Battery module

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module which comprises a shell and a top cover, an opening is formed in the top of the shell, and the top cover covers the top opening of the shell in a sealing mode; the top cover and the shell are made of different materials, and the strength of the top cover is larger than that of the shell. In the battery module provided by the invention, the shell and the top cover are made of materials with different strengths, and the strength of the top cover is greater than that of the shell, so that the top cover has enough strength to support the battery management module at the top and avoid deformation of the top cover, and the shell can be made of a material with a slightly smaller strength, so that the battery management module can be conveniently assembled while the strength requirement is met. On the basis, the shell and the top cover can be made of different types of aluminum alloy, the shell is preferably made of 5-series aluminum alloy plates to be bent, the top cover is preferably made of 6-series aluminum alloy sections, the shell and the top cover are connected through fasteners, and the formed shell assembly has high strength.

Description

Technical Field

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

[0002] At present, with the extensive use of motor vehicles (especially RVs), the demand for vehicle-mounted batteries has increased significantly. Their main function is to serve as backup power in daily life. The current vehicle-mounted batteries include a shell, a top cover and a battery pack. The battery pack is arranged in the shell, and the top cover is arranged at the top opening of the shell. The upper surface of the top cover is often integrated with a battery management module, namely a BMS module, etc., which requires higher strength, while the strength requirement of the shell is lower. However, the shell and top cover of the current vehicle-mounted batteries often use the same material, resulting in the same strength, that is, they cannot meet the actual strength requirements of different parts. In other words, if high-strength materials are used at the same time, the cost will be greatly increased. If low-strength materials are used at the same time, the top cover will be prone to deformation and other defects. Utility Model Content

[0003] The purpose of the present application is to provide a battery module, which to some extent solves the technical problem in the prior art that the outer shell and top cover of the vehicle-mounted battery are often made of the same material, resulting in the same strength, that is, they cannot meet the actual strength requirements of different parts.

[0004] The present application provides a battery module, comprising: a shell and a top cover; wherein an opening is formed at the top of the shell, and the top cover is sealed at the top opening of the shell; the material of the top cover is different from that of the shell, and the strength of the top cover is greater than that of the shell.

[0005] In the above technical solution, further, the shell is made of aluminum alloy or steel.

[0006] In any of the above technical solutions, further, when the material of the shell is aluminum alloy, the material is 5 series aluminum alloy or 3 series aluminum alloy.

[0007] In any of the above technical solutions, further, the shell is a sheet metal bent part.

[0008] In any of the above technical solutions, further, the material of the top cover is aluminum alloy or steel.

[0009] In any of the above technical solutions, further, when the material of the top cover is aluminum alloy, the material is 6 series aluminum alloy.

[0010] In any of the above technical solutions, further, the top cover is a profile part or a die-casting part.

[0011] In any of the above technical solutions, further, the battery module also includes a battery pack, the battery pack includes a plurality of battery cells, and the plurality of battery cells are stacked together in sequence along a first direction.

[0012] In any of the above technical solutions, further, the shell includes a bottom plate and two side plates, and the two side plates are respectively arranged on both sides of the bottom plate; along the first direction, the two side plates are respectively against the large surface sides of the two battery cells located at the edge.

[0013] In any of the above technical solutions, further, the battery module also includes a buffer pad, and the buffer pad is arranged between each or more of the battery cells, and / or the buffer pad is arranged on a large surface of at least one side of the battery pack along a direction perpendicular to the first direction.

[0014] In any of the above technical solutions, further, the buffer pad inside the battery pack is fixedly connected to the adjacent battery cells by gluing.

[0015] In any of the above technical solutions, further, the buffer pads on the two major surface sides of the battery pack are fixedly connected to the shell and the adjacent battery cells by gluing.

[0016] In any of the above technical solutions, further, in the first direction, the thickness of the battery pack and the buffer pad is greater than or equal to the width of the inner cavity of the shell.

[0017] In any of the above technical solutions, further, the battery module also includes a bracket, the bracket is formed with a via, and the tabs of the battery pack are inserted into the via.

