Battery module and battery pack

Abstract

The present disclosure relates to the technical field of batteries, and discloses a battery module and a battery pack; the battery module comprises a battery pack, a first heat exchange plate and a second heat exchange plate; the battery pack comprises a plurality of single batteries arranged in a first direction; the single battery has a first surface and a second surface; a first pole is arranged on the first surface; the second surface is arranged adjacent to the first surface and parallel to the first direction; the first heat exchange plate is arranged on the first surface; the width of the first heat exchange plate along a second direction is m; the second direction is parallel to the first surface and perpendicular to the extension direction of the first heat exchange plate; the second heat exchange plate is arranged on one second surface; the width of the second heat exchange plate along a third direction is n; the ratio of n to m is greater than or equal to 0.5 and less than or equal to 4.5; the third direction is parallel to the second surface and perpendicular to the first direction. The battery module can avoid excessive temperature difference between two second surfaces.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and more specifically, to a battery module and a battery pack. Background Technology

[0002] Temperature is one of the main factors affecting the performance of power batteries. Low temperatures can reduce the activity of chemical substances inside the power battery, significantly reduce the usable energy, and directly affect the driving range of the vehicle. Under high temperature conditions, the high-rate charging and discharging of the power battery can easily lead to thermal runaway, which will also have an adverse effect on the life of the power battery.

[0003] To improve the energy density of the battery pack, heat exchange plates cannot be installed on all sides of the battery pack. This can easily lead to a heat difference between the side of the battery pack with heat exchange plates and the opposite side without heat exchange plates, which can affect battery safety.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the aforementioned related technologies and to provide a battery module and a battery pack.

[0006] According to one aspect of this disclosure, a battery module is provided, comprising:

[0007] A battery pack includes a plurality of individual cells arranged sequentially along a first direction. Each individual cell has a first surface and a second surface. A first electrode post is disposed on the first surface. The second surface is disposed adjacent to the first surface and parallel to the first direction.

[0008] A first heat exchange plate is disposed on the first surface. The width of the first heat exchange plate along the second direction is m. The second direction is parallel to the first surface and perpendicular to the extension direction of the first heat exchange plate.

[0009] A second heat exchange plate is disposed on a second surface. The width of the second heat exchange plate along a third direction is n, and the ratio of n to m is greater than or equal to 0.5 and less than or equal to 4.5. The third direction is parallel to the second surface and perpendicular to the first direction.

[0010] The battery module disclosed herein has several advantages. First, since the terminal post is where heat is concentrated in a single cell, the first heat exchange plate is located on the first surface, enabling it to dissipate heat from the first surface, which is beneficial for the heat dissipation of the battery pack, effectively reducing the possibility of thermal runaway and ensuring the safety of the battery module. Second, since the second surface is adjacent to the first surface where the first terminal post is located, the second heat exchange plate is located on a second surface, which can dissipate heat from the second surface, which is beneficial for the heat dissipation of the battery pack. Moreover, setting the second heat exchange plate on only one second surface does not excessively encroach on the space for arranging single cells in the battery module, which is beneficial for improving energy density. Furthermore, the ratio of n to m being greater than or equal to 0.5 and less than or equal to 4.5 not only avoids excessive temperature difference between the two second surfaces but also ensures that the second heat exchange plate has a good cooling effect on the second surface.

[0011] According to another aspect of this disclosure, a battery pack is provided, comprising:

[0012] The battery module is the battery module described above.

[0013] The battery pack disclosed herein has several advantages. First, since the terminal post is where heat is concentrated in a single cell, the first heat exchange plate is located on the first surface, enabling it to dissipate heat from the first surface. This facilitates heat dissipation for the battery pack, effectively reduces the possibility of thermal runaway, and ensures the safety of the battery module and battery pack. Second, since the second surface is adjacent to the first surface where the first terminal post is located, the second heat exchange plate is located on a second surface, allowing it to dissipate heat from that surface, which is also beneficial for heat dissipation for the battery pack. Furthermore, the fact that the second heat exchange plate is located on only one second surface avoids excessively encroaching on the space for arranging single cells in the battery module, thus improving energy density. Finally, the ratio of n to m is greater than or equal to 0.5 and less than or equal to 4.5, which not only avoids excessive temperature differences between the two second surfaces but also ensures good cooling effect of the second heat exchange plate on the second surface, guaranteeing the safety of the battery module and battery pack.

