Battery pack and power device

Abstract

The utility model discloses a battery pack and a power plant, the battery pack comprises: a housing, an accommodating cavity is formed in the housing, and the accommodating cavity is filled with a cooling liquid; the battery module is arranged in the accommodating cavity and is immersed in the cooling liquid, the battery module comprises a bracket and a plurality of battery monomers, the plurality of battery monomers are arranged at intervals along the extension direction of the bracket, a flow passage communicated with each other is defined between every two adjacent battery monomers, and the flow passages are communicated with the accommodating cavity; and the guide plate is fixed on at least one side of the battery module. According to the battery pack disclosed by the utility model, the cooling liquid is in direct contact with the battery monomers to absorb heat, the heat is taken out of the battery pack, the temperature of the battery monomers is kept stable, and the guide plate is arranged on the surface of one side of the battery module, so that the structural stability of the battery pack is improved, the overall performance of the battery pack is improved, and the service life of the battery pack is prolonged; and the safety of the battery pack is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of power devices, and particularly relates to a battery pack and a power device. Background Art

[0002] It is pointed out in the related art that the contemporary automotive industry is undergoing revolutionary changes, that is, traditional fuel vehicles are gradually being replaced by new energy vehicles. Among them, pure electric vehicles, as a type of new energy vehicle, are emerging. Many traditional fuel vehicle platforms directly replace the engine structure with a power battery pack structure, changing the power source of the vehicle from fuel to battery. With the emergence of new energy vehicles in the market, people have higher requirements for the endurance of electric vehicles. The same battery parameters mean that more batteries need to be arranged in the battery pack of an electric vehicle with a higher endurance mileage. However, this will lead to slow heat dissipation of the battery pack and obvious temperature rise, affecting the performance and safety of the battery pack. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides a battery pack with good cooling effect and high safety factor.

[0004] The utility model also provides a power device with the above battery pack.

[0005] The battery pack according to the first aspect of the utility model includes: a housing, a receiving cavity is formed inside the housing, and a coolant is filled in the receiving cavity; a battery module, the battery module is arranged in the receiving cavity and immersed in the coolant. The battery module includes a bracket and a plurality of battery cells. The bracket extends along a first direction, and the plurality of battery cells are arranged at intervals along the extending direction of the bracket. An interconnected flow passage is defined between every two adjacent battery cells, and the flow passages are all communicated with the receiving cavity; a flow guiding plate, the flow guiding plate is fixed to at least one side of the battery module, wherein the first direction is the length direction of the battery pack.

[0006] For the battery pack according to the utility model, the coolant directly contacts the battery cells to absorb heat and takes the heat out of the battery pack, keeping the temperature of the battery cells stable. And the flow guiding plate is arranged on one side surface of the battery module, which improves the structural stability of the battery pack, ensures that the coolant can evenly cover each battery cell, improves the overall performance of the battery pack, extends the service life of the battery pack, and ensures the safety of the battery pack.

[0007] In some embodiments, through holes penetrating the flow guiding plate are formed on the flow guiding plate, the flow passages are communicated with the receiving cavity through the through holes, and the coolant flows from one side of the battery module to the other side of the battery module.

[0008] In some embodiments, the housing includes an upper cover and a lower case. The lower case is formed with a liquid inlet, which communicates with the accommodating cavity. The liquid inlet is formed at a height not higher than 40% of the height of the battery module. An outlet pipe is disposed in the accommodating cavity and communicates with the accommodating cavity. The outlet pipe is higher than each battery cell.

[0009] In some embodiments, the bracket includes a first bracket and a second bracket. The first bracket and the second bracket are arranged at intervals. A plurality of corresponding mounting grooves are formed on one side of the first bracket opposite to the second bracket. One end of each of the plurality of battery cells is correspondingly arranged with the plurality of mounting grooves of the first bracket, and the other end of each of the plurality of battery cells is correspondingly arranged with the plurality of mounting grooves of the second bracket.

[0010] In some embodiments, there are a plurality of the battery modules, and the plurality of battery modules are arranged along a second direction. The battery pack further includes a baffle, which extends along the second direction. The baffle is disposed between the housing and the battery module and is hermetically connected to both the housing and the battery module, where the second direction is the width direction of the battery pack.

[0011] In some embodiments, a seal is provided between the upper cover and the lower case.

[0012] In some embodiments, the lower case is formed with a liquid inlet channel, which communicates with the liquid inlet and the accommodating cavity. The lower case is an integrally formed part.

