Battery box

Abstract

The utility model discloses a battery box, and belongs to the technical field of batteries, and the battery box comprises a box body with an accommodating cavity; the plurality of single batteries are arranged in the accommodating cavity; the heat dissipation rib plate is arranged in the accommodating cavity, and the heat dissipation rib plate is connected with the plurality of single batteries and the box body in a heat conduction manner so as to transfer heat generated by the single batteries to the box body; heat generated in the charging and discharging process of the single batteries is transferred to the box body through the heat dissipation rib plates, and the heat is taken away through heat exchange between the box body and external air, so that the single batteries are cooled, the situation that the heat generated by the single batteries is continuously accumulated around the single batteries is reduced, and the service life of the single batteries is prolonged. Therefore, the ambient temperature around the single battery is maintained within a certain range, and the probability of thermal runaway of the single battery is reduced.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery box. Background Art

[0002] Battery cells mainly store and release electrical energy in energy storage systems. Since battery cells generate a lot of heat during the charging and discharging process, this heat will continue to accumulate in the environment around the battery cells, thereby increasing the ambient temperature of the battery cells and increasing the probability of thermal runaway of the battery cells. Utility Model Content

[0003] Purpose of the utility model: The embodiment of the present application provides a battery box, which aims to solve the technical problem that the heat generated by the battery cells during the charging and discharging process will increase the ambient temperature of the battery cells and increase the probability of thermal runaway of the battery cells.

[0004] Technical solution: The battery box described in the embodiment of the present application includes:

[0005] A box body having a receiving cavity;

[0006] A plurality of single cells are disposed in the accommodating cavity, and the plurality of single cells are arranged in a row along a first direction;

[0007] The heat dissipation ribs are arranged in the accommodating cavity, and there is at least one heat dissipation rib on each side of the single battery. The heat dissipation ribs thermally connect the multiple single batteries and the box body to transfer the heat generated by the single batteries to the box body.

[0008] In some embodiments, the heat dissipation ribs include:

[0009] a first plate body, thermally connected to the plurality of single cells;

[0010] The ribs are arranged on a side of the first plate away from the single battery and are respectively thermally connected to the first plate and the inner wall of the box.

[0011] In some embodiments, the heat dissipation ribs further include:

[0012] The second plate is arranged on a side of the rib away from the first plate, and the second plate is thermally connected to the rib and the inner wall of the box respectively.

[0013] In some embodiments, the heat dissipation rib plate includes a plurality of ribs, two adjacent ribs are spaced apart from each other, and each rib is connected to the second plate body.

[0014] In some embodiments, the heat dissipation rib plate includes a plurality of ribs, two adjacent ribs are spaced apart from each other, and each rib is connected to the second plate body.

[0015] In some embodiments, the first plate and the single cell are spaced apart, the heat dissipation ribs further include a heat conductive layer, the heat conductive layer is disposed between the first plate and the single cell, and the first plate is thermally connected to the single cell via the heat conductive layer.

[0016] In some embodiments, the first plate is extended along the first direction;

[0017] The heat dissipation rib plate further includes a first baffle and a second baffle spaced apart in the first direction, wherein the first baffle and the second baffle are disposed on a side of the first plate body close to the single battery cell and are respectively connected to the first plate body;

[0018] The heat conducting layer extends along the first direction and is located between the first baffle and the second baffle.

[0019] In some embodiments, the first baffle and the second baffle are both spaced apart from the single battery;

[0020] Alternatively, both the first baffle and the second baffle are connected to the single battery.

[0021] In some embodiments, the materials of the first baffle and the second baffle are elastic.

[0022] In some embodiments, the battery box includes multiple rows of single cells, and the multiple rows of single cells are arranged along a second direction and connected to each other. The second direction intersects with the first direction. There are multiple heat dissipation ribs, and there is at least one heat dissipation rib on each side of the multiple rows of single cells along the second direction. The heat dissipation ribs are thermally connected to the single cells and the inner wall of the box respectively.

[0023] In some embodiments, the ribs extend along the second direction;

[0024] Alternatively, the ribs are wavy;

[0025] Alternatively, there are a plurality of ribs, and at least one rib is arranged to cross with its adjacent ribs.

