Busbar-less battery module and battery pack

Abstract

This application relates to the field of power battery technology, and in particular to a busbarless battery module and a battery pack. The busbarless battery module provided by this application comprises a plurality of cells (3), each of which is provided with a tab (31) at both ends, and the interconnected cells (3) are directly connected via the tabs (31), and a partition member is provided between adjacent cells (3). The tabs of this application are directly connected, and by eliminating the busbar, it is possible to avoid blocking high-temperature exhaust gas by the busbar, and even in the event of thermal runaway, it is possible to timely discharge high-temperature exhaust gas, and it is also possible to isolate the tabs of the cells, prevent thermal runaway caused by short circuit due to contact between adjacent tabs during operation, and prevent heat diffusion in the tabs.

Description

[Technical Field]

[0001] This application relates to the field of battery technology, for example, busbar-less battery modules and battery packs. [Background technology]

[0002] With growing concern about environmental protection issues, new energy electric vehicles are becoming increasingly popular. The energy density of a battery pack is related to the driving range of an electric vehicle. To meet high energy requirements, battery packs currently use a large number of secondary batteries in a series-parallel configuration. As the energy density of battery packs increases, their thermal safety issues become increasingly serious. Because battery pack safety directly affects the safety of electric vehicles and their passengers, battery pack safety issues are an obstacle to the widespread use of electric vehicles. How to effectively resolve battery pack safety issues has become an urgent technical challenge.

[0003] With the development of the electric vehicle industry, the cost requirements for battery pack systems in electric vehicle factories are becoming increasingly stringent, which is promoting the standardization of cells and battery modules. Battery modules have been adopted by more and more battery manufacturers in China in recent years, and although the overall appearance and size of battery modules are similar, their structures are different.

[0004] In related technologies, cell thickness is often limited due to cell expansion restrictions, etc. This places greater constraints on the busbar size after the cells are grouped. However, under high-rate charge / discharge conditions, considering factors such as overcurrent capability, spatial constraints on busbar size, and assembly requirements for the welding process, it is not appropriate to continue using the busbar method to achieve series-parallel connection.

[0005] Therefore, there is an urgent need for busbar-less battery modules and battery packs to solve the above-mentioned technical problems. Summary of the Invention

[0006] The busbar-less battery module and battery pack provided by the present application are designed without busbars, preventing high-temperature exhaust gases from being blocked by busbars and allowing high-temperature exhaust gases to be discharged in a timely manner even during thermal runaway. At the same time, the cell tabs are isolated, preventing thermal runaway caused by short circuits due to adjacent tabs coming into contact during operation and preventing heat diffusion across the tabs.

[0007] First, the present application provides a busbar-less battery module including a plurality of cells, each of which has a tab at each end, the interconnected cells being directly connected to each other via the tabs, and a partition member being provided between adjacent cells.

[0008] As a preferred optional technical solution for the busbar-less battery module, the partition member is a heat insulating panel, and the busbar-less battery module further includes an outer plate, the outer plate including two side panels arranged opposite to each other and two end plates arranged opposite to each other, the end plates being arranged between the side panels; The insulating panels are provided between adjacent cells (3), and the first end of each insulating panel is located within the area enclosed by the connection of the tabs of the adjacent cells, and the distance between the second end of each insulating panel and the end plate is shorter than the distance from the tab to the end plate.

[0009] An optional technical solution for the busbarless battery module is that it further includes a partition holder, which is disposed between the cells and divides the cells into a plurality of cell sets, each cell set including at least two cells, the distance from a first end of the partition holder to the end plate being shorter than the distance from the tab to the end plate, and the second ends of the partition holders are both located within an area enclosed by the connection of the tabs of adjacent cells.

[0010] As an optional technical proposal for the above busbarless battery module, the partition holder comprises a first partition holder and a second partition holder, the first partition holder comprises a first frame and an insulating layer provided on both sides of the first frame, the first frame has a first groove-shaped passage through which electric wires can be passed along the longitudinal direction, and the second partition holder comprises a second frame and an insulating layer provided on both sides of the second frame.

