Battery pack box body and battery pack

Abstract

The utility model discloses a battery pack box body and belongs to the technical field of battery packs. Comprising a bottom plate; the sealing ring is placed on the bottom plate; the front end plate, the rear end plate, the left side plate and the right side plate are fixed on the bottom plate through fasteners to form the box body in a surrounding mode, the end plates and the side plates tightly press the sealing rings, and the connecting faces of the end plates and the side plates are filled with sealing gaskets. The battery pack box body only needs to be assembled by bolts, so that the production process is simple, the production input cost is reduced, and the air tightness of the box body is also ensured. The utility model also provides a battery pack which is provided with a battery pack box body and also comprises a battery module arranged in the box body; the limiting plates are arranged at the two ends of the battery module and located between the cross beam and the battery module, and limiting boss frames protruding outwards are arranged on the end faces, facing the battery module, of the limiting plates; the foam is attached to the interior of the limiting boss frame; and the upper cover covers the box body and is sealed. The number of the foams is reduced, it is guaranteed that the foams can be attached to the middle position without inclining, and the assembling efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packs, and particularly relates to a battery pack box and a battery pack. Background Art

[0002] The function of the battery pack box is to place batteries and other components, while protecting all components. Therefore, the design of the box must have sufficient strength and ensure sealing to prevent water and air from entering.

[0003] To ensure sufficient structural strength, existing battery packs often feature side panels as reinforcement. The side panels are typically welded to the bottom panel, but this requires specialized welding equipment and tooling, resulting in significant production investment and the risk of weld failure, which can lead to airtightness failures. Utility Model Content

[0004] The utility model aims to solve the above problems in the prior art and proposes a battery pack box and a battery pack which can realize box assembly without welding and ensure the sealing of the box.

[0005] The utility model can be realized by the following technical solutions:

[0006] A battery pack box, comprising:

[0007] base plate;

[0008] A sealing ring is arranged in a rectangular structure and is placed along the four sides of the bottom plate;

[0009] The front and rear end plates and the left and right side plates are placed along the four sides of the bottom plate respectively. The end plates and the side plates are fixed to the bottom plate by fasteners and enclosed to form a box body. At the same time, the end plates and the side plates press the sealing ring tightly.

[0010] A plug-in fitting structure is formed between the end plate and the side plate, and a sealing gasket is filled on the connecting surface of the plug-in fitting structure.

[0011] As a further improvement of the present invention, a slot is provided near the end of the side panel, the sealing gasket is arranged in the slot, the end of the end panel is inserted into the slot and the sealing gasket is pressed, and then the end panel is connected and fixed to the side panel by fasteners. At this time, the end panel and the side panel constitute the plug-in fitting structure.

[0012] As a further improvement of the present invention, the side panel is arranged in an L-shaped structure and includes a vertical side panel portion and a horizontal side panel portion, the slot is vertically opened in the vertical side panel portion, and the slot and the horizontal side panel portion are respectively located on the front and back sides of the vertical side panel portion.

[0013] As a further improvement of the present invention, the bottom surface of the vertical portion of the side panel extends downward to form an abutment surface. At this time, the bottom surface height of the horizontal portion of the side panel is higher than the height of the abutment surface and forms a first avoidance gap.

[0014] As a further improvement of the present invention, the bottom surface heights on both sides of the vertical portion of the side panel are higher than the height of the abutting surface and form a second avoidance gap, and the second avoidance gap is located at both ends of the first avoidance gap and the two are connected.

[0015] As a further improvement of the present invention, the end plate is arranged in an L-shaped structure and includes an end plate vertical portion and an end plate horizontal portion, a third avoidance gap is left between the bottom surface of the end plate horizontal portion and the end plate vertical portion, and a fourth avoidance gap is left between the two ends of the end plate horizontal portion and the end plate vertical portion.

[0016] As a further improvement of the present invention, when the side plates and the end plates are mounted on the bottom plate, the first avoidance gap, the second avoidance gap, and the third avoidance gap together form an accommodation space for placing the sealing ring;

[0017] The fourth avoidance gap is used for allowing both sides of the end plate to be inserted along the slot.

[0018] As a further improvement of the present invention, the outer surfaces of the side panels and the end panels are bonded with insulation panels, which are embedded in grooves formed between the vertical portions of the side panels and the horizontal portions of the side panels and between the vertical portions of the end panels and the horizontal portions of the end panels.

