Battery and electric device
By using a composite terminal structure in the battery, the problem of unstable temperature during thermal bonding between the casing and the terminal is solved, resulting in a more stable packaging effect, a simplified production process, and reduced costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU LIWINON NEW ENERGY TECH CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-14
Smart Images
Figure CN224502272U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery and electrical equipment. Background Technology
[0002] The battery structure consists of three parts: a cover plate, a cell, and a casing. The positive electrode structure can be located on the cover plate or the casing. Cells are divided into stacked and wound types. The casing is generally made of stainless steel. The terminals are generally joined by riveting or composite bonding. Currently, the commonly used structure has the following defects: when the composite terminals are fused to the side of the battery, because the casing is made of metal, its own heat transfer is relatively fast, resulting in unstable temperature at the thermal bonding position, which makes the terminal bonding process difficult and the thermal bonding of the casing poor. Utility Model Content
[0003] The purpose of this utility model is to provide a battery and electrical device to solve the technical problem in the prior art where unstable temperature during thermal bonding of the casing and the terminal post leads to difficulties in the terminal post bonding process and poor encapsulation effect of thermal bonding of the casing.
[0004] To achieve the above objectives, the first aspect of this utility model provides a battery comprising: a composite terminal post and a housing; the composite terminal post includes a terminal post connector, a composite material layer, and a connecting steel sheet; the terminal post connector includes a connecting plate and a connecting boss; the connecting boss is disposed on one side of the connecting plate, the composite material layer has a first through hole for the connecting boss to pass through; the connecting steel sheet has a second through hole for the connecting boss to pass through; the connecting plate, the composite material layer, and the connecting steel sheet are stacked sequentially, and the connecting boss passes through the first through hole and the second through hole; the housing has a third through hole, the connecting boss passes through the third through hole, and the connecting steel sheet is connected to the outer side of the housing.
[0005] Preferably, the housing includes a cover plate and a bottom shell having a receiving cavity; the cover plate is connected to the bottom shell and covers the receiving cavity;
[0006] The third through hole is provided on the cover plate, and the connecting steel sheet is connected to the cover plate;
[0007] Alternatively, the third through hole is provided on the bottom shell; the connecting steel sheet is connected to the bottom shell.
[0008] Preferably, the housing includes a first cover plate, a second cover plate, and a frame, the frame having a first opening and a second opening, the first cover plate covering the first opening, and the second cover plate covering the second opening;
[0009] The third through hole is provided on the frame, and the connecting steel plate is connected to the frame;
[0010] Alternatively, the third through hole is disposed on the first cover plate or the second cover plate, and the connecting steel sheet is connected to the first cover plate or the second cover plate.
[0011] Preferably, there is a first reserved gap between the wall of the first through hole and the connecting boss, a second reserved gap between the wall of the second through hole and the connecting boss, and a third reserved gap between the wall of the third through hole and the connecting boss.
[0012] Preferably, it further includes: an insulating component; the insulating component is located inside the housing, one side of the insulating component facing the connecting steel sheet is in contact with the housing, the insulating component is provided with a fourth through hole, and the connecting boss penetrates the fourth through hole.
[0013] Preferably, there is a fourth reserved gap between the wall of the fourth through hole and the connecting boss.
[0014] Preferably, the end of the connecting boss away from the connecting plate is end face A, and the side of the insulating member away from the housing is end face B, with the dimension between end face A and end face B being greater than 0.03 mm.
[0015] Preferably, it further includes a first straight line, which passes through the axis of the connecting boss and is parallel to the connecting plate. The projection of the composite material layer on the housing is C, and the projection of the connecting steel sheet on the housing is D. The projection of the first straight line on the housing and the outer edge of C have a first intersection point M, and the projection of the first straight line on the housing and the outer edge of D have a second intersection point N. The distance between the intersection point M and the intersection point N is L, which satisfies 0.2mm≤L≤1.5mm.
