Battery pack, automobile and cell mounting method

Abstract

The application relates to a battery pack, an automobile and a battery cell mounting method. The battery pack comprises a box body, cross beams and a battery cell group; the two ends of the cross beams are fixedly connected with a first side wall and a second side wall of the box body, and installation positions are formed between the adjacent cross beams; the battery cell group comprises a plurality of battery cells, one set of battery cell groups is arranged in each installation position, the battery cells are fixedly connected with an inner bottom wall of the box body, and the battery cells located at the two ends of the battery cell group abut against the first side wall and the second side wall; and glue is filled between the battery cell group and the adjacent cross beam to form a glue layer; the glue layer formed by filling glue between the battery cell group and the adjacent cross beam can fix the metal particles remaining in the gap between the battery cell and the cross beam in the glue layer; in addition, since the gap between the battery cell and the cross beam is filled with the glue layer, the metal particles and welding slag generated after the glue filling can be blocked from entering the gap between the battery cell and the cross beam, and the safety performance of the battery pack is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack, in particular to a battery pack, an automobile and a cell mounting method. BACKGROUND

[0002] During the installation process of the battery pack, welding slag or other small metal particles may be generated, for example, small metal particles may be generated in many welding processes and machining processes during the manufacturing process of the battery pack box, small welding slag may be generated between the cells in the battery pack during welding, and small metal particles may also be generated during the installation process of the battery pack and the vehicle body when the bolts are locked and rubbed against the surface of the metal structural part.

[0003] Due to the limitation of the machining precision of the mechanical arm, there is usually a gap of about 1mm between the cells and the cross beam of the CTP battery pack, if the small metal particles enter the gap, the insulation layer of the cell may be pierced, the insulation fails, the cell and the box are connected, and the cell may be overheated, which may cause combustion and explosion, and there is a certain safety hazard. SUMMARY

[0004] Therefore, it is necessary to provide a battery pack, an automobile and a cell mounting method capable of preventing small metal particles from entering the gap between the cells and the cross beam to solve the problem that the small metal particles in the gap between the cells and the cross beam may pierce the insulation layer of the cell and cause safety hazards.

[0005] The present application provides a battery pack, which comprises a box, a cross beam and a cell group; the two ends of the cross beam are fixedly connected with the first side wall and the second side wall of the box, and an installation site is formed between the two adjacent cross beams; the cell group comprises a plurality of cells, one set of the cell group is arranged in each installation site, the cells are fixedly connected with the inner bottom wall of the box, and the cells at the two ends of the cell group are respectively abutted against the first side wall and the second side wall; and the cell group and the adjacent cross beam are filled with glue to form a glue layer.

[0006] The battery pack described above fills the glue between the cell group and the adjacent cross beam to form a glue layer, which can fix the metal particles or welding slag remaining in the gap between the cell and the cross beam in the formed glue layer; in addition, after the glue layer is formed, the gap between the cell and the cross beam is filled with the glue layer, which can play a blocking role, so as to avoid the metal particles or welding slag generated after the glue is filled from entering the gap between the cell and the cross beam, and further improve the safety performance of the battery pack.

[0007] In one of the embodiments, the height of the glue layer is greater than or equal to the height of the crossbeam minus 2mm and less than or equal to the height of the crossbeam plus 3mm, so as to form a containing space on the side of the crossbeam away from the bottom wall of the box by the top wall of the crossbeam, the glue layer and the battery cell.

[0008] It can be understood that the containing space can store the metal particles generated after the glue is poured, and since the width of the containing space is relatively large, the metal particles stored in the containing space are not easily extruded to pierce the insulating layer of the battery cell, thus achieving the effect of improving the safety performance of the battery pack.

[0009] In one of the embodiments, the crossbeam is internally provided with a hollow cavity, at least one partition plate is fixedly arranged in the hollow cavity, so as to divide the hollow cavity into at least two collecting spaces along the direction close to or away from the bottom wall of the box, and the top wall of the crossbeam and each partition plate are provided with a collecting hole penetratingly opened along the direction close to or away from the bottom wall of the box.

