Battery box and battery pack

Abstract

The utility model provides a battery box and a battery pack, the battery box comprises a box body and partition plates, the box body is provided with a containing cavity, the partition plates are arranged in the containing cavity, the containing cavity is divided into a plurality of mounting grooves which are arranged in one-to-one correspondence with battery cells by the partition plates, the peripheral surfaces of the battery cells are attached to the inner wall surfaces of the mounting grooves, and the battery cells are supported on the bottom surface of the box body. The box body and the partition plate are provided with liquid cooling flow channels which are communicated with each other; and the liquid cooling flow channels cover the peripheral surfaces and the bottom surfaces of the battery cells. According to the battery box disclosed by the invention, the partition plates are adopted, and the communicated liquid cooling runners are arranged in the box body, so that all-directional liquid cooling of the battery cell is realized, namely five-surface heat dissipation of the battery cell is realized, the cooling efficiency is improved, the cooling structure is simplified, the temperature of the battery cell is effectively controlled, the service life of the battery cell is prolonged, and the use stability of the battery cell is improved; therefore, the problems of complex structure, poor heat dissipation efficiency and non-uniform heat dissipation of the battery pack in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery box and a battery pack. BACKGROUND

[0002] With the continuous development of battery technology, the requirements for battery packs are also increasing, among which the thermal management performance of the battery pack affects the service life and stability of the battery.

[0003] At present, the heat dissipation methods of battery packs mainly include air cooling and liquid cooling. The air cooling system introduces air into the interior of the battery pack through a fan or a blower, and removes the heat generated by the battery through thermal convection. However, due to the low thermal conductivity of air, the heat dissipation effect is limited, and under high-power charging and discharging conditions, the air cooling system often fails to meet the heat dissipation requirements. In addition, the air cooling system may reduce the heat dissipation efficiency and increase the maintenance cost due to dust accumulation in long-term use.

[0004] The liquid cooling system utilizes the high thermal conductivity and large heat capacity of the cooling liquid to exchange heat with the battery through liquid cooling plates and other devices, and the heat dissipation effect is obviously better than that of the air cooling system. However, in the traditional design of the liquid cooling system, the cold plate is usually used as an independent heat dissipation component and needs to be connected with the cooling liquid circulation system through a pipeline. This design not only increases the complexity of the system, occupies valuable space inside the battery box and reduces the energy density of the battery pack, but also increases the risk of cooling liquid leakage at the pipeline connection, which poses a potential threat to the safety of the battery.

[0005] As can be seen from the above, the current battery pack has the problems of complex structure, poor heat dissipation efficiency and uneven heat dissipation. CONTENT OF THE INVENTION

[0006] The main purpose of the present application is to provide a battery box and a battery pack to solve the problems of complex structure, poor heat dissipation efficiency and uneven heat dissipation of the battery pack in the prior art.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a battery box is provided, which comprises a box body and a partition plate. The box body has a receiving cavity, and the partition plate is arranged inside the receiving cavity. The partition plate divides the receiving cavity into a plurality of installation grooves corresponding to the battery cells one by one. The outer peripheral surface of each battery cell is attached to the inner wall surface of the installation groove, and the battery cell is supported on the bottom surface of the box body. The box body and the partition plate have a liquid cooling flow channel arranged in communication. The liquid cooling flow channel covers the outer peripheral surface and the bottom surface of the battery cell.

[0008] Further, a phase change material layer is arranged on the inner wall surface and the bottom surface of the installation groove, and the phase change material layer is attached to the battery cell.

[0009] Further, the box body comprises a bottom plate and a side plate, the bottom plate specifically a bottom flow channel, the bottom of the partition plate is arranged on the bottom plate, the side plate is arranged on the bottom plate, the bottom plate and the side plate enclose a containing cavity, the side plate has a side flow channel, and the end of the partition plate in the extension direction is connected with the side plate, and the liquid cooling flow channel in the partition plate communicates with the bottom flow channel and / or the side flow channel.

