Top cover structure and battery

Abstract

The utility model provides a top cover structure and a battery, and the top cover structure comprises a cover plate which is made of a conductive material; the first pole is positioned on the first surface of the cover plate and is fixedly connected with the cover plate; the second pole penetrates through the first surface and the second surface of the cover plate and is insulated from the cover plate; the connecting block is located on the second surface of the cover plate and fixedly connected with the cover plate; and the connecting block is used for being connected with a first tab of a battery cell. According to the technical scheme, the number of independent components needing to be arranged is reduced, the production and assembly procedures of the components are simplified, and the working efficiency is improved; meanwhile, the number of the independent components is reduced, the quality of each component is more convenient to control, and the quality of the battery formed by subsequent assembly is convenient to control; moreover, the resistance of a transmission path is reduced, the internal resistance of the battery is reduced after the battery is assembled, and the working efficiency of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a top cover structure and a battery. Background Art

[0002] In the existing battery structure, the pole is passed through the cover plate and maintains an insulated connection with the cover plate; a connecting piece is provided between the pole and the battery cell, and the electrical connection between the pole and the lug of the battery cell is achieved through the provided connecting piece.

[0003] In the existing battery structure, there are many independent components, which leads to more production and assembly processes and makes the overall quality control of the battery more difficult. The conductive components among the multiple independent components are connected (such as welding) to realize the transmission path of the battery cell tab-connecting plate-electrode. The battery itself is affected by the large resistance at the connection positions of different components, which makes the internal resistance of the battery itself large, and also causes the problem of low battery efficiency. Utility Model Content

[0004] The present application provides a top cover structure and a battery, which simplifies the battery structure, simplifies the production and assembly processes of battery components, and facilitates the control of battery quality; reduces the internal resistance of the battery itself, and improves the working efficiency of the battery.

[0005] In a first aspect, the present application provides a top cover structure, comprising:

[0006] A cover plate, wherein the cover plate is made of a conductive material;

[0007] A first pole, located on the first surface of the cover plate and fixedly connected to the cover plate;

[0008] A second pole, passing through the first surface and the second surface of the cover plate and insulated from the cover plate;

[0009] A connecting block, located on the second surface of the cover plate and fixedly connected to the cover plate;

[0010] The connecting block is used to connect with the first pole lug of the battery cell;

[0011] The first surface and the second surface are two surfaces facing away from each other in the thickness direction of the cover plate, and the second surface is a side of the cover plate facing the battery cell.

[0012] In the above technical solution, by setting the first pole and the connecting block, the number of independent components that need to be set is reduced, the production and assembly processes of the components are simplified, and the work efficiency is improved; at the same time, the reduction in the number of independent components also makes it more convenient to control the quality of each component, and facilitates the quality control of the subsequent assembly to form a battery; and, by directly connecting the connecting block with the first pole ear, compared with the existing method of connecting the pole and the pole ear with a connecting sheet, the resistance of the transmission path is reduced. After being assembled into a battery, the internal resistance of the battery itself is reduced, thereby improving the working efficiency of the battery.

[0013] In a specific implementation manner, the first pole is a positive pole, and the cover plate is made of aluminum or an aluminum alloy.

[0014] In the above technical solution, the positive electrode column and the cover plate are integrally formed, and the cover plate is made of aluminum or aluminum alloy, which reduces the number of independent components and the internal resistance of the battery while maintaining a low cost.

[0015] In a specific embodiment, the first pole is a negative pole, and the cover plate is made of copper or a copper alloy.

[0016] In the above technical solution, the cover plate is made of copper or copper alloy, which has a lower resistivity and a higher current transmission efficiency than aluminum and aluminum alloy.

[0017] In a specific possible implementation manner, the first pole and the connecting block are integrally formed with the cover plate.

[0018] In the above technical solution, the first pole and the connecting block are integrally formed with the cover plate, which simplifies the subsequent assembly process compared to welding and other methods. In addition, the integrally formed method can minimize the resistance of the current in the transmission path of the connecting block-cover plate-first pole, reduce the loss of the battery itself, and improve the working efficiency of the battery.

