A heat exchange module, a battery box body and a battery pack

Abstract

The present invention relates to the technical field of electric energy storage, and specifically discloses a heat exchange module, a battery box body and a battery pack, including: a heat exchange main body, the heat exchange main body is provided with a flow channel for coolant to flow through, and a plurality of liquid outlet windows communicating the flow channel to the outside of the heat exchange main body; a weak part, a plurality of the weak parts are arranged in one-to-one correspondence with the respective liquid outlet windows, and the weak part is connected to the heat exchange main body, and the weak part is used for sealing the corresponding liquid outlet window. The heat exchange module, the battery box body and the battery pack provided by the present invention can effectively solve the problem that the coolant of the existing battery pack cannot directly flow to the battery cells to cool the battery cells during thermal runaway, resulting in a long cooling time for the battery cells.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy storage, and particularly to a heat exchange module, a battery box body and a battery pack. Background Art

[0002] With the rapid development of the new energy vehicle industry, as the power supply system of electric vehicles, the safety of battery packs has always been the focus of attention in the industry.

[0003] A battery pack generally includes a battery box body, a plurality of battery cells located inside the battery box body, a bus bar electrically connecting the battery cells, and a heat exchange module for exchanging heat with each battery cell. When a battery pack undergoes thermal runaway, a large amount of high-temperature gas and impurities ejected need to be discharged in time.

[0004] In the existing structure, once a single battery cell in the battery pack undergoes thermal runaway, its ejecta will fill the entire battery box body. If the ejecta adheres to the bus bar of the battery pack, it will pose a short-circuit risk; or if it falls on other battery cells, it may cause thermal runaway of other battery cells.

[0005] In the prior art, a heat exchange module for exchanging heat with battery cells is usually provided inside the battery pack, and there is usually a coolant flowing inside the heat exchange module. However, when thermal runaway occurs, the coolant in the heat exchange module cannot directly flow to the thermally runaway battery cell. When a battery cell undergoes thermal runaway, one can only wait for the thermally runaway battery cell to cool naturally, and the cooling process takes a long time.

[0006] Therefore, it is necessary to improve the existing battery pack to solve the problem that the coolant in the heat exchange module cannot directly flow to the battery cell to cool the battery cell during thermal runaway, resulting in a long cooling time for the battery cell.

[0007] The above information disclosed in this background section is only included to enhance the understanding of the background of the present disclosure, and thus may include information that does not form the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0008] An object of the present invention is to provide a heat exchange module, a battery box body and a battery pack, which can effectively solve the problem that the coolant in the existing battery pack cannot directly flow to the battery cell to cool the battery cell during thermal runaway, resulting in a long cooling time for the battery cell.

[0009] To achieve the above object, on the one hand, the present invention provides a heat exchange module, including:

[0010] A heat exchange main body, the heat exchange main body is provided with a flow channel for the coolant to flow through, and a plurality of liquid outlet windows communicating the flow channel to the outside of the heat exchange main body;

[0011] Weak parts, a plurality of the weak parts are arranged in one-to-one correspondence with the respective liquid outlet windows, and the weak parts are connected to the heat exchange main body, and the weak parts are used to seal the corresponding liquid outlet windows.

[0012] Optionally, the heat exchange main body includes two oppositely arranged manifold blocks and a heat exchange plate connecting the two manifold blocks;

[0013] Wherein, a plurality of the liquid outlet windows are provided on one side of the manifold block along the Z direction, and an inlet and outlet pipe communicating with the flow channel is provided on the other side along the Z direction.

[0014] Optionally, the wall thickness dimension of the heat exchange main body is greater than the wall thickness dimension of the weak part, and / or the melting point of the heat exchange main body is higher than the melting point of the weak part.

