Battery pack and battery device

Abstract

The utility model relates to a battery pack and battery device, the battery pack includes battery cell, box body and polystyrene foam, the box body accommodates and supports a plurality of battery cells, the box body includes bottom surface, side surface and a plurality of first reinforcing ribs, the plurality of first reinforcing ribs are arranged on the bottom surface of the box body towards the side part of the battery cell and extend along the height direction of the battery cell, and the first reinforcing ribs are arranged on the side surface of the box body towards the side part of the battery cell. The first reinforcing ribs respectively abut against the inner side surface of the box body and the outer side surface of the battery cell; the polystyrene foam is filled in a gap between the inner side surface of the box body and the outer side surfaces of the plurality of battery cells, and the plurality of battery cells are wrapped in the polystyrene foam; wherein at least one first reinforcing rib group is propped against the outer side surface of each battery cell, and each first reinforcing rib group comprises at least two first reinforcing ribs. According to the battery pack, the stability of the positions of the battery cells can be improved in the battery cell stacking process, and meanwhile, the first reinforcing ribs extend in the height direction of the battery cells, so that the contact area between the first reinforcing ribs and the polystyrene foam is larger, the contact area between the polystyrene foam and the box body can be increased, the structural strength is improved, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack and a battery device. Background Art

[0002] In the related technology, it is relatively common to use square cells in 12V low-voltage battery packs. Square cells require relatively more protection points. For example, in the assembly structure, foam is needed to be used to block the square cells to prevent glue from penetrating into the large surface of the cell and affecting the expansion of the cell. For another example, the cell module of the square cell needs to be wrapped with strong adhesive single-sided tape to form a small module, and then welded into the box. There are many types of glue used and the process is complicated.

[0003] In addition, a small number of 12V low-voltage battery packs use cylindrical cells. For cylindrical cells, due to the imperfect use process of low-voltage battery packs, the entire battery pack is similar to the assembly method of TV remote control batteries in structure, and the battery pack is not integrated inside, resulting in poor structural strength of the battery pack and low safety factor. Therefore, how to further improve the structural strength of the battery pack is an urgent problem to be solved. Utility Model Content

[0004] In view of this, the utility model proposes a battery pack and a battery device, which can increase the stability of the position of the battery cells during the battery cell stacking process. At the same time, multiple first reinforcing ribs extend along the height direction of the battery cells, so that the multiple first reinforcing ribs and the foam glue have a larger contact area, thereby increasing the contact area between the foam glue and the box body, increasing the structural strength, and improving the safety of the battery pack.

[0005] According to one aspect of the utility model, a battery pack is provided, comprising a battery cell, a case and foam glue, the case accommodating and supporting a plurality of the battery cells, the case comprising a bottom surface, a side surface and a plurality of first reinforcing ribs, the plurality of first reinforcing ribs being arranged on the bottom surface of the case facing the side of the battery cell and extending along the height direction of the battery cell, the first reinforcing ribs respectively abutting against the inner side surface of the case and the outer side surface of the battery cell; the foam glue fills the gap between the inner side surface of the case and the outer side surfaces of the plurality of battery cells, and the plurality of battery cells are wrapped in the foam glue; wherein, the outer side surface of each of the battery cells abuts against at least one first reinforcing rib group, and the first reinforcing rib group includes at least two of the first reinforcing ribs.

[0006] According to another aspect of the present invention, a battery device is provided, and the battery device includes the battery pack.

[0007] By arranging multiple first reinforcing ribs in the box body, the multiple first reinforcing ribs are arranged on the bottom surface of the box body facing the side of the battery cell and extend along the height direction of the battery cell. The first reinforcing ribs are respectively abutted against the inner side surface of the box body and the outer side surface of the battery cell. According to various aspects of the utility model, the stability of the position of the battery cells can be increased during the battery cell stacking process. At the same time, the multiple first reinforcing ribs extend along the height direction of the battery cell, so that the multiple first reinforcing ribs have a larger contact area with the foam glue, thereby increasing the contact area between the foam glue and the box body, increasing the structural strength, and improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0009] Figure 1 An exploded schematic diagram of a battery pack according to an embodiment of the utility model is shown.

[0010] Figure 2a A schematic top view of the first reinforcing rib 201 according to an embodiment of the utility model is shown.

[0011] Figure 2b A three-dimensional schematic diagram of the first reinforcing rib 201 of the embodiment of the application is shown.