[0016] Preferably, there is a fifth reserved gap between the edge of the connecting steel sheet and the edge of the housing.
[0017] Preferably, the outer edges of the connecting plate, the composite material layer, and the connecting steel sheet are all circular; the connecting boss is cylindrical.
[0018] The second aspect of this utility model provides an electrical device that includes a battery as described above.
[0019] The battery and electrical equipment provided by this utility model have the following advantages: the composite terminal of the battery is thermally bonded after being stacked in sequence by connecting plate, composite material layer and connecting steel sheet to form an independent composite terminal. Therefore, it is not necessary to bond the composite terminal to the shell. Thus, the shell does not need to be surface treated. Only the connecting plate and connecting steel sheet need to be passivated and cleaned to reduce the surface treatment cost. Moreover, since the shell does not participate in the thermal bonding, the shell is prevented from transferring heat during the thermal bonding process. This makes the temperature of the connecting steel sheet and connecting plate more stable during the thermal bonding process, improves the encapsulation effect of the composite terminal and enhances the sealing stability.
[0020] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of the battery in this embodiment of the present invention when the composite electrode post is square;
[0022] Figure 2 This is an exploded structural diagram of the battery according to an embodiment of the present invention;
[0023] Figure 3 This is a schematic diagram of the structure of the composite pole in a square shape according to an embodiment of the present invention;
[0024] Figure 4 yes Figure 3 A schematic diagram of the exploded structure of the composite pole;
[0025] Figure 5 yes Figure 1 A partial cross-sectional view of the battery;
[0026] Figure 6 yes Figure 3 A schematic diagram of the projection of the composite pole onto the housing;
[0027] Figure 7 This is a schematic diagram of the cover plate with a third through hole according to an embodiment of the present utility model;
[0028] Figure 8 This is a schematic diagram of the structure of the battery in this embodiment of the present invention when the composite electrode post is circular;
[0029] Figure 9 yes Figure 8 A schematic diagram of the exploded structure of the composite pole;
[0030] Figure 10 This is a structural schematic diagram of the first cover plate, the second cover plate, and the frame in an embodiment of this utility model.
[0031] In the diagram, 100 is the composite pole; 110 is the pole connector; 111 is the connecting plate; 112 is the connecting boss; 120 is the composite material layer; 121 is the first through hole; 130 is the connecting steel sheet; 131 is the second through hole; 200 is the shell; 210 is the third through hole; 220 is the cover plate; 230 is the bottom shell; 231 is the bottom plate; 232 is the square side frame; 240 is the first cover plate; 250 is the second cover plate; 260 is the frame; 300 is the insulating component; and 310 is the fourth through hole. Detailed Implementation
[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0033] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0034] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.
[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0036] Please refer to the following: Figures 1 to 9 The battery provided in the embodiments of this utility model will now be described.
[0037] like Figures 1 to 4As shown, the battery of this utility model embodiment includes: a composite terminal 100 and a housing 200; the composite terminal 100 includes a terminal connector 110, a composite material layer 120, and a connecting steel sheet 130; the terminal connector 110 includes a connecting plate 111 and a connecting boss 112; the connecting boss 112 is disposed on one side of the connecting plate 111, the composite material layer 120 is provided with a first through hole 121 for the connecting boss 112 to pass through; the connecting steel sheet 130 is provided with a second through hole 131 for the connecting boss 112 to pass through; the connecting plate 111, the composite material layer 120, and the connecting steel sheet 130 are stacked in sequence, and the connecting boss 112 passes through the first through hole 121 and the second through hole 131; the housing 200 is provided with a third through hole 210; the connecting boss 112 passes through the third through hole 210, and the connecting steel sheet 130 is connected to the outer side of the housing 200. In this embodiment, the connecting steel sheet 130 is directly welded to the housing 200 to achieve the connection between the connecting steel sheet 130 and the housing 200. Alternatively, the connecting steel sheet 130 can be bonded to the housing 200 with adhesive to achieve the connection between the connecting steel sheet and the housing 200.
