Battery pack and electric device

Abstract

The utility model belongs to battery technical field discloses a kind of battery pack and electric device. Battery pack includes battery module, first cold plate and second cold plate, battery module includes multiple battery monomers, and it is arranged along Y direction in multiple rows, and the side of each battery monomer along Z direction is equipped with explosion-proof valve, Y direction is the width direction of battery monomer, Z direction is the height direction of battery monomer;First cold plate is set to the side of battery module close to explosion-proof valve along Z direction;Second cold plate includes side cold plate and the end cold plate vertically connected with side cold plate;Side cold plate extends along Z direction, and it is set between two rows of adjacent battery monomers;End cold plate extends along Y direction, and it is contacted with the side of battery module along Z direction away from explosion-proof valve. The cooling area of battery module in the battery pack is large, cooling efficiency is high, and the working condition demand of large ratio charge-discharge can be satisfied.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles is gradually increasing, and consumers are increasingly inclined to choose new energy vehicles. As a result, people are paying more and more attention to and demanding more from the core component of new energy vehicles, namely the battery pack. Not only does the battery pack need to provide good power performance, but it also needs to have extremely superior stability so that it can ensure the personal safety of passengers even in the event of an emergency.

[0003] Every year, there are tragic cases of electric vehicle batteries experiencing thermal runaway that propagates to the entire vehicle, leading to fires and explosions. Therefore, the prevention and control of battery thermal runaway remains a critical issue. Most existing battery system cooling designs employ bottom or side cooling solutions, resulting in small cooling areas, low cooling efficiency, and poor performance under high-rate charge and discharge conditions. Utility Model Content

[0004] The purpose of this invention is to provide a battery pack and power supply device that can solve the problems of small cooling area, low cooling efficiency, and poor performance under high-rate charging and discharging conditions.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery pack, comprising:

[0007] A battery module comprising multiple battery cells arranged in multiple rows along the Y direction, wherein each battery cell is provided with an explosion-proof valve on one side along the Z direction, wherein the Y direction is the width direction of the battery cell and the Z direction is the height direction of the battery cell;

[0008] The first cold plate is disposed along the Z direction on the side of the battery module near the explosion-proof valve;

[0009] The second cold plate includes a side cold plate and an end cold plate vertically connected to the side cold plate; the side cold plate extends along the Z direction and is disposed between two adjacent rows of battery cells; the end cold plate extends along the Y direction and contacts the side of the battery module away from the explosion-proof valve along the Z direction.

[0010] As an alternative to the above-mentioned battery pack, the end cold plate and the side cold plate have a T-shaped cross-section. The end cold plate is in partial contact with the battery cells on opposite sides of the side cold plate, and the side cold plate extends to the first cold plate along the Z direction.

[0011] And / or, the end cold plate is connected to the side cold plate.

[0012] As an optional solution for the above-mentioned battery pack, a thermally conductive adhesive layer is provided between the side cooling plate and the battery cell;

[0013] And / or, a thermally conductive adhesive layer is provided between the end cold plate and the battery module;

[0014] And / or, a thermally conductive adhesive layer is provided between the first cold plate and the battery module.

[0015] As an alternative to the aforementioned battery pack, the first cold plate is provided with an insulation layer on the side away from the battery module along the Z direction, and a plurality of the insulation layers are arranged at intervals along the Y direction, avoiding the position of the explosion-proof valve.

[0016] As an alternative to the aforementioned battery pack, the first cold plate has a first through hole at the position corresponding to the explosion-proof valve;

[0017] The battery pack also includes a battery housing, which includes a base plate. A pressure relief cavity is formed in the base plate. A second through hole communicating with the pressure relief cavity is provided on the base plate. The second through hole corresponds to and communicates with the first through hole.

[0018] As an optional embodiment of the above-mentioned battery pack, the width dimension of the first through hole along the X direction is a, the width dimension of the second through hole along the X direction is b, the width dimension of the battery module along the X direction is c, the spacing between two adjacent battery modules along the X direction is d, the X direction is perpendicular to the Y direction and the Z direction respectively, wherein a, b, c and d satisfy: (2c+d)>b>2a.

[0019] As an alternative to the aforementioned battery pack, the base plate includes:

[0020] The upper plate has a second through hole disposed therein, and a plurality of insulation layers are stacked on the upper plate, avoiding the second through hole and along the Z direction.

