Cover plate assembly and battery pack

Abstract

The utility model discloses a cover plate assembly and a battery pack. The cover plate assembly comprises a cover body and a small cover plate. A concave cavity protruding towards the interior of the battery pack box body is formed in the cover body; the top of the concave cavity is open, and at least one through hole is formed in the bottom; the small cover plate is fixedly sealed at the open end of the concave cavity, so that a thermal runaway flue gas channel is formed in the battery pack; the at least one through hole needs to cover the explosion venting parts arranged at the tops of all the single batteries in the x direction in the battery pack, so that the inner cavity of the single battery with thermal runaway is communicated with the thermal runaway flue gas channel through the through hole. The cover plate assembly can be used as an upper cover of the battery pack, the concave cavity is formed in the upper cover, and the thermal runaway flue gas channel is formed after the concave cavity is blocked by the small cover plate, so that when thermal runaway occurs, flue gas can be orderly discharged out of the box body through the thermal runaway flue gas channel to be treated, and the thermal runaway flue gas can be discharged out of the box body. The problem that when an existing battery pack is subjected to thermal runaway, safety accidents are possibly caused is solved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a cover plate assembly and a battery pack. Background Technology

[0002] Currently, at least one battery string is installed in a box to form a battery pack.

[0003] However, individual cells in the battery pack may experience thermal runaway due to mechanical, electrical, or thermal abuse, as well as their own defects. If thermal runaway occurs and is not effectively handled, it can cause a safety accident and threaten the personal safety of people around the battery pack. Summary of the Invention

[0004] In order to address the safety hazards posed by thermal runaway in existing battery packs, the first aspect of this utility model provides a cover plate assembly.

[0005] The cover assembly includes a cover body and a small cover plate; the cover body has a recessed cavity protruding towards the battery pack housing; the top of the recessed cavity is open, and the bottom has at least one through hole; the small cover plate is fixedly sealed to the open end of the recessed cavity, thereby forming a thermal runaway flue gas channel inside the battery pack; the at least one through hole needs to cover the explosion vents on the top of all individual cells arranged in the x-direction inside the battery pack, ensuring that the inner cavity of the individual cell that experiences thermal runaway is connected to the thermal runaway flue gas channel through the through hole.

[0006] This cover assembly can not only be used as the top cover of the battery pack, but also has a cavity in the top cover. After the cavity is sealed by a small cover plate, a thermal runaway flue gas channel is formed. When thermal runaway occurs, the flue gas can be discharged to the outside of the box in an orderly manner through the thermal runaway flue gas channel for treatment, which solves the problem that existing battery packs may cause safety accidents when thermal runaway occurs.

[0007] Furthermore, thermal runaway substances are discharged through the thermal runaway flue gas channel of the cover plate assembly, which can reduce the fire protection requirements for the overall battery pack enclosure and save on the manufacturing cost of the battery pack to a certain extent.

[0008] Furthermore, a groove is provided around the edge of the opening at the concave cavity opening. The area enclosed by the groove has the same size and shape as the small cover plate. The small cover plate is fitted into the groove, ensuring that the top surface of the small cover plate is flush with the top surface of the cover body, thus saving the volume of the battery pack.

[0009] Furthermore, there are multiple through holes, and each through hole corresponds to the explosion venting section of a single battery cell. Compared to the solution of opening a single elongated through hole to cover the explosion venting sections of all single batteries, it is easier to ensure the sealing performance between the cavity and the single battery cell, and it is also easier to ensure the overall strength of the cover assembly.

[0010] Furthermore, in order to further ensure the sealing and pressure-bearing capacity of the thermal runaway flue gas passage, the small cover plate is fixedly sealed to the open end of the concave cavity by welding.

[0011] Another aspect of this utility model provides a battery pack, including a housing and one or more battery strings;

[0012] The battery string consists of multiple individual cells arranged in the box along the x-direction;

[0013] The enclosure includes a shell with an open top and a cover assembly that is fixedly sealed to the open end of the shell;

[0014] The cover assembly includes the cover body and the small cover plate;

[0015] The cover body has a recessed cavity that protrudes into the box;

[0016] The top of the cavity is open, the bottom of the cavity is sealed to the top cover of each individual battery, and at least one through hole is provided at the bottom of the cavity. A small cover plate is fixedly sealed to the open end of the cavity, thereby forming a thermal runaway flue gas channel inside the battery pack.

