A battery pack

Abstract

The utility model relates to battery technology field discloses a kind of battery pack, including box and battery group. Box interior is formed with containing cavity, and box includes box bottom plate. Battery group is set in containing cavity, and battery group includes multiple single battery in array arrangement, and single battery includes shell and the electric core being set in shell, and shell includes the shell bottom plate towards box bottom plate. One of box bottom plate and shell bottom plate is provided with liquid inlet connector and liquid outlet connector, and the other is provided with the liquid inlet hole corresponding with liquid inlet connector and the liquid outlet hole corresponding with liquid outlet connector. Liquid inlet connector is inserted with corresponding liquid inlet hole, and liquid outlet connector is inserted with corresponding liquid outlet hole, and liquid inlet connector is used to pass into heat exchange medium between shell and electric core, and liquid outlet connector is used for the heat exchange medium between shell and electric core to flow out. The battery pack of the utility model can improve the temperature control effect and assembly efficiency of electric core.

Description

Technical Field

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

[0002] With the continuous development of battery pack technology, the demand for battery pack assembly efficiency and thermal management capabilities is increasing. However, current battery packs typically rely on liquid cooling plates for thermal management. The assembly process of liquid cooling plates is as complex as that of battery cells, taking a long time and resulting in poor thermal management performance.

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

[0004] The purpose of this invention is to provide a battery pack that improves the temperature control of the battery cells and increases the assembly efficiency of the battery pack.

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

[0006] A battery pack, comprising:

[0007] The box has an internal cavity, and the box includes a bottom plate.

[0008] A battery pack is disposed within the receiving cavity. The battery pack includes a plurality of individual cells arranged in an array. Each individual cell includes a housing and a cell disposed within the housing. The housing includes a housing bottom plate facing the bottom plate of the housing.

[0009] One of the base plate of the housing and the base plate of the casing is provided with a liquid inlet connector and a liquid outlet connector, and the other is provided with a liquid inlet hole corresponding to the liquid inlet connector and a liquid outlet hole corresponding to the liquid outlet connector; the liquid inlet hole is provided in a one-to-one correspondence with the liquid inlet connector, and the liquid outlet connector is provided in a one-to-one correspondence with the liquid outlet hole; the liquid inlet connector is inserted into the corresponding liquid inlet hole, and the liquid outlet connector is inserted into the corresponding liquid outlet hole; the liquid inlet connector is used to introduce heat exchange medium between the casing and the battery cell, and the liquid outlet connector is used to allow the heat exchange medium between the casing and the battery cell to flow out.

[0010] As an improvement to the above technical solution, the liquid inlet and the liquid outlet are provided on the single battery, and the liquid inlet connector and the liquid outlet connector are provided on the bottom plate of the housing.

[0011] As an improvement to the above technical solution, the single cell has a heat exchange channel that connects the liquid inlet and the liquid outlet.

[0012] As an improvement to the above technical solution, the housing further includes a first housing side plate, a second housing side plate, and a housing top plate, wherein the housing top plate is disposed opposite to the housing bottom plate;

[0013] The first housing side plate and the second housing side plate are disposed opposite to each other, and both are connected to the housing top plate and the housing bottom plate;

[0014] The heat exchange channel includes a first channel section, a second channel section, a third channel section, a fourth channel section, and a fifth channel section. The first channel section and the second channel section are disposed between the bottom plate of the shell and the battery cell. The third channel section is disposed between the first side plate of the shell and the battery cell. The fourth channel section is disposed between the top plate of the shell and the battery cell. The fifth channel section is disposed between the second side plate of the shell and the battery cell. The liquid inlet, the first channel section, the third channel section, the fourth channel section, the fifth channel section, the second channel section, and the liquid outlet are sequentially connected.

[0015] As an improvement to the above technical solution, the single battery also includes a sealing element, which is disposed between the bottom plate of the housing and the cell. The first flow channel section is located on the side of the sealing element near the first housing side plate, and the second flow channel section is located on the side of the sealing element near the second housing side plate.

[0016] As an improvement to the above technical solution, the liquid inlet and liquid outlet holes on the bottom plate of the housing are spaced apart along the length of the housing, and the first housing side plate and the second housing side plate are respectively disposed at both ends of the length of the housing.

[0017] As an improvement to the above technical solution, the single battery also includes a terminal post, which has a first end and a second end disposed opposite to each other. The first end of the terminal post is exposed outside the housing, and the second end passes through the fourth flow channel section and is connected to the battery cell.