[0013] In some embodiments, the battery pack further includes a high-voltage control box, which is disposed in the accommodating cavity and at the end of the plurality of battery modules. The high-voltage control box is electrically connected to each battery module.

[0014] In some embodiments, the ratio of the weight of the coolant to the total weight of the battery cells is not greater than 1.5.

[0015] The power device according to the second aspect of the present invention includes the battery pack according to the first aspect of the present invention.

[0016] By providing the battery pack of the first aspect, the overall performance of the power device is improved, and the safety and stability of the power device are ensured.

[0017] The additional aspects and advantages of the present invention will be partly given in the following description, partly become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1Schematic diagram of a battery pack according to an embodiment of the present utility model;

[0019] Figure 2 is Figure 1 Assembly schematic diagram of the battery module and the flow guide plate of the battery pack shown in;

[0020] Figure 3 is Figure 2 Schematic diagram of the battery module shown in;

[0021] Figure 4 is Figure 3 Internal schematic diagram of the battery module shown in;

[0022] Figure 5 is Figure 3 Front view schematic diagram of the battery module shown in;

[0023] Figure 6 is Figure 5 Schematic diagram of the A-A cross-section of the battery module shown in;

[0024] Figure 7 is Figure 4 Schematic diagram of another angle of the battery module shown in;

[0025] Figure 8 is Figure 1 Assembly schematic diagram of the baffle of the battery pack shown in;

[0026] Figure 9 is Figure 2 Assembly schematic diagram of the flow guide plate shown in;

[0027] Figure 10 is Figure 1 Explosion schematic diagram of the battery pack shown in.

[0028] Reference numerals:

[0029] 100, battery pack; 1, outer shell; 11, liquid inlet; 12, liquid outlet pipe; 13, liquid inlet flow channel; 14, upper cover; 15, lower shell; 2, battery module; 21, battery cell; 22, overcurrent channel; 23, bracket; 231, first bracket; 232, second bracket; 233, mounting groove; 234, bus bar; 235, fixing part; 3, flow guide plate; 31, through hole; 4, baffle; 5, high-voltage control box; 6, battery management module; 7, sampling wire harness; 8, high-voltage plug-in; 9, module copper bar. Detailed implementation manners

[0030] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0031] Reference will be made below Figures 1 - 10 to describe the battery pack 100 according to an embodiment of the first aspect of the present utility model.

[0032] As Figures 1 - 10 shown, the battery pack 100 according to an embodiment of the first aspect of the present utility model includes: a housing 1, a battery module 2, and a flow guide plate 3.

[0033] Specifically, a receiving cavity is formed in the housing 1, and the receiving cavity is filled with a coolant. The battery module 2 is disposed in the receiving cavity and immersed in the coolant. The battery module 2 includes a bracket 23 and a plurality of battery cells 21. The bracket 23 extends in a first direction, and the plurality of battery cells 21 are arranged at intervals along the extending direction of the bracket 23. An interconnected flow passage 22 is defined between every two adjacent battery cells 21. The flow passages 22 are all in communication with the receiving cavity. The flow guide plate 3 is fixed to at least one side of the battery module 2. The coolant directly contacts the battery cells 21 to absorb heat and takes the heat out of the battery pack 100, maintaining the temperature stability of the battery cells 21. The flow guide plate 3 is used to guide the flow direction of the coolant to ensure that the coolant can uniformly cover all the battery cells 21.

[0034] For the battery pack 100 according to the embodiment of the present utility model, the coolant directly contacts the battery cells 21 to absorb heat and takes the heat out of the battery pack 100, maintaining the temperature stability of the battery cells 21. And the flow guide plate 3 is disposed on one side surface of the battery module 2, which improves the structural stability of the battery pack 100, ensures that the coolant can uniformly cover each battery cell 21, improves the overall performance of the battery pack 100, extends the service life of the battery pack 100, and ensures the safety of the battery pack 100.

[0035] Referring to Figure 1 shown, the first direction is the length direction of the battery pack 100, and the second direction is the width direction of the battery pack 100.

[0036] In some embodiments of the present utility model, through holes 31 penetrating the flow guiding plate 3 in the thickness direction of the flow guiding plate 3 are formed on the flow guiding plate 3. The flow through channel 22 is communicated with the accommodation cavity through the through holes 31, and the coolant flows from one side of the battery module 2 to the other side of the battery module 2. That is to say, the coolant enters and exits the battery module 2 through the through holes 31, effectively improving the thermal management performance of the battery pack 100, ensuring uniform temperature distribution during the operation of the battery pack 100, and thus improving the efficiency and service life of the battery pack 100.