[0021] The lower plate is disposed below the upper plate;

[0022] A flow channel plate assembly is disposed between the upper plate and the lower plate. The flow channel plate assembly includes two flow channel plates disposed opposite each other. The second through hole is located between the two flow channel plates, and the two flow channel plates form the pressure relief cavity.

[0023] As an alternative to the aforementioned battery pack, the base plate further includes at least two partitions, which are disposed between the upper plate and the lower plate and located outside the flow channel plate assembly.

[0024] As an alternative to the aforementioned battery pack, the lower plate has multiple pressure relief ports that communicate with the pressure relief chamber, and an explosion-proof vent valve is installed in each pressure relief port.

[0025] An electrical device includes the battery pack described above.

[0026] The beneficial effects of this utility model are:

[0027] In the battery pack provided by this utility model, the first cold plate cools the bottom surface of the battery module, the side cold plate in the second cold plate cools the side surface of the battery module, and the end cold plate in the second cold plate cools the top surface of the battery module. The cooling area of ​​the battery module is large and the cooling efficiency is high, which can meet the requirements of high-rate charging and discharging.

[0028] The battery pack provided by this utility model uses the above-mentioned battery pack, which has a good cooling effect on the battery module and a high safety factor.

[0029] In the battery pack provided by this utility model, the width of the first through hole along the X direction is a, the width of the first through hole along the X direction is b, the size of the battery cell along the X direction is c, and the distance between two adjacent battery cells along the X direction is d. Among them, a, b, c and d satisfy (2c+d)>b>2a, which can maximize the venting requirements of the battery module during thermal runaway, and at the same time ensure the rigidity requirements of the base plate to the entire battery pack. Attached Figure Description

[0030] Figure 1 This is a partial schematic diagram of the battery pack provided by this utility model;

[0031] Figure 2 This is a cross-sectional view of the battery cell, the first cold plate, and the second cold plate installed and connected according to this utility model.

[0032] Figure 3 yes Figure 1 Top view of the battery pack;

[0033] Figure 4 This is a partial schematic diagram of the battery pack provided by this utility model when some individual battery cells are not assembled;

[0034] Figure 5 yes Figure 4 Top view of the battery pack without individual battery cells assembled;

[0035] Figure 6 This is an exploded view of part of the battery pack provided by this utility model;

[0036] Figure 7 This is a structural schematic diagram of the battery box and the first cold plate provided by this utility model;

[0037] Figure 8 This is a schematic diagram of the structure of the battery box and insulation layer provided by this utility model;

[0038] Figure 9 This is a cross-sectional view of the battery box and insulation layer provided by this utility model;

[0039] Figure 10 This is a top view of the battery box provided by this utility model;

[0040] Figure 11 yes Figure 10 Sectional view along line AA;

[0041] Figure 12 yes Figure 11 A partial sectional view at point B in the middle;

[0042] Figure 13 This is a cross-sectional view of the battery box provided by this utility model.

[0043] In the picture:

[0044] 10. Battery housing; 11. Base plate; 110. Pressure relief chamber; 111. Upper plate; 112. Lower plate; 113. Flow channel plate; 114. Partition plate; 1111. Second through hole; 12. Housing frame; 20. Battery module; 21. Battery cell; 30. First cold plate; 301. First through hole; 40. Second cold plate; 41. End cold plate; 42. Side cold plate; 43. Connecting pipe; 50. Thermally conductive adhesive layer; 50a. First thermally conductive adhesive layer; 50b. Second thermally conductive adhesive layer; 60. Insulation layer; 70. Explosion-proof vent valve. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] 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.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0049] This embodiment provides an electrical device, including a battery pack. The electrical device can be a vehicle, mobile phone, laptop computer, power tool, electric toy, etc.

[0050] like Figure 1 As shown, the battery pack includes a battery housing 10 and a battery module 20. The battery module 20 is disposed inside the battery housing 10 and includes multiple battery cells 21. The multiple battery cells 21 are arranged in multiple rows along the Y direction, and each row includes multiple battery cells 21 arranged along the X direction. The X, Y, and Z directions are perpendicular to each other. In this embodiment, the X direction is the thickness direction of the battery cell 21, the Y direction is the width direction of the battery cell 21, and the Z direction is the height direction of the battery cell 21. Each battery cell 21 is provided with an explosion-proof valve on the side facing the bottom of the battery housing 10 along the Z direction. The battery housing 10 is provided with a pressure relief channel. The explosion-proof valve can open when the battery cell 21 experiences thermal runaway, so that the high-temperature and high-pressure thermal runaway gas generated inside the battery cell 21 can be discharged through the explosion-proof valve and the pressure relief channel to the outside of the battery housing 10, which can prevent heat spread and avoid the risk of the battery cell 21 exploding.

