Converging component and battery pack
By designing a bus component composed of multiple series bus units and electrically connected bus monomers, the problem of difficult to ensure the layout accuracy of bus components after the module pallet is cancelled, and high-precision layout and space utilization are improved.
Patent Information
- Application Number
- CN202421188993.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-05-27
AI Technical Summary
After the module tray is cancelled, the arrangement accuracy of the bus parts is difficult to ensure, and the local arrangement accuracy of the bus bar is low.
A bushing component is designed, including a plurality of bushing units connected in series, each bushing unit consists of a plurality of electrically connected bushing monomers, the first end of the bushing monomer is electrically connected to the positive electrode of the battery cell, and the second end is electrically connected to the negative electrode of the battery cell. With this design, the convergence components can be arranged flexibly and can still ensure high accuracy when the module tray is cancelled.
The high-precision arrangement of the confluent parts after the module pallet is cancelled is realized, the volume of the installation and positioning tooling and inspection tooling is reduced, the production cost is effectively reduced, and the space utilization rate in the battery pack is improved.
Smart Images
Figure CN222735292U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and specifically provides a converging component and a battery pack. Background Art
[0002] At present, with the rapid development of the new energy industry, new energy equipment such as electric vehicles and electric aircraft have been widely used, and battery packs as the core part of new energy equipment have also been widely concerned. The mainstream battery packs are generally equipped with square shell cells, cylindrical cells or soft pack cells.
[0003] Generally speaking, the positive and negative poles of the battery cell are located on both sides, and there is a module tray between the battery cell and the busbar, so the installation of the busbar is relatively simple and safe. With the development of technology, the space utilization rate in the battery pack is required to be higher, and the module tray is cancelled, which puts forward new requirements for the layout of the busbar. In addition, the busbar is generally formed in one piece, and the entire arrangement is arranged to the positive and negative poles of the battery cell at one time, and the local arrangement accuracy is low.
[0004] Therefore, the art needs a new busbar design to solve the above problems. Utility Model Content
[0005] The utility model aims to solve the problem of ensuring the arrangement accuracy of the converging components after the module tray is removed.
[0006] In a first aspect, the utility model provides a busbar component, which includes a plurality of busbar units connected in series, the busbar unit includes a plurality of electrically connected busbar monomers, the busbar monomers include a first end and a second end, the first end is used to be electrically connected to the positive electrode of one battery cell, and the second end is used to be electrically connected to the negative electrode of another battery cell.
[0007] Optionally, in the first direction, a plurality of bus units are arranged along the first direction to form a bus group; a plurality of the bus groups are arranged along the second direction, and the first direction is perpendicular to the second direction.
[0008] Optionally, the confluence unit includes one or more confluence monomers connected in series along the second direction.
[0009] Optionally, the confluence unit includes a first confluence monomer and a second confluence monomer, and an effective flow area of the first confluence monomer is greater than an effective flow area of the second confluence monomer.
[0010] Optionally, the first current collecting unit is the current collecting unit located at an edge of the current collecting unit.
[0011] Optionally, the collector component is rectangular, and the first collector unit is located at a non-vertex position of the rectangle.
[0012] Optionally, the first busbar is used to be electrically connected to a temperature sensor.
[0013] Optionally, a coating area is provided between the first end and the second end, and a side of the coating area close to the battery core has an insulating coating.
[0014] Optionally, the battery cell comprises a cylindrical battery cell, and the positive electrode and the negative electrode of the cylindrical battery cell are arranged on the same side.
[0015] In a second aspect, the utility model further provides a battery pack, the battery pack comprising any one of the above-mentioned busbar components, battery cells and a box body, wherein the busbar component and the battery cells are arranged in the box body.
[0016] In the case of adopting the above technical solution, the current collecting component provided by the utility model is divided into a plurality of current collecting units, and each current collecting unit includes a plurality of current collecting monomers. The current collecting components and the battery cells can be flexibly arranged based on the current collecting units. The problem of the accuracy of the arrangement of the current collecting components can still be ensured after the module tray is eliminated. Moreover, the volume of the installation and positioning tooling and the detection tooling can be greatly reduced, which effectively reduces the production cost.
