Battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack. The bottom plate is inwards convexly provided with a supporting bulge which is integrated with the bottom plate, the battery cell components are supported on the supporting bulge, end plates are arranged at two ends of each battery cell component along the first direction, and the end plates are fixed on the supporting bulge. According to the battery pack, the supporting protrusions are integrally arranged on the bottom plate in the protruding mode, and the end plates can be fixed to the bottom plate with the supporting protrusions as connecting pieces, so that in the manufacturing process of the bottom plate, a support does not need to be additionally welded to the bottom plate, manufacturing of the bottom plate is simpler, the reliability of the integrated supporting protrusions is higher, and when vibration and other situations occur, the battery pack is not damaged. And the condition that the battery pack is separated from the bottom plate is avoided, and the stability of the battery pack structure is improved.

Description

Technical Field

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

[0002] A battery pack includes a battery pack case and a cell assembly placed therein. The cell assembly includes multiple cells arranged side by side in one direction. Since the cells will expand to a certain extent after working for a long time, end plates need to be added at both ends of the cell assembly to limit the expansion of the cells. In existing battery packs, it is often necessary to weld an additional bracket on the battery pack case to fix the end plate. The disadvantage is that when the battery pack is transported and vibrated, the bracket is often not firmly welded to the case, resulting in unstable module fixation. In addition, the insufficient strength of the module bracket, such as the material and thickness, also causes the module to deform and shake during transportation, which greatly affects the safety and stability factor of the battery pack.

[0003] Therefore, there is an urgent need to design a battery pack to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack that solves the problem of structural instability of the battery pack during transportation and vibration caused by insufficient connection strength between the fixing bracket and the box body of the traditional battery pack.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Battery pack, including:

[0007] A battery cell assembly, comprising a plurality of arranged battery cells;

[0008] A battery pack box, the battery pack box comprising a bottom plate, the bottom plate being provided with a supporting protrusion integral with the bottom plate, the battery cell assembly being supported by the supporting protrusion;

[0009] End plates are provided at both ends of each of the battery cell assemblies along the first direction, and the end plates are fixed to the supporting protrusions.

[0010] As an optional solution, a receiving groove is formed on the back side of the supporting protrusion;

[0011] The battery pack also includes a connecting assembly, which includes a screw and a locking member. The screw passes through the end plate and the bottom plate in sequence along a third direction. The locking member is threadedly connected to the screw to lock the end plate and the screw. The locking member is located in the accommodating groove, and the third direction is perpendicular to the first direction.

[0012] As an optional solution, the locking member is connected to the base plate by welding.

[0013] As an optional solution, the screw includes:

[0014] The rod portion is passed through the above-mentioned end plate and the above-mentioned bottom plate in sequence;

[0015] The limiting portion is connected to one end of the rod and abuts against the top of the end plate. The other end of the rod is located in the accommodating groove. The locking member is threadedly connected to the other end of the rod.

[0016] As an optional solution, the end plate is placed on the supporting protrusion, and the height of the end plate is greater than or equal to the height of the battery core.

[0017] As an optional solution, an air duct groove is provided on the top of the above-mentioned support protrusion, and an air inlet and an air outlet connected to the above-mentioned air duct groove are respectively provided on two opposite sides of the above-mentioned support protrusion.

[0018] As an optional solution, the above-mentioned supporting protrusion and the above-mentioned air duct groove both extend along the above-mentioned first direction, and the above-mentioned air inlet and the above-mentioned air outlet are arranged on two opposite sides of the above-mentioned supporting protrusion along the above-mentioned first direction.

[0019] As an optional solution, at least two of the supporting protrusions are spaced apart in a second direction, and the second direction is perpendicular to the first direction.

[0020] As an optional solution, the air inlet is oblong, and at least two air inlets are provided on each side, and the at least two air inlets are spaced apart along the second direction; and / or

[0021] The air outlet is in an oblong shape, and at least two air outlets are provided on each side, and the at least two air outlets are spaced apart along the second direction;

[0022] The second directions are respectively perpendicular to the first directions.

[0023] As an optional solution, the supporting protrusion and the air duct groove are formed by a stamping process.

[0024] As an optional solution, the accommodating groove is annular and is staggered with the air duct groove on the other side.

