Long cell modules, battery packs and power units

Abstract

The present application relates to the field of battery technology, and in particular to a long cell module, a battery pack, and a power device. The long cell module includes: a battery module, the battery module includes a first cell and a second cell; the length of the first cell and the length of the second cell both extend along a first direction; a reinforcing beam, the first cell and the second cell are respectively connected to the reinforcing beam; a busbar component, the busbar component is arranged between the first cell and the second cell, and the busbar component is simultaneously connected to the first cell and the second cell. The long cell module provided in the embodiment of the present application, by arranging an intermediate busbar component between the cells, compresses the shoulder size of the two cells, saves the number of sampling assemblies used and the installation space, effectively improves the space utilization rate of the cells in the entire package, reduces intermediate components, and fully utilizes the utilization rate of the entire package in the width direction, thereby significantly increasing the power of the entire package without significantly increasing the volume of the entire package.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a long battery cell module, a battery pack and a power device. Background Art

[0002] The contemporary automotive industry is undergoing revolutionary changes, with traditional fuel vehicles being gradually replaced by new energy vehicles. Pure electric vehicles, a key new energy vehicle, are emerging. Many fuel vehicle platforms have simply replaced their engine structure with a power battery pack, shifting the vehicle's power source from fuel to batteries. With the emergence of new energy vehicles on the market, people are demanding higher range from electric vehicles. The same battery parameters translate to a longer range, requiring more cells to be arranged in an electric vehicle's battery pack. A matrix battery pack can significantly increase battery pack volume utilization, thereby extending the vehicle's range.

[0003] Currently, most matrix battery packs on the market use cells whose length is less than half of the width of the entire pack. There are too many intermediate components in the length direction of the cells, and the space in the width direction of the entire pack is not fully utilized, resulting in the inability to further increase the power of the entire pack. Summary of the Invention

[0004] The purpose of this application is to provide a long battery cell module, a battery pack and a power device, so as to solve, to a certain extent, the technical problems existing in the prior art of low internal space utilization of the battery pack and difficulty in increasing the power of the entire pack.

[0005] The present application provides a long battery cell module, comprising: a battery module, the battery module comprising a first battery cell and a second battery cell; the length of the first battery cell and the length of the second battery cell both extend along a first direction;

[0006] a reinforcing beam, the first battery cell and the second battery cell being respectively connected to the reinforcing beam;

[0007] A current collecting component is provided between the first battery core and the second battery core, and is connected to both the first battery core and the second battery core.

[0008] In the above technical solution, further, the number of the battery modules is multiple, and the multiple battery modules are arranged sequentially along the length direction of the reinforcing beam;

[0009] The first battery cell of each battery module is arranged on one side of the reinforcing beam, and the second battery cell is arranged on the other side of the reinforcing beam.

[0010] In any of the above technical solutions, further, the converging component includes:

[0011] a first connecting portion connected to a first end output electrode of the first battery cell;

[0012] a second connecting portion connected to the first end output electrode of the second battery cell;

[0013] A third connecting portion, through which the first connecting portion and the second connecting portion are connected.

[0014] In any of the above technical solutions, further, the long battery cell module further includes a collection component, the first connecting portion is provided with the collection component, and the collection component is connected to the shell of the first battery cell;

[0015] The second connecting portion is provided with another collecting component, and the collecting component is connected to the shell of the second battery cell.

[0016] In any of the above technical solutions, further, the long battery cell module further includes a first collecting member and a second collecting member, the first collecting member is provided at an end of the first battery cell away from the reinforcing beam, and the second collecting member is provided at an end of the second battery cell away from the reinforcing beam;

[0017] The first collecting portion of the first collecting member is connected to the second end output pole of the first battery cell, and the first collecting portion of the second collecting member is connected to the second end output pole of the second battery cell;

[0018] The second collecting portion of the first collecting member is electrically connected to the collecting component, and the second collecting portion of the second collecting member is electrically connected to the collecting component.

[0019] The present application also provides a battery pack, comprising the long cell module described in any of the above technical solutions, and thus having all the beneficial technical effects of the long cell module, which will not be repeated here.

