Adapter piece, battery, energy storage device and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a switching piece, a battery, an energy storage device and electric equipment. The adapter piece comprises a first connecting part and a second connecting part, the second connecting part comprises a first end and a second end in the first direction, the first end is connected to the first connecting part at an angle, the second end is provided with a groove extending in the first direction, and the groove is constructed to be provided with two opposite side walls in the second direction. And in the thickness direction of the second connecting part, the groove is provided with a bottom wall surface, so that a thickness difference is formed between the part, at the groove, of the second connecting part and the parts, located on the two sides of the groove in the second direction, of the groove. Through the arrangement of the groove, stress generated by thermal deformation of the switching piece can be effectively released, and the situation that the switching piece is subjected to thermal deformation and pulls the tab to break the tab is avoided, so that the situation of failure of a current path is avoided, and the yield and the safety performance of the battery are further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an adapter, a battery, an energy storage device, and an electrical device. Background Art

[0002] Prismatic battery cells typically consist of a top cover assembly, a shell, and a battery cell housed within the shell. The shell and top cover assembly are welded together to form a sealed enclosure. The top cover assembly primarily includes the positive and negative electrode posts, an explosion-proof valve, a liquid injection port, an adapter, and an insulation layer. During normal battery charging and discharging, the cell repeatedly heats and cools. The cell is connected to the adapter, and the temperature of the cell is transferred to the adapter, causing repeated heating and cooling. This can cause the adapter to deform due to heat, pulling on the tabs, potentially damaging the cell. Utility Model Content

[0003] The present application discloses an adapter, a battery, an energy storage device and an electrical device, which can effectively relieve the stress generated by the thermal deformation of the adapter and avoid pulling the tabs.

[0004] To achieve the above objectives, in a first aspect, the present application discloses an adapter for a battery, comprising:

[0005] a first connecting portion configured to be connected to a terminal of the battery;

[0006] a second connecting portion, the second connecting portion being configured to be connected to a tab of the battery, the second connecting portion comprising a first end and a second end opposite to each other, the first end being connected to the first connecting portion at an angle, the second end being provided with a groove, the groove penetrating an edge of the second end of the second connecting portion along a first direction, the groove being configured to have two opposing side walls in a second direction, and having a bottom wall surface along a thickness direction of the second connecting portion, so that a portion of the second connecting portion at the groove and portions located on both sides of the groove in the second direction form a thickness difference;

[0007] The second direction intersects with the first direction.

[0008] During normal battery charging and discharging, the interior of the battery cell repeatedly heats and cools, causing the adapter to repeatedly heat and cool, subjecting it to a certain degree of thermal stress. Therefore, because the portions of the second connecting portion located on either side of the groove along the second direction are thicker than the portion of the second connecting portion located at the groove, and the groove of the second connecting portion is an open groove extending through the edge, the stress generated by thermal deformation of the adapter can be effectively relieved, preventing the adapter from pulling on the tab and causing it to break, thereby avoiding current path failure and improving the battery's safety and yield rate. At the same time, the thinner thickness of the groove of the second connecting portion causes thermal stress to deform first, achieving stress relief, thereby reducing the risk of warping of the corners of the adapter located at the second end and damaging the battery cell. Furthermore, the provision of the groove allows for more accurate positioning of the assembly tool and the adapter, effectively improving battery assembly efficiency and precision. The groove design does not increase the overall volume of the adapter, which helps improve internal battery space utilization and battery cell energy density.

[0009] In addition, since the groove of the second connecting part is an open groove that runs through the edge, the assembly tool can insert the adapter plate along the second end toward the first end, so that the assembly tool can clamp the adapter plate, which is conducive to the assembly tool better inserting the groove to clamp the adapter plate, thereby helping to improve the assembly efficiency and assembly accuracy of the battery.

[0010] In some possible implementations, an angled space is formed between the first end and the first connecting portion, and the groove is provided on a side surface of the second connecting portion located in the angled space.

[0011] Because the tab is connected to the side surface of the second connecting portion facing away from the angled space, and the groove is provided on the side surface of the second connecting portion located in the angled space, that is, the groove is provided on the first surface, while the tab is connected to the second surface opposite the first surface, this avoids the connection area between the tab and the second connecting portion, allowing the assembly tool to align with the position of the groove on the first surface, providing precise positioning for the adapter. At the same time, since the groove is provided on the first surface, the assembly tool can better utilize the position of the groove to provide support force for the adapter from the first surface to the second surface, avoiding deformation of the adapter during the tab welding process, which could damage the battery cell body located in the angled space, thereby improving the battery's yield rate and safety performance.

[0012] In some possible embodiments, the first end and the second end are the two ends of the second connecting part along the first direction, and the groove has a first side wall and a second side wall along the second direction, and the first side wall and / or the second side wall are inclined so that the groove is formed as a flared groove that gradually flares from the first end to the second end in the second direction.

[0013] Therefore, the design of the expanded groove makes the opening size of the groove at the second end larger than the opening size of the groove at the first end, so that when the assembly tool is inserted from the second end to the first end, the assembly tool can enter the groove more easily, which is beneficial to improving the positioning efficiency and positioning accuracy of the assembly tool.

[0014] In some possible implementations, the groove has a first side and a second side opposite to each other along the first direction, and in the second direction, a length ratio of the first side to the second side is 1 / 2-7 / 8.

[0015] When the length ratio of the first side to the second side is too low, the length of the first side is shorter than that of the second side, making it difficult for the assembly tool to provide good support for the adapter after insertion; when the length ratio of the first side to the second side is too high, the expansion of the groove will be smaller, making it difficult to provide good positioning efficiency and positioning accuracy when the assembly tool is inserted from the second end to the first end.

