Battery and electric device
By employing a finger-like structure in the battery to achieve multi-point contact connection between the battery cell and the busbar, the problem of insufficient conductive connection performance between the battery cell and the busbar is solved, thereby improving the safety and reliability of the battery.
Patent Information
- Application Number
- CN202423100457.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-16
AI Technical Summary
How to improve the conductivity connection between individual battery cells and the busbar to enhance battery safety and reliability.
The device employs a contact finger structure, including a body and contact finger pieces. By having the body abut against the conductive groove and the contact finger pieces abut against the insertion protrusion, a reliable conductive connection between the battery cell and the busbar is achieved, and multi-point contact is used to reduce contact resistance.
It improves the safety and reliability of the battery, reduces contact resistance through multi-point contact, and enhances the battery's conductivity.
Smart Images
Figure CN223843128U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery manufacturing technology, and more specifically, to a battery and an electrical device. Background Technology
[0002] With the rapid development of the new energy industry, the manufacturing process of lithium batteries is constantly improving, which also puts forward higher requirements for the reliability of lithium batteries.
[0003] During battery assembly, multiple battery cells need to be connected in series or parallel via busbars to achieve the rated output power. The conductivity of the connection between the battery cells and the busbars has a significant impact on the safety and reliability of the battery. Therefore, improving the conductivity of the connection between the battery cells and the busbars has become a pressing technical problem to be solved. Utility Model Content
[0004] Therefore, this application proposes a battery and an electrical device that achieves a reliable conductive connection between the battery cell and the busbar, thereby improving the safety and reliability of the battery.
[0005] The battery according to a first aspect embodiment of this application includes: a battery cell including a terminal post, the terminal post including a conductive groove; a bus including a plug-in protrusion; a contact structure including a body and contact pieces, the edge of the body extending to form a plurality of contact pieces, the contact structure being disposed inside the conductive groove, the plug-in protrusion being inserted into the contact structure, the plug-in protrusion being conductively connected to the conductive groove through the contact structure; wherein, one of the body and the contact pieces abuts against the conductive groove, and the other abuts against the plug-in protrusion.
[0006] Optionally, multiple first contact pieces and multiple second contact pieces are formed on both sides of the body, with the multiple first contact pieces spaced apart along the extension direction of the contact structure, and the multiple second contact pieces spaced apart along the extension direction of the contact structure.
[0007] Optionally, the first and second contact fingers are staggered along the extension direction of the contact finger structure.
[0008] Optionally, along the extending direction of the finger structure, the distance between two adjacent first finger pieces is W, and the misalignment distance between the first finger piece and the second finger piece is e, satisfying:
[0009] 0.2W≤e≤0.8W; preferably, e=0.5W.
[0010] Optionally, two bodies are provided, and the two bodies are spaced apart along the depth direction of the conductive groove, and the two bodies are connected by a plurality of contact fingers.
[0011] Optionally, the finger structure extends circumferentially around the insertion protrusion.
[0012] Optionally, along the extending direction of the contact structure, the width of the contact piece is A, the gap between two adjacent contact pieces is B, the dimension of the body is W1 along the groove depth direction of the conductive groove, and the dimension of the contact structure is W, satisfying:
[0013] 0.5≤A≤1mm; and / or
[0014] 0.1mm≤B≤0.4mm; and / or
[0015] 0.2≤W1 / W≤0.44.
[0016] Optionally, the depth of the conductive groove is F, satisfying:
[0017] 1mm≤F≤8mm; preferably, 3mm≤F≤6mm.
[0018] Optionally, the finger structure includes a first side and a second side in the thickness direction. The body includes a first conductive surface on the first side, and the finger sheet includes a second conductive surface on the second side. The finger structure has an uncompressed state and a compressed state inserted between the conductive groove and the insertion protrusion. When the finger structure is in the uncompressed state, the distance between the first conductive surface and the second conductive surface is C. When the finger structure is in the compressed state, the distance between the first conductive surface and the second conductive surface is D, satisfying:
[0019] 0.1≤C≤1.6mm; and / or
[0020] 0.3C≤D≤0.7C.
[0021] The electrical device according to the second aspect of this application includes the battery described in the first aspect of this application, the battery being used to provide electrical energy to the electrical device.