[0017] The at least one through hole satisfies the explosion venting section at the top of all individual cells in the battery string, ensuring that the inner cavity of the individual cell that experiences thermal runaway is connected to the thermal runaway flue gas channel through the through hole.

[0018] Furthermore, the number of through holes is consistent with the number of individual cells, and each through hole corresponds to the explosion vent of one individual cell. The periphery of each through hole is sealed to the periphery of the explosion vent on the top cover of the individual cell by welding or bonding. One advantage of this design is that it ensures the overall strength of the cover assembly. Another advantage is that, compared to a design that uses a single elongated through hole to cover the explosion vents of all individual cells, it is easier to ensure the sealing performance between the cavity and the individual cells.

[0019] Furthermore, it also includes a flexible plate, which is disposed between the bottom of the cavity and the top cover of each individual battery cell. The flexible plate has through holes corresponding to the position and number of through holes. When the dimensions of each individual battery cell differ in the height direction due to processing errors, and if the bottom plates of each individual battery cell are located on the same plane, the top covers of each individual battery cell will inevitably not be able to remain on the same plane. This invention can compensate for the height difference between the top covers of each individual battery cell by deforming the flexible plate and adjusting the thickness of the adhesive layer. In addition, placing the flexible plate between the top cover of the individual battery cell and the bottom of the cavity can act as a sealing gasket, further improving the sealing performance between the top cover of the individual battery cell and the bottom of the cavity.

[0020] Furthermore, it also includes a heat exchange device for temperature control of the polarity terminals of individual cells in the battery string.

[0021] Furthermore, the heat exchange device includes a first tube, a second tube, and a connecting tube; the first tube is fixed in the clamping part of the polarity terminal on one side of each individual battery; the second tube is used to fix in the clamping part of the polarity terminal on the other side of each individual battery; the two ends of the connecting tube are respectively connected to the ports of the first tube and the second tube on one side, and the connecting tube is located outside the housing; the ports of the first tube and the second tube on the other side serve as the heat exchange medium inlet and heat exchange medium outlet, respectively, and extend out of the housing.

[0022] Furthermore, in order to facilitate the installation of the heat exchange device on the battery string and to facilitate the electrical signal output of the battery string, a pair of notches for power supply connection and heat exchange device extension are provided on the two side walls of the housing that are parallel to the yz plane. Attached Figure Description

[0023] Figure 1 This is an external view of the battery pack in Example 1;

[0024] Figure 2 This is an exploded view of the battery pack in Example 1;

[0025] Figure 3 This is a cross-sectional view of Example 1;

[0026] Figure 4 This is an external view of the battery pack in Example 2;

[0027] Figure 5 This is an exploded view of the battery pack in Example 2;

[0028] Figure 6 This is a cross-sectional view of Example 2;

[0029] Figure 7 A cross-sectional view of the flexible plate is added to Example 2.

[0030] The attached figures are labeled as follows:

[0031] 100-Battery pack, 1-Box body, 11-Shell, 111-Notch, 12-Cover assembly, 121-Cover body, 122-Small cover plate, 123-Cavity, 124-Through hole, 125-Thermal runaway flue gas channel, 126-Groove, 13-Side wall, 2-Battery string, 21-Single cell, 3-Flexible plate, 31-Through hole, 4-Heat exchange device, 41-First pipe, 42-Second pipe, 43-Connecting pipe. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0033] The phrase "other embodiments" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0034] In this specification, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection, an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] Furthermore, in the description of this utility model, it should be noted that the terms "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] When a battery pack experiences thermal runaway, the existing thermal runaway handling methods include the following two:

[0037] Measure 1: This measure is currently widely used, specifically employing fire suppression media such as heptafluoropropane, perfluorohexanone, fine water mist, and aerosols to inhibit thermal runaway. However, this method requires the battery pack enclosure to have a high protection level. Furthermore, this fire suppression method is costly, especially when combined with the widely used perfluorohexanone extinguishing agent, which drastically increases the cost of handling thermal runaway.

