Battery cell integrated structure for battery pack and battery pack

Abstract

The application provides a battery pack and a battery cell integrated structure for the battery pack. The battery cell integrated structure for the battery pack comprises a box assembly, a liquid cooling plate installed in the box assembly, a plurality of through holes formed in the liquid cooling plate, a plurality of battery cells installed upside down on the upper part of the liquid cooling plate, pole columns of the battery cells capable of being inserted into the through holes, a plurality of support parts arranged between the bottom guard plate of the box assembly and the battery cells, the support parts connected with the pole columns of the battery cells, the plurality of support parts electrically connected with each other, and a fixing part installed in the box assembly and used for fixing the plurality of battery cells. The battery pack and the battery cell integrated structure for the battery pack can solve the problems of low dismountability and maintainability and high recycling difficulty of the existing battery pack structure.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery cell integrated structure and a battery pack for a battery pack. Background Art

[0002] The growing demand for new energy vehicles is driving the upgrade of automotive electronics and intelligence. Power batteries are the core structure of new energy vehicles, and adhesives are a crucial component in ensuring their long-lasting power. Current power battery designs are shifting towards CTP, CTC, and CTB. CTP technology reduces or eliminates the battery module, directly integrating the cell and battery case into the vehicle chassis, while CTC and CTB directly integrate the battery with the chassis or body.

[0003] Under this technological trend, the problem that follows is that a large amount of adhesive is needed between the battery pack shell, modules, and battery cells. Removing the adhesive will be the top challenge. The disassembly and repairability are low, and the battery pack can only be pried open with a crowbar during recycling. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a battery cell integrated structure and a battery pack for a battery pack, so as to solve the problems of low disassembly and maintainability and high recycling difficulty of the existing battery pack structure.

[0005] According to a first aspect of the present invention, a cell integration structure for a battery pack is provided, wherein the cell integration structure for the battery pack includes: a box assembly; a liquid cooling plate installed in the box assembly, and a plurality of through holes are provided on the liquid cooling plate; a plurality of battery cells are invertedly installed on the upper part of the liquid cooling plate, and the poles of the battery cells can be inserted into the through holes; a plurality of supporting parts are arranged between the bottom guard plate of the box assembly and the battery cells, the supporting parts are connected to the poles of the battery cells, and the plurality of supporting parts are conductively connected to each other; and a fixing part installed in the box assembly, and used for fixing the plurality of battery cells.

[0006] Preferably, the fixing portion includes: a beam baffle, which is arranged on the upper part of the liquid cooling plate and is arranged on both sides of the battery cell; and a positioning bracket, which is installed on the beam baffle and is clamped with the battery cell.

[0007] Preferably, the plurality of battery cells are arranged in an array on the upper portion of the liquid cooling plate, a beam baffle is provided between two adjacent rows of battery cells, and the plurality of positioning brackets are arranged at intervals along the length direction of the beam baffle.

[0008] Preferably, the positioning bracket includes three mutually perpendicular support rods, the ends of the three support rods are connected at one place, and the multiple positioning brackets are respectively clamped with the four top corners of the multiple battery cells. A first threaded hole is provided on the support rod of the positioning bracket, and a second threaded hole is provided on the beam baffle. The positioning bracket is connected to the beam baffle through a threaded connector.

[0009] Preferably, the through holes are rectangular holes, and the two poles of the battery cell can be inserted into two adjacent through holes at the same time. Insulating members are installed at the through holes.

[0010] Preferably, the supporting portion includes: a pole top plate, which abuts against the pole of the battery cell, the pole top plate is inserted into the through hole, and the pole top plate can move axially along the through hole; and a pole spring, which is arranged between the pole top plate and the bottom guard plate, and the pole spring is conductively connected to the battery cell through the pole top plate.

[0011] Preferably, a cavity is provided between the liquid cooling plate and the bottom guard plate, and a plurality of the pole springs are conductively connected within the cavity.

[0012] Preferably, when the battery cell is not installed, the upper surface of the pole top plate is flush with the upper surface of the liquid cooling plate.

