Battery pack and electric device

Abstract

The utility model discloses a battery pack and an electric device, and belongs to the technical field of batteries. The battery pack comprises a liquid cooling plate, a battery cell group and a box body, the battery cell group is mounted on the plate surface of the liquid cooling plate, the battery cell group comprises a plurality of battery cells arranged along a first direction, a ventilation channel extending along a second direction is arranged between every two adjacent battery cells, and the liquid cooling plate is used for circulating a cooling medium and dissipating heat of the battery cells on the liquid cooling plate; one end of the box body is open, the box body covers the battery cell group and is connected with the plate surface of the liquid cooling plate, two opposite side surfaces of the box body along the second direction are both provided with air ports, and the air ports can be communicated with the ventilation channel so as to realize air-cooling heat dissipation of the battery cells, the battery pack has two heat dissipation modes of liquid cooling and air cooling, and the heat dissipation efficiency of the battery pack is improved. Therefore, the refrigeration requirements of the battery pack in different environment states are met. According to the power utilization device, the battery pack is applied, and the battery pack has multiple refrigeration modes, so that the refrigeration requirements in different environment states are met, and the cost can be reduced.

Description

TECHNICAL FIELD

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

[0002] The use and operating temperature of the battery cells in the battery pack has an important influence on the safety and service life of the entire battery pack. At present, the heat dissipation modes of the battery pack mainly include air cooling and liquid cooling. The air cooling has the problem of large temperature difference between different battery cells due to different refrigeration capacities of different battery cells, and the liquid cooling has the problem of high refrigeration cost.

[0003] For most battery packs, when the environmental temperature is too high (such as in summer), air cooling cannot meet the cooling demand of the battery pack, and liquid cooling is needed for refrigeration and heat dissipation; when the environmental temperature is relatively low (such as in spring, autumn and winter), air cooling can meet the refrigeration and heat dissipation demand of the battery pack, and there is no need to set a liquid cooling plate or other liquid cooling device in the battery pack.

[0004] Therefore, there is an urgent need for a battery pack to solve the above problems. Invention content

[0005] The present application aims to solve or at least alleviate part or all of the above problems. To this end, the present application aims to provide a battery pack and a power utilization device, which has multiple refrigeration modes to meet the refrigeration demand of the battery pack under different environmental conditions.

[0006] In order to achieve the above-mentioned target, the present application adopts the following technical solution:

[0007] In a first aspect, the present application provides a battery pack, comprising:

[0008] a liquid cooling plate for circulating cooling medium;

[0009] a battery cell group installed on the plate surface of the liquid cooling plate, the battery cell group comprising a plurality of battery cells arranged in a first direction, and adjacent two battery cells having a ventilation channel extending in a second direction, wherein the second direction is perpendicular to the first direction;

[0010] a box body having an open end, the box body being arranged outside the battery cell group and connected with the plate surface of the liquid cooling plate, and the two opposite side surfaces of the box body along the second direction both having air inlets, the air inlets being capable of being communicated with the ventilation channels.

[0011] As an optional solution of the battery pack, the installation position of the box body on the liquid cooling plate is adjustable along the first direction, so as to make the air inlets communicate with the ventilation channels or make the air inlets staggered with the ventilation channels.

[0012] As an optional solution of the battery pack, the open outer side of the box body has a fixed edge, the fixed edge has a fixed hole, the plate surface of the liquid cooling plate has an adjusting hole group, the adjusting hole group has at least two adjusting holes arranged at intervals in a first direction, and the adjusting holes in the adjusting hole group are alternatively connected with the fixed hole.

[0013] As an optional solution of the battery pack, the number of the fixed edges is multiple, and the multiple fixed edges are arranged in an intermittent or uninterrupted manner around the open outer periphery of the box body.

[0014] As an optional solution of the battery pack, each fixed edge has multiple fixed holes arranged at intervals along the extension direction thereof, and multiple adjusting hole groups are arranged at intervals along the circumferential direction of the liquid cooling plate, and the adjusting hole groups are arranged one by one corresponding to the fixed holes.

