Battery pack with blade cells and vehicle

Abstract

The utility model relates to battery technical field provides a kind of battery pack and vehicle with blade cell, above-mentioned battery pack with blade cell includes: blade cell module, bar sheet and lower shell;Along the length direction of battery pack, the side of blade cell module has multiple pole posts;Bar sheet is equipped with multiple, multiple bar sheet and multiple pole posts one-to-one corresponding connection;Each bar sheet from the height direction of battery pack extends towards the length direction of battery pack;Along the height direction of battery pack, lower shell is located at the bottom end of blade cell module;Lower shell includes edge beam and bottom plate;Edge beam extends towards the length direction of battery pack from the height direction of battery pack, and is connected with bottom plate;The bending part of edge beam is connected with the bending part of bar sheet, to pass through edge beam to bottom plate with the heat of bar sheet transmission.The battery pack with blade cell provided by the utility model can conduct heat exchange through the heat conduction of lower shell to bar sheet, reduce the temperature of bar sheet, and improve the electrical safety performance of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack and vehicle with blade cells. Background Technology

[0002] In the design and development of power battery packs for new energy vehicles, cell integration solutions are gradually becoming integrated with the vehicle. With increasing customer demand for faster charging, high-rate charging has become the mainstream trend. High-rate fast charging leads to rapid temperature increases in the cells, resulting in high heat generation in the battery cells and severe overheating of the terminals.

[0003] Currently, for battery packs with blade cells, the heat exchange between the plates and terminals and the air is slow, making it difficult to effectively control thermal runaway of the cells. Utility Model Content

[0004] This invention provides a battery pack and vehicle with blade cells to solve the problem in the prior art where the heat generated by the slabs of the battery pack with blade cells is too high and cannot be effectively cooled, thus failing to effectively control the thermal runaway of the cells.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, this utility model provides a battery pack with blade cells, comprising:

[0007] The blade cell module has multiple terminals on its side along the length of the battery pack.

[0008] The battery pack has multiple battery packs, and each of the multiple battery packs is connected to a corresponding electrode post; each battery pack is bent and extended from the height direction of the battery pack toward the length direction of the battery pack and away from the blade cell.

[0009] The lower housing is located at the bottom end of the blade cell module along the height direction of the battery pack. The lower housing includes a side beam and a bottom plate. The side beam bends and extends from the height direction of the battery pack toward the length direction of the battery pack and close to the bottom end of the blade cell module, and is connected to the bottom plate. The bent portion of the side beam is connected to the bent portion of the heat exchanger to transfer the heat of the heat exchanger to the bottom plate via the side beam.

[0010] According to the present invention, a battery pack with blade cells is provided, wherein the blade includes a bent portion and a connecting portion, the connecting portion is connected to the terminal post, and the bent portion is perpendicularly connected to the connecting portion;

[0011] The side beam includes a side plate and a bottom beam. One end of the bottom beam is connected to the bottom plate, and the other end of the bottom beam is perpendicularly connected to the side plate.

[0012] The bent section is connected to the bottom beam.

[0013] According to the present invention, a battery pack with blade cells is provided, wherein a phase change material layer is provided between the bent portion and the bottom beam, and the outer surface of the phase change material layer contains a plastic sealing layer.

[0014] According to the present invention, a battery pack with blade-shaped cells is provided, wherein the phase change material layer is a hydrogel layer.

[0015] According to the present invention, a battery pack with blade-shaped cells is provided, wherein a heat-conducting layer is provided between the bent portion and the bottom beam.

[0016] According to the present invention, a battery pack with blade cells is provided, wherein the thermally conductive layer includes at least one of a thermally conductive adhesive layer, a thermally conductive pad, or a thermally conductive structural adhesive layer.

[0017] According to the present invention, a battery pack with blade cells is provided, wherein the bent portion and the bottom beam are connected by fasteners.

[0018] According to the present invention, a battery pack with blade cells is provided, wherein along the height direction of the battery pack, the side beam facing the blade and the side of the bent portion facing the lower housing are provided with an insulating spray coating.