[0011] As an optional technical solution for the above busbar-less battery module, the tabs of the cells on both sides of the first partition holder are welded via connectors, and the tabs of the cells on both sides of the second partition holder and the insulation panel are welded to each other.

[0012] In an optional technical solution for the busbar-less battery module, the first frame and the second frame are both made of metal.

[0013] As an optional technical solution for the busbar-less battery module, the first frame includes partition plates and horizontal plates, the partition plates are spaced apart, and the horizontal plates are arranged between the partition plates, with both ends of each horizontal plate connected to the partition plate, and the horizontal plates are spaced apart.

[0014] As an optional technical solution for the busbar-less battery module, a plurality of vent holes are provided in the end plate, and the plurality of cells and the plurality of vent holes are provided in one-to-one correspondence.

[0015] As an optional technical solution for the busbar-less battery module, reinforcing ribs are provided within the space surrounded by the vent hole, and the reinforcing ribs are provided at intervals along the longitudinal direction of the vent hole.

[0016] An optional technical solution for the busbar-less battery module is that no insulating holders are provided on both ends of the cells.

[0017] As an optional technical solution for the busbar-less battery module, the partition member is a tab holder, and the multiple cells are connected in series or parallel via tabs, the tab holder is provided at one end of the cell, and at least one end of the tab holder is connected to an output pole, the tab holder includes a harness area and a tab partition area connected to the harness area, and multiple separators are provided in the tab partition area, and the multiple separators are provided at intervals to form connection holes, each of which has a tab punched therein, and the tabs punched in the same connection hole are folded over and directly fixedly connected to each other.

[0018] As an optional technical solution for the busbar-less battery module, a plurality of harness limiting buckles and a plurality of harness fixing posts are provided in the harness area, and one harness fixing post is provided above each of the connection holes.

[0019] An optional technical solution for the busbar-less battery module is that it further includes a partition holder, which is arranged between the cells to divide the cells into a plurality of cell sets, each of which includes at least two of the cells.

[0020] An optional technical solution for the above busbarless battery module is that the partition holder comprises a first partition holder and a second partition holder, the first partition holder is located at the center of the battery module, and the second partition holder is provided on both sides of the first partition holder, the first partition holder comprises a first frame and an insulating layer provided on both sides of the first frame, the first frame is provided with a first groove-shaped passage through which electric wires can be passed along the longitudinal direction, and the second partition holder (6) comprises a second frame and an insulating layer provided on both sides of the second frame.

[0021] As an optional technical solution for the busbarless battery module, the tabs of the cells on both sides of the first partition holder are welded via connectors, and the tabs of the cells on both sides of the second partition holder are welded to each other.

[0022] In an optional technical solution for the busbar-less battery module, the first frame and the second frame are both made of metal.

[0023] In an optional technical solution of the busbar-less battery module, the first frame includes partition plates and horizontal plates, the partition plates are spaced apart, and the horizontal plates are arranged between the partition plates, each horizontal plate is connected to a partition plate, and the horizontal plates are spaced apart to form a first groove-shaped passage.

[0024] An optional technical solution for the busbar-less battery module is one in which the busbar-less battery module further includes outer plates, each of which includes a top plate, a bottom plate, two side panels arranged opposite each other, and two end plates arranged opposite each other, each end plate being connected to one of the two side panels, and the top plate, bottom plate, two end plates, and two side panels being connected to form a cavity for accommodating the cells, and a plurality of vent holes being provided in the end plates, each of which corresponds to one of the cells.

