Battery pack and electric equipment

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery pack and electric equipment, the battery pack comprises battery monomer components, a box body and a cold plate, the box body comprises edge beams and middle beams, the edge beams and the middle beams define a plurality of accommodating cavities, the battery monomer components are arranged in the accommodating cavities, and the cold plate is arranged below the box body. In the stacking direction of the box body and the cold plate, the battery pack further comprises a connecting plate arranged between the box body and the cold plate, the connecting plate is connected with the box body and the cold plate, a first groove is formed between the bottom of the box body and the cold plate, and at least part of the connecting plate is arranged in the first groove. According to the utility model, the stress at the joint of the box body and the cold plate can be reduced, and the structural safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, specifically providing a battery pack and electrical equipment. Background Technology

[0002] With the popularization of new energy vehicles, lithium batteries are being used more and more commonly. Typically, many individual lithium batteries are connected in series to form a battery string, and then connected in parallel to form a large battery pack. Current power battery pack technology has revealed a problem: under extreme vibration and impact conditions, the connection between the cold plate and the frame of the battery pack can experience significant stress and localized stress concentration. This can easily lead to deformation of the cold plate and frame, thus affecting the structural safety of the battery pack.

[0003] Therefore, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0004] The present invention aims to solve the above-mentioned technical problems and provide a new type of battery pack that can reduce the stress at the connection between the casing and the cold plate and improve the structural safety.

[0005] This utility model provides a battery pack, comprising:

[0006] Battery cell assembly;

[0007] The housing includes side beams and a middle beam, which enclose multiple receiving cavities, and the battery cell assembly is disposed within the receiving cavities.

[0008] Cold plate, located below the casing;

[0009] In the stacking direction of the housing and the cold plate, the battery pack further includes a connecting plate disposed between the housing and the cold plate, the connecting plate connecting the housing and the cold plate, a first groove is provided between the bottom of the housing and the cold plate, and the connecting plate is at least partially disposed in the first groove.

[0010] In the above-mentioned technical solution, in the stacking direction of the housing and the cold plate, a connecting plate is provided between the housing and the cold plate. At the connection between the housing and the cold plate, since the cold plate bears the weight load of the battery cell assembly, deformation of the cold plate can be avoided under extreme conditions of vibration and impact. The setting of the connecting plate can increase the strength of the connection between the housing and the cold plate. In addition, the setting of the connecting plate can improve the problem of local stress concentration. At the same time, a first groove is set on the housing, and the connecting plate is set in the first groove, which can not only increase the strength of the connection, but also reduce the overall space occupied by the battery pack, thereby reducing the size of the battery pack and improving the energy per unit volume of the battery pack.

[0011] In the preferred embodiment of the above-mentioned battery pack, the side beam includes a first main body, a second main body, and a protrusion, wherein the second main body is disposed away from the battery cell assembly, and the protrusion is disposed close to the battery cell assembly.

[0012] When the above technical solution is adopted, the side beam is provided with a first main body, a second main body and a protrusion, which can not only increase the overall structural strength of the side beam, but also prevent the connecting plate from deforming under stress and increase the strength of the connection, thus improving the problem of local stress concentration.

[0013] In the preferred embodiment of the battery pack described above, the height of the protrusion gradually decreases in the direction away from the first body.

[0014] When the above technical solution is adopted, the height of the protrusion gradually decreases in the direction away from the first main body, that is, the protrusion is inclined. The part away from the first main body is relatively weak and has less rigidity. When the cold plate is subjected to vibration and impact, the impact will be transmitted to the side beam. The inclined protrusion will not damage the first main body or the second main body, and thus will not affect the overall structure of the side beam.

[0015] In the preferred embodiment of the above-mentioned battery pack, the height of the protrusion accounts for 1 / 5 to 1 / 2 of the height of the first main body.

[0016] When the above technical solution is adopted, the protrusion is set at a high height. When the side beam is impacted, the side beam will be squeezed and deformed towards the battery cell, which will cause the protrusion to squeeze the battery cell, causing the battery cell to fail and affecting the safety of the battery pack. On the other hand, if the protrusion is set at a low height, it will not play a role in strengthening the connecting plate and will not be able to solve the problem of local stress concentration.