[0037] In short, the coolant flows into the flow through channel 22 in the battery module 2 through the through holes 31 on the flow guiding plate 3 on one side of the battery module 2 and flows out of the battery module 2 through the through holes 31 on the flow guiding plate 3 on the other side of the battery module 2.

[0038] Preferably, the width dimension of the flow through channel 22 is 0.5 mm - 4 mm, or 0.02 - 0.2 times the diameter of the battery cell 21.

[0039] In some embodiments, the distance between some adjacent two battery cells 21 is 0.02 - 0.1 times the diameter of the battery cell 21.

[0040] In some embodiments of the present utility model, the housing 1 is formed with a liquid inlet 11, the liquid inlet 11 is communicated with the accommodation cavity, the liquid inlet 11 is formed at a height not higher than 40% of the battery module 2, and an outlet pipe 12 is provided in the accommodation cavity. The outlet pipe 12 is communicated with the accommodation cavity, and the outlet pipe 12 is arranged above the battery module 2. As Figure 10 shown, the liquid inlet 11 is formed on the lower housing 15. An inlet channel is formed in the lower housing 15. The inlet channel is communicated with both the liquid inlet 11 and the accommodation cavity. An outlet pipe 12 is provided in the accommodation cavity. An outlet channel is defined in the outlet pipe 12. The outlet channel is communicated with the accommodation cavity, and the outlet pipe 12 is arranged higher than the battery module 2. Thereby, the pressure loss during the entry of the coolant is reduced, ensuring that the coolant fully contacts and cools each battery cell 21, and improving the thermal management efficiency.

[0041] In some embodiments of the present utility model, the bracket 23 includes a first bracket 231 and a second bracket 232. The first bracket 231 and the second bracket 232 are arranged at intervals. A plurality of corresponding mounting grooves 233 are formed on the opposite sides of the first bracket 231 and the second bracket 232. One end of a plurality of battery cells 21 is arranged corresponding to the plurality of mounting grooves 233 of the first bracket 231, and the other end of the plurality of battery cells 21 is arranged corresponding to the plurality of mounting grooves 233 of the second bracket 232. As Figures 3 - 7As shown, the battery cell 21 is a cylindrical battery. The cylindrical batteries are arranged along their radial directions. The first bracket 231 is provided at one end of the cylindrical battery in the axial direction, and the second bracket 232 is provided at the other end of the cylindrical battery in the axial direction. Both ends of the cylindrical battery are arranged in the corresponding mounting grooves 233. Thereby, the stability and consistency of the battery cell 21 are ensured, and the reliability of the battery pack 100 is improved.

[0042] As Figure 2 shown, the flow guide plate 3 and the bracket 23 are fixedly connected by fasteners. Busbars 234 are provided on the sides of the first bracket 231 and the second bracket 232 facing away from the battery cell 21. The busbars 234 are electrically connected to the battery cell 21. Fixing portions 235 are formed on the bracket 23. The battery module 2 is fixedly connected to the lower case 15 through the fixing portions 235.

[0043] Preferably, the bracket 23 and the lower case 15 are fixedly connected by dispensing glue.

[0044] In some embodiments of the present utility model, there are multiple battery modules 2. The multiple battery modules 2 are arranged along the second direction. The battery pack 100 further includes a baffle 4. The baffle 4 extends along the second direction. The baffle 4 is provided between the outer shell 1 and the battery module 2 and is hermetically connected to both the outer shell 1 and the battery module 2. Thereby, the flow direction of the coolant is ensured, and the chaotic flow of the coolant in the outer shell 1 is avoided.

[0045] In some embodiments of the present utility model, the outer shell 1 includes: an upper cover 14 and a lower case 15. A sealing member is provided between the upper cover 14 and the lower case 15. Thereby, the sealing performance of the accommodation cavity is ensured, and the leakage of the coolant is prevented.

[0046] Preferably, the sealing member can be structural glue, which seals the accommodation cavity while connecting the upper cover 14 and the lower case 15.

[0047] To ensure the structural strength and durability of the battery pack 100, preferably, the lower case 15 is an integrally formed part.