[0019] In a specific possible implementation manner, a plastic plate is further included, wherein the plastic plate is attached to the second surface of the cover plate, and an avoidance hole is opened on the plastic plate for the second pole and the connection block to pass through.

[0020] In the above technical solution, the plastic plate is set to separate the cover plate and the battery cell, which plays a certain buffering role and absorbs the external impact on the cover plate; it plays the role of insulating and isolating the cover plate and the battery cell, avoiding the risk of short circuit between the two when the cover plate directly contacts the battery cell, thereby improving the stability of the battery.

[0021] In a specific possible implementation manner, the connection block extends through the avoidance hole to a side of the plastic plate facing away from the cover plate;

[0022] The distance between the surface of the connecting block facing away from the cover plate and the surface of the plastic plate facing away from the cover plate is a, and a satisfies: <a≤5mm。

[0023] In the above technical solution, the connecting block protrudes from the plastic plate by a sufficiently large distance, which makes it more convenient to connect the connecting block to the first pole ear than when the surface of the connecting block facing the battery cell is flush with the surface of the plastic plate facing away from the cover plate, or even when the surface of the plastic plate facing away from the cover plate faces the cover plate. At the same time, the value of the spacing a is limited to no more than 5 mm, so as to avoid the problem of too large a gap between the plastic plate and the battery cell after the battery is assembled due to excessive spacing, thereby alleviating the problems of space waste and reduced energy density of the battery.

[0024] In a specific possible implementation manner, the second pole extends through the avoidance hole to a side of the plastic plate away from the cover plate;

[0025] One end of the second pole passing through the avoidance hole is connected to a transfer plate;

[0026] The distance between the side surface of the adapter sheet facing away from the cover plate and the surface of the plastic plate facing away from the cover plate is b;

[0027] a and b satisfy: a=b.

[0028] In the above technical solution, when the battery is assembled, the connecting block and the adapter are synchronously abutted against the corresponding first pole ear and second pole ear, and then fixedly connected by welding, which can ensure the synchronization of the connection with the first pole ear and the second pole ear during the assembly process, facilitate the assembly operation, and improve production efficiency.

[0029] In a second aspect, the present application further provides a battery, comprising a housing, a battery cell disposed in the housing, and a top cover structure as described in any one of the above items for sealing an opening of the housing;

[0030] The connecting block is connected to the first electrode tab of the battery cell;

[0031] The first electrode tab has the same polarity as the first electrode column.

[0032] In the above technical solution, by adopting a top cover structure, the number of separate components that need to be set is reduced, the process is simplified, the production efficiency is improved, and it is easier to control the quality of each component and the overall quality of the battery; reducing independent components and reducing the resistance of the current transmission path makes the internal resistance of the battery itself lower, thereby improving the working efficiency of the battery.

[0033] In a specific embodiment, there are a plurality of battery cells, and at least two battery cells are arranged in the width direction of the battery;

[0034] The connection blocks correspond one by one to the first tabs of the batteries.

[0035] In the above technical scheme, compared with the existing battery structure, the battery cells are stacked in the shell only in the thickness direction of the battery, which can increase the energy density of the battery; and the first pole and the connecting block are directly connected to the first pole lug through the connecting block, and only an adapter plate needs to be set for the second pole. Compared with the situation where the first pole and the second pole need to be respectively provided with corresponding adapter structures, the problem of interference between the adapter plates corresponding to poles of different polarities is reduced; during the design process, only the shape of the adapter plate corresponding to the second pole needs to be considered, and the arrangement of the battery cells needs to be adjusted to reduce the size of the adapter plate, and then the position of the connecting block can be set corresponding to the first pole lug, which makes the overall design and subsequent production and assembly more convenient.

