Connection structure and battery

Abstract

The utility model provides a connection structure and a battery. The connecting structure comprises a connecting main body and two tab connecting parts, the connecting main body is used for being connected with the top cover assembly, the connecting main body comprises a first surface and a second surface which are oppositely arranged in the first direction, the second surface is used for being connected with the top cover assembly, and the tab connecting parts are used for being connected with tabs of a core package. The tab connecting parts are connected to the two opposite sides, in the second direction, of the connecting body, the sides, deviating from each other, of the two tab connecting parts are used for being connected with tabs, each tab connecting part comprises a first connecting part and a second connecting part, and in the first direction, the first connecting part protrudes out of the first face, and the second connecting part protrudes out of the second face. According to the invention, the sides, deviating from each other, of the two tab connecting parts are used for being connected with the tabs, and the first connecting parts and the second connecting parts of the tab connecting parts respectively protrude out of the first surface and the second surface of the connecting main body, so that the risk of bending deformation of the tab connecting parts due to unbalanced stress can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a connection structure and a battery. Background Technology

[0002] With the development of battery technology, the demand for battery energy density is gradually increasing, and battery thickness is also gradually increasing. To improve the battery's overcurrent capacity and the effective welding area of ​​the tabs, dual-cell or multi-cell batteries are usually designed to meet the greater energy density requirements. During battery manufacturing, a connecting structure is needed to electrically connect the tabs of the cell pack to the top cover assembly. This connecting structure usually has a tab connection part for connecting with the tabs of the cell pack. Since the material used in the connecting structure is generally relatively soft, the tab connection part is prone to bending and deformation under the force applied by the clamp when the clamp is used to hold the tabs during the welding process, thus affecting the connection effect between the tab connection part and the tabs of the cell pack. Utility Model Content

[0003] The embodiments of this application provide a connection structure and a battery, which can improve the problem that the electrode connection part in the connection structure is prone to bending and deformation during the welding process with the electrode.

[0004] In a first aspect, embodiments of this application provide a connection structure for a battery, the battery including a top cover assembly and a core pack, the connection structure being used to connect the tabs of the core pack to the top cover assembly; the connection structure includes:

[0005] A connecting body for connecting to the top cover assembly, the connecting body including a first surface and a second surface disposed opposite to each other along a first direction, the second surface being used for connecting to the top cover assembly;

[0006] Two tab connection portions are used to connect with the tabs of the core package. The tab connection portions are connected to opposite sides of the connection body in a second direction, which forms an angle with the first direction. The side of the two tab connection portions that are opposite to each other is used to connect with the tab. The tab connection portion includes a first connection portion and a second connection portion. In the first direction, the first connection portion protrudes from the first surface, and the second connection portion protrudes from the second surface.

[0007] In one embodiment, in the first direction, the height of the first connecting part is H1, the height of the second connecting part is H2, and the thickness of the connecting body is D. The height of the first connecting part, the height of the second connecting part, and the thickness of the connecting body satisfy the relationship: |H1-H2|≤2D.

[0008] In one embodiment, the connection structure further includes an insulating body located on a first surface of the connection body and between the two tab connection portions, the insulating body being connected to the connection body.

[0009] In one embodiment, a first support portion is provided on the side of the insulating body facing the tab connection portion, and the first support portion abuts against the corresponding tab connection portion.

[0010] In one embodiment, in the first direction, the first support portion protrudes from the side of the insulating body opposite to the connecting body; and / or,

[0011] In the first direction, the first support portion protrudes from the side of the insulating body facing the connecting body.

[0012] In one embodiment, in the first direction, the height of the first support portion is less than or equal to the height of the portion of the tab connection portion protruding from the first surface.

[0013] Secondly, embodiments of this application provide a battery, comprising:

[0014] The outer shell has a receiving cavity;

[0015] The core package is disposed within the receiving cavity;

[0016] A top cover assembly, connected to the housing, the top cover assembly sealing the receiving cavity; and,

[0017] The connection structure described in any of the preceding claims is located between the top cover assembly and the core package, and the connection structure connects the tabs of the core package to the top cover assembly.

