Battery pack and electric device

Abstract

The utility model provides a kind of battery pack and electric equipment, wherein battery pack, comprising: box, including bottom plate, two end beam parts limit pieces of being arranged in the both ends of bottom plate and two side beam parts limit pieces of being arranged in the both sides of bottom plate, bottom plate, two end beam parts limit pieces and two side beam parts limit pieces between form containing space;Battery module is arranged in containing space, and battery module includes multiple batteries;First heat exchange plate, first liquid cooling passage is arranged in first heat exchange plate, first heat exchange plate is fixedly arranged between battery module and side beam part limit piece, and first heat exchange plate is heat conduction cooperation with battery module, first heat exchange plate and side beam part limit piece between there is first gap L1, and first gap L1 and the yield strength R between first heat exchange plate satisfy: 2≤L1×R / 10 2 ≤30.The technical scheme of the present application effectively solves the problem of poor heat exchange effect of heat exchange plates in related art.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery pack and electrical equipment. Background Technology

[0002] The battery pack contains battery modules, each with multiple batteries. Heat exchange plates extend along the battery arrangement direction and are located between the battery modules and the casing frame. During use, if the battery pack is subjected to impact or shaking, the force can easily be transmitted to the heat exchange plates inside the battery pack casing, causing deformation and affecting the normal flow of the liquid cooling medium within the heat exchange plates, resulting in poor heat exchange efficiency. Utility Model Content

[0003] The main objective of this invention is to provide a battery pack and electrical equipment to solve the problem of poor heat exchange effect of heat exchange plates in related technologies.

[0004] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, comprising: a housing, including a base plate, two end beam limiting members disposed at both ends of the base plate, and two side beam limiting members disposed on both sides of the base plate, wherein the base plate, the two end beam limiting members, and the two side beam limiting members form an accommodating space; a battery module disposed within the accommodating space, the battery module comprising multiple batteries; a first heat exchange plate, the extension direction of the first heat exchange plate being consistent with the length direction of the side beam limiting members, a first liquid cooling channel being disposed within the first heat exchange plate, the first heat exchange plate being fixedly disposed between the battery module and the side beam limiting members, and the first heat exchange plate and the battery module being thermally conductively connected, wherein a first gap L1 is provided between the first heat exchange plate and the side beam limiting members, and the first gap L1 and the yield strength R of the first heat exchange plate satisfy: 2≤L1×R / 10 2 ≤30.

[0005] According to another aspect of the present invention, an electrical device is provided, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0006] The technical solution of this utility model has the following beneficial effects: Because the first heat exchange plate and the battery module are thermally conductively connected, the liquid cooling medium flowing in the first liquid cooling channel within the first heat exchange plate can dissipate the heat of the battery module in a timely manner, improving the heat exchange effect. Simultaneously, during battery pack use, if it is subjected to impact or shaking, the first gap L1 between the first heat exchange plate and the side beam limiting member can absorb the energy during compression, reducing the risk of the first heat exchange plate being compressed, allowing the liquid cooling medium within the first heat exchange plate to flow normally, thus improving the heat exchange effect of the first heat exchange plate. Furthermore, the first gap L1 and the yield strength R of the first heat exchange plate satisfy the following relationship: 2 ≤ L1 × R / 10. 2≤30. This improves the installation strength of the first heat exchange plate and reduces the risk of deformation due to compression. Therefore, the technical solution of this application effectively solves the problem of poor heat exchange effect of heat exchange plates in related technologies. Attached Figure Description

[0007] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0008] Figure 1 A perspective structural schematic diagram of an embodiment of the battery pack according to the present invention is shown; not all battery modules are shown.

[0009] Figure 2 It shows Figure 1 An enlarged view of point A on the battery pack;

[0010] Figure 3 It shows Figure 1 A top view of the battery pack;

[0011] Figure 4 It shows Figure 3 An enlarged view of point B on the battery pack;

[0012] Figure 5 It shows Figure 3 An enlarged view of point C on the battery pack;

[0013] Figure 6 It shows Figure 1 A three-dimensional structural diagram of the battery pack after cross-section;

[0014] Figure 7 It shows Figure 6 An enlarged schematic diagram of point D of the battery pack;

[0015] Figure 8 It shows Figure 6 An enlarged view of point E on the battery pack.

