Battery pack box body and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack box body and a battery pack. The battery pack box comprises a box body and a box cover, the box cover is in sealed connection with the box body to seal an opening of the box body, a bottom plate is arranged on the side, away from the box cover, of the box body and used for supporting a battery cell, an air channel groove is formed in the top wall, close to the box cover, of the bottom plate, and an air inlet and an air outlet communicated with the air channel groove are formed in the side wall of the bottom plate. The battery pack comprises the battery pack box body, the battery pack box body and the battery pack, the battery cells are supported by the protrusions, the air duct grooves are located below the battery cell assembly, air enters from the air inlets, passes through the bottoms of the battery cells, takes away heat at the bottoms of the battery cells in time and is discharged out of the battery pack from the air outlets, the temperature of the bottoms of the battery cells is prevented from being too high, and the service life of the battery pack is prolonged. And the service life of the battery cell is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery package box and battery package. BACKGROUND

[0002] It is known that the use and operating temperature of the battery cell in the battery package has an important influence on the service life of the whole battery package.

[0003] The traditional air-cooled battery package adopts the mode of installing a fan outside the battery package and simultaneously opening the air inlet on the side, and the mode has the defect that only the side of the battery cell can be cooled, and the heat at the bottom of the battery cell cannot be dissipated in time, resulting in heat accumulation at the bottom of the battery cell, thereby affecting the service life of the battery cell.

[0004] Therefore, it is urgent to design a battery package box and a battery package to solve the above problems. UTILITY MODEL CONTENTS

[0005] One purpose of the utility model is to provide a battery package box which can cool the bottom of the battery cell, ensure uniform cooling of the battery cell, and prolong the service life of the battery cell.

[0006] Another purpose of the utility model is to provide a battery package with better cooling effect and longer service life of the battery cell.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The battery package box comprises a box body and a box cover, the box cover is sealingly connected with the box body to close the opening of the box body, the side of the box body away from the box cover is provided with a bottom plate, the bottom plate is used for supporting the battery cell, the top wall of the bottom plate close to the box cover is provided with an air duct groove, and the side wall of the bottom plate is provided with an air inlet and an air outlet which are in communication with the air duct groove.

[0009] As an optional solution, the bottom plate is inwardly provided with a supporting protrusion, the top of the supporting protrusion is the top wall of the bottom plate close to the box cover, and the side wall of the supporting protrusion is provided with the air inlet and the air outlet.

[0010] As an optional solution, the supporting protrusion and the air duct groove both extend along a first direction, and the air inlet and the air outlet are arranged on the two sides of the supporting protrusion opposite to each other along the first direction.

[0011] As an optional solution, the supporting protrusion is spaced apart from at least two in a second direction, and the second direction is perpendicular to the first direction.

[0012] As an optional scheme, the air inlet is an oblong shape, and at least two air inlets are arranged on each side, and the at least two air inlets are arranged in the second direction; and / or

[0013] The air outlet is an oblong shape, and at least two air outlets are arranged on each side, and the at least two air outlets are arranged in the second direction.

[0014] As an optional scheme, the support protrusion and the air duct groove are formed by a stamping process.

[0015] The battery pack comprises:

[0016] The battery pack box body;

[0017] The cell assembly comprises a plurality of cells arranged side by side in the first direction, and the bottom plate supports the plurality of cells on the upper side of the air duct groove.

[0018] As an optional scheme, the support protrusion and the bottom plate are integrally arranged, the back side of the support protrusion forms a receiving groove, and the battery pack further comprises:

[0019] The end plate is arranged at both ends of each cell assembly in the first direction.

[0020] The connecting assembly comprises a screw rod and a locking piece, the screw rod sequentially penetrates the end plate and the bottom plate in the third direction, the locking piece is threadedly connected with the screw rod to lock the end plate and the screw rod, and the locking piece is located in the receiving groove.

[0021] As an optional scheme, the receiving groove is an annular shape, and is arranged in a staggered manner with the air duct groove on the other side.

[0022] As an optional scheme, the end plate is arranged on the support protrusion, and the height of the end plate is greater than or equal to the height of the cell.

[0023] As an optional scheme, the locking piece is welded to the bottom plate.

[0024] The battery pack has the advantages that:

[0025] The battery pack box body is provided, the cell is supported by the support protrusion, the air duct groove is located below the cell assembly, air enters from the air inlet, passes through the bottom of the cell, timely removes the heat of the bottom of the cell, and is discharged from the air outlet to the outside of the battery pack, so that the temperature of the bottom of the cell is prevented from being too high, and the service life of the cell is prolonged.

