Battery pack and electric device

Abstract

The utility model relates to battery technology field discloses a kind of battery pack and electrical equipment, battery pack includes: battery monomer, including shell, the area of one side of each face of shell is the first wall, and the side opposite to the first wall is the second wall, and the area of first wall is greater than second wall;Heat exchange plate, heat exchange plate is set to heat exchange with second wall, heat exchange channel is opened in heat exchange plate, the projection area of heat exchange channel towards second wall is S, unit is mm 2 , the area difference of first wall and second wall is ΔS, unit is mm 2 , satisfy: 10≤S / △S≤1200.The utility model provides battery pack, so that the heat dissipation efficiency of first wall and second wall tends to be balanced, it is favorable for the temperature difference of two wall surfaces to be similar, effectively reduce the temperature difference in cell inside.Furthermore, one group of heat exchange plates can be set between every two groups of battery monomers, reduce the quantity of heat exchange plate in battery pack, by reducing the space occupation of heat exchange plate.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack and electrical equipment. Background Technology

[0002] As the power source for electric vehicles and other devices, the performance of the battery pack directly affects the overall performance of the device. A battery pack typically consists of a housing and the batteries housed within it.

[0003] To ensure battery heat exchange efficiency, heat exchange plates are typically installed inside the battery pack housing to improve overall heat dissipation and reduce heat buildup. In related technologies, placing the heat exchange plates opposite the large surface area of ​​the battery increases the contact area and achieves better heat dissipation.

[0004] However, in related technologies, the heat exchange plate only contacts one side of the battery, resulting in a large difference in heat dissipation between the two surfaces of the battery. This leads to inconsistent temperature differences in different areas of the battery cell inside the battery casing, affecting cell consistency and resulting in poor battery cycle life. Utility Model Content

[0005] In view of this, the present invention provides a battery pack and electrical equipment to solve the problem of large differences in heat dissipation between the two surfaces of the battery.

[0006] In a first aspect, this utility model provides a battery pack, comprising:

[0007] A battery cell includes a casing. The side with the largest area among all the surfaces of the casing is the first wall surface, and the side opposite to the first wall surface is the second wall surface. The area of ​​the first wall surface is larger than that of the second wall surface.

[0008] A heat exchange plate is arranged opposite to the second wall for heat exchange. A heat exchange channel is formed within the heat exchange plate, and the projected area of ​​the heat exchange channel facing the second wall is S (in mm). 2 The area difference between the first wall and the second wall is ΔS, in mm. 2 The condition is satisfied that 10 ≤ S / △S ≤ 1200.

[0009] Beneficial Effects: The battery pack provided by the embodiments of this utility model, by making the area of ​​the first wall surface larger than that of the second wall surface, and by setting the heat exchange plate relative to the second wall surface for heat exchange, makes the heat dissipation efficiency of the first and second walls more balanced, which is beneficial to making the temperature difference between the two walls similar, effectively reducing the internal temperature difference of the battery cells, ensuring the overall heat exchange efficiency of the battery cells, and improving the overall heat exchange consistency of the battery cells. Furthermore, it is possible to set one heat exchange plate between every two sets of battery cells, reducing the number of heat exchange plates in the battery pack. By reducing the space occupied by the heat exchange plates, the overall structure of the battery pack is further optimized, space utilization is improved, manufacturing costs are reduced, and the overall performance and reliability of the battery pack are enhanced. When the formula value of S / ΔS is too large, the structural strength of the heat exchange plate is poor and it is easy to deform; while when the formula value of S / ΔS is too small, the heat exchange efficiency of the second wall surface is insufficient, which can easily lead to a large difference in heat exchange efficiency between the first and second walls, affecting the heat dissipation consistency of the battery cells, thus causing local overheating and shortening battery life. This embodiment ensures the structural strength of the heat exchange plate and prevents deformation by reasonably controlling the range of values ​​for the formula S / ΔS, while also ensuring balanced heat dissipation efficiency on both walls, effectively avoiding local overheating, extending battery life, and preventing performance degradation due to excessive or insufficient heat dissipation; thus achieving long-term stable operation of the battery pack.

[0010] Secondly, this utility model also provides an electrical device, comprising:

[0011] The electrical equipment itself, and the battery pack as described above;

[0012] The electrical equipment itself is electrically connected to the battery pack.