[0010] It can be understood that the hollow cavity can collect the metal particles in the containing space, and once the metal particles enter the hollow cavity, it is difficult for them to bounce out of the hollow cavity and into the containing space, thus reducing the number of metal particles in the containing space and reducing or even avoiding the possibility of the insulating layer of the battery cell being pierced by the metal particles in the containing space, further improving the safety performance of the battery pack.

[0011] In one of the embodiments, two partition plates are fixedly arranged in the hollow cavity, so as to divide the hollow cavity into three collecting spaces.

[0012] It can be understood that in this way, the structural strength of the crossbeam and the overall battery pack can meet the requirements, while the overall cost and quality of the battery pack are relatively low.

[0013] In one of the embodiments, the collecting holes opened in the top wall of the crossbeam and each partition plate are directly opposite to each other; or, the collecting holes opened in the top wall of the crossbeam and each partition plate are staggered.

[0014] It can be understood that when the collecting holes are directly opposite to each other, the processing of the crossbeam is facilitated, thereby reducing the production cost; when the collecting holes are staggered, the partition plate has a better blocking effect on the metal particles that have fallen into the collecting space close to the bottom of the crossbeam, thereby better preventing the metal particles in the hollow cavity from bouncing out of the hollow cavity and into the containing space, further improving the safety performance of the battery pack.

[0015] In one of the embodiments, the height of the crossbeam is 60% to 90% of the height of the battery cell.

[0016] In one of the embodiments, the thickness of the glue layer is 1mm to 3mm.

[0017] It can be understood that, in the thickness range, the overall structural strength of the battery pack can meet the requirements, the cost is relatively low, and the metal particles or welding slag remaining in the gap between the cell and the beam can be completely fixed.

[0018] In one embodiment, the glue layer is a polyurethane material.

[0019] It can be understood that the polyurethane material has good heat insulation, sound insulation, and shock resistance, and can protect the cell and increase the safety performance of the battery pack.

[0020] The second aspect of the application provides an automobile comprising the battery pack.

[0021] The third aspect of the application provides a cell mounting method for manufacturing the battery pack, characterized in that it comprises the following steps:

[0022] adhering the cell to the inner bottom wall of the box body of the battery pack;

[0023] filling glue between the cell and the beam to form a glue layer, and the height of the glue layer is not less than the height of the beam. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the three-dimensional structure of the battery pack of the application;

[0025] Figure 2 is a schematic diagram of the top view structure of Figure 1 ; is a schematic diagram of the sectional structure of ; is a schematic diagram of the sectional structure of

[0026] ; is a schematic diagram of the enlarged structure of Figure 3 ; is a schematic diagram of the sectional structure of Figure 2 ; is a schematic diagram of the sectional structure of ; is a schematic diagram of the sectional structure of

[0027] ; is a schematic diagram of the sectional structure of Figure 4 ; is a schematic diagram of the enlarged structure of Figure 3 ; is a schematic diagram of the sectional structure of ; is a schematic diagram of the sectional structure of

[0028] ; is a schematic diagram of the sectional structure of Figure 5 ; is a schematic diagram of the sectional structure of Figure 4 ; is a schematic diagram of the sectional structure of ; is a schematic diagram of the sectional structure of

[0029] Reference signs: 10, box body; 11, first side wall; 12, second side wall; 20, beam; 21, hollow cavity; 211, collection space; 22, partition; 221, collection hole; 30, cell group; 31, cell; 40, glue layer; 1, accommodation space. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described below in detail with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in many different ways from what is described herein, and should not be construed as being limited to the embodiments set forth herein, but should be understood to include all possible embodiments.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.

[0032] In addition, the terms "first", "second", "third" and the like are used only for descriptive purposes, and should not be construed as indicating or implying relative importance or implying a specified number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0033] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0035] It is to be understood that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that, when a part is referred to as being "fixed to" or "set on" another part, it can be directly on the other part or there can be an intervening part. When a part is referred to as being "connected to" another part, it can be directly connected to the other part or there can be an intervening part. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are intended for purposes of description only and are not intended to be limiting.

