Battery packs and energy storage systems

Abstract

This utility model relates to the field of energy storage technology, and discloses a battery pack and energy storage system. The battery pack includes multiple battery cells arranged sequentially along a first direction. A heat exchange plate is disposed on one side of each battery cell along a second direction, with the first and second directions perpendicular to each other. The battery pack also includes cable ties for securing the battery cells and is wrapped around the heat exchange plate on the side away from the battery cells. A reinforcing rib is disposed on the side of the heat exchange plate away from the battery cells, extending in the same direction as the cable ties. The projection of the reinforcing rib onto the heat exchange plate at least partially overlaps with the projection of the cable ties onto the heat exchange plate. The battery pack of this utility model is smaller, lighter, lower in cost, and more reliable in use. The energy storage system equipped with the above-mentioned battery pack has higher energy density and lower cost, resulting in better economic benefits; at the same time, it has better thermal management and is safer to use.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a battery pack and energy storage system. Background Technology

[0002] Securing multiple battery cells with a casing (such as a metal or plastic shell) is a common method for battery pack mounting, but this method has some inherent drawbacks. First, the casing, to ensure strength, usually has a certain thickness, leading to increased weight and volume. Simultaneously, the casing needs to accommodate assembly gaps, fixing structures (such as screw holes and clips), and cushioning material space, resulting in a decrease in the actual volume occupied by the battery cells, indirectly reducing energy density (energy stored per unit volume / weight). Second, as a closed or semi-closed structure, the casing may hinder the dissipation of heat generated by the battery cells during operation, leading to excessively high local temperatures, affecting battery life, and even causing thermal runaway. Third, battery cells undergo slight expansion during charging and discharging due to chemical reactions (e.g., the expansion rate of lithium iron phosphate batteries is about 2%-5%), and rigid casings (especially metal ones) have poor deformation capacity and cannot absorb this volume change. This may cause compressive stress between the battery cells and the casing, potentially leading to casing deformation, loosening of connections, and other problems over time, affecting the overall structural stability.

[0003] Therefore, there is an urgent need for a battery pack and energy storage system to solve the above problems. Utility Model Content

[0004] Based on the above, one of the objectives of this utility model is to provide a battery pack that is smaller in size, lighter in weight, lower in cost, and more reliable in use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A battery pack includes a plurality of battery cells arranged sequentially along a first direction, and a heat exchange plate is provided on one side of the plurality of battery cells along a second direction, wherein the first direction is perpendicular to the second direction.

[0007] The battery pack also includes cable ties for securing multiple battery cells and are wrapped around the heat exchange plate on the side away from the multiple battery cells. The side of the heat exchange plate away from the battery cells is provided with reinforcing ribs in the same direction as the extension of the cable ties, and the projection of the reinforcing ribs on the heat exchange plate at least partially overlaps with the projection of the cable ties on the heat exchange plate.

[0008] The beneficial effects of the above technical solution are as follows:

[0009] The battery pack of this invention includes multiple battery cells along a first direction, and a heat exchange plate is provided on one side of each battery cell along a second direction. The heat exchange plate is used to cool the multiple battery cells, thereby achieving thermal management of the battery pack and effectively preventing overheating of the battery cells during operation, reducing the risk of thermal runaway. Simultaneously, the battery pack integrates the multiple battery cells and the heat exchange plate by cable ties. Compared to the casing, the cable ties have advantages such as smaller size, lighter weight, lower cost, and better heat dissipation. Specifically, the side of the heat exchange plate away from the battery cells has reinforcing ribs in the same direction as the cable ties, improving the structural strength of the heat exchange plate along the cable ties' extension direction. In addition, the projection of the reinforcing rib on the heat exchange plate at least partially overlaps with the projection of the cable tie on the heat exchange plate. This means that when the battery cell expands thermally and the cable tie tightens further, the structure near the reinforcing rib has the highest strength and can more effectively resist the tightening force of the cable tie. This reduces the risk of the heat exchange plate deforming due to the cable tie binding, ensuring that the heat exchange plate can be used for cooling normally and ensuring the overall safety of the battery pack, making the battery pack more reliable in use.