[0013] Since electrical equipment includes a battery pack, which has the same effect as a battery pack, it will not be elaborated on here. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the battery pack of this utility model;

[0016] Figure 2 This is an exploded view of the battery pack of this utility model;

[0017] Figure 3 This is an exploded view of the battery module of this utility model;

[0018] Figure 4 This is a schematic diagram of the housing of this utility model;

[0019] Figure 5 This is a cross-sectional view of the housing and battery cell of this utility model;

[0020] Figure 6 This is a cross-sectional view of the battery cell and heat exchange plate of this utility model in their mating state;

[0021] Figure 7 This is a cross-sectional view of the battery cell of this utility model in conjunction with another heat exchange plate;

[0022] Figure 8 This is a cross-sectional view of another heat exchange plate of this utility model;

[0023] Figure 9 This is a cross-sectional view of multiple battery modules stacked along the first direction according to the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Battery module; 10. Battery row; 100. Battery cell; 110. Housing; 111. First wall; 112. Second wall; 113. Bottom wall; 114. Receiving cavity; 120. Battery cell;

[0026] 20. Heat exchange plate; 201. Heat exchange flow channel; 2011. Main body flow channel; 2012. Support flow channel; 202. Main body; 203. Support;

[0027] 3. Heat exchange piping; 4. Housing; 41. Base plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] To ensure the heat exchange efficiency of the battery, heat exchange plates are usually installed to improve the overall heat dissipation performance of the battery pack and reduce heat accumulation.

[0033] In related technologies, heat exchange plates can be installed in various ways. For example, they can be laid at the bottom of the battery pack, making close contact with the battery through thermally conductive materials; alternatively, they can be installed on both sides of the battery pack to achieve side heat dissipation. In both of these methods, the heat exchange plate only contacts a portion of the surface of the battery cell, resulting in limited heat exchange efficiency.

[0034] To further improve heat exchange efficiency, heat exchange plates can be embedded inside the battery pack, with heat exchange plates placed between adjacent battery cells to form an alternating arrangement of battery cells and heat exchange plates, increasing the heat exchange area. By setting multiple sets of heat exchange plates, the heat exchange plates are brought into close contact with a large area of ​​the battery cells to ensure better heat dissipation.

[0035] However, while placing heat exchange plates between adjacent battery cells improves heat dissipation, it also results in the heat exchange plates occupying more space and increasing the overall weight of the battery pack. To reduce the space occupied by the heat exchange plates, one set of heat exchange plates can be placed between every two sets of battery cells, thus halving the number of heat exchange plates.

[0036] Although it can meet the heat exchange requirements, the heat exchange plate only contacts one side of the battery cell, which can easily lead to a large difference in heat dissipation between the two surfaces of the battery cell. This results in inconsistent temperature differences in different areas of the cell, which in turn affects the consistency of the cell and leads to poor cycle life of the battery cell.

[0037] The following is combined Figures 1 to 9 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, in one aspect, a battery pack is provided, comprising:

[0039] The battery cell 100 includes a housing 110. The side with the largest area among all the surfaces of the housing 110 is the first wall surface 111, and the side opposite to the first wall surface 111 is the second wall surface 112. The area of ​​the first wall surface 111 is larger than that of the second wall surface 112.

[0040] Heat exchange plate 20 is arranged opposite to the second wall surface 112 for heat exchange. Heat exchange channel 201 is formed inside the heat exchange plate 20. The projected area of ​​heat exchange channel 201 facing the second wall surface 112 is S, in mm. 2 The area difference between the first wall surface 111 and the second wall surface 112 is ΔS, in mm. 2 The condition is satisfied that 10 ≤ S / △S ≤ 1200.

[0041] The shell 110 can be formed by stamping or by welding.

[0042] The housing 110 has a cavity 114 inside, which is suitable for placing the battery cell 120.

[0043] The shell 110 can be in the shape of a quadrangular prism, a cylinder or other polyhedral shapes. In this embodiment, the shell 110 is preferably quadrangular prism, which is convenient for close arrangement in groups.

[0044] The surface with the largest area among all surfaces of the housing 110 is the first wall surface 111, and the surface opposite the first wall surface 111 is the second wall surface 112, with the area of ​​the first wall surface 111 being larger than that of the second wall surface 112. Since the battery cell 120 generates heat during operation, the material of the housing 110 needs to have high thermal conductivity, such as aluminum, copper, stainless steel, aluminum alloy, or copper alloy, to ensure rapid heat conduction. However, when the area of ​​the first wall surface 111 is larger than that of the second wall surface 112, the heat dissipation efficiency of the two walls will be uneven. The first wall surface 111, due to its larger area, has a wider heat dissipation area and higher heat dissipation efficiency; while the second wall surface 112, with its smaller area, has relatively lower heat dissipation efficiency, resulting in a higher temperature in the area of ​​the battery cell 120 near the second wall surface 112.