[0025] The beneficial effects of the present invention are:

[0026] The utility model provides a battery pack, in which a supporting protrusion is integrally provided on a bottom plate, and an end plate can be fixed to the bottom plate using the supporting protrusion as a connecting piece, so that in the process of manufacturing the bottom plate, there is no need to additionally weld a bracket on the bottom plate, the manufacturing of the bottom plate is simpler, the reliability of the integrated supporting protrusion is stronger, and it will not separate from the bottom plate when vibration occurs, thereby improving the stability of the battery pack structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a battery pack provided by an embodiment of the present utility model;

[0028] Figure 2 This is a cross-sectional view of the battery pack provided by an embodiment of the present invention at the air inlet and air outlet positions;

[0029] Figure 3 This is a cross-sectional view of the battery pack provided by an embodiment of the present invention at the position of the end plate and the connection assembly;

[0030] Figure 4 This is a cross-sectional view of the battery pack provided by an embodiment of the present invention at the battery cell position;

[0031] Figure 5 It is a structural schematic diagram of the battery pack box provided by an embodiment of the present utility model.

[0032] In the picture:

[0033] 100. Battery pack box;

[0034] 10. Bottom plate; 11. Support protrusion; 111. Air duct groove; 112. Air inlet; 113. Air outlet; 12. Main body; 13. Accommodation groove;

[0035] 20. Side panels;

[0036] 200, battery cell assembly; 210, battery cell;

[0037] 300, end plate;

[0038] 400, connecting assembly; 410, screw; 411, rod; 412, limiting portion; 420, locking member. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0040] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0043] like Figure 1 As shown, this embodiment provides a battery pack, which includes a battery pack case 100 and a cell assembly 200 placed in the battery pack case 100, each cell assembly 200 includes a plurality of battery cells 210 arranged side by side along a first direction (X direction in the figure). Specifically, the cell assembly 200 is placed on the bottom plate 10 of the battery pack case 100, and the battery pack case 100 also includes two side plates 20 connected to the bottom plate 10.

[0044] Since the battery cell 210 will expand to a certain extent after working for a long time, it is necessary to add end plates 300 at both ends of the battery cell assembly 200 to limit the expansion of the battery cell 210. In existing battery packs, it is often necessary to additionally weld a bracket to fix the end plate 300 on the battery pack case 100. The disadvantage is that when the battery pack is transported and vibrated, the bracket is often not firmly welded to the battery pack case 100, resulting in unstable module fixation. In addition, the insufficient strength of the module bracket, such as the material and thickness, also causes the module to deform and shake during transportation, which greatly affects the safety and stability factor of the battery pack.

[0045] In order to solve the above problems, in this embodiment, Figure 1 and Figure 2 As shown, the base plate 10 is provided with an inwardly protruding support protrusion 11 integral with the base plate 10, and the battery cell assembly 200 is supported on the support protrusion 11. Each battery cell assembly 200 is provided with an end plate 300 at both ends along the first direction, and the end plate 300 is fixed to the support protrusion 11. The above-mentioned battery pack has an integrally protruding support protrusion 11 on the base plate 10, and the end plate 300 can be fixed to the base plate 10 using the support protrusion 11 as a connecting member. This makes it unnecessary to weld an additional bracket on the base plate 10 during the manufacturing process of the base plate 10, making the manufacturing of the base plate 10 simpler. The integrated support protrusion 11 is more reliable and will not separate from the base plate 10 in the event of vibration, thereby improving the stability of the battery pack structure.

[0046] Optionally, necessary components such as an insulating plate or a buffer plate are further designed between the battery cell 210 at the end and the end plate 300 at the corresponding end, which will not be described in detail here.

[0047] Alternatively, as Figure 2 and Figure 3 As shown, a receiving groove 13 is formed on the back side of the supporting protrusion 11. The battery pack also includes a connecting assembly 400 on the basis of the end plate 300. The connecting assembly 400 includes a screw 410 and a locking member 420. The screw 410 passes through the end plate 300 and the base plate 10 in sequence along a third direction (Z direction in the figure, which is perpendicular to the X direction). The locking member 420 is threadedly connected to the screw 410 to lock the end plate 300 and the screw 410. The locking member 420 is located in the receiving groove 13. Through the above arrangement, when fixing the end plate 300, the screw 410 is passed through the end plate 300 and the bottom plate 10 and then connected to the locking member 420. The locking member 420 is located in the accommodating groove 13 and will not affect the flatness of the lower side of the bottom plate 10. This connection method eliminates the need to weld a bracket on the battery pack case 100, solving the problem of structural instability of the traditional battery pack during transportation and vibration due to insufficient connection strength between the fixing bracket and the battery pack case 100.

[0048] Alternatively, as Figure 3 As shown, the screw rod 410 includes a rod portion 411 and a stopper portion 412. The rod portion 411 passes through the end plate 300 and the bottom plate 10 in sequence. The stopper portion 412 is connected to one end of the rod portion 411 and abuts the top of the end plate 300. The other end of the rod portion 411 is located in the receiving groove 13. The locking member 420 is threadedly connected to the other end of the rod portion 411. With this arrangement, the locking member 420 abuts the top of the end plate 300 and the bottom of the receiving groove 13, thereby locking and securing the end plate 300.