[0018] In one embodiment, the top cover assembly includes a top cover and an insulating member, the insulating member being located between the top cover and the connecting structure, and a second support portion protruding from the side of the insulating member facing the connecting structure, the second support portion being located between two tab connecting portions of the connecting structure and abutting against the tab connecting portions.

[0019] In one embodiment, the second support portion includes two sub-support portions spaced apart along a second direction, and the two sub-support portions respectively abut against the corresponding tab connection portion.

[0020] In one embodiment, in a first direction, the height of the tabs in the core package is less than or equal to the height of the tab connection portion in the connection structure; and / or,

[0021] The battery includes two core packs distributed along a second direction, wherein the distance between the tabs of the two core packs is greater than or equal to the width of the connection structure.

[0022] The beneficial effects of the embodiments of this application are as follows:

[0023] In the embodiments of this application, electrode connecting portions are respectively provided on both sides of the connecting body along the second direction of the connecting structure, so that the opposite sides of the two electrode connecting portions are used to connect with the electrode, and the first connecting portion of the electrode connecting portion protrudes from the first surface of the connecting body, and the second connecting portion protrudes from the second surface of the connecting body. That is, the electrode connecting portions are set to protrude from the opposite sides of the connecting body, and the electrode connecting portions and the connecting body are in an I-shape. The connecting body and the first connecting portion and the second connecting portion of the electrode connecting portion are partially connected. When the two tabs are clamped one by one to the two sides of the two tab connection parts to connect the tabs together, the clamp applies a clamping force to the two tab connection parts, while the connecting body applies a supporting force to the tab connection parts in the opposite direction of the clamping force. This supporting force acts on the part between the first and second connection parts of the tab connection parts, so that the support point of the supporting force acting on the tab connection parts is located as close as possible to the middle area of ​​the tab connection parts in the first direction. While balancing the clamping force, the bending moment on the tab connection parts is minimized, which helps to reduce the risk of bending deformation of the tab connection parts due to uneven force. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is an exploded structural diagram of a connection structure provided in an embodiment of this application;

[0026] Figure 2 This is provided by the embodiments of this application. Figure 1 Enlarged structural diagram of region A in the middle;

[0027] Figure 3 This is a schematic diagram of the exploded structure of a battery provided in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the corresponding structure of a top cover assembly and a connecting structure provided in an embodiment of this application;

[0029] Figure 5This is a schematic diagram of the core package and connecting structure before and after welding, provided in an embodiment of this application;

[0030] Figure 6 This is a schematic diagram illustrating the dimensional relationship between a connection structure and a core package, provided in an embodiment of this application.

[0031] Figure 7 This is an exploded structural diagram of another connection structure provided in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10. Battery;

[0034] 100, connecting structure; 110, connecting body; 111, first surface; 112, second surface; 120, electrode connecting part; 121, first connecting part; 122, second connecting part; 130, insulating body; 140, first support part; X, first direction; Y, second direction;

[0035] 200, outer casing; 210, receiving cavity;

[0036] 300, core package; 310, electrode tab;

[0037] 400, Top cover assembly; 410, Top cover; 420, Insulator; 430, Second support; 431, Sub-support. Detailed Implementation

[0038] The technical solutions of the embodiments of this application 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 application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0039] First, this application provides a connection structure for a battery, such as... Figure 3 As shown, the battery 10 includes a top cover assembly 400 and a cell pack 300. The connection structure 100 is used to connect the tabs 310 of the cell pack 300 to the top cover assembly 400 to realize the electrical connection between the cell pack 300 and the top cover assembly 400, thereby facilitating the electrical connection design between the battery 10 and the external circuit.

[0040] like Figure 1 and Figure 2 As shown, the connection structure 100 includes a connection body 110 for connecting to the top cover assembly 400. The connection body 110 includes a first surface 111 and a second surface 112 disposed opposite to each other along a first direction X. The second surface 112 is used for connecting to the top cover assembly 400. That is, when the connection structure 100 is applied to the battery 10, the first surface 111 of the connection body 110 faces the core pack 300, and the second surface 112 of the connection body 110 faces the top cover assembly 400.