[0045] To compensate for this deficiency, a heat exchange plate 20 is provided, and the heat exchange plate 20 is arranged to exchange heat with the second wall surface 112. For example, the heat exchange plate 20 can be tightly attached to the second wall surface 112, or connected by a thermally conductive pad, to ensure efficient heat transfer and improve the heat dissipation efficiency of the second wall surface 112. This balances the overall temperature distribution of the battery cell 120, reduces temperature difference, and improves battery cell consistency and cycle life.

[0046] The battery pack provided in this embodiment of the present invention, by making the area of ​​the first wall surface 111 larger than that of the second wall surface 112, and by setting the heat exchange plate 20 to exchange heat with the second wall surface 112 relative to each other, makes the heat dissipation efficiency of the first wall surface 111 and the second wall surface 112 tend to be balanced. This is beneficial to making the temperature difference between the two walls similar, effectively reducing the internal temperature difference of the battery cell 120, ensuring the overall heat exchange efficiency of the battery cell 100, and improving the overall heat exchange consistency of the battery cell 100. Furthermore, it is possible to set one heat exchange plate 20 between every two sets of battery cells 100, reducing the number of heat exchange plates 20 in the battery pack. By reducing the space occupied by the heat exchange plates 20, the overall structure of the battery pack is further optimized, space utilization is improved, manufacturing costs are reduced, and the overall performance and reliability of the battery pack are enhanced.

[0047] In addition, a heat exchange channel 201 is provided inside the heat exchange plate 20. The heat exchange medium is suitable for flowing through the heat exchange channel 201. Through the circulation of the heat exchange medium in the heat exchange channel 201, the heat generated by the battery cell 120 is carried away, further enhancing the heat dissipation effect. The heat exchange medium can be selected from highly efficient thermally conductive liquids such as water and ethylene glycol, ensuring that heat is quickly transferred to the external environment, thereby maintaining the internal temperature of the battery pack and extending the battery life.

[0048] The more heat exchange channels 201 are opened, the larger the heat exchange area, and the more significant the heat dissipation effect. A reasonable design of the number and layout of channels can maximize heat transfer efficiency, further reduce cell temperature, and improve the overall heat dissipation performance of the battery pack. However, to ensure consistency in heat dissipation efficiency between the first wall 111 and the second wall 112, a larger opening area for the heat exchange channels 201 is not necessarily better.

[0049] This embodiment ensures balanced heat dissipation on both walls by controlling the ratio of S to ΔS within a reasonable range. This avoids uneven heat dissipation efficiency on the first wall 111 and the second wall 112 due to excessive heat dissipation, and also prevents local overheating caused by insufficient heat dissipation. As a result, a uniform temperature distribution inside the battery pack is achieved, ensuring stable operation and long-term reliability of the battery system.

[0050] The area difference between the first wall surface 111 and the second wall surface 112 is ΔS. A larger ΔS indicates a more significant difference in heat exchange efficiency between the two surfaces. In this case, the projected area S of the heat exchange channel 201 facing the second wall surface 112 should be appropriately increased to enhance its heat dissipation capacity and reduce the temperature difference between the two walls. However, if S is too large, the heat exchange channel 201 within the heat exchange plate 20 will occupy too much space, leading to a decrease in the structural strength of the heat exchange plate 20, making it prone to deformation and affecting overall stability.

[0051] When the formula value of S / △S is too large, the structural strength of the heat exchange plate 20 is poor and it is easy to deform; while when the formula value of S / △S is too small, the heat exchange efficiency of the second wall 112 is insufficient, which can easily lead to a large difference in heat exchange efficiency between the first wall 111 and the second wall 112, affecting the consistency of cell heat dissipation, and thus causing local overheating and shortening battery life.

[0052] Therefore, this embodiment ensures the structural strength of the heat exchange plate 20 and prevents deformation by reasonably controlling the range of values ​​for the formula S / △S; it also ensures that the heat dissipation efficiency of the two walls is balanced, effectively avoiding local overheating, extending battery life, and preventing performance degradation caused by excessive or insufficient heat dissipation; thus achieving long-term stable operation of the battery pack.