[0017] Furthermore, the positive and negative poles of the cylindrical battery cell are located on the same side, the gap between the positive and negative poles is small, and there is no module tray to isolate the battery cell and the busbar component; by dividing the battery cell small unit and the busbar unit, corresponding inspection tooling and busbar component auxiliary installation tooling can be designed to achieve high efficiency, accuracy and safety in the installation of the busbar component on the cylindrical battery cell.
[0018] Furthermore, according to the thermal simulation results, the effective flow area of some of the individual converging units can be increased, thereby locally enhancing the temperature rise and flow capacity of the converging component.
[0019] Furthermore, in order to avoid electrical interference between the positive and negative welding ends of a single busbar cell, an insulating film (such as a PET film, etc.) is pasted in the corresponding area in the prior art. However, the insulating film has a certain thickness, and the precision control of the pasting is difficult. The present application changes it to a UV coating, and sprays the insulating coating on the coating area of the busbar cell through a spraying process, which is simpler for precision control. In addition, the coating is relatively thin, which can effectively reduce the distance between the busbar component and the battery cell, thereby improving the space utilization in the height direction of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:
[0021] Figure 1 A schematic diagram of a first type of confluence unit provided by the utility model;
[0022] Figure 2A schematic diagram of a second confluence unit provided by the utility model;
[0023] Figure 3 A schematic diagram of a busbar component and a battery cell provided by the utility model;
[0024] Figure 4 A schematic diagram of the current direction of a converging component of the utility model;
[0025] Figure 5 It is a schematic diagram of the first type of busbar group of the utility model;
[0026] Figure 6 It is a schematic diagram of the second busbar group of the utility model.
[0027] List of reference numerals:
[0028] 10. Busbar component; 110. Busbar unit; 111. Busbar monomer; A. First end of busbar monomer; B. Second end of busbar monomer; 100. Busbar group; 1111. First busbar monomer; 1112. Second busbar monomer; 112. Coating area; 20. Battery cell; 201. Positive electrode of battery cell; 202. Negative electrode of battery cell; X. First direction; Y. Second direction. DETAILED DESCRIPTION
[0029] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.
[0030] It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "top", "bottom" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "connect", and "install" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] As mentioned in the background technology, with the development of technology, the space utilization rate in the battery pack is required to be higher, the module tray is cancelled, and new requirements are put forward for the layout of the busbar. In addition, the busbar is generally formed in one piece and arranged to the positive and negative electrodes of the battery cell at one time, and the local layout accuracy is low.
[0033] In order to solve the above problems, the utility model provides an improved busbar component and battery pack.
[0034] See also Figures 1 to 4 , Figure 1 and Figure 2 Schematic diagrams of two types of confluence units 110 are provided; Figure 3 is a schematic diagram of a busbar component 10 and a battery cell 20; Figure 4 is a schematic diagram of the current direction of a converging component 10; Figure 5 is a schematic diagram of a first busbar group 100; Figure 6 is a schematic diagram of a second busbar assembly 100 .
[0035] In the first aspect, the present application provides a busbar component 10, the busbar component 10 includes a plurality of busbar units 110 connected in series, and the busbar unit 110 includes a plurality of electrically connected busbar monomers 111. The electrical connection here may refer to series connection or parallel connection. The busbar monomer 111 includes a first end A and a second end B, the first end A is used to electrically connect to the positive electrode 201 of one battery cell 20, and the second end B is used to electrically connect to the negative electrode 202 of another battery cell 20.
[0036] The busbar component 10 may also be called a busbar, a busbar, a bar sheet or a busbar, etc. It is a component for realizing electrical connection between the battery cells 20 .