[0019] As a further improvement of the present invention, it also includes a crossbeam arranged in the box body, a leaf spring is installed on a side of the crossbeam close to the end plate, the leaf spring is connected to the end plate, a pin is provided on the crossbeam and a limit plate is provided at the outer end of the pin, waist holes are provided at both ends of the leaf spring, the pin is passed through the waist hole and the diameter of the limit plate is larger than the waist hole.

[0020] A battery pack is also provided, which has the above-mentioned battery pack case and further includes:

[0021] A battery module is placed in the box;

[0022] Limiting plates, which are arranged at both ends of the battery module and located between the crossbeam and the battery module, and the end surface of the limiting plate facing the battery module is provided with an outwardly protruding limiting boss frame;

[0023] Foam, which is attached to the limiting boss frame, and the limiting plate presses the foam tightly against the end surface of the battery module;

[0024] The upper cover is closed on the box body and sealed.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The battery pack box is a detachable structure that does not require special welding equipment and welding tooling. It only needs bolt assembly, which simplifies the production process and reduces production input costs. In addition, the joints between the side panels, end panels and bottom panels are sealed with sealing rings, and the joints between the end panels and side panels are sealed with sealing gaskets, thereby ensuring the sealing performance of the box.

[0027] 2. Insulation plates are attached to the outer surfaces of the side panels and end panels. The insulation plates are embedded in the grooves formed between the vertical and horizontal parts of the side panels and between the vertical and horizontal parts of the end panels, ensuring that the insulation plates do not protrude outward and do not occupy excess space. The addition of insulation plates ensures that the battery pack body can not only ensure good thermal conductivity at high temperatures, but also prevent the battery temperature from dropping too quickly at low temperatures.

[0028] 3. A movable crossbeam structure is used. When the battery cells are stacked in the box, the leaf spring is in an intermediate compressed state to provide the battery pack with the best preload force. After the battery pack has been working for a period of time and the expansion force changes, the pressure plate can be pushed to continue compressing the leaf spring, or the leaf spring rebounds to push the pressure plate to press the battery pack. The automatic adjustment at any time greatly improves the life and safety of the battery pack.

[0029] 4. A foam pad is set at the front and rear ends of the battery module. This avoids placing a piece of foam pad between every two battery cells, greatly reducing the number of foam pads. It only requires increasing the thickness of the two foam pads at the front and rear ends of the battery module. The setting of the limiting boss frame ensures that the foam pad can be smoothly attached to the middle position without being skewed, thereby improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is an exploded schematic diagram of the battery pack box of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the battery pack box of the present utility model;

[0032] Figure 3 It is a top view of the battery pack box of the present utility model;

[0033] Figure 4 This utility model Figure 3 A partial enlarged view of point A in the middle;

[0034] Figure 5 It is a structural schematic diagram of the bottom plate of the utility model;

[0035] Figure 6 It is a structural schematic diagram of the side panel of the utility model;

[0036] Figure 7 It is a structural diagram of the end plate of the utility model;

[0037] Figure 8 This is a structural diagram of the battery pack box of the present invention after the crossbeam is installed;

[0038] Figure 9 It is a structural schematic diagram of the crossbeam of the present utility model;

[0039] Figure 10 It is a structural diagram of the leaf spring of the utility model;

[0040] Figure 11 This is a schematic diagram of an explosion of the battery pack of the present invention;

[0041] Figure 12 This is an exploded schematic diagram of the battery module, foam, and limit plate of the utility model;

[0042] Figure 13 It is a structural schematic diagram of the battery pack of the present utility model.

[0043] In the figure, 100, bottom plate; 110, water pipe joint;

[0044] 200, sealing ring;

[0045] 300, end plate; 310, end plate vertical portion; 320, end plate horizontal portion; 330, third avoidance gap; 340, fourth avoidance gap;

[0046] 400, side panel; 410, slot; 420, fastener; 430, side panel vertical portion; 431, abutment surface; 440, side panel horizontal portion; 450, first avoidance notch; 460, second avoidance notch;

[0047] 500, sealing gasket;

[0048] 600, insulation board;

[0049] 700, crossbeam; 701, pin; 702, limit plate; 710, leaf spring; 711, waist hole;

[0050] 800, battery module; 810, limiting plate; 811, limiting boss frame; 820, foam;

[0051] 900. Top cover. DETAILED DESCRIPTION

[0052] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical method of the present invention, but the present invention is not limited to these embodiments.