[0016] The above figures include the following reference numerals:

[0017] 10. Housing; 11. Bottom plate; 111. Bottom liquid cooling plate; 112. Connecting plate; 12. End beam limiting component; 13. Side beam limiting component; 14. Accommodation space; 15. First heat exchange plate; 151. Folding plate; 152. Heat exchange plate body; 153. Protrusion; 16. Structural beam; 17. Second heat exchange plate; 171. Liquid cooling section; 172. Vibration absorbing section; 173. Vibration absorbing hole; 174. Vibration absorbing enclosure plate; 175. Reinforcing plate; 19. Longitudinal beam; 20. Battery module; 21. Fasteners. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0021] According to one aspect of this application, a battery pack is provided, such as Figures 1 to 4As shown, an embodiment of the battery pack includes: a housing 10, a battery module 20, and a first heat exchange plate 15. The housing 10 includes a base plate 11, two end beam limiting members 12 disposed at both ends of the base plate 11, and two side beam limiting members 13 disposed on both sides of the base plate 11. The base plate 11, the two end beam limiting members 12, and the two side beam limiting members 13 form an accommodating space 14. The extending direction of the first heat exchange plate 15 is consistent with the length direction of the side beam limiting members 13. The battery module 20 is disposed within the accommodating space 14, and the battery module 20 includes multiple batteries. A first liquid cooling channel is provided inside the first heat exchange plate 15. The first heat exchange plate 15 is fixedly disposed between the battery module 20 and the side beam limiting member 13, and the first heat exchange plate 15 is thermally conductively connected with the battery module 20. A first gap L1 is provided between the first heat exchange plate 15 and the side beam limiting member 13. The first gap L1 and the yield strength R of the first heat exchange plate 15 satisfy the following condition: 2≤L1×R / 10 2 ≤30.

[0022] The technical solution of the embodiment of the battery pack has the following beneficial effects: Since the first heat exchange plate 15 and the battery module 20 are thermally conductively connected, the liquid cooling medium flowing in the first liquid cooling channel within the first heat exchange plate 15 can dissipate the heat of the battery module 20 in a timely manner, improving the heat exchange effect. Simultaneously, during battery pack use, if it is subjected to impact or shaking, the first gap L1 between the first heat exchange plate 15 and the side beam limiting member 13 can absorb the energy during compression, reducing the risk of the first heat exchange plate 15 being compressed, allowing the liquid cooling medium within the first heat exchange plate 15 to flow normally, thus improving the heat exchange effect of the first heat exchange plate 15. Furthermore, the first gap L1 and the yield strength R of the first heat exchange plate 15 satisfy the following condition: 2 ≤ L1 × R / 10. 2 ≤30. This improves the installation strength of the first heat exchange plate 15 and reduces the risk of deformation caused by compression. Therefore, the technical solution of the battery pack embodiment effectively solves the problem of poor heat exchange effect of the heat exchange plate in the related art.

[0023] like Figures 1 to 4 and Figure 7 As shown, the first gap L1 is greater than or equal to 5 mm and less than or equal to 50 mm, and the yield strength R is greater than or equal to 30 MPa and less than or equal to 60 MPa. By limiting the size of the first gap L1 and the yield strength R of the first heat exchange plate 15, it is ensured that the first gap L1 can effectively absorb external energy when the battery pack is subjected to side impact or shaking. At the same time, the first heat exchange plate 15 has sufficient strength to resist deformation, thereby ensuring the normal flow of the liquid cooling medium in the first liquid cooling channel within the first heat exchange plate 15 and improving the heat exchange effect.

[0024] Specifically, the first gap L1 is 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, and 50mm. The yield strength R is 30MPa, 32MPa, 34MPa, 36MPa, 38MPa, 40MPa, 42MPa, 44MPa, 46MPa, 48MPa, 50MPa, 52MPa, 54MPa, 56MPa, 58MPa, and 60MPa.