[0018] As an improvement to the above technical solution, the surface of the pole post is provided with a thermally conductive insulating layer, and the area of ​​the pole post located within the fourth flow channel section is covered with the thermally conductive insulating layer.

[0019] As an improvement to the above technical solution, it also includes an elastic gasket, and the box also includes a box cover plate, which is disposed opposite to the box bottom plate, and the elastic gasket is sandwiched between the single battery and the box cover plate.

[0020] As an improvement to the above technical solution, a sealing ring is also included, wherein the sealing ring is provided between the liquid inlet connector and the liquid inlet hole and between the liquid outlet connector and the liquid outlet hole.

[0021] As an improvement to the above technical solution, both the inlet connector and the outlet connector are provided with receiving grooves extending circumferentially on their outer walls, and the sealing ring is at least partially embedded in the receiving grooves.

[0022] As an improvement to the above technical solution, the outer walls of the liquid inlet connector and the liquid outlet connector are both fixedly provided with buckles extending in their own circumference, and the walls of the liquid inlet hole and the liquid outlet hole are both provided with grooves that cooperate with the buckles.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] In this battery pack, the heat exchange medium is directly supplied to the interior of each individual cell via the bottom plate of the housing, effectively improving the temperature control of each cell. Furthermore, the bottom plate of the housing is connected to the bottom plate of the main unit via inlet and outlet connectors, allowing for rapid installation of each cell using robotic arms or similar equipment, thus improving assembly efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a portion of the structure of the battery pack provided in this embodiment of the utility model. Figure 1 ;

[0027] Figure 3 This is a schematic diagram of the battery pack structure of the battery pack provided in this embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of a portion of the structure of the battery pack provided in this embodiment of the utility model. Figure 2 ;

[0029] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6 yes Figure 4 Enlarged view of point B in the middle;

[0031] Figure 7 This is a schematic diagram of the liquid inlet connector of the battery pack provided in this embodiment of the utility model;

[0032] Figure 8 This is a schematic diagram of the structure of a single cell in the battery pack provided in this embodiment of the utility model. Figure 1 ;

[0033] Figure 9 This is a schematic diagram of the structure of a single cell in the battery pack provided in this embodiment of the utility model. Figure 2 ;

[0034] Figure 10 This is a top view of a single cell of the battery pack provided in this embodiment of the present invention;

[0035] Figure 11 yes Figure 10 Sectional view at CC;

[0036] Figure 12 yes Figure 10 Sectional view at point DD;

[0037] Figure 13 yes Figure 10 Sectional view at EE.

[0038] In the picture:

[0039] 1. Box body; 11. Box bottom plate; 12. Box side plate; 13. Box cover plate; 131. Main liquid inlet connector; 132. Main liquid outlet connector;

[0040] 2. Battery pack; 21. Single cell; 211. Housing; 2111. Housing bottom plate; 2112. First housing side plate; 2113. Second housing side plate; 2114. Housing top plate; 2115. Third housing side plate; 2116. Fourth housing side plate;

[0041] 212, Battery cell; 2121, Electrode assembly; 2122, Encapsulation layer;

[0042] 213. Sealing components;

[0043] 214. Terminal post; 2141. Thermally conductive insulating layer;

[0044] 3. Liquid inlet connector; 4. Liquid outlet connector;

[0045] 5. Elastic gasket;

[0046] 6. Sealing ring;

[0047] 7. Buckle;

[0048] 100, receiving cavity; 200, receiving groove; 300, slot;

[0049] 10. Liquid inlet; 20. Liquid outlet;

[0050] 30. Heat exchange channel; 301. First channel section; 302. Second channel section; 303. Third channel section; 304. Fourth channel section; 305. Fifth channel section. Detailed Implementation

[0051] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0052] 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.

[0053] 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.

[0054] 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 include 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.

