Energy storage battery module and battery energy storage module

Abstract

The application provides an energy storage battery module and a battery energy storage module, and relates to the technical field of battery cooling. The energy storage battery module comprises a heat exchange flow channel and a plurality of battery strings, the battery string comprises at least one battery monomer, the heat exchange flow channel comprises a length direction flow channel and a width direction flow channel, the length direction flow channel is connected with the width direction flow channel, the opposite sides of two adjacent battery strings are attached to the length direction flow channel, and the surfaces on the same side of the length direction of the two adjacent battery strings are attached to the width direction flow channel. The energy storage battery module provided by the application can uniformly exchange heat for the battery monomer.

Description

Technical Field

[0001] This invention relates to the field of battery cooling technology, and more specifically, to an energy storage battery module and a battery energy storage module. Background Technology

[0002] Typically, energy storage battery modules employ either air cooling or liquid cooling. Air cooling has relatively low efficiency and is insufficient to meet the heat dissipation requirements of high-rate charging and discharging. Currently, most manufacturers use a single-direction liquid cooling method at the bottom of the module. However, this method has limited heat removal capacity and can easily lead to excessive temperature differences between the top and bottom of individual battery cells. With a large number of cells and long coolant flow paths, temperature consistency across different cell locations becomes difficult to guarantee, and poor temperature consistency can significantly damage individual battery cells. Therefore, a new energy storage battery module is needed that can address the high heat generation and cooling requirements during high-rate fast charging, as well as the poor temperature consistency issues caused by numerous cells and long flow paths. Summary of the Invention

[0003] The first objective of this invention is to provide an energy storage battery module to solve the technical problem of uneven cooling of individual battery cells in the prior art.

[0004] The energy storage battery module provided by the present invention includes a heat exchange channel and a plurality of battery strings. The battery string includes at least one battery cell. The heat exchange channel includes a length flow channel and a width flow channel. The length flow channel is connected to the width flow channel. The opposite sides of two adjacent battery strings are in contact with the length flow channel, and the surfaces of the two adjacent battery strings on the same side along the length direction are in contact with the width flow channel.

[0005] The beneficial effects of the energy storage battery module of this invention are:

[0006] A scheme employing a length-direction flow channel connected to a width-direction flow channel on the same side along the length of two adjacent battery strings allows for heat exchange not only between the opposite sides of each adjacent battery string but also at both ends of the string's length. Furthermore, compared to existing technologies where heat exchange channels on the base plate only heat the bottom surface of individual battery cells, this scheme offers a larger heat exchange area and more uniform heat distribution. Compared to existing serpentine heat exchange channels that only heat one end of a battery string along its length, this scheme provides a larger heat exchange area and more thorough heat exchange.

[0007] In a preferred embodiment, the length flow channel includes two adjacent length sub-flow channels arranged side by side, the two length sub-flow channels forming a reverse angle, and the reverse angle and the width flow channel are located at opposite ends of the length sub-flow channel.

[0008] In a preferred embodiment, the width-direction channels on the same side of the length direction of the battery string are connected between the two length-direction channels.

[0009] In a preferred embodiment, among the plurality of length-oriented flow channels, a portion of the reverse bends are located at one end of the battery string, and a portion of the reverse bends are located at the other end of the battery string.

[0010] In a preferred embodiment, the reverse bends of adjacent length-direction flow channels are located at both ends of the battery string length direction.

[0011] In a preferred embodiment, the heat exchange channel is formed from a single pipe, and the inlet and outlet of the heat exchange channel are located on the same side of all the battery strings.

[0012] In a preferred embodiment, the inlet and outlet of the heat exchange channel are arranged adjacent to each other.

[0013] In a preferred embodiment, the energy storage battery module further includes a base plate, and the bottom surface of the heat exchange channel is fixedly connected to the base plate.

[0014] In a preferred embodiment, the bottom surface of the heat exchange channel is bonded to the base plate with an adhesive.

[0015] The second objective of this invention is to provide a battery energy storage module to solve the existing technical problem of uneven cooling of individual battery cells.

[0016] The battery energy storage module provided by the present invention includes the above-mentioned energy storage battery module.

[0017] By incorporating the aforementioned energy storage battery module into the battery energy storage module, the battery energy storage module thus possesses all the advantages of the aforementioned energy storage battery module, which will not be elaborated upon here. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments or background art of the present invention, the drawings used in the description of the embodiments or background art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 A top view of the heat exchange channel in the energy storage battery module provided in an embodiment of the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the energy storage battery module provided in an embodiment of the present invention;

[0021] Figure 3 A three-dimensional structural diagram of a single battery cell in an energy storage battery module provided in an embodiment of the present invention after it has been removed.