[0037] The electrically connected structure of two adjacent battery cells 20 is used as a busbar monomer 111, and multiple busbar monomers 111 ( Figure 1 There are 4 in the middle. Figure 2 16 in the example) as a confluence unit 110, different confluence units 110 are the same, and a plurality of confluence monomers 111 in a confluence unit 110 may be the same or different. Figure 1 and Figure 2 The multiple convergence units 111 in the convergence unit 110 are different. Multiple convergence units 110 constitute the convergence component 10 of the present application, and the convergence component 10 and the battery cell 20 can be flexibly arranged based on the convergence unit 110. In addition, when the convergence component 10 is set on the battery cell 20, since each convergence unit 110 is the same, an installation positioning tool and / or a detection tool can be designed for a single convergence unit 110. As a result, the accuracy of the convergence component layout can still be guaranteed after the module tray is eliminated. Moreover, the volume of the installation positioning tool and the detection tool can be greatly reduced, effectively reducing the production cost.
[0038] With the development of battery cell technology, a large cylindrical battery cell is gradually being applied to the market and has become a trend. As the advantages of battery cells to battery packs gradually become more prominent, it will be increasingly valued and applied, and the manufacturing process from battery cells to the entire pack has become a key factor.
[0039] In a specific example, Figures 1 to 6 As shown in the figure, the battery cell 20 may refer to a cylindrical battery cell, and the positive electrode 201 and the negative electrode 202 of the cylindrical battery cell are arranged on the same side of the cylindrical battery cell 20.
[0040] The multiple cylindrical cells 20 corresponding to each busbar unit 110 can be used as a cell subunit. By dividing the cell subunit and busbar unit 110, corresponding inspection tools and busbar auxiliary installation tools can be designed to achieve a module-free tray design, and quickly, efficiently and safely install the busbar on the cylindrical cell. The minimum design of these tools is only for a single cell subunit and a single busbar unit 110.
[0041] In this embodiment, the positive and negative electrodes (including the positive electrode 201 and the negative electrode 202) of the cylindrical battery cell 20 are located on the same side, the gap between the positive electrode 201 and the negative electrode 202 is small, and there is no module tray isolation between the battery cell 20 and the busbar component 10; by dividing the battery cell small unit and the busbar unit 110, corresponding inspection tooling and busbar component auxiliary installation tooling can be designed to achieve high efficiency, accuracy and safety in installing the busbar component on the cylindrical battery cell.
[0042] It should be noted that the battery cell 20 may also refer to at least one of a cylindrical battery cell, a square shell battery cell, and a soft-pack battery cell, and the limitations of the busbar components of other types of battery cells are not repeated here.
[0043] In a second aspect, the utility model can also provide a method for installing the busbar component 10 on the battery cell 20 group, which specifically includes the following steps:
[0044] Step 1: Install the minimum designed battery cell inspection tooling on each battery cell small unit, so that the holes on the battery cell inspection tooling correspond to the positive pole 201 of each cylindrical battery cell 20 one by one, and the lower surface of the battery cell inspection tooling fits the surface of the negative pole 202 of the cylindrical battery cell 20, and check whether the battery cell inspection tooling can be installed. If not, the position of the battery cell small unit does not meet the requirements; if it can be installed, check whether the lower surface of the tooling and the surface fit of the negative pole 202 of the cylindrical battery cell 20 meet the requirements through the reserved holes on the battery cell inspection tooling.
[0045] Step 2: detect the position and surface fit of each battery cell unit in turn along the current flow direction of the busbar component; when all the battery cell units meet the conditions, continue to execute the following steps.
[0046] Step 3, install the busbar component 10 on the auxiliary installation tooling, install the two on the cylindrical battery cell group, and then weld the positive electrode 201 of the cylindrical battery cell 20 to the first end A of each busbar unit 111 by welding. At this time, the position of the busbar component 10 and the battery cell group is fixed and no longer offset occurs, and the tooling is removed; the auxiliary installation tooling can be designed for one or more busbar units 110.
