High-strength battery pack

Abstract

The utility model relates to the technical field of battery packs, in particular to a high-strength battery pack which comprises a shell, a cross beam and multiple layers of battery modules, the cross beam and the multiple layers of battery modules are arranged in the shell, the multiple layers of battery modules are sequentially arranged in the height direction of the shell, and each layer of battery module comprises at least one battery cell assembly. The battery cell assembly comprises a plurality of blade battery cells which are sequentially arranged along a preset direction; in a preset direction, two ends of each layer of battery module are respectively provided with cross beams and are respectively connected with the two cross beams; a cross beam is also arranged in each layer of battery module; in the height direction of the shell, every two adjacent layers of cross beams are oppositely arranged and connected; and along the height direction of the shell, the cross beam arranged on the battery module at the lowest layer is connected with the bottom supporting plate of the shell. Therefore, the battery pack adopts a multi-layer blade cell structure, the volume utilization rate and the energy of the battery pack are improved, and the shell, the transverse and longitudinal beams, the top pressing plate and the bracket of the battery pack form a connecting net structure, so that the rigidity of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a high-strength battery pack. Background Art

[0002] At present, electric vehicles will encounter various complex working conditions during driving. In order to improve the ability of battery packs to cope with various working conditions, the structural strength of the battery pack must be improved to improve the overall safety performance of the battery pack. At present, most battery packs adopt a single-layer module structure, which has low space utilization and small energy. Therefore, it is necessary to design a battery pack structure with high volume utilization, large energy, and guaranteed rigidity. Utility Model Content

[0003] The purpose of the present application is to provide a high-strength battery pack, which to a certain extent solves the technical problem in the prior art that a battery pack structure with high volume utilization, large energy and guaranteed rigidity needs to be designed.

[0004] The present application provides a high-strength battery pack, comprising: a shell, a crossbeam and a multi-layer battery module arranged in the shell; wherein the multi-layer battery modules are arranged in sequence along the height direction of the shell, and each layer of battery modules includes at least one battery cell assembly, and any of the battery cell assemblies includes a plurality of blade batteries arranged in sequence along a preset direction;

[0005] Along the preset direction, cross beams are respectively provided at both ends of each layer of battery modules and are respectively connected to two of the cross beams; along the preset direction, cross beams are also provided between any two adjacent battery cell assemblies in each layer of battery modules; along the height direction of the shell, two adjacent layers of cross beams are relatively arranged and connected; along the height direction of the shell, the cross beams provided for the battery modules of the lowest layer are connected to the bottom support plate of the shell.

[0006] In the above technical solution, further, the high-strength battery pack also includes a top pressure plate. Along the height direction of the shell, the top pressure plate is pressed on the top of any of the battery cell assemblies in the uppermost battery module, and the top pressure plate is arranged between two adjacent beams, and the top pressure plate is connected to the matching beams.

[0007] In any of the above technical solutions, further, the top pressure plate and the matching crossbeam are detachably connected via a first fastening member.

[0008] In any of the above technical solutions, further, the high-strength battery pack also includes a bracket, which is arranged on the top of the top pressure plate and the topmost battery module, and the bracket is connected to the matching top pressure plate and the crossbeam.

[0009] In any of the above technical solutions, further, the bracket and the matching top pressure plate and the crossbeam are detachably connected through the same second fastening member.

[0010] In any of the above technical solutions, further, the bracket and the top pressure plate are staggered in a horizontal plane.

[0011] In any of the above technical solutions, further, the high-strength battery pack also includes an intermediate liquid cooling plate, and along the height direction of the shell, the intermediate liquid cooling plate is arranged between two adjacent layers of battery modules.

[0012] In any of the above technical solutions, further, the intermediate liquid cooling plate and the upper and lower battery cell assemblies adjacent thereto are bonded together by a heat-conductive structural adhesive.

[0013] In any of the above technical solutions, further, the crossbeam and the matching battery core assembly are bonded together by a heat-conductive structural adhesive.

[0014] In any of the above technical solutions, further, the high-strength battery pack also includes a longitudinal beam, and the longitudinal beam is arranged perpendicular to the cross beam; the longitudinal beam is arranged between any two adjacent cross beams in the bottom layer of cross beams.