[0018] In any of the above technical solutions, further, the battery module also includes a conductive bar, and the conductive bar is arranged on a side of the bracket away from the battery cell, and the electrode tab is connected to the conductive bar.

[0019] In any of the above technical solutions, further, one of the conductive row and the bracket is formed with a first positioning portion, the other of the conductive row and the bracket is formed with a first positioning hole, and the first positioning portion is inserted into the first positioning hole.

[0020] In any of the above technical solutions, further, the bracket is formed with an isolation portion arranged on the side of the conductive bar.

[0021] In any of the above technical solutions, further, the battery module also includes a temperature sensor, which is arranged on a side of the bracket close to the battery cell and is used to collect the temperature of the battery cell;

[0022] The battery module further comprises a circuit board, and the circuit board and the conductive bar are located on the same side of the bracket, and the circuit board is connected to the conductive bar and the temperature sensor;

[0023] A second positioning portion is formed on one of the circuit board and the bracket, a second positioning hole is formed on the other of the circuit board and the bracket, and the second positioning portion is inserted into the second positioning hole.

[0024] In any of the above technical solutions, further, one of the bracket and the shell is formed with a third positioning portion, the other of the bracket and the shell is formed with a third positioning hole or positioning groove, and the third positioning portion is inserted into the third positioning hole or positioning groove.

[0025] In any of the above technical solutions, further, the bracket and the shell are detachably connected via a first fastening member.

[0026] In any of the above technical solutions, further, the battery module also includes an isolation protection cover, and the isolation protection cover is provided on a side of the bracket away from the battery cell and is used to cover the tab.

[0027] In any of the above technical solutions, further, the battery module also includes a heating device, and the heating device is arranged at the top or bottom of the battery module along its height direction.

[0028] In any of the above technical solutions, further, the heating device is connected to the battery pack by gluing.

[0029] In any of the above technical solutions, further, a heat insulation component is provided between the heating device and the top cover or the bottom of the shell.

[0030] In any of the above technical solutions, further, the top cover is U-shaped, and two sides of the top cover are respectively against two inner side walls of the shell, and are detachably connected via a second fastening member.

[0031] In any of the above technical solutions, further, the inner wall surfaces of the shell and the top cover are both provided with an insulating film or a coating.

[0032] In any of the above technical solutions, further, studs are formed on the upper surface of the top cover.

[0033] In any of the above technical solutions, further, the battery module also includes a battery management module, and the battery management module is arranged on the upper surface of the top cover.

[0034] Compared with the prior art, the beneficial effects of this application are:

[0035] The battery module provided in this application has the following structure and advantages:

[0036] In the battery module provided in the present application, the shell and the top cover are made of materials with different strengths, and the strength of the top cover is greater than that of the shell, so that the top cover has sufficient strength to support the battery management module on the top to avoid deformation of the top cover, while the shell can be made of a material with slightly lower strength to reduce costs while meeting the strength requirements. Preferably, the shell and the top cover are both made of aluminum alloy, which has high strength, can resist the expansion of the battery cell, and is lighter. Preferably, the shell and the top cover are made of different types of aluminum alloys: the shell is made of a bent 5 series aluminum alloy sheet, and the top cover is made of a 6 series aluminum alloy profile. The two are connected with fasteners, and the formed shell assembly has high strength.

[0037] The module has a small size, high grouping rate, and saves weight and space. By utilizing the cooperation between the shell and the top cover, in the thickness direction, in addition to the battery cells, the first buffer pad and the second buffer pad, there are only two layers of aluminum plates, i.e. the thickness of the two side plates, which is more compact and smaller in size than the common end plate solution. In addition, the U-shaped design on the top cover allows the connection position between the shell and the top cover to overlap with the installation position of the BMS module, i.e. the battery management module, in the vertical direction, saving space.

[0038] The first buffer pad and the second buffer pad can absorb the expansion of the battery cell, reduce the risk, and facilitate the operation of inserting the battery pack into the shell;

[0039] The cooperation between the shell, top cover and buffer pad can provide appropriate and uniform pressure throughout the life cycle of the battery cell, thereby extending its life.