[0016] In some possible implementations, in the second direction, the length of the first side is 5 mm-7 mm, and / or the length of the second side is 8 mm-10 mm.

[0017] When the length of the first side is too short, it is difficult to provide good support for the adapter after the assembly tool is inserted; when the length of the first side is too long, the mechanical strength of the adapter will be reduced, thereby increasing the possibility of deformation and warping of the adapter, and further affecting the stability and safety of the battery.

[0018] When the length of the second side is too short, that is, the edge opening of the groove at the second end of the second connecting part is smaller, it will make it difficult to accurately position the assembly tool when entering the groove, thereby reducing the battery assembly efficiency; when the length of the second side is too long, that is, the area of ​​the second connecting part located on both sides of the groove is smaller, then the edge part of the second connecting part is smaller, the mechanical strength of the adapter plate is reduced, and the problem of deformation and warping of the adapter plate increases.

[0019] In some possible implementations, a thickness ratio of a portion of the second connecting portion of the adapter plate at the groove to portions located on both sides of the groove along the second direction is 1 / 3-5 / 7.

[0020] It can be understood that the thickness ratio of the second connecting part of the adapter at the groove to the parts located on both sides of the groove along the second direction satisfies the above-mentioned value range, which can not only reduce the material used in the adapter, but also meet the mechanical strength requirements of the adapter, and improve the resistivity and conductivity of the adapter, thereby helping to improve the conversion efficiency and service life of the battery.

[0021] In some possible implementations, the groove is located in a middle portion of the second connecting portion along the second direction.

[0022] It is understood that the groove being located in the middle of the second connecting portion along the second direction can facilitate improved guidance and positioning of the assembly tooling, thereby improving assembly precision and efficiency. Furthermore, since the groove is located in the middle of the second connecting portion along the second direction, the areas of the second connecting portion on either side of the groove along the second direction are the same. This allows the ungrooved portion of the second connecting portion to evenly distribute deformation stress, preventing stress concentration in a specific area of ​​the adapter, thereby improving the stability and safety of the adapter.

[0023] In the second aspect, the present application also discloses a battery, comprising a top cover assembly, a battery cell and the adapter plate as described in the first aspect above, wherein the top cover assembly includes a pole, the battery cell includes a battery cell body and a pole ear arranged on the battery cell body, the pole is connected to the first connecting part of the adapter plate, and the pole ear is connected to the second connecting part of the adapter plate.

[0024] The battery with the adapter described in the first aspect above can also effectively release the stress generated by the thermal deformation of the adapter, avoid the effect of pulling the tabs, and thus avoid the failure of the current path, thereby improving the safety performance and yield rate of the battery. At the same time, the design of the adapter can make the positioning of the assembly tooling and the adapter more accurate, effectively improve the assembly efficiency and assembly accuracy of the battery, as well as improve the utilization rate of the internal space of the battery and the battery energy density. Of course, the adapter can also play a role in guiding and transmitting the current of the battery cell, which is conducive to the efficient transmission of electrical energy between batteries.

[0025] In some possible implementations, when an angle space is formed between the first connecting portion and the second connecting portion, the battery cell body is located in the angle space, and the tab is connected to a surface of the second connecting portion facing away from the angle space.

[0026] In this way, it is possible to avoid the situation where the raised welding points after the tabs and adapters are welded damage the diaphragm of the battery cell, reduce the occurrence of current short circuits, and thus help improve the yield and safety performance of the battery.

[0027] In some possible embodiments, the electrode column includes a positive electrode column and a negative electrode column, the electrode tab includes a positive electrode tab and a negative electrode tab, the adapter includes a positive electrode adapter and a negative electrode adapter, the positive electrode adapter is respectively connected to the positive electrode column and the positive electrode tab, the negative electrode adapter is respectively connected to the negative electrode column and the negative electrode tab, and the thickness of the second connecting portion of the positive electrode adapter is greater than or equal to the thickness of the second connecting portion of the negative electrode adapter.

[0028] Because the positive electrode adapter needs to withstand high currents, a thicker second connection portion of the positive electrode adapter effectively improves conductivity and structural stability. Additionally, a thinner second connection portion of the negative electrode adapter reduces internal resistance, thereby improving the battery's current handling capacity, which in turn helps increase the battery's conversion efficiency and service life.

[0029] In some possible implementations, the thickness ratio of the second connecting portion of the positive electrode adapter at the groove to the portions located on both sides of the groove along the second direction is 3 / 5-5 / 7; and / or,

[0030] The thickness ratio of the second connection portion of the negative electrode adapter plate at the groove to the portions located on both sides of the groove along the second direction is 1 / 3-3 / 5.

[0031] It is understood that the adapter plates include positive and negative electrode adapter plates, and that the thickness ratio of the second connection portion of the adapter plate at the groove to the portions located on either side of the groove along the second direction falls within the aforementioned range. This reduces the material used in the adapter plate while still meeting the mechanical strength requirements. Furthermore, a suitable thickness ratio can improve the resistivity and conductivity of the adapter plate, thereby increasing the conversion efficiency and service life of the battery.

[0032] In some possible implementations, the thickness of the portion of the second connecting portion of the positive electrode adapter where the groove is not provided is 2.5 mm to 3.5 mm; and / or,

[0033] The thickness of a portion of the second connecting portion of the negative electrode adapter plate where the groove is not provided is 1.5 mm to 2.5 mm.

[0034] When the positive and negative electrode adapters meet the above-mentioned limitations, they can not only increase the capacity and energy density of the battery, but also help to increase the internal resistivity and conductivity of the battery, improve the battery's charge and discharge performance, thereby extending the battery's service life and improving the battery's stability and safety. When the thickness of the positive and negative electrode adapters is too large, the internal resistance of the battery increases and the space occupied by the battery increases, thereby affecting the battery's current transmission efficiency; when the thickness of the positive and negative electrode adapters is too small, the mechanical strength of the adapters decreases, and the positive and negative electrode adapters are easily deformed by heat, resulting in poor contact between the tabs and the positive and negative electrode adapters, thereby affecting the stability and safety of the battery.