[0012] Figure 3 A schematic diagram showing the bottle stopper structure of an embodiment of the utility model.

[0013] Figure 4 A side view of the battery pack after installation is shown according to an embodiment of the present invention.

[0014] Figure 5 A cross-sectional view of the battery pack after installation is shown according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0016] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0017] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0018] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials. In some instances, methods, means, components and circuits well known to those skilled in the art are not described in detail, so as to highlight the main purpose of the utility model.

[0019] Figure 1 The exploded schematic diagram of the battery pack of the present utility model embodiment is shown. Figure 1As shown, the battery pack 10 of the utility model includes a battery cell 100, a box body 200 and a foam glue 300. The multiple battery cells 100 are located in the box body 200, and the box body 200 accommodates and supports the multiple battery cells 100. The injected foam glue 300 fills the gap between the inner side of the box body 200 and the outer side of the multiple battery cells 100, so that the entire battery pack is formed into one body. The multiple battery cells 100 are wrapped in the foam glue 300.

[0020] In one embodiment, the box body 200 includes a bottom surface 271 and a side surface 272, and the side surface 272 of the box body 200 is arranged around a circle. The bottom surface 271 of the box body 200 and the side surface 272 of the box body 200 are integrally formed to form a structure with an opening, and the opening is used for placing the foam 300 and the multiple battery cells 100.

[0021] In one embodiment, the box body 200 includes a plurality of first reinforcing ribs 201, and the plurality of first reinforcing ribs 201 are arranged on the bottom surface 271 of the box body 200 facing the side of the battery cell 100, and the plurality of first reinforcing ribs constitute the first multi-rib structure of the utility model. The plurality of first reinforcing ribs 201 extend along the height direction of the battery cell 100 and abut against the outer side surface of the battery cell 100. In this way, by arranging a multi-rib structure in the box body 200 to abut against the outer side surface of the battery cell 100, the stability of the position of the battery cell 100 can be increased during the stacking process of the battery cell 100, and the battery cell 100 can be prevented from being offset during the movement of the battery pack, which affects the welding. At the same time, the plurality of first reinforcing ribs 201 extend along the height direction of the battery cell 100, so that the plurality of first reinforcing ribs 201 have a larger contact area with the foam glue 300, thereby increasing the contact area between the foam glue 300 and the box body 200 and increasing the structural strength.

[0022] Figure 2a A schematic top view of the first reinforcing rib 201 of an embodiment of the utility model is shown. Figure 2b A three-dimensional schematic diagram of the first reinforcing rib 201 of the embodiment of the application is shown. Figure 2a and Figure 2b The first reinforcing rib 201 may be a planar structure along the height direction of the battery cell 100 , and the first reinforcing rib 201 abuts against the inner side surface of the box body 200 and the outer side surface of the battery cell 100 , respectively.

[0023] At least one first reinforcing rib group is abutted against the outer side surface of each battery cell 100, and the first reinforcing rib group includes at least two first reinforcing ribs 201. In the first reinforcing rib group, the two first reinforcing ribs 201 abutted against the outer side surface of each battery cell 100 are mirror-imaged relative to the first symmetry axis 231 of the battery cell 100, and the first symmetry axis 231 of the battery cell 100 may be a straight line parallel to the first side 221 of the box body 200.

[0024] In one embodiment, the outer side surface of each battery cell 100 is abutted with two first reinforcing rib groups, and the two first reinforcing rib groups abutted with the outer side surface of each battery cell 100 are mirror-imaged relative to the second symmetry axis 232 of the battery cell 100. The second symmetry axis 232 of the battery cell 100 may be a straight line parallel to the second side 222 of the box body 200, and the second side 222 intersects with the first side 221. Optionally, the second side 222 is perpendicular to the first side 221. Exemplarily, the first side 221 may be Figure 2a The short side of the box body 200, that is, the side extending in the vertical direction, the second side 222 may be Figure 2a The long side of the box body 200, that is, the side extending in the horizontal direction.

[0025] In one embodiment, among the plurality of first reinforcing ribs 201 of two adjacent battery cells 100, two adjacent first reinforcing ribs 201 facing the same side of the box body 200 are cross-arranged, and the intersection is located on the same side of the box body 200. In other words, the adjacent two cross-arranged first reinforcing ribs 201 abutting on the same side respectively abut against the two adjacent battery cells 100. Optionally, among the adjacent two cross-arranged first reinforcing ribs 201 abutting on the same side, the abutting length of each first reinforcing rib 201 from the inner side surface of the box body 200 to the outer side surface of the corresponding battery cell 100 is equal.

