Battery module end plate and battery pack

Abstract

The utility model provides a battery module end plate and a battery pack, the battery module end plate comprises a body, the body is provided with a first side surface and a second side surface which are oppositely arranged along a first direction, and a third side surface and a fourth side surface which are oppositely arranged along a second direction, and the extension line of the first direction is perpendicular to the extension line of the second direction; the fourth side surface is connected with a battery cell; the avoiding groove is formed in the first side face and the second side face, the avoiding groove is provided with a first opening facing the fourth side face, and the insulating part arranged on the steel belt in a sleeving mode is at least partially located in the avoiding groove through the first opening; wherein the multiple battery cells are located between the two bodies, and the receding grooves and the insulating parts are arranged at intervals. According to the technical scheme, the structure of the insulating part can be effectively prevented from being abraded, and then the service life of the insulating part is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly relates to a battery module end plate and a battery pack. Background Art

[0002] With the rapid development of the new energy vehicle field, the demand for power batteries is increasing day by day. A battery module usually stacks multiple single cells in sequence, and then installs end plates at both ends along the stacking direction of the cells. The end plates are pressed, and then the end plates on both sides are fixed through components such as steel strips to realize the assembly of the battery module. Generally, in order to prevent the steel strip from contacting the cell and conducting electricity, an insulating part is usually sleeved on the outer periphery of the steel strip. However, the cells in the module will expand to a certain extent during use, which will cause the tension of the steel strip to increase, thereby increasing the acting force when the insulating part contacts the edge of the end plate. During long-term use, the structure of the insulating part will be worn, thus reducing the service life of the insulating part. Summary of the Utility Model

[0003] The embodiments of this application provide a battery module end plate and a battery pack, which can effectively avoid the wear of the structure of the insulating part, and thus improve the service life of the insulating part.

[0004] In a first aspect, the embodiments of this application provide a battery module end plate for connecting with a steel strip. The battery module end plate includes: a body having a first side and a second side oppositely arranged along a first direction and a third side and a fourth side oppositely arranged along a second direction. The extension line of the first direction is perpendicular to the extension line of the second direction, and the fourth side is used for connecting with a cell; an avoidance groove provided on the first side and the second side. The avoidance groove has a first opening facing the fourth side, and the insulating part sleeved on the steel strip is at least partially located in the avoidance groove through the first opening; wherein, a plurality of cells are located between two bodies. The insulating part has a side wall connected to the outer side wall of the cell, and the avoidance groove has an inner wall corresponding to the side wall. There is a gap between the side wall and the inner wall along the first direction of the body.

[0005] Optionally, the insulating part has a side wall connected to the outer side wall of the cell, and the avoidance groove has an inner wall corresponding to the side wall. The gap between the side wall and the inner wall in the first direction is L1, and 0.5 mm ≤ L1 ≤ 1 mm.

[0006] Optionally, there is a gap between the insulating part and the avoidance groove in a third direction, and the gap is L2, 1.5 mm ≤ L2. The extension lines of the first direction, the second direction, and the third direction are perpendicular to each other.

[0007] Optionally, there is a first connection surface between the first side surface and the third side surface, and a second connection surface between the second side surface and the third side surface. The battery module end plate further includes: a limiting groove provided at the first connection surface and / or the second connection surface, and the limiting groove and the avoiding groove are correspondingly arranged in the third direction. A part of the steel strip is located in the limiting groove, and the limiting groove is used to limit the displacement of the steel strip in the third direction.

[0008] Optionally, there is a gap between the steel strip and the limiting groove in the third direction, and the minimum value of the gap is L3, and 0.5 mm ≤ L3.

[0009] Optionally, the battery module end plate further includes a strengthening structure provided on the third side surface.

[0010] Optionally, the battery module end plate further includes a connecting column located on the third side surface, and a first lifting hole is provided on the connecting column, and the first lifting hole is used for mating connection with an external part.

[0011] Optionally, the battery module end plate further includes a second lifting hole, at least part of the second lifting hole is located on the third side surface, and the second lifting hole and the strengthening structure are arranged at intervals.

[0012] Optionally, the battery module end plate further includes a groove provided on the fourth side surface and arranged along the circumference of the fourth side surface.