[0010] The second objective of this invention is to provide an energy storage system with higher energy density, higher economic benefits, and safer operation.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] An energy storage system, comprising a frame and multiple battery packs disposed on the frame as described above.

[0013] The beneficial effects of the above technical solution are as follows:

[0014] The energy storage system of this invention is equipped with the aforementioned battery pack, which results in higher overall energy density and lower cost, thus leading to better economic benefits. In addition, the energy storage system equipped with the aforementioned battery pack has better thermal management and is safer to use. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a battery pack provided in a specific embodiment of the present invention;

[0017] Figure 2This is a schematic diagram of the battery pack provided in a specific embodiment of the present invention from another perspective;

[0018] Figure 3 yes Figure 2 A partial schematic diagram of the cross-section at point AA in the middle;

[0019] Figure 4 This is a bottom view of the battery pack heat exchange plate provided in a specific embodiment of the present invention, which has another type of reinforcing rib.

[0020] Figure 5 This is a bottom view of the battery pack provided in a specific embodiment of this utility model;

[0021] Figure 6 This is a schematic diagram of the energy storage system provided in a specific embodiment of this utility model.

[0022] In the picture:

[0023] 100. Battery cell;

[0024] 200. Heat exchange plate; 210. Reinforcing rib; 211. Fitting section; 212. Reinforcing section; 220. Cooling channel; 221. Water inlet; 222. Water outlet;

[0025] 300. Cable ties;

[0026] 400, end plate;

[0027] 500. Frame;

[0028] 600, battery pack. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] 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" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0031] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between 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.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1-5 As shown, this embodiment provides a battery pack 600, which includes a plurality of battery cells 100 arranged sequentially along a first direction. The plurality of battery cells 100 have similar capacity and internal resistance, and are connected in series or in parallel to form the battery pack 600. The battery pack 600 can be applied to an energy storage system to perform functions such as energy storage, release, and optimization of power system operation.

[0035] A heat exchange plate 200 is provided on one side of a plurality of battery cells 100 along a second direction, and the first direction is perpendicular to the second direction; the battery pack 600 also includes a cable tie 300, which is used to bind the plurality of battery cells 100 and is wrapped around the side of the heat exchange plate 200 away from the plurality of battery cells 100; a reinforcing rib 210 is provided on the side of the heat exchange plate 200 away from the battery cells 100, which extends in the same direction as the cable tie 300, and the projection of the reinforcing rib 210 on the heat exchange plate 200 at least partially overlaps with the projection of the cable tie 300 on the heat exchange plate 200.

[0036] The battery pack 600 includes multiple battery cells 100 along a first direction, and a heat exchange plate 200 is provided on one side of each battery cell 100 along a second direction. The heat exchange plate 200 is used to cool the multiple battery cells 100, thereby achieving thermal management of the battery pack 600 and effectively preventing overheating of the battery cells 100 during operation, reducing the risk of thermal runaway. Simultaneously, the battery pack 600 is integrated by using cable ties 300 to bind the multiple battery cells 100 and the multiple battery cells 100 to the heat exchange plate 200. Compared to the housing, the cable ties 300 have advantages such as smaller size, lighter weight, lower cost, and better heat dissipation. Specifically, the side of the heat exchange plate 200 away from the battery cells 100 is provided with reinforcing ribs 210 in the same direction as the extension of the cable ties 300, improving the structural strength of the heat exchange plate 200 along the extension direction of the cable ties 300. In addition, the projection of the reinforcing rib 210 on the heat exchange plate 200 at least partially overlaps with the projection of the cable tie 300 on the heat exchange plate 200. This means that when the battery cell 100 expands thermally and the cable tie 300 tightens further, the structure near the reinforcing rib 210 has the highest strength and can more effectively resist the tightening force of the cable tie 300. This reduces the risk of the heat exchange plate 200 deforming due to the cable tie 300 binding it, ensuring that the heat exchange plate 200 can be used normally for cooling and ensuring the overall safety of the battery pack 600, making the use of the battery pack 600 more reliable.