[0051] In order to control the temperature of the battery cell 21 during operation, the battery pack also includes a first cold plate 30 and a second cold plate 40. Both the first cold plate 30 and the second cold plate 40 are in contact with the battery cell 21. Both the first cold plate 30 and the second cold plate 40 have flow channels, and cooling medium flows in the flow channels, which can control the temperature of the battery cell 21.

[0052] Combination Figure 1 and Figure 2 As shown, the first cold plate 30 is disposed along the Z-direction on the side of the battery module 20 near the explosion-proof valve, that is, the first cold plate 30 is opposite to the side of the battery cell 21 where the explosion-proof valve is located; the second cold plate 40 includes a side cold plate 42 and an end cold plate 41 perpendicularly connected to the side cold plate 42; the side cold plate 42 extends along the Z-direction and is disposed between two adjacent rows of battery cells 21; the end cold plate 41 extends along the Y-direction and contacts the side of the battery cell 21 away from the explosion-proof valve along the Z-direction. Through the cooperation of the first cold plate 30 and the end cold plate 41, the two end faces of the battery cell 21 along the Z-direction can be contacted and cooled, and the side of the battery cell 21 can be cooled through the side cold plate 42. Heat exchange can be carried out on multiple surfaces of the battery cell 21 at the same time. The heat exchange contact area of ​​the battery cell 21 is large and the cooling efficiency is high, which can meet the requirements of high-rate charging and discharging conditions.

[0053] In some embodiments, the Z direction is vertical, and the X and Y directions are both horizontal. The explosion-proof valve is located at the bottom of the battery cell 21. The first cold plate 30 is located on the bottom surface of the battery module 20 and is used to exchange heat with the bottom surface of the battery module 20. The second cold plate 40 is located on the top of the battery cell 21. The end cold plate 41 exchanges heat with the top surface of the battery cell 21, and the side cold plate 42 exchanges heat with the side surface of the battery cell 21. This can achieve multi-faceted cooling of the battery cell 21 to improve the cooling effect and meet the requirements of high-rate charging and discharging.

[0054] In some embodiments, such as Figure 2 As shown, the end cold plate 41 and the side cold plate 42 have a T-shaped cross-section. The end cold plate 41 is in partial contact with the battery cells 21 on opposite sides of the side cold plate 42, and the side cold plate 42 extends along the Z-direction to the first cold plate 30. This structure ensures that the end cold plate 41 can contact and exchange heat with the battery cells 21 on both sides of the side cold plate 42, thereby uniformly cooling multiple battery cells 21. On the other hand, the side cold plate 42 has a large height along the Z-direction, which increases the contact area with the battery cells 21 and helps to improve heat exchange efficiency.

[0055] In some embodiments, one end of the side cold plate 42 along the Z direction is connected to the first cold plate 30 by thermally conductive adhesive, which helps to improve the stability of the second cold plate 40 and improve the overall strength of the battery pack.

[0056] For ease of explanation, each row of 21 battery cells is defined as a battery pack. In some embodiments, such as... Figure 3As shown, the battery packs are arranged in four rows along the Y direction. Each battery pack includes multiple battery cells 21 arranged along the X direction. The number of battery cells 21 in adjacent rows of battery packs is the same, and they are arranged in a one-to-one correspondence. There are three end cooling plates 41 and three side cooling plates 42. A side cooling plate 42 is placed between any two adjacent battery packs, and each side cooling plate 42 is connected to an end cooling plate 41. The lengths of the end cooling plates 41 and side cooling plates 42 along the X direction are adapted to the length of the battery pack along the X direction to ensure that the end cooling plates 41 and side cooling plates 42 can contact each battery cell 21 in adjacent battery packs. The width of the end cooling plate 41 along the Y direction is smaller than the width of the battery cell 21 along the Y direction, so that the end cooling plate 41 only contacts part of the top surface of the battery cell 21, avoiding the end cooling plate 41 obstructing the terminal posts and other structures on the battery cell 21.