[0013] In a second aspect, an embodiment of the present application provides a battery pack, which includes: a battery module; the above-mentioned battery module end plate, a glue layer is provided between the battery module and the battery module end plate, and the groove of the battery module end plate is used to accommodate the glue layer overflowing when the battery cell is connected to the fourth side surface; a steel strip for fixedly connecting the battery module end plate and the battery module; an insulating part sleeved on the steel strip and arranged to avoid the limiting groove of the battery module end plate.

[0014] Applying the technical solution of the present application, when the battery cell expands after long-term use, the tension on the steel strip becomes larger. Since the avoiding groove is provided on the first side surface and / or the second side surface, at least part of the insulating part is located in the avoiding groove and the avoiding groove and the insulating part are arranged at intervals. With this arrangement, there will be no friction between the insulating part and the avoiding groove, thereby avoiding wear of the structure of the insulating part and being beneficial to extending the service life of the insulating part. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1It is a three-dimensional schematic diagram of the battery module end plate provided by the embodiment of the present application;

[0017] Figure 2 It is a three-dimensional schematic diagram of another perspective of the battery module end plate provided by the embodiment of the present application;

[0018] Figure 3 It is a front view schematic diagram of the battery module end plate provided by the embodiment of the present application;

[0019] Figure 4 It is a rear view schematic diagram of the battery module end plate provided by the embodiment of the present application;

[0020] Figure 5 It is a side view schematic diagram of the battery module end plate provided by the embodiment of the present application;

[0021] Figure 6 It is a structural schematic diagram of the battery module end plate and the insulating member provided by the embodiment of the present application;

[0022] Figure 7 It is Figure 6 The enlarged schematic diagram at A in;

[0023] Figure 8 It is an assembly schematic diagram of the battery module end plate, the steel strip and the insulating member provided by the embodiment of the present application;

[0024] Figure 9 It is Figure 8 The enlarged schematic diagram at B in;

[0025] Figure 10 It is Figure 8 The enlarged schematic diagram at C in.

[0026] Among them, the above-mentioned drawings include the following reference numerals:

[0027] 10, body; 11, first side; 12, second side; 13, third side; 14, fourth side;

[0028] 20, avoidance groove; 21, inner wall;

[0029] 31, first connection surface; 32, second connection surface;

[0030] 40, limiting groove;

[0031] 50, strengthening structure;

[0032] 60, connecting column; 61, first lifting hole;

[0033] 70, second lifting hole;

[0034] 80, groove;

[0035] 90. Steel strip; 100. Insulating member; X. First direction; Y. Second direction; Z. Third direction. Detailed implementation manner

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0037] As Figures 1 to 10 As shown in the figure, on the first aspect, an embodiment of the present application provides a battery module end plate for connecting with a steel strip 90. The battery module end plate includes: a body 10 having a first side surface 11 and a second side surface 12 oppositely arranged in the first direction and a third side surface 13 and a fourth side surface 14 oppositely arranged in the second direction. The extension line of the first direction is perpendicular to the extension line of the second direction. The fourth side surface 14 is used for connecting with an electric core; an avoidance groove 20 is arranged on the first side surface 11 and the second side surface 12. The avoidance groove 20 has a first opening facing the fourth side surface 14. An insulating member 100 sleeved on the steel strip 90 is at least partially located in the avoidance groove 20 through the first opening; wherein, a plurality of electric cores are located between two bodies 10. The insulating member 100 has a side wall connected to the outer side wall of the electric core. The avoidance groove 20 has an inner wall 21 corresponding to the side wall. There is a gap between the side wall and the inner wall 21 along the first direction of the body 10.

[0038] Applying the technical solution of the present application, when the electric core expands after long-term use, the tension on the steel strip 90 becomes larger. Since the avoidance groove 20 is arranged on the first side surface 11 and / or the second side surface 12, the insulating member 100 is at least partially located in the avoidance groove 20 and the avoidance groove 20 is spaced from the insulating member 100. With such a setting, no friction will occur between the insulating member 100 and the avoidance groove 20, thereby avoiding wear of the structure of the insulating member 100 and being beneficial to extending the service life of the insulating member 100.

[0039] In the present application, the insulating member 100 is specifically a heat-shrinkable sleeve. Since the heat-shrinkable sleeve has good electrical insulation performance, it can effectively prevent current leakage. At the same time, the heat-shrinkable sleeve also has certain flame retardant properties. When the electric core has a thermal runaway and catches fire, it can, to a certain extent, prevent the spread of the fire, thereby improving the safety during the operation of the device. And the structure of the heat-shrinkable sleeve is relatively simple, so it is convenient to process, reducing the processing difficulty of the structure and being beneficial to reducing the overall production cost of the device.

