Battery module

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a battery module which comprises a shell, a battery cell bracket and a supporting assembly, the battery cell bracket is arranged in the shell, and a mounting position for placing the battery cell is arranged on the battery cell bracket. The supporting assembly comprises a supporting rod and two pressure-bearing blocks, the supporting rod is arranged on the battery cell support in a penetrating mode, the two ends of the supporting rod are each connected with one pressure-bearing block, and the pressure-bearing blocks abut against the side wall of the shell. The two opposite side walls of the shell can be supported through the supporting assembly, so that the extrusion resistance and the impact resistance of the shell are improved, the risks of short circuit, breakage or combustion and the like of the battery cell caused by extrusion of the battery cell due to deformation of the shell are avoided, and the safety of a user is guaranteed. And the supporting assembly is light in overall weight, so that energy conservation and emission reduction are facilitated, meanwhile, the supporting assembly does not occupy too much space in the shell, the space utilization is reasonable, the arrangement of the battery cells in the battery module is not influenced, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module. Background Art

[0002] Secondary lithium batteries in light electric vehicles need to meet the overall safety requirements of the European Committee for Electrotechnical Standardization before they can be put on the market for normal sales and application to ensure user safety. The overall safety requirements of the European Committee for Electrotechnical Standardization include test items that simulate vehicle accidents, which require extrusion tests on secondary lithium batteries. During the extrusion test, the shell of the secondary lithium battery is impacted and squeezed by a test head (generally using materials with a high Young's modulus, such as steel, ceramics, etc.) to test the maximum external force that the secondary lithium battery can withstand, and mechanically try to avoid short circuits, ruptures or combustion of the secondary lithium battery cells, thereby ensuring user safety.

[0003] At present, the prior art generally adopts the method of thickening the shell to improve the compression strength and impact strength of the shell of the secondary lithium battery so that it can pass the above-mentioned compression test. However, adopting this solution, on the one hand, the material cost of making the shell increases, and on the other hand, the weight of the secondary lithium battery also increases significantly, which is not conducive to energy conservation and emission reduction. Utility Model Content

[0004] The purpose of the utility model is to provide a battery module, which supports the outer shell by arranging a support component to improve the outer shell's anti-extrusion and anti-impact capabilities, and the overall weight of the support component is light, occupies a small space, does not affect the arrangement of battery cells in the battery module, and is conducive to energy conservation and emission reduction.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a battery module, which includes:

[0007] shell;

[0008] A battery cell holder is arranged in the housing, and a mounting position is provided on the battery cell holder, and the mounting position is used to place the battery cell;

[0009] The support assembly comprises a support rod and two pressure blocks, wherein the support rod passes through the battery holder, the two pressure blocks are respectively connected to two ends of the support rod, and the two pressure blocks are respectively in contact with two opposite side walls of the housing.

[0010] Optionally, the battery cell bracket includes a first bracket and a second bracket, the first bracket is provided with a first hole on the side facing the second bracket, the second bracket is provided with a second hole on the side facing the first bracket, the first hole is opposite to the second hole, and the first hole and the second hole together constitute the installation position.

[0011] Optionally, in each of the supporting assemblies, one of the pressure blocks abuts against a side of the first bracket facing away from the second bracket, and another of the pressure blocks abuts against a side of the second bracket facing away from the first bracket.

[0012] Optionally, a first fixing tube is provided on the side of the first bracket facing away from the second bracket, and a second fixing tube is provided on the side of the second bracket facing away from the first bracket. Both ends of the support rod are respectively inserted into the first fixing tube and the second fixing tube, and the two pressure blocks are respectively abutted against the first fixing tube and the second fixing tube.

[0013] Optionally, at least one end of the support rod is provided with a connecting column, and the circumference of the connecting column is provided with an external thread, wherein at least one of the pressure blocks is provided with a connecting hole, and the inner wall of the connecting hole is provided with an internal thread matching the external thread.

[0014] Optionally, the pressure block includes a cylindrical portion and a truncated cone portion, a bottom surface of the truncated cone portion with a larger cross section is connected to the cylindrical portion, and a projection of the truncated cone portion on the outer shell coincides with a projection of the cylindrical portion on the outer shell;

[0015] The truncated cone portion is connected to the support rod, the truncated cone portion is in contact with the battery holder, and the cylindrical portion is in contact with the housing.

[0016] Optionally, a limiting groove is provided on the end surface of the cylindrical portion on the side abutting against the shell, and the limiting groove is arranged in a cross shape, a straight shape or a hexagonal shape.