[0041] The connecting structure 100 includes two tab connecting portions 120, which are used to connect with the tabs 310 of the core package 300. The tab connecting portions 120 are connected to opposite sides of the connecting body 110 in the second direction Y, which forms an angle with the first direction X. That is, the tabs 310 of the core package 300 are connected to the tab connecting portions 120 of the connecting structure 100, the tab connecting portions 120 are connected to the connecting body 110, and the connecting body 110 is then connected to the top cover assembly 400, thereby realizing the electrical connection between the tabs 310 of the core package 300 and the top cover assembly 400. In this embodiment, the first direction X can be regarded as the thickness direction of the connecting body 110, and the second direction Y can be regarded as the width direction of the connecting body 110.

[0042] The two tab connecting portions 120, located opposite to each other, are respectively used to connect to the tabs 310 of the core package 300. Furthermore, each tab connecting portion 120 includes a first connecting portion 121 and a second connecting portion 122. In the first direction X, the first connecting portion 121 of the tab connecting portion 120 protrudes from the first surface 111 of the connecting body 110, and the second connecting portion 122 of the tab connecting portion 120 protrudes from the second surface 112 of the connecting body 110. That is, the tab connecting portion 120 and the connecting body 110 together have an "I"-shaped cross-section in the second direction Y.

[0043] It should be noted that when welding the tabs 310 and the tab connection parts 120 of the core package 300, the two tabs 310 of the core package 300 are located on the opposite side of the two tab connection parts 120, that is, the tabs 310 of the core package 300 are located on the outer side of the tab connection parts 120. The tabs 310 and the tab connection parts 120 of the core package 300 are clamped by a clamp so that the two tabs 310 of the core package 300 are tightly attached to the two tab connection parts 120 before laser welding is performed.

[0044] In this embodiment of the application, electrode connecting portions 120 are respectively provided on both sides of the connecting body 110 of the connecting structure 100 along the second direction Y. The opposite sides of the two electrode connecting portions 120 are used to connect with the electrode 310. The first connecting portion 121 of the electrode connecting portion 120 protrudes from the first surface 111 of the connecting body 110, and the second connecting portion 122 protrudes from the second surface 112 of the connecting body 110. That is, the electrode connecting portions 120 are set to protrude from the opposite sides of the connecting body 110. The electrode connecting portions 120 and the connecting body 110 are in an I-shape. The connecting body 110 and the first connecting portion 121 and the second connecting portion 122 of the electrode connecting portion 120 are partially connected.

[0045] When the two tabs 310 are clamped one-to-one on both sides of the two tab connecting parts 120 by the clamp to connect the tab connecting parts 120 and the tabs 310 together, the clamp applies a clamping force to the two tab connecting parts 120, and the connecting body 110 applies a supporting force to the tab connecting parts 120 in the opposite direction to the clamping force. The supporting force acts on the part between the first connecting part 121 and the second connecting part 122 of the tab connecting parts 120, so that the support point of the supporting force acting on the tab connecting parts 120 is located as close as possible to the middle area of ​​the tab connecting parts 120 in the first direction X. While balancing the clamping force, the bending moment on the tab connecting parts 120 is minimized, which helps to reduce the risk of the tab connecting parts 120 bending and deforming due to uneven force.

[0046] Optional, such as Figure 2 As shown, the tab connection 120 consists of three parts: a first connection 121, a second connection 122, and a part connected to the connection body 110. The height of the tab connection 120 is the sum of the height of the first connection 121, the height of the second connection 122, and the thickness of the connection body 110.

[0047] In the first direction X, the height of the first connecting part 121 is H1, the height of the second connecting part 122 is H2, and the thickness of the connecting body 110 is D. The height H1 of the first connecting part 121, the height H2 of the second connecting part 122, and the thickness D of the connecting body 110 satisfy the relationship: |H1-H2|≤2D. If the absolute value of the difference between the height H1 of the first connecting part 121 and the height H2 of the second connecting part 122 is too large, it will cause one of the heights H1 of the first connecting part 121 and H2 of the second connecting part 122 to be too small. That is, the connection position between the connecting body 110 and the tab connecting part 120 is too close to one side of the tab connecting part 120 in the first direction X. As a result, when the tab 310 and the tab connecting part 120 are clamped by the clamp during the welding process, the support point of the connecting body 110 on the tab connecting part 120 is too close to the edge of the tab connecting part 120 in the first direction X. This increases the risk of the tab connecting part 120 bending and deforming due to uneven force during the welding process.