[0015] On the other hand, a battery box body is provided, including the heat exchange module described above, and further including:

[0016] A box body main body, and the box body main body is provided with an accommodation space;

[0017] Longitudinal partitions, two of the longitudinal partitions are relatively spaced apart in the Y direction in the accommodation space, and divide the accommodation space into an intermediate battery compartment for placing battery cells and edge spaces located on both sides of the intermediate battery compartment in the X direction;

[0018] A transverse partition, the transverse partition is located in the edge space, and divides the edge space into a connected upper space and a lower chamber in the Z direction;

[0019] Wherein,

[0020] Each of the longitudinal partitions is provided with a longitudinal through groove that communicates the lower chamber to the intermediate battery compartment and allows the ejecta of the corresponding battery cell to pass through;

[0021] The transverse partition is provided with a transverse through groove that communicates the upper space and the lower chamber and allows the ejecta to pass through at positions corresponding to the respective weak parts.

[0022] Optionally, the longitudinal partition is further connected with a guide plate extending from the notch of the longitudinal through groove to below the transverse through groove;

[0023] One end of the guide plate away from the longitudinal through groove is curved, so that the guide plate forms a groove structure relative to the longitudinal partition, and the guide plate is used to collect the coolant flowing out from the liquid outlet window of the manifold block when the weak part falls off.

[0024] Optionally, it further includes a box body explosion-proof valve communicating with the lower chamber.

[0025] In another aspect, a battery pack is provided, including any of the heat exchange modules described above, the battery box body, and a plurality of battery cells located within the battery box body;

[0026] Wherein, each of the battery cells is installed in the middle battery compartment of the battery box body, and an explosion-proof film is provided at the end face position corresponding to each battery cell in the longitudinal through groove.

[0027] Optionally, a one-way valve is provided between each explosion-proof film and the corresponding longitudinal through groove;

[0028] Wherein, the opening direction of the one-way valve is from the middle battery compartment to the lower chamber.

[0029] Optionally, the one-way valve includes:

[0030] A valve frame, which is fixedly installed on the longitudinal partition board and is provided with a one-way channel connecting the longitudinal through groove to the corresponding explosion-proof film;

[0031] A baffle shaft, which is installed in the valve frame;

[0032] A sealing baffle, which is rotatably installed around a horizontal axis in the baffle shaft;

[0033] A limiting member, which is located on the side of the sealing baffle close to the battery cell and is used to limit the rotation of the sealing baffle towards the battery cell.

[0034] Optionally, an insulating sealing ring is provided between the valve frame and the corresponding battery cell;

[0035] Wherein, the size of the insulating sealing ring is larger than the size of the explosion-proof film, so that the insulating sealing ring wraps the edge of the explosion-proof film.

[0036] The beneficial effect of the present invention is as follows: A heat exchange module, a battery box body and a battery pack are provided. When the battery cells in the battery pack have a thermal runaway and eject ejecta outward, since the structural strength of the weak part is weaker than that of the heat exchange main body, the ejecta will first damage the weak part and break through the liquid outlet window; the coolant in the flow channel can flow to the out-of-control battery cell through the liquid outlet window, directly cooling and lowering the temperature of the battery cell, and greatly reducing the cooling time of the battery cell.

[0037] Therefore, the heat exchange module, the battery box body and the battery pack provided by the present invention can effectively solve the problem that the coolant of the existing battery pack cannot directly flow to the battery cell to cool down the battery cell during thermal runaway, resulting in a longer cooling time of the battery cell. Description of the Drawings

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0039] Figure 1 Schematic structural diagram of the battery pack provided for the embodiment;

[0040] Figure 2 For Figure 1 explosion schematic diagram;

[0041] Figure 3 Schematic cross-sectional view of the battery pack provided for the embodiment;

[0042] Figure 4 For Figure 3 explosion schematic diagram;

[0043] Figure 5 Schematic partial cross-sectional view of the battery pack provided for the embodiment;

[0044] Figure 6 Schematic bottom view of the heat exchange module provided for the embodiment;

[0045] Figure 7 Schematic diagram when the one-way valve is closed provided for the embodiment;

[0046] Figure 8 Schematic diagram when the one-way valve is open provided for the embodiment.