[0036] Referring to Figures 1 to 4 The present application provides a battery pack, comprising a box 10, a crossbeam 20 and a cell group 30; the two ends of the crossbeam 20 are fixedly connected with the first side wall 11 and the second side wall 12 of the box 10 (here, the first side wall 11 and the second side wall 12 refer to a pair of inner side walls of the box 10), and an installation site is formed between adjacent crossbeams 20; the cell group 30 comprises a plurality of cells 31, and a group of cell groups 30 is arranged in each installation site; the cell 31 is fixedly connected with the inner bottom wall of the box 10, and the cells 31 at the two ends of the cell group 30 are respectively abutted against the first side wall 11 and the second side wall 12; and the cell group 30 and the adjacent crossbeam 20 are filled with glue to form a glue layer 40.

[0037] There are mainly three cases of metal particles or welding slag generated in the process of installing the battery pack: 1. The manufacturing process of the box 10 of the battery pack includes more welding and machining processes, and metal particles or welding slag may be left in the box 10 after the machining is completed; 2. In the process of welding the cell 31 through aluminum material, welding slag may be generated; 3. When the battery pack is locked and fixed with the vehicle body through screws or other ways, metal particles may be generated by friction on the surface of the metal structure.

[0038] In the present application, by filling glue between the cell group 30 and the adjacent crossbeam 20 to form a glue layer 40, the metal particles or welding slag left in the gap between the cell 31 and the crossbeam 20 in the first case can be fixed in the formed glue layer 40, thereby avoiding the residual metal particles in the small gap from causing the insulation layer of the cell 31 to be pierced due to external pressure or other reasons, leading to thermal imbalance of the cell 31, and even causing combustion and explosion, so as to improve the safety performance of the battery pack.

[0039] In addition, after the glue layer 40 is formed, the gap between the cell 31 and the crossbeam 20 is filled with the glue layer 40, which can play a blocking role, thereby avoiding the metal particles or welding slag generated in the second case, the third case or due to other reasons from entering the gap between the cell 31 and the crossbeam 20, further improving the safety performance of the battery pack.

[0040] Referring toFigure 4 As shown in some embodiments, the height of the glue layer 40 is ≥ the height of the crossbeam 20 - 2mm, and the height of the glue layer 40 is ≤ the height of the crossbeam 20 + 3mm, so as to form a containing space 1 on the side of the crossbeam 20 away from the bottom wall of the box 10 by the top wall of the crossbeam 20, the glue layer 40 and the battery cell 31.

[0041] Since the welding position of the battery cell 31 in the second case is on the side away from the bottom wall of the box 10, the welding slag generated will fall into the containing space 1 under the action of gravity, and the same applies to the third case. Since the width of the containing space 1 is relatively large (greater than the width of the crossbeam 20), the metal particles or welding slag falling into the containing space 1 are not easily extruded, and the possibility of piercing the insulating layer of the battery cell 31 to cause combustion and explosion is relatively small, thereby achieving the effect of improving the safety performance of the battery pack.

[0042] The height of the glue layer 40 is ≥ the height of the crossbeam 20 - 2mm, so as to avoid the possibility of metal particles or welding slag entering the gap between the glue layer 40 and the top wall of the crossbeam 20 due to the low height of the glue layer 40, thereby improving the safety performance of the battery pack.

[0043] In some embodiments, the height of the glue layer 40 is greater than the height of the crossbeam 20, and the part of the glue layer 40 protruding from the crossbeam 20 covers and fixes the side surface of the battery cell 31, which can play a protective role for the battery cell, preventing the metal particles or welding slag in the containing space 1 from contacting the insulating layer on the surface of the battery cell 31, and eliminating the possibility of the metal particles or welding slag piercing the insulating layer of the battery cell 31, thereby further improving the safety performance of the battery pack. At the same time, the height of the glue layer 40 is ≤ the height of the crossbeam 20 + 3mm, i.e. the height of the part of the glue layer 40 protruding from the crossbeam 20 is ≤ 3mm. Within this height range, the self-weight of the glue layer 40 exceeding the crossbeam 20 is less than its surface tension and cannot overcome its surface tension to flow to the top wall of the crossbeam 20, so as to avoid the situation of the glue layer 40 blocking the collection hole 221.

