Battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack. Comprising a box body which comprises a beam structure. The battery cell stacking body comprises a plurality of battery cells which are arranged in a stacking manner, and the battery cell stacking body is mounted in the box body; the end plate is located between the beam structure and the battery cell stacking body and abuts against the battery cell stacking body and the beam structure, and a gap is formed between a part of the end plate and the beam structure; the support is located in the gap and abuts against the end plate and the beam structure, and at least part of the gap is defined as a protection area; and the electrifying structural part is connected with the battery core stacking body, and at least part of the electrifying structural part is located in the protection area. The supports abutting against the end plates and the beam structures are arranged in the gap areas, so that installation space can be provided for the electrifying structural parts, the rigidity of the end plates can be improved, the deformation of the end plates can be reduced, the structural stability can be improved, the battery cell stacking body parts can be protected, and the stability and the safety of the battery pack can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of power battery technology, and in particular relates to a battery pack. Background Technology

[0002] With the continuous development of new energy vehicles, power batteries are gradually moving towards higher energy density and higher volume utilization. In the internal design of battery packs, the space occupied by battery cells is gradually increasing, leaving less and less space for other structural components. Reasonably arranging key structural components while meeting structural strength requirements has become a major challenge in battery pack design. Currently, for some structural technologies that directly integrate battery cells into the battery pack, in order to reduce the weight of the battery pack and save internal space, the cell end plate is generally made of plastic and directly fits into the battery pack frame. However, due to the need to avoid energized structural components within the battery pack, a certain gap is left between the cell end plate and the battery pack frame in some areas. During use, the battery cell expands. Because of the gap between the cell end plate and the frame, the cell end plate can deform significantly in some areas during expansion, posing a risk of breakage. Furthermore, as the degree of cell expansion increases, the deformation of the end plate also gradually increases, which can easily cause compression of energized structural components, leading to failure or short circuits. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a battery pack that solves the problem that the end plate in the battery pack is prone to failure when the battery cell expands, causing compression of the energized structural components. This improves the structural strength and rigidity of the end plate, reduces the risk of structural failure of the end plate, and thus improves the stability and safety of the battery pack.

[0004] To achieve the above and other related objectives, this utility model provides a battery pack, comprising:

[0005] The box-shaped structure includes a beam structure;

[0006] A battery cell stack, comprising a plurality of stacked battery cells, wherein the battery cell stack is installed inside the housing;

[0007] An end plate is located between the beam structure and the cell stack, and abuts against both the cell stack and the beam structure, with a gap between a portion of the end plate and the beam structure.

[0008] A support, located within the gap, abutting against the end plate and the beam structure respectively, and defining at least a portion of the gap as a protected area;

[0009] An electrically conductive structural component is connected to the battery cell stack, and at least a portion of the electrically conductive structural component is located within the protected area.

[0010] Optionally, the bracket can be detachably mounted on the end plate.

[0011] Optionally, the end plates each have a first side facing the cell stack and a second side facing the beam structure, the first side abutting against the cell stack, the upper part of the second side forming a gap with the beam structure to accommodate the bracket, and the lower part of the second side abutting against the beam structure.

[0012] Optionally, the upper part of the second side is provided with a reinforcing part, which abuts against the bracket, and the lower part of the second side is provided with a protruding part, which abuts against the beam structure and supports the bracket.

[0013] Optionally, the bracket includes a first abutment, a second abutment, and a connecting part. The first abutment abuts against the beam structure, the second abutment abuts against the reinforcing part, and the connecting part connects the first abutment and the second abutment and is connected and fixed to the protrusion.

[0014] Optionally, the protrusion is provided with a buckle that engages and fixes with the connecting part.

[0015] Optionally, the end of the second abutment portion away from the connecting portion is bent to form a bent structure that presses down on the reinforcing portion, and the bent structure is provided with a fixing hole for fixing the energized structural component.

[0016] Optionally, the cross-section of the bracket is U-shaped with the opening facing upwards.

[0017] Optionally, the first abutting part, the second abutting part, and the connecting part cooperate to define the protected area, and the width of the protected area is a, where a ≥ 6 mm.

[0018] Optionally, the bracket may include a metal component.