[0010] Further, the bottom plate, the partition plate and the side plate are all hollow structures.

[0011] Further, the side plate comprises a plurality of plate segments arranged in sequence along the circumference of the box body, the side flow channels in the plurality of plate segments are independently arranged, and the side flow channel in each plate segment communicates with the bottom flow channel.

[0012] Further, the side plate comprises a plurality of plate segments arranged in sequence along the circumference of the box body, the side flow channels in the plurality of plate segments communicate.

[0013] Further, the battery box further comprises a plurality of baffles arranged in the side flow channel, the plurality of baffles are arranged in the height direction of the box body, the baffles separate the side flow channel into a plurality of sub-flow channels arranged in the height direction of the box body, the baffles are provided with through holes communicating with the sub-flow channels, and the sub-flow channel close to the bottom plate in the plurality of sub-flow channels communicates with the bottom flow channel.

[0014] Further, the partition plate comprises a plurality of first plate segments, the first plate segments extend in the length direction of the box body, and the plurality of first plate segments are arranged in the width direction of the box body; and / or a plurality of second plate segments, the second plate segments extend in the width direction of the box body, and the plurality of second plate segments are arranged in the length direction of the box body.

[0015] Further, when the partition plate comprises the first plate segments and the second plate segments arranged in cross, the liquid cooling flow channels in the first plate segments and the second plate segments communicate.

[0016] Further, the battery box further comprises a water inlet nozzle and a water outlet nozzle, the water inlet nozzle is arranged on the side wall of the box body, the water inlet nozzle communicates with the liquid cooling flow channel and is used for supplying liquid, and the water outlet nozzle is arranged on the side wall of the box body, the water outlet nozzle communicates with the liquid cooling flow channel and is used for discharging liquid.

[0017] According to another aspect of the utility model, a kind of battery pack is provided, and the battery pack includes above-mentioned battery box.

[0018] The technical scheme of the utility model, the battery box of the present application is arranged with the liquid cooling flow channel communicating in the partition plate and the box body, the full range liquid cooling of battery cell is realized, i.e. five surface heat dissipation of battery cell is realized, cooling efficiency is improved, cooling structure is simplified, temperature of battery cell is effectively controlled, and service life and stability of use of battery cell are prolonged.

[0019] The application adopts the partition plate to correspondingly arrange the battery cell in the mounting groove, realizes independent installation of the battery cell, avoids mutual interference phenomenon between the battery cells, simultaneously utilizes the partition plate to separate into the mounting groove, further guarantees that the liquid cooling flow channel is wrapped outside the battery cell to perform omnidirectional heat dissipation, guarantees stability and safety of the battery cell, and further improves overall performance of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application, serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 A perspective structural schematic view of a battery pack of the present application is shown;

[0022] Figure 2 A perspective structural schematic view of a battery box of the present application is shown;

[0023] Figure 3 An enlarged view of A in Figure 2 is shown;

[0024] Figure 4 A top view of the battery box of the present application is shown;

[0025] Figure 5 A B-B cross-sectional view of Figure 4 is shown;

[0026] Figure 6 An enlarged view of C in Figure 5 is shown.

[0027] Among them, the above-mentioned drawings include the following reference signs:

[0028] 10, box body; 110, bottom plate; 120, side plate; 130, mounting groove; 20, partition plate; 210, first plate segment; 220, second plate segment; 30, phase change material layer. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0031] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0032] To address the problems of complex structure, poor heat dissipation efficiency, and uneven heat dissipation in existing battery packs, this application provides a battery pack comprising a battery box and multiple battery cells disposed inside the battery box.

[0033] This application improves the structure of the battery box to simplify the liquid cooling structure and enhance the heat dissipation efficiency and uniformity of the battery cells.

[0034] The battery box and battery cells provided in this embodiment are both cubic structures.