[0026] The utility model also provides a battery pack, through adopt above-mentioned battery pack box, the bottom of electric core can obtain in time effective heat dissipation, prolong the service life of electric core, and then prolong the service life of whole battery pack. BRIEF DESCRIPTION OF DRAWINGS

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

[0028] Figure 2 is the structural schematic diagram of the battery pack box provided by the utility model embodiment;

[0029] Figure 3 is the sectional view of the battery pack at the position of air inlet and air outlet provided by the utility model embodiment;

[0030] Figure 4 is the sectional view of the battery pack at the position of end plate and connecting assembly provided by the utility model embodiment;

[0031] Figure 5 is the sectional view of the battery pack at the position of electric core provided by the utility model embodiment.

[0032] In the drawings:

[0033] 100, battery pack box;

[0034] 10, bottom plate; 11, support protrusion; 111, air duct groove; 112, air inlet; 113, air outlet; 12, body; 13, containing groove;

[0035] 20, side plate;

[0036] 200, electric core assembly; 210, electric core;

[0037] 300, end plate;

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

[0039] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the utility model, and not limit the utility model. In addition, it needs to be explained that in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0040] In the description of the utility model, unless another definite provision and limitation, the term "link", "connection", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's interaction relationship.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0041] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature horizontal height is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature horizontal height is less than the second feature.

[0042] In the description of the embodiment, the terms "on", "under", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0043] As Figure 1 As shown in the utility model provides a kind of battery pack, battery pack includes battery pack box 100 and the battery core subassembly 200 placed in battery pack box 100, each battery core subassembly 200 includes multiple side-by-side arrangement of battery core 210 along the first direction (the X direction in drawing), specifically, battery core subassembly 200 is placed on the bottom plate 10 of battery pack box 100, battery pack box 100 also includes box body and box cover (not shown in drawing), box cover is sealed with box body Connection to close the opening of box body, bottom plate 10 is one wall plate of box body away from box cover, Figure 1 In the utility model, in order to facilitate the structure of the inside of the box body to be shown, two side plates 20 in the box body are exemplarily illustrated, and the two side plates 20 are respectively connected perpendicularly to the two side edges of the bottom plate 10.

[0044] In the prior art, the heat dissipation of the battery core 210 is mainly achieved by the side surface, and the bottom of the battery core 210 is not effectively cooled in time, causing the heat to accumulate at the bottom of the battery core 210 and the local temperature to be relatively high, thereby affecting the service life of the battery core 210.

[0045] To solve the above problems, as shown in Figure 1 and Figure 2 , the embodiment provides a battery pack box 100, wherein the bottom plate 10 is used for supporting the battery cell 210, the bottom plate 10 is provided with an air duct groove 111 near the top wall of the box cover, and the side wall of the bottom plate 10 is provided with an air inlet 112 and an air outlet 113 which are in communication with the air duct groove 111. The above-mentioned battery pack box 100 is provided with the air duct groove 111 on the top wall of the bottom plate 10, the air duct groove 111 is located below the battery cell assembly 200, air enters from the air inlet 112, passes through the bottom of the battery cell 210, timely takes away the heat at the bottom of the battery cell 210, and is discharged to the outside of the battery pack from the air outlet 113, so as to prevent the temperature at the bottom of the battery cell 210 from being too high and prolong the service life of the battery cell 210.

[0046] Optionally, as shown in Figure 1 and Figure 2 , the bottom plate 10 is inwardly provided with a support protrusion 11, the support protrusion 11 is used for supporting the battery cell 210, the top of the support protrusion 11 is the top wall of the bottom plate 10 near the box cover, and it can be understood that the support protrusion 11 is provided with the air duct groove 111 at the top, and the air inlet 112 and the air outlet 113 which are in communication with the air duct groove 111 are respectively provided on the two sides of the support protrusion 11. It can be understood that the bottom plate 10 comprises a body 12 and the above-mentioned support protrusion 11, and the support protrusion 11 is protruded on the body 12.

[0047] The above-mentioned battery pack box 100 supports the battery cell 210 through the support protrusion 11, and the air duct groove 111 can be conveniently provided. It should be noted that the bottom heat dissipation mode in the embodiment can be used in combination with the side heat dissipation mode of the prior art to ensure the synchronism and uniformity of the overall heat dissipation of the battery cell 210, and the side heat dissipation mode is the prior art, which will not be described here.

[0048] Optionally, as shown in Figure 2 , the support protrusion 11 and the air duct groove 111 extend along the first direction, and the air inlet 112 and the air outlet 113 are arranged on the opposite sides of the support protrusion 11 along the first direction. Through the above-mentioned arrangement, air enters from the air inlet 112, passes through a relatively long path to reach the air outlet 113, and the air path is relatively narrow, which is helpful to improve the wind speed and the air cooling effect is better.