[0035] In a third aspect, the present application further discloses an energy storage device, comprising the battery as described in the second aspect above.

[0036] The energy storage device having the battery described in the second aspect above can also effectively release the stress generated by the thermal deformation of the adapter, avoid the effect of pulling the tabs, and thus avoid the failure of the current path, thereby improving the safety performance and yield rate of the battery. At the same time, the design of the adapter can make the positioning of the assembly tool and the adapter more accurate, effectively improving the assembly efficiency and assembly accuracy of the battery, as well as improving the utilization rate of the internal space of the battery and the energy density of the battery. As a result, it can be beneficial to improve the safety and energy density of the energy storage device.

[0037] In a fourth aspect, the present application further discloses an electrical device comprising the energy storage device as described in the third aspect above.

[0038] The electrical equipment with the energy storage device described in the third aspect can also effectively release the stress generated by the thermal deformation of the adapter, avoid the effect of pulling the tabs, and thus avoid the failure of the current path, thereby improving the safety performance and yield rate of the battery. At the same time, the design of the adapter can make the positioning of the assembly tool and the adapter more accurate, effectively improve the assembly efficiency and assembly accuracy of the battery, as well as improve the utilization rate of the internal space of the battery and the energy density of the battery. As a result, it can be beneficial to improve the safety and energy density of electrical equipment.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] The present application provides a transfer plate, a battery, an energy storage device and an electrical device. The transfer plate is provided with a groove on the second connecting portion for connecting the pole ear, and the thickness of the second connecting portion at the groove portion and the portion located on both sides of the groove along the second direction form a thickness difference. Therefore, since the thickness of the two sides of the groove is greater than that at the groove portion, the stress generated by the heat deformation of the transfer plate can be effectively relieved, and the heat deformation of the transfer plate can be avoided, which pulls the pole ear and causes the pole ear to break, thereby avoiding the failure of the current path, and thus improving the yield rate and safety performance of the battery. At the same time, it can also provide higher mechanical strength for the corners of the transfer plate, and reduce the warping of the corners on both sides of the transfer plate when the transfer plate is heat-deformed, thereby reducing the occurrence of damage to the battery cell due to the warping of the corners on both sides of the transfer plate. In addition, by providing the groove, the positioning of the assembly tool and the transfer plate can be made more accurate, thereby effectively improving the assembly efficiency of the battery, and the design of the groove will not increase the overall volume of the transfer plate, which is conducive to improving the utilization rate of the internal space of the battery and the energy density of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 It is a structural diagram of an adapter in the related art;

[0043] Figure 2 This is a schematic structural diagram of the first adapter disclosed in the embodiments of the present application;

[0044] Figure 3 A cross-sectional view of the first adapter disclosed in an embodiment of the present application;

[0045] Figure 4A This is a front view of the first adapter disclosed in the embodiment of the present application;

[0046] Figure 4B A front view of another arrangement of the groove disclosed in an embodiment of the present application;

[0047] Figure 4C A front view of another arrangement of the groove disclosed in an embodiment of the present application;

[0048] Figure 5 This is a front view of the second adapter disclosed in the embodiment of the present application;

[0049] Figure 6 This is a front view of the third adapter disclosed in the embodiment of the present application;

[0050] Figure 7 This is a front view of the fourth adapter disclosed in the embodiment of the present application;

[0051] Figure 8 This is a front view of the fifth adapter disclosed in the embodiment of the present application;

[0052] Figure 9 A schematic diagram of the structure of a battery disclosed in an embodiment of the present application;

[0053] Figure 10 A schematic structural diagram of the energy storage device disclosed in an embodiment of the present application;

[0054] Figure 11 This is a schematic diagram of the structure of the electrical equipment disclosed in the embodiments of this application.

[0055] Description of reference numerals:

[0056] a- adapter; b- reinforcing rib;

[0057] 100 - adapter plate; 1 - first connecting portion; 11 - through hole; 2 - second connecting portion; 2a - first end; 2b - second end; 21 - groove; 211 - first side wall; 212 - second side wall; 213 - first side edge; 214 - second side edge; 215 - bottom wall; 22 - first surface; 23 - second surface; 3 - angle space; 101 - positive electrode adapter plate; 102 - negative electrode adapter plate;

[0058] 200 - battery; 201 - top cover assembly; 201a - pole; 2011 - positive pole; 2012 - negative pole; 202 - battery cell; 202a - battery cell body; 202b - pole tab; 2021 - positive pole tab; 2022 - negative pole tab; 300 - energy storage device; 301 - protective shell;

[0059] 400-electrical equipment; 401-electric energy conversion device; 402-first user load; 403-second user load;

[0060] F1-first direction; F2-second direction. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] In this application, the terms "upper" and "upper" and other terms indicating positions or locations are based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific position, or to being constructed or operated in a specific position.

[0063] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0064] Furthermore, the terms "disposed," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0065] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0066] Batteries, as a green and clean energy source, are environmentally friendly, highly efficient, and rechargeable. They play a crucial role in the pursuit of lightweight, long-range consumer electronics and in the new energy vehicle industry. Batteries generally consist of a top cover assembly, a housing, and the battery cells contained within. The housing and top cover assembly are welded together to form a sealed enclosure. The top cover assembly primarily includes the positive and negative electrode posts, an explosion-proof valve, a liquid injection port, an adapter, and an insulating layer. The adapter connects the battery cell's tabs and the top cover assembly's posts, thereby directing and transmitting current to the battery electrodes.