[0026] Exemplarily, the first reinforcing rib 201, the first reinforcing rib 202, the first reinforcing rib 203, and the first reinforcing rib 204 are all in contact with the battery cell installed in the opening 230, and the first reinforcing rib 201 is mirror-imaged with respect to the first symmetry axis 231 of the first reinforcing rib 202, and the first reinforcing rib 201 and the first reinforcing rib 203 are mirror-imaged with respect to the second symmetry axis 232. The first reinforcing rib 202 and the first reinforcing rib 205 are cross-arranged.

[0027] In one embodiment, the first reinforcing rib 201 of at least one of the battery cells 100 abuts against the junction of the first side 221 and the second side 222. Taking the side 272 of the box body 200 as a rectangular surface as an example, the side of the box body 200 includes four sides, namely two first sides 221 and two second sides 222. At this time, the four first reinforcing ribs 201 of the two battery cells 100 abut against the four corners of the rectangle, which can further make the structure of the box body 200 more stable.

[0028] In one embodiment, the box body 200 includes at least two second reinforcing ribs 210, and at least two of the second reinforcing ribs 210 are arranged on the bottom surface 271 of the box body 200 facing the side of the battery cell 100, and abut against the first edge 221, and at least two of the second reinforcing ribs 210 constitute the second multi-rib structure of the utility model. The second reinforcing rib 210 may be parallel to the second edge 222. At least two of the second reinforcing ribs 210 extend along the height direction of the battery cell 100 and abut against the outer side surface of the battery cell 100, so as to further increase the stability of the position of the battery cell 100 during the stacking process of the battery cell 100 and increase the contact area between the foam 300 and the box body 200.

[0029] In one embodiment, among the multiple battery cells 100 of the battery pack, each of the battery cells 100 may be a cylindrical battery cell 100. Exemplarily, the battery cell 100 may be a 4695 type battery cell 100. The height of the foam glue 300 is flush with the upper surface of the battery cell 100 (i.e., the "shoulder" of the battery cell 100). In this way, since the foaming height of the foam glue 300 is flush with the shoulder of the battery cell 100, the problem of the structural glue pressing area reaching 100% of the side of the battery cell 100 in the related art is solved.

[0030] In the related art, glue with high structural strength is generally used to glue the sides of the battery cell. The sides of the battery cell are arc-shaped. After the structural glue is pressed open, it needs to cover the entire side of the battery cell, and the adhesive strength is reduced accordingly. In the present utility model, the foam glue 300 has good fluidity and a high foaming coefficient, which is 6-7 times the original volume. In this way, the foam glue 300 can effectively fill the cavity of the box 200, so that the entire module is integrated and the structural strength is enhanced. In addition, the foam glue 300 can also play a shock-absorbing role, which can buffer the vibration generated during driving and improve safety performance.

[0031] In one embodiment, the bottom surface 271 of the box body 200 is provided with a plurality of openings 230, and the battery cells 100 are installed in the openings 230. Exemplarily, each of the openings 230 accommodates one of the battery cells 100. Since the openings 230 are used to accommodate the battery cells 100, and the first reinforcing ribs 201 abut against the outer side of the battery cells 100, the first reinforcing ribs 201 also contact the openings 230. In order to accommodate the battery cells 100, the openings can be set as stepped rings.

[0032] Figure 3 A schematic diagram showing the bottle stopper structure of an embodiment of the utility model.

[0033] In one embodiment, if Figure 3 As shown, the battery pack also includes a plurality of explosion-proof valves 400, which are installed in the openings 230 and abut against the bottom surface of the battery cell 100. The explosion-proof valves 400 and the openings 230 together form a bottle stopper structure. The provision of a plurality of openings 230 can reserve an installation position for each explosion-proof valve 400, so that the explosion-proof valves 400 do not interfere with each other. Moreover, each battery cell 100 has a corresponding explosion-proof valve 400 at the bottom, which is different from the related art in that there is no pressure relief device installed in the battery pack, which poses a great safety hazard. The embodiment of the utility model can prevent the failure of other battery cells 100 caused by abnormal conditions in a single battery cell 100, thereby improving the safety of the battery pack. The explosion-proof valve 400 adopts a bottle stopper structure with a simple structure, making the battery pack safer and more reliable.