[0053] In this embodiment, the heat exchange plate 20 is parallel to the second wall surface 112.

[0054] For example, in this embodiment, the value of S / △S can be 10 or 15 or 50 or 100 or 150 or 260 or 370 or 410 or 500 or 610 or 750 or 850 or 920 or 1000 or 1125 or 1200, or it can be any range formed by any two of the above values.

[0055] In some embodiments, the area of ​​the first wall surface 111 is S1, in mm. 2 The area of ​​the second wall 112 is S2, in mm. 2 And △S=S1-S2, satisfying: 70≤S1-S2≤3800.

[0056] In some embodiments, combined with Figure 6 As shown, both the first wall surface 111 and the second wall surface 112 are perpendicular to the first direction;

[0057] The battery cell 100 also includes a bottom wall surface 113, which is disposed between the first wall surface 111 and the second wall surface 112 along a first direction. The bottom wall surface 113 is inclined relative to the bottom support plate 41 so that the bottom of the second wall surface 112 along a third direction is higher than the bottom of the first wall surface 111 along a third direction; wherein, the third direction is perpendicular to both the first direction and the second direction.

[0058] In this embodiment, the first direction can be the length direction of the battery pack, the second direction can be the width direction of the battery pack, and the third direction can be the direction perpendicular to the bottom support plate 41.

[0059] It should be noted that a receiving cavity 114 is formed inside the housing 110. The receiving cavity 114 is suitable for placing the battery cell 120 and also suitable for containing electrolyte. Figure 5 As shown, the housing 110 includes a first wall surface 111, a second wall surface 112, and a bottom wall surface 113 disposed between the two. Since the area of ​​the first wall surface 111 is larger than that of the second wall surface 112, the bottom wall surface 113 is designed to be inclined to compensate for the area difference in order to facilitate this structural design. After the battery cell 120 is placed in the receiving cavity 114, a certain gap is formed between its bottom and the bottom wall surface 113. Electrolyte tends to accumulate in this gap area. For battery cells of the same specifications and models, the amount of electrolyte injected into the battery cell 100 is constant, for example, 3 ml. Since the electrolyte will naturally flow to the lower end of the battery cell 100 under the action of gravity, the inclined design of the bottom wall surface 113 can reduce the volume of the gap area, causing less electrolyte to accumulate at the bottom of the housing 110 and more to fill other areas of the receiving cavity 114, ensuring uniform wetting of all parts of the battery cell and improving battery performance.

[0060] When the area of ​​the first wall 111 is larger than that of the second wall 112, the heat dissipation efficiency of the two walls will be uneven. The first wall 111 has a larger heat dissipation area and higher heat dissipation efficiency due to its larger area. The second wall 112 has a smaller area and relatively lower heat dissipation efficiency, resulting in a higher temperature in the area of ​​the battery cell 120 near the second wall 112.

[0061] However, due to the area difference between the first wall surface 111 and the second wall surface 112, that is, the bottom wall surface 113 has an inclined design, the accumulation of electrolyte at the bottom can be reduced, the uniformity of cell wetting can be improved, and the internal heat distribution of the battery can be further optimized.

[0062] When the difference between S1 and S2 is too large, the heat dissipation difference between the two walls is too large, the cell consistency is poor, and the cycle life of the battery is short. When the difference between S1 and S2 is too small, it is easy to cause a large gap area between the bottom of the cell 120 and the bottom wall 113, the problem of electrolyte accumulation still exists, and it is easy to cause a large amount of electrolyte residue and poor cell wetting effect.

[0063] This embodiment ensures that the area difference ΔS between S1 and S2 is within a reasonable range by reasonably selecting the area difference between S1 and S2. On the one hand, it avoids excessive heat dissipation differences from affecting cell consistency, and on the other hand, it reduces electrolyte accumulation and improves cell wetting uniformity, thereby optimizing the overall battery performance and extending service life.

[0064] For example, in this embodiment, the values ​​of S1-S2 can be 70 or 100 or 150 or 260 or 370 or 410 or 500 or 610 or 750 or 850 or 920 or 1000 or 1125 or 1200 or 1500 or 1750 or 1900 or 2100 or 2500 or 3800, etc., or they can be any range formed by any two of the above values.

[0065] In some embodiments, the projected area S of the heat exchange channel 201 toward the second wall surface 112 satisfies the following range: 3800≤S≤110000, in mm. 2 .