[0025] like Figures 1 to 4 As shown, the housing 10 also includes multiple structural beams 16. Each structural beam 16 is connected to two side beam limiting members 13 on both sides. These structural beams 16 divide the accommodating space 14 into multiple sub-spaces, containing multiple sets of battery modules 20. Each sub-space contains at least one battery module 20, and multiple first heat exchange plates 15 are provided. The two ends of each first heat exchange plate 15 are fixed to two adjacent structural beams 16. By providing structural beams 16 within the housing 10 and forming multiple sub-spaces, the battery modules 20 can be more effectively supported and fixed. Simultaneously, the fixed connection between each first heat exchange plate 15 and the structural beam 16 enhances the overall structural stability of the battery pack.

[0026] like Figures 1 to 6 As shown, a folding plate 151 is fixedly connected to the end of the first heat exchange plate 15, and the folding plate 151 is fixed to the structural beam 16 by fasteners 21. The addition of the folding plate 151 increases the contact area between the first heat exchange plate 15 and the structural beam 16, and the fasteners 21 more firmly fix the first heat exchange plate 15 to the structural beam, improving the structural strength of the first heat exchange plate 15 under side impact, reducing the possibility of deformation of the first heat exchange plate 15, thereby ensuring the normal circulation of the first liquid cooling channel and maintaining the efficient thermal management of the battery module 20. Furthermore, it can prevent friction between the first heat exchange plate 15 and the structural beam 16 when the battery pack vibrates. The fasteners 21 are preferably bolts.

[0027] like Figures 3 to 7 As shown, a buffer layer (not shown in the figure) is provided in the first gap. The addition of a buffer layer in the first gap further absorbs the energy of the side impact, reduces the impact force on the first heat exchange plate 15, protects the first heat exchange plate 15 from damage, and ensures the normal flow of the liquid cooling medium and the effective heat exchange between the first heat exchange plate 15 and the battery module 20.

[0028] In this embodiment, the buffer layer is preferably a sponge layer, which is bonded to the first gap to provide compression and cushioning.

[0029] like Figures 1 to 7As shown, the housing 10 also includes a longitudinal beam 19 connecting two adjacent structural beams 16. The longitudinal beam 19, part of the structural beams 16, part of the side beam limiting members 13, and part of the bottom plate 11 enclose at least two sub-spaces, each sub-space containing at least one battery module 20. There are multiple first heat exchange plates 15 and battery modules 20. Every two first side heat exchange plates are located on either side of a battery module 20, and part of the first heat exchange plates 15 are located between the longitudinal beams 19 and the battery modules 20. A second gap L2 exists between the first heat exchange plates 15 and the longitudinal beams 19. The second gap L2 is smaller than the first gap L1, wherein the second gap L2 is greater than or equal to 2mm and less than or equal to 20mm. The combination of the longitudinal beams 19 and the structural beams 16 forms a more stable housing 10, protecting the internal battery modules 20 from impact. The second gap L2, in conjunction with the first gap L1, can more comprehensively absorb impact energy from different directions, while avoiding direct contact between the first heat exchange plate 15 and the longitudinal beam 19, reducing friction caused by vibration and potential structural damage.

[0030] The second gap L2 mentioned above is preferably 2mm or 3mm or 4mm or 5mm or 6mm or 7mm or 8mm or 9mm or 10mm or 11mm or 12mm or 13mm or 14mm or 15mm or 16mm or 17mm or 18mm or 19mm or 20mm.

[0031] The battery module 20 includes multiple batteries. These batteries can be directly connected in series, parallel, or in a hybrid configuration, and then housed within a casing. Alternatively, the battery module 20 can be composed of multiple batteries first connected in series, parallel, or in a hybrid configuration, and then further connected in series, parallel, or in a hybrid configuration to form a single unit housed within the casing 10. The battery module 20 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple batteries.

[0032] like Figures 1 to 3 As shown, the first heat exchange plate 15 includes a heat exchange plate body 152 and an extension 153 connected to the end of the heat exchange plate body 152. The extension 153 is fixed to the structural beam 16. The design of the extension 153 enhances the connection strength between the first heat exchange plate 15 and the structural beam 16, improves the stability of the battery pack when subjected to lateral impact or vibration, and enhances the deformation resistance of the first heat exchange plate 15, ensuring that the circulation of the liquid cooling medium is not affected and maintaining the thermal efficiency of the battery module 20.