[0053] like Figure 1-13As shown, the utility model provides a battery pack box, comprising:

[0054] The bottom plate 100 is integrated with a liquid cooling channel and has a water pipe joint 110 for the inlet and outlet of the cooling liquid;

[0055] The sealing ring 200 is arranged in a rectangular structure and is placed along the four sides of the bottom plate 100;

[0056] The front and rear end plates 300 and the left and right side plates 400 are placed along the four sides of the bottom plate 100 respectively. The end plates 300 and the side plates 400 are fixed to the bottom plate 100 by fasteners 420 and enclosed to form a box body. At the same time, the end plates 300 and the side plates 400 press the sealing ring 200 tightly.

[0057] The end of the end plate 300 and the end of the side plate 400 form a plug-in fitting structure, and the connecting surface of the plug-in fitting structure is filled with a sealing gasket 500 .

[0058] Compared with the battery pack case formed by welding, the battery pack case provided in this embodiment is a detachable structure, which does not require special welding equipment and welding tooling, but only requires bolt assembly. The production process is simple, which reduces the production input cost. In addition, the connection between the side plate 400, the end plate 300 and the bottom plate 100 is sealed by the sealing ring 200, and the connection between the end plate 300 and the side plate 400 is sealed by the sealing gasket 500, thereby ensuring the sealing performance of the case.

[0059] That is, the structural design of the battery pack box not only simplifies the production process and reduces production costs, but also improves the air tightness of the box.

[0060] Preferably, a slot 410 is provided near the end of the side panel 400, and a sealing gasket 500 is arranged in the slot 410. The end of the end panel 300 is inserted into the slot 410 and the sealing gasket 500 is pressed tightly, and then the end panel 300 and the side panel 400 are connected and fixed by fasteners 420. At this time, the end panel 300 and the side panel 400 constitute the above-mentioned plug-in matching structure, and ensure the sealing performance of the connection between the end panel 300 and the side panel 400.

[0061] Preferably, the side panel 400 is arranged in an L-shaped structure and includes a side panel vertical portion 430 and a side panel horizontal portion 440. The slot 410 is vertically opened in the side panel vertical portion 430, and the slot 410 and the side panel horizontal portion 440 are respectively located on the front and back sides of the side panel vertical portion 430.

[0062] Specifically, the bottom surface of the side panel vertical portion 430 extends downward to form an abutment surface 431. At this time, the bottom surface of the side panel horizontal portion 440 is higher than the height of the abutment surface 431 and forms a first avoidance gap 450. It should be noted that when the side panel 400 is installed on the bottom plate 100, the abutment surface 431 abuts the bottom plate 100, and the provision of the first avoidance gap 450 leaves space between the side panel horizontal portion 440 and the bottom plate 100 for accommodating the sealing ring 200.

[0063] Furthermore, the bottom heights on both sides of the side panel vertical portion 430 are higher than the height of the abutting surface 431 and form a second avoidance gap 460. The second avoidance gap 460 is located at both ends of the first avoidance gap 450 and the two are connected. Similarly, the setting of the second avoidance gap 460 reserves space at the corner position of the sealing ring 200.

[0064] That is, when the side plate 400 presses the sealing ring 200 onto the bottom plate 100 , the left and right side edges and the corners of the side edges of the sealing ring 200 are exactly located in the first avoidance gap 450 and the second avoidance gap 460 .

[0065] Preferably, the end plate 300 is arranged in an L-shaped structure and includes an end plate vertical portion 310 and an end plate horizontal portion 320. A third avoidance gap 330 is left between the bottom surface of the end plate horizontal portion 320 and the end plate vertical portion 310, and a fourth avoidance gap 340 is left between the two ends of the end plate horizontal portion 320 and the end plate vertical portion 310.

[0066] The fourth avoidance gap 340 is used for inserting two sides of the end plate 300 along the slot 410 , while the third avoidance gap 330 reserves space for the front and rear sides of the sealing ring 200 .

[0067] In summary, when the end plate 300 and the side plate 400 are installed in place, the first avoidance gap 450, the second avoidance gap 460, and the third avoidance gap 330 are combined to form a rectangular space for accommodating the sealing ring 200, and then the sealing ring 200 is pressed against the bottom plate 100 through the end plate cross section 320 and the side plate cross section 440, thereby ensuring the sealing performance of the connection between the side plate 400, the end plate 300 and the bottom plate 100.