[0014] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] Figure 1This is a schematic diagram of an example embodiment of the battery pack disclosed herein.

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of a battery pack in conjunction with the first and second heat exchange plates.

[0018] Figure 3 This is a schematic diagram of another example embodiment of the battery module of this disclosure, in which a battery pack cooperates with a first heat exchange plate and a second heat exchange plate.

[0019] Figure 4 This is a schematic diagram of another exemplary embodiment of the battery module disclosed herein, in which a battery pack cooperates with a first heat exchange plate and a second heat exchange plate.

[0020] Figure 5 This is a schematic diagram of another example embodiment of the battery module disclosed herein.

[0021] Figure 6 This is a structural schematic diagram of yet another example embodiment of the battery module disclosed herein.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Battery pack; 11. Single cell; 11a. Battery casing; 111. First surface; 1111. First part; 1112. Second part; 112. Second surface; 113. Third surface; 114. Fourth surface; 115. First terminal; 116. Second terminal; 117. Large surface; 118. Cell body; 119. Tab; 120. Adapter;

[0024] 2. First heat exchange plate;

[0025] 3. Second heat exchange plate;

[0026] 4. Heat insulation pad;

[0027] 10. Battery pack unit;

[0028] 20. Battery box; 201. First side frame; 202. Second side frame;

[0029] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0030] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0031] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0032] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0033] In this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0034] This disclosure provides an example embodiment of a battery module, with reference to... Figures 1-6As shown, the battery module may include a battery pack 1, a first heat exchange plate 2, and a second heat exchange plate 3. The battery pack 1 may include a plurality of individual cells 11 arranged sequentially along a first direction X. Each individual cell 11 has a first surface 111 and a second surface 112. A first electrode post 115 is provided on the first surface 111. The second surface 112 is adjacent to the first surface 111 and is parallel to the first direction X. The first heat exchange plate 2 is provided on the first surface 111. The width of the first heat exchange plate 2 along the second direction Y is m. The second direction Y is parallel to the first surface 111 and perpendicular to the first direction X. The second heat exchange plate 3 is provided on a second surface 112. The width of the second heat exchange plate 3 along the third direction Z is n. The ratio of n to m is greater than or equal to 0.5 and less than or equal to 4.5. The third direction Z is parallel to the second surface 112 and perpendicular to the first direction X.

[0035] In some exemplary embodiments of this disclosure, reference is made to Figure 1 As shown, the battery pack 1 may include a plurality of individual cells 11 arranged sequentially along the first direction X, and the individual cells 11 may be configured as cuboids. Of course, in other exemplary embodiments of this disclosure, the individual cells 11 may also be configured as cylinders, prisms, frustums, truncated cones, etc., as needed, which will not be described in detail here.

[0036] The single cell 11 has a first surface 111 and a second surface 112. A first electrode post 115 is provided on the first surface 111, and the second surface 112 is adjacent to the first surface 111 and is parallel to the first direction X.

[0037] Specifically, refer to Figure 2 As shown, a single battery cell 11 may include a battery casing 11a. When the single battery cell 11 is configured as a cuboid, the battery casing 11a is also configured as a cuboid casing. Therefore, the single battery cell 11 has six surfaces arranged in pairs opposite each other. A first electrode post 115 is provided on the first surface 111, and a third surface 113 is arranged opposite to the first surface 111. A second surface 112 is arranged adjacent to the first surface 111, and the second surface 112 is arranged parallel to the first direction X. That is, the second surface 112 is consistent with the arrangement direction of the multiple single batteries 11. Therefore, two second surfaces 112 are arranged opposite each other.