[0067] During the battery manufacturing process, the tabs need to be bent so that the tabs correspond to the surface of the adapter sheet facing away from the battery cell, and the tabs and the adapter sheet are welded together to transmit current. However, during the bending and welding process, the adapter sheet is easily deformed by the bending force and the thermal stress of welding, causing the corners of the adapter sheet to warp and puncture the diaphragm of the battery cell, resulting in a short circuit inside the battery. An assembly tool is used to cooperate with the adapter sheet so that the assembly tool can provide support for the tabs and the adapter sheet during the tab bending process. However, the adapter sheet uses a protruding clamping portion to cooperate with the assembly tool, which increases the overall space occupancy rate and reduces the utilization rate of the internal space of the battery.

[0068] In addition, during the normal charging and discharging process of the battery, chemical reactions will occur inside the battery cell and generate a certain amount of heat. This heat will be conducted to the adapter connected to the battery cell. The adapter is repeatedly heated and cooled, causing metal creep inside the adapter. The adapter needs to release internal stress by deformation. If the mechanical strength of the adapter is low, it will cause a large amount of deformation of the adapter, which will cause pulling on the tabs connected to the adapter, causing the tabs to break, and then causing the battery's current path to fail.

[0069] To solve the above problem, please refer to Figure 1 In the related art, most designs employ a reinforcing rib b formed on one side of the adapter sheet a. This rib b effectively improves the mechanical strength of the adapter sheet a, thereby reducing deformation and preventing issues such as deformation and warping of the edges, thereby improving battery safety and yield. However, this design increases the overall thickness of the adapter sheet a, thereby increasing its size and reducing the internal space utilization of the battery.

[0070] In view of this, the embodiments of the present application provide a transfer plate, a battery, an energy storage device and an electrical device, which can effectively relieve the stress generated by the thermal deformation of the transfer plate, avoid the thermal deformation of the transfer plate and the pulling of the tabs, causing the tabs to break, thereby avoiding the failure of the current path, which is beneficial to improving the safety and stability of the battery. At the same time, it can also provide higher mechanical strength for the corners of the transfer plate, and reduce the warping of the corners on both sides of the transfer plate and the damage to the battery cell when the transfer plate is thermally deformed. In addition, it can also make the positioning of the assembly tool and the transfer plate more accurate, thereby effectively improving the assembly efficiency of the battery, and the design of the groove can reduce the use of materials without increasing the overall volume of the transfer plate, which is beneficial to improving the utilization rate of the internal space of the battery and the energy density of the battery cell.

[0071] The technical solution of the present application will be further described below with reference to the embodiments and drawings.

[0072] See also Figure 2-Figure 3 In a first aspect, an embodiment of the present application discloses an adapter 100 for use in a battery. The adapter 100 includes a first connecting portion 1 and a second connecting portion 2. The first connecting portion 1 is configured to connect to a terminal post 201a, and the second connecting portion 2 is configured to connect to a terminal tab 202b. The second connecting portion 2 includes a first end 2a and a second end 2b opposite to each other. The first end 2a is connected to the first connecting portion 1 at an angle, and the second end 2b is provided with a groove 21. The groove 21 extends through the edge of the second end 2b of the second connecting portion 2 along a first direction F1. The groove 21 is configured to have two opposing side walls (a first side wall 211 and a second side wall 212) in a second direction F2. The groove 21 also has a bottom wall surface 215 along the thickness direction of the second connecting portion 2, so that a thickness difference is formed between the portion of the second connecting portion 2 at the groove 21 and the portions on both sides of the groove 21 in the second direction F2. The second direction F2 intersects with the first direction F1.

[0073] As can be seen from the foregoing, during the normal charging and discharging process of the battery 200, the interior of the battery cell 202 will repeatedly heat and cool, causing the adapter 100 to repeatedly heat and cool, and the adapter 100 will be affected by a certain degree of thermal stress. Therefore, because the portions of the second connecting portion 2 located on both sides of the groove 21 along the second direction F2 are thicker than the portion of the second connecting portion 2 at the groove 21, and the groove 21 of the second connecting portion 2 is an open groove that runs through the edge, it can effectively relieve the stress generated by the thermal deformation of the adapter 100, preventing the adapter 100 from pulling on the tab 202b due to thermal deformation, causing the tab 202b to break, thereby avoiding current path failure and improving the safety performance and yield rate of the battery 200. At the same time, due to the thinner thickness of the groove 21 of the second connecting portion 2, it will deform first under the action of thermal stress, achieving stress relief, thereby reducing the possibility of warping of the corners of the adapter 100 at the second end 2b and damaging the battery cell 202. In addition, by providing the groove 21, the positioning of the assembly tooling and the adapter 100 can be made more accurate, thereby effectively improving the assembly efficiency and assembly accuracy of the battery 200. The design of the groove 21 will not increase the overall volume of the adapter, which is beneficial to improving the utilization rate of the internal space of the battery 200 and the energy density of the battery cell 202.

[0074] In addition, since the groove 21 of the second connecting part 2 is an open groove that runs through the edge, the assembly tool can be easily inserted into the adapter plate 100 from the open edge of the groove 21, so that the assembly tool can clamp the adapter plate 100, which is conducive to the assembly tool better inserting the groove 21 to clamp the adapter plate 100, thereby helping to improve the assembly efficiency and assembly accuracy of the battery 200.

[0075] Optionally, the second connecting portion 2 may be in the form of an elongated sheet. It is understood that the first direction F1 may be the length direction or the width direction of the second connecting portion 2, and the second direction F2 may be the width direction or the length direction of the second connecting portion 2. When the first direction F1 is the length direction of the second connecting portion 2, the second direction F2 is the width direction of the second connecting portion 2; or when the first direction F1 is the width direction of the second connecting portion 2, the second direction F2 is the length direction of the second connecting portion 2. This embodiment of the present application is not limited to this.