[0015] In any of the above technical solutions, further, the high-strength battery pack also includes a bottom liquid cooling plate arranged inside the shell, and the bottom liquid cooling plate is connected to the bottom support plate of the shell; the battery cell assembly is arranged on the top of the bottom liquid cooling plate and is bonded together by a thermally conductive structural adhesive.

[0016] In any of the above technical solutions, further, the crossbeam is a profile.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] The high-strength battery pack provided by the present application adopts a multi-layer blade cell structure, which greatly improves the volume utilization rate of the battery pack and greatly improves the energy of the battery pack compared to a single-layer battery pack. In order to better support the multi-layer cell structure, multiple beams are designed, including end beams, namely end beams and middle beams, namely middle beams. The end beams and middle beams of the lowest layer are fixedly connected to the bottom support plate of the shell, and then the end beams of the upper layer are fixedly connected to the end beams of the adjacent lower layer. Similarly, the middle beams of the upper layer are fixedly connected to the middle beams of the lower layer. In order to further improve the rigidity of the battery pack, a top pressure plate is used on the top of the cell assembly to connect the cell assembly to the beam. In addition, the brackets such as the battery management module and the battery energy distribution module are connected to the beams, the top pressure plate and the end plates of the cell assembly. In this way, the lower shell, horizontal and longitudinal beams, brackets and top pressure plates of the battery pack form a connected mesh structure as a whole, which improves the rigidity of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. 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 paying any creative work.

[0020] Figure 1 A schematic diagram of a partial structure of a high-strength battery pack provided in an embodiment of the present application;

[0021] Figure 2 An assembly diagram of a shell and transverse and longitudinal beams provided in an embodiment of the present application;

[0022] Figure 3 Another assembly diagram of the housing and the transverse and longitudinal beams provided in the embodiment of the present application;

[0023] Figure 4 An assembly diagram of the housing, transverse and longitudinal beams, and intermediate liquid cooling plate provided in an embodiment of the present application;

[0024] Figure 5 Another partial schematic diagram of a high-strength battery pack provided by an embodiment of the present application;

[0025] Figure 6 Another partial schematic diagram of a high-strength battery pack provided by an embodiment of the present application;

[0026] Figure 7 for Figure 6 Cross-sectional view along section AA;

[0027] Figure 8 for Figure 6 Cross-sectional view along section BB.

[0028] Reference numerals:

[0029] 1-shell, 2-cross beam, 3-top pressure plate, 4-bracket, 5-intermediate liquid cooling plate, 6-longitudinal beam, 7-battery cell assembly, 71-battery cell, 8-first fastening member, 9-second fastening member. DETAILED DESCRIPTION

[0030] 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 of the embodiments.

[0031] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various 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 application claimed, but merely represents the selected embodiments of the present application.

[0032] 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.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Refer to the following Figures 1 to 8 A high-strength battery pack according to some embodiments of the present application is described.

[0036] See also Figures 1 to 5As shown, an embodiment of the present application provides a high-strength battery pack, comprising: a shell 1, a crossbeam 2 and a multi-layer battery module arranged in the shell 1; wherein the multi-layer battery modules are arranged in sequence along the height direction of the shell 1, and each layer of battery modules includes at least one battery cell assembly 7, and any battery cell assembly 7 includes a plurality of blade batteries 71 arranged in sequence along a preset direction;

[0037] Along the preset direction, cross beams 2 are respectively provided at both ends of each layer of battery modules, and are respectively connected to two cross beams 2; along the preset direction, cross beams 2 are also provided between any two adjacent battery cell assemblies 7 in each layer of battery modules; along the height direction of the shell 1, two adjacent layers of cross beams 2 are relatively arranged and connected; along the height direction of the shell 1, the cross beams 2 provided for the battery modules of the lowest layer are connected to the bottom support plate of the shell 1.