[0026] Beneficial effect: The battery box of the embodiment of the present application transfers the heat generated by the single cell during the charging and discharging process to the box body through the heat dissipation ribs, and uses the heat exchange between the box body and the outside air to take away the heat, thereby cooling the single cell, reducing the occurrence of continuous accumulation of heat generated by the single cell around it, and thus maintaining the ambient temperature around the single cell within a certain range, reducing the probability of thermal runaway of the single cell; at the same time, because the heat dissipation ribs transfer the heat of the single cell directly to the box body, the heat transfer speed on the single cell is accelerated, which is conducive to enhancing the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A cross-sectional view of a battery box provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of a first plate and ribs provided in an embodiment of the present application;

[0030] Figure 3 A top view of a battery box provided in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of the three-dimensional structure of the heat dissipation rib plate provided in an embodiment of the present application;

[0032] Figure 5 A top view of the heat-conducting layer provided in an embodiment of the present application;

[0033] Figure 6 A schematic diagram of the relative positions of the first baffle and the single battery provided in an embodiment of the present application;

[0034] Figure 7 A schematic diagram of another relative position of the first baffle and the single battery provided in an embodiment of the present application;

[0035] Figure 8 A schematic diagram of a rib plate structure provided in an embodiment of the present application;

[0036] Figure 9 A schematic diagram of another structure of a rib plate provided in an embodiment of the present application;

[0037] Figure numerals: 1, box body; 10, accommodating cavity; 2, single battery; 3, heat dissipation rib; 31, first plate body; 32, second plate body; 33, rib; 34, heat conductive layer; 35, first baffle; 36, second baffle. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of this application.

[0039] In the description of the present application, it should be understood that the terms "height", "thickness", "up", "down", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 application. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly defined. In the description of the present application, "vertical" means completely perpendicular to 90° or almost completely perpendicular, for example, within the angle range of 80° to 100°, it is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel, for example, within the range of 10° of completely parallel, it is considered parallel.

[0040] It should also be noted that in the drawings of the embodiments of the present application, the arrow marked X indicates the first direction X of the battery box, and the arrow marked Y indicates the second direction Y of the battery box. The first direction X and the second direction Y are introduced to more clearly illustrate the structure and relative position relationship of the components in the battery box. In actual applications, the first direction X and the second direction Y may change according to different placement methods of the battery box.

[0041] As a preface to the present invention, when the ambient temperature of the battery increases, the chemical reaction rate within the battery accelerates, resulting in a corresponding increase in the generation of heat and gas. If heat dissipation is insufficient, the battery temperature will continue to rise, potentially leading to thermal runaway.

[0042] Please refer to Figure 1 The present application provides a battery box including a box body 1, a plurality of single cells 2, and a heat dissipation rib 3. The box body 1 has a receiving cavity 10, and the plurality of single cells 2 and the heat dissipation rib 3 are both disposed within the receiving cavity 10. The heat dissipation rib 3 thermally connects the plurality of single cells 2 and the box body 1 to transfer heat generated by the single cells 2 to the box body 1. The heat dissipation connection refers to the connection between the single cells 2 and the box body 1 and the heat dissipation rib 3, respectively. The connection can be direct contact or indirect contact, and can establish a heat conduction path to achieve direct heat transfer through a solid medium.

[0043] The heat generated by the single battery 2 during the charging and discharging process is transferred to the heat dissipation ribs 3, and then transferred to the box body 1 by the heat dissipation ribs 3. The contact surface between the box body 1 and the outside air forms a heat exchange to achieve heat dissipation of the single battery 2, preventing heat accumulation in the box body 1 and causing the internal temperature of the box body 1 to rise, providing a stable and safe working environment for the single battery 2, and reducing the possibility of thermal runaway of the single battery 2.

[0044] Since the single cell 2 is installed in the accommodating cavity 10, part of the single cell 2 itself will be in direct or indirect contact with the inner wall of the box body 1. The heat dissipation ribs 3 increase the contact area between the single cell 2 and the box body 1, thereby increasing the heat transfer rate between the single cell 2 and the box body 1, thereby ensuring the heat dissipation effect of the single cell 2 and reducing the possibility of the internal temperature of the box body 1 rising due to the slow heat transfer rate when the single cell 2 transfers heat through a relatively small contact surface.