[0015] As an optional solution of the battery pack, the fixed hole is a through hole, and a nut is embedded in the adjusting hole; or

[0016] The fixed hole is a through hole, and the adjusting hole is a threaded hole.

[0017] As an optional solution of the battery pack, multiple battery cells arranged in a first direction form a group of battery cells, at least two groups of battery cells are arranged in a second direction, and the ventilation channels of each group of battery cells are correspondingly connected.

[0018] As an optional solution of the battery pack, the battery pack further comprises a partition member, and in the first direction, the partition member is arranged between two adjacent battery cells, and the partition member is provided with the ventilation channel.

[0019] As an optional solution of the battery pack, each partition member has multiple ventilation channels, and multiple ventilation channels are arranged at intervals along the height direction of the partition member.

[0020] In a second aspect, the application provides a power consumption device, comprising a functional system and the battery pack as any one of the above, and the battery pack is used to supply electric energy to the functional system.

[0021] The application has the following beneficial effects:

[0022] The battery pack provided by the application comprises a liquid cooling plate, a battery cell group and a box body, the battery cell group is installed on the plate surface of the liquid cooling plate, the battery cell group comprises a plurality of battery cells arranged along a first direction, adjacent two battery cells have a ventilation channel extending along a second direction, the liquid cooling plate is used for circulating cooling medium and cooling the battery cells thereon; one end of the box body is open, the box body is arranged outside the battery cell group and connected with the plate surface of the liquid cooling plate, the two opposite sides of the box body along the second direction both have air inlets, the air inlets can be connected with the ventilation channels to realize air cooling of the battery cells, and the battery pack has two cooling modes of liquid cooling and air cooling to meet the cooling requirements of the battery pack in different environmental conditions.

[0023] The power consumption device provided by the application can reduce the cost by applying the battery pack having a plurality of cooling modes to meet the cooling requirements in different environmental conditions. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the description of the embodiments of the application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the contents of the embodiments of the application and the drawings.

[0025] Figure 1 The structure schematic diagram of the battery pack provided by the embodiments of the application is shown.

[0026] Figure 2 The exploded schematic diagram of the battery pack provided by the embodiments of the application is shown.

[0027] Figure 3 The structure schematic diagram of the battery pack provided by the embodiments of the application in the state of corresponding connection of the air inlets and the ventilation channels is shown.

[0028] Figure 4 The structure schematic diagram of the battery pack provided by the embodiments of the application in the state of staggered arrangement of the air inlets and the ventilation channels is shown.

[0029] Figure 5 The structure schematic diagram of the partition plate provided by the embodiments of the application is shown.

[0030] Reference signs:

[0031] 1, liquid cooling plate; 11, adjusting hole group; 111, adjusting hole;

[0032] 2, battery cell;

[0033] 3, box body; 30, air inlet; 31, fixed edge; 311, fixed hole;

[0034] 4, partition member; 41, ventilation passage. DETAILED DESCRIPTION

[0035] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described drawings. It is being contemplated that the application can be implemented in other embodiments that do not depart from the spirit and scope of the claimed application.

[0036] In the present application, the terms "comprise", "contain", "have" or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0037] In the present application, the term "and / or", is a description of an associated relationship with the associated object, which means that there can be three kinds of relationships. For example, A and / or B, can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents a "and / or" relationship between the front and rear associated objects.

[0038] In the present application, the terms "connect", "combine", "couple", "mount" can be direct connection, combination, coupling or mounting, or indirect connection, combination, coupling or mounting. Among them, direct connection refers to the connection of two parts or components without the need for an intermediate part, and indirect connection refers to the connection of two parts or components with at least one intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0039] In the present application, those of ordinary skill in the art will understand that the relative terms used in connection with a quantity or a condition (for example, "about", "approximately", "substantially" and the like) include the value indicated and have the meaning indicated by the context. For example, the relative terms at least include the degree of error related to the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. related to a specific value. Such terms should also be considered to disclose the range defined by the absolute values of the two endpoints. The relative term can refer to a certain percentage (e.g. 1%, 5%, 10% or more) of the indicated value. The numerical value without the relative term should also be disclosed as a specific value with a tolerance. In addition, "substantially" when expressing the relative angular positional relationship (for example, substantially parallel, substantially perpendicular), can refer to a certain degree (e.g. 1 degree, 5 degrees, 10 degrees or more) added or subtracted from the indicated angle.