[0055] like Figures 1-13As shown, this embodiment provides a battery pack, including a housing 1 and a battery pack 2. The housing 1 has an internal cavity 100 and includes a bottom plate 11. The battery pack 2 is disposed within the cavity 100 and includes a plurality of individual cells 21 arranged in an array. Each individual cell 21 includes a housing 211 and a cell 212 disposed within the housing 211. The housing 211 includes a bottom plate 2111 facing the bottom plate 11. One of the bottom plate 11 and the bottom plate 2111 is provided with an inlet connector 3 and an outlet connector 4, while the other is provided with an inlet hole 10 corresponding to the inlet connector 3 and an outlet hole 20 corresponding to the outlet connector 4. The inlet hole 10 corresponds one-to-one with the inlet connector 3, and the outlet connector 4 corresponds one-to-one with the outlet hole 20. The liquid inlet connector 3 is inserted into the corresponding liquid inlet hole 10, and the liquid outlet connector 4 is inserted into the corresponding liquid outlet hole 20. The liquid inlet connector 3 is used to introduce heat exchange medium between the housing 211 and the battery cell 212, and the liquid outlet connector 4 is used to allow the heat exchange medium between the housing 211 and the battery cell 212 to flow out. Specifically, the battery cell 212 includes an electrode assembly 2121 and an encapsulation layer 2122, with the electrode assembly 2121 disposed within the encapsulation layer 2122. The electrode assembly 2121 includes a positive electrode plate, a negative electrode plate, and a separator. The electrode assembly 2121 can be wound or stacked. The battery cell 212 can be a pouch cell 212 or a prismatic cell 212. When the battery cell 212 is a pouch cell 212, the encapsulation layer 2122 is an aluminum-plastic film. When the battery cell 212 is a prismatic cell 212, the encapsulation layer 2122 is an aluminum shell.

[0056] In this embodiment, the heat exchange medium is directly supplied to the interior of each individual cell 21 from the bottom plate 11 of the housing, which can effectively improve the temperature control of each individual cell 21. In addition, the bottom plate 2111 of the housing and the bottom plate 11 of the housing are connected by a liquid inlet connector 3 and a liquid outlet connector 4, so that each individual cell 21 can be quickly installed to the housing 1 using equipment such as a robotic arm, thereby improving assembly efficiency.

[0057] Furthermore, such as Figures 3-6As shown, the liquid inlet 10 and liquid outlet 20 are provided on the single cell 21. Each single cell 21 is provided with a liquid inlet 10 and a liquid outlet 20. The liquid inlet connector 3 and the liquid outlet connector 4 are provided on the bottom plate 11 of the box. Multiple liquid inlet connectors 3 and multiple liquid outlet connectors 4 are provided on the bottom plate 11 of the box. The liquid inlet connector 3 is inserted into the liquid inlet 10 in a one-to-one correspondence, and the liquid outlet connector 4 is inserted into the liquid outlet 20 in a one-to-one correspondence. In this embodiment, the liquid inlet connectors 3 on the bottom plate 11 of the tank are arranged in multiple rows, and the liquid outlet connectors 4 are also arranged in multiple rows. The bottom plate 11 of the tank is also provided with multiple main liquid inlet connectors 131 and multiple main liquid outlet connectors 132. The liquid inlet connectors 3 in the same row are connected to one main liquid inlet connector 131, and the liquid outlet connectors 4 in the same row are connected to one main liquid outlet connector 132. The heat exchange medium is supplied to each liquid inlet connector 3 through the main liquid inlet connector 131, and the heat exchange medium flowing out of each liquid outlet connector 4 is discharged through the main liquid outlet connector 132.

[0058] Furthermore, such as Figures 9-13 As shown, the single cell 21 has a heat exchange channel 30, which connects the liquid inlet 10 and the liquid outlet 20. The heat exchange medium entering the single cell 21 through the liquid inlet 10 flows to the liquid outlet 20 through the heat exchange channel 30. The heat exchange medium in the heat exchange channel 30 exchanges heat with the cell 212, thereby controlling the temperature of the cell 212.

[0059] Optionally, such as Figures 8-13 As shown, the housing 211 also includes a first housing side plate 2112, a second housing side plate 2113, and a housing top plate 2114. The housing top plate 2114 is disposed opposite to the housing bottom plate 2111. The first housing side plate 2112 and the second housing side plate 2113 are disposed opposite to each other and are both connected to the housing top plate 2114 and the housing bottom plate 2111. The heat exchange channel 30 includes a first channel section 301, a second channel section 302, a third channel section 303, a fourth channel section 304, and a fifth channel section 305. The first channel section 301 and the second channel section 302 are arranged between the bottom plate 2111 of the shell and the battery cell 212. The third channel section 303 is arranged between the first side plate 2112 of the shell and the battery cell 212. The fourth channel section 304 is arranged between the top plate 2114 of the shell and the battery cell 212. The fifth channel section 305 is arranged between the second side plate 2113 of the shell and the battery cell 212. The liquid inlet hole 10, the first channel section 301, the third channel section 303, the fourth channel section 304, the fifth channel section 305, the second channel section 302, and the liquid outlet hole 20 are connected in sequence. In other words, after the heat exchange medium enters the housing 211 through the liquid inlet 10, it first surrounds the battery cell 212 and then flows out through the liquid outlet 20, so that the battery cell 212 and the heat exchange channel 30 have a large contact area, ensuring the heat exchange effect between the battery cell 212 and the heat exchange medium.