[0025] As an optional technical solution for the busbar-less battery module, a reinforcing rib is provided within the space surrounded by the ventilation hole. Second, the present application further provides a battery pack including the above-mentioned busbar-less battery module. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a structural schematic diagram of a busbar-less battery module provided in embodiment 1 of the present application. [Figure 2] FIG. 1 is an exploded schematic view of a busbar-less battery module provided by embodiment 1 of the present application. [Figure 3] FIG. 1 is a cross-sectional view of a busbar-less battery module provided in embodiment 1 of the present application. [Figure 4] FIG. 4 is an enlarged view of a portion A in FIG. [Figure 5] FIG. 4 is an enlarged view of a portion B in FIG. [Figure 6] FIG. 2 is a structural schematic diagram of a busbar-less battery module provided in embodiment 2 of the present application. [Figure 7] FIG. 2 is a structural schematic diagram of a tab holder provided in embodiment 2 of the present application. [Figure 8] FIG. 8 is an enlarged view of a portion C in FIG. 7. [Figure 9] FIG. 10 is a partially enlarged view of the tab provided in the second embodiment of the present invention, which is connected to the connector after passing through the tab holder. [Figure 10] FIG. 10 is a partial view of a first divider holder provided in a second embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0027] In the description of this application, unless otherwise clearly defined and limited, the technical terms "coupled," "connected," and "fixed" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, an internal connection between two members, or an interactive relationship between two members. Those skilled in the art can understand the specific meaning of the above technical terms in the present application in specific situations.

[0028] Unless otherwise clearly defined and limited, in this application, a first feature being "above" or "below" a second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, a first feature being "above," "above," or "on the upper surface" of a second feature may include being directly above or diagonally above the second feature, or simply meaning that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," or "on the lower surface" of a second feature may include being directly below or diagonally below the second feature, or simply meaning that the horizontal height of the first feature is lower than that of the second feature.

[0029] In the description of this embodiment, directions or positional relationships such as "upper," "lower," and "right" are based on the directions or positional relationships shown in the drawings, and are merely for the convenience of explanation and to simplify the operation. They do not require the devices or components shown or implied to have a specific direction or a specific structure or operation, and therefore should not be understood as limiting the present application. In addition, the technical terms "first" and "second" are used to distinguish between the above and other terms in the description, and do not have any special meaning.

[0030] The present application provides a busbar-less battery module and a battery pack, the battery pack including a busbar-less battery module, the busbar-less battery module including a plurality of cells (3), each of which has a tab (31) at both ends, the interconnected cells (3) being directly connected via the tabs (31), and a partition member being provided between adjacent cells (3).

[0031] The present application will be described in detail below in combination with drawings and embodiments.

[0032] Embodiment 1 This embodiment 1 provides a battery pack, which, after thermal runaway occurs, isolates adjacent tabs to prevent the thermal runaway tab from affecting the adjacent tab and causing thermal runaway in the adjacent tab, thereby preventing heat diffusion in the tabs.

[0033] The battery pack includes a busbar-less battery module, and as shown in Figures 1 and 2, the busbar-less battery module includes an outer plate, a bottom plate, a top plate 7, and a plurality of cells 3. The top plate 7 and the bottom plate are respectively provided on the top and bottom of the outer plate and connected to the outer plate. Of these, the outer plate includes two opposing side panels 1 and two opposing end plates 2, and the end plates 2 are provided between the side panels 1.

[0034] As shown in Figures 3 to 5, tabs 31 are provided on both ends of the cells 3, and the interconnected cells 3 are directly connected via the tabs 31, and the tabs 31 are connected in series or in parallel. Insulation panels 4 are provided between adjacent cells 3, and the first end of each insulation panel 4 is located within the area surrounded by the connection of the tabs 31 of the adjacent cells 3, and the distance between the second end of each insulation panel 4 and the end plate 2 is shorter than the distance from the tab 31 to the end plate 2.

[0035] Insulation panels 4 are provided between adjacent cells 3. Because the battery module does not have busbars, the busbar-free design prevents the busbars from blocking high-temperature exhaust gas. Therefore, the tabs 31 are directly connected, allowing high-temperature exhaust gas to be released in a timely manner even during thermal runaway. Neither of the two insulation panels 4 is located within the area surrounded by the welded tabs. The two spaced insulation panels 4 confine the welded tabs 31 to a single isolation area, which isolates the welded tabs 31 from each other and reduces the thermal diffusivity of the welded tabs 31. After the busbars are removed, the tabs 31 are directly connected, for example, by welding, which is beneficial for effectively releasing high-temperature exhaust gas during thermal runaway.

