Battery pack and energy storage device

Abstract

The utility model describes a battery pack and an energy storage device, the battery pack is provided with a plurality of accommodating spaces, the battery pack comprises a battery module, the battery module comprises a plurality of battery cells, and each battery cell is arranged in one accommodating space; the cooling part is arranged in one containing space, the multiple battery cells surround the cooling part, the cooling part is provided with a heat dissipation space, and the heat dissipation space is communicated with the external space in the height direction of the battery pack. Therefore, the heat dissipation space of the cooling part can exchange air with the outside and take away heat, and the cooling part is positioned among the plurality of battery cells, so that uniform heat dissipation of the plurality of battery cells can be realized, the temperature difference among the plurality of battery cells is reduced, the energy efficiency of the battery pack is improved, and the safety and reliability of the battery pack are also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack and an energy storage device. Background Art

[0002] As the power source for new energy electric vehicles, the battery pack is a crucial component. During operation, the battery pack reaches high temperatures. Battery packs typically contain multiple cells and a complex internal structure. Uneven heat dissipation or uneven internal temperature distribution can lead to significant temperature differences between cells, potentially impacting the battery pack's energy efficiency. Utility Model Content

[0003] In view of the above existing situation, the present invention provides a battery pack and an energy storage device to reduce the significant temperature difference between different battery cells.

[0004] In a first aspect, the present invention provides a battery pack having a plurality of accommodating spaces, the battery pack comprising: a battery module, the battery module comprising a plurality of battery cells, each of the battery cells being arranged in one of the accommodating spaces; a cooling member, arranged in one of the accommodating spaces, and the plurality of battery cells surrounding the cooling member, the cooling member having a heat dissipation space, and the heat dissipation space being communicated with the external space along the height direction of the battery pack.

[0005] Optionally, on the plane where the bottom surface of the battery pack is located, the orthographic projection of the outer contour of the cooling element is consistent with the orthographic projection of the outer contour of the battery cell.

[0006] Optionally, the battery pack further includes a heat sink, which includes a base and a plurality of protrusions provided on the base, with two adjacent protrusions spaced apart; the bottom of the battery module is connected to the heat sink, and the battery module and / or the cooling element are partially placed on the protrusions so that there is a gap between the battery module and / or the cooling element and the base.

[0007] Optionally, the protrusions extend along the length direction or the width direction of the battery pack, and an air duct that communicates with the external space is formed between two adjacent protrusions.

[0008] Optionally, the cross-section of the air duct gradually decreases along the direction from the battery module toward the base.

[0009] Optionally, the side of the base facing the battery module includes a ventilation area and a placement area arranged around the ventilation area, and the protrusion is located in the placement area; the battery module is arranged in the placement area, and the cooling element is at least partially arranged in the ventilation area.

[0010] Optionally, the base is provided with a through hole, and the through hole is located in the ventilation area.

[0011] Optionally, the battery pack further comprises a fan, and the fan is arranged in the heat dissipation space.

[0012] Optionally, the battery pack further comprises a heat pipe, and the heat pipe is arranged between the base and the battery cell.

[0013] Optionally, when the temperature of the battery cell is lower than a first temperature, the heat pipe works to heat the battery cell, and the fan rotates at a first rotating speed; and / or, when the temperature of the battery cell is higher than a second temperature, the heat pipe stops heating, and the fan stops working; and / or, when the temperature of the battery cell is higher than a third temperature, the fan rotates at a second rotating speed; and / or, when the temperature of the battery cell is higher than a fourth temperature, the fan rotates at a third rotating speed; wherein the first temperature, the second temperature, the third temperature and the fourth temperature are sequentially increased, and the first rotating speed, the second rotating speed and the third rotating speed are sequentially increased.

[0014] Optionally, the cooling member comprises a first side facing the heat dissipation member and a second side facing away from the heat dissipation member, the first side and / or the second side has a grid structure; and the heat dissipation space is connected with the external space through the interspace of the grid structure.

[0015] Optionally, the battery pack further comprises a heat-conducting adhesive, and the heat-conducting adhesive is arranged between the battery cell and the cooling member; and / or, the cooling member is made of a heat-conducting material.

[0016] In a second aspect, the utility model provides a kind of energy storage device, comprising the battery pack as described above.