[0049] Optionally, the locking member 420 is a nut. In other embodiments, the rod 411 may also be provided with a slot, and the locking member 420 may be a snap-fit ​​member, which may also achieve locking, and is not limited here.

[0050] Optionally, the locking member 420 is welded to the bottom plate 10. Through the above arrangement, when installing the screw rod 410, it is sufficient to screw the screw rod 410 and the locking member 420 to thread them together, thereby preventing the need to take the locking member 420 from elsewhere during connection, which is inconvenient to operate from the bottom.

[0051] Optionally, each end plate 300 is provided with two connection assemblies 400 to ensure balanced force on the end plate 300 .

[0052] In the prior art, since the base plate 10 is flat, when the base plate 10 and the end plate 300 are fixed, it is necessary to add auxiliary connecting parts on the upper side of the base plate 10, such as a cross-shaped support part, so that the bottom of the end plate 300 and the top of the support part are abutted, and the battery cell 210 is placed on the base plate 10, so that there is a certain height difference between the bottom of the battery cell 210 and the bottom of the end plate 300. The disadvantage of this is that the expansion force generated by the bottom of the battery cell 210 cannot be resisted by the end plate 300, resulting in uneven force on the upper and lower parts of the battery cell 210, thereby affecting the life of the battery cell 210.

[0053] To address the above issues, the end plate 300 is placed on the support protrusion 11, and the height of the end plate 300 is greater than or equal to the height of the battery cell 210. This arrangement ensures that the bottom of the end plate 300 is flush with the bottom of the battery cell 210, and the projection of the end plate 300 in the first direction fully covers the battery cell 210, ensuring uniform force over a large surface of the battery cell 210 and extending the service life of the battery cell 210.

[0054] In the prior art, the heat dissipation of the battery cell 210 is mostly done through side heat dissipation, but the bottom of the battery cell 210 is not promptly and effectively dissipated, causing heat to accumulate at the bottom of the battery cell 210 , resulting in a high local temperature and affecting the service life of the battery cell 210 .

[0055] In order to solve the above problems, Figure 1 and Figure 5 As shown, in the battery pack case 100 of this embodiment, the bottom plate 10 is provided with an inwardly projecting support protrusion 11, which is used to support the battery cell 210. The top of the support protrusion 11 defines an air duct groove 111, and opposite sides of the support protrusion 11 define an air inlet 112 and an air outlet 113, which communicate with the air duct groove 111. It is understood that the bottom plate 10 includes a body 12 and the aforementioned support protrusion 11, and the support protrusion 11 is provided protruding above the body 12.

[0056] The above-mentioned battery pack case 100 supports the battery cell 210 through the supporting protrusion 11. The air duct groove 111 is located below the battery cell assembly 200. The wind enters from the air inlet 112, passes through the bottom of the battery cell 210, takes away the heat at the bottom of the battery cell 210 in time, and discharges it to the outside of the battery pack from the air outlet 113, preventing the temperature at the bottom of the battery cell 210 from being too high, thereby extending the service life of the battery cell 210.

[0057] The battery pack of this embodiment adopts the battery pack case 100 , so that the bottom of the battery cell 210 can dissipate heat promptly and effectively, thereby extending the service life of the battery cell 210 and further extending the service life of the entire battery pack.

[0058] It should be noted that the bottom heat dissipation method in this embodiment can be used in combination with the side heat dissipation method of the prior art to ensure the synchronization and uniformity of the heat dissipation of the battery cell 210 as a whole. The side heat dissipation method is a prior art and will not be described in detail here.

[0059] Alternatively, as Figure 5 As shown, the support protrusion 11 and the air duct groove 111 both extend in a first direction, and the air inlet 112 and the air outlet 113 are arranged on opposite sides of the support protrusion 11 along the first direction. With this arrangement, air enters from the air inlet 112 and reaches the air outlet 113 via a longer path, and the air path is relatively narrow, which helps to increase the air speed and achieve a better cooling effect.

[0060] That is to say, the air inlet 112 and the air outlet 113 of this embodiment are arranged at both ends of the support protrusion 11 in the length direction. In another embodiment, the air inlet 112 and the air outlet 113 can also be arranged at both ends of the support protrusion 11 in the width direction, which is not limited here.