[0048] In this embodiment, by setting the height H1 of the first connecting part 121, the height H2 of the second connecting part 122, and the thickness D of the connecting body 110 to |H1-H2|≤2D, the support point of the connecting body 110 to the tab connecting part 120 during the welding process is located near the middle area of ​​the tab connecting part 120, thereby helping to reduce the risk of the tab connecting part 120 bending and deforming due to force.

[0049] Specifically, for example, if the height of the tab connection 120 is 5mm and the thickness D of the connecting body 110 is 1mm, when the connecting body 110 is located in the center of the tab connection 120, the height H1 of the first connecting part 121 is 2mm and the height H2 of the second connecting part 122 is 2mm; when the connection position of the connecting body 110 and the tab connection 120 is shifted towards the first connecting part 121, the height H1 of the first connecting part 121 can be 1mm and the height H2 of the second connecting part 122 is 3mm; when the connection position of the connecting body 110 and the tab connection 120 is shifted towards the second connecting part 122, the height H1 of the first connecting part 121 can be 3mm and the height H2 of the second connecting part 122 is 1mm.

[0050] It should be noted that the connection position between the connecting body 110 and the tab connecting part 120, as well as the specific height values ​​corresponding to the first connecting part 121 and the second connecting part 122, can be selected and adjusted according to actual design requirements, and no special restrictions are imposed here.

[0051] Optional, such as Figure 1As shown, the connection structure 100 also includes an insulating body 130, which is located on the first surface 111 of the connection body 110 and between the two tab connection portions 120. The insulating body 130 is connected to the connection body 110. Since the first surface 111 of the connection body 110 faces the core pack 300, the core pack 300 may move up and down relative to the connection body 110 during the use of the battery 10, which may lead to a short circuit risk. By providing the insulating body 130 on the first surface 111 of the connection body 110 and positioning it between the two tab connection portions 120, the insulating body 130 can isolate the connection body 110 from the core pack 300, thereby reducing the risk of a short circuit.

[0052] In some embodiments, a first support portion 140 is provided on the side of the insulating body 130 facing the tab connection portion 120, and the first support portion 140 abuts against the corresponding tab connection portion 120. That is, the insulating body 130 has first support portions 140 formed on opposite sides in the first direction X. During the welding process, when the tab 310 of the core package 300 and the tab connection portion 120 are clamped by a jig, the first support portion 140 can support the tab connection portion 120 to further reduce the risk of the tab connection portion 120 bending and deforming due to force during the welding process.

[0053] In the first direction X, the first support portion 140 protrudes from the side of the insulating body 130 away from the connecting body 110. That is, the cross-section of the first support portion 140 and the insulating body 130 as a whole in the second direction Y is "U" shaped, and the insulating body 130 can be directly connected to the first surface 111 of the connecting body 110. In other words, the overall shape of the first support portion 140 and the insulating body 130 is consistent with the overall shape of the first connecting portion 121 and the connecting body 110.

[0054] Or, such as Figure 7 As shown, in the first direction X, the first support portion 140 protrudes from the side of the insulating body 130 facing the connecting body 110. That is, the cross-section of the first support portion 140 and the insulating body 130 as a whole in the second direction Y is also "U" shaped. However, there is a gap between the insulating body 130 and the connecting body 110. The insulating body 130 needs to be indirectly connected to the connecting body 110 through the first support portion 140. In other words, the overall shape of the first support portion 140 and the insulating body 130 is consistent with the overall shape of the second connecting portion 122 and the connecting body 110.