[0047] In the figure:

[0048] 1. Heat exchange module; 101. Heat exchange main body; 1011. Current collector block; 1011a. Liquid outlet window; 1011b. Coolant inlet pipe; 1011c. Coolant outlet pipe; 1012. Heat exchange plate; 102. Weak part;

[0049] 2. Battery box body; 201. Box body main body; 2011. Intermediate battery compartment; 2012. Upper space; 2013. Lower chamber; 202. Longitudinal partition; 2021. Longitudinal through groove; 203. Transverse partition; 2031. Transverse through groove; 204. Guide plate; 205. Box body explosion-proof valve;

[0050] 3. Battery cell;

[0051] 4. Bus bar;

[0052] 5. Box body top cover;

[0053] 6. Heat conduction layer;

[0054] 7. Sealing gasket;

[0055] 8. Check valve; 801. Valve frame; 802. Baffle shaft; 803. Sealing baffle; 804. Limiting part;

[0056] 9. Insulating sealing ring. Detailed implementation manners

[0057] In the present invention, referring to "embodiment" means that specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the present invention. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in the present invention, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0058] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the technical field to which the present invention belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit the present invention.

[0059] In the description of the present invention, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that there can be three relationships. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " in this article generally represents an "or" logical relationship between the associated objects before and after.

[0060] In the present invention, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary-secondary or order relationship between these entities or operations.

[0061] Without more limitations, in the present invention, the expressions such as "comprising", "including", "having" or other similar expressions used in the statements are intended to cover non-exclusive inclusion. These expressions do not exclude that there may be other elements in the process, method or product including the said elements, so that the process, method or product including a series of elements may not only include those defined elements, but also include other elements not explicitly listed, or also include elements inherent to this process, method or product.

[0062] Similar to the understanding in the "Examination Guidelines", in the present invention, expressions such as "greater than", "less than", "exceeding", etc. are understood not to include the base number; expressions such as "above", "below", "within", etc. are understood to include the base number. In addition, in the description of the embodiments of the present invention, the meaning of "a plurality of" is two or more (including two), and similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in this way unless otherwise specifically limited.

[0063] In the description of the embodiments of the present invention, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the specific embodiment or the drawing, and is only for the convenience of describing the specific embodiments of the present invention or for the reader to understand, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, so it cannot be understood as a limitation to the embodiments of the present invention.

[0064] Unless otherwise clearly specified or limited, in the description of the embodiments of the present invention, the terms "installed", "connected", "connected", "fixed", "set", etc. should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two components or the interaction relationship between two components. For those skilled in the art to which the present invention pertains, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0065] The present invention provides a heat exchange module, a battery box body, and a battery pack, which are applicable to the application scenario of quickly cooling and reducing the temperature of a thermal runaway battery cell, and can effectively solve the problem that the coolant of the existing battery pack cannot directly flow to the battery cell during thermal runaway to cool the battery cell, resulting in a long cooling time for the battery cell.

[0066] See Figure 1 and Figure 2 , the battery pack provided in this embodiment includes a heat exchange module 1, a battery box body 2 for accommodating the heat exchange module 1, several battery cells 3 located below the heat exchange module 1, a bus bar 4 electrically connecting each of the battery cells 3, and a box body top cover 5 located above the battery box body 2 and cooperating with the battery box body 2 to surround and cover each of the battery cells 3.

[0067] See Figures 3 to 5, the battery box body 2 includes a box body main body 201, a longitudinal partition 202, and a transverse partition 203. The box body main body 201 is provided with an accommodation space. The two longitudinal partitions 202 are relatively spaced in the Y direction in the accommodation space, and divide the accommodation space into an intermediate battery compartment 2011 for placing the battery cells 3 and edge spaces located on both sides of the intermediate battery compartment 2011 in the X direction. The transverse partition 203 is located in the edge space and divides the edge space into a connected upper space 2012 and a lower chamber 2013 in the Z direction.