[0020] The battery pack further comprises: a housing, the housing comprising a lower housing, the battery module and the reinforcing beam being disposed within the lower housing;

[0021] A fixed connecting piece, the reinforcing beam and the lower shell are connected through the fixed connecting piece.

[0022] In any of the above technical solutions, further, the battery pack further includes:

[0023] a housing, the housing comprising a lower housing, the battery module and the reinforcement beam being disposed within the lower housing;

[0024] A fixed connecting piece, the reinforcing beam and the lower shell are connected through the fixed connecting piece.

[0025] In any of the above technical solutions, further, the battery pack further includes:

[0026] A first fastener, wherein a fixing portion is provided at an end of the reinforcing beam, and the fixing portion is connected to the fixed connector via the first fastener;

[0027] A second fastener is used to connect the fixed connector to the lower shell.

[0028] In any of the above technical solutions, further, the length of the battery module is L0, the shell has a predetermined width W2 extending along the first direction, and L0 / W2=0.85-0.98.

[0029] In any of the above technical solutions, further, the battery pack further includes:

[0030] a connecting plate, the connecting plate being arranged above the battery module, and each of the first battery cells and each of the second battery cells being connected to the connecting plate;

[0031] A cold plate is disposed below the battery module.

[0032] The present application also provides a power device, including the long battery cell module and battery pack described in any of the above technical solutions, and thus has all the beneficial technical effects of the long battery cell module and battery pack, which will not be repeated here.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] The long battery cell module provided in the present application includes: a battery module, the battery module includes a first battery cell and a second battery cell; the length of the first battery cell and the length of the second battery cell both extend along the first direction; a reinforcing beam, the first battery cell and the second battery cell are respectively connected to the reinforcing beam; a busbar component, the busbar component is arranged between the first battery cell and the second battery cell, and the busbar component is connected to the first battery cell and the second battery cell at the same time.

[0035] The long battery cell module provided in the embodiment of the present application compresses the shoulder size of the two battery cells by setting an intermediate current collecting component between the battery cells, saves the number of sampling assemblies used and the installation space, and effectively improves the space utilization rate of the battery cells in the whole package, especially in the width direction of the whole package, reduces the intermediate components, and fully utilizes the utilization rate of the whole package in the width direction, thereby significantly improving the power of the whole package without significantly increasing the volume of the whole package.

[0036] The battery pack provided in the present application includes the long battery cell module described above. Therefore, the long battery cell module can fully utilize the entire pack space of the battery pack, significantly improve the power and endurance of the battery pack, and at the same time help the battery pack to be designed to be small in size and lightweight.

[0037] The power device provided in the present application includes the above-mentioned battery pack, and thus has the advantages of small size, large power, and long endurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0039] Figure 1 A schematic diagram of the structure of the battery pack provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of a portion of the structure of a battery pack provided in an embodiment of the present application;

[0041] Figure 3 A schematic diagram of the arrangement of battery modules of a long cell module provided in an embodiment of the present application;

[0042] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at A;

[0043] Figure 5 A cross-sectional view of a battery pack provided in an embodiment of the present application from one viewing angle;

[0044] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at B;

[0045] Figure 7 A schematic structural diagram of a first collecting component provided in an embodiment of the present application;

[0046] Figure 8 This is a schematic diagram of the state of the conduit component provided in an embodiment of the present application before bending.

[0047] Reference numerals:

[0048] 1-battery module, 101-first battery cell, 1011-first pole, 1012-third pole, 102-second battery cell, 1021-second pole, 1022-fourth pole, 2-reinforcement beam, 201-first fixing part, 3-collecting member, 301-first connecting part, 302-second connecting part, 303-third connecting part, 4-collecting component, 5-first collecting member, 6-base, 7-first collecting part, 8-second collecting part, 9-low-voltage plug-in, 10-lower shell, 11-fixed connector, 12-first fastener, 13-second fastener, 14-cold plate, 15-connecting plate, 16-upper cover, 17-BMS, 18-BDU, m-first direction, n-second direction. DETAILED DESCRIPTION

[0049] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0050] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0051] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0052] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0054] Refer to the following Figures 1 to 8 The long cell module, battery pack and power device according to the embodiments of the present application are described.

