Limiting device for battery module

Abstract

The utility model relates to a limiting device for a battery module, which comprises a first shell, a second shell and a cover plate, a plurality of first battery cell grooves are formed in the inner side of the first shell and are used for limiting one side of a battery cell; a boss is mounted in the first battery cell groove and is used for reserving an exhaust space for the exhaust valve; the second shell is detachably connected with the first shell, and an inner cavity formed by the first shell and the second shell is used for accommodating a battery cell module consisting of a plurality of battery cells; the cover plate is located between the first shell and the second shell, and the cover plate is connected with the second shell; a second battery cell groove is formed in the cover plate and is used for limiting the other side of the battery cell. According to the utility model, by arranging the first battery cell groove and the second battery cell groove, the two sides of the battery cell are limited; and the boss with the inner cavity is arranged, so that the exhaust valve has a certain exhaust space, and the battery cell is prevented from being swelled due to overhigh internal pressure.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a limiting device for battery module. BACKGROUND

[0002] New energy application scenarios often need specific high voltage and large current. For example, new energy vehicles usually need several hundred volts and several hundred amperes to ensure power performance. The voltage and current output of a single battery is limited, such as the common lithium ion battery single voltage which is generally 3.6V to 3.7V. The voltage can be increased by connecting multiple batteries in series, and the current can be increased by connecting multiple batteries in parallel. The combined battery module can meet the requirements of high voltage and large current of equipment. For new energy vehicles, it is inevitable to be affected by road bumps and vibrations during driving. Long-term vibration will cause the fixed parts of the battery module to gradually loosen.

[0003] The utility model discloses a battery module adapter plate welding tool, and is applied to the technical field of battery manufacturing. The battery module adapter plate welding tool comprises a base and a cover plate module. The base is used for bearing the battery module. The cover plate module is arranged on the battery module. The cover plate module comprises a first cover plate. The first cover plate is provided with a first positioning part and a second positioning part. The first positioning part is connected with the battery module and is used for fixing the first cover plate on the battery module. The second positioning part is arranged on the first positioning part and is used for limiting the adapter plate. The first cover plate and the battery module are relatively fixed through the first positioning part. The first cover plate and the adapter plate are relatively fixed through the second positioning part. Thus, the battery module and the adapter plate are relatively fixed. The relative sliding of the adapter plate and the first cover plate during welding is avoided, and the welding effect is improved.

[0004] The above-mentioned prior art only limits the top surface of the battery module. The batteries may still be misaligned with each other during vehicle collision or vibration.

[0005] In addition, a pressing head assembly needs to be installed above each adapter plate. The pressing head assembly is used for pressing the adapter plate tightly. If the pressing force of the pressing head is too large, the adapter plate may be deformed, cracked or even broken, especially for some busbars with soft material or thin thickness, which is more likely to occur, affecting the conductivity and mechanical strength of the adapter plate. UTILITY MODEL CONTENTS

[0006] In view of the above-mentioned defects in the prior art, such as the easy position deviation between the batteries, the excessive setting of parts, and the irreversible damage to the adapter plate, the utility model aims to provide a limiting device for limiting the battery module by multiple ways to avoid the misalignment between the battery cells.

[0007] The technical scheme provided by the utility model discloses

[0008] A limiting device for battery module, comprising:

[0009] The first shell is internally provided with a plurality of first battery cell grooves, the inner diameter of the first battery cell groove is matched with the outer diameter of the battery cell, a boss is installed in the first battery cell groove, and the boss is in abutment with one end of the battery cell.

[0010] The second shell is detachably connected with the first shell, and the inner cavity formed by the first shell and the second shell is used for accommodating the battery cell module composed of a plurality of battery cells.

[0011] The cover plate is located between the first shell and the second shell, and the cover plate is connected with the second shell; the cover plate is provided with a second battery cell groove with an inner diameter matched with the outer diameter of the battery cell, and the second battery cell groove corresponds to the first battery cell groove.

[0012] The first battery cell groove and the second battery cell groove are arranged to preliminarily limit the battery cell and provide an exhaust space for the exhaust valve.

[0013] Further, a pole limiting portion is also installed in the first battery cell groove, the first pole of the battery cell is located in the pole limiting portion, and the pole limiting portion is used for limiting the first pole.

[0014] Further, along the central axis direction of the boss, the projection of the pole limiting portion falls within the projection range of the boss.

[0015] Further, the height of the pole limiting portion is not greater than the height of the boss, so that the battery cell can be completely limited, and the exhaust space of the exhaust valve can be avoided.

[0016] Further, the height of the boss is less than the height of the first battery cell groove, so that one side of the battery cell can be built-in in the first battery cell groove, and the exhaust valve has a certain exhaust space, so that the exhaust valve can exhaust the excess gas.