[0019] Optionally, the energized structural component includes at least one of a flexible circuit board, a copper busbar, or a wire harness.

[0020] Optionally, there may be multiple supports, which are spaced apart along the extension direction of the end plate.

[0021] Optionally, the stiffness of the bracket is greater than the stiffness of the end plate.

[0022] Optionally, the bracket is embedded and fixed on the end plate.

[0023] As described above, the battery pack of this utility model has at least the following beneficial effects: the bracket provided in the gap area abuts against the end plate and beam structure, which can not only provide installation space for the energized structural components, but also improve the rigidity of the end plate, which is conducive to reducing the deformation of the end plate, improving the structural stability, and protecting the cell stack, thereby improving the stability and safety of the battery pack. Attached Figure Description

[0024] Figure 1 This is a partial structural diagram of an embodiment of the battery pack of this utility model;

[0025] Figure 2 This is a top view of a partial structure of an embodiment of the battery pack of this utility model;

[0026] Figure 3 for Figure 2 Sectional view at point AA;

[0027] Figure 4 for Figure 3 A magnified schematic diagram of part B in the middle;

[0028] Figure 5 for Figure 2 Schematic diagram of the middle plate;

[0029] Figure 6 for Figure 2 A schematic diagram of the structure of the central support.

[0030] Part Number Explanation

[0031] Box 1, beam structure 11, battery cell stack 2, end plate 3, reinforcing part 31, protrusion 32, buckle 33, bracket 4, first abutment part 41, second abutment part 42, connecting part 43, bending structure 44, fixing hole 45, protection zone 46, power-conducting structural component 5, gap 6. Detailed Implementation

[0032] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0033] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0034] See Figures 1 to 4 In some optional embodiments, this application provides a battery pack, which includes a housing 1, a cell stack 2, an end plate 3, a bracket 4, and a power-conducting structural member 5. The housing 1 includes a beam structure 11, the cell stack 2 is installed inside the housing 1, the end plate 3 is located between the beam structure 11 and the cell stack 2, the end plate 3 abuts against both the cell stack 2 and the beam structure 11, and a gap 6 is formed between a portion of the end plate 3 and the beam structure 11; the bracket 4 is located within the gap 6, abuts against both the end plate 3 and the beam structure 11, and defines at least a portion of the gap 6 as a protection zone 46; the power-conducting structural member 5 is connected to the cell stack 2, and at least a portion of the power-conducting structural member 5 is located within the protection zone 46.

[0035] Optionally, the cell stack 2 includes multiple stacked cells, such as pouch cells, and the housing 1 has two opposing beam structures 11, such as side beams, which are arranged along the stacking direction of the multiple cells, i.e., the Y direction in the figure.

[0036] Optionally, the power-conducting structural component 5 includes at least one of a flexible printed circuit (FPC), a copper busbar, or a wire harness. The power-conducting structural component 5 is used to collect information, transmit information, or output electrical energy to multiple cells in the cell stack 2.

[0037] Optionally, the bracket 4 is detachably mounted on the end plate 3. This detachable connection between the bracket 4 and the end plate 3 allows for flexible configuration of the bracket 4 according to requirements. The number of brackets 4 can be one or more. When there are multiple brackets 4, they are spaced apart along the extension direction of the end plate 3. This spaced arrangement helps adapt to the shape of the end plate 3, especially for irregularly shaped end plates 3. The separate arrangement of multiple brackets 4 reduces the requirements on the shape and structure of the end plate 3, facilitating flexible configuration of the number and arrangement according to needs. The high flexibility of the bracket arrangement helps reduce weight and cost. In this application, the extension direction of the flexible circuit board, the extension direction of the wire harness, and the extension direction of the end plate 3 are the same, i.e., the X direction in the attached figures. Furthermore, the bracket 4 and the end plate 3 can be fixed by snap-fit ​​33 or by screw locking, making disassembly and assembly simple and convenient, and improving assembly efficiency.

[0038] Optionally, the bracket 4 is embedded and fixed on the end plate 3. The end plate 3 can be made of plastic, and the bracket 4 can be directly fixed on the end plate 3 during injection molding.