[0036] In a specific embodiment, the area of ​​the surface of the connecting block connected to the first electrode tab is S1;

[0037] The area of ​​the surface of the first electrode tab connected to the connection block is S2;

[0038] S1 and S2 satisfy: S1 / S2≥0.25.

[0039] In the above technical solution, the stability of the connection between the connecting block and the first pole ear is ensured; the situation where the connection area is too small is avoided, that is, the flow area between the connecting block and the first pole ear is large enough to maintain a sufficiently large current transmission efficiency and improve the working efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the overall structure of a battery provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of a top cover structure provided in an embodiment of the present application;

[0042] Figure 3 A schematic cross-sectional view of a top cover structure provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of the relative positions of the connecting block and the second pole provided in an embodiment of the present application.

[0044] Explanation of the reference numerals: 1. Shell; 2. Battery cell; 21. First pole ear; 22. Second pole ear; 3. Cover plate; 31. First surface; 32. Second surface; 4. First pole; 5. Second pole; 6. Connecting block; 7. Adapter; 8. Plastic plate; 81. Avoidance hole. DETAILED DESCRIPTION

[0045] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0046] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0047] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0048] To facilitate understanding of the top cover structure and battery provided in the embodiment of the present application, first of all, the structure of the battery is briefly described. The battery includes a shell, a battery cell arranged in the shell, and a top cover structure for blocking the shell opening. The top cover structure includes a cover plate, a pole inserted on the cover plate and insulated from the cover plate, and the pole column and the pole ear of the battery cell are electrically connected through a connecting piece to form an internal passage of the battery structure. In this battery structure, there are many independent components (poles, connecting links, insulating sealing structures between poles and cover plates, etc.), which cause the production and assembly process of battery components to be more complicated, and the processing efficiency is low. In addition, without considering the influence of material and processing error, the resistance at the connection between different components is greater than the resistance of a single component itself. The more components there are on the current transmission path, the greater the internal resistance of the battery itself will be, which reduces the working efficiency of the battery.

[0049] The embodiment of the present application provides a top cover structure and a battery, which simplifies the battery structure, simplifies the production and assembly process of battery components, facilitates the control of battery quality, reduces the internal resistance of the battery itself, and improves the working efficiency of the battery. The following is a detailed description of it in conjunction with specific drawings and embodiments.

[0050] refer to Figure 1 , Figure 1 The schematic diagram of the structure of the battery provided in the embodiment of the present application is shown. The battery provided in the embodiment of the present application includes a housing 1, a battery cell 2 disposed in the housing 1, and a top cover structure for blocking the opening of the housing 1, wherein the battery cell 2 is located in the housing 1 and is fixedly connected to the housing 1, and can be fixed by bonding with structural adhesive, for example; the top cover structure is fixedly connected to the housing 1, and can be fixed by different fixing methods such as welding, bonding, and clamping.

[0051] refer to Figure 2 and Figure 3The top cover structure includes a cover plate 3, a first pole 4, a second pole 5 and a connecting block 6. The cover plate 3 has a first surface 31 and a second surface 32. The first surface 31 and the second surface 32 are two surfaces that are opposite to each other in the thickness direction of the cover plate 3, and the second surface 32 is the side of the cover plate 3 facing the battery cell 2. The first pole 4 is located on the first surface 31 of the cover plate 3 and is fixedly connected to the cover plate 3. The connecting block 6 is located on the second surface 32 of the cover plate 3 and is also fixedly connected to the cover plate 3. The second pole 5 penetrates the first surface 31 and the second surface 32 of the cover plate 3, is fixed relative to the cover plate 3, and is insulated from the cover plate 3. The battery cell 2 has a first pole lug 21 and a second pole lug. The connecting block 6 is connected to the first pole lug 21 of the battery cell 2, and the second pole 5 is connected to the second pole lug 22 of the battery cell 2. The first pole 4 has the same polarity as the first pole lug 21, and the second pole 5 has the same polarity as the second pole lug 22.