[0055] See also Figures 1 to 8 As shown, an embodiment of the present application provides a long battery cell module, which includes a battery module 1 and a reinforcing beam 2, wherein the battery module 1 includes a first battery cell 101 and a second battery cell 102. Preferably, the first battery cell 101 and the second battery cell 102 are both rectangular, and more preferably, the first battery cell 101 and the second battery cell 102 have the same structure. The first battery cell 101 and the second battery cell 102 are arranged along the same straight line at intervals. Preferably, the length of the first battery cell 101 and the length of the second battery cell 102 both extend along a first direction m; the reinforcing beam 2 is in the shape of an elongated strip, preferably a rectangular beam, and the length of the reinforcing beam 2 extends along a second direction n different from the first direction m. Preferably, the first direction m and the second direction n are two directions perpendicular to each other. The first battery cell 101 has a first end and a second end distributed along its length, wherein the first end of the first battery cell 101 is the end adjacent to the reinforcing beam 2. Similarly, the second battery cell 102 also has a first end and a second end distributed along its length, wherein the first end of the second battery cell 102 is the end adjacent to the reinforcing beam 2. The end surface of the first end of the first battery cell 101 is connected to the reinforcing beam 2 by, but not limited to, bonding. The end surface of the first end of the second battery cell 102 is also connected to the reinforcing beam 2 by, but not limited to, bonding. Preferably, the bottom wall thickness of the reinforcing beam 2 is greater than 1 mm, which can ensure both the structural rigidity of the reinforcing beam 2 and the strength of the connection with the fixing connector 11 described below.

[0056] Furthermore, there are multiple battery modules 1, each of which includes a group of first battery cells 101 and second battery cells 102. The multiple first battery cells 101 are arranged on the same side of the reinforcing beam 2 and are arranged sequentially along the second direction n. Preferably, the multiple first battery cells 101 are stacked sequentially along the thickness direction of the first battery cells 101, or in other words, the large surfaces of two adjacent first battery cells 101 face each other. Similarly, the multiple second battery cells 102 are arranged on the other side of the reinforcing beam 2, and the multiple second battery cells 102 are stacked sequentially along the second direction n, with the large surfaces of two adjacent second battery cells 102 abutting each other.

[0057] Furthermore, the number of reinforcing beams 2 can also be multiple, and the multiple reinforcing beams 2 are arranged at intervals. More advanced, the multiple reinforcing beams 2 and the above-mentioned multiple battery modules 1 are all arranged in the shell, wherein the multiple reinforcing beams 2 can be arranged in the shell at intervals along the first direction m, or can be arranged in the shell at intervals along the second direction n, or the reinforcing beams 2 are arranged in the shell in a matrix shape, and each reinforcing beam 2 is provided with a plurality of first battery cells 101 on one side, and each reinforcing beam 2 is provided with a plurality of second battery cells 102 on the other side. Preferably, two adjacent first battery cells 101 and two adjacent second battery cells 102 can be fixed by clamping or bonding to ensure the stability of each battery cell in the shell and relative to the reinforcing beam 2. It should be noted that the first direction m corresponds to the width direction of the shell, and the second direction n corresponds to the length direction of the shell.

[0058] Furthermore, the multiple first cells 101 on one side of the reinforcing beam 2 form a module, and the multiple second cells 102 on the other side of the reinforcing beam 2 form another module. The multiple cells in each module are connected in series. A gap is formed between adjacent cells in each module, and the gap is ≥ 0.1 mm and ≥ 0.2 times the cell thickness (a).

[0059] Preferably, a spacer material is provided in the gap between the battery cells.

[0060] Furthermore, the present long cell module also includes a busbar component 3, and there are multiple busbar components 3. A busbar component 3 is provided between each group of first cells 101 and second cells 102. The first ends of the first cells 101 and the first ends of the second cells 102 of the same battery module 1 are connected to the same busbar component 3. Specifically, the first end of the first cell 101 and the first end of the second cell 102 are end surfaces facing each other, and each first end has a first end output pole, and each other end has a second end output pole, wherein the first end output pole of the first cell 101 includes at least a first pole 1011, and the first end output pole of the second cell includes at least a second pole 1021.

