Steel can laminated battery

Abstract

The utility model discloses a steel shell lamination battery belongs to battery technical field, including casing and the electric core in the casing in, the casing includes upper cover, lower cover and insulating frame body, and the insulating frame body sets up between the upper cover and lower cover, and the electric core includes a plurality of positive sheet and a plurality of negative sheet, and the positive sheet is with negative sheet and is stacked setting, and is provided with the ear on every positive sheet and every negative sheet, and the ear on all positive sheet forms the positive ear in common, and the ear on all negative sheet forms the negative ear in common, and the positive ear and negative ear include connecting section and transition section, and the transition section of positive ear is connected with all positive sheet, and the connecting section of positive ear is connected with the upper cover, and the transition section of negative ear is connected with all negative sheet, and the connecting section of negative ear is connected with the lower cover. Compared with prior art, the application does not need to set the pole in the inside of steel shell lamination battery, improves the space utilization of steel shell lamination battery inside, thereby improves the energy density of steel shell lamination battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a steel-cased laminated battery. Background Technology

[0002] With the continuous advancement of battery technology, the battery industry's pursuit of energy density (ED) has become increasingly extreme. The emergence of steel-cased laminated cells is a significant achievement in this pursuit. By employing a lamination process, the active materials inside the cell can be arranged more tightly and orderly, thereby significantly improving space utilization. This innovation not only optimizes the internal structure of the battery but also enables the battery to store more energy while maintaining the same volume or weight.

[0003] A common problem in existing steel-cased battery designs is that the terminals are typically located in the middle of the battery frame. This design results in a relatively large gap (PA gap) between the terminals and adjacent components along the battery's length, typically between 2.5 and 3.5 millimeters. This gap occupies internal space and limits further improvements in the battery's overall energy density (ED). Utility Model Content

[0004] The main purpose of this invention is to propose a steel-cased laminated battery, which aims to solve the problem that the large space occupied by the terminals in existing steel-cased laminated batteries affects the energy density of the battery.

[0005] To achieve the above objectives, this utility model proposes a steel-cased stacked battery, including a casing and a battery cell located within the casing. The casing includes an upper cover plate, a lower cover plate, and an insulating frame, with the insulating frame disposed between the upper and lower cover plates. The battery cell includes multiple positive electrode plates and multiple negative electrode plates, which are stacked. Each positive electrode plate and each negative electrode plate is provided with a tab. The tabs on all the positive electrode plates together form a positive tab, and the tabs on all the negative electrode plates together form a negative tab. The positive and negative tabs include a connecting section and a transition section. The transition section of the positive tab is connected to all the positive electrode plates, and the connecting section of the positive tab is connected to the upper cover plate. The transition section of the negative tab is connected to all the negative electrode plates, and the connecting section of the negative tab is connected to the lower cover plate.

[0006] In some embodiments, the upper cover plate is provided with a first aluminum busbar, the lower cover plate is provided with a second aluminum busbar, the positive electrode tab is connected to the upper cover plate through the first aluminum busbar, and the negative electrode tab is connected to the lower cover plate through the second aluminum busbar.

[0007] In some embodiments, the lengths of the first aluminum busbar and the second aluminum busbar are 1 to 3 mm along the direction of the cell toward the positive electrode tab.

[0008] In some embodiments, the first aluminum busbar is located at the top corner of the upper cover plate, and the second aluminum busbar is located at the top corner of the lower cover plate.

[0009] In some embodiments, the length of the first aluminum busbar is 2 to 3 mm greater than the width of the positive electrode tab; the length of the second aluminum busbar is 2 to 3 mm greater than the width of the negative electrode tab.

[0010] In some embodiments, the positive electrode tab is connected to the upper cover plate via conductive adhesive, and the negative electrode tab is connected to the lower cover plate via conductive adhesive.

[0011] In some embodiments, the positive electrode tab is connected to the first aluminum busbar via conductive adhesive, and the negative electrode tab is connected to the second aluminum busbar via conductive adhesive.

[0012] In some embodiments, the conductive adhesive is sintered silver paste.