[0049] That is, the air inlet 112 and the air outlet 113 of the embodiment are arranged at the two ends of the length direction of the support protrusion 11, and in another embodiment, the air inlet 112 and the air outlet 113 can also be arranged at the two ends of the width direction of the support protrusion 11, which is not limited here.

[0050] In another embodiment, the air inlet 112 and the air outlet 113 can also be arranged without being directly opposite, which is not limited here.

[0051] Optionally, such as Figure 2 As shown, the air inlet 112 is oblong, and at least two air inlets 112 are provided on each side, with the at least two air inlets 112 spaced apart along the second direction; the air outlet 113 is oblong, and at least two air outlets 113 are provided on each side, with the at least two air outlets 113 spaced apart along the second direction. Specifically, both the air inlet 112 and the air outlet 113 extend along the second direction (the Y direction in the figure, which is perpendicular to the X direction). Compared to providing one air outlet 113 or one air inlet 112, this arrangement appropriately reduces the area of ​​air intake and exhaust, which is more conducive to increasing the wind speed.

[0052] Optionally, the support protrusion 11 and the air duct groove 111 are formed by stamping. This ensures that the thickness of the bottom plate 10 is consistent throughout after forming, preventing local over-thickness or under-thinness, thus satisfying both lightweight design and the structural strength requirements of the battery pack housing 100.

[0053] In other embodiments, the support protrusion 11 may be separately disposed from the base plate 10, which is not limited here.

[0054] Optionally, at least two support protrusions 11 are spaced apart in the second direction to accommodate supporting at least two cell assemblies 200.

[0055] In this embodiment, by adopting the battery pack housing 100, the bottom of the battery cell 210 can be effectively and timely cooled, extending the service life of the battery cell 210 and thus extending the service life of the entire battery pack.

[0056] Because the battery cell 210 will expand to a certain extent after working for a long time, end plates 300 need to be added to 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 weld an additional bracket to fix the end plate 300 on the battery pack housing 100. The disadvantage of this is that during the transportation and vibration of the battery pack, the bracket is often not firmly welded to the battery pack housing 100, which leads to unstable module fixation. In addition, the insufficient strength of the module bracket material and thickness also causes the module to deform and shake during transportation, which greatly affects the safety and stability coefficient of the battery pack.

[0057] To address the above problems, in this embodiment, as follows: Figure 3 and Figure 4As shown, the support protrusion 11 and the bottom plate 10 are integrally arranged, the back side of the support protrusion 11 forms a containing groove 13, the battery pack further comprises a connecting assembly 400 on the basis of the end plate 300, the connecting assembly 400 comprises a screw rod 410 and a locking piece 420, the screw rod 410 is sequentially provided through the end plate 300 and the bottom plate 10 along a third direction (the Z direction in the figure, the Z direction is perpendicular to the X direction and the Y direction respectively), the locking piece 420 is threadedly connected with the screw rod 410 to lock the end plate 300 and the screw rod 410, and the locking piece 420 is located in the containing groove 13. Through the above arrangement, when the end plate 300 is fixed, the screw rod 410 is provided through the end plate 300 and the bottom plate 10, and the locking piece 420 is connected, the locking piece 420 is located in the containing groove 13, and the flatness of the lower side of the bottom plate 10 is not affected, the connecting mode does not need to weld a support on the battery pack box body 100, and the problem that the internal structure of the traditional battery pack is unstable during transportation and vibration due to insufficient connection strength between the fixing support and the box body is solved.

[0058] Optionally, as shown in Figure 4 The screw rod 410 comprises a rod portion 411 and a limiting portion 412, the rod portion 411 is sequentially provided through the end plate 300 and the bottom plate 10, the limiting portion 412 is connected to one end of the rod portion 411 and abuts against the top of the end plate 300, and the other end of the rod portion 411 is located in the containing groove 13, and the locking piece 420 is threadedly connected with the other end of the rod portion 411. Through the above arrangement, the locking piece 420 abuts against the top of the end plate 300, the locking piece 420 abuts against the groove bottom of the containing groove 13, and the end plate 300 is locked and fixed.

[0059] Optionally, the locking piece 420 is a nut. In other embodiments, the rod portion 411 can also be provided with a clamping groove, and the locking piece 420 is a clamping piece, which can also achieve locking, and is not limited here.

[0060] Optionally, the locking piece 420 is welded to the bottom plate 10. Through the above arrangement, when the screw rod 410 is installed, the screw rod 410 is threadedly connected with the locking piece 420 by screwing, which prevents the locking piece 420 from being taken from elsewhere during connection, and prevents the inconvenience of operation from the bottom.