[0040] After the module is assembled, it has good integrity and high structural strength, which is conducive to transportation and storage during production; the top cover has high strength and a relatively flat surface, which is convenient for the installation of subsequent components and the use of various lifting tools, especially suction cups.

[0041] The integrated heating device can heat the battery in a low-temperature environment and during charging and discharging, thereby improving charging and discharging conditions and extending the battery life. The space between the heating device and the top cover is filled with resilient insulating foam, i.e., an insulating component, which can ensure that the heating film and the battery cell fit fully and reduce heat dissipation from the top cover to the outside.

[0042] The integrated BMS (Battery Management System) module is the battery management module. The voltage signal and temperature signal of the battery pack are output to the battery management module through the circuit board and the acquisition signal line, so as to realize the control strategy of the battery under different temperatures, different charging and discharging conditions and so on.

[0043] The inner surface of the top cover and the shell are covered with insulating film, which can meet the safety requirements of various electrical appliances.

[0044] The battery cells, the battery pack and the shell, and the heating device and the battery cells are all bonded with thermally conductive adhesive, which is beneficial to heat dissipation.

[0045] The structure of this battery module has a certain degree of maintainability, which is convenient for subsequent operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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.

[0047] Figure 1 An exploded schematic diagram of a battery module provided in an embodiment of the present application (the isolation protective cover is not shown);

[0048] Figure 2 An assembly diagram of a battery module provided in an embodiment of the present application;

[0049] Figure 3 Another assembly diagram of a battery module provided in an embodiment of the present application;

[0050] Figure 4 for Figure 3 Cross-sectional view along section AA;

[0051] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at B;

[0052] Figure 6 A schematic diagram of a partial structure of a battery module provided in an embodiment of the present application;

[0053] Figure 7 A schematic diagram of the structure of the top cover provided in the embodiment of the present application;

[0054] Figure 8 A schematic diagram of the structure of a housing provided in an embodiment of the present application;

[0055] Fig. 9 An assembly diagram of the shell and the top cover provided in an embodiment of the present application.

[0056] Reference numerals:

[0057] 1-shell, 101-bottom plate, 102-side plate, 2-top cover, 21-stud, 3-battery pack, 31-battery cell, 4-first buffer pad, 5-second buffer pad, 6-bracket, 61-first positioning portion, 62-second positioning portion, 63-isolating portion, 7-conductive bar, 8-circuit board, 9-isolating protective cover, 10-heating device, 11-heating member, 12-second fastening member. DETAILED DESCRIPTION

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] Refer to the following Figures 1 to 9 A battery module according to some embodiments of the present application is described.

[0064] See also Figure 1 and Figure 2As shown, an embodiment of the present application provides a battery module, comprising: a shell 1 and a top cover 2; wherein an opening is formed at the top of the shell 1, and the top cover 2 is sealed at the top opening of the shell 1; the material of the top cover 2 is different from that of the shell 1, and the strength of the top cover 2 is greater than that of the shell 1.

[0065] Based on the structure described above, it can be known that the shell 1 and the top cover 2 are made of materials with different strengths, and the strength of the top cover 2 is made greater than the strength of the shell 1, so that the top cover 2 has sufficient strength to support the battery management module on the top to avoid deformation of the top cover 2, while the shell 1 can choose a material with slightly lower strength to reduce costs while meeting the strength requirements.

[0066] In this embodiment, preferably, Figure 1 and Figure 2 As shown, the material of the shell 1 is 5 series aluminum alloy; the material of the top cover 2 is 6 series aluminum alloy.

[0067] According to the structure described above, the strength of 6 series aluminum alloy is higher than that of 5 series aluminum alloy, so the top cover 2 has sufficient strength to support the battery management module on its top, while the strength of the shell 1 is slightly smaller, which helps to reduce costs while meeting the strength requirements. In addition, the aluminum alloy material is light in weight, which helps with lightweight design.