[0061] The current collecting member 3 includes a first connecting portion 301, a third connecting portion 303, and a second connecting portion 302 arranged in sequence. Preferably, the first connecting portion 301, the third connecting portion 303, and the second connecting portion 302 have an integral structure and are integrally formed. The current collecting member 3 is conductive and flexible. The first connecting portion 301 is attached to and connected to the first electrode 1011, and the connection method may be, but is not limited to, welding. The second connecting portion 302 is attached to and connected to the second electrode 1021, and the connection method may also be, but is not limited to, welding. The third connecting portion 303 is located between the first connecting portion 301 and the second connecting portion 302. Preferably, after the current collecting member 3 is connected between the first battery cell 101 and the second battery cell 102, a distance of 0.2 mm to 20 mm is formed between the first connecting portion 301 and the second connecting portion 302 to prevent contact between the first connecting portion 301 and the second connecting portion 302.

[0062] It should be noted that, in this embodiment, the battery module 1 adopts an AB battery cell arrangement. Specifically, the first connection part 301 of each busbar component 3 is connected to the output positive pole of the first battery cell 101, and the second connection part 302 is connected to the output negative pole of the second battery cell 102, or the first connection part 301 of each busbar component 3 is connected to the output negative pole of the first battery cell 101, and the second connection part 302 is connected to the output positive pole of the second battery cell 102.

[0063] Furthermore, the first battery cell 101 and the second battery cell 102 are each provided with an explosion-proof valve. Preferably, the explosion-proof valve is provided on other wall surfaces of the first battery cell 101 except the first end and the two large surfaces of the first battery cell 101 and on other wall surfaces of the second battery cell 102 except the first end and the two large surfaces of the second battery cell 102.

[0064] Furthermore, in the initial state, the third connection part 303 is set at an angle to the first connection part 301 and the second connection part 302, so that the third connection part 303 forms a bending structure between the first connection part 301 and the second connection part 302. When assembling this long battery cell module, the first connection part 301 is first connected to the first pole 1011 and the second connection part 302 is connected to the second pole 1021. After that, force is applied to the busbar component 3 so that the third connection part 303 is further bent on the basis of the original bending until it is close to the degree of folding in half, so that the first connection part 301 and the second connection part 302 are arranged facing each other. At this time, the first battery cell 101 and the second battery cell 102 are close to each other and distributed along the same straight line along the first direction m, and at this time the busbar component 3 spans the reinforcing beam 2, so that the first end of the first battery cell 101 and the first end of the second battery cell 102 can respectively contact and be bonded to the side wall surface of the reinforcing beam 2.

[0065] Furthermore, after the first connection part 301 is connected to the first battery cell 101 and the second connection part 302 is connected to the second battery cell 102, force is applied to the middle position of the busbar component 3 to bend the busbar component 3 at the third connection part 303. After the third connection part 303 is bent into a U-shape, the length of the first battery cell 101 and the length of the second battery cell 102 are distributed along the same straight line, completing the insertion of the two battery cell structures. After the bending is completed, the third connection part 303 is located between the first battery cell 101 and the second battery cell 102, and the third connection part 303 does not protrude relative to the outer wall of either side of the first battery cell 101 or the outer wall of either side of the second battery cell 102, so as to avoid interference, collision or short circuit between the third connection part 303 and other structures or components.

[0066] Preferably, after completing the above operations, a shoulder distance of 4mm-40mm is formed between the first end face of the first battery cell 101 and the first end face of the second battery cell 102. The shoulder distance should not be too small, otherwise they cannot be grouped. The shoulder distance should not be too large, otherwise it will easily affect the size and power of the entire package.