[0017] In the preferred embodiment of the above-mentioned battery pack, the protrusion includes a bottom surface and an inclined surface disposed between the bottom surface and the first body, and a second groove is provided on the inclined surface.

[0018] When the above technical solution is adopted, a second groove is provided on the inclined surface of the protrusion. When the side beam is subjected to a large force, some of the stress can be released through the second groove, so as not to damage the side beam and thus affect the safety and service life of the battery pack.

[0019] In the preferred embodiment of the above-mentioned battery pack, the bottom surface of the protrusion and the cold plate surround to form the first groove.

[0020] When the above technical solution is adopted, the first groove formed by the bottom surface of the protrusion and the cold plate can not only accommodate the thickness of the connecting plate, but also bond the bottom surface of the protrusion to the connecting plate with adhesive, thereby improving the problem of local stress concentration.

[0021] In the preferred embodiment of the above-mentioned battery pack, the projection of the connecting plate in the horizontal direction partially overlaps with the battery cell assembly.

[0022] When the above technical solution is adopted, the connecting plate is located below the battery cell assembly, which can not only increase the strength of the connection between the cold plate and the battery cell assembly, but also increase the strength of the connection between the battery cell assembly and the side beam.

[0023] In the preferred embodiment of the above-mentioned battery pack, the connecting plate is bonded to the overlapping area of ​​the horizontal projection of the battery cell assembly, the connecting plate is bonded to the bottom surface of the protrusion, and the connecting plate is bonded to the cold plate.

[0024] With the above technical solution, the connecting plate is bonded to the battery cell assembly, to the bottom of the protrusion, and to the cold plate. This configuration can connect the connecting plate, the cold plate, the battery cell assembly, and the side beam into a whole. When subjected to vibration and impact, it can increase the strength of the connection between the cold plate, the battery cell assembly, and the side beam, and improve the stress concentration problem at the edge of the cold plate and the connection.

[0025] In the preferred embodiment of the above-mentioned battery pack, the connecting plate is disposed between the battery cell assembly and the side beam. The projection of the connecting plate in the horizontal direction partially overlaps with both the battery cell assembly and the housing. There are multiple connecting plates, corresponding to the number of the receiving cavities.

[0026] When the above technical solution is adopted, the connecting plate is set at the connection between the battery cell assembly and the housing, that is, at the edge of the cold plate. This can prevent the cold plate from deforming when subjected to vibration and impact, and improve the stress concentration problem at this location.

[0027] In a second aspect, the present invention provides an electrical device including the battery pack described in the second aspect. Attached Figure Description

[0028] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0029] Figure 1 This is a schematic diagram of the battery pack structure of this utility model;

[0030] Figure 2 This is a cross-sectional schematic diagram of the battery pack of this utility model;

[0031] Figure 3 This is a cross-sectional schematic diagram of the side beam of the battery pack of this utility model;

[0032] Figure 4 This is a partially enlarged cross-sectional view of the protrusion of this utility model.

[0033] Figure label:

[0034] 1. Box body; 11. Side beam; 111. First main body; 112. Second main body; 113. Protrusion; 1131. Bottom surface; 1132. Inclined surface; 1133. Second groove; 12. Intermediate beam; 13. Receiving cavity;

[0035] 2. Battery cell modules;

[0036] 3. Cold-rolled steel plate;

[0037] 4. Connecting plate;

[0038] 5. First groove. Detailed Implementation

[0039] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0040] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "connection," "setting," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] like Figures 1 to 4 As shown, in the first aspect, the battery pack of this utility model includes a battery cell assembly 2, a housing 1, and a cold plate 3. The housing 1 includes a side beam 11 and a middle beam 12, which form a plurality of receiving cavities 13. The battery cell assembly 2 is disposed in the receiving cavity 13, and the cold plate 3 is disposed below the housing 1. In the stacking direction of the housing 1 and the cold plate 3, the battery pack also includes a connecting plate 4 disposed between the housing 1 and the cold plate 3. The connecting plate 4 connects the housing 1 and the cold plate 3. A first groove 5 is provided between the bottom of the housing 1 and the cold plate 3, and the connecting plate 4 is at least partially disposed in the first groove 5.