[0068] Furthermore, the shell 1 is a bent part formed by bending; the top cover 2 is a profile structure formed by extrusion or a die-casting part.

[0069] Of course, the materials of the shell 1 and the top cover 2 are not limited to the above, and both may be made of steel, or one of them may be made of steel and the other may be made of aluminum. For example, the top cover 2 may be made of aluminum and the shell 1 may be made of steel, or the top cover 2 may be made of steel and the shell 1 may be made of aluminum, or both may be made of aluminum alloy. Both may be freely selected from 1 series, 2 series, 3 series, 4 series, 5 series and 6 series aluminum alloys, but the strength of the material of the top cover 2 must be greater than the strength of the material of the shell 1. Of course, other series of aluminum alloys may also be selected, depending on actual needs.

[0070] In this embodiment, preferably, Figure 1 , Figure 3 and Figure 4 As shown, the battery module further includes a battery pack 3, the battery pack 3 includes a plurality of battery cells 31, and the plurality of battery cells 31 are stacked together in sequence along a first direction;

[0071] Further, preferably, the shell 1 includes a bottom plate 101 and two side plates 102, and the two side plates 102 are respectively arranged on both sides of the bottom plate 101; along the first direction, the two side plates 102 respectively abut against the large surface sides of the two battery cells 31 located at the edge (the large surface of the battery cell 31 refers to the surface formed by its length direction and height direction, and expansion and deformation mainly occur at this position).

[0072] According to the structure described above, the two side plates 102 can effectively resist the expansion and deformation of the large surface of the battery cell 31, thereby improving the safety and reliability of the battery.

[0073] In this embodiment, preferably, Figure 4 As shown, the battery module also includes a buffer pad, and a buffer pad is arranged between every four battery cells 31. For the purpose of distinction, it is named as the first buffer pad 4 here. Of course, it is not limited to this. Each one, two, three or five, six, that is, more than four battery cells 31 can be a group and a first buffer pad 4 can be arranged between them.

[0074] According to the structure described above, the first buffer pad 4 arranged inside the battery pack 3 can effectively absorb the expansion of the battery cell 31 and reduce the risk. In addition, the first buffer pad 4 has a certain amount of shrinkage, which is convenient for the operation of inserting the battery pack 3 into the shell as a whole, and ensures that it can be abutted against the inner wall of the shell 1 after entering the shell, so that the overall structure is more stable and more reliable.

[0075] Furthermore, preferably, the first buffer pad 4 inside the battery pack 3 is connected to the adjacent battery cells 31 by gluing, so that the overall structure is stronger and more stable.

[0076] Further, preferably, the first buffer pad 4 is foam.

[0077] In this embodiment, preferably, Figure 4 As shown, along a direction perpendicular to the first direction, a buffer pad is also provided on a large surface of at least one side of the battery pack 3 , which is named as a second buffer pad 5 for distinction.

[0078] According to the structure described above, in addition to arranging buffer pads inside the battery pack 3, buffer pads are also arranged on the large surfaces on both sides of the battery pack 3 as a whole, which also play the role of absorbing the expansion of the battery cell 31 and facilitating assembly.

[0079] Furthermore, preferably, the second buffer pads 5 on the two major surfaces of the battery pack 3 are connected to the shell 1 and the adjacent battery cells 31 by gluing, so that the overall structure is stronger and more stable, and preferably, the glue selected is a high-strength thermal conductive glue, which helps to dissipate heat.

[0080] Further, preferably, the second buffer pad 5 is foam.

[0081] In this embodiment, preferably, in the first direction, the thickness of the battery pack 3, the first buffer pad 4 and the second buffer pad 5 is greater than or equal to the width of the inner cavity of the shell 1, so that after the battery pack 3 is inserted into the shell, it can be ensured to be tightly against the inner wall of the shell 1, thereby improving the firmness and stability of the overall structure.

[0082] In this embodiment, preferably, Figure 6 As shown, the battery module further includes a bracket 6, which is formed with a via hole, and the tabs of the battery pack 3 are inserted into the via hole.