[0038] Measure 2: When a single cell in the battery pack experiences thermal runaway, the thermal runaway fumes can be discharged outside the box for treatment. This method can reduce the cost of thermal runaway treatment. However, in this method, the thermal runaway propagates throughout the entire box space. Therefore, the pressure resistance and sealing (high protection) requirements of the battery pack box are relatively high, resulting in a higher cost for the battery pack. At the same time, thermal runaway of one single cell may lead to thermal runaway of other single cells, resulting in lower safety.

[0039] Since both of the above methods have their own problems, this utility model provides a battery pack, the design concept of which is:

[0040] The system cleverly utilizes the top cover of the battery pack, incorporating a thermal runaway venting channel. This channel covers the explosion vents on the top of all individual cells, ensuring communication between the internal cavity of the cell experiencing thermal runaway and the venting channel. This approach not only integrates the top cover as part of the battery pack housing but also allows for the orderly discharge of fumes outside the housing in the event of thermal runaway, reducing the overall fire safety requirements for the battery pack housing and potentially saving on manufacturing costs. Furthermore, it prevents the spread of thermal runaway within the housing, mitigating the associated risks.

[0041] Example 1

[0042] like Figures 1 to 3 As shown, the battery pack 100 includes a housing 1 and a battery string 2 disposed inside the housing 1;

[0043] The housing 1 includes a shell 11 and a cover assembly 12;

[0044] like Figure 2 As shown, the top of the shell 11 is open, and it is specifically formed by the surrounding side walls 13 and the bottom plate. The surrounding side walls 13 are two side walls parallel to the xz plane and two side walls parallel to the yz plane. The bottom plate is parallel to the xy plane. In this embodiment, the surrounding side walls 13 and the bottom plate are integrally formed. In some other embodiments, the surrounding side walls 13 and the bottom plate can be spliced ​​by welding.

[0045] In this embodiment, the cover plate assembly 12 includes a cover body 121 and a small cover plate 122;

[0046] The cover body 121 is provided with a recess 123 protruding into the box, and the cover body 121 is fixed to the open end of the shell 11;

[0047] like Figure 3As shown, the top of the cavity 123 is open, and the bottom of the cavity 123 is sealed to the top cover of each individual battery 21. At least one through hole 124 is provided at the bottom of the cavity 123. A small cover plate 122 is fixedly sealed to the open end of the cavity 123, thereby forming a thermal runaway flue gas channel 125 inside the battery pack. The at least one through hole 124 covers the explosion venting part on the top of all individual batteries 21 in the battery string 2, ensuring that the inner cavity of the individual battery 21 that has thermal runaway is connected to the thermal runaway flue gas channel 125 through the through hole. In this box structure, the thermal runaway flue gas channel 125 and the installation space of the battery string 2 are isolated from each other. Therefore, when a certain individual battery has thermal runaway, the thermal runaway material emitted will not affect the other individual batteries, greatly reducing the problem of thermal runaway propagation.

[0048] It should also be noted that:

[0049] 1. The explosion relief part of the single cell 21 can also be called the explosion-proof part of the single cell, pressure relief port, explosion-proof port, etc. It is mainly used to release thermal runaway smoke when the single cell experiences thermal runaway. In this embodiment, the explosion relief part is an explosion relief membrane.

[0050] 2. In this embodiment, a groove 126 is provided around the open edge of the cavity 123. The area enclosed by the groove 126 has the same size and shape as the small cover plate 122. During installation, the small cover plate 122 is embedded in the groove 126 and fixed by welding. Therefore, it can be ensured that the upper surface of the small cover plate 122 and the top surface of the cavity 123 are on the same plane. Compared with the method of directly fixing the small cover plate 122 to the top of the cavity 123, the height of the battery pack in the z direction is reduced to a certain extent, thereby saving the volume of the battery pack.