[0066] When the projected area S of the heat exchange channel 201 toward the second wall 112 is too large, the heat exchange plate 20 has poor structural strength and is prone to deformation; while when S is too small, the heat exchange efficiency is insufficient and the heat exchange effect is poor, which in turn leads to poor battery temperature uniformity and easily shortens the cell cycle life.

[0067] This embodiment ensures that the projected area S of the heat exchange channel 201 is within a suitable range by reasonably controlling it. This not only effectively improves the heat exchange efficiency and prevents the battery cell from overheating, but also avoids insufficient structural strength of the heat exchange plate due to an excessively large area S, thus preventing deformation.

[0068] For example, in this embodiment, the value of S can be 3800 or 5900 or 7500 or 9100 or 15000 or 35000 or 110000, or it can be any range formed by any two of the above values.

[0069] In some embodiments, combined with Figure 2 As shown, the battery pack also includes:

[0070] The housing 4 includes a base plate 41 adapted to support the battery cell 100;

[0071] Combination Figure 6 As shown, multiple heat exchange channels 201 are provided in the heat exchange plate 20 along the direction perpendicular to the bottom support plate 41, and S is the sum of the projected areas of the multiple heat exchange channels 201 toward the second wall surface 112.

[0072] In this embodiment, the direction perpendicular to the bottom support plate 41 is also... Figure 6 The third party shown.

[0073] By setting multiple heat exchange channels 201 in the heat exchange plate 20 and reasonably distributing their projected area S towards the second wall surface 112, not only is the heat exchange efficiency enhanced, but the structural stability of the heat exchange plate 20 is also improved. This allows the connection structure between adjacent heat exchange channels 201 to act as a reinforcing rib, effectively preventing the heat exchange plate from deforming.

[0074] In some embodiments, among the plurality of heat exchange channels 201, the projected area of ​​the heat exchange channel 201 on the side closer to the bottom plate 41 toward the second wall 112 is SA1, and the projected area of ​​the heat exchange channel 201 on the side farther from the bottom plate 41 toward the second wall 112 is SA2, and the following condition is met: SA1 > SA2.

[0075] Combination Figure 6 As shown, since the area of ​​the first wall 111 is larger than that of the second wall 112, and the area of ​​the second wall 112 compared to the first wall 111 is mainly concentrated in the part near the bottom wall 113, that is, the part of the second wall 112 near the bottom wall 113 has the worst heat dissipation effect in the entire battery cell.

[0076] This embodiment makes SA1 greater than SA2, thereby providing more heat dissipation area in the region near the bottom wall 113, resulting in better heat dissipation in the region near the bottom wall 113. It prioritizes bottom heat dissipation, compensates for insufficient heat dissipation in this region, ensures overall temperature balance, and further improves battery performance and lifespan.

[0077] In some embodiments, combined with Figure 3 As shown, the battery pack also includes:

[0078] The housing 4 includes a base plate 41 adapted to support the battery cell 100;

[0079] At least one set of battery modules 1, the battery module 1 includes two rows of battery columns 10 stacked along a first direction and a heat exchange plate 20 disposed between the two rows of battery columns 10; the battery column 10 is composed of a plurality of battery cells 100 arranged along a second direction, both the first direction and the second direction are parallel to the plane where the base plate 41 is located, and the first direction is perpendicular to the second direction.

[0080] The extension direction of the heat exchange plate 20 is parallel to the second direction.

[0081] The battery array 10 includes multiple battery cells 100 arranged along the second direction, and the extension direction of the heat exchange plate 20 is parallel to the second direction, so that the heat exchange plate 20 can cover more battery cells 100 and exchange heat with multiple battery cells 100 at the same time, thereby improving the overall heat exchange efficiency.

[0082] By setting a heat exchange plate 20 between two rows of battery cells 10, the two rows of battery cells 10 can share a single heat exchange plate, reducing material usage, optimizing space layout, and ensuring heat exchange effect.

[0083] In some embodiments, in the two battery rows 10, the second wall 112 of a plurality of battery cells 100 are all disposed facing the heat exchange plate 20.

[0084] The second wall 112 of the battery cells 100 in one row of battery packs 10 faces the heat exchange plate 20, and the second wall 112 of the battery cells 100 in the other row of battery packs 10 also faces the heat exchange plate 20, forming a symmetrical structure, which enhances heat exchange uniformity, reduces temperature difference, further improves the overall thermal management performance of the battery pack, and extends its service life.