[0067] Preferably, in Figure 6 In the shown state, the first pole 1011 is arranged near the upper part of the first end face of the first battery cell 101, and the second pole 1021 is arranged near the upper part of the first end face of the second battery cell 102. More preferably, the first pole 1011 forms a distance of 2mm-30mm from the upper edge of the first end face of the first battery cell 101. Similarly, the busbar component 3 is located in the upper half of the space between the first battery cell 101 and the second battery cell 102, which can ensure that the first battery cell 101 and the second battery cell 102 are smoothly fixed to the reinforcing beam 2, thereby avoiding interference between the busbar component 3 and the reinforcing beam 2.

[0068] Furthermore, the collecting component 3 also includes a collecting component 4, which is conductive and sheet-shaped. The collecting component 4 can be, but is not limited to, a nickel sheet. There are two collecting components 4, one of which is overlapped on the first connecting portion 301, and the collecting component 4 is in contact with and connected to the outer shell of the first battery cell 101, and the other collecting component 4 is overlapped on the second connecting portion 302, and the collecting component 4 is in contact with the outer shell of the second battery cell 102.

[0069] Furthermore, the present long cell module also includes a collection member. Preferably, there are two collection members, namely a first collection member 5 and a second collection member. The first collection member 5 is disposed at the second end of the first cell 101, and the second collection member is disposed at the second end of the second cell 102. The structure and connection method of the first collection member 5 are the same as those of the second collection member. Furthermore, the second end output pole of the first cell 101 includes a third pole 1012 disposed at the second end of the second cell and a busbar connected to the third pole 1012. The second end output pole of the second cell 102 includes a fourth pole 1022 disposed at the second end of the second cell 102 and another busbar connected to the fourth pole 1022.

[0070] It should be noted that the first pole 1011 and the third pole 1012 at both ends of the first battery cell 101 and the second pole 1021 and the fourth pole 1022 at both ends of the second battery cell 102 are all high-voltage output stages of the battery cells.

[0071] Taking the first collecting component 5 as an example, the first collecting component 5 includes a base 6 and a first collecting portion 7 and a second collecting portion 8 arranged on the base 6, wherein the base 6 is in a long strip shape and extends along the second direction n. The base 6 spans the second end of each first battery cell 101. There are multiple first collecting portions 7, and the multiple first collecting portions 7 are arranged on the base 6 at intervals along the second direction n. The number of first collecting portions 7 is the same as the number of first battery cells 101, and each first collecting portion 7 is arranged corresponding to one first battery cell 101.

[0072] Furthermore, the first collecting portion 7 of each first collecting member 5 is connected to the second end output pole of the first battery cell 101. Specifically, the first collecting portion 7 can be connected to the third pole 1012 or to a bus bar provided on the third pole 1012, so that the voltage of the second end output pole of the first battery cell 101 can be collected by the first collecting portion 7.

[0073] The second collecting portion 8 of the first collecting member 5 is overlapped with the shell of the first battery cell 101. Preferably, the second collecting portion 8 is overlapped with and fixed to the top cover of the shell of the first battery cell 101. As described above, the collecting component 4 is simultaneously connected to the first pole 1011 and the shell of the first battery cell 101. When the second collecting portion 8 is also connected to the shell of the first battery cell 101, the second collecting portion 8 is conducted to the first pole 1011 through the shell of the first battery cell 101 and the collecting component 4, so that the equipotential voltage of the first pole 1011 can be collected by the second collecting portion 8. It can be seen that through the cooperation of the first collecting portion 7 and the second collecting portion 8, the voltages of the two output poles of the first battery cell 101 are simultaneously collected by the first collecting member 5, which reduces the amount of collecting components and saves the space occupied by the collecting components.

[0074] The same is true for the second collection component. Those skilled in the art will fully understand it and will not be described in detail here. The second collection component also has a base, a first collection part and a second collection part. The specific structure of the second collection component and the arrangement relative to the second battery cell 102 can be completely referred to the arrangement of the first collection component 5 described above. Those skilled in the art will fully understand it and will not be described in detail here. It can be seen that the long battery cell module provided by this application only uses sampling components on both sides, saving the sampling assembly between the first battery cell 101 and the second battery cell 102. It should be noted that the sampling at one end of the first battery cell 101 near the second battery cell 102 and the flexible circuit board connected to the sampling are saved here. Similarly, the sampling at one end of the second battery cell 102 near the first battery cell 101 and the flexible circuit board are also saved, so that the sampling assembly is only used on both sides of the battery module 1, which is equivalent to doubling the use of the sampling assembly, effectively reducing the shoulder distance between the first battery cell 101 and the second battery cell 102, and reducing the space occupied and volume occupied by the battery module 1 relative to the width direction of the shell, thereby effectively improving the total power of the battery pack using this long battery cell module.