[0039] Optionally, the stiffness of the bracket 4 is greater than that of the end plate 3, and the strength of the bracket 4 is greater than that of the end plate 3. In other words, the bracket 4 has a stronger resistance to deformation than the end plate 3. Furthermore, the bracket 4 includes metal parts, and the end plate 3 includes plastic parts.

[0040] In the battery pack of the above embodiment, the bracket 4 is limited and installed in the gap 6, and simultaneously abuts against the end plate 3 and the beam structure 11. When the cell expands and causes the end plate 3 to deform, the bracket 4 can reduce the deformation of the end plate 3 and protect the energized structural component 5. This helps to reduce the risk of short circuit caused by the energized structural component 5 being squeezed, thereby improving the safety performance of the battery pack.

[0041] See Figures 2 to 6 In some alternative embodiments, the end plate 3 has a first side facing the cell stack 2 and a second side facing the beam structure 11. The first side abuts against the cell stack 2, and the upper part of the second side forms a gap 6 between itself and the beam structure 11 to accommodate the bracket 4. The lower part of the second side abuts against the beam structure 11. The bracket 4 is located on the upper part of the second side of the end plate 3, which facilitates the installation of both the bracket 4 and the power-conducting structural component 5.

[0042] Optionally, the first side of the end plate 3 abuts against the large surface side of the battery cell, which is the side with the largest surface area of ​​the battery cell.

[0043] Optionally, the upper part of the second side of the end plate 3 is provided with a reinforcing part 31, which abuts against the bracket 4, and the lower part of the second side is provided with a protruding part 32, which abuts against the beam structure 11 and supports the bracket 4. Further, the bracket 4 is installed on the top of the protruding part 32, and the side of the protruding part 32 abuts against the beam structure 11. The distance between the side of the reinforcing part 31 and the beam structure 11 is greater than the distance between the side of the protruding part 32 and the beam structure 11, so that when the protruding part 32 abuts against the beam structure 11, there is still space (gap 6) between the reinforcing part 31 and the beam structure 11 to accommodate the bracket 4 and the power-conducting structural member 5.

[0044] Optionally, the bracket 4 includes a first abutment part 41, a second abutment part 42, and a connecting part 43. The first abutment part 41 abuts against the beam structure 11, the second abutment part 42 abuts against the reinforcing part 31, and the connecting part 43 connects the first abutment part 41 and the second abutment part 42 and is fixedly connected to the protrusion 32. Furthermore, the cross-section of the bracket 4 is U-shaped with the opening facing upwards, which facilitates the installation of the power-conducting structural component 5.

[0045] Optionally, the protrusion 32 is provided with a buckle 33 that engages and fixes with the connecting part 43. Each bracket 4 has two oppositely arranged buckles 33, which are located on both sides of the connecting part 43 in the extension direction of the end plate 3 to lock and press the two sides of the connecting part 43. Further, the height of the buckle 33 is e, 5mm≤e≤8mm, and the width of the buckle 33 in the X direction is f, 4mm≤f≤6mm; specifically, e can be any value among 5.5mm, 6mm, 7mm or other values, and f can be any value among 4.5mm, 5mm, 5.5mm or other values. In this application, the height direction of the buckle 33, the height direction of the bracket 4, the height direction of the end plate 3, and the height direction of the beam structure 11 are the same, i.e., the Z direction in the figure.

[0046] Optionally, the end of the second abutment 42 away from the connecting part 43 is bent to form a bent structure 44 that presses down on the reinforcing part 31. The bent structure 44 is pressed onto the top of the reinforcing part 31. The bent structure 44 is provided with a fixing hole 45 for fixing the energized structural component 5. The distance between the fixing hole 45 and the edge of the bent structure 44 is greater than 5mm, which helps to reduce the risk of the bent structure 44 breaking. The energized structural component 5, such as a flexible circuit board, copper busbar, or wire harness, can be fixed to the fixing hole 45 by means of a fixing member such as a strip. Further, the width of the bent structure 44 is c, where c ≥ 10mm, and the diameter of the fixing hole 45 is D, where 6mm ≤ D ≤ 8mm. Specifically, c can be any value among 11mm, 13mm, 17mm, or other values, and D can be any value among 6.5mm, 7mm, 7.5mm, or other values. The energized structural component 5 is fixed on the fixing hole 45 of the bracket 4, which helps to improve the stability of the installation of the energized structural component 5. In particular, when fixing the copper busbar, it can improve the constraint stiffness of the copper busbar and reduce the risk of the copper busbar breaking under vibration and impact conditions.