[0055] Alternatively, in the first direction X, the first support portion 140 protrudes from both the side of the insulating body 130 away from the connecting body 110 and the side of the insulating body 130 facing the connecting body 110. That is, the cross-section of the first support portion 140 and the insulating body 130 as a whole in the second direction Y is "I" shaped. In other words, the overall shape of the first support portion 140 and the insulating body 130 is consistent with the overall shape of the tab connection portion 120 and the connecting body 110. This makes it possible for the first support portion 140 to support the tab connection portion 120 when the tab 310 and the tab connection portion 120 are clamped by a jig during the welding process. The support point of the insulating body 130 on the first support portion 140 is located in the middle area of ​​the first support portion 140, which helps to further reduce the risk of the tab connection portion 120 bending and deforming due to force.

[0056] It should be noted that the overall structural shape of the insulating body 130 and the first support part 140 can be selected and adjusted according to actual design requirements. It is only necessary to ensure that the setting of the insulating body 130 and the first support part 140 can effectively reduce the risk of bending and deformation of the electrode connection part 120 due to stress during the welding process. No special restrictions are imposed here.

[0057] In other embodiments, in the first direction X, the height of the first support portion 140 is less than or equal to the height of the portion of the tab connection portion 120 protruding from the first surface 111. That is, the orthographic projection of the first support portion 140 on the tab connection portion 120 is located on opposite sides of the tab connection portion 120 in the first direction X. This allows the first support portion 140 to support the tab connection portion 120 while avoiding interference with the welding of the tab connection portion 120 and the tab 310, thereby ensuring the connection stability between the connection structure 100 and the core package 300.

[0058] Correspondingly, the length of the first support portion 140 can be set to be greater than or equal to the length of the tab connection portion 120, so that the first support portion 140 and the tab connection portion 120 have sufficient contact area in the length direction, thereby improving the support effect of the first support portion 140 on the tab connection portion 120.

[0059] Secondly, this application provides a battery including a connection structure. The specific structure of the connection structure is as described in the above embodiments. Since this battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0060] like Figure 3As shown, the battery 10 includes a housing 200, a core pack 300, a top cover assembly 400, and a connecting structure 100. The housing 200 has a receiving cavity 210, the core pack 300 is disposed in the receiving cavity 210, the top cover assembly 400 is connected to the housing 200 and seals the receiving cavity 210, and the connecting structure 100 is located between the top cover assembly 400 and the core pack 300. The connecting structure 100 connects the tabs 310 of the core pack 300 to the top cover assembly 400 to realize the electrical connection between the core pack 300 and the top cover assembly 400, thereby facilitating the electrical connection design between the battery 10 and the external circuit.

[0061] Specifically, such as Figure 1 As shown, in this embodiment of the application, the connection structure 100 includes a connection body 110 and two tab connection portions 120. The connection body 110 is used to connect with the top cover assembly 400. The connection body 110 includes a first surface 111 and a second surface 112 disposed opposite to each other along the first direction X. The second surface 112 is used to connect with the top cover assembly 400. The tab connection portions 120 are used to connect with the tabs 310 of the core package 300. The tab connection portions 120 are connected to the opposite sides of the connection body 110 in the second direction Y. The second direction Y forms an angle with the first direction X. In the first direction X, the opposite sides of the tab connection portions 120 protrude from the first surface 111 and the second surface 112, respectively. This application sets the tab connection portion 120 to protrude from the opposite sides of the connecting body 110, that is, the tab connection portion 120 and the connecting body 110 are in an I-shape. This makes it possible for the connecting body 110 to support the tab connection portion 120 in the middle area of ​​the tab connection portion 120 when the tab 310 and the tab connection portion 120 are clamped by a jig during the welding process. This helps to reduce the risk of the tab connection portion 120 bending and deforming due to force.

[0062] Optional, such as Figure 4 As shown, the top cover assembly 400 includes a top cover 410 and an insulating member 420. The insulating member 420 is located between the top cover 410 and the connecting structure 100 to isolate the top cover 410 from the connecting structure 100 and avoid the risk of short circuit. It should be noted that the top cover 410 is provided with a positive terminal and a negative terminal, and the core pack 300 includes a positive electrode tab and a negative electrode tab. Correspondingly, the battery 10 includes two connecting structures 100, which are used to connect the positive electrode tab to the positive terminal and the negative electrode tab to the negative terminal, respectively, to realize the electrical connection between the core pack 300 and the top cover 410.

