Battery pack and vehicle

Abstract

The utility model provides a battery pack and a vehicle. The battery pack comprises a battery cell group and a first cold plate, the battery cell group is provided with side walls which are oppositely arranged along a first direction; the first cold plate is arranged on at least one side of the battery cell group along the first direction and is propped against the side wall, and the melting point of the first cold plate does not exceed the thermal runaway temperature threshold value of the battery cell group. In the case of thermal runaway of the battery cells in the battery cell group, high-temperature gas and flames ejected by the thermal runaway battery cells can melt the corresponding parts of the first cold plate, so that a cooling medium in the first cold plate flows out, and the thermal runaway battery cells can be quickly extinguished and cooled; and the cooling medium flows at the nearby part of the thermal runaway battery cell, so that the battery cell at the periphery of the thermal runaway battery cell is cooled, the spreading of thermal runaway can be effectively slowed down, the timely and effective cooling effect on the battery cell group is achieved, and the fire, explosion and the like of the battery pack are avoided.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and a vehicle. Background Technology

[0002] As the main power source for electric or hybrid vehicles, the safety performance of the battery pack is of paramount importance. As the core component within the battery pack, the charging and discharging performance of the battery cell determines the overall performance of the battery pack. During the charging and discharging process, the battery cell generates a large amount of heat, which causes the ambient temperature inside the battery pack and the temperature of the battery cell to rise. If the heat is not absorbed or dissipated in time, it may lead to thermal runaway of the battery cell. If the thermal runaway battery cell is not dealt with in a timely and effective manner, it may cause the battery pack to catch fire or explode, resulting in serious safety accidents.

[0003] Therefore, cold plates are usually installed in battery packs to cool the cells. However, the cooling effect of cold plates in the existing technology is limited. If a cell experiences thermal runaway, the cold plate cannot cool the thermally runaway cell in a timely and effective manner, thus failing to ensure the safety of the battery pack. Utility Model Content

[0004] In view of this, this application provides a battery pack and vehicle, thereby solving the problem that the cooling effect of the cold plate in the prior art is limited and cannot effectively cool the thermal runaway battery cells in a timely manner.

[0005] To achieve the above objectives, the technical solution of this application is as follows:

[0006] This application provides a battery pack, including a cell assembly and a first cold plate;

[0007] The battery cell assembly has sidewalls that are disposed opposite each other along a first direction;

[0008] The first cold plate is disposed on at least one side of the battery cell assembly along the first direction and abuts against the side wall. The melting point of the first cold plate does not exceed the thermal runaway temperature threshold of the battery cell assembly.

[0009] Optionally, the battery pack further includes a top wall and a bottom wall disposed opposite each other along a second direction, wherein the second direction intersects the first direction; the battery pack further includes a second cold plate, the second cold plate abutting against the bottom wall of the battery pack.

[0010] Optionally, the dimension of the battery cell assembly along the second direction is H1, and the dimension of the first cold plate along the second direction is H2; wherein, H1 and H2 satisfy: 50%H1≤H2≤80%H1.

[0011] Optionally, a first gap H3 is reserved between the end of the first cold plate and the bottom wall; wherein H3 satisfies: 25%H1≤H3≤50%H1.

[0012] Optionally, a second gap H4 is reserved between the end of the first cold plate and the top wall; wherein H4 satisfies: 1mm≤H4≤5mm.

[0013] Optionally, the battery pack further includes a housing, and the battery cell assembly and the first cold plate are both disposed within the housing; the distance between the sidewall and the housing along the first direction is W1, the length of the battery cell assembly along the third direction is L1, and the capacity of the cooling medium in the first cold plate is V1; wherein, the third direction intersects the first direction and the second direction respectively; wherein, W1, L1, and V1 satisfy: W1×L1×H1≤V1.

[0014] Optionally, the distance W1 between the sidewall and the housing along the first direction satisfies: 3mm≤W1≤10mm; and / or, the length L1 of the battery pack along the third direction satisfies: L1≤3000mm.

[0015] Optionally, the first cold plate is made of polyamide, polycarbonate or polyvinyl chloride, and / or the temperature resistance range of the first cold plate is -40℃ to 160℃.

[0016] Optionally, the first cold plate is disposed on opposite sides of the cell assembly along the first direction, and each of the first cold plates abuts against the side wall.