[0051] III. In this embodiment, there are multiple through holes 124, which are arranged along the x-direction of the cavity 123 and correspond one-to-one with the explosion venting part of each individual battery cell 21. When the through holes 124 correspond one-to-one with the explosion venting parts, in order to reduce the accuracy requirements between each through hole 124 and the corresponding explosion venting part during installation, the orthographic projection of each through hole 124 on the top cover of the individual battery cell 21 where the corresponding explosion venting part is located completely covers the explosion venting part. During installation, it is not required that the through holes and the explosion venting parts be concentric; it is only necessary to ensure that the through holes cover the explosion venting parts.

[0052] Compared to a single elongated hole as a through-hole, the arrangement of multiple through-holes ensures the strength of the cover plate body and the flatness of the bottom of the cavity, resulting in better sealing performance between the bottom of the cavity and the explosion venting parts of each individual battery cell.

[0053] IV. The bottom of the concave cavity 123 and the top cover of each individual battery 21 can be sealed using the following methods:

[0054] Method 1: The bottom of the cavity 123 and the top cover of each individual battery 21 are sealed and fixed by adhesive. Specifically, adhesive can be applied to the bottom of the cavity or the area around the explosion venting part of each individual battery top cover before the cover assembly is installed to the housing. After the cover assembly is installed, the bottom of the cavity and the top cover of each individual battery are bonded and sealed.

[0055] Method 2: The bottom of the cavity 123 is sealed and fixed to the top cover of each individual battery 21 by laser welding; the area of ​​laser welding is the area around the through hole and the area corresponding to the explosion vent of the individual battery.

[0056] Method 3: A flexible plate 3 is added between the bottom of the cavity 123 and the top cover of each individual battery 21. The flexible plate 3 is positioned between the bottom of the cavity 123 and the top cover of each individual battery 21, and has through holes 31 corresponding to the position and number of through holes 124. Due to processing errors, when the top covers of each individual battery 21 in the battery string 2 cannot be kept on the same plane, the deformation of the flexible plate 3 can compensate for the height difference between the top covers of each individual battery 21. In addition, placing the flexible plate 3 between the top cover of the individual battery 21 and the bottom of the cavity can be used as a sealing gasket, further improving the sealing performance between the top cover of the individual battery and the bottom of the cavity. To improve the reliability of the fixation of the flexible plate 3 between the bottom of the cavity 123 and the top cover of each individual battery 21, adhesive can be applied between the flexible plate 3 and the bottom of the cavity 123, and between the flexible plate 3 and the top cover of each individual battery 21. The flexible plate 3 is usually made of high-temperature resistant rubber or plastic, where high temperature usually refers to the battery thermal runaway temperature.

[0057] V. The following methods can be used to connect the cover plate assembly 12 and the housing 11:

[0058] 1. Both the cover plate assembly 12 and the housing 11 are made of aluminum alloy sheet. The cover plate assembly 12 is fixed to the open end of the housing 11 by welding or screw connection.

[0059] 2. The cover plate assembly 12 is made of aluminum alloy sheet, and the housing 11 is made of plastic material. The cover plate assembly 12 is fixed to the open end of the housing 11 by adhesive or screw connection.

[0060] Since thermal runaway flue gas enters the thermal runaway flue gas channel 125 of the cover plate assembly 12 after thermal runaway occurs, the requirements for the explosion-proof level and sealing level of the housing 11 itself can be reduced. Therefore, from the perspective of saving costs, the preferred connection method 2 between the cover plate assembly 12 and the housing 11 in this embodiment is preferred.

[0061] VI. The flue gas in the thermal runaway flue gas channel 125 needs to be discharged from the box and then treated by the thermal runaway flue gas treatment device. In this embodiment, an interface can be set on the small cover plate 122. The interface is connected to the thermal runaway flue gas treatment device through a connecting pipe. The interface can be a through hole, a pressure valve, or a venting diaphragm. Whether it is a pressure valve or a venting diaphragm, its opening pressure must be less than the pressure of the single battery venting part to ensure that the pressure valve or venting diaphragm can be opened smoothly after the thermal runaway flue gas enters the thermal runaway flue gas channel.

[0062] In some other embodiments, a pipe can also be provided, with one end located in the thermal runaway flue gas channel and the other end passing through the side wall of the cavity and the side wall of the shell in sequence before being led out of the box. However, compared to setting the interface on the small cover plate, this method is more complex in structure.