[0017] Optionally, anti-slip teeth are provided on the circumference of the cylindrical portion.

[0018] Optionally, the support assembly is made of steel or iron, and the shell is made of aluminum.

[0019] Optionally, a plurality of the support assemblies are provided, and the plurality of the support assemblies are evenly spaced and arranged on the battery cell support.

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides a battery module, which includes a shell, a battery holder and a support assembly. The battery holder is arranged in the shell, and a plurality of mounting positions are provided on the battery holder, each mounting position is used to place a battery. The support assembly includes a support rod and two pressure blocks, the support rod is passed through the battery holder, and the two ends of the support rod are extended outside the battery holder, the two pressure blocks are respectively connected to the two ends of the support rod, and the two pressure blocks are respectively abutted against the two opposite side walls of the shell. The support assembly can support the two opposite side walls of the shell, thereby improving the anti-extrusion and anti-impact capabilities of the shell, thereby avoiding the shell from deforming and squeezing the battery, causing the battery to short-circuit, rupture or burn, etc., and ensuring the safety of the user. And because the overall weight of the support assembly is relatively light, it is conducive to energy conservation and emission reduction. At the same time, the support assembly will not occupy too much space in the shell, the space utilization is reasonable, and the arrangement of the battery in the battery module is not affected, and the manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an exploded view of a battery module and a test head provided in an embodiment of the utility model;

[0023] Figure 2 It is an assembly diagram of a battery module and a test head provided in an embodiment of the utility model under a simulated stress state;

[0024] Figure 3 It is a schematic cross-sectional structure diagram of a battery module (with the outer shell omitted) provided in an embodiment of the utility model;

[0025] Figure 4 It is a structural schematic diagram of a support assembly provided in an embodiment of the utility model;

[0026] Figure 5 It is a schematic cross-sectional structure diagram of a support assembly provided in an embodiment of the utility model;

[0027] Figure 6 for Figure 5 A partial enlarged view of point A in the middle.

[0028] In the figure:

[0029] 10. Test head;

[0030] 100, housing; 200, battery cell bracket; 210, first bracket; 211, first plug hole; 212, first fixing cylinder; 220, second bracket; 221, second plug hole; 222, second fixing cylinder; 300, battery cell; 400, supporting assembly; 410, supporting rod; 411, connecting column; 420, pressure block; 4201, connecting hole; 421, cylindrical portion; 4211, limiting groove; 4212, anti-slip teeth; 422, truncated cone portion. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] like Figure 1 and Figure 2As shown, this embodiment provides a battery module, which includes a shell 100, a battery holder 200 and a support assembly 400. The battery holder 200 is arranged in the shell 100, and a plurality of mounting positions are provided on the battery holder 200, each mounting position is used to place a battery 300. The support assembly 400 includes a support rod 410 and two pressure blocks 420, the support rod 410 is passed through the battery holder 200, and both ends of the support rod 410 extend out of the battery holder 200, the two pressure blocks 420 are respectively connected to the two ends of the support rod 410, and the two pressure blocks 420 are respectively abutted against two opposite side walls of the shell 100.

[0036] Exemplarily, the support rod 410 extends in the Z-axis direction, and the pressure blocks 420 at both ends of the support rod 410 abut against the upper side wall and the lower side wall of the housing 100, respectively. When the test head 10 impacts the housing 100 downward, the upper side wall and the lower side wall of the housing 100 can be supported by the support assembly 400, thereby improving the anti-extrusion and anti-impact capabilities of the housing 100, thereby preventing the housing 100 from deforming and extruding the battery cell 300, causing the battery cell 300 to short-circuit, rupture or burn, and other dangers, thereby ensuring user safety. In addition, since the overall weight of the support assembly 400 is relatively light, it is conducive to energy conservation and emission reduction. At the same time, the support assembly 400 will not occupy too much space in the housing 100, and the space utilization is reasonable, which does not affect the arrangement of the battery cells 300 in the battery module, and the manufacturing cost is low.

[0037] More preferably, in this embodiment, a plurality of support assemblies 400 are provided, and the plurality of support assemblies 400 are evenly spaced and arranged on the battery holder 200, and the support assemblies 400 all extend along the Z-axis direction. By evenly spaced and arranging a plurality of support assemblies 400, it is helpful to improve the uniformity of supporting the housing 100, so that when the test head 10 impacts from any position of the upper side wall or the lower side wall of the housing 100, the support assemblies 400 can play a good supporting role on the housing 100.