[0022] Compared with existing technologies, this solution has the following advantages:
[0023] The battery contact structure of this application embodiment includes a body and contact pieces. One of the body and the contact pieces abuts against a conductive groove, and the other abuts against a plug-in protrusion. The plug-in protrusion is electrically connected to the conductive groove, thereby realizing the conductive connection between the battery cell and the busbar. Since the body and the contact pieces abut against the conductive groove and the plug-in protrusion respectively, multiple contact pieces achieve multi-point contact, reducing contact resistance, increasing contact pressure, and improving the safety performance and reliability of the battery.
[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the overall structure of the battery provided in an embodiment of this application;
[0027] Figure 2 This is an assembly diagram of the contact structure, insertion protrusion, and conductive groove of the battery provided in an embodiment of this application.
[0028] Figure 3 A partial schematic diagram of the assembled state of the first type of contact structure of the battery provided in the embodiments of this application;
[0029] Figure 4 A schematic diagram of the first type of contact structure of the battery provided in the embodiments of this application;
[0030] Figure 5 A partial schematic diagram of the assembled state of the second form of the finger structure of the battery provided in the embodiments of this application;
[0031] Figure 6 A schematic diagram of a second type of contact structure for a battery provided in an embodiment of this application;
[0032] Figure 7 A schematic diagram of the first form of the contact structure of the battery provided in the embodiment of this application in an unfolded state;
[0033] Figure 8 for Figure 7 AA cross-section view;
[0034] Figure 9 A partial schematic diagram of the first form of the contact structure of the battery provided in the embodiments of this application in an unfolded state;
[0035] Figure 10 This is a schematic diagram of the third type of contact structure of the battery provided in the embodiments of this application.
[0036] Icons: 100 - Finger structure; 110 - Body; 111 - First side; 112 - Second side; 113 - First conductive surface; 120 - Finger piece; 121 - First finger piece; 122 - Second finger piece; 123 - Second conductive surface; 200 - Battery; 210 - Battery cell; 211 - Terminal; 212 - Conductive groove; 220 - Busbar; 221 - Insertion protrusion. Detailed Implementation
[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0038] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0039] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments of this application, the battery 200 includes a battery cell 210, a busbar 220, and a contact structure 100. The battery cell 210 includes a terminal post 211, which includes a conductive groove 212. The busbar 220 includes a plug-in protrusion 221. The contact structure 100 includes a body 110 and contact pieces 120. The edge of the body 110 extends to form a plurality of contact pieces 120. The contact structure 100 is disposed inside the conductive groove 212. The plug-in protrusion 221 is inserted into the contact structure 100 and is electrically connected to the conductive groove 212 through the contact structure 100. One of the body 110 and the contact piece 120 abuts against the conductive groove 212, and the other abuts against the plug-in protrusion 221.
[0040] The surface of the pole post 211 is recessed along the second direction Z to form a conductive groove 212. When the contact structure 100 is disposed inside the conductive groove 212, the contact structure 100 is sleeved on the insertion protrusion 221. The width direction of the contact structure 100 extends along the second direction Z. The body 110 may form multiple contact pieces 120 only on one side edge along the second direction Z, or it may extend on or along both sides edge along the second direction Z to form multiple contact pieces 120 respectively.
[0041] The body 110 and the finger piece 120 of the finger structure 100 abut against the conductive groove 212 on one side in the thickness direction, and abut against the insertion protrusion 221 on the other side; as Figure 3 and Figure 4 As shown, the body 110 can abut against the conductive groove 212 with its body facing outwards, and the contact finger 120 can abut against the insertion protrusion 221 with its contact finger facing inwards; as Figure 5 and Figure 6 As shown, the body 110 can also abut against the insertion protrusion 221 with the body facing inward, and the contact finger 120 can abut against the conductive groove 212 with the contact finger facing outward.
[0042] The contact structure 100 of the battery 200 in this embodiment includes a body 110 and contact pieces 120. One of the body 110 and the contact pieces 120 abuts against a conductive groove 212, and the other abuts against a plugging protrusion 221, thus electrically connecting the plugging protrusion 221 and the conductive groove 212, thereby achieving a conductive connection between the battery cell 210 and the busbar 220. Since the body 110 and the contact pieces 120 abut against the conductive groove 212 and the plugging protrusion 221 respectively, multiple contact pieces 120 achieve multi-point contact, reducing contact resistance, increasing contact pressure, and improving the safety performance and reliability of the battery 200.
[0043] In some embodiments of this application, the finger structure 100 extends circumferentially around the insertion protrusion 221.