[0036] The busbar-less battery module comprises an outer plate and multiple cells. The outer plate has two opposing side panels and two opposing end plates, with the end plates located between the side panels. Tabs are provided on both ends of the cells, allowing the cells to be directly connected via the tabs. An insulating panel is provided between adjacent cells, with the first end of each insulating panel located within the area enclosed by the tabs of the adjacent cells, and the distance between the second end of each insulating panel and the end plate is shorter than the distance from the tab to the end plate. Because the insulating panels are provided between adjacent cells and the battery module does not have busbars, eliminating the busbars prevents high-temperature exhaust gas from being blocked by the busbars. This allows the tabs to be directly connected, allowing high-temperature exhaust gas to be discharged in a timely manner even during thermal runaway. The distance between the second end of each insulation panel and the end plate is shorter than the distance from the tab to the end plate. The two spaced-apart long insulation panels confine the welded tabs to a single isolated area (i.e., they are not located within the area surrounded by the welded tabs. The two spaced-apart insulation panels confine the tabs to a single isolated area). This isolated area prevents thermal runaway caused by short circuits between adjacent tabs during operation. This isolated area also isolates the welded tabs from each other, reducing the thermal diffusivity of the welded tabs. The direct connection of the tabs after the busbars are removed is beneficial for effectively discharging high-temperature exhaust gases during thermal runaway. The insulation panels are longer than those with busbars, providing a better thermal insulation effect.

[0037] When a busbar-less battery module is large, the rate of thermal diffusion after thermal runaway of a single cell 3 is rapid. To reduce this thermal diffusion, referring to FIG. 2 , in this embodiment, the busbar-less battery module further includes a partition holder. The partition holder is disposed between the cells 3 to divide the cells 3 into multiple cell sets, with each cell set including at least two cells 3. The number of cells 3 in each cell set can be evenly or unevenly distributed, and it is understood that the number of cells 3 in each cell set is limited according to actual requirements. The distance from the first end of the partition holder to the end plate 2 is shorter than the distance from the tab 31 to the end plate 2, and the second end of the partition holder is located within the area enclosed by the connection of the tab 31 of adjacent cells 3. That is, the first end of the partition holder can be disposed against the end plate 2, thereby dividing the cells 3 into independent cell sets. The combination of the partition holder and the insulation panel 4 can effectively reduce the thermal diffusivity of the cells 3.

[0038] Optionally, the partition holder includes a first partition holder 5 and a second partition holder 6. The first partition holder 5 includes a first frame and a thermal insulation layer on both sides of the first frame, and the first frame is provided with a first groove-shaped passage through which electrical wires can be passed along the longitudinal direction, facilitating wiring of the busbar-less battery module. The second partition holder 6 includes a second frame and a thermal insulation layer on both sides of the second frame. Both the first partition holder 5 and the second partition holder 6 include a thermal insulation layer, which can reduce thermal diffusivity. As a result, the first partition holder 5 and the second partition holder 6 can effectively reduce the thermal diffusivity of one cell set after thermal runaway occurs, preventing adjacent cell sets from experiencing thermal runaway in a short period of time.

[0039] Since the first partition holder 5 is provided with a first groove-shaped passage along its length through which electrical wires can pass, the thickness of the first partition holder 5 is greater than that of the second partition holder 6. To connect the tabs 31 of the cells 3 on both ends of the first partition holder 5, in this embodiment, as shown in FIGS. 3-5 , the tabs 31 of the cells 3 on both sides of the first partition holder 5 are welded via connectors 8, that is, the tabs 31 of the cells 3 located on both sides of the first partition holder 5 are welded to the same connectors 8 to connect the tabs 31, and the connectors 8 are copper plates. Also, in this embodiment, the tabs 31 of the cells 3 on both sides of the second partition holder 6 and the insulation panel 4 are directly welded to each other to form a single unit.