[0068] Among them, referring to Figure 6 , the heat exchange module 1 includes a heat exchange main body 101, and the heat exchange main body 101 is provided with a flow channel for the coolant to flow through and a plurality of liquid outlet windows 1011a communicating the flow channel to the outside of the heat exchange main body 101. The heat exchange module 1 further includes a plurality of weak parts 102 arranged in one-to-one correspondence with the liquid outlet windows 1011a, and the weak parts 102 are connected to the heat exchange main body 101 for sealing the corresponding liquid outlet windows 1011a.

[0069] Optionally, the heat exchange main body 101 includes two relatively arranged current collector blocks 1011 (the current collector blocks 1011 are located in the upper space 2012) and a heat exchange plate 1012 connecting the two current collector blocks 1011; wherein, a plurality of the liquid outlet windows 1011a are provided on one side of the current collector block 1011 in the Z direction, and an inlet and outlet pipe communicating with the flow channel is provided on the other side in the Z direction. Correspondingly, the box body top cover 5 is provided with a pipe passing hole for each inlet and outlet pipe to pass through at the position corresponding to each inlet and outlet pipe.

[0070] Specifically, one of the inlet and outlet pipes is a coolant inlet pipe 1011b, and the other inlet and outlet pipe is a coolant outlet pipe 1011c. The coolant enters the corresponding current collector block 1011 through the coolant inlet pipe 1011b, then flows through the heat exchange plate 1012 to exchange heat with each battery cell 3, and finally flows out through the coolant outlet pipe 1011c on the other current collector block 1011.

[0071] Optionally, a heat conduction layer 6 for reducing the heat transfer thermal resistance is provided between the heat exchange plate 1012 and each battery cell 3.

[0072] Furthermore, a sealing gasket 7 is provided between the current collector block 1011 and the transverse partition 203, which can not only prevent the coolant from leaking out through the gap between the current collector block 1011 and the transverse partition 203, but also prevent the high-temperature and high-pressure ejecta in the lower chamber 2013 from escaping from the lower chamber 2013.

[0073] In this embodiment, for each of the battery cells 3, the longitudinal partition 202 is provided with a longitudinal through groove 2021 that communicates the lower chamber 2013 with the intermediate battery compartment 2011 and allows the ejecta of the corresponding battery cell 3 to pass through. Corresponding to the positions of the respective weak parts 102, the transverse partition 203 is provided with a transverse through groove 2031 that communicates the upper space 2012 and the lower chamber 2013 and allows the ejecta to pass through.

[0074] The heat exchange module 1, the battery box body 2 and the battery pack provided in this embodiment have the following working principles:

[0075] ① Usually, the coolant enters the corresponding manifold 1011 through the coolant inlet pipe 1011b, then flows through the heat exchange plate 1012 to exchange heat with each battery cell 3, and finally flows out through the coolant outlet pipe 1011c on another manifold 1011, thereby realizing the conventional heat exchange operation;

[0076] ② When a thermal runaway occurs in the battery cells 3 in the battery pack and ejecta is ejected outward, the ejecta inside the battery cell 3 breaks through the explosion-proof sheet and sprays out, enters the lower chamber 2013 through the longitudinal through groove 2021, and then rushes towards the weak part 102 at the bottom of the manifold 1011 through the transverse through groove 2031;

[0077] Since the structural strength of the weak part 102 is weaker than that of the heat exchange main body 101, the ejecta will first damage the weak part 102 and break open the liquid outlet window 1011a; at this time, the coolant in the flow channel can flow to the out-of-control battery cell 3 through the liquid outlet window 1011a, the transverse through groove 2031, and the longitudinal through groove 2021 in sequence, directly cooling and lowering the temperature of the battery cell 3, and greatly reducing the cooling time of the battery cell 3.

[0078] Therefore, the heat exchange module 1, the battery box body 2 and the battery pack provided by the present invention can effectively solve the problem that the coolant of the existing battery pack cannot directly flow to the battery cell 3 to cool down the battery cell 3 during thermal runaway, resulting in a longer cooling time for the battery cell 3.