[0044] The shape of the finger structure 100 matches the shape of the insertion protrusion 221; for example, if the insertion protrusion 221 is a cylindrical structure, the finger structure 100 is a corresponding annular structure; if the insertion protrusion 221 is a square column structure, the finger structure 100 is a corresponding square ring structure. The finger structure 100 can be a closed annular structure or a non-closed structure; for example, if the insertion protrusion 221 is a cylindrical or square column structure, the finger structure 100 is a corresponding closed annular or square ring structure; if the insertion protrusion 221 is a thin plate structure, the finger structure 100 extends continuously on one side of the large surface of the thin plate structure and abuts against the large surface, and breaks off on the side of the thin plate structure.
[0045] This configuration allows for a reliable conductive connection between the insertion protrusion 221 and the inner wall of the conductive groove 212.
[0046] In some embodiments of this application, the finger piece 120 is perpendicular to the body 110, that is, it extends along the second direction Z; in other embodiments, the finger piece 120 and the body 110 may also be inclined.
[0047] like Figure 3 , Figure 4 and Figure 7As shown, in some embodiments of this application, a plurality of first finger pieces 121 and a plurality of second finger pieces 122 are respectively formed on both sides of the body 110. The plurality of first finger pieces 121 are spaced apart along the extension direction of the finger structure 100, and the plurality of second finger pieces 122 are spaced apart along the extension direction of the finger structure 100.
[0048] For ease of description, in the unfolded state, the body 110 extends along the first direction X in its length direction and along the second direction Z in its width direction; in the finished or assembled state, the length direction of the body 110 is the extension direction of the finger structure 100, such as the circumferential direction of a ring structure. First finger pieces 121 and second finger pieces 122 are formed on both sides of the body 110 along the second direction Z, respectively. Multiple first finger pieces 121 are spaced apart along the first direction X, and multiple second finger pieces 122 are spaced apart along the first direction X.
[0049] This configuration increases the conductive contact area of the finger pieces. The first finger piece 121 and the second finger piece 122 are conductively connected to the body 110 from opposite sides of the body 110, respectively. With the same conductive contact area, the conductive path is shortened, the contact resistance is reduced, and the conductivity of the finger structure 100 is improved.
[0050] In some embodiments of this application, the first contact piece 121 and the second contact piece 122 have the same structure and the same arrangement parameters to simplify the construction of the contact structure 100; in other embodiments, the structure and arrangement parameters of the first contact piece 121 and the second contact piece 122 can also be set independently to achieve a roughly uniform change in the flow area.
[0051] In some embodiments of this application, the first finger piece 121 and the second finger piece 122 are alternately arranged along the extending direction of the finger structure 100.
[0052] like Figure 7 , Figure 8 and Figure 9 As shown, in the unfolded state, the extension direction of the finger structure 100 is the first direction X. The first finger piece 121 has a starting point a1 and an ending point a2 along the first direction X, and the second finger piece 122 has a starting point b1 and an ending point b2 along the first direction X. The staggered arrangement of the first finger piece 121 and the second finger piece 122 means that the projection areas of the starting point a1 and the ending point a2 in the first direction X do not completely overlap with the projection areas of the starting point b1 and the ending point b2 in the first direction X, that is, there is at least a partially overlapping area.
[0053] With this arrangement, the first contact finger 121 and the second contact finger 122 are connected to the body 110 in an alternating manner, thereby achieving a balanced conductive connection between each contact finger and the body 110 and improving conductivity.
[0054] In other embodiments, the first finger piece 121 and the second finger piece 122 may also be aligned.
[0055] Along the extension direction of the finger structure 100, the distance between two adjacent first finger pieces 121 is W, and the misalignment distance between the first finger piece 121 and the second finger piece 122 is e.
[0056] The distance W between two adjacent first finger pieces 121 refers to the distance between the starting points b1 of the two adjacent first finger pieces 121 in the first direction X; the misalignment distance e between the first finger piece 121 and the second finger piece 122 refers to the distance between the starting point a1 of a first finger piece 121 and the starting point b1 of the adjacent second finger piece 122 in the first direction X.
[0057] In some embodiments of this application, 0.2W ≤ e ≤ 0.8W.
[0058] By limiting the above parameters to the above range, the degree of interleaving of the multiple first contact pieces 121 and the multiple second contact pieces 122 can be kept within a suitable range, resulting in better structural strength and electrical conductivity.