[0040] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0041] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0042] This application provides an electrical device, including a functional system and a battery pack. The battery pack supplies electrical energy to the functional system, enabling the functional system to perform a specific function. It is understood that the electrical device can be a vehicle, such as an electric vehicle, where the functional system is the electric vehicle's power system, and the battery pack supplies electrical energy to the power system to enable the electric vehicle to operate normally. The electrical device can also be an energy storage device, where the functional system is the energy storage device's discharge system, and the battery pack supplies electrical energy to the discharge system to enable the energy storage device to charge other products. Of course, the electrical device is not limited to the two examples above and can also be other types of electrical devices, which will not be listed here.

[0043] Figure 1 A schematic diagram of the structure of the battery pack provided in an embodiment of this application is shown. Figure 2 An exploded view of the battery pack provided in an embodiment of this application is shown. Figures 1 to 2 As shown, the battery pack includes a liquid cooling plate 1, a cell assembly, and a housing 3. The cell assembly is mounted on the surface of the liquid cooling plate 1 and includes multiple cells 2 arranged along a first direction. There is a ventilation channel 41 extending along a second direction between two adjacent cells 2. The liquid cooling plate 1 is used to circulate the cooling medium and dissipate heat from the cells 2 on it. One end of the housing 3 is open. The housing 3 covers the cell assembly and is connected to the surface of the liquid cooling plate 1. The two opposite sides of the housing 3 along the second direction have air vents 30. The air vents 30 can be connected to the ventilation channel 41 to achieve air cooling of the cells 2. The battery pack has two cooling modes, liquid cooling and air cooling, to meet the cooling needs of the battery pack under different environmental conditions.

[0044] In the embodiment, the liquid cooling plate 1 can be selected from the prior art, and the liquid cooling plate 1 is a conventional technology in the battery technical field, and the liquid cooling structure and cooling principle of the liquid cooling plate 1 will not be described here.

[0045] Without using air cooling, if the air outlet 30 is in communication with the ventilation channel 41, it is easy for foreign matters such as dust from the outside to enter the box body 3, thereby affecting the safety and service life of the battery cell 2. Therefore, the installation position of the box body 3 on the liquid cooling plate 1 is adjustable along the first direction, so that the air outlet 30 is in relative communication with the ventilation channel 41, or the air outlet 30 is staggered with the ventilation channel 41, so as to realize starting the air cooling mode or closing the air cooling mode according to actual needs, and reduce the probability of foreign matters such as dust from the outside entering the box body 3.

[0046] In addition, for the case that the outside environment temperature is low, the battery cell 2 does not need air cooling, and even needs to be heated by the liquid cooling plate 1 to ensure that it can normally charge and discharge. At this time, if the air outlet 30 is in communication with the ventilation channel 41, the temperature of the battery cell 2 will undoubtedly be low, thereby increasing the energy consumption of the liquid cooling plate 1. Therefore, in the case without air cooling, the air outlet 30 is staggered with the ventilation channel 41, which not only can avoid foreign matters such as dust from the outside entering the box body 3 to affect the normal use of the battery cell 2, but also can avoid the battery cell 2 being in a too low temperature environment, thereby reducing the energy consumption of the battery pack.

[0047] It should be noted that the relative communication between the air outlet 30 and the ventilation channel 41 includes complete communication and partial communication between the air outlet 30 and the ventilation channel 41, so as to adjust the air volume in the air cooling mode.

[0048] Figure 3 The structure schematic diagram of the battery pack in the case that the air outlet 30 is in communication with the ventilation channel 41 is shown. Figure 4 The structure schematic diagram of the battery pack in the case that the air outlet 30 is staggered with the ventilation channel 41 is shown. Figures 3 to 4 And combining Figure 2 As shown, the open outer side of the box body 3 has a fixed edge 31, the fixed edge 31 has a fixed hole 311, the plate surface of the liquid cooling plate 1 has an adjusting hole group 11, the adjusting hole group 11 has at least two adjusting holes 111 arranged at intervals along the first direction, and the adjusting hole 111 in the adjusting hole group 11 is connected with the fixed hole 311.