[0022] Figure 4 A top view of the heat exchange channel in an energy storage battery module provided as another implementation of the present invention;

[0023] Figure 5 A top view of the heat exchange channel in an energy storage battery module provided as another implementation of the present invention;

[0024] Figure 6 This is a three-dimensional disassembled view of the energy storage battery module provided in an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 10-Heat exchange channel; 11-Inlet; 12-Outlet; 13-Length channel; 14-Width channel; 15-Length sub-channel; 16-Reverse bend; 17-First category length channel; 18-Second category length channel;

[0027] 20 - Battery cell; 30 - Base plate. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0029] Example 1:

[0030] Figure 1 A top view of the heat exchange channel in the energy storage battery module provided in an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the energy storage battery module provided in an embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of a single battery cell removed from an energy storage battery module provided in an embodiment of the present invention; as shown. Figures 1-3 As shown, the energy storage battery module provided in this embodiment of the invention includes a heat exchange channel 10 and a plurality of battery strings. Each battery string includes at least one battery cell 20. The heat exchange channel 10 includes a length flow channel 13 and a width flow channel 14. The length flow channel 13 and the width flow channel 14 are connected. The opposite sides of two adjacent battery strings are in contact with the length flow channel 13, and the surfaces of the two adjacent battery strings on the same side in the length direction are in contact with the width flow channel 14.

[0031] Specifically, such as Figure 1 As shown, taking a rigid-cased battery cell 20 as an example, each battery string has two rigid-cased battery cells. These rigid-cased battery cells are typically cuboid in shape. The largest surfaces of the two rigid-cased battery cells form the side of the battery string opposite to other battery strings. That is, the electrode portions of both rigid-cased battery cells face upwards. The smaller surface area among the four surfaces of the non-electrode surface and the opposite surface of each rigid-cased battery cell is in contact with the corresponding surface of the other rigid-cased battery cell. This allows the battery string to have a larger surface area in contact with the heat exchange channel 10, thereby improving the cooling effect on the battery cell 20.

[0032] It should be noted that the definitions of the length-direction flow channel 13 and the width-direction flow channel 14 are based on whether the flow channel is located in the length or width direction of the battery string.

[0033] As described above, in each battery string, the side with the largest area of ​​the hard-shell battery cell forms the side of the battery string. Therefore, from... Figure 1 From this perspective, the longer side of the electrode surface lies within the surface with the largest area. Therefore, multiplying the longer side of the electrode surface by two gives the dimension of the battery string in one dimension, while the shorter side of the electrode surface gives the dimension of the battery string in another dimension. Clearly, the former dimension is significantly larger than the latter. Therefore, the former dimension corresponds to the length direction of the battery string, and the latter dimension corresponds to the width direction. The flow channel along the length direction of the battery string is called length-direction flow channel 13, and the flow channel along the width direction is called width-direction flow channel 14.

[0034] In other implementations, the battery string may consist of only one battery cell 20. If the battery cell is a hard-shell battery cell, then the side surface with the largest area of ​​the hard-shell battery cell is the opposite surface between adjacent battery strings, and a length-direction flow channel 13 is provided between such side surfaces.

[0035] The length-direction flow channel 13 is connected to the width-direction flow channel 14. The surfaces of two adjacent battery strings on the same side of the length direction are both in contact with the width-direction flow channel 14. This means that... Figure 1 For example, the first length channel 13 from top to bottom, its right end is located in... Figure 1 The width channels 14 at the top and bottom are connected, and the length channel 13 and the two width channels 14 form a T-shape rotated 90° clockwise. In other words, the two width channels 14 connected to the same length channel 13 are located on the same side of the length direction of the battery string.

[0036] The design employs a length-direction flow channel 13 connected to a width-direction flow channel 14 that adheres to the same side of the length direction of two adjacent battery strings. This combination of length-direction and width-direction flow channels 13 and 14 allows for heat exchange not only between the opposite sides of each pair of adjacent battery strings via the heat exchange channel 10, but also cooling at both ends of the battery string's length direction. Furthermore, compared to existing technologies where heat exchange channels on the base plate only heat the bottom surface of individual battery cells, this design offers a larger heat exchange area and more uniform heat distribution. Compared to existing serpentine heat exchange channels 10, which only heat one end of a battery string's length direction, this design provides a larger heat exchange area, resulting in more thorough heat exchange.

[0037] like Figures 1-3 As shown, preferably, the length flow channel 13 includes two length sub-flow channels 15 arranged side by side, the two length sub-flow channels 15 forming a reverse angle 16, and the reverse angle 16 and the width flow channel 14 are respectively located at the two ends of the length sub-flow channel 15.