[0019] According to the present invention, a battery pack with blade-shaped cells is provided, wherein the insulating coating has an insulating withstand voltage value of V and a thickness of H, satisfying the following:

[0020] V≥30000H-3000.

[0021] Secondly, the present invention provides a vehicle comprising the battery pack described above.

[0022] This utility model provides a battery pack and vehicle with blade cells. By setting side beams and a bottom plate in the lower housing, the side beams are bent from the height direction of the battery pack towards the length direction of the battery pack and connected to the bottom plate to form a cavity to accommodate the blade cell module. By setting the heat exchangers at both ends of the blade cell module to be bent from the height direction of the battery pack towards the length direction of the battery pack and connected to the bent part of the side beam, the heat of the heat exchangers is transferred to the bottom plate through the side beam, so that the heat exchangers can be cooled in time. In addition to natural heat exchange with the air, the heat exchangers can also be conducted through the lower housing. Especially when the cell temperature rises rapidly and the heat generated by the heat exchangers is large, the heat is transferred to the lower housing through the connection of the bent part, which reduces the temperature of the heat exchangers and improves the electrical safety performance of the battery pack. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the battery pack with blade cells provided by this utility model.

[0025] Figure 2 This is a cross-sectional view of the battery pack with blade cells provided by this utility model.

[0026] Figure label:

[0027] 1. Blade cell module;

[0028] 2. Bracket; 21. Bending part; 22. Connecting part;

[0029] 3. Lower shell; 31. Side beam; 32. Bottom plate; 311. Side plate; 312. Bottom beam. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0033] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0035] The following is combined with Figures 1 to 2 The present invention will provide a detailed description of the battery pack with blade cells and the vehicle provided by the present invention through specific embodiments and application scenarios.

[0036] Firstly, such as Figure 1 and Figure 2 As shown, this embodiment provides a battery pack with blade cells, including: blade cell module 1, battery plate 2 and lower casing 3.

[0037] Along the length of the battery pack, the blade cell module 1 has multiple terminals on its side.

[0038] Multiple battery packs 2 are provided, and each battery pack 2 is connected to a corresponding terminal post; each battery pack 2 is bent and extended from the height direction of the battery pack towards the length direction of the battery pack and away from the blade cell.

[0039] Along the height direction of the battery pack, the lower housing 3 is located at the bottom end of the blade cell module 1; the lower housing 3 includes a side beam 31 and a base plate 32; the side beam 31 bends and extends from the height direction of the battery pack toward the length direction of the battery pack and close to the bottom end of the blade cell module 1, and is connected to the base plate 32; the bent portion 21 of the side beam 31 is connected to the bent portion 21 of the pad 2, so as to transfer the heat of the pad 2 to the base plate 32 through the side beam 31.

[0040] Understandably, the blade cell module 1 includes multiple cells, which are stacked to form the cell module, with heat-insulating material between the cells. For the blade cell module 1, since the positive and negative terminals of the cells are located at both ends of the module, along the length of the battery pack, the terminals of the cells are located at both ends of the blade cell module 1 and are arranged towards the outside of the module. The contact plates 2 connected to the terminals are also located on both sides of the blade cell module 1. A battery pack includes multiple blade cell modules 1 and a lower housing 3. Along the height direction of the battery pack, the multiple blade cell modules 1 are all located on the upper side of the lower housing 3.

[0041] The busbar 2 is an important component of the bus. The busbar 2 is connected to the terminal of the battery cell by welding. Multiple busbar 2s are connected to form a busbar, which connects multiple battery cells in parallel or in series.

[0042] The side beams 31 and the bottom plate 32 of the lower housing 3 form an accommodating cavity with an open end for supporting and accommodating multiple blade cell modules 1. The bottom plate 32 is located at the bottom of the battery pack, forming a bearing surface at the bottom of the battery pack. The side beams 31 are located on the side of the battery pack, surrounding the blade cell modules 1, and are bent from the height direction of the battery pack towards the length direction of the battery pack. The end of the bent portion 21 is connected to the bottom plate 32 to form the accommodating cavity.