[0034] In one embodiment, the box 200 includes a plurality of protrusions 241, which are cylindrical and adapted to the size of the opening. The protrusions 241 are arranged on the side of the bottom surface 271 of the box 200 away from the battery cell 100, and are in contact with the bottom surface 271 of the box 200. A grid is arranged between two protrusions 241, and the plurality of grids confine the plurality of protrusions 241 within a grid area.

[0035] The box body 200 includes a plurality of third reinforcing ribs 251, which are arranged on the side of the bottom surface 271 of the box body 200 away from the battery cell 100, and the plurality of third reinforcing ribs 251 constitute the third multi-rib structure of the utility model. The plurality of third reinforcing ribs 251 extend along the height direction of the battery cell 100 and abut against the bottom surface of the battery cell 100. Among them, the adjacent plurality of third reinforcing ribs 251 of two adjacent protrusions 241 are mirror-imaged relative to the grille 242, and the two third reinforcing ribs 251 located on the same side of the two adjacent protrusions 241 cross the end of the grille. Exemplarily, the third reinforcing ribs 251 and the third reinforcing ribs 252 are mirror-imaged relative to the grille 242. In this way, by arranging the third multi-rib structure in the box body 200, the structural strength of the box body 200 can be further increased.

[0036] Exemplarily, the third reinforcing rib 252 is arranged in a mirror image with respect to the first symmetry axis 231 of the first reinforcing rib 202, and the first reinforcing rib 201 and the first reinforcing rib 203 are arranged in a mirror image with respect to the second symmetry axis 232. The first reinforcing rib 202 and the first reinforcing rib 205 are arranged crosswise.

[0037] Figure 4 A side view of the battery pack after installation is shown according to an embodiment of the present invention.

[0038] In one embodiment, the battery pack further includes a positive electrode column 261 and a negative electrode column 262 disposed on the outer surface of the box body 200. The battery pack may be a low-voltage battery pack, for example, a low-voltage battery pack in which the voltage between the positive electrode column 261 and the negative electrode column 262 is 12V. The voltage specification between the positive electrode column 261 and the negative electrode column 262 of the battery pack may be selected as required, and the present invention is not limited thereto.

[0039] In one embodiment, if Figure 1 As shown, a tab 101 is provided on the upper surface of the battery cell 100, and multiple tabs 101 of multiple battery cells 100 are connected to each other. Among them, at least one tab 101 of the battery cell 100 is connected to the positive electrode column 261, and at least one tab 101 of the battery cell 100 is connected to the negative electrode column 262.

[0040] Figure 5 The cross-sectional view of the battery pack after installation of the embodiment of the utility model is shown. Figure 5 As shown, Figure 4 The AA line is used as the cutting line, and the obtained battery pack cross section is as follows Figure 5 shown.

[0041] In one embodiment, if Figure 5As shown, the upper surface of the battery cell 100 is blocked from the explosion-proof valve 400 by using a sealing rubber 602, so that the explosion-proof valve 400 can work normally. In addition, a double-sided adhesive sealing tape 601 is used to seal the bottom of the battery cell 100 at the bottom of the box 200. The battery cell 100 is given initial adhesion during the pre-stacking process to prevent the battery cell 100 from being displaced during the movement of the box 200. In the present utility model, both the sealing rubber 602 and the sealing tape 601 can be called sealants, and the same material can be used. In this way, since only two types of glue (sealant and foam glue 300) are used, the group stacking process and structure of the entire battery pack are simpler. Moreover, the sealant can also prevent the foam glue 300 from overflowing to the explosion-proof valve 400, reducing the risk of the explosion-proof valve 400 being triggered and not started.

[0042] In one embodiment, the battery pack further includes an upper cover 500, and the upper cover 500 covers the plurality of battery cells 100. It should be noted that from the perspective of production technology, compared with the multiple processes of first applying glue to the serpentine tube - bonding with the battery cell 100 - curing - stacking into groups - and then hoisting into boxes in the industry, the utility model can directly put the plurality of battery cells 100 into boxes, eliminating the need to put the battery module into the box, making the process simpler and the production efficiency higher.

[0043] In summary, by using injected foam to fill the gaps in the box, the entire battery pack is formed into one piece, and the battery cells and the box use foam, and the foam is in large-area contact with the box rib structure, thereby improving the overall structural strength of the battery pack and reducing the production cost of the battery pack. At the same time, the grouping process is simplified, making it more assembleable and convenient for mass production, thereby improving product competitiveness in terms of cost and safety.