[0063] In this embodiment, the battery pack string 2 consists of multiple individual battery cells 21 arranged along the x-direction; the multiple individual battery cells 21 can be connected in series, in parallel, or in a series-parallel combination; the multiple individual battery cells 21 can be commercially available prismatic lithium-ion batteries.

[0064] Regardless of the electrical connection method used for the multiple individual cells 21, the entire battery pack requires a total positive output and a total negative output. Therefore, in this embodiment, a total positive terminal and a total negative terminal can be provided on the side wall parallel to the yz plane for connection with the positive and negative outputs of the battery string.

[0065] Example 2

[0066] like Figures 4 to 7 As shown, during normal operation, the battery pack 100 needs to control the temperature of each individual battery cell 21 in the battery string 2 to ensure that the battery pack can work reliably and safely for a long time. Therefore, a heat exchange device 4 is usually added to the battery pack; the so-called heat exchange device 4 can heat up or cool down the battery string 2.

[0067] Research has shown that the temperature at the polarity terminal of a single cell is the highest when it is heating up. Therefore, this embodiment provides a heat exchange device 4 that can exchange heat with the polarity terminals of each single cell 21, based on embodiment 1.

[0068] The heat exchange device 4 has two forms: the first form is indirect heat exchange, and the second form is direct heat exchange.

[0069] The indirect heat exchange device 4 includes a first tube 41, a second tube 42, and a connecting tube 43. The first tube 41 is fixed in the clamping part of the polar terminal on one side of each individual battery 21. The second tube 42 is fixed in the clamping part of the polar terminal on the other side of each individual battery 21. The two ends of the connecting tube 43 are respectively connected to the ports of the first tube 41 and the second tube 42 on one side, and the connecting tube 43 is located outside the housing 1. The ports of the first tube 41 and the second tube 42 on the other side serve as the heat exchange medium inlet and heat exchange medium outlet, respectively, to lead the heat exchange medium out of the housing 1.

[0070] The clamping part in this utility model can be a through hole or a groove in the polarity terminal. Compared with the through hole, the groove is easier to fit and install with the first tube and the second tube. Compared with the groove, the through hole has a larger contact surface with the first tube and the second tube, resulting in better temperature control.

[0071] To allow the heat exchange medium to exit the housing through the heat exchange medium inlet and outlet, this embodiment provides a pair of notches 111 on both side walls 13 of the shell 11 that are parallel to the yz plane. The notches 111 have the following advantages:

[0072] Firstly, the battery pack string 2 and the heat exchange device 4 can be assembled externally and placed directly into the housing 11, which improves assembly efficiency compared to setting through holes on the housing 11 for the first tube 41 and the second tube 42 to pass through, or setting connectors to connect with the first tube 41 and the second tube 42.

[0073] Secondly, since the heat exchange device 4 acts on the polarity terminal, the notch 111 facilitates the direct lead-out of the main positive and main negative terminals of the battery string 2 outside the casing. Compared with setting the main positive terminal connected to the main positive terminal of the battery string 2 and the main negative terminal connected to the main negative terminal on the casing, the lead-out of electrical signals is more convenient and the structure is simpler.

[0074] The heat exchange device 4 in the direct heat exchange form includes a connecting pipe assembly. Each individual cell has a channel through the polar terminal. The connecting pipe assembly connects the channels on the polar terminals of adjacent individual cells to form a heat exchange medium flow channel. The connecting pipe assembly and each individual cell polar terminal are kept sealed and insulated. In addition to the connecting pipe assembly between each adjacent polar terminal, two more connecting pipe assemblies are needed as the heat exchange medium inlet and heat exchange medium outlet to lead the heat exchange medium out of the box.

[0075] To facilitate the connection between the connecting pipe assembly and the polarity terminal, and to further improve the direct heat exchange effect, preferably, both ports of the channel are provided with fixing parts that are fixed to the side wall of the polarity terminal and connected to the connecting pipe assembly; the inner wall of the channel is provided with heat-conducting ribs to increase the heat exchange area.