[0038] The electrode connector 110 can be made of aluminum alloy. The connecting steel sheet 130 can be made of stainless steel. During the fabrication of the composite electrode 100, the connecting plate 111, the composite material layer 120, and the connecting steel sheet 130 are stacked sequentially so that the connecting boss 112 passes through the first through hole 121 and the second through hole 131. Then, thermal bonding is performed to support the independent composite electrode 100. The composite electrode 100 can be welded to the housing 200 via the connecting steel sheet 130, allowing the composite electrode 100 to be installed on the housing 200.
[0039] It should be noted that the connecting boss 112 needs to pass through the first through hole 121, the second through hole 131, and the third through hole 210 so that the connecting boss 112 can be connected to the battery cell inside the housing 200.
[0040] In this embodiment, the composite terminal 100 of the battery is formed by thermal bonding after the connecting plate 111, the composite material layer 120, and the connecting steel sheet 130 are stacked in sequence to form an independent composite terminal 100. Therefore, it is not necessary to bond the composite terminal 100 to the housing 200. Thus, the housing 200 does not need to undergo surface treatment. Only the connecting plate 111 and the connecting steel sheet 130 need to be passivated and cleaned to reduce surface treatment costs. Moreover, since the housing 200 does not participate in thermal bonding, the heat during thermal bonding is prevented from being transferred away by the housing 200, making the temperature of the connecting steel sheet 130 and the connecting plate 111 more stable during thermal bonding, improving the encapsulation effect of the composite terminal 100 and enhancing the sealing stability.
[0041] Understandably, since the casing 200 does not participate in thermal bonding, the interference at the bottom of the casing 200 will not cause difficulties in the bonding and encapsulation of the electrode post, thus reducing the manufacturing difficulty of the electrode post bonding and facilitating automated production. Moreover, batteries of different sizes can use composite electrode posts 100 of the same specification, reducing the need to remake fixtures and change production lines when the casing 200 is directly bonded to the electrode post, thus saving costs.
[0042] It should be noted that the composite electrode 100 can be bonded to the electrode connector 110 and the connecting steel sheet 130 by a composite material layer 120 such as PP (polypropylene) adhesive, polyester hot melt adhesive, polyolefin hot melt adhesive, or EVA (ethylene-vinyl acetate copolymer) hot melt adhesive. When the battery fails due to thermal failure, the adhesive force of the composite material layer 120 decreases, and the internal air pressure can push open the electrode connector 110 to release the gas inside the casing 200 and achieve the purpose of depressurization.
[0043] In some embodiments of this utility model, reference is made to Figure 2 The housing 200 includes a cover plate 220 and a bottom shell 230 having a receiving cavity; the cover plate 220 is connected to the bottom shell 230, and the cover plate 220 seals the receiving cavity; the cover plate 220 can be welded to the bottom shell to seal the entire receiving cavity and ensure a tight seal. In this embodiment, as... Figure 2 As shown, the housing 200 is square. However, in some other embodiments, the housing 200 may be circular or other shapes.
[0044] The composite pole 100 can be installed on the cover plate 220 or the bottom shell 230; the following will explain the two cases.
[0045] The first case, such as Figure 7 As shown, the composite electrode 100 is disposed on the cover plate 220, the third through hole 210 is disposed on the cover plate 220, and the connecting steel sheet 130 is welded to the cover plate 220. This arrangement allows the housing 200 to be compatible with thinner battery cells, such as those less than 3 mm thick. It also allows for greater assembly space on the sides of the battery cells, reducing the precision requirements of the equipment.