[0052] The connecting block 6 abuts against the first pole ear 21 of the battery cell 2, and an electrical connection between the two is achieved by welding; the second pole 5 is located at one end of the second surface 32 of the cover plate 3 and is connected to the adapter plate 7, and the second pole ear 22 is electrically connected to the second pole 5 through the adapter plate 7; illustratively, the second pole 5, the adapter plate 7 and the second pole ear 22 of the battery cell 2 are fixedly connected by welding to achieve an electrical connection between the three.

[0053] Among them, the connection method between the second pole 5 and the cover plate 3, and the insulation treatment between the second pole 5 and the cover plate 3 can refer to the existing battery structure, the connection structure between the pole and the cover plate 3 and the insulation treatment method, and this part will not be repeated in the embodiment of the present application.

[0054] Through the top cover structure, the first pole 4 is fixedly connected to the cover plate 3, and a connecting block 6 is provided on the second surface 32 of the cover plate 3 to form a protruding structure protruding from the second surface 32, and is electrically connected to the first pole lug 21 of the battery cell 2 through the connecting block 6. In this way, the number of independent components that need to be set is reduced, the process of component production and assembly can be simplified, and the work efficiency is improved. The number of components is reduced, and it is also more convenient to monitor the quality of each component, which is convenient for controlling the quality of the battery as a whole; in addition, the connecting block 6 is directly connected to the first pole lug 21, which reduces the resistance of the transmission path compared to the existing connection method through the connecting sheet, that is, the internal resistance of the battery itself is reduced, and the working efficiency of the battery is improved.

[0055] Exemplarily, the first pole 4 is a positive pole, in which case the cover plate 3 is made of aluminum or an aluminum alloy; of course, in other embodiments, the first pole 4 may be a negative pole, and correspondingly, the cover plate 3 is made of copper or a copper alloy. In specific design, the specific polarity of the first pole 4 may be determined according to actual needs. In the embodiment of the present application, the first pole 4 is taken as an example to illustrate as a positive pole;

[0056] The first pole column 4 and the cover plate 3 can be fixed by welding, or the first pole column 4 and the cover plate 3 can be integrally formed. In the embodiment of the present application, the first pole column 4 and the cover plate 3 are integrally formed. The connecting block 6 is also integrally formed with the cover plate 3. The connecting block 6 can not only be set as a solid block structure, but also the connecting block 6 can be set as a hollow shell structure formed by stamping the cover plate 3; of course, in other embodiments, the connecting block 6 can also be welded and fixed to the cover plate 3.

[0057] In addition, the top cover structure further includes a plastic plate 8. The plastic plate 8 is arranged on one side of the second surface 32 of the cover plate 3 and is attached to the second surface 32 of the cover plate 3. The plastic plate 8 is fixedly connected to the cover plate 3 and / or the housing 1; an avoidance hole 81 for the second pole column 5 and the connecting block 6 to pass through is formed on the plastic plate 8. The arranged plastic plate 8 spaces the cover plate 3 from the battery cell 2. In the case where the cover plate 3 is subjected to an external impact, a certain buffering effect can also be achieved through the plastic plate 8; in addition, the plastic plate 8 is an insulating structure (determined by the nature of the plastic material itself), which can avoid the problem of short circuit when the cover plate 3 is directly in contact with the battery cell 2, and improve the stability of the battery.

[0058] In the state where the top cover structure is assembled with the housing 1, the connecting block 6 abuts against the first pole ear 21 on the battery cell 2, and the electrical connection between the two is realized by welding subsequently. Refer to Figure 3 and Figure 4 , the connecting block 6 is arranged to pass through the avoidance hole 81 and extend to the side of the plastic plate 8背离盖板3的一侧, the distance between the surface of the connecting block 6背离盖板3 and the surface of the plastic plate 8背离盖板3 is a, and a satisfies: 0 < a ≤ 5 mm; and, the position of the connecting block 6 corresponds to the position of the first pole ear 21. In this way, the connection between the connecting block 6 and the first pole ear 21 can be realized more conveniently.