[0043] Meanwhile, the heat exchange plate 2 extends along the height direction of the battery pack towards its length direction. The bent portion 21 of the heat exchange plate 2 connects to the bent portion 21 of the side beam 31. The heat generated by the heat exchange plate 2 can be transferred to the lower housing 3 from the connecting portion 22, providing real-time cooling for the heat exchange plate 2. This increases the heat exchange area of ​​the heat exchange plate 2, reduces the temperature difference between the lower housing 3 and the heat exchange plate 2, and contributes to the uniformity of the temperature field within the battery pack. In addition to natural heat exchange with the ambient air, the heat exchange plate 2 can also transfer heat to the lower housing 3 through thermal conduction via the dielectric layer, and then rapidly dissipate heat through the lower housing 3, effectively reducing the temperature of the heat exchange plate 2.

[0044] The battery pack with blade cells provided by this utility model has a side beam 31 and a bottom plate 32 set in the lower housing 3. The side beam 31 is bent from the height direction of the battery pack to the length direction of the battery pack and connected to the bottom plate 32 to form a cavity to support the blade cell module 1. The heat of the plate 2 located at both ends of the blade cell module 1 is transferred to the bottom plate 32 through the side beam 31 by bending from the height direction of the battery pack to the length direction of the battery pack and connecting to the bending part 21 of the side beam 31. This allows the plate 2 to be cooled in time. In addition to natural heat exchange with the air, the plate 2 can also be heat transferred through the lower housing 3. Especially when the cell temperature rises rapidly and the plate 2 generates a lot of heat, the heat is transferred to the lower housing 3 through the connection of the bending part 21, which reduces the temperature of the plate 2 and improves the electrical safety performance of the battery pack.

[0045] like Figure 2 As shown, the bar plate 2 in this embodiment includes a bending portion 21 and a connecting portion 22. The connecting portion 22 is connected to the pole post, and the bending portion 21 is perpendicularly connected to the connecting portion 22.

[0046] The side beam 31 includes a side plate 311 and a bottom beam 312. One end of the bottom beam 312 is connected to the bottom plate 32, and the other end of the bottom beam 312 is perpendicularly connected to the side plate 311. The bent part 21 is connected to the bottom beam 312.

[0047] Understandably, the connecting part 22 of the battery pack 2 is connected to the electrode post for current transmission, and the bent part 21 is located at the bottom end of the connecting part 22. The side plate 311 of the lower housing 3 surrounds the blade battery module 1, and the bottom beam 312 is located at the bottom end of the side plate 311. Since the bent part 21 is perpendicularly connected to the connecting part 22, and the bottom beam 312 is perpendicularly connected to the side plate 311, the bent part 21 and the bottom beam 312 are parallel and fit together. Therefore, there is no included angle between the bent part 21 and the bottom beam 312, and the contact area is large, ensuring that the heat of the battery pack 2 can be transferred to the bent part 21 through the connecting part 22, and heat conduction occurs at the contact surface between the bent part 21 and the bottom beam 312, and then transferred to the bottom plate 32 through the bottom beam 312, achieving good heat conduction between the battery pack 2 and the lower housing 3.

[0048] In this embodiment, the contact between the bending part 21 and the bottom beam 312 allows the point and line heat sources of the plate 2 to diffuse to the surface for heat dissipation, avoiding local hot spots. By utilizing the large heat capacity of the heat-conducting block of the bottom plate 32, a natural heat sink is formed, avoiding the increase in weight and cost caused by additional heat dissipation fins or fans.

[0049] like Figure 2 As shown, a phase change material layer is provided between the bent portion 21 and the bottom beam 312 in this embodiment, and the outer surface of the phase change material layer contains a plastic sealant layer.