[0075] Furthermore, the collection component also includes a low-voltage plug-in 9, which is arranged on the base 6 of the first collection component 5 and the base of the second collection component for external connection to transmit the signals collected by the first collection component 5 and the second collection component to the outside.

[0076] In addition, this long battery cell module also includes a flexible circuit board (not shown in the figure), the collection component is connected to the flexible circuit board, and the above-mentioned current collection component 3 is also electrically connected to the flexible circuit board. It should be noted that the current collection component 3 and the collection component are respectively connected to different modules on the flexible circuit board.

[0077] To sum up, the long battery cell module provided in the embodiment of the present application compresses the shoulder size of the two battery cells by setting an intermediate collecting component 3 between the battery cells, saves the number of sampling assemblies used and the installation space, and effectively improves the space utilization of the battery cells in the whole package, especially in the width direction of the whole package, reduces the intermediate components, and fully utilizes the utilization rate of the whole package in the width direction, thereby significantly improving the power of the whole package without significantly increasing the volume of the whole package.

[0078] The embodiments of the present application also provide a battery pack, including the long cell module described in any of the above embodiments, and thus having all the beneficial technical effects of the long cell module, which will not be repeated here. The battery pack also includes a shell, a fixed connector 11, and a connection assembly used in conjunction with the fixed connector 11. The shell includes at least a lower shell 10. Each first cell 101 and each second cell 102 of the battery module 1 are arranged in the shell and located on the bottom plate of the lower shell 10. The fixing method can be, but is not limited to, bonding. The reinforcement beam 2 is also arranged on the bottom plate of the lower shell 10. The fixing method between the reinforcement beam 2 and the lower shell 10 can be, but is not limited to, bonding or fastener fixing. The fixed connector 11 has a block structure. Preferably, the length of the reinforcement beam 2 is greater than the total length of the multiple battery modules 1 arranged, so that one end of the reinforcement beam 2 protrudes by a predetermined length relative to the first battery module 1 to form a first fixing portion 201, and the other end of the reinforcement beam 2 also protrudes by a predetermined length relative to the last battery module 1 to form a second fixing portion.

[0079] Furthermore, the battery pack further includes a cold plate 14 , which is disposed on the bottom plate of the lower housing 10 , and a plurality of battery modules 1 are disposed on the cold plate 14 , so that the cold plate 14 can regulate the temperature of each battery module 1 and each battery cell.

[0080] Preferably, explosion-proof valves are installed on the bottom wall of the first battery cell 101 and the bottom wall of the second battery cell 102. The bottom plate of the lower housing 10 is provided with reinforcing ribs whose lengths are parallel to the length of the first battery cell 101. After the first and second battery cells 101, 102 are secured to the bottom plate of the lower housing 10, the vertical projections of the ribs and the explosion-proof valves do not overlap. The bottom wall of the battery cells is bonded to the bottom plate of the lower housing 10, avoiding the position of the explosion-proof valves. The bonding area is 60%-100%. The explosion-proof valves can be bonded to the cold plate 14 using a thermally conductive structural adhesive with a thermal conductivity of no more than 5 W / (m·k) and a bonding area of ​​60%-100%.

[0081] A notch is formed at the bottom of the first fixing portion 201, and the shape of the fixing connector 11 is adapted to the shape of the inner wall surface of the first fixing portion 201, so that the fixing connector 11 can be arranged in the first fixing portion 201, and the outer wall surface of the fixing connector 11 can be fitted with the inner wall surface of the first fixing portion 201. At the same time, the bottom wall of the fixing connector 11 is fitted and fixed to the cold plate 14 or the bottom plate of the lower shell 10, and the fixing method can be but is not limited to welding or bonding.