[0076] refer to Figure 4A For example, when the first direction F1 is the length direction of the second connecting part 2, the groove 21 passes through the edge of the second end 2b of the second connecting part 2 along the length direction of the second connecting part 2. At this time, the second direction F2 is the width direction of the second connecting part 2, and the groove 21 has two facing side walls along the width direction of the second connecting part 2.

[0077] refer to Figures 4B-4CFor example, when the first direction F1 is the width direction of the second connecting part 2, the groove 21 passes through the edge of the second end 2b of the second connecting part 2 along the width direction of the second connecting part 2. At this time, the second direction F2 is the length direction of the second connecting part 2, and the groove 21 has two facing side walls along the length direction of the second connecting part 2.

[0078] It can be understood that since the second end 2b is the end of the second connecting part 2 away from the first connecting part 1, the groove 21 is arranged at the second end 2b of the second connecting part 2, that is, the groove 21 can be arranged on the side of the second connecting part 2 away from the first connecting part 1, or, the groove 21 can also be arranged on the side of the second connecting part 2 away from the first connecting part 1 and opposite along the second direction F2, or, the groove 21 can also be arranged on the other side of the second connecting part 2 away from the first connecting part 1 and opposite along the second direction F2, and this application does not limit this.

[0079] Optionally, the first connecting part 1 is provided with a through hole 11, which is correspondingly connected to the pole 201a of the top cover assembly 201, so that the current generated by the battery cell body 202a can be conducted by the pole ear 202b of the battery cell 202 to the second connecting part 2 connected to the pole ear 202b, and conducted by the second connecting part 2 to the first connecting part 1 and the pole 201a, thereby realizing the transmission function of the adapter 100 on the current of the battery 200, thereby improving the conversion efficiency of the battery 200.

[0080] See also Figure 3 In some embodiments, an angled space 3 is formed between the first end 2a and the first connecting portion 1, and a groove 21 is provided on a side surface of the second connecting portion 2 located in the angled space 3. Since the tab 202b is connected to a side surface of the second connecting portion 2 facing away from the angled space 3, the groove 21 is provided on a side surface of the second connecting portion 2 located in the angled space 3. That is, the groove 21 is provided on the first surface 22, while the tab 202b is connected to the second surface 23 opposite to the first surface 22. This avoids the connection area between the tab 202b and the second connecting portion 2, allowing the assembly tool to align with the groove 21 on the first surface 22, thereby providing precise positioning for the adapter 100. At the same time, the groove 21 is provided on the first surface 22, and the assembly tooling can better utilize the position of the groove 21 to provide support force for the adapter 100 from the first surface 22 to the second surface 23, thereby avoiding the adapter 100 from deforming during the welding process of the tab 202b, thereby causing damage to the battery cell body 202a located in the angle space 3, thereby improving the yield and safety performance of the battery 200.

[0081] Please refer again Figure 2Optionally, the first end 2a and the second end 2b are the two ends of the second connecting portion 2 along the first direction F1, and the groove 21 has a first side wall 211 and a second side wall 212 along the second direction F2. The first side wall 211 and the second side wall 212 are both inclined, so that the groove 21 forms an expanding groove that gradually expands from the first end 2a to the second end 2b in the second direction F2. Thus, the design of the expanding groove makes the opening size of the groove 21 at the second end 2b larger than the opening size of the groove 21 at the first end 2a. This makes it easier for the assembly tool to enter the groove 21 when it is inserted from the second end 2b to the first end 2a, thereby improving the positioning efficiency and positioning accuracy of the assembly tool.

[0082] Please also refer to Figure 4A 、 Figure 5 It is understood that, in addition to the aforementioned configurations of both the first side wall 211 and the second side wall 212 being inclined, other examples are possible, such as only the first side wall 211 being inclined, or only the second side wall 212 being inclined. The above examples all enable the groove 21 to be formed as an expanding groove that gradually expands from the first end 2a to the second end 2b in the second direction F2, i.e., the opening size of the groove 21 at the second end 2b is larger than the opening size of the groove 21 at the first end 2a. In other words, the shape of the projection of the groove 21 onto the surface along the thickness direction of the second connecting portion 2 can be an isosceles trapezoid, a normal trapezoid, a right-angled trapezoid, etc., all of which can meet the purpose to be achieved by the embodiments of the present application.

[0083] Of course, as other embodiments, the shape of the projection of the groove 21 of the present application onto the surface along the thickness direction of the second connecting portion 2 can also be a square, a rectangle (refer to FIG. Figure 6 This application does not make any specific limitation on this.

[0084] Optionally, the groove 21 has a first side 213 and a second side 214 that are opposite to each other along the first direction F1, that is, the projection of the groove 21 onto the first surface 22 has a first side 213 and a second side 214 that are opposite to each other along the first direction F1. Furthermore, in the second direction F2, the length ratio of the first side 213 to the second side 214 is 1 / 2-7 / 8, which may include, but is not limited to, 1 / 2, 5 / 8, 3 / 4, 7 / 8, etc., and is not specifically limited in this embodiment of the present application.

[0085] When the length ratio of the first side 213 to the second side 214 is too low, the length of the first side 213 is shorter than the length of the second side 214, making it difficult for the assembly tool to provide better support for the adapter 100 after insertion; when the length ratio of the first side 213 to the second side 214 is too high, the expansion of the groove 21 will be smaller, making it difficult to provide better positioning efficiency and positioning accuracy when the assembly tool is inserted from the second end 2b to the first end 2a.