[0059] The connecting block 6 is arranged to protrude from the plastic plate 8 by a sufficient distance. Compared with the situation where the surface of the connecting block 6 facing the battery cell 2 is flush with the surface of the plastic plate 8背离盖板3 or even the surface of the plastic plate 8背离盖板3 faces the cover plate 3, it is more convenient to connect the connecting block 6 and the first pole ear 21. At the same time, the value of the distance a is limited not to exceed 5 mm, so as to avoid the problem of too large a gap between the plastic plate 8 and the battery cell 2 after the battery is assembled due to too large a distance, reducing space waste and the problem of reduced energy density of the battery.

[0060] The second pole column 5 also passes through the avoidance hole 81 to the side of the plastic plate 8背离盖板3. The adapter plate 7 is connected to the end of the second pole column 5 passing through the avoidance hole 81. In the state where the adapter plate 7 is connected to the second pole column 5, the distance between the surface of the adapter plate 7背离盖板3 and the surface of the plastic plate 8背离盖板3 is b, and a = b.

[0061] It should be made clear here that the way in which the second pole 5 is connected to the second pole 5 of the battery cell 2 through the adapter 7 is a design method commonly used in existing battery structures. Therefore, the size of the second pole 5 and the adapter 7, that is, the value of the spacing b can be determined by personnel in this field based on existing design methods.

[0062] When designing the top cover structure, the size of the connecting block 6, that is, the value of the spacing a, is determined according to the value of the spacing b, so that the two remain the same. During the battery assembly process, the top cover structure blocks the opening of the shell 1, so that the connecting block 6 and the adapter plate 7 are synchronously abutted against the respective corresponding first pole lug 21 and second pole lug 22, and are subsequently fixedly connected by welding, which can ensure the synchronization of the connection with the first pole lug 21 and the second pole lug 22 during the assembly process, facilitate the assembly operation, and improve production efficiency.

[0063] It should also be noted that in actual production, if the value of spacing b is greater than 5 mm, the size of the connecting block 6 can be designed according to actual needs, that is, the value of spacing a can also be set to be greater than 5 mm and remain the same as the value of spacing b to ensure that the subsequent welding of the two can be carried out simultaneously to maintain a high production efficiency.

[0064] The connecting block 6 is connected to the first pole lug 21. In order to ensure the stability of the connection and maintain a high current transmission efficiency, it is necessary to ensure that the connection area between the connecting block 6 and the first pole lug 21 is large enough. The area of ​​the surface of the connecting block 6 connected to the first pole lug 21 is S1, and the area of ​​the surface of the first pole lug 21 connected to the connecting block 6 is S2. S1 and S2 satisfy: S1 / S2≥0.25.

[0065] When connecting the connecting block 6 to the first pole lug 21, when the size of the first pole lug 21 is determined, ensure that the size of the connecting block 6 is large enough, S1 is not less than 1 / 4 of S2, to ensure the stability of the connection between the connecting block 6 and the first pole lug 21; avoid the situation where the connection area is too small, that is, the flow area between the connecting block 6 and the first pole lug 21 is large enough to maintain a sufficiently large current transmission efficiency and improve the working efficiency of the battery.

[0066] In addition, reference Figure 1 There are multiple battery cells 2, and at least two battery cells 2 are arranged in the width direction of the battery; correspondingly, there are multiple connection blocks 6, and the multiple connection blocks 6 correspond to the first pole tabs 21 of the multiple batteries. In the embodiment of the present application, two battery cells 2 are arranged in the width direction of the battery for illustration.

[0067] The width direction of the battery refers to the direction parallel to the large surface of the battery cell 2 and perpendicular to the height direction of the battery; of course, in this case, multiple battery cells 2 can also be stacked and arranged in the thickness direction of the battery at the same time.