[0037] It is worth noting that the first direction extends horizontally, while the second direction is vertical. Optionally, the heat exchange plate 200 is disposed below the plurality of battery cells 100, meaning that the heat exchange plate 200 not only cools the plurality of battery cells 100 but also supports them. Simultaneously, each battery cell 100 has an electrode post at one end along a third direction, which extends horizontally and is perpendicular to both the first and second directions. Cable ties 300 surround the plurality of battery cells 100 and the heat exchange plate 200 along the vertical plane containing the first and second directions, and the projection of the cable ties 300 onto the heat exchange plate 200 extends along the first direction. Correspondingly, the reinforcing ribs 210 also extend along the first direction.

[0038] like Figure 6 As shown, this embodiment also provides an energy storage system, including a frame 500 and multiple battery packs 600 as described in any of the above embodiments, disposed on the frame 500. The frame 500 is used to support and integrate the multiple battery packs 600. The energy storage system equipped with the aforementioned battery packs 600 has higher overall energy density and lower cost, resulting in better economic benefits; furthermore, the energy storage system equipped with the aforementioned battery packs 600 has better thermal management and is safer to use.

[0039] In this embodiment, as Figure 2 and Figure 3As shown, the reinforcing rib 210 protrudes towards the battery cell 100. Since the reinforcing rib 210 is recessed relative to the surface of the heat exchange plate 200 away from the battery cell 100, when the cable tie 300 is wrapped around the outside of the heat exchange plate 200, the reinforcing rib 210 will not interfere with the cable tie 300. This ensures the reinforcement effect on the heat exchange plate 200 without increasing the volume of the battery pack 600 or the length of the cable tie 300, which is beneficial for improving energy density and reducing costs.

[0040] For example, the distance H between the reinforcing rib 210 and the side of the heat exchange plate 200 away from the battery cell 100 is 3mm ≤ H ≤ 5mm. If the distance is too small, the reinforcing effect of the reinforcing rib 210 on the heat exchange plate 200 is too small. If the distance is too large, the reinforcing rib 210 occupies too much space in the cooling channel 220 within the heat exchange plate 200, resulting in a poorer cooling effect of the heat exchange plate 200 on the battery cell 100. Preferably, 3.9mm ≤ H ≤ 4.1mm is used to ensure a good reinforcing effect of the reinforcing rib 210 and sufficient space for the cooling channel 220. More preferably, H is set to 4mm. Of course, in other embodiments, H can also be set to 3mm, 3.3mm, 3.6mm, 4.3mm, 4.6mm, 5mm, etc., and is not specifically limited here.

[0041] As an optional configuration for the battery pack 600, the distance L between the end of the reinforcing rib 210 extending along the cable tie 300 and the end of the adjacent battery pack 600 extending along the cable tie 300 is 40mm ≤ L ≤ 45mm. That is, the distance between one end of the reinforcing rib 210 along the first direction and the corresponding edge of the battery pack 600 satisfies a value not greater than 40mm and not less than 45mm. If the distance is set too small, the contact distance between the cable tie 300 and the heat exchange plate 200 is too small, resulting in insufficient tightening force and poor tightening effect. If the distance is set too large, the length of the reinforcing rib 210 along the first direction will be shorter, thereby reducing the reinforcing effect of the reinforcing rib 210 on the heat exchange plate 200. Therefore, after the battery cell 100 deforms due to heat, the risk of the heat exchange plate 200 deforming due to being bound by the cable tie 300 increases. Preferably, 44mm ≤ L ≤ 44.5mm to ensure that the cable tie 300 has reliable tightening force and reliable reinforcing effect of the reinforcing rib 210. Of course, in other embodiments, L can also be set to 40mm, 40.5mm, 41mm, 41.5mm, 42mm, 42.5mm, 43mm, 43.5mm, etc., and no specific limitation is made here.