[0038] Reference Figure 4As shown, a battery cell is disposed within the battery casing 11a. The battery cell may include a cell body 118 and tabs 119. The cell body 118 may be of a stacked type or a wound type. The tabs 119 may be connected to the cell body 118. Specifically, a portion of an electrode sheet may extend beyond the cell body 118 and be bent to one side of the cell body 118 to form a tab 119. Two tabs 119 may be provided. The two tabs 119 are connected one-to-one to the first terminal 115 and the second terminal 116.

[0039] Reference Figure 1 and Figure 2 As shown, the first heat exchange plate 2 is disposed on the first surface 111. Since the electrode post is the location where heat is concentrated in the single battery 11, the first heat exchange plate 2 can dissipate heat from the first surface 111 where the first electrode post 115 is disposed, which is beneficial to the heat dissipation of the battery pack 1, effectively reducing the possibility of thermal runaway and ensuring the safety of the battery module.

[0040] Since the second surface 112 is adjacent to the first surface 111 where the first electrode post 115 is located, the second heat exchange plate 3 is located on one of the second surfaces 112. The second heat exchange plate 3 can dissipate heat from one of the second surfaces 112, which is beneficial to the heat dissipation of the battery pack 1. Moreover, the second heat exchange plate 3 is only located on one of the second surfaces 112, which will not excessively occupy the space for arranging individual cells 11 in the battery module, which is beneficial to improving the energy density.

[0041] However, if the second heat exchange plate 3 is only provided on one of the second surfaces 112, it may cause a temperature difference between the two second surfaces 112, resulting in uneven heat distribution in the individual cell 11.

[0042] Therefore, the width of the first heat exchange plate 2 along the second direction Y is set to m, and the width of the second heat exchange plate 3 along the third direction Z is set to n. The ratio of n to m is greater than or equal to 0.5 and less than or equal to 4.5. For example, the ratio of n to m can be 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.85, 2.95, 3.05, 3.15, 3.25, 3.35, 3.45, 3.55, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, etc.

[0043] Since the first heat exchange plate 2 has a certain cooling effect on the second surface 112 where the second heat exchange plate 3 is not provided, the width of the first heat exchange plate 2 along the second direction Y is set to be wider, so that the first heat exchange plate 2 can cool the second surface 112 where the second heat exchange plate 3 is not provided as much as possible, thereby reducing the temperature difference between the two second surfaces 112.

[0044] If the ratio of n to m is too large, the width of the second heat exchange plate 3 along the third direction Z will be too wide, and the cooling effect of the second heat exchange plate 3 on one of the second surfaces 112 will be too good, resulting in an excessive temperature difference between the two second surfaces 112.

[0045] If the ratio of n to m is too small, the width of the second heat exchange plate 3 along the third direction Z will be too small, resulting in poor cooling effect of the second heat exchange plate 3 on a second surface 112.

[0046] The above-mentioned numerical range not only avoids excessive temperature difference between the two second surfaces 112, but also ensures that the second heat exchange plate 3 provides good cooling effect for one of the second surfaces 112.

[0047] It should be noted that the second direction Y is parallel to the first surface 111 and perpendicular to the extension of the first heat exchange plate 2; the third direction Z is parallel to the second surface 112 and perpendicular to the first direction X. For example, the first direction X, the second direction Y, and the third direction Z can be perpendicular to each other.

[0048] Alternatively, the first heat exchange plate 2 is positioned closer to the second surface 112 without the second heat exchange plate 3, relative to the second surface 112 on which the second heat exchange plate 3 is located. This arrangement allows the first heat exchange plate 2 to be as close as possible to the second surface 112 without the second heat exchange plate 3, thereby cooling the second surface 112 without the second heat exchange plate 3 and reducing the temperature difference between the two second surfaces 112.