[0048] In some embodiments of the present utility model, as Figure 10 shown, the battery pack 100 further includes: a high-voltage control box 5. The high-voltage control box 5 is arranged in the accommodation cavity and is located at the end of the multiple battery modules 2. The high-voltage control box 5 is electrically connected to each battery module 2. Thereby, the layout pattern inside the battery pack 100 is simplified, the reliability and safety of the battery pack 100 are improved, and maintenance is facilitated.

[0049] In some embodiments of the present utility model, the ratio of the weight of the coolant to the total weight of the battery cells 21 is not greater than 1.5. In this way, the relationship between the thermal management performance of the battery pack 100 and the weight of the battery pack 100 is well balanced. While ensuring the cooling effect inside the battery pack 100, the weight of the battery pack 100 is reduced as much as possible.

[0050] Preferably, the number of the cooling battery cells 21 is not more than 12, and the length of the battery cells 21 in the axial direction is not more than 100 mm.

[0051] As Figure 10 shown, the battery management module 6 is arranged on one side of the battery module 2, the sampling wire harness 7 is arranged on the top of the battery module 2, the high-voltage plug-in 8 is arranged on the housing 1 and is adjacent to the high-voltage control box 5, and the module copper busbar 9 is arranged on the top of the battery module 2.

[0052] The power device according to the second aspect embodiment of the present invention includes the battery pack 100 according to the first aspect embodiment of the present invention.

[0053] By providing the battery pack 100 of the first aspect embodiment, the overall performance of the power device is improved, and the safety and stability of the power device are ensured according to the power device of the embodiment of the present invention.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0055] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0058] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, Comprising: A housing, an accommodation cavity is formed inside the housing, and a coolant is filled in the accommodation cavity; A battery module, the battery module is disposed in the accommodation cavity and immersed in the coolant, the battery module includes a bracket and a plurality of battery cells, the bracket extends along a first direction, and the plurality of battery cells are arranged at intervals along the extending direction of the bracket. An interconnected current-carrying channel is defined between every two adjacent battery cells, and each current-carrying channel communicates with the accommodation cavity; A deflector, the deflector is fixed to at least one side of the battery module; wherein, the first direction is the length direction of the battery pack.

2. The battery pack according to claim 1, characterized in that, Through holes penetrating the deflector are formed on the deflector, the current-carrying channels communicate with the accommodation cavity through the through holes, and the coolant flows from one side of the battery module to the other side of the battery module.

3. The battery pack according to claim 2, wherein, The housing includes: an upper cover and a lower shell, the lower shell is formed with a liquid inlet, the liquid inlet communicates with the accommodation cavity, the liquid inlet is formed at a height not higher than 40% of the battery module, and a liquid outlet pipe is disposed in the accommodation cavity. The liquid outlet pipe communicates with the accommodation cavity, and the liquid outlet pipe is higher than each battery cell.

4. The battery pack according to claim 3, characterized in that, The bracket includes a first bracket and a second bracket, the first bracket and the second bracket are arranged at intervals, and a plurality of corresponding mounting grooves are formed on the opposite sides of the first bracket and the second bracket. One end of the plurality of battery cells is correspondingly arranged with the plurality of mounting grooves of the first bracket, and the other end of the plurality of battery cells is correspondingly arranged with the plurality of mounting grooves of the second bracket.

5. The battery pack according to claim 4, characterized in that, A plurality of the battery modules are included, and the plurality of battery modules are arranged along a second direction. The battery pack further includes a baffle, the baffle extends along the second direction, the baffle is disposed between the housing and the battery module, and is hermetically connected to both the housing and the battery module, wherein the second direction is the width direction of the battery pack.

6. The battery pack according to claim 5, characterized in that, A sealing member is disposed between the upper cover and the lower shell.

7. The battery pack according to claim 6, characterized in that, The lower shell is formed with a liquid inlet channel, the liquid inlet channel communicates with the liquid inlet and the accommodation cavity, and the lower shell is an integrally formed part.

8. The battery pack according to any one of claims 1-7, characterized in that, Further comprising: A high-voltage control box, the high-voltage control box is disposed in the accommodation cavity and at the end of the plurality of battery modules, and the high-voltage control box is electrically connected to each battery module.

9. The battery pack according to any one of claims 1-7, characterized in that, The ratio of the weight of the coolant to the total weight of the battery cells is not greater than 1.

5.

10. A power device, characterized in that, Including the battery pack according to any one of claims 1-9.

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