[0045] Please combine Figure 1 and Figure 2 In some embodiments, the side with the largest area of ​​the cell 2 is the large surface, and at least one large surface of the cell 2 is connected to the heat dissipation rib 3. In this embodiment, the cell 2 is a prismatic battery, the outer surface of which is composed of multiple rectangular side surfaces. One side corresponds to the bottom of the shell, and the remaining side surfaces are arranged in pairs opposite each other. One pair of side surfaces has the same area and is larger than the remaining side surfaces. This pair of side surfaces corresponds to the large surfaces of the cell 2. The heat dissipation rib 3 is connected to the large surface of the cell 2, increasing the contact area between each heat dissipation rib 3 and the cell 2, which helps accelerate heat transfer from the cell 2.

[0046] Please refer to Figure 2 In some embodiments, the heat dissipation rib plate 3 includes a first plate 31 and ribs 33. The first plate 31 is thermally connected to the plurality of battery cells 2. The ribs 33 are disposed on a side of the first plate 31 away from the battery cells 2 and are thermally connected to the first plate 31 and the inner wall of the housing 1, respectively. The first plate 31 and the plurality of battery cells 2 are bonded together, allowing heat generated by the battery cells 2 to be transferred to the first plate 31. The ribs 33 can be welded to the inner wall of the housing 1, transferring heat from the first plate 31 to the housing 1. Heat is exchanged between the housing 1 and the outside air, acting as a medium for heat transfer between the battery cells 2 and the inner wall of the housing 1.

[0047] Please combine Figure 3 and Figure 4In some embodiments, the heat dissipation ribs 3 further include a second plate 32, which is disposed on the side of the ribs 33 away from the first plate 31. The second plate 32 is thermally connected to the ribs 33 and the inner wall of the housing 1, respectively. The second plate 32 and the ribs 33 can be welded, and the thermal connection between the second plate 32 and the inner wall of the housing 1 can be welded or bolted, so that the second plate 32 abuts the inner wall of the housing 1. Heat generated by the cells 2 is transferred to the first plate 31, which then transfers the heat to the second plate 32 via the ribs 33. The heat is then transferred to the housing 1 by the second plate 32. The first plate 31, ribs 33, and second plate 32 can all be made of materials with high thermal conductivity. All of these materials are solid. The first plate 31 is in direct contact with the cells 2, while the second plate 32 is in direct contact with the inner wall of the housing 1, achieving direct heat transfer. The first plate 31 and the second plate 32 are connected by ribs 33. On the one hand, the heat received by the first plate 31 can be transferred through the ribs 33. On the other hand, the first plate 31 and the second plate 32 can adapt to the distance between the single battery 2 and the inner wall of the box 1 through the distance between each other. Therefore, there is no need to change the size of the box 1. The heat dissipation of the single battery 2 is achieved on the basis of the existing battery box, simplifying the process.

[0048] Please combine Figure 3 、 Figure 8 and Figure 9 In some embodiments, the ribs 33 extend along the second direction Y, so that the ribs 33 are perpendicular to the first plate 31 and the second plate 32 , so that the thermal conductive ribs are stable under stress.

[0049] Alternatively, the ribs 33 are wavy in shape. The wavy ribs 33 have a relatively large deformation margin. When a mutual squeezing force is generated between the first plate 31 and the single battery 2 , the wavy ribs 33 can play a buffering role.

[0050] Alternatively, there are multiple ribs 33, and at least one rib 33 is cross-distributed with its adjacent ribs 33. The cross-distributed ribs 33 can increase the performance of the first plate 31 in resisting lateral forces, so that the first plate 31 and the second plate 32 maintain relative positions.

[0051] Please refer to Figure 3 In some embodiments, the heat dissipation rib plate 3 includes multiple ribs 33, with adjacent ribs 33 spaced apart from each other. Each rib 33 connects the first plate 31 and the second plate 32. The multiple ribs 33 increase the paths for heat transfer from the first plate 31 to the second plate 32, thereby accelerating the heat dissipation of the single battery cells 2. The multiple ribs 33 also increase the connection strength between the first plate 31 and the second plate 32, thereby enhancing the structural stability of the heat dissipation rib plate 3.