[0035] like Figures 1 to 6 As shown, the battery box includes a box body 10 and a partition 20. The box body 10 has a receiving cavity, and the partition 20 is disposed inside the receiving cavity. The partition 20 divides the receiving cavity into multiple mounting slots 130 that correspond one-to-one with the battery cells. The outer peripheral surface of each battery cell is in contact with the inner wall surface of the mounting slot 130. The battery cells are supported on the bottom surface of the box body 10. The box body 10 and the partition 20 have a liquid cooling channel that is connected to each other. The liquid cooling channel covers the outer peripheral surface and the bottom surface of the battery cells.

[0036] The partition 20 divides the accommodating cavity to create mounting slots 130 for one-to-one installation of battery cells, thereby ensuring sufficient heat dissipation for each battery cell. The battery cells are placed inside the mounting slots 130 and supported on the bottom surface of the battery box to achieve stable installation of the battery cells.

[0037] Specifically, the battery box of this application adopts a liquid cooling channel that is connected inside the partition 20 and the box body 10, which realizes all-round liquid cooling of the battery cell, that is, five-sided heat dissipation of the battery cell, improves cooling efficiency, effectively controls the temperature of the battery cell, and extends the service life and stability of the battery cell.

[0038] like Figure 2 As shown, the length direction of the box 10 is the X direction, the width direction of the box 10 is the Y direction, and the height direction of the box 10 is the Z direction.

[0039] The structural design adopted in this application eliminates the aerogel placement between battery cells in the prior art. The structural design of this application also eliminates the need for indirect heat dissipation by setting a cold plate structure inside the housing 10. The structural design of this application simplifies the heat dissipation structure and improves the heat dissipation efficiency of the battery cells.

[0040] In the embodiment, the partition plate 20 separates the accommodation cavity, and the partition plate 20 is used to correspondingly arrange the battery cell in the mounting groove 130, so that the independent installation of the battery cell is realized, the mutual interference phenomenon between the battery cells is avoided, the mounting groove 130 is separated by the partition plate 20, and the liquid cooling flow channel is further wrapped outside the battery cell for omnidirectional heat dissipation, so that the stability and safety of the battery cell are ensured, and the overall performance of the battery pack is further improved.

[0041] As shown in Figure 3 , Figure 5 and Figure 6 , the phase change material layer 30 is arranged on the groove inner wall surface and groove bottom surface of the mounting groove 130, and the phase change material layer 30 is attached to the battery cell.

[0042] Specifically, the phase change material layer 30 is arranged on the inner wall surface and bottom surface of the mounting groove 130, the phase change material layer 30 has the advantages of high thermal conductivity and strong heat absorption capacity, the arrangement of the phase change material layer 30 can achieve the effects of insulation and heat insulation, and the stability of the battery cell in use is ensured.

[0043] The density of the phase change material can be adaptively set as required to ensure that the phase change material layer 30 can achieve good insulation and heat absorption effects without affecting the overall volume and weight of the battery pack. It can be understood that the phase change material is a phase change material available on the market.

[0044] In the embodiment, the groove bottom surface of the mounting groove 130 is the bottom surface of the box body 10, and the phase change material layer 30 is arranged on the bottom surface of the box body 10 corresponding to the mounting groove 130, so that the phase change material layer 30 is attached to the five surfaces of the battery cell to achieve the insulation installation of the battery cell and good heat conduction.

[0045] As shown in Figures 1 to 4 , the box body 10 includes a bottom plate 110 and a side plate 120, the bottom plate 110 specifically includes a bottom flow channel, the bottom part of the partition plate 20 is arranged on the bottom plate 110, the side plate 120 is arranged on the bottom plate 110, the bottom plate 110 and the side plate 120 enclose an accommodation cavity, the side plate 120 has a side flow channel, and the end part of the partition plate 20 in the extension direction is connected with the side plate 120.