[0043] The battery pack of this utility model has a connecting plate 4 between the housing 1 and the cold plate 3. At the connection between the housing 1 and the cold plate 3, since the cold plate 3 bears the weight load of the battery cell assembly 2, it can avoid deformation of the cold plate 3 under extreme conditions of vibration and impact. The setting of the connecting plate 4 can increase the strength of the connection between the housing 1 and the cold plate 3. In addition, the setting of the connecting plate 4 can improve the problem of local stress concentration. At the same time, a first groove 5 is set on the housing 1, and the connecting plate 4 is set in the first groove 5. This can not only increase the connection strength, but also reduce the overall space occupied by the battery pack, thereby reducing the size of the battery pack and improving the energy per unit volume of the battery pack.

[0044] like Figures 1 to 2 As shown, the side beam 11 of this utility model includes a first main body 111, a second main body 112, and a protrusion 113. The second main body 112 is located away from the battery cell assembly 2, and the protrusion 113 is located close to the battery cell assembly 2. The side beam 11, with its first main body 111, second main body 112, and protrusion 113, not only increases the overall structural strength of the side beam 11, but also, the protrusion 113 connects to the connecting plate 4, preventing the connecting plate 4 from deforming under stress and increasing the strength of the connection, thus improving the problem of local stress concentration. In this embodiment, the side beam 11 includes two die-cast parts (unlabeled) arranged along the vehicle body direction and a profile part (unlabeled) connecting the two die-cast parts. The battery cell assembly 2 includes multiple battery cells arranged along the direction of the die-cast parts. The connecting plate 4 is located between the profile and the battery cell assembly 2, and the connecting plate 4 is spaced apart along the direction of the die-cast parts.

[0045] like Figures 3 to 4 As shown, the height of the protrusion 113 gradually decreases in the direction away from the first main body 111, meaning the protrusion 113 is inclined. The area away from the first main body 111 is relatively weak and has lower rigidity. When the cold plate 3 is subjected to vibration and impact, the impact will be transmitted to the side beam 11. The inclined protrusion 113 will not damage the first main body 111 or the second main body 112, thus not affecting the overall structure of the side beam 11. The height of the protrusion 113 is 1 / 5 to 1 / 2 of the height of the first main body 111. If the protrusion 113 is set too high, when the side beam 11 is impacted from the side, the side beam 11 will be squeezed and deformed towards the battery cell, causing the protrusion 113 to squeeze the battery cell, resulting in battery cell failure and affecting the safety of the battery pack. If the protrusion 113 is set too low, it will not strengthen the connecting plate 4 and cannot effectively solve the problem of local stress concentration.

[0046] like Figure 4As shown, the protrusion 113 is roughly triangular in shape. The protrusion 113 includes a bottom surface 1131 and an inclined surface 1132 located between the bottom surface 1131 and the first main body 111. A second groove 1133 is provided on the inclined surface 1132 of the protrusion 113. When the side beam 11 is under significant stress, some stress can be released through the second groove 1133, preventing damage to the side beam 11 and thus affecting the safety and lifespan of the battery pack. The bottom surface 1131 of the protrusion 113 and the cold plate 3 form a first groove 5, which not only accommodates the thickness of the connecting plate 4 but also allows the bottom surface 1131 of the protrusion 113 to be bonded to the connecting plate 4 using adhesive, thus improving the problem of localized stress concentration.