[0017] Further, the cover plate comprises a first surface and a second surface arranged oppositely along the thickness direction.

[0018] The first surface is provided with a plurality of bus bars limiting portions for limiting the bus bars, and the bus bar limiting portions are protruded from the first surface; and the second battery cell groove is located on the second surface.

[0019] Further, the bus bar is provided with a through hole for the bus bar limiting portion to pass through.

[0020] Further, each bus bar is limited by two bus bar limiting portions, so that the bus bar will not be deflected under external force.

[0021] Further, the first through hole is matched with the size of the second pole column at the other end of the battery cell, and the polarity of the battery cell exposed through the second through hole is opposite to the polarity of the second pole column.

[0022] Further, the first surface is further provided with a plurality of limiting pins, the inner surface of the second shell is provided with pin holes at positions corresponding to the limiting pins, the limiting pins are matched with the pin holes, and the detachable connection of the cover plate and the second shell is realized.

[0023] Compared with the prior art, the technical scheme has the following beneficial effects:

[0024] (1) The first battery cell groove and the second battery cell groove are arranged to limit the battery cell from both sides, so that the battery cell is preliminarily limited; and the pole column limiting portion is arranged to realize the overall limiting of the battery cell.

[0025] (2) The protrusion with the inner cavity is arranged to accommodate the exhaust valve, so that the exhaust valve has a certain exhaust space, and the battery cell is prevented from bulging due to excessive internal pressure.

[0026] (3) The two bus bar limiting portions are arranged to completely fix the bus bar, so that the bus bar is prevented from being displaced, loosened or fallen off due to external force such as vibration and impact, and problems such as poor connection and short circuit are avoided, and the stability of the battery system under different working conditions is improved, such as the bumpy road condition in the driving process of the electric vehicle, so that the normal work of the battery system is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the limiting device in an embodiment of the application;

[0028] Figure 2 It is a schematic diagram of the structure of the first shell and the cover plate in an embodiment of the application;

[0029] Figure 3 A schematic diagram of a second housing structure in an embodiment of the present application;

[0030] Figure 4 A front view of a first housing in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of a boss structure in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of a busbar position in an embodiment of the present application;

[0033] Figure 7 A schematic diagram of a busbar limiting portion structure in an embodiment of the present application;

[0034] Figure 8 A front view of a cover plate in an embodiment of the present application;

[0035] Figure 9 A rear view of a cover plate in an embodiment of the present application;

[0036] Figure 10 A schematic diagram of a stop portion structure in an embodiment of the present application;

[0037] Figure 11 A front view of a second housing in an embodiment of the present application;

[0038] Figure 12 A schematic diagram of an insulating rib structure in an embodiment of the present application;

[0039] Figure 13 A schematic diagram of a first pole of a battery cell and an exhaust valve in an embodiment of the present application;

[0040] Figure 14 A schematic diagram of a second pole of a battery cell in an embodiment of the present application.

[0041] Explanation of reference numerals in the schematic diagrams:

[0042] First housing 1, first battery cell slot 11, boss 111, pole limiting portion 112, first slot 12;

[0043] Second housing 2, bolt hole 20, second slot 21;

[0044] Cover plate 3, limiting bolt 30, second battery cell slot 31, busbar limiting portion 32, first through hole 33, second through hole 34, insulating rib 35, stop portion 36;

[0045] Battery cell 4, exhaust valve 40, first pole 41, second pole 42;

[0046] Busbar 5;

[0047] Interface 6. DETAILED DESCRIPTION

[0048] For further understanding of the present application, the present application will be described in detail with reference to the drawings and embodiments.

[0049] The structure, proportion, size, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, for understanding and reading by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like used in the present specification are only for the convenience of clear description, and are not used to limit the implementation range, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation scope of the present application.

[0050] The battery module is usually connected by a plurality of battery monomers in series, parallel or other ways. Fixing the battery module can ensure that these connection points maintain good contact, avoid problems such as increased resistance and poor contact caused by looseness. Stable electrical connection helps to ensure stable voltage and current output of the battery module, so that the equipment can operate normally.

[0051] The well-fixed battery module can work cooperatively with other components (such as battery management system, shell, etc.) to form a stable whole, which can withstand various forces (such as gravity, centrifugal force, etc.) generated during the operation of the equipment.

[0052] If the battery module is not fixed during use, it may be loosened due to shaking, collision, etc., or the positive and negative electrodes of the battery may come into contact with other metal components, thereby causing a short circuit. The short circuit may generate a large amount of heat, and even cause a fire, explosion or other serious safety accidents.