[0085] In some embodiments, the base plate 41 is bonded or welded to the heat exchange plate 20.

[0086] In some embodiments, the heat exchange plate 20 is provided with a heat exchange medium inlet and an outlet at both ends along the second direction, respectively, to ensure that the heat exchange medium circulates efficiently within the heat exchange plate 20, uniformly removes heat, and further improves heat exchange efficiency. Combined with Figure 2 As shown, the battery pack also includes a heat exchange pipeline 3. The heat exchange medium inlet and outlet are located at both ends of the heat exchange plate 20, respectively. The heat exchange pipeline 3 forms a closed loop system by connecting the heat exchange medium inlet and outlet, ensuring that the heat exchange medium flows uniformly in the heat exchange plate 20, efficiently removing heat, further optimizing the thermal management effect of the battery pack, and improving the overall performance and stability.

[0087] In some embodiments, combined with Figure 7 , Figure 8 As shown, the heat exchange plate 20 is a T-shaped plate, which includes a main body 202 and a support 203. The main body 202 is parallel to a third direction, and the support 203 is perpendicular to the main body 202. The support 203 is at least partially located between the bottom wall surface 113 and the bottom support plate 41.

[0088] Both the main body 202 and the support 203 are provided with heat exchange channels 201. Specifically, the heat exchange channels 201 include a main body channel 2011 formed in the main body 202 and a support channel 2012 formed in the support 203.

[0089] Because the bottom wall surface 113 is inclined relative to the bottom support plate 41, the bottom wall surface 113 of the battery cell 100 cannot be completely attached to the bottom support plate 41. On the one hand, this results in the inability to form a good support between the bottom wall surface 113 and the bottom support plate 41, leading to a decrease in the stability of the battery module. On the other hand, the inclined design increases the gap between the bottom wall surface 113 and the bottom support plate 41, resulting in a reduction in the heat dissipation area and affecting the heat dissipation efficiency.

[0090] In this embodiment, the heat exchange plate 20 is set as a T-shaped plate, and the support part 203 of the T-shaped plate is embedded between the bottom wall surface 113 and the bottom support plate 41, which effectively fills the gap, enhances the support stability, expands the heat dissipation contact area, improves heat dissipation efficiency, and ensures that the battery module can still maintain excellent thermal management performance when operating under high load.

[0091] The T-shaped plate design not only optimizes the heat dissipation path, but also reduces structural stress caused by tilting through the embedded support 203, further improving the mechanical strength and durability of the battery module.

[0092] In addition, heat exchange channels 201 are provided in both the main body 202 and the support 203, so that the bottom wall surface 113 of the battery cell 100 also has good heat dissipation performance.

[0093] As a variation, the bottom wall surface 113 can also be non-planar.

[0094] The bottom wall surface 113 has a non-planar structure, such as a wave-shaped, arc-shaped, or stepped shape. By using a non-planar design, the volume of the gap area between the bottom of the cell 120 and the bottom wall surface 113 is reduced, resulting in less electrolyte accumulation at the bottom of the casing and more electrolyte filling other areas of the receiving cavity 114, ensuring uniform wetting of all parts of the cell and improving battery performance.

[0095] Taking the stepped bottom wall 113 as an example, the bottom wall 113 includes a first stepped section and a second stepped section, which are staggered. The first stepped section is located at the lower position of the bottom wall 113, and the second stepped section is located at the higher position, forming a staggered structure. On the one hand, this creates a height difference, thereby optimizing the electrolyte distribution, reducing accumulation at the bottom, improving the uniformity of cell wetting, and enhancing the overall performance and stability of the battery. On the other hand, it allows at least a portion of the bottom wall 113 to support the bottom support plate 41, further improving the structural stability and ease of installation of the battery cell. Furthermore, when the heat exchange plate 20 is set as a T-shaped plate, the support portion 203 of the T-shaped plate fits more tightly with the stepped structure, further filling the gaps between the steps, strengthening the support effect, and optimizing the heat dissipation path to ensure effective heat dissipation in each stepped area.

[0096] Additionally, the staggered design acts as a reinforcing rib, effectively increasing the structural strength of the bottom wall 113 and improving the casing's protection of the battery cell. Furthermore, the staggered structure facilitates heat conduction, optimizes heat dissipation, and extends battery life. The bottom wall 113 adopts a stepped form, which can be achieved through injection molding or die casting processes during the integral molding of the casing 110, simplifying processing and reducing production costs.