[0052] Please refer to Figure 5 In some embodiments, a gap is provided between the first plate 31 and the single cell 2 to allow for a certain amount of clearance when hoisting the single cell 2 into the box 1, facilitating assembly. The heat dissipation rib 3 also includes a heat-conducting layer 34, which is disposed between the first plate 31 and the single cell 2. The first plate 31 is thermally connected to the single cell 2 via the heat-conducting layer 34, meaning that the first plate 31 and the single cell 2 are in indirect contact. Heat generated by the single cell 2 is first transferred to the heat-conducting layer 34, and then transferred to the first plate 31 via the heat-conducting layer 34. The heat-conducting layer 34 can be made of thermal grease, thermal putty, or a thermally conductive silicone pad. The heat-conducting layer 34 ensures a sufficient fit between the first plate 31 and the single cell 2, filling any gaps between the contact surfaces of the first plate 31 and the single cell 2 to improve heat dissipation efficiency.

[0053] Please refer to Figure 5 In some embodiments, multiple single cells 2 are arranged in a row along the first direction X, that is, the sides of each single cell 2 facing the first plate 31 are in the same plane, and the first plate 31 is extended along the first direction X so that the first plate 31 and the sides of each single cell 2 in the same plane are parallel, so that the heat conductive layer 34 can be evenly distributed.

[0054] The heat dissipation rib 3 also includes a first baffle 35 and a second baffle 36 spaced apart in the first direction X. The first baffle 35 and the second baffle 36 are disposed on the side of the first plate 31 proximal to the battery cells 2 and are respectively connected to the first plate 31. The first baffle 35 and the second baffle 36 can be secured to the first plate 31 by welding or integrally formed with the first plate 31 by bending sheet metal. The thermally conductive layer 34 extends along the first direction X and is located between the first baffle 35 and the second baffle 36. In other words, the area formed between the first plate 31 and the battery cells 2 is located between the first baffle 35 and the second baffle 36. When the first thermally conductive adhesive is thermal paste or thermal grease, the first baffle 35 and the second baffle 36 confine the thermal paste or thermal grease between the first plate 31 and the battery cells 2 to minimize spillage.

[0055] Please combine Figure 5 、 Figure 6 and Figure 7In some embodiments, the first baffle 35 and the second baffle 36 are spaced apart from the single cells 2. That is, the spacing between the first baffle 35 and the second baffle 36 is greater than the length of the single cells 2 arranged in a row in the first direction X. During assembly, the thermal ribs are first tightly attached to and secured against the inner wall of the box body 1. The single cells 2 are then hoisted into the box body 1. The reserved dimensional margin between the first baffle 35 and the second baffle 36 allows for smooth placement of the single cells 2. During glue pouring, sealing strips can be used to seal the gaps between the first baffle 35 and the second baffle 36 and the single cells 2 to prevent overflow of the thermal adhesive.

[0056] Alternatively, both the first baffle 35 and the second baffle 36 are connected to the single battery cell 2. In other words, the first baffle 35 and the second baffle 36 can be directly attached to the single battery cell 2, or they can be indirectly attached to the single battery cell 2 via a thermal pad. In this case, the first baffle 35 and the second baffle 36 have a positioning effect on the single battery cell 2, reducing the displacement of the single battery cell 2 in the first direction X.

[0057] Please combine Figure 5 、 Figure 6 and Figure 7 In some embodiments, the first and second baffles 35 and 36 are made of elastic materials, such as plastic or rubber, that allow for significant deformation. When the first and second baffles 35 and 36 are connected to the cells 2, the elastic material allows the cells 2 to be lowered smoothly into the housing 1 even if they interfere with the first and / or second baffles 35 and 36 during the placement process. Furthermore, the elastic properties of the first and second baffles 35 and 36 can be leveraged to ensure a tight fit with the cells 2, reducing any gaps between them and facilitating the glue filling process.