[0017] The battery pack of the utility model relates to a plurality of containing spaces, which comprises: a battery module and a cooling member, wherein the battery module comprises a plurality of battery cells, each battery cell is arranged in a containing space; the cooling member is arranged in a containing space, and the plurality of battery cells surround the cooling member. The cooling member has a heat dissipation space, and along the height direction of the battery pack, the heat dissipation space is connected with the external space. Therefore, the heat dissipation space of the cooling member can exchange air with the outside, and carry away heat. And since the cooling member is located in the middle of the plurality of battery cells, this layout helps to achieve uniform heat dissipation of the plurality of battery cells, thereby reducing the temperature difference between the plurality of battery cells, improving the energy efficiency of the battery pack, and improving the safety and reliability of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only show some of the embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0019] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0020] Figure 1 is a schematic view showing a partial structure of a battery pack related to the present application.

[0021] Figure 2 is a schematic view showing a partial structure of a battery pack related to the present application. Figure 1 is an exploded view of the battery pack shown in

[0022] Figure 3 is a schematic view showing a partial structure of a battery pack related to the present application. Figure 1

[0023] Figure 4 is a schematic view showing a partial structure of a battery pack related to the present application. Figure 1

[0024] Figure 5 is a schematic view showing a partial structure of a battery pack related to the present application. Figure 4

[0025] Figure 6 is a schematic view showing a partial structure of a battery pack related to the present application. Figure 3 or Figure 4 is a schematic view showing a partial structure of a battery pack related to the present application.

[0026] Reference signs: 1, battery module; 11, battery cell; 2, cooling member; 21, grid structure; 3, heat dissipation member; 31, protrusion; 32, base; 33, through hole; 34, air duct; 4, heat pipe. DETAILED DESCRIPTION

[0027] Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. In the following description, the same parts are given the same reference numerals, and repeated description will be omitted. In addition, the drawings are merely schematic views, and the ratio of the size between the parts or the shape of the parts, etc. can be different from the actual. It should be noted that all directional references, such as up, down, left, right, front, back, etc., used in the following description are only used for explanation purposes to more clearly describe the relative position between the parts, the movement, etc. in a certain specific attitude, and if the specific attitude changes, the directional references also change accordingly.

[0028] ​​​It is also needed to be explained that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or a middle element can exist at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or a middle element can exist at the same time.

[0029] With reference to Figure 1 and Figure 2 , the application provides a battery pack which is provided with a plurality of accommodation spaces. The battery pack further comprises a battery module 1 and a cooling member 2. The battery module 1 comprises a plurality of battery cells 11, each of which is disposed in an accommodation space; the cooling member 2 is disposed in an accommodation space, and the plurality of battery cells 11 surround the cooling member 2. The cooling member 2 has a heat dissipation space, and the heat dissipation space is through to the outside space along the height direction of the battery pack.

[0030] According to the above structure, the cooling member 2 in the battery pack of the application is provided with a heat dissipation space, and the heat dissipation space is through to the outside space to exchange air with the outside to take away heat. Moreover, the cooling member 2 is located in the middle of the plurality of battery cells 11, so that this layout helps to realize uniform heat dissipation of the plurality of battery cells 11, thereby reducing the temperature difference between the plurality of battery cells 11, improving the energy efficiency of the battery pack, and also improving the safety and reliability of the battery pack.

[0031] With reference to Figure 1 , the height direction of the battery pack is the Z-axis direction, the width direction of the battery pack is the X-axis direction, and the length direction of the battery pack is the Y-axis direction.

[0032] In some embodiments, the battery pack can further comprise a fan which is disposed in the heat dissipation space. Thus, when the heat dissipation space exchanges air with the outside space, it can not only rely on natural convection, but also can accelerate the flow of air through the fan, thereby improving the heat dissipation effect, so that the heat in the battery pack can be quickly dispersed, and the temperature of each battery cell 11 can be better balanced.

[0033] With reference to Figure 2 , in some examples, the battery pack can have 9 accommodation spaces, and the accommodation spaces are arranged in a structure of three rows and three columns in the width direction and the length direction of the battery pack. The cooling member 2 is placed in the middle accommodation space, and the plurality of battery cells 11 are arranged in the surrounding accommodation spaces. In other examples, the battery pack can also have 25 accommodation spaces, and can also have 49 accommodation spaces, etc., and the cooling member 2 is placed in the middlemost accommodation space. Specifically, the number of accommodation spaces is not limited. It can be understood that the size and shape of the plurality of accommodation spaces in the application are equal, and the size of each accommodation space is just enough to accommodate one battery cell 11, and the plurality of accommodation spaces can also be interconnected.