[0033] like Figures 1 to 4As shown, the first heat exchange plate 15 is bonded to the battery module 20 via a structural adhesive layer (not shown in the figure). The structural adhesive layer is preferably a thermally conductive structural adhesive layer. Using this structural adhesive layer to bond the first heat exchange plate 15 to the battery module 20 not only improves the installation strength of the first heat exchange plate 15 but also enhances the heat transfer efficiency between the battery module 20 and the first heat exchange plate 15. This ensures that the heat generated by the battery module during operation can be quickly conducted away by the first heat exchange plate 15, thereby improving the overall thermal management performance of the battery pack.

[0034] The thermal conductivity of the thermally conductive adhesive layer in this embodiment is 3 W / m·K, which is much higher than the thermal conductivity of the double-sided adhesive (0.15 W / m·K), thus increasing the bonding strength and improving the heat dissipation effect of the first heat exchange plate 15.

[0035] like Figures 1 to 6 As shown, there are multiple first heat exchange plates 15 and battery modules 20. Two first heat exchange plates 15 are located on either side of a battery module 20, and some first heat exchange plates 15 are located between the side beam limiting member 13 and the battery module 20. The battery pack also includes a second heat exchange plate 17 located between two adjacent battery modules 20. A second liquid cooling channel is provided within the second heat exchange plate 17. The second heat exchange plate 17 is fixedly connected to the base plate 11. The first heat exchange plate 15 and / or the second heat exchange plate 17 include an upper liquid cooling section 171 and a lower vibration-absorbing section 172. The first liquid cooling channel and / or the second liquid cooling channel are located within the liquid cooling section 171, and the vibration-absorbing section 172 has multiple vibration-absorbing holes 173. By providing a liquid cooling section 171 and a vibration-absorbing section 172 within the first heat exchange plate 15 and the second heat exchange plate 17, and providing multiple vibration-absorbing holes 173 within the vibration-absorbing section 172, dual protection of the battery pack is achieved when subjected to impact or vibration. The liquid cooling section 171 focuses on heat dissipation, while the vibration absorption section 172 absorbs vibration energy, reduces the impact of vibration on the battery, and ensures stable operation of heat dissipation and the thermal performance of the battery.

[0036] like Figures 6 to 8 As shown, the vibration-absorbing section 172 includes a vibration-absorbing enclosure 174 connected below the liquid cooling section 171 and a reinforcing plate 175 disposed within the vibration-absorbing enclosure 174. A plurality of vibration-absorbing holes 173 are formed between the reinforcing plate 175 and the vibration-absorbing enclosure 174. The combination of the vibration-absorbing enclosure 174 and the reinforcing plate 175 forms the structure of the vibration-absorbing section 172, which can absorb vibration energy through the effective deformation of the vibration-absorbing holes 173 when the battery pack is subjected to vibration or impact. At the same time, the reinforcing plate 175 enhances the overall structural strength of the first heat exchange plate 15 and / or the second heat exchange plate 17, ensuring the integrity of the first liquid cooling channel and / or the second liquid cooling channel, and providing a more stable cooling effect for the battery module 20.

[0037] In this embodiment, the vibration-absorbing part 172 serves as an energy-absorbing structural component to protect the battery cell from being squeezed and deformed. The liquid cooling medium does not flow inside the multiple vibration-absorbing holes 173. When the first heat exchange plate 15 and / or the second heat exchange plate 17 are squeezed, the vibration-absorbing part 172 will be squeezed. Even if the vibration-absorbing part 172 is broken, there will be no liquid cooling medium flowing out and causing leakage risk.

[0038] like Figures 6 to 8 As shown, there is a gap L3 between the bottom surface of the first heat exchange plate 15 and the base plate 11, and the gap L3 is greater than or equal to 2mm. By setting the gap L3, the distance between the first heat exchange plate 15 and the base plate 11 is ensured, avoiding direct contact between the first heat exchange plate and the base plate 11 during side collisions, reducing the possibility of direct collisions between structures, protecting the integrity of the first heat exchange plate 15 and the flow of liquid cooling medium inside the battery pack.