[0017] This application also provides a vehicle including a battery pack as described in any of the preceding claims.

[0018] Compared with the prior art, the battery pack and vehicle described in this application have the following advantages:

[0019] The battery pack of this application includes a cell assembly and a first cold plate. The cell assembly has sidewalls disposed opposite each other along a first direction. The first cold plate is disposed on at least one side of the cell assembly along the first direction and abuts against the sidewall. The melting point of the first cold plate does not exceed the thermal runaway temperature threshold of the cell assembly. In the event of thermal runaway of a cell in the cell assembly, the high-temperature gas and flame ejected by the thermally runaway cell will melt the corresponding part of the first cold plate, thereby causing the cooling medium inside the first cold plate to flow out, which can quickly extinguish and cool down the thermally runaway cell. At the same time, the cooling medium flows in the vicinity of the thermally runaway cell, which can cool down the cells around the thermally runaway cell, thereby effectively slowing down the spread of thermal runaway and providing timely and effective cooling down of the cell assembly, preventing the battery pack from catching fire or exploding.

[0020] The vehicle described in this application has the same or similar advantages as the existing technology and the aforementioned battery pack, which will not be elaborated here. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a schematic diagram of a battery pack according to an embodiment of this application;

[0023] Figure 2 This is a side view of a battery pack viewed along a third direction in an embodiment of this application;

[0024] Figure 3 This is a partial cross-sectional view of a battery pack at the top wall of the cell assembly in an embodiment of this application;

[0025] Figure 4 This is a cross-sectional view of a battery pack along a first direction and a third direction in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Cell assembly, 11-Side wall, 12-Top wall, 120-Terminal post, 13-Bottom wall, 2-First cold plate, 3-Casing;

[0028] X - First direction, Y - Third direction, Z - Second direction. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] The terms "comprising," "including," or any other variations thereof used in the specification and claims of this application are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0032] The following detailed description of a battery pack and vehicle provided in this application is illustrated with specific embodiments.

[0033] In the embodiments of this application, Figure 1 This is a schematic diagram of a battery pack. Figure 2 It is a side view of a battery pack viewed along a third direction. Figure 3 This is a partial cross-sectional view of the battery pack at the top wall 12 of the cell assembly 1. Figure 4 It is a cross-sectional view of a battery pack along a plane containing a first direction and a third direction, as shown in the reference. Figures 1 to 4 As shown, the battery pack has a first direction X, a second direction Z, and a third direction Y. The first direction X, the second direction Z, and the third direction Y intersect each other. In some embodiments, the first direction X, the second direction Z, and the third direction Y are set to be perpendicular to each other. Here, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximately perpendicularity as commonly understood, such as the state where the angle between each pair of the first direction X, the second direction Z, and the third direction Y is 89° to 91°. These are all considered to be mutually perpendicular. At the same time, the first direction X can be regarded as the width direction of the cell pack 1, the second direction Z can be regarded as the dimension direction of the cell pack 1, and the third direction Y can be regarded as the length direction of the cell pack 1.

[0034] Reference Figure 1 The battery pack provided in this application embodiment includes a cell assembly 1 and a first cold plate 2; the cell assembly 1 has a sidewall 11 disposed opposite to each other along a first direction X; the first cold plate 2 is disposed on at least one side of the cell assembly 1 along the first direction X and abuts against the sidewall 11, and the melting point of the first cold plate 2 does not exceed the thermal runaway temperature threshold of the cell assembly 1.

[0035] Specifically, cell group 1 includes multiple cells, as shown in the reference. Figure 1As shown, multiple battery cells are arranged in parallel along the first direction X and the third direction Y. These multiple cells are connected in series and parallel to form a cell group 1. Cell group 1 is the charging and discharging unit in the battery pack. During the charging and discharging process, heat is generated. If the heat is not absorbed or dissipated in time, the temperature of cell group 1 will rise. If cell group 1 operates in a high-temperature environment for a long time, or if there is a serious overcharge or over-discharge, some cells in cell group 1 may experience thermal runaway. Thermal runaway cells will emit a large amount of high-temperature gas, smoke, and flames, and may even explode. Therefore, if thermal runaway cells are not dealt with in a timely and effective manner, it is very easy to cause the battery pack to catch fire or explode, resulting in serious safety accidents.