[0047] like Figures 2 to 4 As shown, the horizontal projection of the connecting plate 4 partially overlaps with the battery cell assembly 2, and the connecting plate 4 is partially located below the battery cell assembly 2. This not only increases the strength of the connection between the cold plate 3 and the battery cell assembly 2, but also increases the strength of the connection between the battery cell assembly 2 and the side beam 11. The overlapping area of ​​the horizontal projection of the connecting plate 4 and the battery cell assembly 2 is bonded together. The connecting plate 4 is bonded to the bottom surface 1131 of the protrusion 113, the cold plate 3, the battery cell assembly 2, the bottom surface 1131 of the protrusion 113, and the cold plate 3. This arrangement connects the connecting plate 4, the cold plate 3, the battery cell assembly 2, and the side beam 11 into a whole. When subjected to vibration and impact, this increases the strength of the connection between the cold plate 3, the battery cell assembly 2, and the side beam 11, and improves the stress concentration problem at the edge and connection of the cold plate 3. In this embodiment, the connecting plate 4 and the cold plate 3 can be bonded with structural adhesive or with double adhesive. The connecting plate 4 and the battery cell can be bonded with structural adhesive or double-sided adhesive. The connecting plate 4 and the bottom surface 1131 of the protrusion 113 can be bonded with structural adhesive or double-sided adhesive.

[0048] like Figures 1 to 2 As shown, the connecting plate 4 is horizontally positioned between the battery cell assembly 2 and the side beam 11. The horizontal projection of the connecting plate 4 partially overlaps with both the battery cell assembly 2 and the housing 1. Multiple connecting plates 4 are present, corresponding to the number of receiving cavities 13. The connecting plates 4 are positioned at the connection between the battery cell assembly 2 and the housing 1, i.e., at the edge of the cold plate 3, to prevent deformation of the cold plate 3 under vibration and impact, thus mitigating stress concentration at this location. In this embodiment, the width of the connecting plate 4 is 5mm to 10mm, preferably 8mm. The thickness of the connecting plate 4 is 0.5mm to 1.2mm, preferably 1mm.

[0049] In a second aspect, the electrical device of this utility model includes the battery pack of the first aspect. The electrical device of this technical solution includes the battery pack of any technical solution of this utility model, and therefore possesses all the technical effects of the battery pack of any technical solution of this utility model.

[0050] It should be noted that the above preferred embodiments are merely illustrative of the principles of this utility model and are not intended to limit the scope of protection of this utility model. Without departing from the principles of this utility model, those skilled in the art can adjust the above-described settings to make this utility model applicable to more specific application scenarios.

[0051] Of course, the alternative implementation methods described above, as well as the alternative implementation methods and preferred implementation methods, can be used in combination to create new implementation methods that are suitable for more specific application scenarios.

[0052] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: Battery cell assembly; The housing includes side beams and a middle beam, which enclose multiple receiving cavities, and the battery cell assembly is disposed within the receiving cavities. Cold plate, located below the casing; In the stacking direction of the housing and the cold plate, the battery pack further includes a connecting plate disposed between the housing and the cold plate, the connecting plate connecting the housing and the cold plate, a first groove is provided between the bottom of the housing and the cold plate, and the connecting plate is at least partially disposed in the first groove.

2. The battery pack according to claim 1, characterized in that, The side beam includes a first main body, a second main body, and a protrusion. The second main body is located away from the battery cell assembly, and the protrusion is located close to the battery cell assembly.

3. The battery pack according to claim 2, characterized in that, The height of the protrusion gradually decreases in the direction away from the first body.

4. The battery pack according to claim 3, characterized in that, The height of the protrusion is 1 / 5 to 1 / 2 of the height of the first main body.

5. The battery pack according to claim 4, characterized in that, The protrusion includes a bottom surface and an inclined surface located between the bottom surface and the first body, and a second groove is provided on the inclined surface.

6. The battery pack according to claim 2, characterized in that, The bottom surface of the protrusion and the cold plate surround each other to form the first groove.

7. The battery pack according to claim 2, characterized in that, The projection of the connecting plate in the horizontal direction partially overlaps with the battery cell assembly.

8. The battery pack according to claim 7, characterized in that, The connecting plate is bonded to the overlapping area of ​​the horizontal projection of the battery cell assembly, the connecting plate is bonded to the bottom surface of the protrusion, and the connecting plate is bonded to the cold plate.

9. The battery pack according to claim 1, characterized in that, The connecting plate is disposed between the battery cell assembly and the side beam. The projection of the connecting plate in the horizontal direction partially overlaps with both the battery cell assembly and the housing. There are multiple connecting plates, and the number of connecting plates corresponds to the number of receiving cavities.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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