[0046] The second scenario, such as Figure 1 , 2 As shown, the composite pole 100 is disposed on the base shell 230, and the third through hole 210 is disposed on the base shell 230; the connecting steel sheet 130 is welded to the base shell 230. The base shell 230 includes a base plate 231 and a square side frame 232; the base plate 231 and the square side frame 232 are connected to form a square base shell 230. That is, the composite pole 100 can be disposed on the base plate 231 and the square side frame 232. It is understood that the corners of the square side frame 232 can be rounded for a smooth transition.
[0047] like Figure 1 As shown, the composite pole 100 is disposed on the square side frame 232, the third through hole 210 is disposed on the square side frame 232, and the connecting steel sheet 130 is welded to the square side frame 232.
[0048] In addition, in some other embodiments, the composite pole 100 is disposed on the base plate 231 (not shown in the figure), the third through hole 210 is disposed on the base plate 231, and the connecting steel sheet 130 is welded to the base plate 231. This allows the housing 200 to be compatible with thinner battery cells, such as those less than 3 mm thick. Furthermore, it allows for greater assembly space on the sides of the battery cells, reducing the precision requirements of the equipment.
[0049] In some embodiments of this utility model, reference is made to Figure 10 The housing 200 includes a first cover plate 240, a second cover plate 250, and a frame 260. The frame 260 has a first opening and a second opening. The first cover plate 240 covers the first opening, and the second cover plate 250 covers the second opening. The first opening and the second opening are located on opposite sides of the frame 260, so that after the first cover plate 240 covers the first opening and the second cover plate 250 covers the second opening, the frame 260, together with the first cover plate 240 and the second cover plate 250, forms a closed battery housing to protect the internal battery cells. That is, the housing 200 adopts a mid-frame structure. Compared to a stamped housing, the first cover plate 240 and the second cover plate 250 are connected and formed, so that there are no rounded corners between the frame 260 and the edges of the first cover plate 240 and the second cover plate 250, resulting in a larger internal space for the housing 200 to accommodate more electrolyte.
[0050] The composite pole 100 can be disposed on one of the first cover plate 240, the second cover plate 250, or the frame 260; the following two cases will be described.
[0051] The first scenario, refer to... Figure 10 The composite electrode post 100 is disposed on the frame 260, that is, the corresponding third through hole 210 is disposed on the frame 260. The connecting steel sheet 130 is connected to the frame 260. During battery assembly, thermal deformation can be avoided when the frame 260 is directly thermally bonded to the composite electrode post 100.
[0052] In the second scenario, the composite electrode 100 is disposed on the first cover plate 240 or the second cover plate 250, and the third through hole 210 is disposed on the first cover plate 240 or the second cover plate 250 (not shown in the figure). The connecting steel sheet 130 is connected to the first cover plate 240 or the second cover plate 250. The first cover plate 240 and the second cover plate 250 are symmetrically arranged, and the appropriate first cover plate 240 or second cover plate 250 can be selected to connect the composite electrode 100 according to the electrode tab distribution of the battery cell. By disposing of the composite electrode 100 on the first cover plate 240 or the second cover plate 250, the housing 200 can be compatible with thinner battery cells, such as those less than 3 mm thick, and the sides of the battery cell can have more assembly space, reducing the precision requirements of the equipment.
[0053] In some embodiments of this utility model, reference is made to Figure 4 and Figure 5 The first through hole 121 has a first reserved gap a between its wall and the connecting boss 112, the second through hole 131 has a second reserved gap b between its wall and the connecting boss 112, and the third through hole 210 has a third reserved gap c between its wall and the connecting boss 112. This ensures that the connecting steel sheet 130, the composite material layer 120, and the shell 200 do not contact the connecting boss 112, thus preventing leakage. Furthermore, it allows the gas from the battery during thermal failure to push against the terminal connector 110 for gas discharge.
[0054] In some embodiments of this utility model, reference is made to Figure 2 and Figure 5 It also includes: an insulating component 300; the insulating component 300 is located inside the housing 200, and one side of the insulating component 300 facing the connecting steel plate 130 contacts the housing 200; the insulating component 300 is provided with a fourth through hole 310. The connecting boss 112 passes through the fourth through hole 310; the insulating component 300 allows the battery cell to be connected to the outside only through the connecting boss 112, ensuring electrical safety.