[0042] It is worth noting that the distances between the two ends of the reinforcing rib 210 along the first direction and the corresponding edges of the battery pack 600 along the first direction are the same. When the aforementioned distances between the two ends of the reinforcing rib 210 are set to be the same, the reinforcing effect of the two ends of the reinforcing rib 210 along the first direction on the heat exchange plate 200 is more similar, and at the same time, the contact lengths between the cable tie 300 and the heat exchange plate 200 along the first direction are also more similar, thereby making the stress on the heat exchange plate 200 and the cable tie 300 more uniform. Of course, those skilled in the art can also set the aforementioned distances between the two ends of the reinforcing rib 210 to be different according to actual needs, and no specific limitation is made here.

[0043] In this embodiment, as Figure 4 As shown, the reinforcing rib 210 includes a mating section 211 and a reinforcing section 212 extending along a first direction, and the mating section 211 and the reinforcing section 212 are arranged sequentially along a direction perpendicular to the cable tie 300. The direction perpendicular to the cable tie 300 is the third direction. Specifically, the distance between the end of the mating section 211 and the end of the adjacent battery pack 600 along the direction of extension of the cable tie 300 is L1, and the distance between the end of the reinforcing section 212 and the end of the adjacent battery pack 600 along the direction of extension of the cable tie 300 is L2, where L1 is less than L2. It can be understood that the mating section 211 is farther from the edge of the battery pack 600 than the reinforcing section 212. Therefore, by overlapping the projection of the mating section 211 on the heat exchange plate 200 with the projection of the cable tie 300 on the heat exchange plate 200, the impact of the small contact distance between the cable tie 300 and the heat exchange plate 200 on the heat exchange plate 200 can be effectively reduced.

[0044] Since the reinforcement section 212 effectively enhances the reinforcing effect of the reinforcing rib 210, L1 can be set to be greater than L to ensure that the cable tie 300 has a more reliable tightening force. For example, 50mm ≤ L1 ≤ 52mm ensures both the overall reinforcing effect of the reinforcing rib 210 on the heat exchange plate 200 and a greater tightening force of the cable tie 300 compared to when the reinforcement section 212 is not provided, resulting in a more reliable tightening effect. Preferably, L1 is set to 50mm, 50.5mm, 51mm, 51.5mm, 52mm, etc., without specific limitations.

[0045] Optionally, the width of the mating section 211 is greater than or equal to the width of the cable tie 300 to prevent the projection of the cable tie 300 onto the heat exchange plate 200 from being positioned within the reinforcing section 212. For example, the width of the mating section 211 can be approximately 5 mm wider than the width of the cable tie 300. It is understood that the width of the mating section 211 should not be set too much wider than the cable tie 300 to ensure that the width of the reinforcing section 212 is sufficient to effectively increase strength.

[0046] Preferably, the mating section 211 has reinforcing sections 212 at both ends in a direction perpendicular to the extension direction of the cable tie 300. This ensures the mating section 211 fits with the cable tie 300 while further strengthening the structure at both ends of the mating section 211 in a third direction, resulting in better reinforcement of the heat exchange plate 200 by the reinforcing ribs 210. It is understood that when the mating section 211 has reinforcing sections 212 at both ends in a direction perpendicular to the extension direction of the cable tie 300, the projection of the reinforcing ribs 210 onto the heat exchange plate 200 is I-shaped.

[0047] For example, the width of the cable tie 300 is W1, where 15mm ≤ W1 ≤ 22mm. If the width of the cable tie 300 is too large, the contact area with the heat exchange plate 200 and the battery cell 100 will be too large, which is detrimental to heat dissipation and expansion of the heat exchange plate 200 and the battery cell 100. If the width of the cable tie 300 is too small, the clamping force of the cable tie 300 on the heat exchange plate 200 and the battery cell 100 will be too small, failing to achieve a secure fastening effect. Preferably, 19.8mm ≤ W1 ≤ 20.2mm is used to ensure heat dissipation and expansion of the battery cell 100 and effective clamping force of the cable tie 300. More preferably, W1 is set to 20mm. Of course, in other embodiments, W1 can also be set to 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20.5mm, 21mm, 21.5mm, 22mm, etc., and no specific limitation is made here. Accordingly, the width of the mating section 211 is set to 20mm≤W1≤27mm, and the cable tie 300 is preferably centered relative to the mating section 211.