[0083] Further, preferably, Figure 6 As shown, the battery module further includes a conductive bar 7 , and the conductive bar 7 is disposed on a side of the bracket 6 away from the battery cell 31 , and the tab is connected to the conductive bar 7 .

[0084] According to the structure described above, the bracket 6 plays the role of fixing the pole ear and supporting the conductive bar 7 and the temperature sensor and circuit board 8 described below.

[0085] In this embodiment, preferably, Figure 6 As shown, one of the conductive bar 7 and the bracket 6 is formed with a first positioning portion 61 , and the other of the conductive bar 7 and the bracket 6 is formed with a first positioning hole, and the first positioning portion 61 is inserted into the first positioning hole.

[0086] According to the structure described above, the conductive bar 7 and the bracket 6 can be quickly assembled and positioned by the cooperation between the first positioning portion 61 and the first positioning hole.

[0087] Further, preferably, the first positioning portion 61 is a positioning column, and the cross-sectional dimension of the positioning column perpendicular to its height direction is smaller than that of the first positioning hole, so as to facilitate assembly.

[0088] Furthermore, preferably, the first positioning portion 61 is higher than the hole depth of the first positioning hole, and the top end of the first positioning portion 61 can extend to the side of the first positioning hole away from the battery pack 3, that is, beyond the side of the conductive bar 7 away from the battery pack 3. After the assembly is completed, the excess part of the structure is melted away by hot melting, thereby forming a limiting portion to limit the side of the conductive bar 7 away from the battery pack 3.

[0089] In this embodiment, preferably, the battery module further includes a temperature sensor (not shown in the figure), and is disposed on a side of the bracket 6 close to the battery cell 31 .

[0090] According to the structure described above, it can be known that the temperature sensor can monitor the temperature of the battery cell 31 at all times, that is, obtain the thermal characteristics of the battery cell 31, and improve the safety and reliability of the battery module during use.

[0091] In this embodiment, preferably, Figure 6 As shown, the battery module further includes a circuit board 8, and is located on the same side of the bracket 6 as the conductive bar 7. The circuit board 8 is connected to the conductive bar 7 and the temperature sensor.

[0092] According to the structure described above, the circuit board 8 can obtain the power characteristics and temperature characteristics of all or part of the battery cells 31, and output them to the battery management module etc. through the external terminals.

[0093] Further, preferably, the circuit board 8 and the conductive bar 7 may be connected via a voltage collection metal sheet.

[0094] Further, preferably, the bracket 6 is formed with an isolation portion 63 arranged on the side of the conductive bar 7 and is higher than the conductive bar 7, which plays a blocking role to avoid overlapping and short-circuiting when there are multiple conductive bars 7, and preferably, the isolation portion 63 is plate-shaped.

[0095] In this embodiment, preferably, Figure 6 As shown, one of the circuit board 8 and the bracket 6 is formed with a second positioning portion 62 , and the other of the circuit board 8 and the bracket 6 is formed with a second positioning hole, and the second positioning portion 62 is inserted into the second positioning hole.

[0096] It can be known from the structure described above that the circuit board 8 and the bracket 6 can be quickly assembled and positioned through the cooperation between the second positioning portion 62 and the second positioning hole.

[0097] Further, preferably, the second positioning portion 62 is a positioning column, and the cross-sectional dimension of the positioning column perpendicular to its height direction is smaller than that of the second positioning hole, so as to facilitate assembly.

[0098] Furthermore, preferably, the second positioning portion 62 is higher than the hole depth of the second positioning hole, and the top end of the second positioning portion 62 can extend to the side of the second positioning hole away from the battery pack 3, that is, beyond the side of the conductive bar 7 away from the battery pack 3. After the assembly is completed, the excess part of the structure is melted away by hot melting, thereby forming a limit portion to limit the side of the conductive bar 7 away from the battery pack 3.

[0099] In this embodiment, preferably, one of the bracket 6 and the shell 1 is formed with a third positioning portion, the other of the bracket 6 and the shell 1 is formed with a third positioning hole or positioning groove, and the third positioning portion is inserted into the third positioning hole or positioning groove (not shown in the figure).