[0047] Optionally, the first abutment part 41, the second abutment part 42, and the connecting part 43 cooperate to define a protective zone 46, and the width of the protective zone 46 is 'a', or in other words, the distance between the first abutment part 41 and the second abutment part 42 is 'a', where 'a' ≥ 6 mm. Using a suitable distance between the first abutment part 41 and the second abutment part 42 is beneficial for saving space, improving space utilization, and facilitating the installation of the power-conducting structural component 5. Further, 'a' can be any value among 7 mm, 9 mm, 10 mm, or other values. Additionally, the height of the bracket 4 is 'b', where 'b' ≥ 30 mm, and the thickness of the bracket 4 is 'd', where 'd' ≥ 2 mm; specifically, 'b' can be any value among 31 mm, 35 mm, 40 mm, or other values, and 'd' can be any value among 3 mm, 4 mm, 5 mm, or other values.

[0048] The battery pack of this utility model has a bracket 4 installed in the gap 6 between the end plate 3 and the beam structure 11. This helps to improve the structural strength and rigidity of the end plate 3, and helps to reduce the deformation of the end plate 3 caused by the expansion of the battery cell. This reduces the risk of failure and short circuit caused by the battery cell squeezing the energized structural component 5, thereby improving the safety and quality of the battery pack.

[0049] In the description of this specification, the references to terms such as "this embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: The box-shaped structure includes a beam structure; A battery cell stack, comprising a plurality of stacked battery cells, wherein the battery cell stack is installed inside the housing; An end plate is located between the beam structure and the cell stack, and abuts against both the cell stack and the beam structure, with a gap between a portion of the end plate and the beam structure. A support, located within the gap, abutting against the end plate and the beam structure respectively, and defining at least a portion of the gap as a protected area; An electrically conductive structural component is connected to the battery cell stack, and at least a portion of the electrically conductive structural component is located within the protected area.

2. The battery pack according to claim 1, characterized in that, The bracket is detachably mounted on the end plate.

3. The battery pack according to claim 1 or 2, characterized in that, The end plates each have a first side facing the cell stack and a second side facing the beam structure. The first side abuts against the cell stack, the upper part of the second side forms a gap with the beam structure to accommodate the bracket, and the lower part of the second side abuts against the beam structure.

4. The battery pack according to claim 3, characterized in that, The upper part of the second side is provided with a reinforcing part, which abuts against the bracket, and the lower part of the second side is provided with a protruding part, which abuts against the beam structure and supports the bracket.

5. The battery pack according to claim 4, characterized in that, The bracket includes a first abutment part, a second abutment part, and a connecting part. The first abutment part abuts against the beam structure, the second abutment part abuts against the reinforcing part, and the connecting part connects the first abutment part and the second abutment part and is connected and fixed to the protrusion part.

6. The battery pack according to claim 5, characterized in that, The protruding part is provided with a buckle that engages and fixes with the connecting part.

7. The battery pack according to claim 5, characterized in that, The end of the second abutment that is away from the connecting part is bent to form a bent structure that presses down on the reinforcing part. The bent structure is provided with fixing holes for fixing the power-conducting structural components.

8. The battery pack according to claim 5, characterized in that, The cross-section of the bracket is U-shaped with the opening facing upwards.

9. The battery pack according to claim 5, characterized in that, The first abutting part, the second abutting part, and the connecting part cooperate to define the protected area, and the width of the protected area is a, where a ≥ 6 mm.

10. The battery pack according to claim 1, characterized in that, The bracket includes metal components.

11. The battery pack according to claim 1, characterized in that, The electrically conductive structural component includes at least one of a flexible circuit board, a copper busbar, or a wire harness.

12. The battery pack according to claim 1, characterized in that, The number of brackets is multiple, and the multiple brackets are distributed at intervals along the extension direction of the end plate.

13. The battery pack according to claim 1, characterized in that, The stiffness of the bracket is greater than that of the end plate.

14. The battery pack according to claim 1, characterized in that, The bracket is embedded and fixed on the end plate.

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