[0034] In some embodiments, the outer contour of the cooling member 2 is consistent with the outer contour of the battery cell 11 in the plane where the bottom surface of the battery pack is located. In this way, the cooling member 2 can be regarded as a "dummy battery cell" arranged together with the plurality of battery cells 11. If the outer contour of the battery cell 11 is generally square, the cooling member 2 can also be square, and the cooling member 2 is arranged in the middle, and the plurality of battery cells 11 are arranged around the cooling member 2. In this way, in a three-row and three-column arrangement, the battery module 1 can also form a square structure. Conversely, if the outer contour of the cooling member 2 is triangular or circular, it is not conducive to the regular arrangement of the battery cells 11. In addition, the outer contour of the cooling member 2 is consistent with the outer contour of the battery cell 11 in the plane where the bottom surface of the battery pack is located. After the cooling member 2 and the battery cell 11 are arranged, the outer wall of the cooling member 2 can be tightly attached to the outer wall of the battery cell 11, thereby playing a mutual supporting role and being more stable in structure.

[0035] It should be noted that in the related art, the battery pack also has a shell, and the battery module 1 and the cooling member 2 are located in the shell, and the top of the cooling member 2 has a gap with the inner wall of the shell, so that the air in the heat dissipation space can flow out and exchange with the external air.

[0036] Referring to Figure 1 and Figure 3 In some embodiments, the battery pack further includes a heat dissipation member 3, the heat dissipation member 3 includes a base 32 and a plurality of protrusions 31 arranged on the base 32, and adjacent two protrusions 31 are arranged with a gap; the bottom of the battery module 1 is connected to the heat dissipation member 3, and the battery module 1 and / or the cooling member 2 are partially arranged on the protrusions 31, so that the battery module 1 and / or the cooling member 2 have a gap with the base 32. In this way, the bottom of the battery module 1 and / or the cooling member 2 is partially arranged on the protrusions 31 and in contact with the protrusions 31, and since the two protrusions 31 are arranged with a gap, the bottom of the battery module 1 and / or the cooling member 2 is suspended, thereby having a gap with the base 32. The gap can provide a space for heat dissipation of the battery module 1 and / or the cooling member 2, which is conducive to the ventilation and heat dissipation of the bottom of the battery module 1 and / or the cooling member 2.

[0037] Referring to Figure 1 and Figure 3 In some embodiments, the protrusions 31 extend along the length direction or the width direction of the battery pack, and adjacent two protrusions 31 form an air duct 34 that is in communication with the external space. It can be understood that in the present embodiment, the protrusions 31 are in a strip structure. In this way, the air duct 34 can provide a space for heat dissipation of the battery module 1 and / or the cooling member 2, which is conducive to the ventilation and heat dissipation of the bottom of the battery module 1 and / or the cooling member 2.

[0038] In other embodiments, the protrusions 31 can also be a plurality of protrusions distributed on the base 32.

[0039] Referring to Figure 6 , the cross section of the air duct 34 gradually decreases in the direction of the battery module 1 towards the base 32. For the convenience of description, the size change of the cross section can be regarded as the aperture gradually decreasing from large to small. Since the battery module 1 is located above the convex part 31, when the air supply direction of the fan is controlled to be towards the battery module 1, the air is blown out from the region with large aperture to the region with small aperture, so that the air passing through the region with small aperture is accelerated to flow, thereby being able to more effectively take away heat, improve heat exchange efficiency, and have better heat dissipation effect.

[0040] In some embodiments, the side of the base 32 towards the battery module 1 comprises a ventilation area and a placement area surrounding the ventilation area, and the convex part 31 is located in the placement area; the battery module 1 is arranged in the placement area, and the cooling member 2 is at least partially arranged in the ventilation area. Specifically, the cooling member 2 can be partially located in the ventilation area and partially located in the placement area and placed on the convex part 31, and the part of the cooling member 2 located in the ventilation area can be spaced apart from the base 32 and in a suspended state, thereby being more conducive to the exchange of air in the heat dissipation space of the cooling member 2 with external air and improving the heat dissipation effect. In some examples, the top of the battery module 1 is flush with the top of the cooling member 2, and the bottom of the battery module 1 is flush with the bottom of the cooling member 2, and the bottom of the cooling member 2 can be completely located in the ventilation area, but at this time the bottom of the cooling member 2 is also completely spaced apart from the base 32 and in a suspended state, thereby being able to facilitate the exchange of air in the heat dissipation space of the cooling member 2 with external air and improving the heat dissipation effect.

[0041] In some embodiments, the base 32 is provided with a through hole 33, and the through hole 33 is located in the ventilation area. Thus, the heat dissipation member 3 can have more space for air flow, thereby improving the heat dissipation capacity.

[0042] Referring to Figure 4 and Figure 5 , the battery pack further comprises a heat pipe 4 arranged between the base 32 and the battery cell 11. Thus, when the temperature of the battery cell 11 is low, the heat pipe 4 can be controlled to heat, so that the battery module 1 can work in a suitable environment to avoid the situation that the battery pack cannot normally charge and discharge when working in a low-temperature environment.