[0036] To this end, the battery pack also includes a first cold plate 2, which has flow channels filled with a cooling medium. The cooling medium can be pure water or an organic compound such as ethylene glycol; the specific type is not limited in this embodiment. The cell assembly 1 has sidewalls 11 arranged opposite each other along a first direction X. The first cold plate 2 is located on at least one side of the cell assembly 1 along the first direction X and abuts against the sidewall 11. During its circulation, the cooling medium in the first cold plate 2 can carry away the heat generated by the cell assembly 1, thereby cooling the cell assembly 1. In some embodiments, the first cold plate 2 is located on one side of the cell assembly 1 along the first direction X, achieving cooling of the cell assembly 1 through single-sided cooling. This helps control the overall weight of the battery pack and the cost of the first cold plate 2. In other embodiments, the first cold plate 2 is located on opposite sides of the cell assembly 1 along the first direction X, achieving cooling of the cell assembly 1 through double-sided cooling. This further enhances the cooling effect of the first cold plate 2 on the cell assembly 1 and reduces the probability of thermal runaway in the cell.

[0037] In this embodiment, the melting point of the first cold plate 2 does not exceed the thermal runaway temperature threshold of the cell assembly 1. Normally, the temperature of the cell assembly 1 during normal operation does not exceed 160℃~170℃. If the temperature of the cell assembly 1 exceeds 160℃~170℃, the probability of thermal runaway in the cells of the cell assembly 1 will significantly increase. The thermal runaway temperature of the cell assembly 1 refers to the temperature value at which thermal runaway occurs. Since the battery pack includes multiple cell assemblies 1, the temperature values ​​at which different cell assemblies 1 experience thermal runaway may differ. Some cell assemblies 1 may experience thermal runaway at 180℃, some at 190℃, and some at 200℃. Therefore, in this embodiment, the thermal runaway temperature threshold of the cell assembly 1 can be composed of multiple different thermal runaway temperatures of the cell assembly 1, such as 180℃, 185℃, 190℃, 195℃, 200℃, etc.

[0038] Assuming the thermal runaway temperature threshold of cell assembly 1 is 180℃, the first cold plate 2 is made of a material with a melting point of approximately 180℃. For example, the first cold plate 2 can be made of polyamide (PA), polycarbonate (PC), or polyvinyl chloride (PVC), which has good insulation properties and can provide electrical isolation between adjacent rows of cells when cell assembly 1 is operating normally. Alternatively, the temperature resistance range of the first cold plate 2 is -40℃ to 160℃. Here, the temperature resistance range refers to the temperature range that the material or component can withstand. When the temperature exceeds this range, the material properties change, leading to component damage. The melting point of the first cold plate 2 refers to the temperature at which the first cold plate 2 changes from a solid to a liquid state. The first cold plate 2 is selected within the temperature range mentioned above. Correspondingly, the melting point of the first cold plate 2 is relatively low. In the event of thermal runaway of the battery cell, the high-temperature gas and flames emitted by the thermally runaway battery cell will cause the corresponding part of the first cold plate 2 to melt. As a result, the cooling medium inside the first cold plate 2 will flow out and come into direct contact with the thermally runaway battery cell, which will play a role in quickly extinguishing the fire and cooling down. At the same time, the cooling medium will flow in the vicinity of the thermally runaway battery cell, which will cool down the battery cells around the thermally runaway battery cell. This will effectively slow down the spread of thermal runaway and provide timely and effective cooling down of the battery cell group 1, preventing the battery pack from catching fire or exploding.

[0039] Optionally, refer to Figure 1 and Figure 2 In some embodiments of this application, the cell assembly 1 further includes a top wall 12 and a bottom wall 13 disposed opposite each other along the second direction Z. The battery pack also includes a second cold plate (not shown in the figure), which abuts against the bottom wall 13 of the cell assembly 1. Specifically, in the embodiments of this application, the cell forming the cell assembly 1 is a cuboid cell, thereby forming the cell assembly 1 including a top wall 12, a bottom wall 13, and a side wall 11 located between the top wall 12 and the bottom wall 13. The top wall 12 refers to the side where the terminal post 120 of the cell is located in the cell assembly 1. The terminal post 120 is usually provided with a busbar (copper busbar, aluminum busbar, etc.). Multiple cells are connected in series and parallel through the busbar. The busbar is also connected to the flexible circuit board (FPC) in the battery pack, so that each control module in the battery pack can monitor or collect information such as current, voltage, and temperature of the cell through the flexible circuit board to avoid overcharging or over-discharging of the cell and ensure the safety of the battery pack.