[0049] In some exemplary embodiments of this disclosure, reference is made to Figure 1 and Figure 2 As shown, a second terminal 116 is also provided on the first surface 111, that is, the first terminal 115 and the second terminal 116 are located on the same side of the single cell 11. Specifically, the first terminal 115 and the second terminal 116 are located at both ends of the first surface 111 along the second direction Y. The first heat exchange plate 2 is located between the first terminal 115 and the second terminal 116. The first heat exchange plate 2 can dissipate heat from the first terminal 115 and the second terminal 116 simultaneously, which is beneficial to the heat dissipation of the battery pack 1.

[0050] Optionally, the distance between the first pole post 115 and the second pole post 116 along the second direction Y is m1, and the ratio of m to m1 is greater than or equal to 0.5 and less than 1. For example, the ratio of m to m1 can be 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc.

[0051] Since the first heat exchange plate 2 is generally made of metal, if the ratio of m to m1 is 1, it will cause the first heat exchange plate 2 to come into contact with the first pole 115 and the second pole 116. The first heat exchange plate 2 will connect the first pole 115 and the second pole 116, resulting in a short circuit. Therefore, the ratio of m to m1 cannot be 1.

[0052] If the ratio of m to m1 is too small, the width of the first heat exchange plate 2 along the second direction Y will be too small, resulting in poor cooling effect of the first heat exchange plate 2, which is not conducive to heat dissipation of the first pole 115 and the second pole 116.

[0053] The above-mentioned numerical range can ensure the cooling effect of the first heat exchange plate 2, which is beneficial to the heat dissipation of the first pole 115 and the second pole 116.

[0054] In some exemplary embodiments of this disclosure, reference is made to Figure 3 As shown, a second electrode post 116 is provided on the third surface 113, that is, the first electrode post 115 and the second electrode post 116 are provided on opposite sides of the single cell 11.

[0055] The first surface 111 may include a first portion 1111 and a second portion 1112, which are disposed on opposite sides of the first pole post 115 along the second direction Y. The dimension of the first portion 1111 along the second direction Y is smaller than that of the second portion 1112 along the second direction Y, that is, the first pole post 115 is disposed off-center from the central axis on the first surface 111. The first heat exchange plate 2 is disposed on the second portion 1112, which has a larger dimension along the second direction Y. Therefore, the width of the first heat exchange plate 2 along the second direction Y can be set to be wider, which is beneficial for heat dissipation.

[0056] The first part 1111 is closer to the second heat exchange plate 3 than the second part 1112. In other words, the first electrode post 115 is closer to the second heat exchange plate 3 than the second part 1112. The first electrode post 115, where heat is concentrated in the individual battery cell 11, can dissipate heat simultaneously through the first heat exchange plate 2 and the second heat exchange plate 3. This is beneficial for the heat dissipation of the battery pack 1, effectively reducing the possibility of thermal runaway and ensuring the safety of the battery module. Furthermore, the first heat exchange plate 2 is closer to the second surface 112 without the second heat exchange plate 3, allowing it to cool the second surface 112 without the second heat exchange plate 3, thereby reducing the temperature difference between the two second surfaces 112.

[0057] The second heat exchange plate 3 may protrude from the first surface 111 in the third direction Z, and the second heat exchange plate 3 may protrude from the third surface 113 in the third direction Z.

[0058] Of course, in some exemplary embodiments of this disclosure, the second heat exchange plate 3 may not protrude from the first surface 111 in the third direction Z, and the second heat exchange plate 3 may not protrude from the third surface 113 in the third direction Z. For example, the second heat exchange plate 3 may be flush with the first surface 111 in the third direction Z, or the second heat exchange plate 3 may be recessed relative to the first surface 111 in the third direction Z; the second heat exchange plate 3 may be flush with the third surface 113 in the third direction Z, or the second heat exchange plate 3 may be recessed relative to the third surface 113 in the third direction Z.

[0059] This configuration avoids the second heat exchange plate 3 occupying additional space in the third direction Z, which is beneficial for the low-height design of the battery pack.