[0013] In some embodiments, the positive electrode tab is connected to the upper cover plate through a PTC coating, and the negative electrode tab is connected to the lower cover plate through a PTC coating.

[0014] In some embodiments, the positive electrode tab is connected to the first aluminum busbar via a PTC coating, and the negative electrode tab is connected to the second aluminum busbar via a PTC coating.

[0015] This utility model proposes a steel-cased laminated battery. By isolating the upper and lower cover plates through an insulating frame, the positive and negative tabs of the internal cells of the steel-cased laminated battery are connected to the upper and lower cover plates respectively. The upper and lower cover plates are directly used as the positive and negative electrodes of the steel-cased laminated battery. Compared with the prior art, this application does not require the setting of terminals inside the steel-cased laminated battery, thereby improving the internal space utilization of the steel-cased laminated battery and further improving the energy density (ED) of the steel-cased laminated battery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of the steel-cased laminated battery of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of one embodiment of the steel-cased laminated battery of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of one embodiment of the steel-cased laminated battery of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of one embodiment of the steel-cased laminated battery of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of one embodiment of the steel-cased laminated battery of this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of one embodiment of the steel-cased laminated battery of this utility model;

[0022] Figure 7 This is a schematic diagram of the structure of one embodiment of the steel-cased laminated battery of this utility model;

[0023] Figure 8 This is a schematic diagram of one embodiment of the steel-cased laminated battery of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100 housing; 110 upper cover plate; 120 lower cover plate; 130 insulating frame; 140 first aluminum busbar; 150 second aluminum busbar; 160 conductive adhesive; 170 PTC coating; 200 battery cell; 210 positive electrode tab; 220 negative electrode tab; 230 positive electrode sheet; 240 negative electrode sheet; 250 aluminum foil sheet. Detailed Implementation

[0026] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0029] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0030] This utility model proposes a steel-cased laminated battery, including a casing 100 and a battery cell 200 located within the casing 100. The casing 100 includes an upper cover plate 110, a lower cover plate 120, and an insulating frame 130, with the insulating frame 130 disposed between the upper cover plate 110 and the lower cover plate 120. The battery cell 200 includes multiple positive electrode plates 230 and multiple negative electrode plates 240, and the positive electrode plates 230 and negative electrode plates 240 are stacked. Each positive electrode plate 230 and each negative electrode plate 240 has... The tabs are provided, with the tabs on all the positive electrode plates 230 forming a positive tab 210, and the tabs on all the negative electrode plates 240 forming a negative tab 220. The positive tab 210 and the negative tab 220 include a connecting section and a transition section. The transition section of the positive tab 210 is connected to all the positive electrode plates 230, the connecting section of the positive tab 210 is connected to the upper cover plate 110, the transition section of the negative tab 220 is connected to all the negative electrode plates 240, and the connecting section of the negative tab 220 is connected to the lower cover plate 120.

[0031] In some embodiments, the upper cover plate 110 is provided with a first aluminum busbar 140, the lower cover plate 120 is provided with a second aluminum busbar 150, the positive electrode tab 210 is connected to the upper cover plate 110 through the first aluminum busbar 140, and the negative electrode tab 220 is connected to the lower cover plate 120 through the second aluminum busbar 150.

[0032] Please see Figures 1 to 2 This application proposes a steel-cased laminated battery, including a casing 100 and a battery cell 200. The battery cell 200 is disposed inside the casing 100, which encapsulates the battery cell 200. The casing 100 consists of an upper cover plate 110, a lower cover plate 120, and an insulating frame 130. Specifically, the insulating frame 130 is located between the upper cover plate 110 and the lower cover plate 120 to separate them and prevent electrical conductivity between them. The battery cell 200 also includes multiple positive electrode plates 230 and multiple negative electrode plates 240, which are stacked. Each positive electrode plate 230 and each negative electrode plate 240 has an outwardly extending aluminum foil 250 at its edge, which serves as a tab for the positive electrode plate 230 and the negative electrode plate 240. All the aluminum foil sheets 250 on the positive electrode 230 are assembled together to form a positive electrode tab 210, and all the aluminum foil sheets 250 on the negative electrode 240 are assembled together to form a negative electrode tab 220. The positive electrode tab 210 and the negative electrode tab 220 include a connecting section and a transition section. The transition section of the positive electrode tab 210 is connected to all the positive electrode sheets 230, the connecting section of the positive electrode tab 210 is connected to the upper cover plate 110, the transition section of the negative electrode tab 220 is connected to all the negative electrode sheets 240, and the connecting section of the negative electrode tab 220 is connected to the lower cover plate 120.