[0068] Preferably, the outer surfaces of the side panel 400 and the end panel 300 are adhered with an insulation panel 600, and the insulation panel 600 is embedded in the groove formed between the side panel vertical portion 430, the side panel horizontal portion 440 and between the end panel vertical portion 310, the end panel horizontal portion 320, to ensure that the insulation panel 600 does not protrude outward and does not occupy excess space.

[0069] It's important to note that batteries operate on a chemical reaction, and therefore, the rate of these reactions changes with temperature. Extremely high temperatures can accelerate these reactions, generating excessive heat inside the battery and potentially causing leaks, explosions, and other accidents. Extremely low temperatures can slow down these reactions, reducing the amount of energy the battery can output during discharge, causing a drop in voltage and even damage. Therefore, maintaining an appropriate battery temperature range can maximize battery life.

[0070] The heat from the batteries is typically removed through a liquid cooling plate within the battery pack. Existing bottom liquid cooling plates are typically integrated into the battery pack enclosure. Battery pack enclosures are typically made of aluminum extrusions. Aluminum has high thermal conductivity and excellent thermal conductivity at high temperatures, but it cannot effectively insulate heat at low temperatures, affecting the low-temperature safety of the battery pack.

[0071] In this embodiment, by adding the insulation plate 600, the battery pack body can ensure good thermal conductivity at high temperatures and prevent the battery temperature from dropping too quickly at low temperatures.

[0072] In addition, the insulation board 600 can be made of non-metallic materials such as plastic and foam insulation materials, and has properties such as low thermal conductivity, insulation, and flame retardancy; the connection method of the insulation board 600 can be a fixed connection such as gluing, or a detachable connection such as bolts and snaps.

[0073] Preferably, the box body further includes a crossbeam 700, a leaf spring 710 is installed on a side of the crossbeam 700 close to the end plate 300, and the leaf spring 710 and the end plate 300 can be fixedly connected by welding, bolts, etc. A pin 701 is provided on the crossbeam 700, and a limit plate 702 is provided at the outer end of the pin 701. Waist holes 711 are provided at both ends of the leaf spring 710, and the pin 701 is passed through the waist hole 711, and the diameter of the limit plate 702 is larger than the waist hole 711.

[0074] Specifically, after the leaf spring 710 is compressed, its two ends become wider, and the waist hole 711 moves relative to the pin 701, while the setting of the limit plate 702 ensures that the leaf spring 710 does not fall off. In this way, the leaf spring 710 can be stably compressed and rebounded to achieve the forward and backward movement of the beam 700.

[0075] It's important to note that existing battery packs have welded horizontal and vertical beams, which means they're fixed and cannot be moved. Furthermore, the cells in the battery pack expand during charging and discharging, so during assembly, the crossbars 700 are often used to limit the cells and apply a preload to offset this expansion. However, as the battery pack ages, this expansion force changes, while the preload applied by the fixed crossbars 700 remains unchanged, potentially impacting the battery pack's lifespan and safety.

[0076] To solve this problem, this embodiment adopts a movable crossbeam 700 structure. When the battery cells are stacked in the box, the leaf spring 710 is in an intermediate compression state to provide the battery cell group with the best pre-tightening force; after the battery pack has been working for a period of time and the expansion force changes, it can also push the pressure plate to move and continue to compress the leaf spring 710, or the leaf spring 710 rebounds to push the pressure plate to press the battery cell group, and automatically adjust at any time, greatly improving the life and safety of the battery pack.

[0077] The present invention also provides a battery pack having the above-mentioned battery pack box, and further comprising:

[0078] The battery module 800 is placed in the box;

[0079] The limiting plates 810 are provided at both ends of the battery module 800 and between the crossbeam 700 and the battery module 800. The end surface of the limiting plate 810 facing the battery module 800 is provided with an outwardly protruding limiting boss frame 811;

[0080] The foam 820 is attached to the inner surface of the limiting boss frame 811 , and the limiting plate 810 presses the foam 820 against the end surface of the battery module 800 ;

[0081] The upper cover 900 is closed on the box body and sealed.

[0082] It should be noted here that the battery pack is often disturbed by external vibrations during operation, and the internal battery cells will expand during the charging and discharging process. In order to protect the battery cells in the battery pack, buffer parts are often placed in the battery pack to reduce damage to the battery cells. The existing battery pack buffer parts commonly used are foam 820. Usually, a piece of foam 820 is placed between two battery cells. The number of foam 820 is too large, and the battery cells and foam 820 are easily skewed when pasted, resulting in cumbersome assembly and low production efficiency.