[0038] Specifically, taking the above-described scheme where the battery cell 20 is a hard-shell battery cell as an example, since the cross-section of the battery cell 20 is rectangular, the length sub-channel 15 is straight. The reverse bend 16 is a 180° bend located at the intersection of two adjacent length sub-channels 15. If the battery cell 20 is a cylindrical battery cell, a portion of the length sub-channel 15 can be an arc shape that fits the surface of the cylindrical battery cell, while the remaining portions can be connected by straight lines or rounded corners. At the same ends of the two length sub-channels 15, a circular arc transition greater than 180° can be provided to connect the two length sub-channels 15.

[0039] In addition, in each length-oriented sub-channel 15, the end where the reverse bend 16 is located can be defined as the head, while the end connected to the width-oriented channel 14 can be defined as the tail.

[0040] Furthermore, the height of the aforementioned length-direction sub-channel 15 can be equal to the height of the battery cell 20. Each length-direction sub-channel 15 can contact the side with the largest area of, for example, the hard-shell battery cell, to exchange heat and improve heat exchange efficiency.

[0041] In another implementation, the flow direction can be different at different heights along the length of the flow channel 13. For example, taking the length of the flow channel 13 as a harmonica tube, if the harmonica tube consists of eight vertically arranged sub-tubes, the upper four sub-tubes can be... Figure 1 The flow is from left to right, and the four sub-pipes below are... Figure 1The flow is from right to left. In this length-oriented flow channel 13, only the upper four sub-pipes are connected to the upstream width-oriented flow channel 14, and only the lower four sub-pipes are connected to the downstream width-oriented flow channel 14.

[0042] like Figures 1-3 As shown, preferably, the width-direction flow channels 14 on the same side of the length direction of the battery string between the two length-direction flow channels 13 are connected.

[0043] That is, the two T-shapes mentioned above are oriented in the same direction and are placed side by side to form the shape of the Greek letter π with straight strokes.

[0044] Figure 4 A top view of the heat exchange channel in an energy storage battery module provided for another implementation of the present invention; as shown Figure 4 As shown, for example, in addition to the implementation described later, in another implementation, for an energy storage battery module including multiple battery strings arranged in parallel, the tail of each length-direction flow channel 13 is located on the same side of the energy storage battery module, while the head of each length-direction flow channel 13 is located on the other side. Therefore, from the outside of the overall rectangular energy storage battery module, except for the width-direction flow channel 14 connecting each length-direction flow channel 13 located on one side of the energy storage battery module, such as the long side, the remaining heat exchange flow channels 10 can cover the other exposed sides of the battery strings.

[0045] like Figures 1-3 As shown, preferably, in the plurality of length-direction flow channels 13, a portion of the reverse bend 16 is located at one end of the battery string, and a portion of the reverse bend 16 is located at the other end of the battery string.

[0046] Among them, several length-direction flow channels 13 located at the same end of the battery string at the reverse bend 16 can be connected by width-direction flow channels 14. In an energy storage battery module, the fluid entering from the inlet 11 of the heat exchange flow channel 10 can first enter this part of the length-direction flow channel 13 to exchange heat with part of the battery string. This allows the fluid with strong heat exchange capacity to exchange heat with the battery string that needs more heat exchange, so that it is maintained at a suitable temperature.

[0047] Figure 5 A top view of the heat exchange channel in an energy storage battery module provided for another implementation of the present invention; as shown Figure 5As shown, for example, if the energy storage battery module is applied in a cold region, then for an energy storage battery module with multiple battery strings arranged side by side, such as the first to tenth battery strings arranged sequentially, the insulation environment of the two outermost battery strings is more unfavorable. That is, the insulation environment of the first and tenth strings is more unfavorable, while that of the second and ninth strings is slightly better. The insulation environment of the third to eighth battery strings may be similar. If a hotter fluid is introduced into the heat exchange channel 10 to heat the battery cells 20 to a suitable temperature, then the inlet 11 of the heat exchange channel 10 can be connected to the length-direction flow channel 13 of the adjacent first and second battery strings and the length-direction flow channel 13 of the adjacent ninth and tenth battery strings, that is, the tails of these two length-direction flow channels 13 are on the same side. Then, the heat exchange channel 10 sequentially includes the 8th and 9th adjacent length flow channels 13, the 7th and 8th adjacent length flow channels 13... and the 2nd and 3rd adjacent length flow channels 13, the tails of these length flow channels 13 being on the other side.