[0046] The partition plate 20 is arranged on the bottom plate 110 and connected with the side plate 120 to form the structure of the mounting groove 130, so that the battery cell arranged in the inside of the mounting groove 130 can be attached to the side plate 120 and the partition plate 20.

[0047] The liquid cooling flow channel in the partition plate 20 is in communication with the bottom flow channel, and specifically, the liquid coolant in the liquid cooling flow channel flows between the inside of the partition plate 20 and the bottom flow channel, so that the liquid coolant in the inside of the bottom plate 110 of the box body 10 flows into the inside of the partition plate 20.

[0048] The liquid cooling flow channel inside the partition plate 20 is in communication with the side flow channel, specifically, the liquid coolant inside the liquid cooling flow channel flows between the inside of the partition plate 20 and the side flow channel, so as to realize the liquid coolant inside the side plate 120 of the box 10 flowing into the inside of the partition plate 20.

[0049] Of course, the inside of the partition plate 20 can also be in communication with the bottom flow channel and the side flow channel at the same time, so as to realize the liquid coolant flowing into the inside of the partition plate 20 from the bottom flow channel and the side flow channel at the same time.

[0050] In an embodiment, the bottom plate 110, the partition plate 20 and the side plate 120 are all hollow structures, and the plurality of hollow structures are in communication to form the liquid cooling flow channel.

[0051] The hollow structure is adopted to realize that the bottom plate 110, the partition plate 20 and the side plate 120 have larger cooling areas, which is beneficial to improve the heat dissipation efficiency.

[0052] In another embodiment, the side plate 120 includes a plurality of plate segments sequentially arranged along the circumference of the box 10, and the side flow channels inside the plurality of plate segments are independently arranged, and the side flow channels inside each plate segment are in communication with the bottom flow channel.

[0053] The side flow channels of the plurality of plate segments are not in communication, and each plate segment is in communication with the bottom flow channel. When the liquid coolant is injected into the inside of the liquid cooling flow channel, the liquid coolant needs to flow into the inside of the plurality of side flow channels through the bottom flow channel, so as to ensure that the liquid coolant fills the bottom flow channel and the side flow channel, which is beneficial to ensure the liquid cooling efficiency.

[0054] In another embodiment, the side plate 120 includes a plurality of plate segments sequentially arranged along the circumference of the box 10, and the side flow channels inside the plurality of plate segments are in communication.

[0055] The side flow channels of the plurality of plate segments are in communication, so as to realize that the side flow channel formed by the side plate 120 forms a complete flow channel along the circumference of the box 10, and the liquid coolant can flow in the inside of the side flow channel, so as to improve the flow efficiency of the liquid coolant in the inside of the liquid cooling flow channel in the box 10, thereby improving the assembly efficiency and facilitating the dynamic flow of the liquid coolant.

[0056] In the embodiment, the battery box further includes a plurality of baffles arranged in the inside of the side flow channel, and the plurality of baffles are arranged in the height direction of the box 10, and the baffles separate the side flow channel into a plurality of sub-flow channels arranged in the height direction of the box 10.

[0057] The side flow channel is divided into a plurality of sub-flow channels arranged in the height direction of the box 10 by arranging the baffles, which is beneficial to fill the next sub-flow channel after filling one sub-flow channel, so as to ensure that the side flow channel is completely filled, and the arrangement of the sub-flow channel is beneficial to increase the flow path of the liquid coolant, thereby improving the heat dissipation efficiency.

[0058] In the embodiment, the baffle plate has a through hole arranged in communication with the sub-flow channel, and the sub-flow channel close to the bottom plate 110 is in communication with the bottom flow channel. By arranging the through hole on the baffle plate, the liquid coolant flows between the adjacent two sub-flow channels through the through hole to sequentially fill the plurality of sub-flow channels.

[0059] In the plurality of baffle plates, the through holes in the inner part of the plate segments arranged opposite in the width direction of the box body 10 are arranged staggered in the length direction of the box body 10; in the plurality of baffle plates, the through holes in the inner part of the plate segments arranged opposite in the length direction of the box body 10 are arranged staggered in the width direction of the box body 10. The staggered through holes avoid the cooling liquid from bypassing the sub-flow channel and directly flowing in and out.