[0100] According to the structure described above, the bracket 6 and the housing 1 can be quickly assembled and positioned by the cooperation between the third positioning portion and the third positioning hole or the positioning groove.

[0101] Further, preferably, the third positioning portion has a protrusion with a height of 0.5 mm to 3 mm, and a slightly larger opening or recess is set at a corresponding position on the shell 1. After assembly, the protrusion and the opening or recess cooperate with each other, so that the bracket 6 and the shell 1 cooperate with each other.

[0102] In this embodiment, preferably, the bracket 6 and the shell 1 are detachably connected via a first fastening member such as a screw or a bolt (not shown in the figure), which is a detachable connection structure and is convenient for subsequent operation and maintenance.

[0103] In this embodiment, preferably, Figure 2 As shown, the battery module further includes an isolation protection cover 9, and the isolation protection cover 9 is disposed on a side of the bracket 6 away from the battery cell 31 and is used to cover the tab.

[0104] According to the structure described above, the isolation protection cover 9 protects the tabs to avoid the risk of short circuit, and preferably, the isolation protection cover 9 is made of insulating material, such as plastic.

[0105] In this embodiment, preferably, Figure 5 As shown, the battery module further includes a heating device 10, and the heating device 10 is arranged at the top or bottom of the battery pack 3 along its height direction.

[0106] According to the structure described above, it can be known that in a low temperature environment and during charging and discharging, the heating device 10 can heat the battery, improve the charging and discharging conditions, and extend the battery life.

[0107] In this embodiment, preferably, Figure 5 As shown, the heating device 10 is connected to the battery pack 3 by gluing, and further, preferably, a heat-insulating component 11 is provided between the heating device 10 and the top cover 2 or the bottom of the shell 1, and preferably, the heat-insulating component 11 is a heat-insulating foam. Of course, it is not limited to this, and it can also be a heat-insulating rubber pad, etc.

[0108] According to the structure described above, the space between the heating device 10 and the top cover 2 is filled with thermal insulation foam with resilience, which can make the heating device 10 and the battery cell 31 fit fully and reduce the heat dissipation from the top cover 2 to the outside. In addition, the heating device 10, the thermal insulation foam and the battery cell 31 are bonded together by gluing, and the overall structure is stronger and more stable.

[0109] Further, preferably, the heating device 10 is a heating film, and extends along the length direction of the battery core 31 .

[0110] In this embodiment, preferably, Figures 7 to 9 As shown, the top cover 2 is U-shaped, and two sides of the top cover 2 are respectively against two inner side walls of the shell 1 and are detachably connected via a second fastening member 12 .

[0111] According to the structure described above, the top cover 2 is designed to be U-shaped, with its two side portions extending in the vertical direction, and abutting against the two side walls of the shell 1 extending in the vertical direction, that is, the inner walls of the two side guard plates, and the abutting portions are fastened by a horizontally arranged second fastening member 12 such as screws or bolts. It can be seen that the connection position connecting the shell 1 and the top cover 2 overlaps with the installation position of the BMS module described below, that is, the battery management module, in the vertical direction, saving space.

[0112] It should be noted that the top cover 2 and the shell 1 can also be connected by snap fastening or welding.

[0113] In this embodiment, preferably, the battery module further includes a battery management module (not shown in the figure), which is mounted on the upper surface of the top cover 2;

[0114] Further, preferably, a stud 21 is formed on the upper surface of the top cover 2, and preferably, a cylinder is formed on the upper surface of the top cover 2, a threaded hole is opened inside the cylinder, or an external thread is set on the outside of the cylinder to form the aforementioned stud 21 for installing the battery management module, and preferably, the battery management module is fixed to the top cover 2 by connecting the battery management module and the aforementioned threaded hole with screws or bolts.

[0115] In this embodiment, preferably, the inner wall surfaces of the housing 1 and the top cover 2 are both provided with an insulating film or coating to play an insulating role.