[0060] Furthermore, such as Figure 8 and Figure 9As shown, the housing 211 also includes a third housing side plate 2115 and a fourth housing side plate 2116. The third housing side plate 2115 and the fourth housing side plate 2116 are arranged opposite to each other and are connected to the housing top plate 2114 and the housing bottom plate 2111, as well as the housing side plate 2112 and the housing side plate 2113. That is to say, the housing top plate 2114, housing bottom plate 2111, first housing side plate 2112, second housing side plate 2113, third housing side plate 2115, and fourth housing side plate 2116 form a cell receiving cavity, and the cell 212 is disposed in the cell receiving cavity. In addition, an explosion-proof valve is also provided on the housing 211. In this embodiment, the housing 211 is square, the top plate 2114 and the bottom plate 2111 of the housing are both perpendicular to the height direction of the housing 211, the first side plate 2112 and the second side plate 2113 of the housing are both perpendicular to the length direction of the housing 211, and the third side plate 2115 and the fourth side plate 2116 of the housing are both perpendicular to the width direction of the housing 211.

[0061] Furthermore, such as Figure 9 and Figure 11 As shown, the liquid inlet 10 and liquid outlet 20 on the bottom plate 2111 of the housing are spaced apart along the length of the housing 211. The first housing side plate 2112 and the second housing side plate 2113 are respectively located at both ends of the length of the housing 211. Preferably, the liquid inlet 10 and liquid outlet 20 are located at both ends of the length of the housing 211. When filling the heat exchange medium in each individual cell 21 after the battery pack is assembled, the battery pack can be placed vertically. In the vertically placed state, the length of each individual cell 21 is along the vertical direction, and the liquid inlet 10 of the same individual cell 21 is located below the liquid outlet 20. At this time, the heat exchange medium is introduced into each individual cell 21. The heat exchange medium enters the heat exchange channel 30 in the individual cell 21 through the liquid inlet 10 of the individual cell 21. The heat exchange medium gradually fills the heat exchange channel 30. During the process of filling the heat exchange channel 30, the air in the heat exchange channel 30 is gradually discharged from the liquid outlet 20. In this embodiment, a plastic film is covered on the liquid outlet connector 4, and a liquid outlet is opened on the plastic film. The cross-sectional area of ​​the liquid outlet is smaller than the cross-sectional area of ​​the inner hole of the liquid inlet connector 3, so as to facilitate the filling of heat exchange medium into the single cell 21.

[0062] Furthermore, such as Figure 11 and Figure 12As shown, the single battery 21 also includes a sealing element 213, which is disposed between the housing bottom plate 2111 and the cell 212. The first flow channel section 301 is located on the side of the sealing element 213 near the first housing side plate 2112, and the second flow channel section 302 is located on the side of the sealing element 213 near the second housing side plate 2113. That is to say, the sealing element 213 separates the first flow channel section 301 and the second flow channel section 302, preventing the heat exchange medium entering through the liquid inlet 10 from flowing directly to the liquid outlet 20 through the gap between the cell 212 and the housing bottom plate 2111. Furthermore, the sealing element 213 is an elastic element that can undergo elastic deformation, so that when the cell 212 expands and contracts during charging and discharging, the sealing element 213 can also ensure the seal between the cell 212 and the housing bottom plate 2111, thereby ensuring that the sealing element 213 effectively separates the first flow channel section 301 and the second flow channel section 302.

[0063] Optionally, such as Figures 10-13 As shown, the single battery 21 also includes a terminal post 214, which has a first end and a second end arranged opposite to each other. The first end of the terminal post 214 is exposed outside the housing 211, and the second end passes through the fourth flow channel section 304 and is connected to the cell 212. That is to say, the heat exchange medium in the fourth flow channel section 304 can surround the portion of the terminal post 214 located in the fourth flow channel section 304, so that the heat exchange medium can directly exchange heat with the terminal post 214, ensuring the temperature control effect of the terminal post 214, especially avoiding the problem of overheating of the terminal post 214 during the charging and discharging of the battery pack. Specifically, the specific arrangement of the terminal post 214 can be selected according to needs. For example, the cell 212 itself can be provided with tabs, and the terminal post 214 is located outside the cell 212 and electrically connected to the tabs. Alternatively, the terminal post 214 can pass through the encapsulation layer 2122 and be directly electrically connected to the electrode assembly 2121.