[0044] Please refer to Figure 4 and Figure 5 In some embodiments, a hollow cavity 21 is arranged in the crossbeam 20, and at least one partition plate 22 is fixedly arranged in the hollow cavity 21 to divide the hollow cavity 21 into at least two collection spaces 211 along the direction close to or away from the bottom wall of the box 10. The top wall of the crossbeam 20 and each partition plate 22 are both provided with a collection hole 221 penetrating along the direction close to or away from the bottom wall of the box 10.

[0045] The collection space 211 and the collection hole 221 provided along the direction close to or away from the bottom wall of the box 10 enable the metal particles or welding slag in the containing space 1 to fall into the hollow cavity 21 under the action of gravity and external vibration, and gradually fall into the collection space 211 close to the bottom wall of the box 10, thereby achieving the effect of collecting the metal particles in the containing space 1.

[0046] And due to the self-weight effect, the metal particles in the collection space 211 near the bottom of the cross beam 20 are more difficult to bounce out to the collection space 211 near the top of the cross beam 20, that is, once the metal particles enter the hollow cavity 21, it is difficult for them to bounce out of the hollow cavity 21 to the accommodation space 1, thereby reducing the number of metal particles in the accommodation space 1, reducing or even avoiding the possibility of the insulation layer of the battery cell 31 being pierced by the metal particles in the accommodation space 1, and further improving the safety performance of the battery pack.

[0047] In addition, the partition plate 22 can also increase the structural strength of the cross beam 20, and the design of the hollow cavity 21 in cooperation with the partition plate 22 can reduce the weight of the cross beam 20 while ensuring the structural strength of the cross beam 20, thereby achieving the effect of reducing the overall weight of the battery pack.

[0048] In some embodiments, the cross-sectional shape of the collection space 211 includes but is not limited to quadrilateral, triangle, trapezoid and the like, as long as each collection space 211 in the same cross beam 20 is distributed along the direction close to or away from the bottom wall of the box 10.

[0049] In some embodiments, the height of the glue layer 40 is equal to the height of the cross beam 20. Due to the presence of the collection hole 221, the metal particles in the accommodation space 1 will eventually be collected into the hollow cavity 21 under the action of gravity, without considering the possibility of the metal particles in the accommodation space 1 piercing the insulation layer, therefore, by setting the height of the glue layer 40 to be equal to the height of the cross beam 20, the amount of glue can be reduced under the premise of ensuring the safety performance of the battery pack, thereby achieving the effect of reducing the raw material cost.

[0050] Please refer to Figure 4 and Figure 5 shown, in some embodiments, two partition plates 22 are fixedly arranged in the hollow cavity 21 to divide the hollow cavity 21 into three collection spaces 211.

[0051] In this way, the structural strength of the cross beam 20 and the overall battery pack can meet the requirements, while the overall cost and quality of the battery pack are relatively low.

[0052] Of course, in other embodiments, other numbers of partition plates 22 can also be fixedly arranged in the hollow cavity 21, as long as the collection spaces 211 formed by the partition plates 211 are distributed along the direction close to or away from the bottom wall of the box 10, which is not limited further in this application.

[0053] Please refer to Figure 5 shown, in some embodiments, the collection holes 221 opened in the top wall of the cross beam 20 and each partition plate 22 are opened opposite to each other; or, the collection holes 221 opened in the top wall of the cross beam 20 and each partition plate 22 are staggered.

[0054] The collecting holes 221 are arranged opposite to each other, facilitating the machining of the cross beam 20 and reducing the production cost.

[0055] The collecting holes 221 are arranged opposite to each other, facilitating the machining of the cross beam 20 and reducing the production cost.

[0056] In some embodiments, at least part of the collecting holes 221 are arranged opposite to each other, and the bottom wall of the cross beam 20 is provided with bolt through holes corresponding to the part of the collecting holes 221, and the bottom wall of the box body 10 is provided with bolt holes corresponding to the bolt through holes. The cross beam 20 can be fixed to the bottom wall of the box body 10 by screwing the bolt through holes and the bolt through holes to the bolt holes of the bottom wall of the box body 10, facilitating the assembly and disassembly of the cross beam 20.

[0057] Please refer to Figure 4 In some embodiments, the height of the cross beam 20 is 60% to 90% of the height of the battery cell 31.