[0048] By placing a portion of the reverse bend 16 in the length-direction flow channel 13 at one end of the battery string and a portion at the other end, the flexibility of the length-direction flow channel 13 arrangement can be increased, thereby meeting the thermal management needs of the energy storage battery module under different conditions.

[0049] like Figures 1-3 As shown, preferably, the opposite bends 16 of adjacent length-direction flow channels 13 are located at both ends of the battery string length direction.

[0050] For example, an energy storage battery module has 1-10 battery strings arranged sequentially adjacent to each other. A root is positioned between the opposite sides of the 1st and 2nd battery strings, the opposite sides of the 3rd and 4th battery strings, the opposite sides of the 5th and 6th battery strings, the opposite sides of the 7th and 8th battery strings, and the opposite sides of the 9th and 10th battery strings. Figure 1 The length of the flow channel 13 shown on the right is such that the root is positioned between the opposite sides of the 2nd and 3rd battery strings, the opposite sides of the 4th and 5th battery strings, the opposite sides of the 6th and 7th battery strings, and the opposite sides of the 8th and 9th battery strings. Figure 1 The length of the flow channel 13 on the left side is shown.

[0051] That is, the heat exchange channel 10 includes a first type of length-direction flow channel 17 and a second type of length-direction flow channel 18. Along the direction from the inlet 11 to the outlet 12 of the heat exchange channel 10, the first type of length-direction flow channel 17 is located upstream of all the second type of length-direction flow channels 18. The first type of length-direction flow channel 17 is only provided in the multiple battery strings arranged side by side, in the multiple battery strings between the first and last ends of the battery string arrangement direction, with the first type of length-direction flow channel 17 provided at every two battery strings. The second type of length-direction flow channel 18 is provided between the opposite sides of the remaining adjacent battery strings.

[0052] The length-oriented flow channel 13 layout is suitable for energy storage battery modules in high-temperature regions. Because the first and tenth battery strings at both ends have other battery strings on only one side, while the opposite side is empty, they can directly dissipate heat. Therefore, this layout provides good heat dissipation, eliminating the need for pre-cooling these two battery strings. However, for the second to ninth battery strings, since each string has other battery strings on both sides, the temperature of these other strings is likely higher than the ambient temperature, resulting in less effective heat dissipation than direct cooling to the external environment. Therefore, for the root... Figure 1 The left-hand flow channel 13 is closer to the inlet 11 of the heat exchange channel 10. Therefore, the heat exchange channel 10 with a lower temperature fluid can be used first to heat the heat exchange channel 10 with a poorer heat dissipation environment, thereby making more efficient use of the temperature of the heat exchange fluid.

[0053] By reversing the orientation of adjacent flow channels 13, two battery strings can be spaced apart in the same direction. These flow channels 13, connected from the inlet 11 of the heat exchange channel 10, allow the fluid to exchange heat with the battery strings on either side of each flow channel 13. This arrangement of flow channels 13 spaced apart by two battery strings allows for heat exchange with all battery strings, using either a higher-temperature fluid for heating or a lower-temperature fluid for cooling. This avoids the problem of excessively long heat exchange channels 10 at the end of the battery cells 20, which is a common issue with existing systems where the heat exchange channels 10 are too long. The flow channels 13 located on the other side at the root can then exchange heat with the opposing surfaces of the remaining battery strings, further stabilizing the temperature of the energy storage battery module.

[0054] like Figures 1-3 As shown, preferably, the heat exchange channel 10 is formed from a single tube, and the inlet 11 and outlet 12 of the heat exchange channel 10 are located on the same side of all the battery strings.

[0055] Specifically, harmonica tubes can be used as the tubing material. Since energy storage battery modules are not the same as the power battery modules used in electric or hybrid vehicles, they do not need to undergo the same tests of vibration, puncture, and impact as the power battery modules used in automobiles. Therefore, aluminum harmonica tubes can be used. Aluminum harmonica tubes are easy to process and bend.

[0056] The heat exchange channel 10 is formed from a single tube without any joints in the middle. The coolant does not come into contact with the battery cells 20, eliminating the risk of leakage and significantly improving safety and reliability. Furthermore, since the heat exchange channel 10 is formed from a single tube, this tube must extend continuously from the inlet 11 to the outlet 12, covering multiple sides of the energy storage battery module without any gaps in the horizontal length direction of each side. This not only increases the heat exchange area and improves heat exchange efficiency but also provides structural support and protection for these sides.

[0057] Moreover, the inlet 11 and outlet 12 of the heat exchange channel 10 are arranged on one side, which can make full use of the existing prefabricated containers to arrange the energy storage battery modules, facilitate the external cooling water pipelines on site, reduce the amount of on-site installation and construction, and improve construction efficiency.