[0038] According to the structure described above, the high-strength battery pack provided by the present application adopts a multi-layer blade cell structure, which greatly improves the volume utilization rate of the battery pack and greatly improves the energy of the battery pack compared to a single-layer battery pack. In order to better support the multi-layer cell structure, multiple beams 2 are designed, including end beams 2, i.e., end beams and middle beams 2, i.e., middle beams. The end beams and middle beams of the lowest layer are fixedly connected to the bottom support plate of the shell 1, and then the end beams of the upper layer are fixedly connected to the adjacent end beams of the lower layer. Similarly, the middle beams of the upper layer are fixedly connected to the middle beams of the lower layer to form an overall support frame. On this basis, the end plates of the cell assembly 7 are fixedly connected to the adjacent end beams and middle beams to form an assembly, thereby greatly improving the rigidity of the battery pack.

[0039] In this embodiment, preferably, Figure 1 and Figure 5 As shown, the high-strength battery pack also includes a top pressure plate 3. Along the height direction of the shell 1, a top pressure plate 3 is pressed on the top of any battery cell assembly 7 in the uppermost battery module, and the top pressure plate 3 is arranged between two adjacent beams 2, and the top pressure plate 3 is connected to the matching beams 2.

[0040] According to the structure described above, the top pressure plate 3 is used to fix the end beams and the middle beams of the top layer together, and along the height direction of the shell 1, the two adjacent layers of end beams are fixed together, the two adjacent layers of middle beams are fixed together, and the end beams and the middle beams of the bottom layer are also connected to the bottom support plate of the shell 1, thereby forming a connected network structure, which greatly improves the rigidity of the battery pack.

[0041] In this embodiment, preferably, Figure 1 and Figure 5As shown, the top pressure plate 3 and the matching cross beam 2 are detachably connected via a first fastening member 8, that is, each top pressure plate 3 and the two end plates at both ends of the battery cell assembly 7 thereunder and the two cross beams 2 at both ends of the battery cell assembly 7 are detachably connected via a first fastening member 8 such as screws or bolts, which is a reliable and stable fixing method and is detachable, which is particularly convenient for later replacement or maintenance operations. Of course, the present invention is not limited to this. The top pressure plate 3 and the top of the end plate of the matching battery cell assembly 7 and the cross beam 2 may also be connected via other methods, such as clamping or welding, etc., which may be selected according to actual needs.

[0042] In this embodiment, preferably, Figure 1 and Figure 5 As shown, the high-strength battery pack also includes a bracket 4, which is arranged on the top of the top pressure plate 3 and the topmost battery module, and the bracket 4 is respectively connected to the matching top pressure plate 3 and the crossbeam 2.

[0043] According to the structure described above, it can be seen that the bracket 4 is integrated on the top of the topmost battery module to improve the volume utilization, and the bracket 4 can also be connected to the top pressure plate 3 and the cross beam 2, which can provide better support for the bracket 4, and this bracket 4 can be used to support the battery management module and / or the battery energy distribution module.

[0044] In this embodiment, preferably, Figure 1 and Figure 5 As shown, the bracket 4 and the matching top platen 3 and the cross beam 2 are detachably connected through the same second fastening member 9, that is, the connection point between the bracket 4 and the matching top platen 3 and the connection point between the bracket 4 and the cross beam 2 coincide with each other, that is, the bracket 4 and the matching top platen 3 and the cross beam 2 share the same connection point. It can be seen that the reprocessing of the connection point is avoided, the production efficiency is improved, the investment in parts and components can be reduced, and the cost is reduced. It should be noted that the connection method between the bracket 4 and the matching top platen 3 and the cross beam 2 is not limited to the above, for example, it can also be connected by welding or clamping, etc., which can be selected according to actual needs.

[0045] In this embodiment, preferably, Figure 1 and Figure 5 As shown, the bracket 4 and the top pressure plate 3 are staggered in the horizontal plane, and preferably partially staggered, and the overlapping portion is used to install the aforementioned second fastening member 9. It can be seen that the top pressure plate 3 and the bracket 4 are criss-cross connected. Such a structural design enables the battery pack to form a criss-cross woven mesh structure, thereby improving the rigidity of the battery pack.

[0046] In this embodiment, preferably, Figure 4As shown, the high-strength battery pack further includes an intermediate liquid cooling plate 5 , and along the height direction of the shell 1 , an intermediate liquid cooling plate 5 is disposed between two adjacent layers of battery modules.