[0082] The connection assembly includes a first fastener 12 and a second fastener 13. The first fastener 12 penetrates the first fixing portion 201 and the top wall of the fixed connector 11 to connect and secure the fixed connector 11 to the first fixing portion 201. There is at least one first fastener 12. In this embodiment, there are preferably two first fasteners 12. The first fastener 12 may be, but is not limited to, a rivet. The second fastener 13 penetrates the bottom wall of the fixed connector 11 and then connects to the cold plate 14, or continues through the cold plate 14 to connect to the bottom plate of the lower housing 10, thereby connecting and securing the fixed connector 11 to the cold plate 14 or the lower housing 10, thereby securing the reinforcing beam 2 and the battery module 1 connected to the reinforcing beam 2 within the lower housing 10. There is at least one second fastener 13. In this embodiment, there are preferably two second fasteners 13. The second fastener 13 may be, but is not limited to, an FDS (Flow Drill Screw).

[0083] The second fixing portion is connected to the cold plate 14 via another fixing connector 11 and another connecting assembly, and the reinforcing beam 2 and cold plate 14 are fixed using FDS nails. Preferably, the edge of the cold plate 14 is fixed to the bottom plate of the lower shell 10 using multiple FDS nails, thereby further improving the rigidity of the cold plate 14, enhancing the fixing strength of the battery module 1, and thus improving the rigidity of the entire battery pack using this. More preferably, a sealing gasket is provided at the location where the fixing connector 11 penetrates the second fastener 13, thereby enhancing the sealing effect while ensuring the connection strength.

[0084] In one embodiment of the present application, preferably, Figure 2 As shown, the number of reinforcing beams 2 can be specifically one, the number of battery modules 1 can be an even number or an odd number, and the battery modules 1 are fixed in the battery pack with a first-order frequency greater than 50 Hz. Each battery module 1 includes a first battery cell 101 and a second battery cell 102. The total length of each battery module 1 is L0. It should be noted that L0 here includes the first battery cell 101, the second battery cell 102, the distance between them, and the total length of the end output pole including the ends of both. The total length L0 of the battery module 1 is the dimension of the maximum outline length of the battery module 1. In other words, the total length L0 of the battery module 1 is significantly greater than the width and thickness of the battery module 1, and the extension direction of the total length L0 of the battery module 1 is in the same direction as the first direction m. The outer shell has a predetermined outer edge width W1 and a predetermined inner wall width W2 along the second direction n, where W1 and W2 correspond to the size of the entire package. When the length direction of the first battery cell 101 and the length direction of the second battery cell 102 in the battery module 1 are parallel to the width direction of the outer shell, the extension direction corresponding to W1 is the direction of travel of the entire vehicle using this battery pack.

[0085] In this embodiment, L0 / W2=0.85-0.98, preferably, L0 / W2=0.97, wherein the length of the battery module 1 is 300-3000 mm, preferably 1173 mm, and W2=1210 mm.

[0086] Furthermore, the length of each first battery cell 101 or the second battery cell 102 is c (the length c here is the length excluding the poles at both ends), preferably, c>150mm, c is 350-1000mm, the thickness of each battery cell is a, the height or width of each battery cell is b, preferably, b≤160mm, and the total length of the battery cells included in each battery module 1 is L1, that is, L1=2c, preferably, L1 / W1=0.88-0.97, more preferably, in this embodiment, L1 / W1=0.95.

[0087] Furthermore, the battery pack also includes a connecting plate 15, which is arranged above the battery module 1 and the reinforcing beam 2. The connecting plate 15 is arranged facing the first battery cell 101 and the second battery cell 102 on both sides of the reinforcing beam 2. The top surface of each first battery cell 101 and the top surface of each second battery cell 102 are fixed to the connecting plate 15. The fixing method can be but is not limited to bonding. By fixing multiple first battery cells 101 and multiple second battery cells 102 at the same time through a connecting plate 15, the arrangement stiffness and connection strength of all battery cells on both sides of the reinforcing beam 2 can be improved, and the stiffness of the battery module 1 can also be improved, so that the constraint mode is greater than 500Hz.