[0058] like Figures 1-3 As shown, preferably, the inlet 11 and outlet 12 of the heat exchange channel 10 are arranged adjacent to each other.

[0059] By arranging the inlet 11 and outlet 12 of the heat exchange channel 10 adjacent to each other, the length of the outer side of the battery string to the length of the channel 13 can be increased as much as possible, thereby improving the heat exchange effect. Moreover, it also facilitates the connection of external pipes by operators, which helps to improve construction efficiency.

[0060] Figure 6 This is a three-dimensional disassembled view of the energy storage battery module provided in an embodiment of the present invention; as shown below. Figure 6 As shown, preferably, the energy storage battery module also includes a base plate 30, and the bottom surface of the heat exchange channel 10 is fixedly connected to the base plate 30.

[0061] Specifically, the height of the harmonica tube is the same as the height of the battery cell 20, and the mechanical environment at the energy storage battery module is significantly better than that at the power battery module, so the harmonica tube can play a supporting role as a structural component.

[0062] By fixing the bottom surface of the heat exchange channel 10 to the base plate 30, the load of the heat exchange channel 10 is transferred to the base plate 30. The heat exchange channel 10 can also serve as a support and protection for structural components, which helps to reduce the number of components used in the energy storage battery module and reduce manufacturing costs.

[0063] like Figure 6 As shown, preferably, the bottom surface of the heat exchange channel 10 is bonded to the base plate 30 with an adhesive.

[0064] Specifically, epoxy resin can be used as the adhesive.

[0065] The heat exchange channel 10 is connected by adhesive bonding, eliminating the need for drilling holes in the heat exchange channel 10 and reducing the risk of leakage. It also avoids the thermal stress problems associated with welding operations. If the heat exchange channel 10 and the base plate 30 are made of different materials, welding the heat exchange channel 10 and the base plate 30 would be difficult. Adhesive bonding offers high operational efficiency, minimizes post-processing impact, and facilitates the long-term use of the energy storage battery module.

[0066] Example 2:

[0067] Embodiment 2 also provides a battery energy storage module, including the above-mentioned energy storage battery module.

[0068] The battery energy storage module may include not only energy storage battery modules, but also electrical components such as relays for controlling whether charging or discharging is on or off.

[0069] By incorporating the aforementioned energy storage battery module into the battery energy storage module, the battery energy storage module thus possesses all the advantages of the aforementioned energy storage battery module, which will not be elaborated upon here.

[0070] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0071] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] In the above embodiments, descriptions of directions such as "up" and "down" are based on the accompanying drawings.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0074] Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy storage battery module, characterized by, The heat exchange channel (10) comprises lengthwise channels (13) and widthwise channels (14), the lengthwise channels (13) are connected with the widthwise channels (14), the opposite sides of two adjacent battery strings are attached to the lengthwise channels (13), and the surfaces of the same length direction of two adjacent battery strings are attached to the widthwise channels (14); The lengthwise channels (13) comprise two lengthwise sub-channels (15) arranged side by side, the two lengthwise sub-channels (15) form reverse corners (16), and the reverse corners (16) are located at both ends of the lengthwise sub-channels (15) respectively.

2. The energy storage battery module of claim 1, wherein, The widthwise channels (14) of the same length direction of the battery strings between two lengthwise channels (13) are connected.

3. The energy storage battery module of claim 1, wherein, In a plurality of lengthwise channels (13), part of the reverse corners (16) are located at one end of the battery strings, and part of the reverse corners (16) are located at the other end of all the battery strings.

4. The energy storage battery module of claim 3, wherein, The reverse corners (16) of adjacent lengthwise channels (13) are located at both ends of the length direction of the battery strings.

5. The energy storage battery module of any one of claims 1-4, wherein, The heat exchange channel (10) is formed by a pipe material, the inlet (11) and outlet (12) of the heat exchange channel (10) are located on the same side of the battery strings.

6. The energy storage battery module of claim 5, wherein, The inlet (11) and outlet (12) of the heat exchange channel (10) are arranged side by side.

7. The energy storage battery module of any one of claims 1-4, wherein, It also comprises a bottom plate (30), and the bottom surface of the heat exchange channel (10) is fixedly connected to the bottom plate (30).

8. The energy storage battery module of claim 7, wherein, The bottom surface of the heat exchange channel (10) is adhered to the bottom plate (30) by an adhesive.

9. A battery energy storage module, characterized by, The battery energy storage module comprises the energy storage battery module of any one of claims 1-8.

Images