[0039] like Figures 6 to 8 As shown, the interval L3 is equal to 2mm. By limiting the specific size of the interval L3, it is possible to ensure that the interaction between the first heat exchange plate 15 and the base plate 11 structural components is optimized under various operating conditions. This can effectively absorb impact energy, protect the integrity of the liquid cooling system, and ensure efficient heat dissipation of the first heat exchange plate 15 under normal operating conditions.

[0040] The aforementioned interval L3 is preferably 2mm or 3mm or 4mm or 5mm or 6mm or 7mm or 8mm or 9mm or 10mm or 11mm or 12mm or 13mm or 14mm or 15mm or 16mm or 17mm or 18mm or 19mm or 20mm.

[0041] like Figures 6 to 8 As shown, the base plate 11 includes a bottom liquid cooling plate 111 and a connecting plate 112 disposed above the bottom liquid cooling plate 111. A third liquid cooling channel is provided within the bottom liquid cooling plate 111, and the connecting plate 112 is attached to the bottom surface of the battery module 20. The bottom liquid cooling plate 111 provides liquid cooling heat dissipation from below for the battery module 20, working in conjunction with the first heat exchange plate 15 to form comprehensive thermal management, further improving the heat dissipation efficiency of the battery pack, ensuring temperature control of the battery under high load operation, extending battery life, and enhancing safety.

[0042] Preferably, the third liquid cooling channel is connected to the first liquid cooling channel and the second liquid cooling channel, so that the liquid cooling medium entering from the third liquid cooling channel enters the first liquid cooling channel and the second liquid cooling channel.

[0043] The aforementioned battery can be a secondary battery or a primary battery; it can also be a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this embodiment of the present invention is not limited in this regard. The battery can be cylindrical, flat, cuboid, or other shapes, and this embodiment of the present invention is not limited in this regard either. Batteries are generally classified into three types according to their packaging method: cylindrical batteries, square batteries, and pouch batteries, and this embodiment of the present invention is not limited in this regard either.

[0044] For example, a battery may include a casing, electrode assemblies, and an electrolyte. The casing houses the electrode assemblies and the electrolyte. The electrode assemblies consist of a positive electrode, a negative electrode, and a separator. The battery primarily operates by the movement of metal ions between the positive and negative electrode assemblies. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the coated positive current collector, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0045] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0046] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0047] Batteries can be equipped with terminals or tabs that connect to the battery, serving as electrical connections. Furthermore, batteries typically have pressure relief sections. These sections release substances (such as gases, liquids, or particulate matter) from the battery's interior when internal pressure becomes excessive (e.g., during thermal runaway), reducing internal pressure and preventing rapid pressurization that could lead to dangerous accidents like battery explosions. For example, pressure relief sections can be explosion-proof valves or explosion-proof discs.

[0048] According to another aspect of this application, an electrical device is provided, an embodiment of which includes a battery pack, the battery pack being the aforementioned battery pack. Since the aforementioned battery pack can solve the problem of poor heat exchange efficiency of heat exchange plates in the related art, the electrical device including this battery pack can solve the same technical problem.

[0049] The electrical devices covered in this application may include, but are not limited to, vehicles, mobile phones, tablets, laptops, ships, spacecraft, electric toys, and power tools. Vehicles may be fuel-powered vehicles, natural gas vehicles, new energy vehicles, or rail vehicles; new energy vehicles may be pure electric vehicles, hybrid vehicles, or range-extended vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0050] In the description of this utility model, it should be understood that "multiple" means a quantity of two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The box body (10) includes a bottom plate (11), two end beam limiting members (12) disposed at both ends of the bottom plate (11), and two side beam limiting members (13) disposed on both sides of the bottom plate (11). The bottom plate (11), the two end beam limiting members (12) and the two side beam limiting members (13) form an accommodating space (14). A battery module (20) is disposed within the receiving space (14), and the battery module (20) includes a plurality of batteries; A first heat exchange plate (15) extends in the same direction as the length of the side beam limiting member (13). A first liquid cooling channel is provided inside the first heat exchange plate (15). The first heat exchange plate (15) is fixedly disposed between the battery module (20) and the side beam limiting member (13), and the first heat exchange plate (15) is thermally conductively connected to the battery module (20). A first gap L1 is provided between the first heat exchange plate (15) and the side beam limiting member (13). The first gap L1 and the yield strength R of the first heat exchange plate (15) satisfy the following condition: 2≤L1×R / 10. 2 ≤30.