[0057] In some other embodiments, the cross-sections of the end cooling plate 41 and the side cooling plate 42 may also be L-shaped, with the end cooling plate 41 only contacting the battery cell 21 on one side of the side cooling plate 42. To improve the uniformity of cooling for each row of battery cells 21, a second cooling plate 40 is provided on one side of each row of battery cells 21 along the Y direction, so as to ensure that each row of battery cells 21 is provided with an end cooling plate 41.

[0058] In some embodiments, the end cold plate 41 is connected to the side cold plate 42 so that the cooling medium can flow between the end cold plate 41 and the side cold plate 42, which is beneficial to improve the flow of the cooling medium. Moreover, it is only necessary to introduce the cooling medium into the end cold plate 41 or the side cold plate 42, which is beneficial to simplify the structure.

[0059] like Figure 4 As shown, the second cold plate 40 also includes a connecting pipe 43, which connects to the adjacent side cold plate 42 to facilitate the inflow and outflow of the cooling medium. Two connecting pipes 43 are provided: one is a medium inflow pipe, and the other is a medium outflow pipe. The medium inflow pipe is used to introduce the cooling medium into the side cold plate 42, and the medium outflow pipe is used to allow the cooling medium to flow out of the side cold plate 42. By providing two connecting pipes 43, the cooling medium in the end cold plate 41 and the side cold plate 42 can be kept flowing, which is beneficial to improving the heat exchange effect.

[0060] To improve heat exchange efficiency, in some embodiments, a thermally conductive adhesive layer 50 is provided between the side cold plate 42 and the battery cell 21, between the end cold plate 41 and the battery cell 21, and between the first cold plate 30 and the battery module 20. The thermally conductive adhesive layer 50 not only facilitates heat transfer but also improves the stability of the connection between the first cold plate 30, the second cold plate 40, and the battery module 20.

[0061] In some embodiments, combined with Figure 4 and Figure 5As shown, the thermally conductive adhesive layer 50 includes a first thermally conductive layer 50a and a second thermally conductive layer 50b. The first thermally conductive layer 50a is located between the second cold plate 40 and the battery cell 21, and the second thermally conductive adhesive layer 50b is located between the battery cell 21 and the first cold plate 30.

[0062] In some embodiments, such as Figure 2 As shown, the first thermally conductive layer 50a has an L-shaped cross-section, which includes a transverse thermally conductive layer 51 located between the end cold plate 41 and the battery cell 21, and a longitudinal thermally conductive layer 52 located between the side cold plate 42 and the battery cell 21. Each side cold plate 42 has a first thermally conductive adhesive layer 50a on both sides along the Y direction.

[0063] Combination Figure 5 and Figure 6 As shown, the second thermally conductive adhesive layer 50b is arranged in multiple groups, with two adjacent groups of the second thermally conductive adhesive layer 50b located on both sides of the side cold plate 42 along the Y direction. Each group consists of two second thermally conductive adhesive layers 50b, each extending along the X direction. The two second thermally conductive adhesive layers 50b within the same group are spaced apart along the Y direction to avoid the explosion-proof valve of the battery cell 21.

[0064] In some other embodiments, the thermally conductive adhesive layer 50 may be provided only between the side cold plate 42 and the battery cell 21, or only between the end cold plate 41 and the battery cell 21, or only between the first cold plate 30 and the battery module 20. The number and location of the thermally conductive adhesive layer 50 may be adjusted according to the actual heat exchange requirements.

[0065] like Figure 6 As shown, in some embodiments, a heat insulation layer 60 is provided on the side of the first cold plate 30 away from the battery module 20 along the Z direction. The heat insulation layer 60 can block the heat transfer between the first cold plate 30 and the battery housing 10. On the one hand, this helps to control the temperature of the battery cell 21, and on the other hand, it can prevent the heat generated by the airflow when the battery cell 21 experiences thermal runaway from being transferred to the battery cell 21 in the reverse direction during the process of being discharged through the pressure relief channel in the battery housing 10, thereby helping to prevent heat spread.

[0066] In some embodiments, such as Figure 7 As shown, a first through hole 301 is provided on the first cold plate 30 at the position corresponding to the explosion-proof valve; as Figure 8 and Figure 9As shown, the battery housing 10 includes a base plate 11 and a housing frame 12. A pressure relief chamber 110 is formed within the base plate 11. The base plate 11 is provided with a second through hole 1111 and a pressure relief port that communicate with the pressure relief chamber 110. The second through hole 1111 corresponds to and communicates with the first through hole 301. When a thermal runaway occurs in a battery cell 21, the thermal runaway airflow inside the battery cell 21 opens the explosion-proof valve, passes through the first through hole 301 and the second through hole 1111 in sequence, enters the pressure relief chamber 110, and is then discharged through the pressure relief port.