[0050] Understandably, the phase change material layer undergoes a solid-liquid phase transition at a specific temperature, absorbing a large amount of latent heat while maintaining a constant temperature. When the battery cell 2 is under high-temperature conditions, the phase change material layer can absorb heat from the battery cell 2, cooling it and delaying the diffusion of high temperature to adjacent cells, thus blocking heat spread between different cells. The phase change material layer can maintain a constant temperature near the phase transition point, and the latent heat of the phase change material ensures effective thermal buffering.

[0051] To prevent leakage of the phase change material layer and to prevent the phase change material layer from undergoing a large volume change during phase change, which would affect the structure of the lower housing 3 and the blade cell module 1, this embodiment provides an encapsulation film on the outer surface of the phase change material layer to encapsulate the phase change material layer inside the encapsulation film.

[0052] The encapsulation film ensures that the phase change material layer maintains its shape consistency when a phase change occurs, thereby ensuring the installation stability of the lower housing 3 and the blade cell module 1.

[0053] In this embodiment, the phase change material layer is a hydrogel layer.

[0054] Understandably, the phase change material layer in this embodiment is a hydrogel layer. Hydrogels have a low leakage rate and a high elastic modulus, allowing them to compress and deform to fill within the encapsulation film, reducing interfacial thermal resistance and avoiding poor dissolution caused by rigid phase change material layers. Furthermore, the hydrogel layer has a high cycle life and good durability, maintaining a good heat absorption and release state throughout its service life.

[0055] like Figure 2 As shown, a heat-conducting layer is provided between the bent portion 21 and the bottom beam 312 in this embodiment.

[0056] Understandably, in order to enhance the heat exchange efficiency between the lower housing 3 and the heat exchange plate 2, a heat-conducting layer is provided between the bending portion 21 and the bottom beam 312 in this embodiment. The heat-conducting layer is a flexible dielectric layer, which can both conduct heat from the lower housing 3 to the heat exchange plate 2 and fill the installation gap between the lower housing 3 and the heat exchange plate 2, thereby compensating for the installation gap between the lower housing 3 and the heat exchange plate 2 and ensuring the stability and reliability of the lower housing 3 and the heat exchange plate 2 after installation.

[0057] The thermally conductive layer in this embodiment includes at least one of a thermally conductive adhesive layer, a thermally conductive pad, or a thermally conductive structural adhesive layer.

[0058] Understandably, the thermally conductive layer in this embodiment can be either a thermally conductive adhesive layer, which has low thermal resistance, high thermal conductivity, and can be coated into an extremely thin layer, maintaining elasticity after curing to alleviate thermal expansion stress; or a thermally conductive pad, which has a wide range of selectable thicknesses, can be directly applied without curing, simplifying the assembly process and facilitating maintenance and replacement; or a thermally conductive structural adhesive, which provides high-strength mechanical fixation while conducting heat, and exhibits excellent vibration and impact resistance.

[0059] like Figure 2 As shown, in this embodiment, the bent portion 21 and the bottom beam 312 are connected by fasteners.

[0060] Understandably, to enhance the connection strength between the bending portion 21 and the bottom beam 312, this embodiment uses fasteners to detachably connect the bending portion 21 and the bottom beam 312. During battery pack use, the fasteners ensure the secure connection between the bending portion 21 and the bottom beam 312. During battery pack maintenance, the bending portion 21 and the bottom beam 312 can be quickly disassembled and replaced using the fasteners, facilitating the separation of the battery pack plate 2 and the lower housing 3.

[0061] like Figure 2 As shown, along the height direction of the battery pack, the side beam 31 of this embodiment is provided with an insulating coating on the side facing the plate 2, and the side of the bent portion 21 facing the lower housing 3.

[0062] Understandably, the insulation withstand voltage refers to the highest voltage that the insulation layer can withstand without breakdown. Insufficient withstand voltage can lead to short circuits in the battery cells and trigger thermal runaway. Therefore, it is necessary to select a suitable insulation withstand voltage based on the rated voltage of the battery pack, and calculate the thickness H of the insulating coating using a formula to ensure that the thickness H of the insulating coating meets the insulation performance requirements of the battery pack 2 and the lower casing 3, resists high-voltage breakdown, and avoids thermal runaway caused by short circuits in the battery pack.