[0086] Optionally, in the second direction F2, the length W1 of the first side 213 is 5 mm to 7 mm, and may include, but is not limited to, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, etc. If the length W1 of the first side 213 is too short, the assembly tool may not provide adequate support for the adapter 100 after insertion. If the length W1 of the first side 213 is too long, the mechanical strength of the adapter 100 may be reduced, thereby increasing the possibility of deformation and warping of the adapter 100, and further affecting the stability and safety of the battery 200.

[0087] Optionally, the length W2 of the second side 214 is 8mm-10mm, and illustratively, may include but is not limited to 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc. When the length W2 of the second side 214 is too low, that is, the edge opening of the groove 21 at the second end 2b of the second connecting portion 2 is small, it will be difficult to accurately position the assembly tool when entering the groove 21, thereby reducing the assembly efficiency of the battery 200; when the length W2 of the second side 214 is too high, that is, the area of ​​the second connecting portion 2 located on both sides of the groove 21 is small, the edge portion of the second connecting portion 2 is small, the mechanical strength of the adapter 100 is reduced, and the problem of deformation and warping of the adapter 100 is increased.

[0088] It should be noted that the value ranges of the first side 213 and the second side 214 in the embodiment of the present application are only examples and can be adjusted according to actual needs, and are not particularly limited here.

[0089] In some embodiments, the thickness ratio between the thickness X0 of the second connection portion 2 of the adapter sheet 100 at the groove 21 and the thickness X1 of the portions located on both sides of the groove along the second direction F2 is 1 / 3-5 / 7. For example, it may include but is not limited to 1 / 3, 3 / 7, 11 / 21, 13 / 21, 5 / 7, etc., which is not specifically limited in the embodiments of the present application. That is to say, the thickness ratio between the thickness X0 of the second connection portion 2 of the adapter sheet 100 at the groove 21 and the thickness X1 of the portions located on both sides of the groove 21 along the second direction F2 satisfies the above-mentioned value range, which can not only reduce the material used in the adapter sheet 100, but also meet the mechanical strength requirements of the adapter sheet 100, thereby improving the resistivity and conductivity of the adapter sheet 100, and further facilitating the improvement of the conversion efficiency and service life of the battery 200.

[0090] In some embodiments, the groove 21 is located in the middle of the second connecting portion 2 along the second direction F2. Positioning the groove 21 in the middle of the adapter plate 100 facilitates guiding and positioning the assembly tooling, thereby improving assembly precision and efficiency. Furthermore, since the groove 21 is located in the middle of the second connecting portion 2 along the second direction F2, the areas of the second connecting portion 2 on either side of the groove 21 along the second direction F2 are the same. This allows the portion of the second connecting portion 2 not provided with the groove 21 to evenly distribute deformation stress, preventing stress concentration in a specific area of ​​the adapter plate 100, thereby improving the stability and safety of the adapter plate 100.

[0091] Please also refer to Figure 7-Figure 8 For example, in addition to the above, the groove 21 can also be located on one side of the second connecting part 2 along the second direction F2, or the groove 21 can also be located on the other side of the second connecting part 2 along the second direction F2. This embodiment of the present application is not limited to this.

[0092] It is understandable that the groove 21 in the embodiment of the present application can be formed by one-step pressing or by milling, and the present application does not limit this.

[0093] See also Figure 9In a second aspect, the present application also discloses a battery 200, comprising a top cover assembly 201, a battery cell 202, and an adapter 100. The top cover assembly 201 comprises a terminal 201a, the battery cell 202 comprises a battery body 202a and a tab 202b disposed on the battery body 202a, the terminal 201a is connected to the first connection portion 1 of the adapter 100, the battery body 202a is connected to the tab 202b, and the tab 202b is connected to the second connection portion 2 of the adapter 100. The battery 200 having the adapter 100 described in the first aspect can also effectively relieve stress generated by thermal deformation of the adapter 100, avoid pulling on the tab 202b, and thus prevent current path failure, thereby improving the safety performance and yield rate of the battery 200. At the same time, the design of the adapter 100 enables more accurate positioning of the assembly tool and the adapter 100, effectively improving the assembly efficiency and accuracy of the battery 200, as well as increasing the utilization rate of the internal space of the battery 200 and the energy density of the battery 200. Of course, the adapter 100 can also guide and transmit the current of the battery cell 202, facilitating the efficient transmission of electrical energy between the batteries 200.

[0094] In some embodiments, an angle space 3 is formed between the first connecting part 1 and the second connecting part 2. When the battery cell body 202a is arranged in the angle space 3, the tab 202b of the battery cell 202 is connected to the surface of the second connecting part 2 on the side facing away from the angle space 3. This can avoid the raised weld point after the tab 202b is welded to the adapter 100 to damage the diaphragm of the battery cell 202, reduce the occurrence of current short circuit, and thus help improve the yield and safety performance of the battery 200.

[0095] It can be understood that the second connecting portion 2 has a first surface 22 and a second surface 23 that are opposite to each other along the thickness direction. The second surface 23 is the side surface of the second connecting portion 2 that is opposite to the angle space 3, and the first surface 22 is the side surface of the second connecting portion 2 that is opposite to the second surface 23 along the thickness direction. That is, the tab 202b is connected to the second surface 23, and the groove 21 is provided on the first surface 22.

[0096] See also Figure 9In some embodiments, the electrode post 201a includes a positive electrode post 2011 and a negative electrode post 2012, the tab 202b includes a positive tab 2021 and a negative tab 2022, and the adapter 100 includes a positive adapter 101 and a negative adapter 102. The positive adapter 101 is connected to the positive electrode post 2011 and the positive tab 2021, respectively, and the negative adapter 102 is connected to the negative electrode post 2012 and the negative tab 2022, respectively. The thickness of the second connecting portion 2 of the positive adapter 101 is greater than or equal to the thickness of the second connecting portion 2 of the negative adapter 102. Because the positive adapter 101 needs to withstand a large current, a thicker second connecting portion 2 of the positive adapter 101 can effectively improve conductivity and structural stability. In addition, the thinner second connection portion 2 of the negative electrode adapter 102 can reduce internal resistance, thereby improving the current capacity of the battery 200 , which is beneficial to improving the conversion efficiency and service life of the battery 200 .