[0047] Step 4: Repeat step 3 to weld the remaining busbar components 10 to the battery cell group.
[0048] In one embodiment, see Figure 5 A plurality of bus units 110 are arranged along a first direction X to form a bus group 100 , and a plurality of bus groups 100 are arranged along a second direction Y, wherein the first direction is perpendicular to the second direction.
[0049] That is, in the first direction X, a plurality of busbar units 110 are connected in series to form a busbar group 100; in the second direction Y, adjacent busbar groups 100 are connected end to end in series. Figure 4 The direction of the arrow.
[0050] Optionally, the first direction X is perpendicular to the second direction Y, that is, a plurality of bus groups 100 are arranged along the length direction of the battery pack, and the plurality of bus groups 100 are connected end to end to form a current path loop for the battery cells in the battery pack.
[0051] In another embodiment, see Figure 6 , you can also Figure 5 The first direction and the second direction are interchanged, and the current flow direction remains
[0052] Figure 6 The middle includes three busbar groups 100 (one busbar group is included in each dotted line frame), and a gap along the X direction can be added in the middle busbar group, and a crossbeam can be arranged in the gap.
[0053] Figure 6 The current direction can still be maintained Figure 4 direction, that is, the current direction is deployed according to the bus unit 110, breaking through the limitation of the bus group.
[0054] In one embodiment, adjacent busbar groups 100 are connected in series via one or more busbar units 110. Optionally, the one or more busbar units 110 are arranged along the second direction Y and are connected in series with each other.
[0055] In one embodiment, each busbar unit 110 includes a plurality of busbar cells 111 connected in series along the second direction. Figure 1In the example, each busbar unit 110 includes four busbar units 111 connected in series along the second direction.
[0056] In one embodiment, see Figure 1 In the confluence unit 110 , the effective flow area of the first confluence monomer 1111 is greater than the effective flow area of the second confluence monomer 111 . That is, in the same confluence unit 110 , at least two types of confluence monomers are included: the first confluence monomer 1111 and the second confluence monomer 1112 .
[0057] The first confluence unit 1111 is at least one confluence unit 111 located at the edge of the confluence unit 110. By arranging the first confluence unit 1111 at the edge of the confluence unit 110, the spatial arrangement inside the confluence unit 110 can be more reasonable.
[0058] Compared with the second collector monomer 1111, the first collector monomer 1111 has a larger effective flow area, which can make the first collector monomer 1111 have better flow capacity. When a large current is passed, the temperature rise of the first collector monomer 1111 is smaller.
[0059] According to the thermal simulation results, the effective flow area of some individuals in the convergence monomer 111 can be enlarged and recorded as the first convergence monomer 1111, so as to locally enhance the temperature rise and flow capacity of the convergence component 10.
[0060] In one embodiment, Figure 4 , Figure 5 and Figure 6 As shown, the busbar component 10 is rectangular, and the first busbar monomer 1111 is located at a non-vertex position of the rectangle. In the battery pack, the temperature of the battery cells 20 at the four corners of the pack is greatly affected by the external temperature, and the heat preservation effect is also poor in severe cold weather, that is, these four battery cells need a better current temperature rise to achieve self-heating in severe cold weather, so it should be avoided to design the busbar monomer 111 connecting these four battery cells as the first busbar monomer 1111.
[0061] In one embodiment, the first busbar monomer 1111 is used to be electrically connected to a temperature sensor. Optionally, the temperature sensor may include a thermistor (Negative Temperature Coefficient, NTC for short). Since the effective flow area of the first busbar monomer 1111 is larger, its corresponding surface area is also larger, and there is sufficient space to arrange the temperature sensor.
[0062] In one embodiment, a coating area 112 (i.e., the shaded area in the figure) is provided between the first end A and the second end B of the current collector 111, and an insulating coating is sprayed on a side of the coating area 112 close to the battery cell 20. Optionally, the insulating coating is a UV coating (i.e., an ultraviolet coating).