[0059] As a preferred embodiment, e = 0.5W not only has a regular structure and is easy to manufacture, but also has good structural strength and electrical conductivity.
[0060] like Figure 3 As shown, in some embodiments of this application, the groove depth of the conductive groove 212 is F, where 1mm≤F≤8mm.
[0061] By limiting the above parameters to the above range, sufficient conductive area can be provided on the inner sidewall of the conductive groove 212 to make conductive connection with the finger structure 100, and the insertion protrusion 221 and the conductive groove 212 are easy to insert and remove.
[0062] Preferably, 3mm≤F≤6mm not only provides sufficient conductive area, allowing the conductive groove 212 to be reliably conductively connected to the insertion protrusion 221 through the finger structure 100, but also ensures that the insertion protrusion 221 can be firmly inserted into the conductive groove 212 without easily loosening, while allowing a certain amount of external force to be applied to remove it from the conductive groove 212.
[0063] like Figure 3As shown, the finger structure 100 includes a first side 111 and a second side 112 in the thickness direction. The body 110 includes a first conductive surface 113 on the first side 111, and the finger piece 120 includes a second conductive surface 123 on the second side 112. The finger structure 100 has an uncompressed state and a compressed state between the conductive groove 212 and the insertion protrusion 221. When the finger structure 100 is in the uncompressed state, the distance between the first conductive surface 113 and the second conductive surface 123 is C (please refer to...). Figure 8 When the finger structure 100 is in a compressed state, the distance between the first conductive surface 113 and the second conductive surface 123 is D.
[0064] In some embodiments of this application, the first conductive surface 113 and the second conductive surface 123 are arranged in parallel; in other embodiments, the first conductive surface 113 and the second conductive surface 123 may also have an angle between them, and the distance between the first conductive surface 113 and the second conductive surface 123 is the minimum distance between the two conductive surfaces.
[0065] In some embodiments of this application, 0.3C≤D≤0.7C, the finger structure 100 is not easily broken under compression, and both the first conductive surface 113 and the second conductive surface 123 have sufficient contact pressure, so as to reliably conduct electricity to the conductive groove 212 and the plug protrusion 221.
[0066] In some embodiments of this application, 0.1≤C≤1.6mm, which is easy to manufacture and mold, and the finger structure 100 has sufficient structural strength and is not easy to break under compression.
[0067] like Figure 7 , Figure 8 and Figure 9 As shown, along the extension direction of the finger structure 100, the width of the finger piece 120 is A, the gap between two adjacent finger pieces 120 is B, and along the groove depth direction of the conductive groove 212, the size of the body 110 is W1, and the size of the finger structure 100 is W.
[0068] For ease of description, in the unfolded state, the length of the finger structure 100 extends along the first direction X, and the width extends along the second direction Z. Taking the first finger piece 121 as an example, the first finger piece 121 has a starting point a1 and an ending point a2. The width A of the first finger piece 121 refers to the distance between the starting point a1 and the ending point a2 in the first direction X; the gap B between two adjacent first finger pieces 121 refers to the distance between the starting points a1 of two adjacent first finger pieces 121 in the first direction X. The groove depth of the conductive groove 212 extends along the second direction Z, and the dimensions W1 of the body 110 and the dimensions W of the finger structure 100 both refer to their dimensions in the second direction Z.
[0069] In some embodiments of this application, 0.5 ≤ A ≤ 1 mm.
[0070] By limiting the above parameters within the above range, the contact finger piece 120 has a suitable width range, which can ensure that the contact finger structure 100 has sufficient structural strength and that the contact finger piece 120 is firmly connected to the body 110, and also ensure that the number of contact finger pieces 120 is sufficient, thereby providing more conductive contact points and reducing contact resistance.
[0071] In some embodiments of this application, 0.1mm ≤ B ≤ 0.4mm.
[0072] By limiting the above parameters within the above range, a suitable arrangement gap is made between two adjacent contact pieces 120. This ensures that the width of each contact piece 120 is within a suitable range, guaranteeing that the contact structure 100 has sufficient structural strength, and also ensures that the number of contact pieces 120 is sufficient, thereby providing a larger number of conductive contact points and reducing contact resistance.
[0073] In some embodiments of this application, 0.2 ≤ W1 / W ≤ 0.44.
[0074] By limiting the above parameters within the above range, the ratio of the contact finger 120 to the body 110 in the second direction Z is in a suitable range, which can ensure sufficient conductive contact area and shorten the conductive path, thereby reducing contact resistance.