[0043] In some embodiments, when the temperature of the battery cell 11 is lower than a first temperature, the heat pipe 4 works to heat the battery cell 11, and the fan rotates at a first speed; and / or when the temperature of the battery cell 11 is higher than a second temperature, the heat pipe 4 stops heating, and the fan stops working; and / or when the temperature of the battery cell 11 is higher than a third temperature, the fan rotates at a second speed; and / or when the temperature of the battery cell 11 is higher than a fourth temperature, the fan rotates at a third speed; wherein the first temperature, the second temperature, the third temperature and the fourth temperature are sequentially increased, and the first speed, the second speed and the third speed are sequentially increased.

[0044] In some examples, the first temperature can be 5°C, the second temperature can be 15°C, the third temperature can be 35°C, and the fourth temperature can be 45°C. Specifically, the battery pack can be provided with a real-time internal temperature sensor, and the temperature sensor, the fan, and the heat pipe 4 are connected to the battery management system of the battery pack. When the temperature sensor detects that the temperature of the battery module 1 is lower than 5°C, the battery management system controls the heat pipe 4 to heat and controls the fan to run at a first wind speed, so that the fan sends hot air out and blows the hot air more evenly to each battery cell 11 to balance the temperature between the plurality of battery cells 11. When the temperature sensor detects that the temperature of the battery module 1 is higher than 15°C, at this time, the battery is at a more suitable working temperature, and the battery management system controls the heat pipe 4 and the fan to stop working. When the temperature sensor detects that the temperature of the battery module 1 is higher than 35°C, the battery management system controls the fan to run at a second wind speed, at this time, the fan can improve the speed of air flow, which helps to quickly take away the heat generated by the battery module 1, thereby maintaining the working temperature of the battery within a safe range. When the temperature sensor detects that the temperature of the battery module 1 is higher than 45°C, the battery management system controls the fan to run at a third wind speed, at this time, the fan can further improve the speed of air flow, which helps to quickly take away the heat generated by the battery module 1, thereby maintaining the working temperature of the battery within a safe range.

[0045] In some examples, the fan can rotate forward or backward. Specifically, when the temperature of the battery module 1 is lower than 5°C, the battery management system can control the fan to rotate forward, and the wind blows from the direction of the base 32 to the direction of the battery module 1. When the temperature of the battery module 1 is higher than 35°C, the battery management system can control the fan to rotate backward, and the wind blows from the direction of the battery module 1 to the direction of the base 32, at this time, the wind blows from the area with large hole diameter to the area with small hole diameter in the air duct 34, and the wind accelerates through the area with small hole diameter, thereby being able to more effectively take away the heat and improve the heat exchange efficiency, and the heat dissipation effect is better.

[0046] In some embodiments, the cooling member 2 includes a first side facing the heat dissipation member 3 and a second side facing away from the heat dissipation member 3, and the first side and / or the second side has a grid structure 21; the heat dissipation space is connected with the external space through the gaps of the grid structure 21. In some examples, it can be understood that the fan will produce a certain vibration during operation, and the first side and the second side can be provided with the grid structure 21, which can ensure that the fan can be located in the heat dissipation space and play a limiting role on the fan. In some examples, the grid structure 21 can protrude from the first side and / or the second side, avoiding that the base 32 or the inner wall of the shell of the battery pack closes the air outlet of the cooling member 2 and affects the air outlet.

[0047] In some embodiments, the battery pack further comprises a heat-conducting glue, which is bonded between the cooling member 2 and the battery cell 11. In this way, when there is a gap between the cooling member 2 and the base 32, i.e. the cooling member 2 is suspended, but the cooling member 2 is bonded to the battery cell 11, a relatively stable structure between the battery module 1 and the cooling member 2 can also be achieved. In some examples, the heat-conducting glue can be a metal powder filled glue, which is added with metal powder such as copper powder, aluminum powder, etc. to improve its heat conduction performance. In some examples, the heat-conducting glue can be a carbon powder filled glue, which has good heat conduction performance and is often used to fill glue to form a carbon powder filled glue with good heat conduction performance.

[0048] In some embodiments, the cooling member 2 is made of a heat-conducting material. Specifically, the cooling member 2 can be made of a metal material, such as copper, which has good heat conduction ability and can quickly and effectively conduct heat. In some examples, the cooling member 2 can also be made of aluminum, which is also an excellent heat-conducting metal. Although the heat conduction coefficient of aluminum is lower than that of copper, it is light in weight and low in cost, which is beneficial to reducing the weight and controlling the cost of the battery pack.