[0063] The insulating component 420 has a second support portion 430 protruding from the side facing the connecting structure 100. The second support portion 430 is located between the two tab connecting portions 120 of the connecting structure 100 and abuts against the tab connecting portions 120. That is, when the connecting structure 100 is welded to the top cover assembly 400, the second support portion 430 can directly extend between the two tab connecting portions 120 and abut against the tab connecting portions 120. When the tabs 310 and the tab connecting portions 120 are subsequently clamped using a clamp, the second support portion 430 can support the tab connecting portions 120 to reduce the risk of the tab connecting portions 120 bending and deforming due to force.

[0064] In some embodiments, the second support portion 430 includes two sub-support portions 431 spaced apart along the second direction Y. The two sub-support portions 431 respectively abut against the corresponding tab connection portion 120. That is, the cross-section of the second support portion 430 and the insulating member 420 together in the second direction Y is U-shaped, so as to achieve a lightweight design of the top cover assembly 400 while supporting the tab connection portion 120, thereby reducing the overall weight of the battery 10.

[0065] Specifically, such as Figure 5 As shown, when assembling the battery 10, the second surface 112 of the connecting body 110 of the connecting structure 100 is first attached to the terminal post on the top cover 410 and laser welded to achieve the connection between the connecting structure 100 and the top cover assembly 400. Meanwhile, to prevent misalignment after the core pack 300 is assembled, the core pack 300 is pre-assembled and the electrode tabs 310 to be welded are reserved before welding the core pack 300 to the connecting structure 100 (e.g., ...). Figure 5 (a) As shown in the diagram; after welding the connecting structure 100 and the top cover assembly 400, the tabs 310 of the core package 300 are then attached to the outer surface of the tab connecting portion 120 in the connecting structure 100. Simultaneously, a clamp is used to hold the tabs 310 and the tab connecting portion 120 of the core package 300, and laser welding is performed to achieve the connection between the connecting structure 100 and the core package 300, thereby realizing the electrical connection between the core package 300 and the top cover assembly 400 (as shown in diagram 400). Figure 5 (b) As shown; Finally, the top cover assembly 400, the connecting structure 100 and the core package 300 are placed into the receiving cavity 210 of the outer casing 200, and the receiving cavity 210 is sealed by the top cover assembly 400, thereby completing the assembly of the battery 10.

[0066] In this embodiment, the connecting structure 100 is first connected to the top cover assembly 400, and then connected to the core package 300. Compared with the traditional assembly process of flipping the core package 300 back and forth, this reduces the risk of breakage of the tab 310 of the core package 300. It also avoids misalignment of the core package 300 during the flipping process. In addition, the tab connection part 120 on the connecting structure 100 can also ensure effective welding of the tab 310 of the core package 300 to the connecting structure 100, thereby improving the current carrying capacity of the tab 310 of the core package 300.

[0067] like Figure 6 As shown, the height L1 of the tab 310 of the core package 300 is less than or equal to the height L2 of the tab connection portion 120. When welding the tab 310 of the core package 300 to the tab connection portion 120, the tab 310 of the core package 300 is located on the side opposite to the two tab connection portions 120, that is, the tab 310 of the core package 300 is located on the outer side of the tab connection portion 120. The tab 310 of the core package 300 and the tab connection portion 120 are clamped by a clamp to make the tab 310 of the core package 300 and the tab connection portion 120 fit tightly together, and then laser welding is performed. By setting the height L1 of the tab 310 of the core pack 300 to be less than or equal to the height L2 of the tab connection part 120, it is possible to avoid the tab 310 bending and deforming during the welding process due to the excessive height of the tab 310 of the core pack 300. This would not only be detrimental to the welding of the tab 310 and the tab connection part 120, but would also prevent the subsequent insertion into the casing, thus affecting the normal assembly of the battery 10.