[0060] In some exemplary embodiments of this disclosure, reference is made to Figure 4 As shown, the two tabs 119 can be located one-to-one on both sides of the cell body 118 near the two second surfaces 112, that is, the two tabs 119 extend from the two sides of the cell body 118. The two tabs 119 can be connected one-to-one to the first terminal 115 and the second terminal 116 through two adapters. In this case, because the tabs 119 are close to the second surface 112, the second surface 112 will accumulate more heat. The heat of the tabs 119 can be dissipated by the second heat exchange plate 3. However, since the other second surface 112 is not provided with a second heat exchange plate 3, the two second surfaces 112 are more prone to temperature unevenness.

[0061] Therefore, the ratio of n to m can be set to be greater than or equal to 0.5 and less than or equal to 4.1. That is, the value of n needs to be reduced, which means reducing the width of the second heat exchange plate 3 along the third direction Z, reducing the heat dissipation effect of the second heat exchange plate 3, and thus reducing the temperature difference between the two second surfaces 112. The specific values ​​of the ratio of n to m have been illustrated above and will not be repeated here.

[0062] Optionally, the orthographic projection of the tab 119 on the second surface 112 overlaps with the orthographic projection of the second heat exchange plate 3 on the second surface 112. This can be achieved by the orthographic projection of the tab 119 on the second surface 112 being located within the orthographic projection of the second heat exchange plate 3 on the second surface 112. For example, the edge line of the orthographic projection of the tab 119 on the second surface 112 may coincide with the edge line of the orthographic projection of the second heat exchange plate 3 on the second surface 112. Alternatively, the orthographic projection of the second heat exchange plate 3 on the second surface 112 may cover and be larger than the orthographic projection of the tab 119 on the second surface 112. This allows the second heat exchange plate 3 to cover the entire area where the tab 119 is located, thus better dissipating heat from the tab 119. Alternatively, a portion of the orthographic projection of the tab 119 on the second surface 112 may overlap with a portion of the orthographic projection of the second heat exchange plate 3 on the second surface 112. Another option is that the orthographic projection of the second heat exchange plate 3 on the second surface 112 may cover and be larger than the orthographic projection of the tab 119 on the second surface 112.

[0063] In some exemplary embodiments of this disclosure, reference is made to Figure 2 As shown, the distance L between the first heat exchange plate 2 and the second heat exchange plate 3 along the second direction Y is less than or equal to 120mm. For example, the distance L between the first heat exchange plate 2 and the second heat exchange plate 3 along the second direction Y can be 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, etc.

[0064] If the distance L between the first heat exchange plate 2 and the second heat exchange plate 3 along the second direction Y is too large, the heat dissipation area of ​​the first heat exchange plate 2 to the first pole post 115 will be small, and the heat from the first surface 111 will spread to the second surface 112. The above-mentioned numerical range can minimize the spread of heat from the first surface 111 to the second surface 112.

[0065] Furthermore, since some heat from the first surface 111 will spread to the two second surfaces 112 on both sides, placing the second heat exchange plate 3 on one of the second surfaces 112 will make it easier for the two second surfaces 112 to have uneven heat dissipation. Therefore, the ratio of n to m should be set to be greater than or equal to 0.5 and less than or equal to 4.3, that is, the value of n needs to be reduced. In other words, the width of the second heat exchange plate 3 along the third direction Z should be reduced to reduce the heat dissipation effect of the second heat exchange plate 3 and reduce the temperature difference between the two second surfaces 112. The specific value of the ratio of n to m has been illustrated above and will not be repeated here.

[0066] In some exemplary embodiments of this disclosure, reference is made to Figure 1 and Figure 2As shown, the single cell 11 has a large surface 117, which is the surface with the largest area of ​​the single cell 11. Two adjacent single cells 11 have their large surfaces 117 close together and are stacked to form the battery pack 1. This makes it impossible to place the second heat exchange plate 3 on the large surface 117 of the single cell 11. Therefore, the area of ​​the second surface 112 where the second heat exchange plate 3 is placed is relatively small. Furthermore, the distance between the two second surfaces 112 along the second direction Y is relatively large, resulting in poor heat transfer between the two second surfaces 112. Therefore, the ratio of n to m is set to be greater than or equal to 0.5 and less than or equal to 4.3, meaning the value of n needs to be reduced. This reduces the width of the second heat exchange plate 3 along the third direction Z, thereby reducing the heat dissipation effect of the second heat exchange plate 3 and reducing the temperature difference between the two second surfaces 112. The specific values ​​of the ratio of n to m have been illustrated above and will not be repeated here.