[0097] Optionally, the thickness ratio of the second connection portion 2 of the positive electrode adapter 101 at the groove 21 to the portions located on both sides of the groove 21 along the second direction F2 is 3 / 5-5 / 7.

[0098] Illustratively, the thickness ratio of the second connecting portion 2 of the positive electrode adapter 101 at the groove 21 to the portions located on both sides of the groove 21 along the second direction F2 includes but is not limited to 3 / 5, 22 / 35, 23 / 35, 24 / 35, 5 / 7, etc., and the embodiments of the present application do not specifically limit this.

[0099] Optionally, the thickness ratio of the second connection portion 2 of the negative electrode adapter 102 at the groove 21 to the portions located on both sides of the groove 21 along the second direction F2 is 1 / 3-3 / 5.

[0100] Illustratively, the thickness ratio of the second connecting portion 2 of the negative electrode adapter 102 at the groove 21 to the portions located on both sides of the groove 21 along the second direction F2 includes, but is not limited to, 1 / 3, 2 / 5, 7 / 15, 8 / 15, 3 / 5, etc., which is not specifically limited in the embodiments of the present application.

[0101] It can be understood that the adapter sheet 100 includes a positive electrode adapter sheet 101 and a negative electrode adapter sheet 102, and the thickness ratio of the second connecting portion 2 of the adapter sheet 100 at the groove 21 to the portions located on both sides of the groove 21 along the second direction F2 satisfies the above-mentioned value range, which can not only reduce the material used in the adapter sheet 100, but also meet the mechanical strength requirements of the adapter sheet 100, and improve the resistivity and conductivity of the adapter sheet 100, thereby helping to improve the conversion efficiency and service life of the battery 200.

[0102] Optionally, the thickness of the portion of the second connecting portion 2 of the positive electrode adapter 101 where the groove 21 is not provided is 2.5 mm-3.5 mm. Exemplarily, it may include but is not limited to 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, etc.

[0103] Optionally, the thickness of the portion of the second connecting portion 2 of the negative electrode adapter 102 where the groove 21 is not provided is 1.5 mm-2.5 mm. Exemplarily, it may include but is not limited to 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, etc.

[0104] When the positive electrode adapter 101 and the negative electrode adapter 102 meet the above-mentioned requirements, they can not only increase the capacity and energy density of the battery 200, but also help to improve the internal resistivity and conductivity of the battery 200, improve the charge and discharge performance of the battery 200, thereby extending the service life of the battery 200 and improving the stability and safety of the battery 200. When the thickness of the positive electrode adapter 101 and the negative electrode adapter 102 is too large, the internal resistance of the battery 200 increases and the space occupied by the battery 200 increases, thereby affecting the current transmission efficiency of the battery 200; when the thickness of the positive electrode adapter 101 and the negative electrode adapter 102 is too small, the mechanical strength of the adapter 100 is reduced, and the positive electrode adapter 101 and the negative electrode adapter 102 are easily deformed by heat, resulting in poor contact between the tab 202b and the positive electrode adapter 101 and the negative electrode adapter 102, thereby affecting the stability and safety of the battery 200.

[0105] See also Figure 10 In a third aspect, an embodiment of the present application discloses an energy storage device 300, which includes a battery 200. The energy storage device 300 having the battery 200 is conducive to improving the safety and stability of the energy storage device 300. The energy storage device 300 having the battery 200 described in the second aspect above can also effectively release the stress generated by the thermal deformation of the adapter 100, avoid the effect of pulling the tab 202b, and thus avoid the occurrence of current path failure, thereby improving the safety performance and yield rate of the battery 200. At the same time, the design of the adapter 100 can make the positioning of the assembly tool and the adapter 100 more accurate, effectively improve the assembly efficiency and assembly accuracy of the battery 200, and improve the utilization rate of the internal space of the battery 200 and the energy density of the battery 200. As a result, it can be beneficial to improve the safety and energy density of the energy storage device 300.

[0106] Optionally, the energy storage device 300 includes a protective shell 301 and a plurality of batteries 200 disposed in the protective shell 301 , and the plurality of batteries 200 are connected in series or in parallel, which is beneficial to improving the safety and stability of the energy storage device 300 .

[0107] There can be multiple energy storage devices 300, each connected in series or in parallel. The multiple energy storage devices 300 are supported and electrically connected using isolation plates (not shown). In this embodiment, "multiple" refers to two or more. An energy storage box may also be provided outside the energy storage device 300 to accommodate the energy storage device 300.

[0108] Optionally, the energy storage device 300 may include, but is not limited to, a single cell, a battery module, a battery pack, a battery system, and the like. The actual application form of the energy storage device 300 provided in the embodiments of this application may be, but is not limited to, the products listed above, and may also be other application forms. The embodiments of this application do not impose strict restrictions on the application form of the energy storage device 300. The embodiments of this application only illustrate the energy storage device 300 as a multi-core battery. When the energy storage device 300 is a single cell, the energy storage device 300 may be at least one of a cylindrical battery, a prismatic battery, and the like.