[0040] Optionally, an avoidance groove 20 can be set on the first side 11, or on the second side 12, or on both the first side 11 and the second side 12. The specific setting should be selected according to the use environment of the device, as long as it can meet the use requirements of the device. This can improve the applicability and scope of application of the device during use, thereby meeting customer requirements.

[0041] In an embodiment of the present application, avoidance grooves 20 are provided on both the first side surface 11 and the second side surface 12, and the avoidance grooves 20 on the first side surface 11 and the avoidance grooves 20 on the second side surface 12 are at the same position in the third direction. This arrangement can not only ensure the stability of the steel belt 90 when it is connected and fixed to the end plate, but also prevent the insulating member 100 sleeved on the outer periphery of the steel belt 90 from contacting the end plate, thereby protecting the insulating members 100 on both sides and further improving the service life of the insulating members 100.

[0042] Further, the insulating member 100 has a side wall connected to the battery cell, and the avoidance groove 20 has an inner wall 21 corresponding to the side wall, and the interval between the side wall and the inner wall 21 in the first direction is L1, 0.5mm≤L1≤1mm. When L1>1mm, the interval between the side wall and the avoidance groove 20 is too large, which causes a waste of space, thus reducing the space utilization efficiency of the component and increasing the production cost of the device, which is not conducive to the mass production of the device. When L1<0.5mm, the interval between the side wall and the avoidance groove 20 is too small, so that during the operation of the device, the side wall of the insulating member 100 may come into contact with the inner wall 21 of the avoidance groove 20, thereby damaging the structure of the side wall of the insulating member 100, which reduces the stability of the device when in use. Therefore, 0.5mm≤L1≤1mm can not only ensure the space utilization of the component and reduce the production cost of the device, but also avoid the contact between the side wall of the insulating member 100 and the inner wall 21 of the avoidance groove 20 as much as possible, thereby ensuring the stability of the component when in use. Optionally, L1 can be set to a value such as 0.5 mm, 0.8 mm or 1 mm. The specific setting should be selected according to the use environment of the device and is not specifically limited here.

[0043] At the same time, the inner wall 21 of the avoidance groove 20 is parallel to the side wall of the insulating member 100, which makes it easy to process the inner wall 21 of the avoidance groove 20, reduces the difficulty of processing the avoidance groove 20, and also correspondingly reduces the production cost of the device. Of course, in other embodiments of the present application, the inner wall 21 of the avoidance groove 20 can also be set to have an angle with the side wall of the insulating member 100. The specific setting should be selected according to the use environment of the device, which can improve the applicability and scope of application of the device.

[0044] Specifically, the insulating member 100 and the avoidance groove 20 have a gap in the third direction, and the gap is L2, where 1.5 mm ≤ L2. The extension lines of the first direction, the second direction, and the third direction are perpendicular to each other. When L2 < 1.5 mm, the gap between the insulating member 100 and the avoidance groove 20 is too small. Such a setting not only makes it inconvenient for the insulating member 100 to be arranged in the avoidance groove 20 through the first opening, but also reduces the installation efficiency between the two due to the small margin between the insulating member 100 and the avoidance groove 20 during installation. Therefore, setting 1.5 mm ≤ L2 can not only ensure that there is enough gap between the insulating member 100 and the avoidance groove 20 for the insulating member 100 to be arranged in the avoidance groove 20 through the first opening. Optionally, L2 can be set to values such as 1.5 mm, 2 mm, or 2.2 mm, etc. The specific setting should be selected according to the usage environment of the device and is not specifically limited here.

[0045] In this application, X is the first direction, Y is the second direction, and Z is the third direction.

[0046] Further, there is a first connection surface 31 between the first side surface 11 and the third side surface 13, and a second connection surface 32 between the second side surface 12 and the third side surface 13. The battery module end plate further includes: a limiting groove 40, which is arranged at the first connection surface 31 and / or the second connection surface 32, and the limiting groove 40 is correspondingly arranged with the avoidance groove 20 in the third direction. A part of the steel strip 90 is located in the limiting groove 40, and the limiting groove 40 is used to limit the displacement of the steel strip 90 in the third direction. Such a setting can prevent the position of the steel strip 90 from changing in the third direction to better resist the swelling force from the battery cells.