[0067] In other exemplary embodiments of this disclosure, reference is made to Figure 5 As shown, the single cell 11 has a fourth surface 114, which is adjacent to the first surface 111 and is perpendicular to the first direction X. Specifically, there are two fourth surfaces 114, which are arranged opposite to each other along the first direction X. The two fourth surfaces 114 are alternately arranged with the two second surfaces 112 and then connected end to end to form a rectangular frame. The first surface 111 is located on one side of the rectangular frame, and the third surface 113 is located on the opposite side of the rectangular frame.

[0068] The area of ​​the fourth surface 114 is smaller than that of the second surface 112. The fourth surfaces 114 of two adjacent individual cells 11 are stacked close to each other to form a battery pack 1, so that a second heat exchange plate 3 is set on the second surface 112 with a larger area, and the contact area between the second heat exchange plate 3 and the second surface 112 is larger. Since the area of ​​the fourth surface 114 is smaller, the distance between the two second surfaces 112 is closer, and the heat transfer capacity between the two second surfaces 112 is better. The second heat exchange plate 3 can dissipate heat from the two second surfaces 112. Therefore, the ratio of n to m is set to be greater than or equal to 0.7 and less than or equal to 4.5, that is, the value of n can be appropriately increased. In other words, the width of the second heat exchange plate 3 along the third direction Z is appropriately increased so that the second heat exchange plate 3 can better dissipate heat from the two second surfaces 112. In this case, the distance between the two second surfaces 112 is relatively short. Therefore, the width m of the first heat exchange plate 2 along the second direction Y will be smaller. In this case, the extension direction of the first heat exchange plate 2 is perpendicular to the first direction X. Therefore, the second direction Y is the same as the first direction X, which makes the minimum value of the ratio of n to m larger. The specific values ​​of the ratio of n to m have been illustrated above and will not be repeated here.

[0069] In some exemplary embodiments of this disclosure, reference is made to Figure 1As shown, two battery packs 1 constitute one battery pack unit 10. A battery module may include one battery pack unit 10, or it may include two, three, or more battery pack units 10. Two battery packs 1 belonging to the same battery pack unit 10 share a second heat exchange plate 3. No second heat exchange plate 3 is provided between adjacent battery pack units 10. A single second heat exchange plate 3 can dissipate heat between the two battery packs 10 belonging to the same battery pack unit 10, effectively reducing the number of second heat exchange plates 3 used, thereby reducing the space occupied by the second heat exchange plates 3 and increasing energy density. However, this will cause a temperature difference between the two second surfaces 112. The above example embodiment is more suitable for this battery module.

[0070] In other example embodiments of this disclosure, reference is made to Figure 6 As shown, the battery module may also include a heat insulation pad 4, which is disposed on the side of the second heat exchange plate 3 away from the individual battery cell 11. A battery pack 1, a second heat exchange plate 3, and a heat insulation pad 4 constitute a battery pack unit 10. The battery pack unit 10 is configured to be at least two sets, that is, the battery module may include one battery pack unit 10, or two, three or more battery pack units 10. The heat insulation pad 4 can prevent one set of battery pack 1 from affecting another adjacent set of battery pack 1. At the same time, it also prevents the heat from another set of battery pack units 10 from affecting the second heat exchange plate 3 of the battery pack unit 10, thus reducing the heat dissipation capacity of the second heat exchange plate 3. Similarly, it will cause a temperature difference between the two second surfaces 112. The above example embodiment is more suitable for this battery module. The heat insulation pad 4 is generally made of a relatively soft material (e.g., rubber, foam, etc.) and has a certain amount of compressible space, which can leave room for the expansion of the battery after charging.