[0053] The present application provides a limiting device for a battery module, which comprises a first shell 1, a second shell 2 and a cover plate 3. The cover plate 3 is located between the first shell 1 and the second shell 2, and the cover plate 3 is detachably connected with the second shell 2.

[0054] The first shell 1 and the second shell 2 are detachably connected, and the inner cavity formed by the two shells is used to accommodate a plurality of battery cells 4 to form a battery cell module. More specifically, a plurality of first battery cell grooves 11 are arranged on the inner side of the first shell 1, and each battery cell 4 corresponds to one first battery cell groove 11. The inner diameter of the first battery cell groove 11 is matched with the outer diameter of the battery cell 4, and is used to limit one side of the battery cell 4.

[0055] The cover plate 3 includes a first surface and a second surface arranged oppositely along the thickness direction, the first surface is opposite to and in contact with the second shell 2, and the second surface is away from the second shell 2, and the second surface is provided with second cell grooves 31. Similarly, the inner diameter of the second cell groove 31 is matched with the outer diameter of the cell 4, and the positions of the second cell grooves 31 are all matched with the first cell grooves 11, and the second cell grooves 31 are used for limiting the other side of the cell 4.

[0056] By arranging the two sides of each cell 4 in the first cell groove 11 and the second cell groove 31, the battery module composed of the cell 4 is preliminarily limited.

[0057] More specifically, one end of the cell 4 is provided with an exhaust valve 40, and the first cell groove 11 is provided with a boss 111 having an inner cavity for accommodating the exhaust valve 40. The boss 111 abuts against one end of the cell 4, and along the central axis direction of the boss 111, the projection of the exhaust valve 40 falls within the projection range of the boss 111. The height of the boss 111 is less than the height of the first cell groove 11, which not only ensures that one side of the cell 4 can be arranged in the first cell groove 11, but also ensures that the exhaust valve 40 has a certain exhaust space, so as to ensure that the exhaust valve 40 can exhaust excess gas, prevent the cell 4 from bulging, rupturing or even exploding due to excessive internal pressure, and thus protect the safety of the entire battery module.

[0058] The first cell groove 11 is also provided with a pole limiting portion 112, and the two ends of the cell 4 are respectively provided with a first pole 41 and a second pole 42, wherein the first pole 41 is located on the same side as the exhaust valve 40. The first pole 41 is matched with the pole limiting portion 112, and the first pole 41 is located in the pole limiting portion 112, and the pole limiting portion 112 is used for limiting the first pole 41, so as to avoid the cell 4 from rotating due to external force (such as vibration) during use. It is worth noting that the height of the pole limiting portion 112 is not greater than the height of the boss 111, which can ensure that the boss 111 abuts against the end surface of the cell 4. Along the central axis direction of the boss 111, the projection of the pole limiting portion 112 falls within the projection range of the boss 111.

[0059] The first surface of the cover plate 3 is provided with a plurality of bus bar limiting portions 32, the bus bar limiting portions 32 are protruded from the first surface, the bus bar 5 is provided with through holes for the bus bar limiting portions 32 to pass through, and the bus bar limiting portions 32 are used for limiting the bus bar 5. Preferably, each bus bar 5 is limited by two bus bar limiting portions 32. The bus bar 5 connects a plurality of cells 4 in series or parallel, so that the battery module can output higher voltage and current capacity.

[0060] The first through hole 33 and the second through hole 34 are arranged in each second battery cell groove 31, wherein the size of the first through hole 33 is matched with the size of the second pole column 42, and the polarity of the exposed battery cell 4 through the second through hole 34 is opposite to the polarity of the second pole column 42. The busbar 5 is welded with the exposed battery cell 4 and the second pole column 42, thereby increasing the output capacity of the voltage and the current of the battery module. In the application, one busbar 5 can simultaneously connect four battery cells in series and in parallel.

[0061] In the range of each second battery cell groove 31, the first through hole 33 and the second through hole 34 are separated by the insulating rib 35, and the insulating rib 35 protrudes from the first surface. The insulating rib 35 is used to avoid the contact between the busbars 5, thereby avoiding the short circuit between the busbars 5.

[0062] The first surface is also provided with a plurality of limiting pins 30, and the inner surface of the second shell 2 is provided with pin holes 20 at positions corresponding to the limiting pins 30. The limiting pins 30 are matched with the pin holes 20, thereby realizing the detachable connection between the second shell 2 and the cover plate 3.

[0063] In the application, the plurality of battery cells 4 are arranged in layers, and a certain spacing is required between the battery cells 4. Therefore, the second battery cell grooves 31 are provided with corresponding spacing. If the battery cells 4 are in close contact with each other, the heat is difficult to dissipate, which may cause the temperature in the battery module to rise. The high temperature may affect the performance and service life of the battery, and even may cause safety problems. Maintaining a certain spacing can provide a channel for air flow, thereby facilitating the dissipation of heat through air convection, and maintaining the temperature in the battery pack within a reasonable range.