[0060] In the embodiment, when the baffle plate is provided with a plurality of baffle plates, the plurality of baffle plates form a plurality of sub-flow channels in the height direction of the box body 10, and the plurality of sub-flow channels are in communication through the through holes.

[0061] In one of the specific embodiments of the embodiment, the baffle plates on each plate segment are coplanar and connected, and the baffles 20 in the plurality of plate segments cooperate to form a ring structure to ensure that the flow efficiency of the liquid coolant in the inner part of the plurality of plate segments is substantially the same, which is conducive to achieving uniform filling of the liquid cooling flow channel and further ensuring the liquid cooling efficiency.

[0062] As shown in Figure 2 and Figure 4 , the baffle 20 includes a first plate segment 210 and a second plate segment 220, the first plate segment 210 extends in the length direction of the box body 10, the second plate segment 220 extends in the width direction of the box body 10, and the first plate segment 210 and the second plate segment 220 are arranged in cross.

[0063] Specifically, the cross arrangement of the first plate segment 210 and the plate segment facilitates the division of more installation grooves 130 to complete the installation of more battery cells; at the same time, the cross arrangement of the first plate segment 210 and the second plate segment 220 is conducive to providing support strength, thereby improving the overall strength of the battery box and ensuring the stable operation of the battery cells, further ensuring the stable operation of the battery pack.

[0064] Of course, the baffle 20 can only include a plurality of first plate segments 210, the first plate segments 210 extend in the length direction of the box body 10, and the plurality of first plate segments 210 are arranged spaced apart in the width direction of the box body 10, and the plurality of first plate segments 210 form a plurality of long strip-shaped installation grooves 130 for installing battery cells.

[0065] Of course, the baffle 20 can only include a plurality of second plate segments 220, the second plate segments 220 extend in the width direction of the box body 10, and the plurality of second plate segments 220 are arranged spaced apart in the length direction of the box body 10, and the plurality of second plate segments 220 form a plurality of long strip-shaped installation grooves 130 for installing battery cells.

[0066] In the embodiment, to ensure the dynamic circulation of the liquid coolant inside the liquid cooling flow channel, the battery box further comprises a water inlet nozzle and a water outlet nozzle, the water inlet nozzle is arranged on the side wall of the box body 10 and communicates with the liquid cooling flow channel for supplying liquid, and the water outlet nozzle is arranged on the side wall of the box body 10 and communicates with the liquid cooling flow channel for discharging liquid.

[0067] The water inlet nozzle and the water outlet nozzle can be arranged on the same plate segment of the side plate 120 or different plate segments of the side plate 120, the water inlet nozzle is arranged in communication with the coolant supply device pipe, and the water outlet nozzle is arranged in communication with the coolant recovery device pipe.

[0068] From the above description, it can be seen that the above-mentioned embodiments of the application achieve the following technical effects:

[0069] The battery box of the application adopts the liquid cooling flow channel arranged in communication inside the partition plate 20 and the box body 10, realizes omnidirectional liquid cooling of the battery cell, that is, five-face heat dissipation of the battery cell, improves the cooling efficiency, effectively controls the temperature of the battery cell, and prolongs the service life and stability of the battery cell.

[0070] The application adopts the partition plate 20 to correspondingly arrange the battery cell in the mounting groove 130, realizes independent installation of the battery cell, avoids the phenomenon of mutual interference between the battery cells, simultaneously separates the mounting groove 130 by using the partition plate 20, further guarantees that the liquid cooling flow channel wraps outside the battery cell for omnidirectional heat dissipation, guarantees the stability and safety of the battery cell, and further improves the overall performance of the battery pack.