[0049] In an embodiment, the fixing hole 311 is a through hole, and the adjusting hole 111 is provided with a nut. A bolt is used to pass through the fixing hole 311 and is screwed with the nut in the adjusting hole 111 to achieve the fixed connection between the box body 3 and the liquid cooling plate 1. In another embodiment, the fixing hole 311 is a through hole, and the adjusting hole 111 is a threaded hole. A bolt is used to pass through the fixing hole 311 and is screwed with the adjusting hole 111 to achieve the fixed connection between the box body 3 and the liquid cooling plate 1. Of course, the connection mode of the fixing hole 311 and the adjusting hole 111 is not limited to the above two cases. Any scheme that can achieve the fixed connection between the fixing edge 31 and the liquid cooling plate 1 is acceptable, and will not be illustrated one by one here.

[0050] The number of the fixing edges 31 is multiple, and the multiple fixing edges 31 are arranged in an interrupted or uninterrupted manner around the outer periphery of the opening of the box body 3. Further, each fixing edge 31 has multiple fixing holes 311 arranged at intervals along the extension direction thereof, and multiple adjusting hole groups 11 are arranged at intervals along the circumferential direction of the liquid cooling plate 1, and the adjusting hole groups 11 are arranged one by one corresponding to the fixing holes 311. In this way, the connection strength between the fixing edge 31 and the liquid cooling plate 1 can be improved.

[0051] In the present embodiment, the box body 3 has one top surface and four side surfaces, the top surface is rectangular, and the four side surfaces are connected to the four edges of the top surface, respectively. Similarly, the number of the fixing edges 31 is also four, and the four fixing edges 31 are respectively connected perpendicularly to the outer periphery of the four side surfaces, and the box body 3 is fixedly connected to the liquid cooling plate 1 through the four fixing edges 31. For example, the box body 3 can be an integrally formed structure, so as to facilitate processing and manufacturing, and to shorten the assembly time.

[0052] Each fixing hole 311 corresponds to an adjusting hole group 11, and each adjusting hole group 11 has two adjusting holes 111 arranged at intervals along the first direction. When the fixing hole 311 of the fixing edge 31 is connected with one adjusting hole 111 in the adjusting hole group 11, the ventilation channel 41 between the air port 30 and the group of battery cells is completely correspondingly communicated. When the fixing hole 311 of the fixing edge 31 is connected with the other adjusting hole 111 in the adjusting hole group 11, the ventilation channel 41 between the air port 30 and the group of battery cells is arranged in a staggered manner.

[0053] In the present embodiment, the multiple battery cells 2 arranged along the first direction form a group of battery cells, and at least two groups of battery cells are arranged along the second direction, and the ventilation channels 41 of each group of battery cells 2 are correspondingly communicated. In this way, the number of battery cells 2 can be increased, the energy density of the battery pack can be improved, and the ventilation channels 41 of each group of battery cells 2 are correspondingly communicated, so as to ensure the smoothness of airflow circulation and improve the air cooling efficiency.

[0054] Further, the battery pack further comprises a partition member 4, and the partition member 4 is arranged between two adjacent battery cells 2 in the first direction, and the partition member 4 is provided with a ventilation channel 41. The partition member 4 can also support and position the battery cell 2, and ensure the stability of the installation of the battery cell 2.

[0055] Figure 5 The structure of the partition member 4 provided by the embodiment of the application is shown. As shown in the figure, the partition member 4 has a plurality of ventilation channels 41, and the plurality of ventilation channels 41 are arranged at intervals along the height direction of the partition member 4. For example, the partition member 4 can be a metal plate member, which has high structural strength and good heat dissipation effect, can support the battery cell 2, and can improve the heat dissipation effect of the battery cell 2. Figure 5

[0056] In the embodiment, a single partition member 4 corresponds to two air inlets 30, and each air inlet 30 extends along the height direction. The single partition member 4 has six ventilation channels 41, and the six ventilation channels 41 are arranged at intervals along the height direction of the partition member 4. The six ventilation channels 41 can guide and distribute the airflow, ensure the stable flow of the airflow, and improve the air cooling efficiency.