[0079] Optionally, in this embodiment, the structural strength of the heat exchange main body 101 is greater than that of the weak part 102, and the weak part 102 can melt and / or fall off under the action of high-temperature and high-pressure gas, and the coolant inside the cold plate can flow out from the liquid outlet window 1011a, including but not limited to the following structural forms:

[0080] ① The heat exchange main body 101 and the weak part 102 are made of the same material, but the wall thickness dimension of the heat exchange main body 101 is greater than the wall thickness dimension of the weak part 102;

[0081] ② The heat exchange main body 101 is made of a material with a higher melting point, such as metal; the weak part 102 is made of a material with a lower melting point, such as plastic.

[0082] In this embodiment, refer to Figure 5 , the longitudinal partition 202 is further connected with a guide plate 204 extending from the notch of the longitudinal through groove 2021 to the lower part of the transverse through groove 2031. Wherein, the guide plate 204 is used for guiding the diversion of the ejecta and the coolant between the longitudinal through groove 2021 and the transverse through groove 2031. Specifically, on the one hand, the guide plate 204 is used for guiding the ejecta flowing through the longitudinal through groove 2021 to flow upward to the transverse through groove 2031, so as to break through the weak part 102; on the other hand, when the weak part 102 is broken through, the coolant flows downward and will first flow onto the guide plate 204, and then flow to the longitudinal through groove 2021 under the guiding action of the guide plate 204.

[0083] Optionally, the guide plate 204 is in an arc structure or an L-shaped structure with rounded corners, and this embodiment does not limit this.

[0084] It should be noted that even if the guide plate 204 is not provided, when the liquid level of the coolant in the lower chamber 2013 is higher than the longitudinal through groove 2021, it will also flow to the corresponding out-of-control battery cell 3. Therefore, the setting of the guide plate 204 can enable the coolant to flow to the longitudinal through groove 2021 without filling the entire lower chamber 2013, thereby accelerating the speed of the coolant flowing to the battery cell 3.

[0085] In this embodiment, the battery box body 2 further includes a box body explosion-proof valve 205 communicated with the lower chamber 2013. When the air pressure in the lower chamber 2013 is too high, it will also break through the box body explosion-proof valve 205 to release pressure outward.

[0086] Optionally, a one-way valve 8 with vulnerable properties is provided between each explosion-proof sheet and the corresponding longitudinal through groove 2021; wherein, the opening direction of the one-way valve 8 is from the middle battery compartment 2011 to the lower chamber 2013. Therefore, when thermal runaway occurs, the ejecta inside the out-of-control battery cell 3 can easily break through the one-way valve 8 and then enter the lower chamber 2013, and then break through the weak part 102, so that the coolant flows downward; when the coolant flows to each longitudinal through groove 2021, only the one-way valve 8 corresponding to the out-of-control battery cell 3 is damaged, so the coolant can enter the inside of the out-of-control battery cell 3 through the damaged one-way valve 8 to directly cool and lower the temperature of the battery cell 3; for the battery cells 3 that do not have thermal runaway, the corresponding one-way valve 8 has two isolation functions: first, it isolates the ejecta in the lower chamber 2013 to prevent the ejecta from reversely entering the middle battery compartment 2011 through the one-way valve 8 and causing thermal runaway of other battery cells 3; second, it isolates the coolant to prevent the coolant from flowing to the battery cells 3 that do not have thermal runaway.

[0087] In this embodiment, refer to Figure 7, the one-way valve 8 includes a valve frame 801, a baffle shaft 802, a sealing baffle 803, and a limiting member 804. The valve frame 801 can be installed and fixed on the longitudinal partition 202 by rivets or the like, and is provided with a one-way passage connecting the longitudinal through groove 2021 to the corresponding explosion-proof sheet; the baffle shaft 802 is installed in the valve frame 801; the sealing baffle 803 is rotatably installed on the baffle shaft 802 around a horizontal axis; the limiting member 804 is located on the side of the sealing baffle 803 close to the battery cell 3 and is used to limit the rotation of the sealing baffle 803 towards the battery cell 3.