[0055] In some embodiments of this utility model, reference is made to Figure 5 The fourth through hole 310 has a fourth reserved gap d between its wall and the connecting boss 112. This fourth reserved gap allows gas generated during battery thermal failure to push against the terminal connector 110 for gas discharge.
[0056] In some embodiments of this utility model, reference is made to Figure 5 The side of the connecting boss 112 away from the connecting plate 111 is end face A, and the side of the insulating component 300 away from the housing 200 is end face B. The dimension f between end face A and end face B is greater than 0.03 mm to ensure effective welding of the connecting boss 112 to the electrode tab of the battery cell.
[0057] In some embodiments of this utility model, reference is made to Figure 6 It also includes a first straight line H, which passes through the axis of the connecting boss 112 and is parallel to the connecting plate 111. The projection of the composite material layer 120 along the axis of the connecting boss 112 onto the housing 200 is C. The projection of the connecting steel sheet 130 along the axis of the connecting boss 112 onto the housing 200 is D. The projection of the first straight line H along the axis of the connecting boss 112 onto the housing 200 has a first intersection point M with the outer edge of C. The projection of the first straight line H along the axis of the connecting boss 112 onto the housing 200 has a second intersection point N with the outer edge of D. The distance between the intersection point M and the intersection point N is L, which satisfies 0.2mm≤L≤1.5mm; that is, L is the distance between the edge of the connecting steel sheet 130 and the edge of the composite material layer 120.
[0058] To ensure effective welding between the connecting steel plate 130 and the housing 200, the edge distance L between the connecting steel plate 130 and the composite material layer 120 shall be ≥0.2mm. To ensure effective sealing between the pole connector 110 and the connecting steel plate 130, the distance L between the connecting steel plate 130 and the composite material layer 120 shall be ≤1.5mm.
[0059] In some embodiments of this utility model, reference is made to Figure 5 To ensure that the composite pole 100 and the housing 200 do not interfere with each other during assembly, a fifth reserved gap e is provided between the edge of the connecting steel plate 130 and the edge of the housing 200. This allows the connecting boss 112 of the composite pole 100 to be better aligned with the third through hole 210, facilitating positioning.
[0060] In some embodiments of this utility model, the outer edges of the connecting plate 111, the composite material layer 120, and the connecting steel sheet 130 are all square, such as... Figures 1 to 5 As shown.
[0061] In some specific embodiments, reference is made to Figure 8 and Figure 9 The outer edges of the connecting plate 111, the composite material layer 120, and the connecting steel sheet 130 are all circular; the connecting boss 112 is cylindrical. Compared with the square one, the circular composite pole 100 has a fully symmetrical structure, which eliminates the need to control the assembly angle of the composite pole 100, and facilitates the assembly of the pole connector 110, the composite material layer 120, and the connecting steel sheet 130, as well as the assembly of the composite pole 100 with the housing 200.
[0062] This embodiment also provides an electrical device, which includes the battery as described above. The electrical device uses the battery described above. The composite terminal 100 of the battery is thermally bonded after being sequentially stacked by a connecting plate 111, a composite material layer 120, and a connecting steel sheet 130 to form an independent composite terminal 100. Therefore, it is unnecessary to bond the composite terminal 100 to the housing 200. Thus, surface treatment of the housing 200 is not required; only passivation and cleaning treatment of the connecting plate 111 and the connecting steel sheet 130 is needed to reduce surface treatment costs. Furthermore, since the housing 200 does not participate in the thermal bonding, the heat generated during thermal bonding is prevented from being dissipated, allowing the temperature of the connecting steel sheet 130 and the connecting plate 111 to be more stable during thermal bonding, improving the encapsulation effect of the composite terminal 100 and enhancing sealing stability.