[0109] The following is a brief description of the use of the adapter 100 during the assembly of the battery 200:

[0110] First, the top cover assembly 201 is placed upside down in the jig, and the first connecting parts 1 of the positive electrode adapter 101 and the negative electrode adapter 102 are respectively connected to the positive electrode column 2011 and the negative electrode column 2012 of the top cover assembly 201, so that a storage space is formed between the top cover assembly 201, the positive electrode adapter 101 and the negative electrode adapter 102. Then, the assembly tool is inserted into the groove 21 from the second end 2b of the second connecting part 2 to the first end 2a, providing support for the adapter 100 during the subsequent bending and welding of the tab 202b. Finally, the battery body 202a is placed into the storage space from the second end 2b to the first end 2a, and the positive electrode tab 2021 is welded to the positive electrode adapter 101, and the negative electrode tab 2022 is welded to the negative electrode adapter 102, thereby forming a battery 200 for use in the energy storage device 300.

[0111] See also Figure 11In the fourth aspect, the embodiment of the present application further discloses an electrical device 400, which includes an energy storage device 300. The electrical device 400 having the energy storage device 300 described in the third aspect can also effectively release the stress generated by the thermal deformation of the adapter 100, avoid the effect of pulling the tab 202b, and thus avoid the occurrence of current path failure, thereby improving the safety performance and yield rate of the battery 200. At the same time, the design of the adapter 100 can make the positioning of the assembly tool and the adapter 100 more accurate, effectively improve the assembly efficiency and assembly accuracy of the battery 200, and improve the utilization rate of the internal space of the battery 200 and the energy density of the battery 200. As a result, it can be beneficial to improve the safety and energy density of the electrical device 400.

[0112] The embodiment of the present application is described by taking a household energy storage scenario in an electrical device 400 as an example, but the electrical device 400 of the present application is not limited to a household energy storage scenario.

[0113] The present application provides an electrical device 400, which includes an electric energy conversion device 401 (photovoltaic panel), a first user load 402 (street lamp), a second user load 403 (such as air conditioner and other household appliances), and an energy storage device 300. The energy storage device 300 is a small energy storage box that can be mounted on an outdoor wall. Specifically, the photovoltaic panel can convert solar energy into electrical energy during periods of low electricity prices. The energy storage device 300 is used to store the electrical energy and supply it to street lamps and household appliances for use during peak electricity prices, or to provide power when the power grid is outage / power outage.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An adapter for a battery, characterized in that: The adapter comprises: a first connecting portion configured to be connected to a terminal of the battery; a second connecting portion, the second connecting portion being configured to be connected to a tab of the battery, the second connecting portion comprising a first end and a second end opposite to each other, the first end being connected to the first connecting portion at an angle, the second end being provided with a groove, the groove penetrating an edge of the second end of the second connecting portion along a first direction, the groove being configured to have two opposing side walls in a second direction, and having a bottom wall surface along a thickness direction of the second connecting portion, so that a portion of the second connecting portion at the groove and portions located on both sides of the groove in the second direction form a thickness difference; The second direction intersects with the first direction.

2. The adapter according to claim 1, characterized in that: An angle space is formed between the first end and the first connecting portion, and the groove is provided on a side surface of the second connecting portion located in the angle space.

3. The adapter according to claim 2, wherein: The first end and the second end are the two ends of the second connecting part along the first direction, and the groove has a first side wall and a second side wall along the second direction. The first side wall and / or the second side wall are inclined so that the groove is formed into a flared groove that gradually flares from the first end to the second end in the second direction.

4. The adapter according to claim 3, characterized in that: The groove has a first side and a second side opposite to each other along the first direction. In the second direction, a length ratio of the first side to the second side is 1 / 2-7 / 8.

5. The adapter according to claim 4, characterized in that: In the second direction, the length of the first side is 5 mm-7 mm, and / or the length of the second side is 8 mm-10 mm.

6. The adapter according to any one of claims 1 to 5, characterized in that: The thickness ratio of the second connecting portion of the adapter plate at the groove to the portions located on both sides of the groove along the second direction is 1 / 3-5 / 7.

7. The adapter according to any one of claims 1 to 5, characterized in that: The groove is located at a middle portion of the second connecting portion along the second direction.

8. A battery, characterized in that: It includes a top cover assembly, a battery cell and a adapter as described in any one of claims 1 to 7, the top cover assembly includes a pole, the battery cell includes a battery cell body and a pole ear arranged on the battery cell body, the pole is connected to the first connecting part of the adapter, and the pole ear is connected to the second connecting part of the adapter.

9. The battery according to claim 8, characterized in that When an angle space is formed between the first connecting portion and the second connecting portion, the tab is connected to a surface of the second connecting portion that is away from the angle space.

10. The battery according to claim 8 or 9, characterized in that The electrode column includes a positive electrode column and a negative electrode column, the electrode tab includes a positive electrode tab and a negative electrode tab, and the adapter includes a positive electrode adapter and a negative electrode adapter. The positive electrode adapter is respectively connected to the positive electrode column and the positive electrode tab, and the negative electrode adapter is respectively connected to the negative electrode column and the negative electrode tab. The thickness of the second connecting part of the positive electrode adapter is greater than or equal to the thickness of the second connecting part of the negative electrode adapter.

11. The battery according to claim 10, characterized in that The thickness ratio of the second connecting portion of the positive electrode adapter at the groove to the portions located on both sides of the groove along the second direction is 3 / 5-5 / 7; and / or, The thickness ratio of the second connection portion of the negative electrode adapter plate at the groove to the portions located on both sides of the groove along the second direction is 1 / 3-3 / 5.

12. The battery according to claim 11, characterized in that The thickness of the portion of the second connecting portion of the positive electrode adapter plate where the groove is not provided is 2.5 mm to 3.5 mm; and / or, The thickness of a portion of the second connecting portion of the negative electrode adapter plate where the groove is not provided is 1.5 mm to 2.5 mm.

13. An energy storage device, characterized in that: Comprising the battery according to any one of claims 8 to 12.

14. An electrical device, characterized in that: Comprising the energy storage device as claimed in claim 13.

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