[0067] It should be noted that the first through hole 301 on the first cold plate 30 is not connected to the flow channel inside the first cold plate 30, so as to avoid leakage of cooling medium.

[0068] In some embodiments, such as Figure 8 and Figure 9 As shown, multiple insulation layers 60 are provided, and the multiple insulation layers 60 are arranged at intervals along the Y direction, avoiding the position of the explosion-proof valve.

[0069] In some other embodiments, only one insulation layer 60 may be provided. A third through hole is provided on the insulation layer 60 at the position corresponding to the explosion-proof valve to avoid the explosion-proof valve and ensure that the first through hole 301 can communicate with the second through hole 1111.

[0070] In some embodiments, combined with Figure 5 and Figure 10 As shown, the width dimension of the first through hole 301 along the Y direction is a, the width dimension of the second through hole 1111 along the Y direction is b, the width dimension of the battery module 20 along the Y direction is c, and the distance between two adjacent battery modules 20 along the Y direction is d. Among them, a, b, c, and d satisfy: (2c+d)>b>2a. The fact that a, b, c, and d satisfy the above relationship can maximize the exhaust efficiency of the battery cell 21 during thermal runaway, while ensuring the rigidity requirements of the base plate 11 and the entire battery pack.

[0071] For example, the number of first through holes 301 is the same as the number of explosion-proof valves, and they are set in a one-to-one correspondence, while the number of second through holes 1111 is less than the number of first through holes 301.

[0072] Understandably, the number of second through holes 1111 is less than the number of first through holes 301, in order to reduce the number of openings on the base plate 11 and thus improve the strength of the base plate 11. Each second through hole 1111 can easily allow thermal runaway gas to enter the pressure relief chamber 110 through at least one first through hole 301, which is beneficial to improving the efficiency of the battery cell 21 that has experienced thermal runaway to discharge thermal runaway gas, thereby preventing heat propagation and explosion risk. The width dimension b of the second through hole 1111 along the Y direction is less than the sum of the dimensions of the two battery cells 21 along the Y direction, which can ensure that two adjacent second through holes 1111 along the Y direction are not connected, thereby improving the strength of the base plate 11.

[0073] In some embodiments, such as Figure 11-13 As shown, the base plate 11 includes an upper plate 111, a lower plate 112, and a flow channel plate assembly. The upper plate 111 is located above the lower plate 112 and is spaced apart. The flow channel plate assembly is located between the upper plate 111 and the lower plate 112. A second through hole 1111 is provided on the upper plate 111. The insulation layer 60 avoids the second through hole 1111 and is stacked on the upper plate 111 along the Z direction. The flow channel plate assembly includes two flow channel plates 113 arranged opposite each other along the Y direction. The second through hole 1111 is located between the two flow channel plates 113. The two flow channel plates 113 form a pressure relief cavity 110. The base plate 11 adopts the above structure, which forms a cavity between the upper plate 111 and the lower plate 112, which can play a role in heat insulation. The flow channel plate 113, together with the upper plate 111 and the lower plate 112, forms a pressure relief cavity 110, which can guide the thermal runaway airflow to be discharged in a directional manner, prevent the airflow in the pressure relief cavity 110 from spreading randomly, and reduce the impact of the thermal runaway airflow on other battery cells 21.

[0074] For example, the battery cell 21 is arranged in four rows, and correspondingly, the flow channel plate assembly is arranged in four groups to form four pressure relief chambers 110. Each row of battery cell 21 corresponds to one pressure relief chamber 110 to avoid thermal runaway airflow affecting other rows of battery cells 21.

[0075] In some embodiments, the base plate 11 further includes at least two partitions 114, which are disposed between the upper plate 111 and the lower plate 112 and located outside the flow channel plate assembly. By providing partitions 114, the cavity located outside the pressure relief chamber 110 between the upper plate 111 and the lower plate 112 can be divided into multiple sub-cavities. These sub-cavities can serve as heat insulation cavities, preventing the temperature inside the pressure relief chamber 110 from diffusing to both sides, thereby reducing the impact of thermal runaway airflow on other battery cells 21 and thus helping to prevent heat propagation.