[0088] When the battery cell 3 undergoes thermal runaway, the high-temperature and high-pressure ejecta can easily push the sealing baffle 803 to rotate towards the lower chamber 2013, and then enter the lower chamber 2013 and break through the weak part 102; it should be noted that the structure of the baffle shaft 802 and / or the sealing baffle 803 is relatively fragile, and it is easily damaged or deformed significantly when directly impacted by the high-temperature and high-pressure ejecta head-on (after the high-temperature and high-pressure ejecta enter the lower chamber 2013, the temperature and pressure both decrease. When the cooled and depressurized ejecta wants to rush from the lower chamber 2013 to the middle battery compartment 2011, the impact force has already decreased significantly, and coupled with the blocking effect of the limiting member 804, the one-way valve 8 will not be damaged), thereby causing the sealing baffle 803 to lose the sealing effect on the one-way passage. Therefore, the subsequent coolant can flow to the out-of-control battery cell 3 through the one-way passage.

[0089] Or, in some other embodiments, refer to Figure 8 , the frictional resistance between the sealing baffle 803 and the valve frame 801 is relatively large. After the ejecta flushes the sealing baffle 803 to a horizontal or inclined state, the self-gravity of the sealing baffle 803 is not sufficient to overcome the frictional resistance between the sealing baffle 803 and the valve frame 801. Therefore, the sealing baffle 803 cannot automatically reset to the vertical state under the action of gravity, so the coolant can flow to the out-of-control valve core through the one-way passage.

[0090] Optionally, an insulating sealing ring 9 is provided between the valve frame 801 and the corresponding battery cell 3; wherein, the size of the insulating sealing ring 9 is larger than the size of the explosion-proof sheet, so that the insulating sealing ring 9 wraps the edge of the explosion-proof sheet to prevent the ejecta and the coolant from leaking outwards.

[0091] In summary, the heat exchange module 1, the battery box 2, and the battery pack provided in this embodiment have the following advantages:

[0092] ①Under normal circumstances, the heat exchange module 1 performs routine heat exchange operations on each battery cell 3; when a thermal runaway occurs in the battery cell 3 and ejecta is sprayed outwards, the weak part 102 of the heat exchange module 1 is damaged, and the coolant can flow to the out-of-control battery cell 3 to directly cool down the battery cell 3, greatly reducing the cooling time of the battery cell 3;

[0093] ②The one-way valve 8 is used to separately connect the explosion-proof sheet of each battery cell 3 to the lower chamber 2013, thereby preventing the ejecta of the out-of-control battery cell 3 from being sprayed onto other battery cells 3 and causing thermal spread;

[0094] ③A guide plate 204 is provided that extends from the notch of the longitudinal through groove 2021 to below the transverse through groove 2031 to accelerate the flow rate of the coolant to the battery cell 3.

[0095] Finally, it should be noted that although the above embodiments have been described in the text and drawings of the specification of the present application, the patent protection scope of the present application cannot be limited thereby. Any technical solutions obtained by equivalent structure or equivalent process substitution or modification based on the essential concept of the present application and using the content recorded in the text and drawings of the specification of the present application, as well as the technical solutions of the above embodiments directly or indirectly implemented in other related technical fields, are all included in the patent protection scope of the present application.