[0047] In this application, the first connection surface 31 and the second connection surface 32 are arc-shaped transition surfaces, and the contact position between the limiting groove 40 and the steel strip 90 is also an arc-shaped transition surface. Such a setting makes the limiting groove 40 and the steel strip 90 in surface contact, which increases the contact area between the limiting groove 40 and the steel strip 90, makes the force distribution on the steel strip 90 more uniform, helps reduce the friction and wear of the contact surface. Therefore, using surface contact can extend the service life of the steel strip 90, and also helps to provide a stable and reliable connection. Compared with the line contact method, surface contact can withstand various external forces and vibrations, and it is not easy to make the steel strip 90 loose or fail. When the battery cells expand, it can protect the structure of the steel strip 90.

[0048] Specifically, there is a gap between the steel strip 90 and the limiting groove 40 in the third direction. The minimum value of the gap is L3, and 0.5 mm ≤ L3. When L3 < 0.5 mm, the gap between the insulating part 100 and the avoidance groove 20 is too small. With such a setting, it is not convenient to place the steel strip 90 in the limiting groove 40. During installation, due to the small margin between the steel strip 90 and the limiting groove 40, the installation efficiency between the two will be reduced. Therefore, 0.5 mm ≤ L3 can not only ensure that there is enough gap between the steel strip 90 and the limiting groove 40 to improve the installation efficiency between the two. Optionally, L3 can be set to values such as 0.5 mm, 1 mm, or 2 mm. The specific setting should be selected according to the use environment of the device and will not be specifically limited here.

[0049] Furthermore, the battery module end plate further includes a strengthening structure 50, and the strengthening structure 50 is arranged on the third side surface 13. In this application, the strengthening structure 50 is specifically a reinforcing rib plate, and the extending direction of the reinforcing rib plate is perpendicular to the third side surface 13, which can improve the structural strength of the third side surface 13 to ensure the stability of the end plate during use.

[0050] Specifically, the battery module end plate further includes a connecting column 60. The connecting column 60 is located on the third side surface 13, and a first lifting hole 61 is arranged on the connecting column 60. The first lifting hole 61 is used for mating connection with an external part. In this application, the axis of the connecting column 60 is perpendicular to the third side surface 13, which is convenient for the processing of the structure and can thus reduce the production cost of the device. Optionally, the axis of the connecting column 60 can also be set to an acute angle or an obtuse angle with respect to the third side surface 13. The specific setting should be selected according to the use environment of the device, which can improve the applicability and application range of the device.

[0051] In this application, the axis of the first lifting hole 61 coincides with the axis of the connecting column 60 and the number is set to two, and they are symmetrically arranged along the axis of the battery module end plate. This is convenient for the processing of the structure. At the same time, the first lifting hole 61 is used for connection and fixation with a robotic arm to facilitate the robotic arm to lift the battery module end plate. And the inner diameter of the first lifting hole 61 in this application is Φ, and 12 mm ≤ Φ. Optionally, the inner diameter of the first lifting hole 61 can be set to values such as 12 mm, 13 mm, or 14 mm, as long as it can meet the use requirements of the device, and will not be specifically limited here.

[0052] Furthermore, the battery module end plate further includes a second lifting hole 70. The second lifting hole 70 is at least partially located on the third side surface 13, and the second lifting hole 70 is spaced apart from the reinforcing structure 50. In this application, the second lifting hole 70 is used for manual lifting by the user. With this arrangement, the battery module end plate can be lifted by different devices through the first lifting hole 61 and the second lifting hole 70 respectively, thereby improving the flexibility during the lifting of the battery module end plate and effectively increasing the lifting efficiency.

[0053] In this application, a through hole is provided on the top wall of the battery module end plate, and the through hole communicates with the second lifting hole 70. With this arrangement, the entire module can be fixed on the installation platform by inserting a bolt into the through hole.

[0054] Specifically, the battery module end plate further includes a groove 80. The groove 80 is provided on the fourth side surface 14, and the groove 80 is used to accommodate the colloid that overflows when the battery cell is connected to the fourth side surface 14. In this application, the groove 80 is specifically an overflow groove and is arranged along the circumference of the fourth side surface 14. By providing the above structure, the overflow groove enables the adhesive used when the battery cell is bonded to the end plate to flow into the overflow groove without overflowing, effectively controlling the spreading range of the adhesive and preventing the adhesive from overflowing beyond the set range.