[0040] Similarly, the second cold plate also has flow channels filled with cooling medium. The second cold plate mainly cools the bottom wall 13 of the cell assembly 1. Therefore, on the basis of the cooling effect of the first cold plate 2 on the side wall 11 of the cell assembly 1, it helps to improve the cooling effect of the cold plate on the cell assembly 1, achieve balanced cooling of each surface of the cell assembly 1, and reduce the probability of thermal runaway of the cell.

[0041] Optionally, refer to Figure 2 In some embodiments of this application, the size of the battery cell assembly 1 along the second direction Z is H1, and the size of the first cold plate 2 along the second direction Z is H2; wherein, H1 and H2 satisfy: 50%H1≤H2≤80%H1.

[0042] Specifically, since the temperature of the cell pack 1 near the center of the side wall 11 is higher and the temperature near the edge of the side wall 11 is lower during operation, the first cold plate 2 can be designed to be slightly smaller than the size of the cell pack 1 along the second direction Z. When installing the first cold plate 2, it is installed near the center of the side wall 11 of the cell pack 1, so that there is a gap between the first cold plate 2 and the bottom wall 13 of the cell pack 1 and between the first cold plate 2 and the top wall 12 of the cell pack 1. This can ensure the cooling effect of the first cold plate 2 on the side wall 11 of the cell pack 1, save the material cost of the first cold plate 2, and reduce the overall weight of the battery pack.

[0043] In addition, because the bottom wall 13 of the battery cell assembly 1 is provided with a second cold plate ( Figure 2 (Not shown in the diagram) If the dimension of the first cold plate 2 along the second direction Z is nearly identical to the dimension of the cell assembly 1 along the second direction Z, it means that the end of the first cold plate 2 near the bottom wall 13 of the cell assembly 1 will contact the second cold plate. This can easily lead to excessively low internal temperature of the cell assembly 1, which is also detrimental to the normal operation of the cell assembly 1. Therefore, in this embodiment, the relationship between the dimension H1 of the cell assembly 1 along the second direction Z and the dimension H2 of the first cold plate 2 along the second direction Z is set as follows: 50%H1≤H2≤80%H1. For example, H2 can be 60%H1, 66%H1, 70%H1, 75%H1, etc. Within the above range, the cooling effect of the first cold plate 2 on the side wall 11 of the cell assembly 1 can be effectively guaranteed. It can be understood that the larger the proportion of H2 within the above range, the better the cooling effect of the first cold plate 2 on the cell assembly 1; the smaller the proportion of H2 within the above range, the lower the manufacturing cost of the first cold plate 2, which is more conducive to the lightweight design of the battery pack.

[0044] Furthermore, refer to Figure 2In some embodiments of this application, a first gap H3 is reserved between the end of the first cold plate 2 and the bottom wall 13. The first gap H3 satisfies the following condition: 25%H1≤H3≤50%H1. For example, H3 can be 30%H1, 40%H1, 45%H1, etc., to prevent the distance between the first cold plate 2 and the bottom wall 13 of the cell assembly 1 from being too close, which could lead to excessively low internal temperature of the cell assembly 1. Furthermore, the setting of the first gap H3 can also be determined with reference to the cooling performance of the second cold plate. If the cooling performance of the second cold plate is stronger, the proportion of the first gap H3 within the above range can be relatively larger; if the cooling performance of the second cold plate is weaker, the proportion of the first gap H3 within the above range can be relatively smaller. It should be noted that whether the bottom wall 13 of the cell assembly 1 has a second cold plate or not, a first gap H3 can be reserved between the end of the first cold plate 2 and the bottom wall 13 to prevent excessively low internal temperature of the cell assembly 1.

[0045] Or, refer to Figure 3 In some embodiments of this application, a second gap H4 is reserved between the end of the first cold plate 2 and the top wall 12; wherein the second gap H4 satisfies: 1mm≤H4≤5mm, such as H4 can be 2mm, 3mm, etc. Since there is no cold plate on the top wall 12 of the cell assembly 1, the size of the second gap H4 reserved between the end of the first cold plate 2 and the top wall 12 can be relatively small, so as to ensure the cooling effect of the first cold plate 2 on the cell assembly 1, and to avoid the temperature of the side of the cell assembly 1 near the top wall 12 being too low.