[0048] Furthermore, the width of the cable tie 300 is W1, and the width of the reinforcing rib 210 is W2, with 0.2 ≤ W1 / W2 ≤ 0.3. If the above ratio is set too small, the area of ​​the reinforcing rib 210 will be too large, resulting in a decreased effect on structural strength. Of course, the ratio cannot be set too large either. Preferably, the projection of the cable tie 300 onto the heat exchange plate 200 is completely within the projection of the reinforcing rib 210 onto the heat exchange plate 200, and the projection of the reinforcing rib 210 onto the heat exchange plate 200 is slightly wider than the width of the cable tie 300, reserving a certain amount of space for the installation of the cable tie 300 in the third direction. Preferably, 0.2 ≤ W1 / W2 ≤ 0.21. Of course, in other embodiments, W1 / W2 can also be set to 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, etc., without specific limitations here.

[0049] As an optional solution for battery pack 600, such as Figure 5As shown, a cooling channel 220 is provided inside the heat exchange plate 200. The cooling channel 220 is used to accommodate the flow of cooling medium to achieve cooling of the battery cell 100, resulting in better cooling effect and higher cooling efficiency. To reduce the deformation of the cooling channel 220 caused by the tightening force of the cable tie 300, the reinforcing rib 210 is arranged perpendicularly to the overlapping position of the projection of the cooling channel 220 on the heat exchange plate 200. This not only reduces the tightening force of the cable tie 300 on the side wall of the cooling channel 220, avoiding deformation of the cooling channel 220 and ensuring cooling effect, but also further strengthens the structure of the reinforcing rib 210 on the side wall of the cooling channel 220.

[0050] Optionally, the cooling channel 220 extends in a spiral shape, or the cooling channel 220 is as follows: Figure 5 The dashed line indicates an S-shaped extension. The aforementioned cooling channel 220 is designed to ensure that it can cover more of the heat exchange plate 200 to simultaneously cool multiple battery cells 100, while also ensuring that the cooling channel 220 has a longer flow distance to improve the cooling effect.

[0051] Furthermore, to facilitate the input and output of cooling medium into and out of the cooling channel 220, the heat exchange plate 200 is also equipped with an inlet 221 and an outlet 222. The cooling medium enters the cooling channel 220 through the inlet 221, is cooled by flowing through the cooling channel 220, and then flows out through the outlet 222. To avoid interference between the inlet 221 and the outlet 222 and the cable tie 300, the distance between the cable tie 300 and the inlet 221, and the distance between the cable tie 300 and the outlet 222, are both not less than 280mm. It is understandable that the distance between the cable tie 300 and the inlet 221, and the distance between the cable tie 300 and the outlet 222, should not be set too large. The tightening effect of the cable tie 300 and the size of the heat exchange plate 200 need to be comprehensively considered to ensure a more reasonable spatial layout of the battery pack 600.

[0052] Optionally, both the inlet 221 and the outlet 222 are located at one end of the heat exchange plate 200 in a direction perpendicular to the extension direction of the cable tie 300. That is, the inlet 221 and the outlet 222 are located on the same side of the heat exchange plate 200 and at one end of the heat exchange plate 200 in a third direction. When the battery pack 600 is placed on the frame 500, the inlet 221 and the outlet 222 are located close to the outside of the energy storage system to facilitate the connection of the inlet and outlet water pipes.

[0053] It is worth noting that, such as Figure 3As shown, the wall thickness of the cooling channel 220 is B, and the width of the cable tie 300 is W1. When the channel wall thickness is set larger, the structural strength of the heat exchange plate 200 is higher. Therefore, the width of the cable tie 300 can be reduced to lower costs. In other words, the wall thickness of the cooling channel 220 and the width of the cable tie 300 are inversely proportional. However, setting the channel wall thickness too high will reduce the flow area of ​​the cooling channel 220, resulting in less flowing cooling medium and a poorer cooling effect. Optionally, 16 ≤ W1 / B ≤ 16.5. Specifically, W1 / B can be set to 16, 16.1, 16.2, 16.3, 16.4, 16.5, etc., without specific limitations.