[0033] It should be noted that a first aluminum busbar 140 is provided on the upper cover plate 110, and the connecting section of the positive electrode tab 210 of the battery cell 200 is welded to the first aluminum busbar 140. A second aluminum busbar 150 is provided on the lower cover plate 120, and the connecting section of the negative electrode tab 220 of the battery cell 200 is welded to the second aluminum busbar 150. With this arrangement, the upper cover plate 110 and the lower cover plate 120 can be used as the positive and negative electrodes of the steel-cased laminated battery proposed in this application.

[0034] In general, existing steel-cased laminated batteries typically have terminals at both ends, serving as the positive and negative electrodes. Along the length of the battery, these terminals occupy internal space, creating a gap of 2.5mm to 3.5mm. This gap reduces the internal space utilization and limits further increases in energy density. The steel-cased laminated battery proposed in this application eliminates the terminals, directly using the upper cover plate 110 and lower cover plate 120 as the positive and negative electrodes. Along the length of the battery, the gap between the upper cover plate 110 and lower cover plate 120 and adjacent components is reduced to between 0.6mm and 0.8mm, thereby improving the internal space utilization and further increasing the energy density. Furthermore, since this application eliminates the setting of the terminal post, there is no need to open a through hole for the terminal post to pass through on the casing 100 of the steel-cased laminated battery, which further improves the sealing performance of the steel-cased laminated battery.

[0035] In some embodiments, along the direction of the cell 200 toward the positive electrode tab 220, i.e. Figure 1 and Figure 2 As shown from left to right, the lengths of the first aluminum busbar 140 and the second aluminum busbar 150 are 1 to 3 mm.

[0036] In some embodiments, the first aluminum busbar 140 is located at the top corner of the upper cover plate 110, and the second aluminum busbar 150 is located at the top corner of the lower cover plate 120.

[0037] In some embodiments, the length of the first aluminum busbar 140 is 2 to 3 mm greater than the width of the positive electrode tab 210; the length of the second aluminum busbar 150 is 2 to 3 mm greater than the width of the negative electrode tab 220.

[0038] like Figure 3 and Figure 4As shown, in this embodiment, the lengths of the first aluminum busbar 140 and the second aluminum busbar 150 range from 1mm to 3mm. Specifically, the length of the first aluminum busbar 140 on the upper cover plate 110 is 2mm greater than the width of the positive electrode tab 210, and the length of the second aluminum busbar 150 on the lower cover plate 120 is 2mm greater than the width of the negative electrode tab 220. This is to ensure that the positive electrode tab 210 and the negative electrode tab 220 can be completely connected. Since both the positive electrode tab 210 and the negative electrode tab 220 are collections of multiple aluminum foil pieces 250, this design ensures that each aluminum foil piece 250 on the positive electrode tab 210 and the negative electrode tab 220 can be connected to the corresponding aluminum busbar. In addition, the first aluminum busbar 140 and the second aluminum busbar 150 also serve to position the welding points. The first aluminum busbar 140 is located at the top corner of the upper cover plate 110, and the second aluminum busbar 150 is located at the top corner of the lower cover plate 120. The arrangement of the first aluminum busbar 140 and the second aluminum busbar 150 can effectively prevent the upper cover plate 110 and the lower cover plate 120 from being welded through during the welding process when using the thinner upper cover plate 110 and the lower cover plate 120.

[0039] In some embodiments, the positive electrode tab 210 is connected to the upper cover plate 110 via conductive adhesive 160, and the negative electrode tab 220 is connected to the lower cover plate 120 via conductive adhesive 160.

[0040] In some embodiments, the positive electrode 210 is connected to the first aluminum busbar 140 via conductive adhesive 160, and the negative electrode 220 is connected to the second aluminum busbar 150 via conductive adhesive 160.