[0083] In this regard, in this embodiment, only one foam 820 is set at the front and rear ends of the battery module 800. This avoids placing a piece of foam 820 between every two battery cells, greatly reducing the number of foams 820. It is only necessary to increase the thickness of the two foams 820 at the front and rear ends of the battery module 800.

[0084] In addition, the provision of the limiting boss frame 811 ensures that the foam 820 can be smoothly attached to the middle position without being skewed, thereby improving assembly efficiency.

[0085] The technical means disclosed in the present invention are not limited to those disclosed in the above technical means, but also include technical solutions composed of any combination of the above technical features. The above is a specific embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

[0086] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0087] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0088] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0089] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

Claims

1. A battery pack box, characterized in that: include: base plate; A sealing ring is arranged in a rectangular structure and is placed along the four sides of the bottom plate; The front and rear end plates and the left and right side plates are placed along the four sides of the bottom plate respectively. The end plates and the side plates are fixed to the bottom plate by fasteners and enclosed to form a box body. At the same time, the end plates and the side plates press the sealing ring tightly. A plug-in fitting structure is formed between the end plate and the side plate, and a sealing gasket is filled on the connecting surface of the plug-in fitting structure.

2. The battery pack box according to claim 1, characterized in that: The side panel is provided with a slot near the end portion, the sealing gasket is arranged in the slot, the end portion of the end panel is inserted into the slot and the sealing gasket is pressed tightly, and then the end panel is connected and fixed to the side panel by fasteners. At this time, the end panel and the side panel constitute the plug-in fitting structure.

3. The battery pack box according to claim 2, characterized in that: The side panel is arranged in an L-shaped structure and includes a side panel vertical portion and a side panel horizontal portion. The slot is vertically opened in the side panel vertical portion, and the slot and the side panel horizontal portion are respectively located on the front and back sides of the side panel vertical portion.

4. The battery pack box according to claim 3, characterized in that: The bottom surface of the vertical portion of the side plate extends downward to form an abutment surface. At this time, the bottom surface of the horizontal portion of the side plate is higher than the height of the abutment surface to form a first avoidance gap.

5. The battery pack case according to claim 4, characterized in that: The bottom surfaces on both sides of the vertical portion of the side plate are higher than the height of the abutting surface and form a second avoidance gap. The second avoidance gap is located at both ends of the first avoidance gap and the two are connected.

6. The battery pack case according to claim 5, characterized in that: The end plate is arranged in an L-shaped structure and includes an end plate vertical portion and an end plate horizontal portion. A third avoidance gap is left between the bottom surface of the end plate horizontal portion and the end plate vertical portion, and a fourth avoidance gap is left between the two ends of the end plate horizontal portion and the end plate vertical portion.

7. The battery pack case according to claim 6, characterized in that: When the side plate and the end plate are mounted on the bottom plate, the first avoidance gap, the second avoidance gap, and the third avoidance gap together form an accommodation space for the sealing ring; The fourth avoidance gap is used for allowing both sides of the end plate to be inserted along the slot.

8. The battery pack box according to claim 1, characterized in that: The outer surfaces of the side plates and the end plates are attached with heat-insulating plates, which are embedded in grooves formed between the vertical portions of the side plates and the horizontal portions of the side plates and between the vertical portions of the end plates and the horizontal portions of the end plates.

9. The battery pack case according to claim 1, characterized in that: It also includes a crossbeam arranged in the box body, a leaf spring is installed on a side of the crossbeam close to the end plate, the leaf spring is connected to the end plate, a pin is provided on the crossbeam and a limit plate is provided at the outer end of the pin, waist holes are provided at both ends of the leaf spring, the pin is passed through the waist hole and the diameter of the limit plate is larger than the waist hole.

10. A battery pack having a battery pack case as claimed in any one of claims 1 to 9, characterized in that: Also includes: A battery module is placed in the box; Limiting plates, which are arranged at both ends of the battery module and located between the crossbeam and the battery module, and the end surface of the limiting plate facing the battery module is provided with an outwardly protruding limiting boss frame; Foam, which is attached to the limiting boss frame, and the limiting plate presses the foam tightly against the end surface of the battery module; The upper cover is closed on the box body and sealed.

Images