[0049] The present application also provides a power storage device comprising the battery pack mentioned above. Generally, in some industrial and commercial fields, due to the existence of large power demand, a large power storage device equipped with multiple battery packs can well adapt to these scenarios. Such a power storage device not only can provide sufficient power to meet the power demand in peak periods, but also can help users optimize power consumption costs and improve energy efficiency through energy storage and release.

[0050] In summary, the cooling member 2 of the battery pack according to the present application can exchange air with the outside to take away heat. Moreover, since the cooling member 2 is located in the middle of the plurality of battery cells 11, this layout helps to achieve uniform heat dissipation of the plurality of battery cells 11, thereby reducing the temperature difference between the plurality of battery cells 11, improving the energy efficiency of the battery pack, and also improving the safety and reliability of the battery pack.

[0051] In the description of the present application, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0052] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0053] The embodiments, implementation manners and related technical features of the present application can be combined, replaced with each other without conflict.

[0054] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application without departing from the technical solution content of the present application still falls within the scope of the technical solution of the present application.

[0055] Although the present application has been specifically described above in combination with the drawings and implementation manners, it can be understood that the above description does not limit the present application in any form. Those skilled in the art can deform and change the present application according to needs without deviating from the essential spirit and scope of the present application, and these deformations and changes all fall within the scope of the present application.

Claims

1. A battery pack, characterized in that: A plurality of accommodating spaces are provided, and the battery pack includes: A battery module, the battery module comprising a plurality of battery cells, each of the battery cells being disposed in one of the accommodation spaces; A cooling member is disposed in the accommodating space, and a plurality of the battery cells surround the cooling member. The cooling member has a heat dissipation space, and along the height direction of the battery pack, the heat dissipation space is communicated with the external space.

2. The battery pack according to claim 1, wherein: On the plane where the bottom surface of the battery pack is located, the orthographic projection of the outer contour of the cooling member is consistent with the orthographic projection of the outer contour of the battery cell.

3. The battery pack according to claim 1, wherein: The battery pack further includes a heat sink, the heat sink including a base and a plurality of protrusions provided on the base, with an interval between two adjacent protrusions; The bottom of the battery module is connected to the heat sink, and the battery module and / or the cooling element are partially placed on the protrusion, so that there is a gap between the battery module and / or the cooling element and the base.

4. The battery pack according to claim 3, wherein: The convex portion extends along the length direction or the width direction of the battery pack, and an air duct communicating with the external space is formed between two adjacent convex portions.

5. The battery pack according to claim 4, characterized in that: The cross section of the air duct gradually decreases along the direction from the battery module toward the base.

6. The battery pack according to claim 3, characterized in that: The side of the base facing the battery module includes a ventilation area and a placement area arranged around the ventilation area, and the protrusion is located in the placement area; The battery module is arranged in the placement area, and the cooling element is at least partially arranged in the ventilation area.

7. The battery pack according to claim 6, characterized in that: The base is provided with a through hole, and the through hole is located in the ventilation area.

8. The battery pack according to any one of claims 3 to 7, characterized in that: The battery pack further includes a fan, which is disposed in the heat dissipation space.

9. The battery pack according to claim 8, characterized in that: The battery pack further includes a heat pipe, which is arranged between the base and the battery core.

10. The battery pack according to claim 9, characterized in that: When the temperature of the battery core is lower than a first temperature, the heat pipe operates to heat the battery core, and the speed of the fan is the first speed; and / or, When the temperature of the battery core is higher than a second temperature, the heat pipe stops heating and the fan stops working; and / or, When the temperature of the battery core is higher than the third temperature, the speed of the fan is the second speed; and / or, When the temperature of the battery core is higher than a fourth temperature, the speed of the fan is a third speed; The temperatures of the first temperature, the second temperature, the third temperature and the fourth temperature increase in sequence, and the speeds of the first speed, the second speed and the third speed increase in sequence.

11. The battery pack according to any one of claims 1 to 7, characterized in that: The cooling element comprises a first side facing the heat dissipation element and a second side facing away from the heat dissipation element, wherein the first side and / or the second side has a grid structure; The heat dissipation space is connected to the external space through the gaps in the grille structure.

12. The battery pack according to any one of claims 1 to 7, characterized in that: The battery pack further includes a thermally conductive adhesive, wherein the thermally conductive adhesive is bonded between the battery core and the cooling element; and / or, The cooling element is made of a heat-conducting material.

13. An energy storage device, characterized in that: Comprising a battery pack as described in any one of claims 1-12.

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