[0041] In some embodiments, the conductive adhesive 160 is sintered silver paste.

[0042] like Figure 5 and Figure 6As shown, in this embodiment, the positive electrode tab 210 is directly bonded to the first aluminum busbar 140 of the upper cover plate 110 using conductive adhesive 160, and the negative electrode tab 220 is directly bonded to the second aluminum busbar 150 of the lower cover plate 120 using conductive adhesive 160. Here, the first aluminum busbar 140 and the second aluminum busbar 150 serve to position the connection points. Furthermore, welding dust is a concern during the manufacturing process of steel-cased laminated batteries. To avoid the adverse effects of welding dust on the performance of steel-cased laminated batteries, a common practice is to add a dust vacuum adsorption process after the welding process. The dust vacuum adsorption process, using specialized vacuum adsorption equipment, can quickly and effectively remove the welding dust scattered in the working area after welding. This step not only ensures the cleanliness of the battery's internal environment but also reduces the risk of potential damage to battery performance caused by dust. Compared to welding, the positive electrode tab 210 and negative electrode tab 220 in this embodiment do not need to be welded inside the casing 100, thus avoiding welding dust remaining inside the casing 100 and reducing the impact on the performance of the steel-cased laminated battery. Furthermore, since the welding step is eliminated, the dust vacuum adsorption process is also unnecessary, further simplifying the production process.

[0043] In other embodiments, the first aluminum busbar 140 and the second aluminum busbar 150 may be omitted, and the positive electrode tab 210 may be directly bonded to the upper cover plate 110 with conductive adhesive 160, and the negative electrode tab 220 may be bonded to the lower cover plate 120 with conductive adhesive 160, thereby further improving space utilization.

[0044] Regarding the selection of conductive adhesive 160, this embodiment uses high-temperature resistant sintered silver paste. The melting temperature of sintered silver paste is between 200°C and 300°C, and its bonding tensile strength exceeds 10N, to meet the current usage requirements of steel-cased stacked batteries.

[0045] In some embodiments, the positive electrode tab 210 is connected to the upper cover plate 110 through the PTC coating 170, and the negative electrode tab 220 is connected to the lower cover plate 120 through the PTC coating 170.

[0046] In some embodiments, the positive electrode 210 is connected to the first aluminum busbar via a PTC coating 170, and the negative electrode 220 is connected to the second aluminum busbar via a PTC coating 170.

[0047] like Figure 7 and Figure 8As shown, in this embodiment, the positive electrode tab 210 is bonded to the first aluminum busbar 140 of the upper cover plate 110 by a layer of PTC coating 170, and the negative electrode tab 220 is bonded to the second aluminum busbar 150 of the lower cover plate 120 by a layer of PTC coating 170. The bonding tensile force of the PTC coating 170 exceeds 10N to ensure a stable connection. Here, the first aluminum busbar 140 and the second aluminum busbar 150 serve to position the connection points. This PTC coating 170 has an overcurrent and high-temperature blocking function, providing an effective protection mechanism for the battery. Specifically, when the local temperature of the steel-cased laminated battery rises sharply due to abnormal conditions such as short circuits, overcharging, or punctures, the resistance of the PTC coating 170 increases instantaneously, effectively blocking the current and preventing damage to the steel-cased laminated battery due to overcurrent or high temperature, thus avoiding thermal runaway leading to fire or explosion. When the temperature drops to a safe range, the resistance of the PTC coating 170 returns to normal, allowing the steel-cased laminated battery to continue to conduct electricity and operate normally. Compared to welding, the tabs in this embodiment do not need to be welded inside the housing 100, which avoids welding dust remaining inside the housing 100 and thus reduces the impact on the performance of the steel-cased laminated battery. Furthermore, since the welding step is eliminated, the dust vacuum adsorption process is also unnecessary, further simplifying the production process.

[0048] In other embodiments, the first aluminum busbar 140 and the second aluminum busbar 150 may be omitted, and the positive electrode tab 210 may be directly bonded to the upper cover plate 110 through the PTC coating 170, and the negative electrode tab 220 may be bonded to the lower cover plate 120 through the PTC coating 170, thereby further improving space utilization.