[0013] Preferably, the load of the pole spring is greater than the sum of the weight of the battery cell, the pole top plate and the pole spring.

[0014] According to a second aspect of the present invention, a battery pack is provided, wherein the battery pack includes the battery cell integrated structure for the battery pack as described above.

[0015] The battery cell integrated structure for the battery pack of the embodiment of the present invention has a liquid cooling plate installed in the box assembly, and a plurality of through holes are opened on the liquid cooling plate. A plurality of battery cells are installed upside down on the upper part of the liquid cooling plate, and the poles of the battery cells are inserted into the through holes. A plurality of support parts are arranged between the bottom guard plate of the box assembly and the battery cells. The support parts are connected to the poles of the battery cells, and the plurality of support parts are conductively connected to each other. The fixing part is installed in the box assembly and is used to fix a plurality of battery cells. Such an arrangement can directly install and fix a plurality of battery cells in the battery pack without the use of adhesives, thereby realizing the detachable and replaceable battery cells, avoiding the user from replacing the entire battery pack due to damage to a single battery cell, reducing the user's usage cost and the recycling cost of the battery pack, and thus can effectively solve the problem of low detachability and maintainability of the existing battery pack structure and high recycling difficulty.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 Schematic diagram of the integrated structure of battery cells for a battery pack according to the present invention.

[0019] Figure 2 It is a schematic diagram from another angle of the battery cell integrated structure for the battery pack according to the present invention.

[0020] Figure 3 Schematic diagram of a crossbeam baffle of a cell integrated structure for a battery pack according to the present invention.

[0021] Figure 4 Schematic diagram of a positioning bracket of a cell integrated structure for a battery pack according to the present invention.

[0022] Figure 5 Schematic diagram of a battery cell with an integrated battery cell structure for a battery pack according to the present invention.

[0023] Figure markings: 1-box assembly; 10-bottom guard plate; 11-top cover; 12-cavity portion; 2-liquid cooling plate; 20-through hole; 3-fixing portion; 31-crossbeam baffle; 310-first threaded hole; 32-positioning bracket; 320-second threaded hole; 4-support portion; 41-pole top plate; 42-pole spring; 5-battery cell; 50-pole. DETAILED DESCRIPTION

[0024] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0025] The features described can be implemented in different ways, and are not to be interpreted as being limited to the examples described herein. Rather, the examples are provided as a description of embodiments that, as of this time and based at least in part on the disclosure herein, represent the best understanding of various working options for implementing the methods, apparatus, and / or systems described herein.

[0026] Throughout this specification, when an element (such as a layer, region or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, "on top of" another element or "covering" another element, it can be directly on, connected, coupled, adjacent, on top of, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly adjacent to", "directly on top of", or "directly covering" another element, there are no other elements interposed therebetween.

[0027] As used herein, the term "and / or" includes any one of the listed items and any combination of any two or more of the listed items.

[0028] Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, the first element, component, region, layer or section referred to in the examples described herein can also be referred to as the second element, component, region, layer or section without departing from the teachings of the examples.

[0029] For ease of description, spatial relationship terms, such as "on", "upper", "beneath", and "lower", can be used herein with respect to the orientation of one element relative to another element as shown in the figures. Such spatial relationship terms can be intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, a element described as being "on" or "upper" relative to other elements would then be oriented "beneath" or "lower" relative to the other elements. Accordingly, the term "on" encompasses both an "on" and "under" orientation. The device can also be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and an appropriate modification to the spatial relationship terms would be made to those of skill in the art.

[0030] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of examples. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "has," "having," and the like are inclusive of the stated features, numbers, operations, members, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, members, elements, and / or combinations thereof.

[0031] Variations in the shapes illustrated in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the specific shapes illustrated in the drawings, but include variations in shapes that occur during manufacturing.

[0032] Features of the examples described herein can be combined with one another in any manner, as would be apparent to one of skill in the art after understanding the disclosure provided herein. Furthermore, although examples described herein have various configurations, other configurations are possible as would be apparent to one of skill in the art after understanding the disclosure provided herein.