[0071] In some exemplary embodiments of this disclosure, the first heat exchange plate 2 and the second heat exchange plate 3 are liquid-cooled plates, meaning that heat exchange channels are provided within the first heat exchange plate 2 and the second heat exchange plate 3. When the battery pack 1 needs to be heated, a heat exchange medium with a higher temperature can be introduced into the heat exchange channels, and the heat of the heat exchange medium is transferred to the battery pack 1 to achieve heating of the battery pack 1; when the battery pack 1 needs to be cooled, a heat exchange medium with a lower temperature can be introduced into the heat exchange channels, and the heat of the battery pack 1 is transferred to the heat exchange medium to achieve cooling of the battery pack 1.

[0072] Based on the same inventive concept, the present disclosure provides a battery pack, which may include a battery module. The battery module is any of the battery modules described above. The specific structure of the battery module has been described in detail above, so it will not be repeated here.

[0073] In some exemplary embodiments of this disclosure, reference is made to Figure 1As shown, the battery pack may include a battery box 20, and the battery module is disposed inside the battery box 20. The battery pack may be configured as a cuboid structure, therefore, the battery box 20 may also be configured as a cuboid structure. Specifically, the battery box 20 may include a base plate, a protective cover (not shown in the figure), two first side frames 201, and two second side frames 202. The base plate and the protective cover may be rectangular. Two first side frames 201 and two second side frames 202 are provided around the base plate. The two first side frames 201 and two second side frames 202 are connected end to end to form a rectangular frame. The first side frames 201 extend along a first direction X, and the second side frames 202 extend along a second direction Y. A protective cover is provided on the opposite side of the two first side frames 201 and two second side frames 202 from the base plate, such that the protective cover is positioned opposite the base plate. The two first side frames 201 and two second side frames 202 are connected between the protective cover and the base plate. The base plate, protective cover, two first side frames 201 and two second side frames 202 surround and form the receiving cavity of the battery box 20.

[0074] Of course, in other exemplary embodiments of this disclosure, the base plate and protective cover can be circular, elliptical, trapezoidal, etc., and the side frame can be one or more, forming a circular, elliptical, trapezoidal, etc., shape, so that the battery box 20 is formed as a cylinder, elliptical cylinder, prism, etc. The battery box 20 body can also be other shapes, which will not be described in detail here. Moreover, the battery box 20 may not include a protective cover. For example, in the case of multiple battery devices stacked vertically, the battery device located at the bottom may not have a protective cover, and only the battery device located at the top has a protective cover. The base plate of the upper battery device can serve as the protective cover for the lower battery device.

[0075] The battery module and battery pack disclosed herein have several advantages. First, since the terminal post is where heat is concentrated in the individual battery cell 11, the first heat exchange plate 2 is located on the first surface 111, enabling the first heat exchange plate 2 to dissipate heat from the first surface 111, which is beneficial for the heat dissipation of the battery pack 1, effectively reducing the possibility of thermal runaway and ensuring the safety of the battery module and battery pack. Second, since the second surface 112 is adjacent to the first surface 111 where the first terminal post 115 is located, the second heat exchange plate 3 is located on one of the second surfaces 112, which can dissipate heat from the second surface 112, which is beneficial for the heat dissipation of the battery pack 1. Moreover, the second heat exchange plate 3 is only located on one of the second surfaces 112, which does not excessively occupy the space for arranging the individual batteries 11 in the battery module, which is beneficial for improving energy density. Furthermore, the ratio of n to m is greater than or equal to 0.5 and less than or equal to 4.5, which not only avoids excessive temperature difference between the two second surfaces 112, but also ensures that the second heat exchange plate 3 has a good cooling effect on one of the second surfaces 112, thus ensuring the safety of the battery module and battery pack.