[0055] In a second aspect, an embodiment of the present application provides a battery pack. The battery pack includes: a battery module; the above-mentioned battery module end plate. A glue layer is provided between the battery module and the battery module end plate, and the groove 80 of the battery module end plate is used to accommodate the glue layer that overflows when the battery cell is connected to the fourth side surface 14; a steel belt 90 for fixedly connecting the battery module end plate and the battery module; an insulating member 100 sleeved on the steel belt 90 and arranged to avoid the limiting groove 40 of the battery module end plate.

[0056] Applying the technical solution of the present application, when the battery cell expands after long-term use, the tension on the steel belt 90 becomes larger. Since the relief groove 20 is provided on the first side surface 11 and / or the second side surface 12, at least a part of the insulating member 100 is located in the relief groove 20 and the relief groove 20 is spaced apart from the insulating member 100. With this arrangement, no friction will occur between the insulating member 100 and the relief groove 20, thereby avoiding wear on the structure of the insulating member 100 and being beneficial to extending the service life of the insulating member 100.

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0059] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary statements, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0060] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0061] In addition, it should be noted that the use of words such as "first", "second" to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meaning, and thus should not be construed as limiting the protection scope of the present application.

[0062] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery module end plate for connecting with a steel strip, characterized in that, The battery module end plate includes: A body having a first side and a second side oppositely arranged along a first direction and a third side and a fourth side oppositely arranged along a second direction, an extension line of the first direction being perpendicular to an extension line of the second direction, and the fourth side being used for connecting with an electric core; Avoidance grooves are arranged on the first side and the second side, the avoidance grooves have first openings facing the fourth side, and an insulating member sleeved on the steel strip is at least partially located in the avoidance grooves through the first openings; Wherein, a plurality of the electric cores are located between two of the bodies, the insulating member has a side wall connected to an outer side wall of the electric core, the avoidance grooves have inner walls correspondingly arranged with the side wall, and there is a gap between the side wall and the inner wall along the first direction of the body.

2. The battery module end plate according to claim 1, characterized in that, The gap between the side wall and the inner wall in the first direction is L1, and 0.5 mm ≤ L1 ≤ 1 mm.

3. The end plate of the battery module according to claim 1, characterized in that The insulating member and the avoidance grooves have a gap in a third direction, the gap is L2, and 1.5 mm ≤ L2, and the extension lines of the first direction, the second direction, and the third direction are perpendicular to each other.

4. The battery module end plate according to claim 3, characterized in that, There is a first connection surface between the first side and the third side, and a second connection surface between the second side and the third side. The battery module end plate further includes: Limit grooves are arranged at the first connection surface and / or the second connection surface, and the limit grooves and the avoidance grooves are correspondingly arranged in the third direction. Part of the steel strip is located in the limit grooves, and the limit grooves are used for restricting the displacement of the steel strip in the third direction.

5. The battery module end plate according to claim 4, characterized in that, The steel strip and the limit grooves have a gap in the third direction, the gap is L3, and 0.5 mm ≤ L3.

6. The battery module end plate according to claim 1, wherein The battery module end plate further includes a strengthening structure, and the strengthening structure is arranged on the third side.

7. The end plate of the battery module according to claim 1, characterized in that, The battery module end plate further includes a connecting column, the connecting column is located on the third side, and a first lifting hole is arranged on the connecting column, and the first lifting hole is used for being cooperatively connected with an external member.

8. The battery module end plate according to claim 6, characterized in that, The battery module end plate further includes a second lifting hole, at least part of the second lifting hole is located on the third side, and the second lifting hole and the strengthening structure are arranged at intervals.

9. The battery module end plate according to claim 1, wherein, The battery module end plate further includes a groove, and the groove is arranged on the fourth side and is arranged along the circumference of the fourth side.

10. A battery pack, characterized in that, The battery pack includes: A battery module; The battery module end plate according to any one of claims 1-9, a glue layer is arranged between the battery module and the battery module end plate, and the groove of the battery module end plate is used for accommodating the glue layer overflowing when the electric core is connected to the fourth side; A steel strip for fixedly connecting the battery module end plate and the battery module; An insulating member sleeved on the steel strip and arranged avoiding the limit grooves of the battery module end plate.

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