[0057] The battery pack provided by the application has two cooling modes of air cooling and liquid cooling. In actual application, four cooling modes of natural cooling, air cooling, liquid cooling, and air cooling and liquid cooling at the same time can be realized, which can adapt to the refrigeration requirements of different temperature environments and reduce the energy consumption of the battery pack.

[0058] When the battery pack is used in the same area, the cooling system can be switched in real time according to the changes of seasons or temperature. When liquid cooling is not needed, air cooling can be started to reduce the cost. When the temperature is suitable for the charging and discharging of the battery cell 2, the installation position of the box body 3 can be adjusted, and air cooling can be closed while liquid cooling is not needed. When the temperature is too low or too high so that air cooling cannot meet the refrigeration requirements, liquid cooling is started. When liquid cooling mode cannot meet the requirements, the installation position of the box body 3 can be adjusted, and air cooling and liquid cooling can be started at the same time.

[0059] The basic principles, main features and advantages of the application are shown and described above. Those skilled in the art should understand that the above embodiments do not limit the application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the application.​

Claims

1. A battery pack, characterized in that, include: Liquid cooling plate (1), used for circulating cooling medium; A battery cell assembly is mounted on the surface of the liquid cooling plate (1). The battery cell assembly includes a plurality of battery cells (2) arranged along a first direction. A ventilation channel (41) extending along a second direction is provided between two adjacent battery cells (2). The second direction is perpendicular to the first direction. The housing (3) has an open end. The housing (3) covers the outside of the battery cell assembly and is connected to the surface of the liquid cooling plate (1). The housing (3) has air vents (30) on two opposite sides along the second direction. The air vents (30) can be connected to the ventilation channel (41).

2. The battery pack according to claim 1, characterized in that, The mounting position of the housing (3) on the liquid cooling plate (1) is adjustable along the first direction so that the air outlet (30) is connected to the ventilation channel (41) or the air outlet (30) is staggered from the ventilation channel (41).

3. The battery pack according to claim 2, characterized in that, The outer side of the opening of the box (3) has a fixed edge (31), the fixed edge (31) has a fixed hole (311), the surface of the liquid cooling plate (1) has an adjustment hole group (11), the adjustment hole group (11) has at least two adjustment holes (111) spaced apart along a first direction, and one of the adjustment holes (111) in the adjustment hole group (11) is connected to the fixed hole (311).

4. The battery pack according to claim 3, characterized in that, The number of fixed edges (31) is multiple, and the multiple fixed edges (31) are arranged intermittently or continuously around the open periphery of the box body (3).

5. The battery pack according to claim 4, characterized in that, Each of the fixed edges (31) has a plurality of fixed holes (311) spaced apart along its extension direction, and a plurality of adjustment hole groups (11) are spaced apart along the circumference of the liquid cooling plate (1), and the adjustment hole groups (11) are corresponding to the fixed holes (311) one by one.

6. The battery pack according to claim 3, characterized in that, The fixing hole (311) is a through hole, and the adjusting hole (111) is fitted with a nut; or The fixing hole (311) is a through hole, and the adjusting hole (111) is a threaded hole.

7. The battery pack according to claim 1, characterized in that, Multiple battery cells (2) arranged along the first direction form a group of battery cells, and at least two groups of battery cells are arranged along the second direction, and the ventilation channels (41) of each group of battery cells are connected.

8. The battery pack according to any one of claims 1-7, characterized in that, The battery pack also includes a separator (4), which is provided between two adjacent cells (2) in the first direction, and the separator (4) has the ventilation channel (41).

9. The battery pack according to claim 8, characterized in that, Each of the partition members (4) has a plurality of ventilation channels (41), which are spaced apart along the height direction of the partition member (4).

10. An electrical appliance, characterized in that, It includes a functional system and a battery pack as described in any one of claims 1-9, the battery pack being used to supply electrical energy to the functional system.

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