[0038] See also Figure 2 and Figure 3 The battery holder 200 in this embodiment includes a first holder 210 and a second holder 220. A first plug hole 211 is provided on the side of the first holder 210 facing the second holder 220, and a second plug hole 221 is provided on the side of the second holder 220 facing the first holder 210. The first plug hole 211 is opposite to the second plug hole 221. When installing the battery cell 300, the first holder 210 and the second holder 220 are close to each other, and the first plug hole 211 and the second plug hole 221 together form an installation position for placing the battery cell 300. The height direction of the battery cell 300 is set along the Z-axis direction, and the top and bottom ends of the battery cell 300 are respectively located in the first plug hole 211 and the second plug hole 221.

[0039] Furthermore, in each support assembly 400, one of the pressure blocks 420 abuts against the side of the first bracket 210 away from the second bracket 220, and the other pressure block 420 abuts against the side of the second bracket 220 away from the first bracket 210. In other words, in addition to supporting the housing 100, the support assembly 400 can also lock the first bracket 210 and the second bracket 220, so that the battery cell 300 is firmly fixed between the first bracket 210 and the second bracket 220, eliminating the need for the previous bolt setting, which is beneficial to reducing weight and saving costs. In addition, due to the different heights of the battery cells 300, support rods 410 of different lengths can be selected to adapt to the use of various types of battery cells 300, and the flexibility and applicability are good.

[0040] Continue to see Figure 3 A first fixing cylinder 212 is provided on the side of the first bracket 210 facing away from the second bracket 220, and a second fixing cylinder 222 is provided on the side of the second bracket 220 facing away from the first bracket 210. Both ends of the support rod 410 are respectively inserted into the first fixing cylinder 212 and the second fixing cylinder 222, and two pressure blocks 420 are respectively in contact with the first fixing cylinder 212 and the second fixing cylinder 222. On the one hand, the first fixing cylinder 212 and the second fixing cylinder 222 can play a guiding and limiting role for the installation of the support rod 410, so that the support rod 410 and the battery holder 200 are more closely matched; on the other hand, the first fixing cylinder 212 and the second fixing cylinder 222 can play a certain supporting role for the pressure block 420, which is conducive to increasing the overall anti-extrusion and anti-impact capabilities of the battery module and alleviating the deformation of the shell 100 when it is impacted.

[0041] As an optional solution, at least one end of the support rod 410 is provided with a connecting column 411, and the circumference of the connecting column 411 is provided with an external thread, wherein at least one pressure block 420 is provided with a connecting hole 4201, and the inner wall of the connecting hole 4201 is provided with an internal thread that matches the external thread, and the connecting column 411 of the support rod 410 is connected to the pressure block 420 by threads. That is to say, the pressure block 420 at at least one end is detachable so that the support rod 410 can pass through the battery holder 200 for easy disassembly and assembly. Of course, the other pressure block 420 and the support rod 410 can be fixed or detachable, and can be set as needed.

[0042] See also Figure 4-Figure 6 In this embodiment, both ends of the support rod 410 are provided with connecting columns 411, and each pressure block 420 is provided with a connecting hole 4201, and the two pressure blocks 420 and the support rod 410 are both detachable.

[0043] Exemplarily, each pressure block 420 includes a cylindrical portion 421 and a truncated cone portion 422, the bottom surface of the truncated cone portion 422 with a larger cross section is connected to the cylindrical portion 421, and the projection of the truncated cone portion 422 on the housing 100 coincides with the projection of the cylindrical portion 421 on the housing 100. The truncated cone portion 422 is connected to the support rod 410, the top surface of the truncated cone portion 422 with a smaller cross section can abut against the first fixing cylinder 212 or the second fixing cylinder 222 on the battery cell holder 200, and the cylindrical portion 421 abuts against the housing 100. Since the cross-sectional areas of the cylindrical portion 421 at various positions are the same, and the projection of the cylindrical portion 421 on the outer shell 100 coincides with the projection of the truncated cone portion 422 on the outer shell 100, the surface where the cylindrical portion 421 contacts the outer shell 100 is the surface with the largest cross-sectional area on the pressure block 420, thereby increasing the contact area between the pressure block 420 and the outer shell 100, which is beneficial to increasing the maximum test force that the outer shell 100 can withstand, that is, the overall extrusion resistance and impact resistance of the battery module are improved.