[0097] In some embodiments, along a third direction, the projection of the bottom wall surface 113 onto the support 203 at least partially overlaps with the support flow channel 2012, and this overlapping area is defined as a first overlapping area.

[0098] The dimension of the first overlapping region along the first direction is C, in mm, and satisfies: 1≤C≤20.

[0099] By ensuring that the projection of the bottom wall surface 113 onto the support portion 203 at least partially overlaps with the support portion flow channel 2012, the heat exchange flow channel 201 can more efficiently absorb heat from the bottom wall surface 113, further improving heat dissipation efficiency. By limiting the dimension C of the first overlapping area along the first direction, sufficient heat exchange area between the heat exchange flow channel 201 and the bottom wall surface 113 can be ensured, thereby effectively improving heat dissipation efficiency. If C is too small, the contact area between the heat exchange flow channel 201 and the bottom wall surface 113 will decrease, reducing heat dissipation capacity; if C is too large, it may easily lead to structural interference or increase manufacturing difficulty, affecting assembly accuracy.

[0100] For example, in this embodiment, the value of C can be 1, 2, 3, 5, 8, 10, 12, 15, 18, or 20, or it can be a range formed by any two of the above values.

[0101] In some embodiments, the support portion 203 does not protrude beyond the lowest end of the bottom wall surface 113 in a third direction.

[0102] This design prevents the support portion 203 from protruding beyond the lowest point of the bottom wall surface 113 in a third-order direction, thus preventing assembly difficulties or structural interference caused by the protruding portion, while ensuring the overall flatness and stability of the bottom of the casing. It also reduces the space occupied at the bottom and improves the compactness of the overall battery pack layout.

[0103] As a variation, in some other embodiments, the support portion 203 protrudes in the third direction from the lowest end of the bottom wall surface 113.

[0104] By making the support portion 203 protrude from the lowest end of the bottom wall surface 113 in a third direction, the support portion 203 can preferentially contact the bottom support plate 41 during assembly, thereby achieving the pre-positioning function and improving assembly efficiency and accuracy. At the same time, the protruding support portion 203 can act as a buffer when the battery pack is subjected to external impact, further protecting the safety of the battery cells.

[0105] In some embodiments, the dimension of the support portion 203 protruding from the bottom wall surface 113 in the third direction is D, in mm, and satisfies: 0 < D ≤ 3.

[0106] The dimension D of the support part 203 protruding from the bottom wall surface 113 is limited to no more than 3mm. This ensures that the support part 203 has sufficient pre-positioning effect and buffering function, while avoiding structural interference or assembly inconvenience caused by excessive protrusion.

[0107] In some embodiments, the base plate 41 is provided with a recess for accommodating the support portion 203.

[0108] The recessed portion is designed to fit the support portion 203, thereby achieving precise positioning during assembly and improving the stability and assembly accuracy of the overall structure. Simultaneously, the recessed portion can accommodate the support portion 203, preventing deformation or damage due to external forces during transportation or use, thus improving the reliability and lifespan of the battery pack.

[0109] In some embodiments, thermally conductive adhesive is filled between the heat exchange plate 20 and the second wall surface 112.

[0110] The thermally conductive adhesive can be either polyurethane thermally conductive adhesive or modified silicone.

[0111] By filling the space between the heat exchange plate 20 and the second wall surface 112 with thermally conductive adhesive, heat transfer efficiency is enhanced, heat exchange stability is ensured, heat is rapidly and evenly distributed, and heat dissipation performance is further improved. The filling with thermally conductive adhesive also serves as a seal, preventing dust and impurities from entering, ensuring a clean internal environment for the battery, and extending its service life.

[0112] According to an embodiment of the present invention, another aspect provides an electrical appliance, comprising:

[0113] The electrical equipment itself, and the battery pack as described above;

[0114] The electrical equipment itself is electrically connected to the battery pack.

[0115] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A battery pack, characterized in that, include: A battery cell (100) includes a housing (110), wherein the side with the largest area among all the surfaces of the housing (110) is a first wall surface (111), and the side opposite to the first wall surface (111) is a second wall surface (112), and the area of ​​the first wall surface (111) is larger than that of the second wall surface (112). A heat exchange plate (20) is provided, which is arranged to exchange heat with the second wall surface (112). A heat exchange channel (201) is provided in the heat exchange plate (20). The projected area of ​​the heat exchange channel (201) facing the second wall surface (112) is S, in mm. 2 The area difference between the first wall surface (111) and the second wall surface (112) is ΔS, in mm. 2 The condition is satisfied that 10 ≤ S / △S ≤ 1200.