[0063] The insulating withstand voltage value of the insulating spray coating in this embodiment is V, and the thickness of the insulating spray coating is H, satisfying: V≥30000H-3000.

[0064] Understandably, the insulation withstand voltage refers to the highest voltage that the insulation layer can withstand without breakdown. Insufficient withstand voltage can lead to short circuits in the battery cells and trigger thermal runaway. Therefore, it is necessary to select a suitable insulation withstand voltage based on the rated voltage of the battery pack, and calculate the thickness H of the insulating coating using a formula to ensure that the thickness H of the insulating coating meets the insulation performance requirements of the battery pack 2 and the lower casing 3, resists high-voltage breakdown, and avoids thermal runaway caused by short circuits in the battery pack.

[0065] Secondly, this embodiment provides a vehicle including the battery pack described above.

[0066] Specifically, since the vehicle includes a battery pack with blade cells, and the specific structure of the battery pack with blade cells is as described in the above embodiments, the vehicle shown in this embodiment includes all the technical solutions of the above embodiments. Therefore, it has at least all the beneficial effects achieved by all the technical solutions of the above embodiments, which will not be repeated here.

[0067] It is understood that the vehicle in this embodiment can be a new energy vehicle, with the battery pack installed in the vehicle to provide power. Since the lower housing 3 and the battery plate 2 inside the battery pack are both bent and attached to each other, the battery plate 2 conducts heat through the lower housing 3, quickly transferring the heat of the battery plate 2 to the lower housing 3. The larger heat sink of the lower housing 3 is used to cool the battery plate 2, improving the safety performance of the battery pack and thus improving the safety factor of the vehicle.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery pack with blade-shaped cells, characterized in that, include: The blade cell module has multiple terminals on its side along the length of the battery pack. The battery pack has multiple battery packs, and each of the multiple battery packs is connected to a corresponding electrode post; each battery pack is bent and extended from the height direction of the battery pack toward the length direction of the battery pack and away from the blade cell. The lower housing is located at the bottom end of the blade cell module along the height direction of the battery pack. The lower housing includes a side beam and a bottom plate. The side beam bends and extends from the height direction of the battery pack toward the length direction of the battery pack and close to the bottom end of the blade cell module, and is connected to the bottom plate. The bent portion of the side beam is connected to the bent portion of the heat exchanger to transfer the heat of the heat exchanger to the bottom plate via the side beam.

2. The battery pack with blade cells according to claim 1, characterized in that, The bar includes a bent portion and a connecting portion, the connecting portion being connected to the pole post, and the bent portion being perpendicularly connected to the connecting portion; The side beam includes a side plate and a bottom beam. One end of the bottom beam is connected to the bottom plate, and the other end of the bottom beam is perpendicularly connected to the side plate. The bent section is connected to the bottom beam.

3. The battery pack with blade cells according to claim 2, characterized in that, A phase change material layer is provided between the bending portion and the bottom beam, and the outer surface of the phase change material layer contains a plastic sealing layer.

4. The battery pack with blade cells according to claim 3, characterized in that, The phase change material layer is a hydrogel layer.

5. The battery pack with blade cells according to claim 2, characterized in that, A heat-conducting layer is provided between the bent portion and the bottom beam.

6. The battery pack with blade cells according to claim 5, characterized in that, The thermally conductive layer includes at least one of a thermally conductive adhesive layer, a thermally conductive pad, or a thermally conductive structural adhesive layer.

7. The battery pack with blade cells according to claim 2, characterized in that, The bent section and the bottom beam are connected by fasteners.

8. The battery pack with blade cells according to claim 1, characterized in that, Along the height direction of the battery pack, the side beam facing the plate and the side of the bend facing the lower housing are provided with an insulating coating.

9. The battery pack with blade cells according to claim 8, characterized in that, The insulating coating has an insulation withstand voltage value of V and a thickness of H, satisfying the following: V≥30000H-3000.

10. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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