[0068] Compared with the existing battery structure, the battery cells 2 are stacked only in the thickness direction of the battery in the shell 1, which can increase the energy density of the battery; and in combination with the first pole 4 and the connecting block 6 integrally formed with the cover plate 3, it is directly connected to the first pole lug 21 through the connecting block 6, and only the adapter plate 7 needs to be set for the second pole 5. Compared with the situation where corresponding connecting plates need to be set respectively for the first pole 4 and the second pole 5, the problem of interference between the connecting plates corresponding to poles of different polarities is reduced, and it is more convenient to set the adapter plate 7 to connect the second pole 5 with the second pole lug 22.

[0069] During the design stage, only the size of the adapter 7 connected to the second pole 5 needs to be considered. By adjusting the position of the battery cell 2, the size of the adapter 7 connected to the second pole ear 22 can be as small as possible, which can save materials and reduce the internal resistance of the battery. The position of the connecting block 6 can be designed according to the position of the first pole ear 21, making the overall design process and subsequent production and assembly more convenient.

[0070] Taking the example of two battery cells 2 arranged in the width direction of the battery, the second pole 5 of the battery cell 2 is located in the middle of the battery, and correspondingly, the adapter plate 7 is located in the middle of the battery to realize the connection between the second pole 5 and multiple (four in total as shown in the figure) second pole ears 22; the position of the connecting block 6 is determined according to the size of the battery cell 2 and other data during production, and is distributed on the outside of the battery structure. In this case, since there is no need to set a connecting plate for the first pole 4, it is more convenient to realize the connection between the first pole 4 and multiple first pole ears 21.

[0071] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense; in addition, the term "a plurality" in this application refers to two or more. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A top cover structure, characterized in that: include, A cover plate, wherein the cover plate is made of a conductive material; A first pole, located on the first surface of the cover plate and fixedly connected to the cover plate; A second pole, passing through the first surface and the second surface of the cover plate and insulated from the cover plate; A connecting block, located on the second surface of the cover plate and fixedly connected to the cover plate; The connecting block is used to connect with the first pole lug of the battery cell; The first surface and the second surface are two surfaces facing away from each other in the thickness direction of the cover plate, and the second surface is a side of the cover plate facing the battery cell.

2. The top cover structure according to claim 1, characterized in that: The first pole is a positive pole, and the cover plate is made of aluminum or aluminum alloy.

3. The top cover structure according to claim 1, characterized in that: The first pole is a negative pole, and the cover plate is made of copper or a copper alloy.

4. The top cover structure according to any one of claims 1 to 3, characterized in that: The first pole and the connecting block are integrally formed with the cover plate.

5. The top cover structure according to claim 1, characterized in that: It also includes a plastic plate, which is attached to the second surface of the cover plate, and is provided with an avoidance hole for the second pole and the connecting block to pass through.

6. The top cover structure according to claim 5, characterized in that: The connecting block extends through the avoidance hole to a side of the plastic plate away from the cover plate; The distance between the surface of the connecting block facing away from the cover plate and the surface of the plastic plate facing away from the cover plate is a, and a satisfies: <a≤5mm。 7. The top cover structure according to claim 6, characterized in that: The second pole extends through the avoidance hole to a side of the plastic plate away from the cover plate; One end of the second pole passing through the avoidance hole is connected to a transfer plate; The distance between the side surface of the adapter sheet facing away from the cover plate and the surface of the plastic plate facing away from the cover plate is b; a and b satisfy: a=b.

8. A battery, characterized in that: It comprises a shell, a battery cell arranged in the shell, and a top cover structure as claimed in any one of claims 1 to 7 for blocking an opening of the shell; The connecting block is connected to the first electrode tab of the battery cell; The first electrode tab has the same polarity as the first electrode column.

9. The battery according to claim 8, characterized in that There are a plurality of battery cells, and at least two of the battery cells are arranged in the width direction of the battery; The connection blocks correspond one by one to the first tabs of the batteries.

10. The battery according to claim 8, characterized in that The area of ​​the surface of the connecting block connected to the first electrode tab is S1; The area of ​​the surface of the first electrode tab connected to the connection block is S2; S1 and S2 satisfy: S1 / S2≥0.25.

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