[0076] For example, such as Figure 13 As shown, each flow channel plate 113 is provided with multiple baffles 114 on one side along the Y direction to divide the space on both sides of the pressure relief chamber 110 into multiple sub-cavities, which not only helps to improve the heat insulation effect, but also improves the strength of the base plate 11.

[0077] In some embodiments, the lower plate 112 is provided with a plurality of pressure relief ports communicating with the pressure relief chamber 110. An explosion-proof vent valve 70 is installed in the pressure relief port. The explosion-proof vent valve 70 can be opened when there is thermal runaway gas in the pressure relief chamber 110 so as to discharge the thermal runaway gas.

[0078] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: The battery module (20) includes multiple battery cells (21) arranged in multiple rows along the Y direction. Each battery cell (21) is provided with an explosion-proof valve on one side along the Z direction. The Y direction is the width direction of the battery cell (21), and the Z direction is the height direction of the battery cell (21). The first cold plate (30) is disposed along the Z direction on the side of the battery module (20) near the explosion-proof valve; The second cold plate (40) includes a side cold plate (42) and an end cold plate (41) vertically connected to the side cold plate (42); the side cold plate (42) extends along the Z direction and is disposed between two adjacent rows of battery cells (21); the end cold plate (41) extends along the Y direction and contacts the side of the battery module (20) away from the explosion-proof valve along the Z direction.

2. The battery pack according to claim 1, characterized in that, The end cold plate (41) and the side cold plate (42) have a T-shaped cross section. The end cold plate (41) is in partial contact with the battery cells (21) on opposite sides of the side cold plate (42). The side cold plate (42) extends along the Z direction to the first cold plate (30). And / or, the end cold plate (41) is connected to the side cold plate (42).

3. The battery pack according to claim 1, characterized in that, A thermally conductive adhesive layer (50) is provided between the side cooling plate (42) and the battery cell (21); And / or, a thermally conductive adhesive layer (50) is provided between the end cold plate (41) and the battery module (20); And / or, a thermally conductive adhesive layer (50) is provided between the first cold plate (30) and the battery module (20).

4. The battery pack according to claim 1, characterized in that, The first cold plate (30) is provided with a heat insulation layer (60) on the side away from the battery module (20) along the Z direction, and multiple heat insulation layers (60) are arranged at intervals along the Y direction, avoiding the position of the explosion-proof valve.

5. The battery pack according to claim 4, characterized in that, The first cold plate (30) has a first through hole (301) at the position corresponding to the explosion-proof valve; The battery pack also includes a battery housing (10), the battery housing (10) includes a base plate (11), a pressure relief cavity (110) is formed in the base plate (11), and a second through hole (1111) communicating with the pressure relief cavity (110) is provided on the base plate (11). The second through hole (1111) corresponds to and communicates with the first through hole (301).

6. The battery pack according to claim 5, characterized in that, The width dimension of the first through hole (301) along the X direction is a, the width dimension of the second through hole (1111) along the X direction is b, the width dimension of the battery cell (21) along the X direction is c, the distance between two adjacent battery cells (21) along the X direction is d, the X direction is perpendicular to the Y direction and the Z direction respectively, wherein a, b, c and d satisfy: (2c+d)>b>2a.

7. The battery pack according to claim 5, characterized in that, The base plate (11) includes: Upper plate (111), the second through hole (1111) is disposed on the upper plate (111), and a plurality of the heat insulation layers (60) are stacked on the upper plate (111) along the Z direction, avoiding the second through hole (1111); The lower plate (112) is disposed below the upper plate (111); A flow channel plate assembly is disposed between the upper plate (111) and the lower plate (112). The flow channel plate assembly includes two flow channel plates (113) disposed opposite to each other. The second through hole (1111) is located between the two flow channel plates (113), and the two flow channel plates (113) form the pressure relief cavity (110).

8. The battery pack according to claim 7, characterized in that, The base plate (11) also includes at least two partitions (114), which are disposed between the upper plate (111) and the lower plate (112) and located outside the flow channel plate assembly.

9. The battery pack according to claim 7, characterized in that, The lower plate (112) is provided with a plurality of pressure relief ports that communicate with the pressure relief chamber (110), and an explosion-proof vent valve (70) is installed in the pressure relief port.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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