[0076] The terms "parallel" and "perpendicular" used in this application can mean not only perfectly parallel and perpendicular, but also have a certain margin of error; for example, if the angle between the two is greater than or equal to 0° and less than or equal to 5°, they are considered to be parallel; if the angle between the two is greater than or equal to 85° and less than or equal to 95°, they are considered to be perpendicular.

[0077] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A battery module, characterized in that, include: A battery pack includes a plurality of individual cells arranged sequentially along a first direction. Each individual cell has a first surface and a second surface. A first electrode post is disposed on the first surface. The second surface is disposed adjacent to the first surface and parallel to the first direction. A first heat exchange plate is disposed on the first surface. The width of the first heat exchange plate along the second direction is m. The second direction is parallel to the first surface and perpendicular to the extension direction of the first heat exchange plate. A second heat exchange plate is disposed on a second surface. The width of the second heat exchange plate along a third direction is n, and the ratio of n to m is greater than or equal to 0.5 and less than or equal to 4.

5. The third direction is parallel to the second surface and perpendicular to the first direction.

2. The battery module according to claim 1, characterized in that, The first heat exchange plate is closer to the second surface where the second heat exchange plate is located than to the second surface where the second heat exchange plate is located.

3. The battery module according to claim 1, characterized in that, A second pole post is also provided on the first surface, and the first heat exchange plate is located between the first pole post and the second pole post.

4. The battery module according to claim 3, characterized in that, The distance between the first pole post and the second pole post along the second direction is m1, and the ratio of m to m1 is greater than or equal to 0.5 and less than 1.

5. The battery module according to claim 1, characterized in that, The single cell has a third surface, which is disposed opposite to the first surface. A second electrode post is disposed on the third surface. The first surface includes a first part and a second part, which are disposed on opposite sides of the first electrode post along the second direction. The size of the first part along the second direction is smaller than the size of the second part along the second direction. The first heat exchange plate is disposed on the second part. The first part is closer to the second heat exchange plate than the second part.

6. The battery module according to claim 1, characterized in that, The single cell has a third surface, which is disposed opposite to the first surface. The second heat exchange plate does not protrude from the first surface in the third direction, and the second heat exchange plate does not protrude from the third surface in the third direction.

7. The battery module according to claim 1, characterized in that, The single battery cell includes: Battery cell body; Two tabs are connected to the main body of the battery cell and are located on both sides of the main body of the battery cell near the two second surfaces; the ratio of n to m is greater than or equal to 0.5 and less than or equal to 4.

1.

8. The battery module according to claim 7, characterized in that, The orthographic projection of the tab on the second surface overlaps with the orthographic projection of the second heat exchange plate on the second surface.

9. The battery module according to claim 1, characterized in that, The distance between the first heat exchange plate and the second heat exchange plate along the second direction is less than or equal to 120 mm, and the ratio of n to m is greater than or equal to 0.5 and less than or equal to 4.

3.

10. The battery module according to claim 1, characterized in that, The individual battery has a large surface area, and two adjacent individual batteries are stacked close to each other to form the battery pack. The ratio of n to m is greater than or equal to 0.5 and less than or equal to 4.

3. Alternatively, the individual battery cell has a fourth surface, which is adjacent to the first surface and perpendicular to the first direction. The area of ​​the fourth surface is smaller than the area of ​​the second surface. The fourth surfaces of two adjacent individual batteries are stacked close to each other to form the battery pack. The ratio of n to m is greater than or equal to 0.7 and less than or equal to 4.

5.

11. The battery module according to claim 1, characterized in that, The two sets of battery packs constitute a battery pack unit, and the two sets of battery packs belonging to the same battery pack unit share a second heat exchange plate; Alternatively, the battery module may also include: A heat insulation pad is disposed on the side of the second heat exchange plate away from the single cell; a group of the battery pack, a second heat exchange plate and a heat insulation pad constitute a battery pack unit, and the battery pack unit is configured as at least two groups.

12. A battery pack, characterized in that, include: The battery module is the battery module as described in any one of claims 1 to 11.

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