2. The battery pack according to claim 1, characterized in that, The first gap L1 is greater than or equal to 5 mm and less than or equal to 50 mm, and the yield strength R is greater than or equal to 30 MPa and less than or equal to 60 MPa.

3. The battery pack according to claim 1, characterized in that, The housing (10) also includes multiple structural beams (16), each of which is connected to two side beam limiting members (13) on both sides. The multiple structural beams (16) divide the accommodating space (14) into multiple sub-spaces. There are multiple sets of battery modules (20), and at least one battery module (20) is provided in each sub-space. There are multiple first heat exchange plates (15), and the two ends of each first heat exchange plate (15) are fixed to two adjacent structural beams (16).

4. The battery pack according to claim 3, characterized in that, A folding plate (151) is fixedly connected to the end of the first heat exchange plate (15), and the folding plate (151) is fixed to the structural beam (16) by fasteners (21).

5. The battery pack according to claim 3, characterized in that, A buffer layer is provided within the first gap.

6. The battery pack according to claim 3, characterized in that, The housing (10) also includes a longitudinal beam (19) connecting two adjacent structural beams (16). The longitudinal beam (19), a portion of the structural beams (16), a portion of the side beam limiting member (13), and a portion of the bottom plate (11) form at least two subspaces, each of which contains at least one battery module (20). There are multiple first heat exchange plates (15) and battery modules (20). Every two first heat exchange plates (15) are located on both sides of a battery module (20), and some of the first heat exchange plates (15) are located between the longitudinal beam (19) and the battery module (20). There is a second gap L2 between the first heat exchange plates (15) and the longitudinal beam (19). The second gap L2 is smaller than the first gap L1. The second gap L2 is greater than or equal to 2 mm and less than or equal to 20 mm.

7. The battery pack according to claim 3, characterized in that, The first heat exchange plate (15) includes a heat exchange plate body (152) and an extension (153) connected to the end of the heat exchange plate body (152), the extension (153) being fixed to the structural beam (16).

8. The battery pack according to any one of claims 1 to 7, characterized in that, The first heat exchange plate (15) is bonded to the battery module (20) through a structural adhesive layer.

9. The battery pack according to any one of claims 1 to 7, characterized in that, There are multiple first heat exchange plates (15) and battery modules (20). Every two first heat exchange plates (15) are located on both sides of a battery module (20), and some of the first heat exchange plates (15) are located between the side beam limiting member (13) and the battery module (20). The battery pack also includes a second heat exchange plate (17) located between two adjacent battery modules (20). The second heat exchange plate (17) is provided with a second liquid cooling channel. The second heat exchange plate (17) is fixedly connected to the base plate (11). The first heat exchange plate (15) and / or the second heat exchange plate (17) include an upper liquid cooling part (171) and a lower vibration absorbing part (172). The first liquid cooling channel and / or the second liquid cooling channel are disposed in the liquid cooling part (171). The vibration absorbing part (172) is provided with a plurality of vibration absorbing holes (173).

10. The battery pack according to claim 9, characterized in that, The vibration-absorbing part (172) includes a vibration-absorbing enclosure (174) connected below the liquid cooling part (171) and a reinforcing plate (175) disposed inside the vibration-absorbing enclosure (174), wherein a plurality of vibration-absorbing holes (173) are formed between the reinforcing plate (175) and the vibration-absorbing enclosure (174).

11. The battery pack according to any one of claims 1 to 7, characterized in that, The bottom surface of the first heat exchange plate (15) and the bottom plate (11) are separated by a gap L3, the gap L3 being greater than or equal to 2 mm.

12. The battery pack according to any one of claims 1 to 7, characterized in that, The base plate (11) includes a bottom liquid cooling plate (111) and a connecting plate (112) disposed above the bottom liquid cooling plate (111). A third liquid cooling channel is provided in the bottom liquid cooling plate (111), and the connecting plate (112) is attached to the bottom surface of the battery module (20).

13. An electrical device, comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1 to 12.

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