2. The battery pack according to claim 1, characterized in that, The area of ​​the first wall surface (111) is S1, in mm. 2 The area of ​​the second wall surface (112) is S2, in mm. 2 And △S=S1-S2, satisfying: 70≤S1-S2≤3800.

3. The battery pack according to claim 1, characterized in that, The projected area S of the heat exchange channel (201) toward the second wall surface (112) satisfies the following range: 3800≤S≤110000, in mm. 2 .

4. The battery pack according to claim 1, characterized in that, The battery pack also includes: The housing (4) includes a base plate (41) adapted to support the battery cell (100); Along a direction perpendicular to the bottom support plate (41), a plurality of heat exchange channels (201) are provided in the heat exchange plate (20), and S is the sum of the projected areas of the plurality of heat exchange channels (201) toward the second wall surface (112).

5. The battery pack according to claim 4, characterized in that, Among the multiple heat exchange channels (201), the projected area of ​​the heat exchange channel (201) closer to the bottom plate (41) toward the second wall surface (112) is SA1, and the projected area of ​​the heat exchange channel (201) farther away from the bottom plate (41) toward the second wall surface (112) is SA2, and the following condition is met: SA1 > SA2.

6. The battery pack according to claim 1, characterized in that, The battery pack also includes: The housing (4) includes a base plate (41) adapted to support the battery cell (100); At least one battery module (1), the battery module (1) includes two rows of battery columns (10) stacked along a first direction and a heat exchange plate (20) disposed between the two rows of battery columns (10); the battery column (10) is composed of a plurality of battery cells (100) arranged along a second direction, the first direction and the second direction are both parallel to the plane of the base plate (41), and the first direction is perpendicular to the second direction; The extension direction of the heat exchange plate (20) is parallel to the second direction.

7. The battery pack according to claim 6, characterized in that, In the two rows of battery columns (10), the second wall surface (112) of a plurality of battery cells (100) is disposed facing the heat exchange plate (20).

8. The battery pack according to claim 6, characterized in that, The bottom support plate (41) is bonded or welded to the heat exchange plate (20).

9. The battery pack according to claim 6, characterized in that, The first wall surface (111) and the second wall surface (112) are both perpendicular to the first direction; The battery cell (100) further includes a bottom wall surface (113), which is disposed between the first wall surface (111) and the second wall surface (112) along the first direction. The bottom wall surface (113) is inclined relative to the bottom support plate (41) so that the bottom of the second wall surface (112) along the third direction is higher than the bottom of the first wall surface (111) along the third direction. The third direction is perpendicular to both the first direction and the second direction.

10. The battery pack according to claim 9, characterized in that, The heat exchange plate (20) is a T-shaped plate, which includes a main body (202) and a support (203). The main body (202) is parallel to the third direction, and the support (203) is perpendicular to the main body (202). The support (203) is at least partially located between the bottom wall surface (113) and the bottom support plate (41). The heat exchange channel (201) includes a main body channel (2011) formed in the main body (202) and a support channel (2012) formed in the support (203).

11. The battery pack according to claim 10, characterized in that, Along the third direction, the projection of the bottom wall surface (113) onto the support (203) at least partially overlaps with the flow channel (2012) of the support, and this overlapping area is defined as the first overlapping area; The dimension of the first overlapping region along the first direction is C, in mm, and satisfies: 1≤C≤20.

12. The battery pack according to claim 10, characterized in that, The support (203) does not protrude beyond the lowest end of the bottom wall surface (113) in the third direction.

13. The battery pack according to claim 10, characterized in that, The support (203) protrudes upward from the lowest end of the bottom wall surface (113) on the third side.

14. The battery pack according to claim 13, characterized in that, The dimension of the support part (203) protruding from the bottom wall surface (113) in the third direction is D, in mm, and satisfies: 0 < D ≤ 3.

15. The battery pack according to claim 13, characterized in that, The bottom plate (41) is provided with a recess to accommodate the support part (203).

16. The battery pack according to any one of claims 1 to 15, characterized in that, Thermally conductive adhesive is filled between the heat exchange plate (20) and the second wall surface (112).

17. An electrical appliance, characterized in that, include: The electrical equipment body, and the battery pack as described in any one of claims 1 to 16 above; The electrical equipment body is electrically connected to the battery pack.

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