[0075] like Figure 10 As shown, in some embodiments of this application, there are two bodies 110, which are spaced apart along the groove depth direction of the conductive groove 212, and are connected by a plurality of contact fingers 120.
[0076] Two bodies 110 are spaced apart along the second direction Z, and a finger piece 120 extends along the second direction Z. The two ends of the finger piece 120 are respectively connected to the edges of the two bodies 110. The two bodies 110 may have the same or different dimensions in the second direction Z.
[0077] This configuration increases the conductive contact area of the body 110 and allows it to fully contact the conductive groove 212 or the insertion protrusion 221 under compressed conditions, thereby improving conductivity.
[0078] In other embodiments, the number of bodies 110 may also be one, three, four, etc.
[0079] Some embodiments of this application include an electrical device that includes a battery 200, which provides electrical energy to the electrical device.
[0080] Due to the aforementioned characteristics of the battery 200 in this application embodiment, the electrical device in this application embodiment also has good safety performance and reliability.
[0081] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.
[0082] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A battery (200), characterized in that, include: The battery cell (210) includes a terminal post (211), the terminal post (211) including a conductive groove (212). Busbar (220) includes plug-in protrusion (221); The finger structure (100) includes a body (110) and finger pieces (120). The edge of the body (110) extends to form a plurality of finger pieces (120). The finger structure (100) is disposed inside the conductive groove (212). The insertion protrusion (221) is inserted into the finger structure (100). The insertion protrusion (221) is electrically connected to the conductive groove (212) through the finger structure (100). One of the body (110) and the finger piece (120) abuts against the conductive groove (212), and the other abuts against the insertion protrusion (221).
2. The battery (200) according to claim 1, characterized in that, The two sides of the body (110) extend to form a plurality of first finger pieces (121) and a plurality of second finger pieces (122), respectively. The plurality of first finger pieces (121) are spaced apart along the extension direction of the finger structure (100), and the plurality of second finger pieces (122) are spaced apart along the extension direction of the finger structure (100).
3. The battery (200) according to claim 2, characterized in that, Along the extending direction of the finger structure (100), the first finger piece (121) and the second finger piece (122) are arranged alternately.
4. The battery (200) according to claim 3, characterized in that, Along the extending direction of the finger structure (100), the distance between two adjacent first finger pieces (121) is W, and the misalignment distance between the first finger piece and the second finger piece (122) is e, satisfying: 0.2W≤e≤0.8W.
5. The battery (200) according to claim 4, characterized in that, e=0.5W.
6. The battery (200) according to claim 1, characterized in that, Two bodies (110) are provided, and the two bodies (110) are spaced apart along the groove depth direction of the conductive groove (212). The two bodies (110) are connected by a plurality of finger pieces (120).
7. The battery (200) according to claim 1, characterized in that, The finger structure (100) extends circumferentially around the insertion protrusion (221).
8. The battery (200) according to claim 1, characterized in that, Along the extending direction of the finger structure (100), the width of the finger piece (120) is A, the gap between two adjacent finger pieces (120) is B, and along the groove depth direction of the conductive groove (212), the size of the body (110) is W1, and the size of the finger structure (100) is W, satisfying: 0.5≤A≤1mm; and / or 0.1mm≤B≤0.4mm; and / or 0.2≤W1 / W≤0.
44.
9. The battery (200) according to claim 1, characterized in that, The depth of the conductive groove (212) is F, satisfying: 1mm≤F≤8mm.
10. The battery (200) according to claim 9, characterized in that, 3mm≤F≤6mm.
11. The battery (200) according to claim 1, characterized in that, The finger structure (100) includes a first side (111) and a second side (112) in the thickness direction. The body (110) includes a first conductive surface (113) on the first side (111), and the finger piece (120) includes a second conductive surface (123) on the second side (112). The finger structure (100) has an uncompressed state and a compressed state inserted between the conductive groove (212) and the insertion protrusion (221). When the finger structure (100) is in the uncompressed state, the distance between the first conductive surface (113) and the second conductive surface (123) is C. When the finger structure (100) is in the compressed state, the distance between the first conductive surface (113) and the second conductive surface (123) is D, satisfying: 0.1≤C≤1.6mm; and / or 0.3C≤D≤0.7C.
12. An electrical appliance, characterized in that, Includes a battery (200) as described in any one of claims 1 to 11, the battery (200) being used to provide electrical energy to the electrical device.