[0064] Furthermore, such as Figure 11 and Figure 13 As shown, a thermally conductive insulating layer 2141 is provided on the surface of the electrode post 214. The area of ​​the electrode post 214 located within the fourth flow channel section 304 is covered with the thermally conductive insulating layer 2141. The thermally conductive insulating layer 2141 serves both thermal conductivity and insulation functions. It separates the main body of the electrode post 214 from the heat exchange medium, preventing a short circuit caused by direct electrical connection between the two electrode posts 214 via the heat exchange medium, while ensuring the heat exchange effect between the main body of the electrode post 214 and the heat exchange medium. In this embodiment, the thermally conductive insulating layer 2141 is formed by spraying a thermally conductive insulating coating. In other embodiments, other methods can be used to fabricate the thermally conductive insulating layer 2141, as long as the thermal conductivity and insulation effects are achieved.

[0065] Optionally, such as Figure 2As shown, the battery pack provided in this embodiment also includes an elastic gasket 5, and the housing 1 also includes a housing side plate 12 and a housing cover plate 13. The housing cover plate 13 is disposed opposite to the housing bottom plate 11. The housing cover plate 13 covers the top of the housing side plate 12, and the housing bottom plate 11 is disposed at the bottom of the housing side plate 12. The receiving cavity 100 is formed by the housing bottom plate 11, the housing side plate 12 and the housing cover plate 13. The housing bottom plate 11 is disposed at the bottom of the housing side plate 12. An elastic gasket 5 is sandwiched between each single battery 21 and the housing cover plate 13. When the battery pack is assembled, the housing cover plate 13 compresses the elastic gasket 5. The restoring force of the elastic gasket 5 acts on each single battery 21, thereby pressing each single battery 21 tightly onto the housing bottom plate 11, making the connection between the single battery 21 and the liquid inlet connector 3 and the liquid outlet connector 4 more stable.

[0066] Furthermore, such as Figure 6 , Figure 7 and Figure 11 As shown, the outer walls of the liquid inlet connector 3 and the liquid outlet connector 4 are fixedly provided with buckles 7 extending along their own circumference. The walls of the liquid inlet hole 10 and the liquid outlet hole 20 are provided with slots 300 that cooperate with the buckles 7. The buckles 7 can prevent the liquid inlet connector 3 and the liquid outlet connector 4 from coming out of the housing 211, and further improve the connection stability between the single battery 21 and the liquid inlet connector 3 and the liquid outlet connector 4.

[0067] Optionally, such as Figure 6 , Figure 7 and Figure 11 As shown, the battery pack provided in this embodiment also includes a sealing ring 6. A sealing ring 6 is provided between the liquid inlet connector 3 and the liquid inlet hole 10 and between the liquid outlet connector 4 and the liquid outlet hole 20. The sealing ring 6 seals the gap between the liquid inlet connector 3 and the housing 211 and between the liquid outlet connector 4 and the housing 211, so as to prevent the heat exchange medium from flowing out from between the liquid inlet connector 3 and the housing 211 and between the liquid outlet connector 4 and the housing 211.

[0068] Furthermore, such as Figure 6 , Figure 7 and Figure 11 As shown, both the inlet connector 3 and the outlet connector 4 are provided with receiving grooves 200 extending circumferentially on their outer walls. The sealing ring 6 is at least partially embedded in the receiving groove 200 to prevent the sealing ring 6 from moving during the insertion of the single battery 21 into the box 1 and affecting the sealing effect.