[0033] As Figures 1 to 5 illustrated, a battery pack cell integration structure according to a first aspect of the present application is provided, which includes a box assembly 1, a liquid cooling plate 2, cells 5, support portions 4, and fixing portions 3.

[0034] In the following description, reference is made to the Figures 1 to 5 The specific structure of the above components of the battery pack cell integration structure and the connection relationship of the above components are specifically described.

[0035] As Figures 1 to 5 illustrated, in an embodiment, the liquid cooling plate 2 can be installed in the box assembly 1. A plurality of through holes 20 can be formed on the liquid cooling plate 2. The plurality of cells 5 can be installed upside down (i.e., the pressure relief valve of the cell 5 is located at the top, and the pole 50 of the cell 5 is located at the bottom) on the upper portion of the liquid cooling plate 2. The pole 50 of the cell 5 can be inserted into the through hole 20. The plurality of support portions 4 can be arranged between the bottom guard plate 10 of the box assembly 1 and the cell 5. The support portion 4 can be connected with the pole 50 of the cell 5, and the plurality of support portions 4 can be electrically connected. The fixing portion 3 can be installed in the box assembly 1 for fixing the plurality of cells 5. In this way, the plurality of cells 5 can be directly installed and fixed in the battery pack without using adhesives, so as to realize the detachable replacement of the cell 5, avoid the user from replacing the entire battery pack due to the damage of a single cell 5, and reduce the use cost of the user and the recycling cost of the battery pack.

[0036] Preferably, as Figure 1 and Figure 2As shown, in this embodiment, the housing assembly 1 can be a rectangular parallelepiped housing. The housing assembly 1 can include a bottom guard plate 10 at its bottom and a top cover 11 at its top. Multiple battery cells 5 and a liquid cooling plate 2 can be installed within the housing assembly 1. The liquid cooling plate 2 can be positioned parallel to the bottom guard plate 10 of the housing assembly 1, and the outer periphery of the liquid cooling plate 2 can be welded to the inner wall of the housing assembly 1 using a friction stir welding process.

[0037] Preferably, Figure 1 and Figure 2 As shown, in an embodiment, the liquid cooling plate 2 can be a rectangular plate with a plurality of through-holes 20 formed therein for engaging with the poles 50 of the battery cells 5. The through-holes 20 can be arranged in an array on the liquid cooling plate 2, so that the battery cells 5 are also arranged in an array when installed on the liquid cooling plate 2, thereby saving space. The battery cells 5 can exchange heat with the liquid cooling plate 2 via the poles 50 to avoid shortening the life of the battery cells 5.

[0038] Preferably, Figure 1 、 Figure 2 and Figure 5 As shown, in an embodiment, the shape of the pole 50 of the battery cell 5 can be approximately a rectangular parallelepiped, and the through hole 20 on the liquid cooling plate 2 can be a rectangular hole. The two poles 50 of the battery cell 5 can be inserted into two adjacent through holes 20 at the same time to complete the installation. The length direction of the installed battery cell 5 can be perpendicular to the length direction of the box assembly 1, and multiple battery cells 5 can be arranged in rows along the width direction of the box assembly 1, and multiple rows of battery cells 5 can be arranged at intervals along the length direction of the box assembly 1. Furthermore, preferably, the error when the through hole 20 of the liquid cooling plate 2 and the pole 50 of the battery cell 5 are matched is not greater than 1 mm. An insulating part, such as an insulating strip, can be installed at the through hole 20 to insulate the battery cell 5 from the liquid cooling plate 2. In addition, a buffer part, such as a buffer pad, can also be installed at the through hole 20 to avoid hard collisions and damage to the battery cell 5.