[0044] Furthermore, a limiting groove 4211 is provided on the end surface of the cylindrical portion 421 abutting against the housing 100, and the limiting groove 4211 is cross-shaped, straight-shaped or hexagonal. The limiting groove 4211 can be matched with a screwdriver or other special locking tools in the prior art for locking, so as to facilitate the installation of the pressure block 420 and the support rod 410.

[0045] Optionally, anti-skid teeth 4212 may be provided on the circumference of the cylindrical portion 421. Before locking with a screwdriver or other dedicated locking tools, the pressure block 420 and the connecting column 411 may be manually screwed together. The provision of the anti-skid teeth 4212 may increase the friction between the human hand and the pressure block 420, making it easier to apply force. Of course, in other embodiments, anti-skid patterns or anti-skid pads may also be provided on the circumference of the cylindrical portion 421, which is not limited in this embodiment.

[0046] Furthermore, the support assembly 400 in this embodiment is made of steel or iron. Since the Young's modulus of steel or iron is relatively high, which can reach 2.9 GMPa, it helps to support the shell 100, alleviate the deformation of the shell 100 when it is impacted, and prevent the battery cell 300 from being short-circuited, ruptured or burned due to pressure, thereby ensuring the safety of the battery module. The shell 100 is made of aluminum, which can reduce weight and save energy.

[0047] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery module, characterized in that: include: Housing (100); A battery cell support (200) is arranged in the housing (100), and a mounting position is provided on the battery cell support (200), and the mounting position is used to place the battery cell (300); A support assembly (400) comprises a support rod (410) and two pressure blocks (420), wherein the support rod (410) is inserted into the battery cell support (200), and the two pressure blocks (420) are respectively connected to two ends of the support rod (410), and the two pressure blocks (420) are respectively in contact with two opposite side walls of the housing (100).

2. The battery module according to claim 1, characterized in that: The battery cell support (200) comprises a first support (210) and a second support (220); a first plug hole (211) is provided on a side of the first support (210) facing the second support (220); a second plug hole (221) is provided on a side of the second support (220) facing the first support (210); the first plug hole (211) is opposite to the second plug hole (221); the first plug hole (211) and the second plug hole (221) together constitute the installation position.

3. The battery module according to claim 2, characterized in that: In each of the supporting assemblies (400), one of the pressure blocks (420) abuts against a side of the first bracket (210) facing away from the second bracket (220), and the other pressure block (420) abuts against a side of the second bracket (220) facing away from the first bracket (210).

4. The battery module according to claim 3, characterized in that: A first fixed tube (212) is provided on the side of the first bracket (210) facing away from the second bracket (220), and a second fixed tube (222) is provided on the side of the second bracket (220) facing away from the first bracket (210). Both ends of the support rod (410) are respectively inserted into the first fixed tube (212) and the second fixed tube (222), and the two pressure blocks (420) are respectively in contact with the first fixed tube (212) and the second fixed tube (222).

5. The battery module according to claim 1, characterized in that: At least one end of the support rod (410) is provided with a connecting column (411), and the circumference of the connecting column (411) is provided with an external thread, wherein at least one of the pressure blocks (420) is provided with a connecting hole (4201), and the inner wall of the connecting hole (4201) is provided with an internal thread that matches the external thread.

6. The battery module according to claim 1, characterized in that: The pressure bearing block (420) comprises a cylindrical portion (421) and a truncated cone portion (422), the bottom surface of the truncated cone portion (422) is connected to the cylindrical portion (421), and the projection of the truncated cone portion (422) on the housing (100) coincides with the projection of the cylindrical portion (421) on the housing (100); The truncated cone portion (422) is connected to the support rod (410), the top surface of the truncated cone portion (422) abuts against the battery cell support (200), and the cylindrical portion (421) abuts against the housing (100).

7. The battery module according to claim 6, characterized in that: A limiting groove (4211) is provided on the end surface of the cylindrical portion (421) on the side abutting against the housing (100), and the limiting groove (4211) is arranged in a cross shape, a straight shape or a hexagonal shape.

8. The battery module according to claim 6, characterized in that: Anti-slip teeth (4212) are provided in the circumference of the cylindrical portion (421).

9. The battery module according to claim 1, characterized in that: The support assembly (400) is made of steel or iron, and the housing (100) is made of aluminum.

10. The battery module according to claim 1, characterized in that: A plurality of the support assemblies (400) are provided, and the plurality of the support assemblies (400) are evenly spaced and arranged on the battery cell support (200).

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