[0049] The PTC coating 170 in this embodiment is mainly composed of barium titanate (BaTiO3)-based semiconductor ceramic, doped with rare earth elements (such as Y, Nb, Bi, Sb) and acceptor elements (such as Mn, Fe), and sintered with glass additives (silicon oxide, alumina). This material exhibits low resistivity below the Curie temperature (Tc), with smooth internal carrier migration and stable resistivity. However, when the temperature exceeds Tc, its crystal structure undergoes a phase transition, hindering carrier migration and causing a sharp increase in resistance, thus achieving the function of blocking current.

[0050] In summary, this utility model proposes a steel-cased laminated battery. By isolating the upper cover plate 110 and the lower cover plate 120 through the insulating frame 130, the positive electrode tab 210 and the negative electrode tab 220 of the internal cell 200 of the steel-cased laminated battery are respectively connected to the upper cover plate 110 and the lower cover plate 120. The upper cover plate 110 and the lower cover plate 120 are directly used as the positive and negative electrodes of the steel-cased laminated battery. Compared with the prior art, this application no longer needs to set the electrode post inside the steel-cased laminated battery, thereby improving the internal space utilization of the steel-cased laminated battery and further improving the energy density (ED) of the steel-cased laminated battery.

[0051] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A steel-cased laminated battery, comprising a casing and battery cells located within the casing, characterized in that, The housing includes an upper cover plate, a lower cover plate, and an insulating frame. The insulating frame is disposed between the upper cover plate and the lower cover plate. The battery cell includes multiple positive electrode plates and multiple negative electrode plates, which are stacked. Each positive electrode plate and each negative electrode plate is provided with a tab. The tabs on all the positive electrode plates together form a positive tab, and the tabs on all the negative electrode plates together form a negative tab. The positive tab and the negative tab include a connecting section and a transition section. The transition section of the positive tab is connected to all the positive electrode plates, the connecting section of the positive tab is connected to the upper cover plate, the transition section of the negative tab is connected to all the negative electrode plates, and the connecting section of the negative tab is connected to the lower cover plate.

2. The steel-cased laminated battery according to claim 1, characterized in that, The upper cover plate is provided with a first aluminum busbar, and the lower cover plate is provided with a second aluminum busbar. The positive electrode tab is connected to the upper cover plate through the first aluminum busbar, and the negative electrode tab is connected to the lower cover plate through the second aluminum busbar.

3. The steel-cased laminated battery according to claim 2, characterized in that, Along the direction of the battery cell toward the positive electrode tab, the lengths of the first aluminum busbar and the second aluminum busbar are 1 to 3 mm.

4. The steel-cased laminated battery according to claim 3, characterized in that, The first aluminum busbar is located at the top corner of the upper cover plate, and the second aluminum busbar is located at the top corner of the lower cover plate.

5. The steel-cased laminated battery according to claim 4, characterized in that, The length of the first aluminum busbar is 2 to 3 mm greater than the width of the positive electrode tab; the length of the second aluminum busbar is 2 to 3 mm greater than the width of the negative electrode tab.

6. The steel-cased laminated battery according to any one of claims 2 to 5, characterized in that, The positive electrode tab is connected to the upper cover plate via conductive adhesive, and the negative electrode tab is connected to the lower cover plate via conductive adhesive.

7. The steel-cased laminated battery according to claim 6, characterized in that, The positive electrode tab is connected to the first aluminum busbar via conductive adhesive, and the negative electrode tab is connected to the second aluminum busbar via conductive adhesive.

8. The steel-cased laminated battery according to claim 7, characterized in that, The conductive adhesive is sintered silver paste.

9. The steel-cased laminated battery according to any one of claims 2 to 5, characterized in that, The positive electrode tab is connected to the upper cover plate through a PTC coating, and the negative electrode tab is connected to the lower cover plate through a PTC coating.

10. The steel-cased laminated battery according to claim 9, characterized in that, The positive electrode tab is connected to the first aluminum busbar through a PTC coating, and the negative electrode tab is connected to the second aluminum busbar through a PTC coating.

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