[0039] Preferably, Figures 1 to 4 As shown, in an embodiment, the fixing portion 3 may include a crossbeam baffle 31 and a positioning bracket 32. The crossbeam baffle 31 may be provided on the upper portion of the liquid cooling plate 2. Both ends of the crossbeam baffle 31 may be welded and fixed to the inner wall of the box assembly 1. The crossbeam baffle 31 may be provided on opposite sides of the battery cell 5, so that a crossbeam baffle 31 is provided between each two adjacent rows of battery cells 5. Preferably, the crossbeam baffle 31 may be directly opposite to the large surface of the battery cell 5 (i.e., Figure 1The front side of the crossbeam baffle 31 is arranged perpendicular to the surface of the liquid cooling plate 2. A positioning bracket 32 ​​can be mounted on the crossbeam baffle 31. The positioning bracket 32 ​​can engage with the battery cell 5 to position the battery cell 5. Preferably, multiple positioning brackets 32 can be arranged at intervals along the length of the crossbeam baffle 31 to secure multiple battery cells 5 separately.

[0040] Further, preferably, Figures 1 to 4 As shown, in an embodiment, the positioning bracket 32 ​​may include three mutually perpendicular support rods, and the ends of the three support rods may be connected at one point. The support rods may be in the shape of a rectangular parallelepiped, so that the angle between two adjacent support rods is a right angle, so as to fix the corners of the battery cell 5. A plurality of first threaded holes 310 may be provided on the two support rods on one side of the positioning bracket 32, and the first threaded holes 310 may be arranged at intervals along the length direction of the support rods. Correspondingly, a second threaded hole 320 may be provided on the crossbeam baffle 31, so that the positioning bracket 32 ​​and the crossbeam baffle 31 may be connected by a threaded connector (which may be a bolt). The plurality of positioning brackets 32 may be respectively engaged with the four vertex corners of the plurality of battery cells 5, so that the vertex corners of the battery cells 5 are clamped at the angle between the two support rods, thereby achieving the positioning of the battery cells 5. Preferably, positioning brackets 32 may be installed on both sides of the same crossbeam baffle 31, so that only one crossbeam baffle 31 may be provided between two rows of battery cells 5 to save space.

[0041] Preferably, Figures 1 to 4 As shown, in an embodiment, the support portion 4 may include a pole top plate 41 and a pole spring 42. The pole top plate 41 may abut against the pole 50 of the battery cell 5. The pole top plate 41 may be a rectangular aluminum plate, and the pole top plate 41 may be inserted into the through hole 20 of the liquid cooling plate 2. The size of the pole top plate 41 is smaller than the size of the through hole 20, so that the pole top plate 41 can move in the through hole 20 along the axial direction of the through hole 20. The pole spring 42 may be arranged between the pole top plate 41 and the bottom guard plate 10, and the pole spring 42 may be arranged in the vertical direction. The top end of the pole spring 42 may be welded to the bottom surface of the pole top plate 41, and the pole spring 42 may be conductively connected to the battery cell 5 through the pole top plate 41. With this arrangement, when the battery cell 5 is placed on the support portion 4 , the pole top plate 41 moves downward under the gravity of the battery cell 5 , and the pole spring 42 is compressed, thereby ensuring good contact between the pole 50 of the battery cell 5 and the pole top plate 41 .

[0042] Further, preferably, Figures 1 to 4As shown, in this embodiment, a cavity 12 can be provided between the liquid cooling plate 2 and the bottom guard plate 10, that is, a gap is formed between the liquid cooling plate 2 and the bottom guard plate 10 to serve as a buffer. In addition, the multiple terminal springs 42 in the cavity 12 can be electrically connected by wires, thereby achieving an electrically conductive connection between the battery cells 5.

[0043] Preferably, Figures 1 to 4 As shown, in this embodiment, the stiffness of the pole spring 42 can be calculated using the formula F' = dF / dλ, where F' is the stiffness of the pole spring 42, dF is the load increment, and dλ is the deformation increment. The load capacity characteristic of the pole spring 42 is at least greater than the sum of the weight of the battery cell 5, the pole top plate 41, and the pole spring 42 to prevent the pole spring 42 from being unable to support the battery cell 5. Preferably, when the battery cell 5 is not installed, the upper surface of the pole top plate 41 can be flush with the upper surface of the liquid cooling plate 2.