[0047] According to the structure described above, it can be seen that the middle area of ​​the multi-layer battery module is cooled by the middle liquid cooling plate 5 to improve the overall performance of the battery pack.

[0048] In this embodiment, preferably, the middle liquid cooling plate 5 and the adjacent upper and lower battery cell assemblies 7 are bonded together by a heat-conductive structural adhesive.

[0049] According to the structure described above, it can be seen that bonding the upper and lower battery cell assemblies 7 with the intermediate liquid cooling plate 5 therebetween can improve the overall rigidity and strength, and improve the overall firmness and stability of the battery pack.

[0050] In this embodiment, preferably, the cross beam 2 and the matching battery cell assembly 7 are bonded together by thermally conductive structural adhesive, that is, the battery cells 71 at both ends of the battery cell assembly 7 are respectively bonded to the adjacent cross beams 2 by thermally conductive structural adhesive, which is a reliable and stable fixing method.

[0051] In this embodiment, preferably, Figure 2 and Figure 3 As shown, the high-strength battery pack further includes a longitudinal beam 6 , and the longitudinal beam 6 is arranged perpendicular to the cross beam 2 ; a longitudinal beam 6 is arranged between any two adjacent cross beams 2 in the bottom layer of cross beams 2 .

[0052] According to the structure described above, the longitudinal beam 6 can be used to connect the two adjacent cross beams 2 at the bottom layer together. In addition, along the height direction of the shell 1, any two adjacent layers of cross beams 2 are connected together, thereby further forming an overall supporting frame. In addition, the longitudinal beam 6 also plays a role in structural reinforcement.

[0053] It should be noted that: the longitudinal beam 6 is not limited to being designed at the bottom layer, but can also be designed at each layer, and the specific design is based on actual needs.

[0054] Furthermore, preferably, the outside of the longitudinal beam 6 can be coated with an insulating layer such as a mica layer. Since the explosion-proof valve and the pole of the blade battery 71 are arranged close to the longitudinal beam 6, conduction can be avoided and a mica layer can be wrapped on the longitudinal beam 6. Of course, this is not limited to this. When the blade battery 71 is located in other positions, that is, the explosion-proof valve and the pole of the blade battery 71 are not close to the longitudinal beam 6, the outside of the longitudinal beam 6 may not be coated with an insulating layer.

[0055] In this embodiment, preferably, the high-strength battery pack also includes a bottom liquid cooling plate (not shown in the figure) arranged inside the shell 1, and the bottom liquid cooling plate is connected to the bottom support plate of the shell 1; the battery cell assembly 7 is arranged on the top of the bottom liquid cooling plate and is bonded together by a thermally conductive structural adhesive.

[0056] According to the structure described above, the bottom liquid cooling plate plays a role in cooling the battery module at the bottom layer, and the battery cell assembly 7 can be bonded together with the bottom liquid cooling plate to form an integral structure, which plays a role in reinforcement.

[0057] Further, preferably, the bottom liquid cooling plate and the bottom support plate of the shell 1 can be connected by fastening components such as screws or bolts. Of course, it is not limited to this, and they can also be connected by welding or clamping, etc., depending on the actual needs.

[0058] In this embodiment, preferably, Figures 6 to 8 As shown, the beam 2 extends in a direction parallel to the large surface of the blade battery cell 71 , that is, the length direction of the beam 2 is the same as the length direction of the blade battery cell 71 , and is perpendicular to the aforementioned preset direction, that is, the arrangement direction of the blade battery cell 71 .

[0059] In this embodiment, preferably, Figure 1 As shown, there are two layers of battery modules, and each layer of battery modules includes four battery cell assemblies 7, that is, four battery cell assemblies 7 are arranged on the top layer, and four battery cell assemblies 7 are arranged on the bottom layer, and a top pressure plate 3 is provided on the top of each of the four battery cell assemblies 7 on the top layer, that is, there are four top pressure plates 3 in total.

[0060] Further, preferably, the plurality of battery cell assemblies 7 in each layer of battery modules are arranged in a square array along the X direction and the Y direction. Of course, this is not limited to this and can also be designed according to actual needs.