[0064] The stop portions 36 are arranged between every two second battery cell grooves 31, and the stop portions 36 protrude from the second surface. The surface opposite to the battery cell 4 of the stop portion 36 is smooth, thereby avoiding scratching the battery cell 4 during long-term use. The stop portion 36 abuts against the outer wall of the battery cell 4, thereby limiting the movement of the battery cell 4, so that the adjacent battery cells 4 can maintain a certain spacing and be relatively fixed.

[0065] The first shell 1 is substantially a cuboid, and the first battery cell groove 11 is located at the inner side of the first top surface of the cuboid. The remaining surfaces are first frame surfaces, which are adjacent to the first top surface and perpendicular to each other. A plurality of first notches 12 are arranged on the inner side of the first frame surface along the central axis direction of the first battery cell groove 11.

[0066] Correspondingly, the second shell 2 is also substantially a cuboid, and the pin hole 20 is located at the inner side of the second top surface of the cuboid. The remaining surfaces are second frame surfaces, which are adjacent to the second top surface and perpendicular to each other. A plurality of second notches 21 are arranged on the inner side of the second frame along the central axis direction of the pin hole 20, and the first notches 12 correspond to the second notches 21.

[0067] The detachable connection of the first shell 1 and the second shell 2 is realized by inserting the first slot 12 and the second slot 21 through the bolt assembly.

[0068] The interface 6 is electrically connected with the battery module, and the interface 6 is used for charging the battery module.

[0069] The above description of the utility model and its embodiments is illustrative, and is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments are not creatively designed, which should belong to the protection scope of the utility model.

Claims

1. A limiting device for a battery module, characterized by: The application relates to a limiting device for a battery module. The first shell (1) is internally provided with a plurality of first battery cell grooves (11) with an inner diameter matched with the outer diameter of a battery cell (4); a boss (111) is arranged in the first battery cell groove (11) and abuts against one end of the battery cell (4); along the central axis direction of the boss (111), the exhaust valve (40) at one end of the battery cell (4) is projected into the projection range of the boss (111); The second shell (2) is detachably connected with the first shell (1), and the inner cavity formed by the first shell (1) and the second shell (2) is used for accommodating a battery cell module composed of a plurality of battery cells (4); The cover plate (3) is arranged between the first shell (1) and the second shell (2) and is connected with the second shell (2); the cover plate (3) is provided with a second battery cell groove (31) with an inner diameter matched with the outer diameter of the battery cell (4), and the second battery cell groove (31) is oppositely arranged with the first battery cell groove (11).

2. The limiting device for a battery module according to claim 1, wherein: The first battery cell groove (11) is further provided with a pole limiting portion (112), the first pole (41) at one end of the battery cell (4) is arranged in the pole limiting portion (112), and the pole limiting portion (112) is used for limiting the first pole (41).

3. The limiting device for a battery module according to claim 2, wherein: Along the central axis direction of the boss (111), the projection of the pole limiting portion (112) falls into the projection range of the boss (111).

4. The limiting device for battery module according to claim 2, characterized in that: The height of the pole limiting portion (112) is not greater than the height of the boss (111).

5. The limiting device for battery module according to claim 1, wherein: The height of the boss (111) is less than the height of the first battery cell groove (11).

6. The limiting device for the battery module according to claim 1, characterized in that: The cover plate (3) comprises a first surface and a second surface oppositely arranged along the thickness direction; The first surface is provided with a plurality of bus bar limiting portions (32) for limiting the bus bar (5), and the bus bar limiting portion (32) is protruded from the first surface; and the second battery cell groove (31) is arranged on the second surface.

7. The limiting device for a battery module according to claim 6, wherein: The bus bar (5) is provided with a through hole for the bus bar limiting portion (32) to pass through.

8. The limiting device for a battery module according to claim 7, wherein: Each bus bar (5) is limited by two bus bar limiting portions (32).

9. The limiting device for the battery module according to claim 6, characterized in that: Each second battery cell groove (31) is provided with a first through hole (33) and a second through hole (34); The size of the first through hole (33) is matched with the size of the second pole (42) at the other end of the battery cell (4); The polarity of the battery cell (4) exposed through the second through hole (34) is opposite to the polarity of the second pole (42).

10. The limiting device for a battery module according to claim 6, wherein: The first surface is further provided with a plurality of limiting bolts (30), the inner surface of the second shell (2) is provided with bolt holes (20) corresponding to the positions of the limiting bolts (30), and the limiting bolt (30) is matched with the bolt hole (20).

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