[0076] Whether it is indirect or direct heat exchange, the polar terminals of the individual cells 21 are provided with clamping parts or channels. Therefore, the polar terminals of the individual cells must have a certain height. They can be self-made square lithium-ion batteries, but the terminals of the self-made square lithium-ion batteries need to be heightened. If commercially available individual cells are used for modification, the polar terminals of the individual cells can be a terminal adapter (the clamping parts or channels are all set on the terminal adapter) connected to the terminal of the commercially available square lithium-ion battery, and the overall structure of the individual cell terminal and the terminal adapter is used as the polar terminals of the individual cells.

[0077] In some embodiments, the heat exchange device 4 may also be the bottom plate of the housing 11, with a heat exchange medium flow channel provided inside the bottom plate. The bottom plate acts directly on the bottom of each individual battery housing as a heat exchange device.

Claims

1. A cover assembly, serving as a top cover for a battery pack, characterized in that, Includes the cover body and the small cover plate; The cover body is provided with a recessed cavity protruding towards the battery pack box; the top of the recessed cavity is open and the bottom is provided with at least one through hole; the small cover plate is fixedly sealed to the open end of the recessed cavity, thereby forming a thermal runaway flue gas channel inside the battery pack. The at least one through hole needs to cover the explosion vents on the top of all individual cells arranged in the x-direction within the battery pack, ensuring that the inner cavity of the individual cell that experiences thermal runaway is connected to the thermal runaway flue gas channel through the through hole.

2. The cover plate assembly according to claim 1, characterized in that, A groove is provided around the edge of the opening at the concave cavity opening, and the area enclosed by the groove is the same size and shape as the small cover plate.

3. The cover plate assembly according to claim 1, characterized in that, There are multiple through holes, and each through hole is used for the explosion venting section of a single battery cell.

4. The cover plate assembly according to claim 1, characterized in that, The small cover plate is fixed and sealed to the open end of the cavity by welding.

5. A battery pack, characterized in that, Includes the casing and a battery pack string; The battery string consists of multiple individual cells arranged in the box along the x-direction; The enclosure includes a shell with an open top and a cover assembly that is fixedly sealed to the open end of the shell; The cover assembly includes the cover body and the small cover plate; The cover body has a recessed cavity that protrudes into the box; The top of the cavity is open, the bottom of the cavity is sealed to the top cover of each individual battery, and at least one through hole is provided at the bottom of the cavity. A small cover plate is fixedly sealed to the open end of the cavity, thereby forming a thermal runaway flue gas channel inside the battery pack. The small cover plate is provided with an interface for connecting the thermal runaway flue gas channel and the external thermal runaway treatment device. The at least one through hole satisfies the explosion venting section at the top of all individual cells in the battery string, ensuring that the inner cavity of the individual cell that experiences thermal runaway is connected to the thermal runaway flue gas channel through the through hole.

6. The battery pack according to claim 5, characterized in that, The number of through holes is the same as the number of individual cells, and each through hole corresponds to the explosion vent of one individual cell. The area around each through hole is sealed to the area around the explosion vent on the top cover of the individual cell by welding or bonding.

7. The battery pack according to claim 5, characterized in that, It also includes a flexible plate, which is set between the bottom of the cavity and the top cover of each individual battery cell. The flexible plate has through holes corresponding to the position and number of through holes.

8. The battery pack according to any one of claims 5 to 7, characterized in that, It also includes a heat exchange device for temperature control of the polarity terminals of individual cells in the battery string.

9. The battery pack according to claim 8, characterized in that, The heat exchange device includes a first tube, a second tube, and a connecting tube; The first tube is fixed in the clamping part of the polarity terminal on one side of each individual battery cell; the second tube is used to fix in the clamping part of the polarity terminal on the other side of each individual battery cell; the two ends of the connecting tube are respectively connected to the ports of the first tube and the second tube on one side, and the connecting tube is located outside the casing; the ports of the first tube and the second tube on the other side serve as the heat exchange medium inlet and heat exchange medium outlet, respectively, and extend out of the casing.

10. The battery pack according to claim 9, characterized in that, On the two side walls of the shell that are parallel to the yz plane, there are a pair of notches with power supply connectors and heat exchange devices extending outwards.

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