[0040] In this embodiment, the busbar is eliminated and the tabs 31 are directly welded, which is convenient for effectively discharging high-temperature exhaust gas during thermal runaway. At the same time, insulating holders are not provided at both ends of the cells 3, and instead, the insulating holders are provided with tab holders. This allows for the design of longer insulation panels 4 using the available space. The longer the insulation panels 4, the more effectively they can suppress heat diffusion. When the insulation panels 4 and end plates 2 abut, the insulation panels 4 and end plates 2 on both sides of the tab 31 form a grid, which prevents heat from one tab 31 from diffusing to adjacent tabs 31. Optionally, both the first and second frames are made of metal. Both the first and second frames are made of metal aluminum. This design improves the strength of the first partition holder 5 and the second partition holder 6.

[0041] Optionally, the first frame includes partition plates and horizontal plates, the partition plates are spaced apart, the horizontal plates are spaced apart, and both ends of each horizontal plate are connected to a partition plate, and the horizontal plates are spaced apart. Spaced horizontal plates form a first groove-shaped passage, which is not only convenient for wiring the busbar-less battery modules, but also improves the strength of the first partition holder 5.

[0042] To remove high-temperature gas from the busbar-less battery module, referring to FIGS. 1 and 2 , in this embodiment, multiple vents 21 are provided in the end plate 2, and multiple vents 21 are provided corresponding to multiple cells 3, respectively. Providing each vent 21 corresponding to each cell 3 allows for the unidirectional exhaust of thermal runaway cells 3, which is beneficial for slowing down the runaway of the cells 3 and improving the safety of the battery pack. The vents 21 are waist-shaped, i.e., elongated, holes. Their long length affects the overall strength of the busbar-less battery module. Therefore, in this embodiment, reinforcing ribs are optionally provided within the space surrounded by the vent 21. For example, multiple reinforcing ribs are provided at intervals along the length of the vent 21. The multiple reinforcing ribs are provided within the space defined by the vent 21 and along the length of the vent 21, effectively improving the strength of the end plate 2.

[0043] Each side panel 1 is provided with an output electrode, and the tabs 31 of the cells 3 adjacent to the side panel 1 are welded to the output electrode via copper wire to ensure normal use of the busbar-less battery module.

[0044] The insulating layer and the insulating panel 4 may also be made of insulating ceramic material, aluminum oxide, or glass fiber.

[0045] Embodiment 2 Cell thickness is often limited due to cell expansion restrictions and other factors. This places greater constraints on the busbar size after the cells are grouped. However, under high-rate charge / discharge conditions, considering factors such as overcurrent capability, spatial constraints on busbar size, and assembly requirements for the welding process, it is not appropriate to continue using the busbar method to achieve series-parallel connection. For this reason, this embodiment provides a battery module that does not have a busbar, but instead directly and fixedly connects the cell tabs. The tab partition area prevents short circuits caused by contact between the tabs on both sides of the tab partition area, ensuring the reliability of the module even without a busbar.

[0046] As shown in Figure 6, the busbar-less battery module includes multiple cells 3, tab holders 9, a partition holder, and an outer plate having a cavity. The outer plate includes a top plate 7, a bottom plate, two side panels 1, and two end plates 2. The two side panels 1 are arranged opposite each other, and both ends of each end plate 2 are connected to the side panels 1, and the two end plates 2 are arranged opposite each other with a gap between them. The top plate 7 is arranged on top of the end plates 2 and side panels 1, and the bottom plate is arranged on the bottom of the end plates 2 and side panels 1. The top plate 7, bottom plate, two side panels 1, and two end plates 2 are connected to form a cavity for accommodating the cells 3. The cells 3, tab holders 9, and partition holders are arranged in the cavity surrounded by the outer plate. The multiple cells 3 are connected in series or parallel via tabs 31, and the tab holder 9 is arranged at one end of the cells 3.

[0047] 7, at least one end of the tab holder 9 is connected to the output pole, and the tab holder 9 includes a harness area 91 and a tab partition area 92 connected to the harness area 91. The tab partition area 92 is provided with a plurality of separators 921, which are spaced apart to form connection holes 922, each of which has a tab 31 drilled therein, and the tabs 31 drilled in the same connection hole 922 are folded over and directly fixedly connected to each other. A second groove-shaped passage is provided in the harness area 91.