[0046] Alternatively, in some embodiments of this application, a first gap H3 is reserved between the first cold plate 2 and the bottom wall 13 of the battery cell assembly 1, and a second gap H4 is reserved between the first cold plate 2 and the top wall 12 of the battery cell assembly 1. H3 and H4 simultaneously satisfy: 25%H1≤H3≤50%H1, 1mm≤H4≤5mm, so that the first cold plate 2 can provide a more ideal cooling effect for the battery cell assembly 1.

[0047] Optionally, refer to Figure 4 In some embodiments of this application, the battery pack further includes a housing 3, and the battery cell group 1 and the first cold plate 2 are both disposed inside the housing 3; the distance between the side wall 11 and the housing 3 along the first direction is W1, the length of the battery cell group 1 along the third direction is L1, and the capacity of the cooling medium in the first cold plate 2 is V1; wherein, W1, L1, and V1 satisfy: W1×L1×H1≤V1.

[0048] It is understood that both the cell assembly 1 and the first cold plate 2 are located inside the housing 3, and the second cold plate abuts against the bottom wall 13 of the cell assembly 1, thus the second cold plate is also located inside the housing 3. The housing 3 can serve as the enclosure of the battery pack, and therefore, various control modules can also be installed inside the housing 3. The control modules are electrically connected to the cell assembly 1 to manage the working status of the cell assembly 1.

[0049] Figure 4 It is a cross-sectional view of a battery pack along the plane containing a first direction X and a third direction Y, as shown in the figure. Figure 4 As shown, the sidewall 11 of the battery cell assembly 1 and the housing 3 have a distance of W1 along the first direction X. The length of the battery cell assembly 1 along the third direction Y is L1, and the capacity of the cooling medium in the first cold plate 2 is V1. W1, L1, and V1 satisfy: W1×L1×H1≤V1. The result of W1×L1×H1 is approximately the volume of the cavity formed between the sidewall 11 of the battery cell assembly 1 and the housing 3. This volume does not exceed the capacity of the cooling medium in the first cold plate 2, thus ensuring that the cooling medium flowing out after leakage from the first cold plate 2 can submerge the battery cell assembly 1, thereby ensuring that the cooling medium can effectively cool and reduce the temperature of the thermally runaway battery cell.

[0050] Furthermore, in some embodiments of this application, the distance W1 between the sidewall 11 of the battery cell assembly 1 and the housing 3 along the first direction X is set to satisfy: 3mm≤W1≤10mm. For example, W1 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, etc. W1 within the above range helps to control the overall size of the battery pack and also helps to avoid excessive shaking of the battery cell assembly 1 in the housing 3.

[0051] Alternatively, in some embodiments of this application, the length L1 of the battery cell assembly 1 along the third direction Y is set to satisfy: L1≤3000mm. Given a fixed distance W1 between the sidewall 11 of the battery cell assembly 1 and the housing 3 along the first direction X, if the size of L1 is too large, the space of the cavity formed between the sidewall 11 of the battery cell assembly 1 and the housing 3 will be larger. An excessively large space is not conducive to the uniform flow of the cooling medium and will have a certain impact on the cooling effect. Therefore, in this embodiment, the length L1 of the battery cell assembly 1 along the third direction Y is set to not exceed 3000mm to control the space of the cavity formed between the sidewall 11 of the battery cell assembly 1 and the housing 3 within a certain range, ensuring the flow effect of the cooling medium, thereby helping to improve the cooling effect of the cooling medium on the battery cell assembly 1. Of course, if the size of L1 is too small, the space of the cavity formed between the sidewall 11 of the battery cell assembly 1 and the housing 3 will be smaller, which is not conducive to the heat dissipation of the battery cell assembly 1. Therefore, the size of L1 should not be set too small. In this embodiment of the application, the size of L1 can be set to ≥300mm.

[0052] Alternatively, in some embodiments of this application, the distance W1 between the sidewall 11 of the battery cell assembly 1 and the housing 3 along the first direction X is set to satisfy: 3mm≤W1≤10mm, and the length L1 of the battery cell assembly 1 along the third direction Y is set to satisfy: L1≤3000mm, so that the first cold plate 2 can provide a more ideal cooling effect for the battery cell assembly 1.