[0116] 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 battery module, characterized in that: include: A shell and a top cover; wherein an opening is formed at the top of the shell, and the top cover is sealed at the top opening of the shell; the top cover and the shell are made of different materials, and the strength of the top cover is greater than the strength of the shell; The shell is made of aluminum alloy or steel; The top cover is made of aluminum alloy or steel; The battery module further includes a battery pack, the battery pack includes a plurality of battery cells, and the plurality of battery cells are stacked together in sequence along a first direction; The battery module further comprises a bracket, the bracket is formed with a via hole, and the tab of the battery pack is inserted into the via hole; The battery module further comprises a conductive bar, and the conductive bar is arranged on a side of the bracket away from the battery cell, and the tab is connected to the conductive bar; One of the conductive bar and the bracket is formed with a first positioning portion, the other of the conductive bar and the bracket is formed with a first positioning hole, and the first positioning portion is inserted into the first positioning hole.

2. The battery module according to claim 1, characterized in that: When the shell is made of aluminum alloy, the shell is made of 5 series aluminum alloy or 3 series aluminum alloy; and / or The shell is a sheet metal bending part.

3. The battery module according to claim 1, characterized in that: When the material of the top cover is aluminum alloy, the material is 6 series aluminum alloy; and / or The top cover is a profile part or a die-casting part.

4. The battery module according to claim 1, characterized in that: The shell includes a bottom plate and two side plates, and the two side plates are respectively arranged on both sides of the bottom plate; along the first direction, the two side plates are respectively against the large surface sides of the two battery cells located at the edge.

5. The battery module according to claim 4, characterized in that: The battery module further includes a buffer pad, and the buffer pad is disposed between each or a plurality of the battery cells, and / or the buffer pad is disposed on a large surface of at least one side of the battery pack along a direction perpendicular to the first direction.

6. The battery module according to claim 5, characterized in that: The buffer pad inside the battery pack is fixedly connected to the adjacent battery cells by gluing; and / or The buffer pads on the two major surfaces of the battery pack are fixedly connected to the housing and the adjacent battery cells by gluing; and / or In the first direction, the thickness of the battery pack and the buffer pad is greater than or equal to the width of the inner cavity of the shell.

7. The battery module according to claim 1, characterized in that: The support is formed with an isolation portion arranged on a side of the conductive bar; and / or The battery module further includes a temperature sensor, which is disposed on a side of the bracket close to the battery cell and is used to collect the temperature of the battery cell; The battery module further comprises a circuit board, and the circuit board and the conductive bar are located on the same side of the bracket, and the circuit board is connected to the conductive bar and the temperature sensor; A second positioning portion is formed on one of the circuit board and the bracket, a second positioning hole is formed on the other of the circuit board and the bracket, and the second positioning portion is inserted into the second positioning hole.

8. The battery module according to claim 1, characterized in that: One of the bracket and the shell is formed with a third positioning portion, the other of the bracket and the shell is formed with a third positioning hole or positioning groove, and the third positioning portion is inserted into the third positioning hole or positioning groove; and / or The bracket is detachably connected to the housing via a first fastening member; and / or The battery module also includes an isolation protection cover, and the isolation protection cover is arranged on a side of the bracket away from the battery cell and is used to cover the pole ear.

9. The battery module according to claim 1, characterized in that: The battery module further includes a heating device, and the heating device is arranged at the top or bottom of the battery module along the height direction thereof.

10. The battery module according to claim 9, characterized in that: The heating device is connected to the battery pack by gluing; and / or A heat-insulating component is arranged between the heating device and the top cover or the bottom of the shell.

11. The battery module according to any one of claims 1 to 10, characterized in that: The top cover is U-shaped, and two sides of the top cover are respectively against two inner side walls of the shell, and are detachably connected via a second fastening member; and / or The inner wall surfaces of the housing and the top cover are both provided with an insulating film or a coating; and / or The upper surface of the top cover is formed with studs; and / or The battery module also includes a battery management module, and the battery management module is arranged on the upper surface of the top cover.

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