[0088] Furthermore, the battery pack further includes an upper cover 16 , which is connected to the lower shell 10 to encapsulate the battery module 1 and the reinforcing beam 2 , etc. within the upper cover 16 and the lower shell 10 .

[0089] In addition, the battery pack also includes necessary components of the battery, such as BMS17 and BDU18. These necessary components are also arranged in the space defined by the upper cover 16 and the lower shell 10.

[0090] The battery pack provided by this application includes all the features and beneficial effects of the long cell module described above, and the same features and beneficial effects are not repeated here. The battery pack provided by this application fully utilizes the entire package space of this battery pack, significantly improving the battery pack's power and endurance, while also contributing to the battery pack's small size and lightweight design. It can also effectively protect and seal the battery cells, ensuring power while significantly improving safety.

[0091] An embodiment of the present application also provides a power device, including the long battery cell module and battery pack described in any of the above embodiments, and thus has all the beneficial technical effects of the long battery cell module and battery pack, which will not be repeated here.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A battery module, the battery module comprising a first battery cell and a second battery cell; The length of the first battery cell and the length of the second battery cell both extend along a first direction; A reinforcing beam, the first battery cell and the second battery cell are respectively connected to the reinforcing beam; an end portion of the reinforcing beam is provided with a fixing portion; A current collecting member is provided between the first battery cell and the second battery cell, and is connected to both the first battery cell and the second battery cell; the current collecting member comprises: a first connecting portion, the first connecting portion being connected to the first end output pole of the first battery cell; a second connecting portion, the second connecting portion being connected to the first end output pole of the second battery cell; and a third connecting portion, the first connecting portion and the second connecting portion being connected via the third connecting portion; the first connecting portion, the second connecting portion and the third connecting portion having an integral structure, the third connecting portion being arranged at an angle to the first connecting portion and the second connecting portion, so that the third connecting portion forms a bent structure between the first connecting portion and the second connecting portion; a housing comprising a lower housing, wherein the battery module and the reinforcing beam are both disposed within the lower housing; the reinforcing beam having a length greater than the total length of the battery modules arranged so that both ends of the reinforcing beam protrude relative to the first and last battery modules to form a first fixing portion and a second fixing portion, respectively; A fixed connector, the reinforcing beam and the lower shell are connected by the fixed connector; notches are formed at the bottoms of the first fixing portion and the second fixing portion, and the shape of the fixed connector is adapted to the shape of the inner wall surfaces of the first fixing portion and the second fixing portion, so that the fixed connector is disposed within the first fixing portion and the second fixing portion; The battery pack further includes a collecting component, wherein the first connecting portion is provided with the collecting component, and the collecting component is connected to the outer shell of the first battery cell; the second connecting portion is provided with another collecting component, and the collecting component is connected to the outer shell of the second battery cell; the collecting component is conductive and sheet-shaped; The battery pack also includes a first collecting component and a second collecting component. The first collecting component is arranged at an end of the first battery cell away from the reinforcing beam, and the second collecting component is arranged at an end of the second battery cell away from the reinforcing beam; the second collecting portion of the first collecting component is conductively connected to the collecting component, and the second collecting portion of the second collecting component is conductively connected to the collecting component.

2. The battery pack according to claim 1, wherein: There are multiple battery modules, and the multiple battery modules are arranged sequentially along the length direction of the reinforcing beam; The first battery cell of each battery module is arranged on one side of the reinforcing beam, and the second battery cell is arranged on the other side of the reinforcing beam.

3. The battery pack according to claim 1, wherein: The battery pack further includes: a first fastener, the fixing portion and the fixed connector being connected via the first fastener; A second fastener is used to connect the fixed connector to the lower shell.

4. The battery pack according to claim 1, wherein: The battery module has a length L0, the housing has a predetermined width W2 extending along the first direction, and L0 / W2=0.85-0.

98.

5. The battery pack according to claim 1, wherein: The battery pack further includes: a connecting plate, the connecting plate being arranged above the battery module, and each of the first battery cells and each of the second battery cells being connected to the connecting plate; A cold plate is disposed below the battery module.

6. A power device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 5.

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