Claims

1. A battery pack, characterized in that, It includes a heat exchange module (1), a battery box body (2), and a plurality of battery cells (3) located inside the battery box body (2); The heat exchange module includes: A heat exchange main body (101) provided with a flow channel for the coolant to flow through and a plurality of liquid outlet windows (1011a) connecting the flow channel to the outside of the heat exchange main body (101); Weak parts (102), a plurality of the weak parts (102) are arranged in one-to-one correspondence with the respective liquid outlet windows (1011a) and are connected to the heat exchange main body (101), and the weak parts (102) are used to seal the corresponding liquid outlet windows (1011a); The battery box body (2) includes: A box body main body (201) provided with an accommodation space; Longitudinal partitions (202), two of the longitudinal partitions (202) are relatively spaced in the Y direction in the accommodation space and divide the accommodation space into an intermediate battery compartment (2011) for placing the battery cells (3) and edge spaces located on both sides of the intermediate battery compartment (2011) in the X direction; A transverse partition (203) located in the edge space divides the edge space into an upper space (2012) and a lower chamber (2013) communicating with each other in the Z direction; Wherein, Each of the longitudinal partitions (202) is provided with a longitudinal through groove (2021) corresponding to each battery cell (3) for connecting the lower chamber (2013) to the intermediate battery compartment (2011) and allowing the ejecta of the corresponding battery cell (3) to pass through; The transverse partition (203) is provided with a transverse through groove (2031) corresponding to the positions of the respective weak parts (102) for connecting the upper space (2012) and the lower chamber (2013) and allowing the ejecta to pass through; Each of the battery cells (3) is installed in the intermediate battery compartment (2011) of the battery box body (2), and an explosion-proof film is provided at the position of each battery cell (3) corresponding to the longitudinal through groove (2021); A one-way valve (8) with a vulnerable property is provided between each explosion-proof film and the corresponding longitudinal through groove (2021). When thermal runaway occurs, the ejecta inside the thermally runaway battery cell (3) breaks through the one-way valve (8), then enters the lower chamber (2013), and further breaks through the weak part (102), causing the coolant to flow downward; when the coolant flows downward to each longitudinal through groove (2021), the one-way valve (8) corresponding to the thermally runaway battery cell (3) is damaged, and the coolant enters the inside of the thermally runaway battery cell (3) through the damaged one-way valve (8) to directly cool and lower the temperature of the battery cell (3); the one-way valves (8) corresponding to the battery cells (3) without thermal runaway isolate the ejecta and coolant in the lower chamber (2013).

2. The battery pack according to claim 1, wherein The heat exchange main body (101) includes two relatively arranged current collector blocks (1011) and a heat exchange plate (1012) connecting the two current collector blocks (1011); Among them, several of the liquid outlet windows (1011a) are provided on one side of the current collector block (1011) along the Z direction, and a liquid inlet and outlet pipe communicating with the flow channel is provided on the other side along the Z direction.

3. The battery pack according to claim 1, wherein The wall thickness dimension of the heat exchange main body (101) is greater than that of the weak part (102), and / or the melting point of the heat exchange main body (101) is higher than that of the weak part (102).

4. The battery pack according to claim 1, wherein, The longitudinal partition plate (202) is further connected with a guide plate (204) extending from the notch of the longitudinal through groove (2021) to the lower part of the transverse through groove (2031); One end of the guide plate (204) far from the longitudinal through groove (2021) is curved, so that the guide plate (204) forms a groove structure relative to the longitudinal partition plate (202). The guide plate (204) is used to collect the coolant flowing out of the liquid outlet window (1011a) of the current collector block (1011) when the weak part (102) falls off.

5. The battery pack according to claim 1, characterized in that, It further includes a box explosion-proof valve (205) communicating with the lower chamber (2013).

6. The battery pack according to claim 1, characterized in that, The opening direction of the one-way valve (8) is from the middle battery compartment (2011) to the lower chamber (2013).

7. The battery pack according to claim 6, wherein The one-way valve (8) includes: A valve frame (801), the valve frame (801) is installed and fixed on the longitudinal partition plate (202), and is provided with a one-way channel connecting the longitudinal through groove (2021) to the corresponding explosion-proof film; A baffle shaft (802), the baffle shaft (802) is installed in the valve frame (801); A sealing baffle (803), the sealing baffle (803) is rotatably installed around a horizontal axis in the baffle shaft (802); A limiting member (804), the limiting member (804) is located on the side of the sealing baffle (803) close to the battery cell (3), and is used to limit the rotation of the sealing baffle (803) towards the battery cell (3).

8. The battery pack according to claim 7, characterized in that, An insulating sealing ring (9) is provided between the valve frame (801) and the corresponding battery cell (3); Among them, the size of the insulating sealing ring (9) is larger than that of the explosion-proof film, so that the insulating sealing ring (9) wraps the edge of the explosion-proof film.

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