[0069] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, include: The box (1) has an internal cavity (100) and the box (1) includes a box bottom plate (11); A battery pack (2) is disposed in the receiving cavity (100). The battery pack (2) includes a plurality of single cells (21) arranged in an array. Each single cell (21) includes a housing (211) and a cell (212) disposed in the housing (211). The housing (211) includes a housing bottom plate (2111) facing the bottom plate (11) of the housing. One of the box bottom plate (11) and the shell bottom plate (2111) is provided with a liquid inlet connector (3) and a liquid outlet connector (4), and the other is provided with a liquid inlet hole (10) corresponding to the liquid inlet connector (3) and a liquid outlet hole (20) corresponding to the liquid outlet connector (4); the liquid inlet connector (3) is inserted into the corresponding liquid inlet hole (10), and the liquid outlet connector (4) is inserted into the corresponding liquid outlet hole (20). The liquid inlet connector (3) is used to introduce heat exchange medium between the shell (211) and the battery cell (212), and the liquid outlet connector (4) is used to allow the heat exchange medium between the shell (211) and the battery cell (212) to flow out.

2. The battery pack according to claim 1, characterized in that, The liquid inlet (10) and the liquid outlet (20) are disposed on the single battery (21), and the liquid inlet connector (3) and the liquid outlet connector (4) are disposed on the bottom plate (11) of the housing.

3. The battery pack according to claim 2, characterized in that, The single cell (21) has a heat exchange channel (30) that connects the liquid inlet (10) and the liquid outlet (20).

4. The battery pack according to claim 3, characterized in that, The housing (211) further includes a first housing side plate (2112), a second housing side plate (2113), and a housing top plate (2114), wherein the housing top plate (2114) is disposed opposite to the housing bottom plate (2111); The first housing side plate (2112) and the second housing side plate (2113) are arranged opposite to each other and are both connected to the housing top plate (2114) and the housing bottom plate (2111); The heat exchange channel (30) includes a first channel section (301), a second channel section (302), a third channel section (303), a fourth channel section (304), and a fifth channel section (305). The first channel section (301) and the second channel section (302) are disposed between the bottom plate of the housing (2111) and the battery cell (212), and the third channel section (303) is disposed between the first side plate of the housing (2112) and the battery cell (212). The top plate (2114) and the battery cell (212) are provided with the fourth flow channel section (304), and the second housing side plate (2113) and the battery cell (212) are provided with the fifth flow channel section (305). The liquid inlet (10), the first flow channel section (301), the third flow channel section (303), the fourth flow channel section (304), the fifth flow channel section (305), the second flow channel section (302) and the liquid outlet (20) are connected in sequence.

5. The battery pack according to claim 4, characterized in that, The single battery (21) also includes a seal (213), which is disposed between the housing bottom plate (2111) and the cell (212). The first flow channel section (301) is located on the side of the seal (213) near the first housing side plate (2112), and the second flow channel section (302) is located on the side of the seal (213) near the second housing side plate (2113).

6. The battery pack according to claim 4, characterized in that, The liquid inlet (10) and liquid outlet (20) on the bottom plate (2111) of the housing are spaced apart along the length of the housing (211), and the first housing side plate (2112) and the second housing side plate (2113) are respectively located at both ends of the length of the housing (211).

7. The battery pack according to claim 4, characterized in that, The single battery (21) also includes a terminal post (214), which has a first end and a second end disposed opposite to each other. The first end of the terminal post (214) is exposed outside the housing (211), and the second end passes through the fourth flow channel section (304) and is connected to the cell (212).

8. The battery pack according to claim 7, characterized in that, The surface of the pole post (214) is provided with a thermally conductive insulating layer (2141), and the area of ​​the pole post (214) located within the fourth flow channel section (304) is covered with the thermally conductive insulating layer (2141).

9. The battery pack according to any one of claims 1-8, characterized in that, It also includes an elastic gasket (5), and the box body (1) also includes a box cover plate (13), the box cover plate (13) is disposed opposite to the box bottom plate (11), and the elastic gasket (5) is sandwiched between the single battery (21) and the box cover plate (13).

10. The battery pack according to any one of claims 1-8, characterized in that, It also includes a sealing ring (6), which is provided between the liquid inlet connector (3) and the liquid inlet hole (10) and between the liquid outlet connector (4) and the liquid outlet hole (20).

11. The battery pack according to claim 10, characterized in that, Both the liquid inlet connector (3) and the liquid outlet connector (4) are provided with receiving grooves (200) extending circumferentially on their outer walls, and the sealing ring (6) is at least partially embedded in the receiving grooves (200).

12. The battery pack according to any one of claims 1-8, characterized in that, Both the liquid inlet connector (3) and the liquid outlet connector (4) are fixedly provided with buckles (7) extending in their circumference, and both the liquid inlet hole (10) and the liquid outlet hole (20) are provided with slots (300) that cooperate with the buckles (7).

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