[0063] In summary, in this embodiment, the composite terminal 100 of the battery is formed by thermal bonding after the connecting plate 111, the composite material layer 120, and the connecting steel sheet 130 are stacked sequentially. This eliminates the need for bonding the composite terminal 100 to the housing 200, thus eliminating the need for surface treatment of the housing 200. Only the connecting plate 111 and the connecting steel sheet 130 require passivation and cleaning, reducing surface treatment costs. Furthermore, since the housing 200 does not participate in the thermal bonding process, it prevents the heat from being dissipated during thermal bonding, resulting in more stable temperatures for the connecting steel sheet 130 and the connecting plate 111 during thermal bonding. This improves the encapsulation effect of the composite terminal 100 and enhances its sealing stability.
[0064] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.
Claims
1. A battery, characterized in that, include: A composite electrode post and a housing; the composite electrode post includes an electrode post connector, a composite material layer, and a connecting steel plate; the electrode post connector includes a connecting plate and a connecting boss; the connecting boss is disposed on one side of the connecting plate, and the composite material layer has a first through hole for the connecting boss to pass through; the connecting steel plate has a second through hole for the connecting boss to pass through; the connecting plate, the composite material layer, and the connecting steel plate are stacked sequentially, and the connecting boss passes through the first through hole and the second through hole; the housing has a third through hole, the connecting boss passes through the third through hole, and the connecting steel plate is connected to the outer side of the housing.
2. The battery according to claim 1, characterized in that, The housing includes a cover plate and a bottom shell having a receiving cavity; the cover plate is connected to the bottom shell and covers the receiving cavity; The third through hole is provided on the cover plate, and the connecting steel sheet is connected to the cover plate; Alternatively, the third through hole is provided on the bottom shell; the connecting steel sheet is connected to the bottom shell.
3. The battery according to claim 1, characterized in that, The housing includes a first cover plate, a second cover plate, and a frame. The frame has a first opening and a second opening. The first cover plate covers the first opening, and the second cover plate covers the second opening. The third through hole is provided on the frame, and the connecting steel plate is connected to the frame; Alternatively, the third through hole is disposed on the first cover plate or the second cover plate, and the connecting steel sheet is connected to the first cover plate or the second cover plate.
4. The battery according to claim 1, characterized in that, The first through hole has a first reserved gap between its wall and the connecting boss, the second through hole has a second reserved gap between its wall and the connecting boss, and the third through hole has a third reserved gap between its wall and the connecting boss.
5. The battery according to any one of claims 1-4, characterized in that, Also includes: Insulating components; The insulating component is located inside the housing, and one side of the insulating component facing the connecting steel sheet contacts the housing. The insulating component is provided with a fourth through hole, and the connecting boss penetrates the fourth through hole.
6. The battery according to claim 5, characterized in that, There is a fourth reserved gap between the wall of the fourth through hole and the connecting boss.
7. The battery according to claim 6, characterized in that, The end of the connecting boss away from the connecting plate is end face A, and the side of the insulating member away from the housing is end face B. The dimension between end face A and end face B is greater than 0.03 mm.
8. The battery according to claim 1, characterized in that, It also includes a first straight line, which passes through the axis of the connecting boss and is parallel to the connecting plate. The projection of the composite material layer on the shell is C, and the projection of the connecting steel sheet on the shell is D. The projection of the first straight line on the shell and the outer edge of C have a first intersection point M, and the projection of the first straight line on the shell and the outer edge of D have a second intersection point N. The distance between the intersection point M and the intersection point N is L, which satisfies 0.2mm≤L≤1.5mm.
9. The battery according to claim 1, characterized in that, There is a fifth reserved gap between the edge of the connecting steel sheet and the edge of the shell.
10. The battery according to claim 1, characterized in that, The outer edges of the connecting plate, the composite material layer, and the connecting steel sheet are all circular; the connecting boss is cylindrical.
11. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1-10.