[0071] The application adopts the phase change material layer 30 arranged on the inner wall surface and the bottom surface of the mounting groove 130, the phase change material layer 30 has the advantages of high thermal conductivity and strong heat absorption capacity, the arrangement of the phase change material layer 30 can achieve the effects of insulation and heat insulation, and guarantees the stability of the battery cell in use.

[0072] Obviously, the above-described embodiments are only a part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the application.

[0073] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0074] It should be noted that the terms "first", "second", and the like used in the description and the claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0075] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery box characterized by, The battery box comprises: a box body (10) having a containing cavity; a partition plate (20) arranged inside the containing cavity, the partition plate (20) separates the containing cavity into a plurality of installation grooves (130) corresponding to the electric cells, the outer circumferential surface of each electric cell is attached to the inner wall surface of the installation groove (130), and the electric cell is supported on the bottom surface of the box body (10); the box body (10) and the partition plate (20) have a liquid cooling flow channel arranged in communication, and the liquid cooling flow channel covers the outer circumferential surface and the bottom surface of the electric cell.

2. The battery pack of claim 1, wherein, A phase change material layer (30) is arranged on the groove inner wall surface and groove bottom surface of the installation groove (130), and the phase change material layer (30) is attached to the electric cell.

3. The battery pack of claim 1, wherein, The box body (10) comprises: a bottom plate (110), specifically a bottom flow channel, and the bottom of the partition plate (20) is arranged on the bottom plate (110); a side plate (120) arranged on the bottom plate (110), the bottom plate (110) and the side plate (120) enclose the containing cavity, the side plate (120) has a side flow channel, the end portion of the extension direction of the partition plate (20) is connected with the side plate (120), and the liquid cooling flow channel inside the partition plate (20) is in communication with the bottom flow channel and / or the side flow channel.

4. The battery box according to claim 3, wherein the bottom plate (110), the partition plate (20) and the side plate (120) are all hollow structures.

5. The battery box according to claim 3, wherein the side plate (120) comprises a plurality of plate segments arranged in sequence along the circumference of the box body (10), the side flow channels inside the plurality of plate segments are independently arranged, and the side flow channels inside each plate segment are all in communication with the bottom flow channel.

6. The battery box according to claim 3, wherein the side plate (120) comprises a plurality of plate segments arranged in sequence along the circumference of the box body (10), and the side flow channels inside the plurality of plate segments are in communication.

7. The battery pack of claim 3, wherein, The battery box further comprises a plurality of baffles arranged inside the side flow channel, the plurality of baffles are arranged at intervals along the height direction of the box body (10), the baffles separate the side flow channel into a plurality of sub-flow channels arranged along the height direction of the box body (10), the baffles have through holes arranged in communication with the sub-flow channels, and the sub-flow channels close to the bottom plate (110) among the plurality of sub-flow channels are in communication with the bottom flow channel.

8. The battery pack according to any one of claims 1 to 7, characterized by, The partition plate (20) comprises: a plurality of first plate segments (210) extending along the length direction of the box body (10), and the plurality of first plate segments (210) are arranged at intervals along the width direction of the box body (10); and / or a plurality of second plate segments (220) extending along the width direction of the box body (10), and the plurality of second plate segments (220) are arranged at intervals along the length direction of the box body (10).

9. The battery pack of claim 8, wherein, When the partition plate (20) comprises the first plate segment (210) and the second plate segment (220) arranged in cross, the liquid cooling flow channels in the first plate segment (210) and the second plate segment (220) are arranged in communication.

10. The battery box according to any one of claims 1 to 7, characterized by The battery box further comprises: a water inlet nozzle arranged on a side wall of the box body (10), the water inlet nozzle being in communication with the liquid cooling flow channel for liquid supply; a water outlet nozzle arranged on a side wall of the box body (10), the water outlet nozzle being in communication with the liquid cooling flow channel for liquid discharge.

11. A battery pack, characterized by The battery box comprises the battery box according to any one of claims 1 to 10.

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