[0061] In this embodiment, preferably, Figure 2 As shown, the shell 1 may preferably be a lower shell 1, which is a structure that is hollow inside and open at the top, and preferably, the high-strength battery pack also includes an upper shell 1, which is a structure that is hollow inside and open at the bottom, and the upper shell 1 and the lower shell 1 can be snapped together, and preferably, can be connected by at least one of bolts, clamping and welding.

[0062] It should be noted that the above is only an example and is not limited to two layers of battery modules. The number of layers can also be greater than two, for example, it can also be a three-layer battery module, a four-layer battery module or a five-layer battery module, etc., which is designed according to actual needs. In addition, the number of battery cell assemblies 7 included in each layer of battery modules is not limited to four. The number of battery cell assemblies 7 included in each layer of battery modules is less than four, such as one, two or three. The number of battery cell assemblies 7 included in each layer of battery modules can also be greater than four, such as five, six, seven, eight, etc., which is designed according to actual needs.

[0063] In this embodiment, preferably, Figure 7 As shown, the cross beam 2 is a profile structure that is hollow inside and provided with reinforcing ribs, which ensures strength and rigidity while being light in weight. Reducing the weight of the battery pack contributes to lightweight design, but of course, it is not limited to this.

[0064] Further, the longitudinal beam 6 can also be a hollow profile structure. Of course, it is not limited to this.

[0065] 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 it. 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-strength battery pack, characterized in that: include: A shell and a crossbeam and a multi-layer battery module arranged in the shell; wherein the multi-layer battery modules are arranged in sequence along the height direction of the shell, and each layer of battery modules includes at least one battery cell assembly, and any of the battery cell assemblies includes a plurality of blade batteries arranged in sequence along a preset direction; Along the preset direction, cross beams are respectively provided at both ends of each layer of battery modules and are respectively connected to two of the cross beams; along the preset direction, cross beams are also provided between any two adjacent battery cell assemblies in each layer of battery modules; along the height direction of the shell, two adjacent layers of cross beams are relatively arranged and connected; along the height direction of the shell, the cross beams provided for the battery modules of the lowest layer are connected to the bottom support plate of the shell.

2. The high-strength battery pack according to claim 1, characterized in that: The high-strength battery pack also includes a top pressure plate. Along the height direction of the shell, the top pressure plate is pressed on the top of any of the battery cell assemblies in the uppermost battery module, and the top pressure plate is arranged between two adjacent beams, and the top pressure plate is connected to the matching beams.

3. The high-strength battery pack according to claim 2, characterized in that: The top pressing plate and the matching cross beam are detachably connected via a first fastening member.

4. The high-strength battery pack according to claim 2, characterized in that: The high-strength battery pack also includes a bracket, which is arranged on the top of the top pressure plate and the topmost battery module, and the bracket is connected to the matching top pressure plate and the crossbeam.

5. The high-strength battery pack according to claim 4, characterized in that: The bracket is detachably connected with the matched top pressure plate and the cross beam through the same second fastening member.

6. The high-strength battery pack according to claim 4, characterized in that: The brackets and the top pressing plates are arranged alternately in a horizontal plane.

7. The high-strength battery pack according to claim 1, characterized in that: The high-strength battery pack further includes an intermediate liquid cooling plate, and the intermediate liquid cooling plate is disposed between two adjacent layers of battery modules along the height direction of the shell.

8. The high-strength battery pack according to claim 7, characterized in that: The intermediate liquid cooling plate and the adjacent upper and lower battery core components are bonded together by heat-conducting structural adhesive.

9. The high-strength battery pack according to claim 1, characterized in that: The crossbeam and the corresponding battery core assembly are bonded together by heat-conducting structural adhesive; and / or The high-strength battery pack further comprises a longitudinal beam, and the longitudinal beam is arranged perpendicularly to the cross beam; the longitudinal beam is arranged between any two adjacent cross beams in the bottom layer of cross beams.

10. The high-strength battery pack according to any one of claims 1 to 9, characterized in that: The high-strength battery pack further comprises a bottom liquid cooling plate disposed inside the shell, and the bottom liquid cooling plate is connected to the bottom support plate of the shell; the battery cell assembly is disposed on the top of the bottom liquid cooling plate and is bonded together by a heat-conducting structural adhesive; and / or The crossbeam is a profile.

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