[0061] Alternatively, as Figure 5 As shown, the air inlet 112 is oblong, with at least two air inlets 112 provided on each side, and the at least two air inlets 112 are spaced apart along the second direction; the air outlet 113 is oblong, with at least two air outlets 113 provided on each side, and the at least two air outlets 113 are spaced apart along the second direction. Specifically, the air inlet 112 and the air outlet 113 both extend along the second direction (the Y direction in the figure, which is perpendicular to the X direction and the Y direction, respectively). Compared to providing only one air outlet 113 or one air inlet 112, this arrangement appropriately reduces the air inlet and outlet areas, which is more conducive to increasing wind speed.

[0062] Optionally, the support protrusions 11 and the air duct grooves 111 are formed by a stamping process. This arrangement ensures that the thickness of the bottom plate 10 after forming is uniform, preventing the occurrence of local excessive thickness or local excessive thinness, thereby achieving both lightweight design and structural strength requirements of the battery pack box 100.

[0063] Optionally, at least two supporting protrusions 11 are arranged at intervals in the second direction to support at least two battery cell assemblies 200 .

[0064] It should be noted that if Figure 2 As shown, the air inlet 112 and the air outlet 113 are arranged to avoid the accommodating groove 13.

[0065] Alternatively, as Figure 3 and Figure 4 As shown, the receiving groove 13 is annular and is staggered with the air duct groove 111 on the other side. In this embodiment, since the base plate 10 is stamped, the receiving groove 13 and the air duct groove 111 are naturally staggered, ensuring that the material thickness of the base plate 10 is basically consistent. In other embodiments, if the base plate 10 is formed by other processes, such as turning, the receiving groove 13 and the air duct groove 111 can also be obtained through processing. In addition, the receiving groove 13 and the air duct groove 111 are staggered so that the upper part of the receiving groove 13 corresponds to the position where the end plate 300 is placed, thereby ensuring the precise connection of the screw 410.

[0066] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery cell assembly (200) comprising a plurality of arranged battery cells (210); A battery pack case (100), the battery pack case (100) comprising a bottom plate (10), the bottom plate (10) being provided with a supporting protrusion (11) integral with the bottom plate (10) and protruding inwardly, the battery cell assembly (200) being supported on the supporting protrusion (11); End plates (300), each of the battery cell components (200) is provided with the end plates (300) at both ends along the first direction, and the end plates (300) are fixed to the supporting protrusions (11).

2. The battery pack according to claim 1, wherein: A receiving groove (13) is formed on the back side of the supporting protrusion (11); The battery pack further includes a connecting assembly (400), the connecting assembly (400) including a screw (410) and a locking member (420), the screw (410) sequentially passing through the end plate (300) and the bottom plate (10) along a third direction, the locking member (420) being threadedly connected to the screw (410) to lock the end plate (300) and the screw (410), the locking member (420) being located in the accommodating groove (13), and the third direction being perpendicular to the first direction.

3. The battery pack according to claim 2, wherein: The locking member (420) is welded to the base plate (10).

4. The battery pack according to claim 2, wherein: The screw (410) comprises: The rod portion (411) is sequentially passed through the end plate (300) and the bottom plate (10); The limiting portion (412) is connected to one end of the rod (411) and abuts against the top of the end plate (300), the other end of the rod (411) is located in the accommodating groove (13), and the locking member (420) is threadedly connected to the other end of the rod (411).

5. The battery pack according to any one of claims 1 to 4, characterized in that: The end plate (300) is placed on the supporting protrusion (11), and the height of the end plate (300) is greater than or equal to the height of the battery core (210).

6. The battery pack according to any one of claims 2 to 4, characterized in that: An air duct groove (111) is provided at the top of the support protrusion (11), and an air inlet (112) and an air outlet (113) communicating with the air duct groove (111) are respectively provided on opposite sides of the support protrusion (11).

7. The battery pack according to claim 6, characterized in that: The supporting protrusion (11) and the air duct groove (111) both extend along the first direction, and the air inlet (112) and the air outlet (113) are arranged on two opposite sides of the supporting protrusion (11) along the first direction.

8. The battery pack according to claim 7, characterized in that: At least two supporting protrusions (11) are arranged at intervals in a second direction, and the second direction is respectively perpendicular to the first direction.

9. The battery pack according to claim 7, characterized in that: The air inlet (112) is in an oblong shape, and at least two air inlets (112) are provided on each side, and the at least two air inlets (112) are spaced apart along the second direction; and / or The air outlet (113) is in an oblong shape, and at least two air outlets (113) are provided on each side, and the at least two air outlets (113) are spaced apart along the second direction; The second directions are respectively perpendicular to the first directions.

10. The battery pack according to claim 6, wherein: The supporting protrusion (11) and the air duct groove (111) are formed by a stamping process.

11. The battery pack according to claim 6, characterized in that: The accommodating groove (13) is annular and is staggered with the air duct groove (111) on the other side.

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