[0044] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0045] The battery pack and battery device provided in the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present invention. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, characterized in that: include: Battery cell (100); A box (200) is used to accommodate and support the plurality of battery cells (100); the box (200) comprises a bottom surface (271), a side surface (272), and a plurality of first reinforcing ribs (201); the plurality of first reinforcing ribs (201) are arranged on the side of the bottom surface (271) of the box (200) facing the battery cells (100) and extend along the height direction of the battery cells (100); the first reinforcing ribs (201) are respectively in contact with the inner side surface of the box (200) and the outer side surface of the battery cells (100); A foam glue (300) is filled in the gap between the inner side surface of the box body (200) and the outer side surfaces of the plurality of battery cells (100), and the plurality of battery cells (100) are wrapped in the foam glue (300); Wherein, the outer side surface of each of the battery cells (100) is abutted against at least one first reinforcing rib group, and the first reinforcing rib group includes at least two first reinforcing ribs (201).

2. The battery pack according to claim 1, characterized in that: In the first reinforcing rib group, two first reinforcing ribs (201) abutting against the outer side surface of each battery cell (100) are arranged in a mirror image relative to a first symmetry axis (231) of the battery cell (100), and the first symmetry axis (231) of the battery cell (100) is a straight line parallel to the first side (221) of the box body (200).

3. The battery pack according to claim 2, characterized in that: The outer side surface of each battery cell (100) is butted against two first reinforcing rib groups, and the two first reinforcing rib groups butted against the outer side surface of each battery cell (100) are arranged in a mirror image with respect to a second symmetry axis (232) of the battery cell (100), and the second symmetry axis (232) of the battery cell (100) is a straight line parallel to a second side (222) of the box body (200), and the second side (222) intersects with the first side (221).

4. The battery pack according to claim 3, characterized in that: Among the plurality of first reinforcing ribs (201) of two adjacent battery cells (100), two adjacent first reinforcing ribs (201) facing the same side of the box body (200) are cross-arranged, and the intersection is located on the same side of the box body (200), and the first reinforcing rib (201) of at least one battery cell (100) abuts against the junction of the first side (221) and the second side (222).

5. The battery pack according to claim 4, characterized in that: The box body (200) comprises at least two second reinforcing ribs (210), and at least two of the second reinforcing ribs (210) are arranged on the bottom surface of the box body (200) facing the side of the battery cell (100) and abutting against the first edge (221), wherein the second reinforcing ribs (210) are parallel to the second edge (222), and at least two of the second reinforcing ribs (210) extend along the height direction of the battery cell (100) and abut against the outer side surface of the battery cell (100).

6. The battery pack according to claim 5, characterized in that: The bottom surface of the box body (200) is provided with a plurality of openings (230), and the battery pack further comprises a plurality of explosion-proof valves (400). The explosion-proof valves (400) are installed in the openings (230) and abut against the bottom surface of the battery cell (100), and the explosion-proof valves (400) and the openings (230) together form a bottle stopper-type structure.

7. The battery pack according to claim 6, characterized in that: The box body (200) comprises a plurality of convex portions (241), wherein the convex portions (241) are arranged on the side of the bottom surface of the box body (200) away from the battery cell (100) and in contact with the bottom surface of the box body (200), and a grid (242) is arranged between two convex portions (241), and the plurality of grids (242) confine the plurality of convex portions (241) within a grid area.

8. The battery pack according to claim 7, characterized in that: The box body (200) comprises a plurality of third reinforcing ribs (251), wherein the plurality of third reinforcing ribs (251) are arranged on the side of the bottom surface of the box body (200) away from the battery cell (100), and the plurality of third reinforcing ribs (251) extend along the height direction of the battery cell (100) and abut against the bottom surface of the battery cell (100), wherein the plurality of adjacent third reinforcing ribs (251) of two adjacent protrusions (241) are arranged in a mirror image with respect to the grille (242), and the two third reinforcing ribs (251) of the two adjacent protrusions (241) located on the same side cross at the end of the grille (242).

9. The battery pack according to claim 8, characterized in that: The area between the upper surface of the battery core (100) and the explosion-proof valve (400) is sealed by sealant, and the bottom of the battery core (100) is sealed by sealant.

10. A battery device, characterized in that: The battery device comprises a battery pack as described in any one of claims 1-9.

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