[0058] Please combine Figure 2 、 Figure 3 and Figure 5 In some embodiments, multiple single cells 2 are arranged in a row along a first direction X, and the battery box includes multiple rows of single cells 2. The multiple rows of single cells 2 are arranged along a second direction Y, and two adjacent single cells 2 are connected to each other. The connection method can be direct contact or indirect connection via thermal conductive adhesive. The second direction Y intersects with the first direction X. There are multiple heat dissipation ribs 3. There is at least one heat dissipation rib 3 corresponding to both sides of the multiple rows of single cells 2 along the second direction Y. The heat dissipation ribs 3 are thermally connected to the single cells 2 and the inner wall of the box body 1 respectively.

[0059] Multiple rows of single cells 2 increase the battery capacity of the battery box, and multiple heat dissipation ribs 3 accelerate the dissipation of heat generated by the single cells 2. Each row of single cells 2 is clamped by the heat dissipation ribs 3 on both sides, which suppresses the expansion of the single cells 2 and increases the safety of the use of the single cells 2.

[0060] The above is a detailed introduction to the battery box provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery box, characterized in that: include: A box body (1) having a receiving cavity (10); A plurality of single cells (2) are arranged in the accommodating cavity (10), and the plurality of single cells (2) are arranged in a row along a first direction; A heat dissipation rib (3) is arranged in the accommodating cavity (10), with at least one heat dissipation rib (3) corresponding to each side of the single battery (2). The heat dissipation rib (3) thermally connects a plurality of the single batteries (2) and the box (1) to transfer heat generated by the single batteries (2) to the box (1).

2. The battery box according to claim 1, characterized in that: The heat dissipation rib plate (3) comprises: A first plate (31) is thermally connected to the plurality of single cells (2); The ribs (33) are arranged on a side of the first plate (31) away from the single battery (2) and are respectively connected to the first plate (31) and the inner wall of the box (1) in a heat-conductive manner.

3. The battery box according to claim 2, characterized in that: The heat dissipation rib plate (3) further comprises: The second plate (32) is arranged on a side of the rib (33) away from the first plate (31), and the second plate (32) is thermally connected to the rib (33) and the inner wall of the box (1) respectively.

4. The battery box according to claim 3, characterized in that: The heat dissipation rib plate (3) comprises a plurality of ribs (33), two adjacent ribs (33) are spaced apart from each other, and each rib (33) is connected to the second plate body (32).

5. The battery box according to claim 3, characterized in that: The first plate (31) and the single battery (2) are spaced apart, the heat dissipation rib plate (3) further comprises a heat-conducting layer (34), the heat-conducting layer (34) is arranged between the first plate (31) and the single battery (2), and the first plate (31) is heat-conductingly connected to the single battery (2) via the heat-conducting layer (34).

6. The battery box according to claim 5, characterized in that: The first plate (31) is extended along the first direction; The heat dissipation rib plate (3) further comprises a first baffle (35) and a second baffle (36) arranged at intervals in the first direction, the first baffle (35) and the second baffle (36) being arranged on a side of the first plate body (31) close to the single battery (2) and respectively connected to the first plate body (31); The heat-conducting layer (34) extends along the first direction and is located between the first baffle (35) and the second baffle (36).

7. The battery box according to claim 6, characterized in that: The first baffle (35) and the second baffle (36) are both spaced apart from the single battery (2); Alternatively, the first baffle (35) and the second baffle (36) are both connected to the single battery (2).

8. The battery box according to claim 7, characterized in that: The material of the first baffle (35) and the second baffle (36) is elastic.

9. The battery box according to claim 1, characterized in that: The battery box comprises a plurality of rows of single cells (2), the rows of single cells (2) being arranged along a second direction and connected to each other, the second direction intersecting the first direction, a plurality of heat dissipation ribs (3) being provided, at least one heat dissipation rib (3) corresponding to each of the two sides of the rows of single cells (2) along the second direction, and the heat dissipation ribs (3) being respectively connected to the single cells (2) and the inner wall of the box body (1) in a heat-conductive manner.

10. The battery box according to claim 3, characterized in that: The ribs (33) extend along a second direction; Alternatively, the ribs (33) are wavy; Alternatively, the number of the ribs (33) is multiple, and at least one of the ribs (33) is arranged to cross with its adjacent ribs (33).

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