[0054] In this embodiment, we continue to refer to... Figure 2 Multiple cable ties 300 are arranged along a third direction to improve the binding effect of the cable ties 300 on multiple battery packs 600. Correspondingly, the number of reinforcing ribs 210 along a third direction is the same as that of the cable ties 300, and the projection of each reinforcing rib 210 on the heat exchange plate 200 overlaps at least partially with one cable tie 300, so that each cable tie 300 has a corresponding reinforcing rib 210, resulting in a better reinforcement effect.

[0055] Specifically, the sum of the areas of the multiple reinforcing ribs 210 is S1, and the area of ​​the heat exchange plate 200 is S2, where 0.26 ≤ S1 / S2 ≤ 0.27. When the sum of the areas of the multiple reinforcing ribs 210, S1, accounts for too large a proportion of the area of ​​the heat exchange plate 200, the reinforcing effect of the reinforcing ribs 210 is weakened; when the sum of the areas of the multiple reinforcing ribs 210, S1, accounts for too small a proportion of the area of ​​the heat exchange plate 200, the width of the reinforcing ribs 210 becomes too small, which not only fails to guarantee the overlap area between the reinforcing ribs 210 and the cable ties 300 projected onto the heat exchange plate 200, but also makes the processing and manufacturing of the reinforcing ribs 210 more difficult.

[0056] Optionally, the distance between adjacent cable ties 300 is L3, where 245mm ≥ L3 ≥ 240mm. An excessively large distance results in a poorer tightening effect of the cable ties 300, while an excessively small distance leads to waste and increased cost. For example, L3 can be set to 240mm, 241mm, 242mm, 243mm, 244mm, 245mm, etc., without specific limitations. The distance between adjacent reinforcing ribs 210 is L4, where 215mm ≥ L4 ≥ 212mm. An excessively large distance results in a narrow width for a particular reinforcing rib 210, making processing and manufacturing difficult; an excessively small distance results in an excessively large area for a particular reinforcing rib 210, leading to a poorer reinforcing effect. For example, L4 can be set to 212mm, 213mm, 214mm, 215mm, etc., without specific limitations.

[0057] As an optional configuration for the battery pack 600, the battery pack 600 also includes end plates 400. The end plates 400 are positioned at both ends of multiple battery cells 100 along a first direction. Cable ties 300 are fastened to the sides of the two end plates 400 that are far apart from each other. By including the end plates 400, damage to the battery cells caused by the tightening force of the cable ties 300 on the battery cells 100 can be avoided. Furthermore, the cable ties 300 are wrapped around the outside of the end plates 400, improving the connection reliability between the end plates 400 and the battery body, thereby increasing the overall integration of the battery pack 600.

[0058] Preferably, a groove is provided on the side of the end plates 400 that is far apart from each other, and the cable tie 300 can be placed in the groove. By providing the groove, on the one hand, the cable tie 300 can be positioned for installation, and on the other hand, the size of the battery pack 600 in the first direction can be reduced, thereby increasing the energy density of the battery pack 600.

[0059] Furthermore, the width of the groove is slightly larger than the width of the cable tie 300, providing tolerance for the installation of the cable tie 300. The depth of the groove is at least greater than half the thickness of the cable tie 300, preventing the cable tie 300 from protruding excessively from the outer side of the end plate 400. This helps prevent the cable tie 300 from being worn or damaged, improving the reliability of the cable tie 300 in securing the battery cell 100. Regarding the width and depth of the groove, those skilled in the art can set them according to actual needs, and no specific limitations are made here.

[0060] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery pack, characterized in that, It includes a plurality of battery cells (100) arranged sequentially along a first direction, and a heat exchange plate (200) is provided on one side of the plurality of battery cells (100) along a second direction, wherein the first direction is perpendicular to the second direction. The battery pack also includes cable ties (300) for securing multiple battery cells (100) and is wrapped around the heat exchange plate (200) on the side away from the multiple battery cells (100); the heat exchange plate (200) on the side away from the battery cells (100) is provided with reinforcing ribs (210) extending in the same direction as the cable ties (300), and the projection of the reinforcing ribs (210) on the heat exchange plate (200) at least partially overlaps with the projection of the cable ties (300) on the heat exchange plate (200).