[0058] If the height of the cross beam 20 is too low compared to the battery cell 31, the overall structural strength of the battery pack cannot be guaranteed, and there is a certain safety hazard. Conversely, if the height of the cross beam 20 is too high compared to the battery cell 31, on the one hand, the cross beam 20 may be in conduction with other power supply components at the top of the box body 10, thereby affecting the normal operation of the battery pack, and on the other hand, it will also lead to the overall mass of the battery pack being too large.

[0059] Please refer to Figure 4 In some embodiments, the thickness of the glue layer 40 is 1mm to 3mm.

[0060] If the thickness of the glue layer 40 is less than 1mm, the metal particles or welding slag in the gap between the battery cell 31 and the cross beam 20 cannot be completely fixed, and there is still a risk of metal particles piercing the insulating layer of the battery cell 31.

[0061] Conversely, the thickness of the glue layer 40 increases, and the width of the cross beam 20 decreases accordingly, thereby causing the overall structural strength of the battery pack to decrease. If the thickness of the glue layer 40 is greater than 3mm, the overall structural strength of the battery pack will be too low, and there will be a certain safety hazard. In addition, the thickness of the glue layer 40 is too large, which will also increase the amount of glue, thereby increasing the cost.

[0062] In some embodiments, the glue layer 40 is made of polyurethane material, which has good heat insulation, sound insulation and shock resistance, and can play a protective role for the battery cell 31, thereby increasing the safety performance of the battery pack.

[0063] The second aspect of the present application provides an automobile comprising the above-mentioned battery pack.

[0064] The third aspect of the present application provides a method for installing an electric core, which is used for manufacturing the battery pack, and comprises the following steps:

[0065] attaching the electric core to the inner bottom wall of the box body of the battery pack;

[0066] filling glue between the electric core and the cross beam to form a glue layer, and the height of the glue layer is not less than the height of the cross beam.

[0067] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0068] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A battery pack, characterized in that, It includes a housing (10), crossbeams (20), and battery cell assembly (30); an installation position is formed between two adjacent crossbeams (20); the battery cell assembly (30) includes multiple battery cells (31), and a set of the battery cell assembly (30) is provided in each installation position; The cell assembly (30) and the adjacent crossbeam (20) are filled with adhesive to form an adhesive layer (40). The battery cell (31), the adhesive layer (40) and the top wall of the crossbeam (20) form an accommodating space (1) on the side of the crossbeam (20) away from the bottom wall of the box (10). The crossbeam (20) is provided with a hollow cavity (21), and at least one partition (22) is fixedly provided in the hollow cavity (21) to divide the hollow cavity (21) into at least two collection spaces (211) along the direction close to or away from the bottom wall of the box (10). The top wall of the crossbeam (20) and each partition (22) are provided with collection holes (221) through the crossbeam (20) along the direction close to or away from the bottom wall of the box (10).

2. The battery pack according to claim 1, characterized in that, The height of the adhesive layer (40) is greater than or equal to the height of the crossbeam (20) minus 2mm, and the height of the adhesive layer (40) is less than or equal to the height of the crossbeam (20) plus 3mm.

3. The battery pack according to claim 1, characterized in that, Two partitions (22) are fixed inside the hollow cavity (21) to divide the hollow cavity (21) into three collection spaces (211).

4. The battery pack according to claim 1, characterized in that, The top wall of the beam (20) and the collection holes (221) of each partition (22) are directly opposite each other; or the top wall of the beam (20) and the collection holes (221) of each partition (22) are staggered.

5. The battery pack according to claim 1, characterized in that, The height of the crossbeam (20) is 60% to 90% of the height of the battery cell (31).

6. The battery pack according to claim 1, characterized in that, The thickness of the adhesive layer (40) is 1mm to 3mm.

7. The battery pack according to claim 1, characterized in that, The adhesive layer (40) is made of polyurethane.

8. A car, characterized in that, Includes the battery pack as described in any one of claims 1 to 7.

9. A cell mounting method for manufacturing a battery pack according to any one of claims 1 to 7, characterized in that, Includes the following steps: The battery cells are bonded to the inner bottom wall of the battery pack casing; Adhesive is poured between the battery cell and the crossbeam to form an adhesive layer, and the height of the adhesive layer is not less than the height of the crossbeam.

Images