesium alloy, or it can be made of aluminum-plastic film. In some embodiments, the casing is an aluminum-plastic film casing, such as... Figure 11 As shown, the area where part of the tab adhesive 5 is heat-fused to the aluminum-plastic film shell is the top sealing area 9. In this area, placing part of the tab adhesive 5 in the groove can further reduce the overall volume of the battery, thereby increasing the energy density. At the same time, placing part of the tab adhesive 5 inside can make the battery more regular in shape, which is beneficial for the design of the battery compartment and also for the assembly with the battery compartment.

[0065] In other embodiments, the housing is a metal shell, such as... Figure 12 As shown, a battery is obtained by welding one tab to the terminal assembly and the other tab directly to the metal casing. Because the tab adhesive 5 is omitted from the metal casing, a higher energy density can be achieved.

[0066] The following are comparative examples and embodiments of a battery with a two-electrode combination (including a first electrode and a second electrode):

[0067] Comparative Example 1

[0068] Neither the first nor the second electrode has grooves. The casing is made of aluminum alloy. The battery's external dimensions are 100mm long × 50mm wide × 5.7mm thick. The battery can store 8.13g of liquid, and its 600T cycle retention rate is 88.5%.

[0069] Example 1

[0070] The first electrode has two grooves, the second electrode has the existing structure, the shell is made of aluminum alloy, the external dimensions of the battery are 100mm long × 50mm wide × 5.7mm thick, the battery can store 8.25g of liquid, and the 600T cycle retention rate is 89.4%.

[0071] Example 2

[0072] The first electrode has two grooves, the second electrode has the existing structure, the shell is an aluminum-plastic film shell, the external dimensions of the battery are 100mm long × 50mm wide × 5.7mm thick, the liquid capacity that the battery can store is 8.67g, and the 600T cycle retention rate is 91.8%.

[0073] Example 3

[0074] The first electrode has two grooves, the second electrode has the existing structure, the casing is a stainless steel shell, the external dimensions of the battery are 100mm long × 50mm wide × 5.7mm thick, the battery can store 8.89g of liquid, and the 600T cycle retention rate is 93.1%.

[0075] The following are comparative examples and embodiments of a battery with a three-electrode assembly (including a first electrode 1 and a second electrode 2 connected to both sides by connecting adhesive 4, with the connection method being the same as that of a two-electrode assembly; under different shell materials, the adapter tabs or terminal assemblies are all led out from the first electrode):

[0076] Comparative Example 2

[0077] Neither the first nor the second electrode has grooves. The casing is made of aluminum alloy. The battery's external dimensions are 150mm long × 50mm wide × 9mm thick. The battery can store 12.23g of liquid, and its 600T cycle retention rate is 84.2%.

[0078] Example 4

[0079] The first electrode has two grooves, the second electrode has the existing structure, the shell is made of aluminum alloy, the external dimensions of the battery are 150mm long × 50mm wide × 9mm total thickness, the battery can store 12.87g of liquid, and the 600T cycle retention rate is 86.2%.

[0080] Example 5

[0081] The first electrode has two grooves, the second electrode has the existing structure, the shell is an aluminum-plastic film shell, the external dimensions of the battery are 150mm long × 50mm wide × 9mm total thickness, the liquid capacity that the battery can store is 13.66g, and the 600T cycle retention rate is 89.9%.

[0082] Example 6

[0083] The first electrode has two grooves, the second electrode has the existing structure, the casing is a stainless steel casing, the external dimensions of the battery are 150mm long × 50mm wide × 9mm total thickness, the battery can store 14.21g of liquid, and the 600T cycle retention rate is 91.7%.

[0084] As can be seen from the above-mentioned batteries with both two-electrode and three-electrode combinations, when the electrodes of this application are placed inside the casing, they can abut against the inside of the casing on all sides, maximizing the battery capacity design, maximizing the utilization of the head space, increasing the liquid storage capacity, and greatly improving the battery energy density and battery capacity retention rate. By hiding the bending and welding of the tabs within the grooves, the lithium battery head space is supported by the rigidity of the cell body, greatly improving the tabs' resistance to damage, and enhancing the battery's lifespan and safety performance.

[0085] It should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A combined high-energy battery, characterized in that: The device includes a housing and electrodes disposed inside it. The electrodes include a first electrode and at least one second electrode stacked together. The first electrode includes a first electrode body and two grooves disposed on one side thereon. A tab extends outward from each groove. The outside of each tab is welded to an adapter tab. The two tabs have opposite polarities and are separated by a diaphragm. The diaphragm is cut at the edge of each groove and is used to be placed in the corresponding groove after being bent along with the corresponding tab. The groove is also used to store electrolyte.

2. The combined high-energy battery according to claim 1, characterized in that: The bending angle is 180°.

3. A combined high-energy battery according to claim 1, characterized in that: The bending structure is as follows: after bending the positive electrode tab and the cut diaphragm together to one side, the positive electrode tab and the adapter tab are bent together in the opposite direction.

4. A combined high-energy battery according to claim 1, characterized in that: The diaphragm is cut close to the tab, and the maximum cutting height of the diaphragm is cut to the root of the groove.

5. A combined high-energy battery according to claim 1, characterized in that: The first and second electrodes have the same overall height and width.

6. A combined high-energy battery according to claim 1, characterized in that: The first electrode and the second electrode are arranged side by side along the thickness direction and connected by adhesive. The length of the adhesive does not exceed the shortest layer at the junction of the first electrode and the second electrode.

7. A combined high-energy battery according to claim 1, characterized in that: The grooves are a first groove and a second groove, with the first groove extending outward to form a first electrode tab and the second groove extending outward to form a second electrode tab.

8. A combined high-energy battery according to claim 1, characterized in that: The shell is an aluminum-plastic film shell. At this time, the area where part of the tab adhesive is heat-fused to the aluminum-plastic film shell is the top sealing area, and the top sealing area accommodates part of the tab adhesive in the groove.

9. A combined high-energy battery according to claim 1, characterized in that: The casing is a metal casing, with one electrode tab welded to the electrode post assembly and the other electrode tab directly welded to the metal casing.

10. An electronic device, characterized in that, The battery includes any one of claims 1 to 9.

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