2. The battery pack of claim 1, wherein, The distance L between the end of the reinforcing rib (210) extending along the cable tie (300) and the end of the adjacent battery pack extending along the cable tie (300) is 40mm≤L≤45mm.

3. The battery pack of claim 1, wherein, The reinforcing rib (210) includes a mating section (211) and a reinforcing section (212) arranged in a direction perpendicular to the cable tie (300); the projection of the mating section (211) on the heat exchange plate (200) overlaps with the projection of the cable tie (300) on the heat exchange plate (200); the distance between the end of the mating section (211) and the end of the adjacent battery pack extending in the direction of the cable tie (300) is L1, and the distance between the end of the reinforcing section (212) and the end of the adjacent battery pack extending in the direction of the cable tie (300) is L2, where L1 is less than L2.

4. The battery pack of claim 3, wherein, The mating section (211) is provided with the reinforcing section (212) at both ends in a direction perpendicular to the extension direction of the cable tie (300).

5. The battery pack of claim 1, wherein, The width of the cable tie (300) is W1, 15mm≤W1≤22mm.

6. The battery pack of claim 1, wherein, The cable tie (300) has a width of W1, and the reinforcing rib (210) has a width of W2, where 0.2 ≤ W1 / W2 ≤ 0.

3.

7. The battery pack of claim 1, wherein, The reinforcing rib (210) protrudes toward the battery cell (100).

8. The battery pack of claim 7, wherein, The distance between the reinforcing rib (210) and the side of the heat exchange plate (200) away from the battery cell (100) is H, where 3mm≤H≤5mm.

9. The battery pack of claim 1, wherein, The heat exchange plate (200) is provided with a cooling channel (220), and the reinforcing rib (210) is arranged perpendicularly to the overlapping position of the projection of the heat exchange plate (200) and the projection of the cooling channel (220) on the heat exchange plate (200).

10. The battery pack of claim 9, wherein, The cooling channel (220) extends in a spiral shape or in an S-shape.

11. The battery pack of claim 1, wherein, The heat exchange plate (200) is provided with a cooling channel (220), the channel wall thickness of the cooling channel (220) is B, and the width of the cable tie (300) is W1, 16≤W1 / B≤16.

5.

12. The battery pack of claim 1, wherein, The heat exchange plate (200) is also provided with an inlet (221) and an outlet (222). The distance between the cable tie (300) and the inlet (221) and the distance between the cable tie (300) and the outlet (222) are both not less than 280mm.

13. The battery pack of claim 12, wherein, Both the inlet (221) and the outlet (222) are located at one end of the heat exchange plate (200) in a direction perpendicular to the extension direction of the cable tie (300).

14. The battery pack of claim 1, wherein, The cable ties (300) are provided in multiple directions along the third direction. The number of reinforcing ribs (210) along the third direction is the same as that of the cable ties (300). The projection of each reinforcing rib (210) on the heat exchange plate (200) overlaps at least partially with one of the cable ties (300). The third direction is perpendicular to both the first direction and the second direction.

15. The battery pack of claim 14, wherein, The sum of the areas of the plurality of reinforcing ribs (210) is S1, the area of ​​the heat exchange plate (200) is S2, and 0.26≤S1 / S2≤0.

27.

16. The battery pack of claim 15, wherein, The distance between adjacent cable ties (300) is L3, 245mm ≥ L3 ≥ 240mm; and / or, the distance between adjacent reinforcing ribs (210) is L4, 215mm ≥ L4 ≥ 212mm.

17. The battery pack of claim 1, wherein, The battery pack is also provided with end plates (400), which are disposed at both ends of the plurality of battery cells (100) along the first direction, and the cable ties (300) are fastened to the side of the two end plates (400) that are far apart from each other.

18. The battery pack of claim 17, wherein, The end plates (400) are provided with grooves on the opposite sides, and the cable ties (300) can be placed in the grooves.

19. An energy storage system, characterized by, It includes a frame (500) and a plurality of battery packs as described in any one of claims 1-18 disposed on the frame (500).

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