[0053] Optionally, refer to Figure 1 In some embodiments of this application, the first cold plate 2 is disposed on opposite sides of the cell assembly 1 along the first direction, and each first cold plate 2 abuts against the side wall 11. Figure 1 In the battery pack shown, the cell pack 1 is distributed in two rows along the first direction X and in multiple rows along the third direction Y. There are three first cold plates 2. One first cold plate 2 is located between the two rows of cell pack 1, and the other two first cold plates 2 are located at the edges of the cell pack 1. Each first cold plate 2 abuts against the side wall 11 of the cell pack 1, thereby achieving cooling of the cell pack 1 through double-sided cooling. This helps to improve the cooling effect of the first cold plate 2 on the cell pack 1 and reduce the probability of thermal runaway of the cell.

[0054] This application also provides a vehicle, which can be a pure electric vehicle or a hybrid vehicle. The vehicle includes a battery pack, which is the main power component of the vehicle. The performance of the battery pack determines the vehicle's range, driving performance, safety performance, etc. The battery pack adopts the battery pack described in any of the foregoing embodiments. In the event of thermal runaway of the battery pack, the cooling medium in the first cold plate 2 will flow out to quickly extinguish and cool down the thermally runaway cells. At the same time, the cooling medium flows in the vicinity of the thermally runaway cells, cooling down the cells around the thermally runaway cells. This can effectively slow down the spread of thermal runaway and prevent the battery pack from catching fire or exploding, thus helping to improve the safety performance of the vehicle.

[0055] It should be understood that the phrase "some embodiments" throughout the specification means that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "some embodiments" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0056] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized by, The battery pack comprises a cell group (1) and a first cold plate (2); The cell group (1) has a side wall (11) oppositely arranged along a first direction (X); The first cold plate (2) is arranged on at least one side of the cell group (1) along the first direction (X) and abuts against the side wall (11), and the melting point of the first cold plate (2) does not exceed the thermal runaway temperature threshold of the cell group (1).

2. The battery pack of claim 1, wherein, The cell group (1) further has a top wall (12) and a bottom wall (13) oppositely arranged along a second direction (Z), wherein the second direction (Z) intersects the first direction (X); The battery pack further comprises a second cold plate abutting against the bottom wall (13) of the cell group (1).

3. The battery pack of claim 2, wherein, The dimension of the cell group (1) along the second direction (Z) is H1, and the dimension of the first cold plate (2) along the second direction (Z) is H2; Wherein, H1 and H2 satisfy: 50% H1≤H2≤80% H1.

4. The battery pack of claim 2, wherein, A first spacing H3 is reserved between the end of the first cold plate (2) and the bottom wall (13); Wherein, H3 satisfies: 25% H1≤H3≤50% H1.

5. The battery pack of claim 2, wherein, A second spacing H4 is reserved between the end of the first cold plate (2) and the top wall (12); Wherein, H4 satisfies: 1mm≤H4≤5mm.

6. The battery pack of claim 1, wherein, The battery pack further comprises a shell (3), and the cell group (1) and the first cold plate (2) are arranged in the shell (3); The spacing between the side wall (11) and the shell (3) along the first direction (X) is W1, the length of the cell group (1) along a third direction (Y) is L1, and the capacity of the cooling medium in the first cold plate (2) is V1; Wherein, the third direction (Y) intersects the first direction (X) and the second direction (Z) respectively; Wherein, W1, L1, V1 satisfy: W1×L1×H1≤V1.

7. The battery pack of claim 6, wherein, The spacing W1 between the side wall (11) and the shell (3) along the first direction (X) satisfies: 3mm≤W1≤10mm; And / or, the length L1 of the cell group (1) along the third direction (Y) satisfies: L1≤3000mm.

8. The battery pack of any one of claims 1-7, wherein, The first cold plate (2) is made of polyamide, polycarbonate or polyvinyl chloride; and / or, the temperature resistance range of the first cold plate (2) is -40°C~160°C.

9. The battery pack of any one of claims 1-7, wherein, The first cold plate (2) is arranged on opposite sides of the cell group (1) along the first direction (X), and each first cold plate (2) abuts against the side wall (11).

10. A vehicle characterized by comprising: The battery pack comprises the battery pack according to any one of claims 1-9.

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