[0048] In the battery module provided in this embodiment, the tabs 31 are folded and directly fixedly connected to each other, and the busbar-free design allows cells 3 to be directly connected to each other, simplifying the manufacturing process and effectively reducing costs. The busbar-free design also provides ample space for other components. The busbar-free design also prevents high-temperature exhaust gases from being blocked by the busbars, allowing high-temperature exhaust gases to be expelled in a timely manner even during thermal runaway. The tab partition area 92 of the tab holder 9 isolates the tabs 31, preventing short circuits caused by contact between the tabs 31 during battery module operation. The second groove-shaped passage organizes the low-voltage collector wires, ensuring the reliability of the battery module.

[0049] Optionally, referring to Fig. 8, in this embodiment, a plurality of harness limiting buckles 911 and a plurality of harness fixing posts 912 are provided in the harness area 91, and the harness fixing posts 912 are provided above each of the connection holes 922. The harness limiting buckles 911 and the harness fixing posts 912 are combined and used to fix the harness, so that the low-voltage collector wires are neatly laid in the harness area 91 of the tab holder 9, the space at the end of the tab holder 9 can be used rationally, and the low-voltage collector wires can be prevented from becoming messy.

[0050] When the battery module is large, the speed of diffusion after thermal runaway of a single cell 3 is fast. To reduce heat diffusion, in this embodiment, the battery module further includes a partition holder, which is disposed between the cells 3 to divide the cells 3 into multiple cell sets, each cell set including at least two cells 3. After a cell 3 of one cell set experiences thermal runaway, the partition holder can prevent the heat generated by the runaway cell 3 from spreading to other cell sets that are not experiencing runaway. The number of cells 3 in each cell set can be distributed evenly or unevenly, and it is understood that the number of cells 3 in each cell set is limited according to actual requirements.

[0051] Optionally, as shown in FIG. 6, the partition holder includes a first partition holder 5 and a second partition holder. The first partition holder 5 includes a first frame and a heat insulating layer on both sides of the first frame. The first frame has a first groove-shaped passage for passing electrical wires along its length, facilitating wiring of the battery module. The second partition holder includes a second frame and a heat insulating layer on both sides of the second frame. Both the first partition holder 5 and the second partition holder 6 include a heat insulating layer, which can reduce thermal diffusivity. This allows the first partition holder 5 and the second partition holder to effectively reduce the thermal diffusivity of one cell set after thermal runaway occurs, preventing adjacent cell sets from experiencing thermal runaway in a short period of time. The first partition holder 5 is located in the middle of the battery module, and the second partition holders are located on both sides of the first partition holder 5. The number of the first partition holder 5 is one, and the number of the second partition holders is at least two.

[0052] Because the first partition holder 5 has a first groove-shaped passage along its length through which electrical wires can pass, the thickness of the first partition holder 5 is greater than that of the second partition holder. To connect the tabs 31 of the cells 3 on both ends of the first partition holder 5, in this embodiment, as shown in FIG. 9 , the tabs 31 of the cells 3 on both sides of the first partition holder 5 are welded to the same connector 8. In one embodiment, the connector 8 is a copper plate. In this embodiment, the tabs 3 of the cells 3 on the second partition holder are directly welded to each other to form a single unit. In this embodiment, the busbar is omitted, and the tabs 31 are directly welded, which is convenient for effectively discharging high-temperature exhaust gas during thermal runaway. Optionally, both the first and second frames are made of metal. Both the first and second frames are made of metal aluminum. This design improves the strength of the first partition holder 5 and the second partition holder.

[0053] 10, the first frame may include partition plates 51 and horizontal plates 52, with the partition plates 51 spaced apart and the horizontal plates 52 spaced apart, with both ends of each horizontal plate 52 connected to the partition plate 51. The horizontal plates 52 are spaced apart to form a first groove-shaped passage, which is convenient for wiring the battery modules, and the horizontal plates 52 also improve the strength of the first partition holder 5.