[0044] Furthermore, according to a second aspect of the present invention, a battery pack is provided, comprising the battery cell integrated structure for the battery pack as described above.

[0045] During use, the battery cell 5 is installed upside down on the liquid cooling plate 2, and the pole 50 of the battery cell 5 is partially inserted into the through hole 20 of the liquid cooling plate 2 and abuts against the pole top plate 41, and the pole spring 42 supports the pole top plate 41 and the battery cell 5. At the upper part of the liquid cooling plate 2, the positioning bracket 32 ​​on the crossbeam baffle 31 is engaged with the four top corners of the battery cell 5, thereby achieving the positioning of the battery cell 5. This arrangement allows multiple battery cells 5 to be directly installed and fixed in the battery pack without the use of adhesives. This makes it possible to detachably replace the battery cell 5, avoiding the need for users to replace the entire battery pack due to damage to a single battery cell 5, thereby reducing the user's usage cost and the recycling cost of the battery pack.

[0046] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A cell integrated structure for a battery pack, characterized in that: The battery cell integrated structure for the battery pack includes: Box assembly; A liquid cooling plate is installed in the box assembly, and a plurality of through holes are opened on the liquid cooling plate; A plurality of battery cells are invertedly mounted on the upper portion of the liquid cooling plate, and the poles of the battery cells can be inserted into the through holes; A plurality of support portions are provided between the bottom guard plate of the box assembly and the battery cell, the support portions are connected to the poles of the battery cell, and the plurality of support portions are conductively connected to each other; and The fixing part is installed in the box assembly and is used to fix the multiple battery cells.

2. The battery cell integrated structure for a battery pack according to claim 1, characterized in that: The fixing portion includes: A beam baffle is provided on the upper portion of the liquid cooling plate, and the beam baffle is provided on both sides of the battery cell; and A positioning bracket is installed on the beam baffle, and the positioning bracket is clamped with the battery core.

3. The battery cell integrated structure for a battery pack according to claim 2, characterized in that: The plurality of battery cells are arranged in an array on the upper portion of the liquid cooling plate, a beam baffle is provided between two adjacent rows of battery cells, and the plurality of positioning brackets are arranged at intervals along the length direction of the beam baffle.

4. The battery cell integrated structure for a battery pack according to claim 3, characterized in that: The positioning bracket includes three mutually perpendicular support rods, the ends of the three support rods are connected at one place, and the multiple positioning brackets are respectively clamped with the four top corners of the multiple battery cells. A first threaded hole is provided on the support rod of the positioning bracket, and a second threaded hole is provided on the beam baffle. The positioning bracket is connected to the beam baffle through a threaded connector.

5. The battery cell integrated structure for a battery pack according to claim 1, characterized in that: The through holes are rectangular holes, and the two poles of the battery core can be inserted into two adjacent through holes at the same time. Insulating members are installed at the through holes.

6. The battery cell integrated structure for a battery pack according to claim 1, characterized in that: The support portion includes: A pole top plate abuts against the pole of the battery cell, the pole top plate is inserted into the through hole, and the pole top plate can move along the axial direction of the through hole; and The pole spring is arranged between the pole top plate and the bottom guard plate, and the pole spring is conductively connected to the battery cell through the pole top plate.

7. The battery cell integrated structure for a battery pack according to claim 6, characterized in that: A cavity is provided between the liquid cooling plate and the bottom guard plate, and a plurality of the pole springs are conductively connected within the cavity.

8. The battery cell integrated structure for a battery pack according to claim 6, characterized in that: When the battery cell is not installed, the upper surface of the pole top plate is flush with the upper surface of the liquid cooling plate.

9. The battery cell integrated structure for a battery pack according to claim 6, characterized in that: The load of the pole spring is greater than the sum of the weight of the battery core, the pole top plate and the pole spring.

10. A battery pack, characterized in that: The battery pack includes the battery cell integrated structure for the battery pack according to any one of claims 1 to 9.

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