[0063] Generally, in order to avoid electrical interference between the first end A and the second end B of a single collector unit 111, an insulating film (such as a PET film, etc.) is pasted in the corresponding area. However, the insulating film has a certain thickness, and the precision control of the pasting is difficult. The present application changes it to a UV coating, and sprays the insulating coating on the coating area of the collector unit through a spraying process, which is simpler for precision control. In addition, the thickness of the coating is small, which can effectively reduce the distance between the collector component 10 and the battery cell 20, thereby improving the space utilization in the height direction of the battery pack.
[0064] In a second aspect, the utility model further provides a battery pack, which includes the current collector 10, battery cells 20 and a box body (not shown in the figure) of any one of the above items, and the current collector 10 and the battery cells 10 are arranged in the box body.
[0065] Optionally, the box body includes a box cover, a lower box body and a bottom plate, the lower box body includes a plurality of side walls connected end to end, the box cover and the bottom plate are respectively covered on two sides of the lower box body, thereby forming a closed cavity in the box body. The above-mentioned converging component 10 and the battery cell 20 are arranged in the cavity.
[0066] In one embodiment, the top of the battery cell 20 faces the box cover, the bottom of the battery cell 20 faces the bottom plate, the positive electrode 201 and the negative electrode 202 of the battery cell 20 are arranged on the side facing the box cover, and the busbar component 10 is arranged between the battery cell 20 and the box cover.
[0067] Optionally, the positive electrode 201 of each battery cell is welded to the first end A of the busbar 111, the negative electrode 202 of the battery cell is welded to the second end B of the busbar 111, a gap is provided on the busbar component 10, the top of the battery cell 20 passes through the gap and is bonded to the box cover, and the bottom of the battery cell 10 is bonded to the bottom plate. Using adhesive bonding as a connection method can reduce the application of connection components as much as possible, so as to further improve the space utilization rate in the battery pack.
[0068] In a third aspect, the utility model further provides a vehicle, and the vehicle of the utility model includes the above-mentioned battery pack.
[0069] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.
[0070] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
Claims
1. A confluence component, characterized in that: The busbar component includes a plurality of busbar units connected in series, the busbar unit includes a plurality of electrically connected busbar monomers, the busbar monomers include a first end and a second end, the first end is used to be electrically connected to the positive electrode of one battery cell, and the second end is used to be electrically connected to the negative electrode of another battery cell.
2. The conduit component according to claim 1, characterized in that: A plurality of the busbar units are arranged along a first direction to form a busbar group, and a plurality of the busbar groups are arranged along a second direction, wherein the first direction is perpendicular to the second direction.
3. The current collecting component according to claim 1 or 2, characterized in that: The confluence unit includes one or more confluence cells connected in series along the second direction.
4. The conduit component according to claim 1, characterized in that: The confluence unit includes a first confluence monomer and a second confluence monomer, and an effective flow area of the first confluence monomer is greater than an effective flow area of the second confluence monomer.
5. The busbar component according to claim 4, characterized in that: The first current collecting unit is the current collecting unit located at the edge of the current collecting unit.
6. The conduit component according to claim 4 or 5, characterized in that: The collector component is rectangular, and the first collector unit is located at a non-vertex position of the rectangle.
7. The current collecting component according to claim 4 or 5, characterized in that: The first busbar is used for being electrically connected to a temperature sensor.
8. The current collecting component according to claim 1 or 2, characterized in that: A coating area is arranged between the first end and the second end, and a side of the coating area close to the battery core has an insulating coating.
9. The current collecting component according to claim 1 or 2, characterized in that: The battery cell comprises a cylindrical battery cell, and the positive electrode and the negative electrode of the cylindrical battery cell are arranged on the same side.
10. A battery pack, characterized in that: The battery pack comprises the busbar component, a battery cell and a case as claimed in any one of claims 1 to 9, wherein the busbar component and the battery cell are arranged in the case.