[0054] To remove high-temperature gas from within the battery module, in this embodiment, as shown in FIG. 6 , multiple vents 21 are provided in the end plate 2, with each corresponding to a corresponding one of the cells 3. By providing each vent 21 in correspondence with each cell 3, a function of exhausting thermal runaway cells 3 in one direction is realized, which is advantageous for slowing down the runaway of the cells 3 and improving the safety of the battery pack. Optionally, the vents 21 are waist-shaped holes, i.e., elongated holes. Since the length of the vents 21 affects the strength of the entire battery module, in this embodiment, reinforcing ribs are provided within the space surrounded by the vents 21. For example, the reinforcing ribs are provided at intervals along the length of the vents 21. The reinforcing ribs are provided within the space formed by the vents 21 and along the length of the vents 21, which effectively improves the strength of the end plate 2.

[0055] Each side panel 1 is provided with an output terminal, and the tab 31 of the cell 3 adjacent to the side panel 1 is welded to the output terminal via a copper wire to ensure normal use of the battery module.

[0056] A second embodiment of the present invention further provides a battery pack, the battery pack including the busbar-less battery module according to the second embodiment. [Explanation of symbols]

[0057] 1. Side panel 2. End plate 21. Ventilation hole 3. Cell 31, Tab 4. Heat insulation panel 5. First partition holder 51. Partition board 52, horizontal board 6. Second divider holder 7. Top plate 8. Connector 9. Tab holder 91. Harness area 911, harness restraint buckle 912, harness fixing post 92. Tab divider area 921, Separator 922, connection hole

Claims

1. A busbar-less battery module comprising a plurality of cells (3), The vehicle comprises an outer panel including two side panels (1) arranged opposite each other and two end plates (2) arranged opposite each other between the side panels (1), Tabs (31) facing the end plates (2) are provided at both ends of each cell (3), the interconnected cells (3) are directly connected via the tabs (31), and a partition member is provided between adjacent cells (3); The partition member is a heat insulating panel (4) formed to extend from one of the end plates (2) toward the other of the end plates (2), The end plates (2) are provided between the side panels (1), The heat insulating panels (4) are provided between adjacent cells (3), The plurality of insulating panels (4) include: the insulating panel (4) having a first end located within an area enclosed after connection of the tabs (31) of adjacent cells (3); The insulation panel (4) has a second end at a position where the distance from the end plate (2) is shorter than the distance from the tab (31) to the end plate (2). A busbar-less battery module characterized by:

2. Further provided with a partition holder, The partition holder is provided between the cells (3) to divide the plurality of cells (3) into a plurality of cell sets; Each cell set comprises at least two cells (3), The distance from the first end of the partition holder to the end plate (2) is shorter than the distance from the tab (31) to the end plate (2); 2. The busbar-less battery module according to claim 1, wherein the second ends of the partition holders are all located within an area surrounded by tabs (31) of the adjacent cells (3) after connection.

3. The partition holder comprises a first partition holder (5) and a second partition holder (6), The first partition holder (5) comprises a first frame and a heat insulating layer provided on both sides of the first frame; The first frame is provided with a first groove-shaped passage through which an electric wire can be passed along a longitudinal direction, The busbar-less battery module according to claim 2, wherein the second partition holder (6) comprises a second frame and a heat insulating layer provided on both sides of the second frame.

4. The tabs (31) of the cells (3) on both sides of the first partition holder (5) are welded via connectors (8); 4. The busbar-less battery module according to claim 3, wherein the tabs (31) of the cells (3) on both sides of the second partition holder (6) and the insulation panel (4) are welded to each other.

5. The busbar-less battery module according to claim 3 , wherein the first frame and the second frame are both made of metal.

6. The first frame includes a partition plate (51) and a horizontal plate (52), The partition plates (51) are spaced apart, and the horizontal plates (52) are disposed between the partition plates (51), The busbar-less battery module according to claim 3, wherein both ends of each of the horizontal plates (52) are connected to the partition plate (51), and the horizontal plates (52) are arranged at intervals.

7. The end plate (2) is provided with a plurality of ventilation holes (21), The busbar-less battery module according to claim 1, wherein the plurality of cells (3) and the plurality of vent holes (21) are provided in a one-to-one correspondence.