[0068] Furthermore, when the battery 10 includes two core packs 300 distributed along the second direction Y, the distance L3 between the tabs 310 of the two core packs 300 in the second direction Y is greater than or equal to the width L4 of the connecting structure 100. Since the tabs 310 of the core pack 300 need to be located on opposite sides of the two tab connecting portions 120 during welding, i.e., the tabs 310 of the core pack 300 need to be located on the outer side of the tab connecting portion 120, and the tabs 310 of the core pack 300 and the tab connecting portion 120 are clamped using a jig to ensure a tight fit between the tabs 310 of the core pack 300 and the tab connecting portion 120, laser welding is then performed. By setting the distance L3 between the tabs 310 of the two core packages 300 to be greater than or equal to the width L4 of the connecting structure 100, it can be ensured that the tabs 310 of the core package 300 fit against the outer side of the tab connecting part 120. Even if the width L4 of the connecting structure 100 is less than the distance L3 between the tabs 310 of the two core packages 300, the tabs 310 of the core package 300 can still tilt towards the tab connecting part 120 under the action of the clamp and fit against the outer side of the tab connecting part 120, thereby ensuring the effective connection between the tabs 310 and the tab connecting part 120.

[0069] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A connection structure, characterized in that, The connection structure is used for a battery, the battery including a top cover assembly and a core pack, the connection structure being used to connect the tabs of the core pack to the top cover assembly; the connection structure includes: A connecting body for connecting to the top cover assembly, the connecting body including a first surface and a second surface disposed opposite to each other along a first direction, the second surface being used for connecting to the top cover assembly; Two tab connection portions are used to connect with the tabs of the core package. The tab connection portions are connected to opposite sides of the connection body in a second direction, which forms an angle with the first direction. The side of the two tab connection portions that are opposite to each other is used to connect with the tab. The tab connection portion includes a first connection portion and a second connection portion. In the first direction, the first connection portion protrudes from the first surface, and the second connection portion protrudes from the second surface.

2. The connection structure according to claim 1, characterized in that, In the first direction, the height of the first connecting part is H1, the height of the second connecting part is H2, and the thickness of the connecting body is D. The height of the first connecting part, the height of the second connecting part, and the thickness of the connecting body satisfy the relationship: |H1-H2|≤2D.

3. The connection structure according to claim 1, characterized in that, The connection structure further includes an insulating body, which is located on the first side of the connection body and between the two electrode connecting portions, and the insulating body is connected to the connection body.

4. The connection structure according to claim 3, characterized in that, The insulating body has a first support portion on the side facing the electrode connection portion, and the first support portion abuts against the corresponding electrode connection portion.

5. The connection structure according to claim 4, characterized in that, In the first direction, the first support portion protrudes from the side of the insulating body opposite to the connecting body; and / or, In the first direction, the first support portion protrudes from the side of the insulating body facing the connecting body.

6. The connection structure according to claim 4, characterized in that, In the first direction, the height of the first support portion is less than or equal to the height of the first connecting portion.

7. A battery, characterized in that, include: The outer shell has a receiving cavity; The core package is disposed within the receiving cavity; A top cover assembly, connected to the housing, seals the receiving cavity; as well as, The connection structure according to any one of claims 1 to 6, wherein the connection structure is located between the top cover assembly and the core package, and the connection structure connects the tabs of the core package to the top cover assembly.

8. The battery according to claim 7, characterized in that, The top cover assembly includes a top cover and an insulating member. The insulating member is located between the top cover and the connecting structure. A second support portion protrudes from the side of the insulating member facing the connecting structure. The second support portion is located between the two tab connecting portions of the connecting structure and abuts against the tab connecting portions.

9. The battery according to claim 8, characterized in that, The second support portion includes two sub-support portions spaced apart along a second direction, and the two sub-support portions respectively abut against the corresponding electrode connecting portions.

10. The battery according to claim 7, characterized in that, In the first direction, the height of the tabs in the core package is less than or equal to the height of the tab connection portion in the connection structure; and / or, The battery includes two core packs distributed along a second direction, wherein the distance between the tabs of the two core packs is greater than or equal to the width of the connection structure.

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