[0061] It should be noted that, as shown in Figure 3 The air inlet 112 and the air outlet 113 are arranged to avoid the containing groove 13.

[0062] Optionally, each end plate 300 is provided with two connecting assemblies 400, so as to ensure the balance of the force received by the end plate 300.

[0063] Optionally, as shown in Figure 4 and Figure 5As shown, the accommodating groove 13 is annular and is arranged staggered with the air duct groove 111 on the other side. In the embodiment, since the bottom plate 10 is stamped and formed, the accommodating groove 13 and the air duct groove 111 are naturally arranged staggered, so as to ensure that the thickness of the bottom plate 10 is basically consistent. In other embodiments, for example, the bottom plate 10 is formed by other processes, such as turning, etc., the accommodating groove 13 and the air duct groove 111 can also be obtained by machining. In addition, the accommodating groove 13 and the air duct groove 111 are arranged staggered, so that the upper part of the accommodating groove 13 corresponds to the position where the end plate 300 is placed, so as to ensure the accurate connection of the screw rod 410.

[0064] In the prior art, since the bottom plate 10 is flat, when the bottom plate 10 and the end plate 300 are fixed, an auxiliary connecting piece, such as a few-shaped support, etc., needs to be added on the upper side of the bottom plate 10, the bottom of the end plate 300 and the top of the support abut, and the electric core 210 is placed on the bottom plate 10, so that the bottom of the electric core 210 and the bottom of the end plate 300 have a certain height difference. The disadvantage of this is that the expansion force generated at the bottom of the electric core 210 cannot be resisted by the end plate 300, resulting in uneven force on the electric core 210, thereby affecting the service life of the electric core 210.

[0065] In order to solve the above problems, 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 electric core 210. By this arrangement, the bottom of the end plate 300 is flush with the bottom of the electric core 210, and the projection of the end plate 300 in the first direction can fully cover the electric core 210, so that the electric core 210 is uniformly stressed on a large surface, thereby prolonging the service life of the electric core 210.

[0066] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A battery pack housing, characterized in that, The device includes a housing and a lid. The lid is sealed to the housing to close the opening of the housing. The housing has a base plate (10) on the side away from the lid. The base plate (10) is used to support the battery cell (210). The base plate (10) has an air duct groove (111) on its top wall near the lid. The side wall of the base plate (10) has an air inlet (112) and an air outlet (113) that communicate with the air duct groove (111).

2. The battery pack housing (100) according to claim 1, characterized in that, The base plate (10) has an inwardly protruding support protrusion (11), the top of which is the top wall of the base plate (10) near the box cover, and the side wall of the support protrusion (11) has the air inlet (112) and the air outlet (113).

3. The battery pack housing according to claim 2, characterized in that, The support 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 disposed on opposite sides of the support protrusion (11) along the first direction.

4. The battery pack housing according to claim 3, characterized in that, The support protrusions (11) are provided at least two at intervals in a second direction, which is perpendicular to the first direction.

5. The battery pack housing according to claim 1, characterized in that, The air inlet (112) is oblong, and at least two air inlets (112) are provided on each side, with at least two air inlets (112) spaced apart along the second direction; and / or The air outlet (113) is oblong, and at least two air outlets (113) are provided on each side, with at least two air outlets (113) spaced apart along the second direction.

6. The battery pack housing according to any one of claims 2-4, characterized in that, The support protrusion (11) and the air duct groove (111) are formed by stamping process.

7. A battery pack, characterized in that, include: Battery pack housing as described in any one of claims 2-4; The battery cell assembly (200) includes a plurality of battery cells (210) arranged side by side along a first direction, and the base plate (10) is located on the upper side of the air duct groove (111) and supports the plurality of battery cells (210).

8. The battery pack according to claim 7, characterized in that, The support protrusion (11) and the base plate (10) are integrally formed, and the back side of the support protrusion (11) forms a receiving groove (13). The battery pack also includes: End plates (300), each of the battery cell assemblies (200) is provided with end plates (300) at both ends along the first direction; The connecting assembly (400) includes a screw (410) and a locking member (420), wherein the screw (410) passes through the end plate (300) and the base plate (10) in a third direction, and the locking member (420) is threadedly connected to the screw (410) to lock the end plate (300) and the screw (410), and the locking member (420) is located in the receiving groove (13).

9. The battery pack according to claim 8, characterized in that, The receiving groove (13) is annular and is offset from the air duct groove (111) on the other side.

10. The battery pack according to claim 8, characterized in that, 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).

11. The battery pack according to claim 8, characterized in that, The locking member (420) is welded to the base plate (10).

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