8. 8. The busbar-less battery module according to claim 7, wherein reinforcing ribs are provided in a space surrounded by the ventilation hole (21), and the reinforcing ribs are provided at intervals along the longitudinal direction of the ventilation hole (21).

9. The busbar-less battery module according to any one of claims 1 to 7, characterized in that no insulating holders are provided on both ends of the cells (3).

10. A busbar-less battery module comprising a plurality of cells (3), The vehicle comprises an outer panel including two side panels (1) disposed opposite to each other and two end plates (2) disposed opposite to each other between the side panels (1), Tabs (31) facing the end plates (2) are provided at both ends of each cell (3), the interconnected cells (3) are directly connected via the tabs (31), and a partition member is provided between adjacent cells (3); The partition member is a tab holder (9), The plurality of cells (3) are connected in series or in parallel via tabs (31); A tab holder (9) is provided between each end of the plurality of cells (3) and each end plate, Each of the plurality of tab holders (9) extends in the arrangement direction of the plurality of cells (3) and includes a harness area (91) that collectively outputs low-voltage collector wires extending from the tabs (3) to an output pole, and a tab partition area (92) that is connected to the harness area (91) and separates the plurality of tabs (31) that are fixedly connected to adjacent plurality of cells (3), The tab partition area (92) is provided with a plurality of separators (921) arranged along the arrangement direction of the cells, Between the plurality of separators (921), connection holes (922) are formed at intervals, A busbar-less battery module characterized in that a plurality of the tabs (31) are drilled in each of the connection holes (922), and the plurality of tabs (31) drilled in the same connection hole (922) are folded over and directly fixedly connected to each other.

11. 11. The busbar-less battery module according to claim 10, wherein the harness area (91) is provided with a plurality of harness limiting buckles (911) and a plurality of harness fixing posts (912), and one harness fixing post (912) is provided above each of the connection holes (922).

12. Further provided with a partition holder, The partition holder is provided between the cells (3) to divide the plurality of cells (3) into a plurality of cell sets; The busbar-less battery module according to claim 10, wherein each of the cell sets includes at least two of the cells (3).

13. The partition holder comprises a first partition holder (5) and a second partition holder (6), The first partition holder (5) is located at the center of the battery module, and the second partition holders (6) are provided on both sides of the first partition holder (5), respectively; The first partition holder (5) comprises a first frame and a heat insulating layer provided on both sides of the first frame; The first frame is provided with a first groove-shaped passage through which an electric wire can be passed along a longitudinal direction thereof, The busbar-less battery module according to claim 12, wherein the second partition holder (6) comprises a second frame and a heat insulating layer provided on both sides of the second frame.

14. The tabs (31) of the cells (3) provided on both sides of the first partition holder (5) are welded via connectors (8); The busbar-less battery module according to claim 13, characterized in that the tabs (31) of the cells (3) on both sides of the second partition holder (6) are welded to each other.

15. The busbar-less battery module according to claim 13 , wherein the first frame and the second frame are both made of metal.

16. The first frame includes a partition plate (51) and a horizontal plate (52), The partition plates (51) are spaced apart, and the horizontal plates (552) are disposed between the partition plates (51), 14. The busbar-less battery module according to claim 13, wherein each of the horizontal plates (52) is connected to a respective one of the partition plates (51), and the horizontal plates (52) are spaced apart to form a first groove-shaped passage.

17. Both ends of each end plate (2) are connected to two of the side panels (1), The top plate (7), the bottom plate, the two end plates (2), and the two side panels (1) are connected to form a cavity for accommodating the cells (3); 11. The busbar-less battery module according to claim 10, wherein a plurality of vent holes (21) are provided in the end plate (2), and a plurality of the cells (3) and a plurality of the vent holes (21) are provided in correspondence with each other.

18. The busbar-less battery module according to claim 17, characterized in that a reinforcing rib is provided within a space surrounded by the ventilation hole (21).

19. A battery pack comprising the busbar-less battery module according to any one of claims 1 to 18.

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