Battery cell structure and battery pack

Abstract

The application relates to the technical field of batteries, and discloses a battery cell structure and a battery pack, the battery cell structure comprising: a first battery cell comprising a first step portion and a second step portion, one side of the first step portion being provided with a pole, and one side of the second step portion being provided with an explosion-proof valve; a second battery cell being arranged in pairs along a second direction with the first battery cell; the second battery cell comprising a third step portion and a fourth step portion, the fourth step portion being adapted to be overlapped with the second step portion; one side of the fourth step portion facing the second step portion along a first direction being provided with the explosion-proof valve, and one side of the fourth step portion away from the explosion-proof valve along the first direction being provided with the pole. The battery cell structure and the battery pack provided by the application improve the modal and thermal management performance of the battery pack.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a cell structure and a battery pack. Background Technology

[0002] With the accelerated industrialization of the power electric vehicle industry, the safety design of battery packs has become a hot research topic. However, the modal and thermal management performance of existing battery packs needs improvement. Summary of the Invention

[0003] In view of this, the present invention provides a cell structure and a battery pack to address the problem that the modal and thermal management performance of existing battery packs needs to be improved.

[0004] In a first aspect, the present invention provides a battery cell structure, comprising:

[0005] The first battery cell includes a first stepped portion and a second stepped portion. A pole post is provided on one side of the first stepped portion in a first direction, and an explosion-proof valve is provided on one side of the second stepped portion in a first direction.

[0006] The second battery cell is arranged in pairs with the first battery cell along the second direction. The second battery cell includes a third step portion and a fourth step portion. The fourth step portion is arranged opposite to the second step portion along the first direction and is adapted to overlap with the second step portion. An explosion-proof valve is provided on the side of the fourth step portion facing the second step portion along the first direction, and an electrode post is provided on the side of the fourth step portion away from the explosion-proof valve along the first direction.

[0007] The battery cell structure provided by this invention features a stepped structure for both the first and second cells, resulting in an octagonal irregular shape. Firstly, this structure offers several advantages: Firstly, it provides a greater number of heat dissipation surfaces, leading to a larger total heat dissipation area when integrated into a battery pack, thus improving the thermal management performance of the battery pack. Secondly, it offers a greater number of selectable bonding surfaces, resulting in a larger bonding area when integrated into the battery pack, which improves bonding strength and enhances the battery pack's modal characteristics. Thirdly, the increased selection of heat dissipation and / or bonding surfaces enhances the adaptability of the battery cells and the integrated battery pack. Fourthly, it allows for the placement of terminals and explosion-proof valves on different surfaces, enabling not only thermal and electrical separation but also providing greater flexibility in the placement of thermal and electrical separation mechanisms.

[0008] In one optional embodiment, the length of the second step portion along the second direction is P1, and P1 satisfies 1 / 5×Q1≤P1≤1 / 3×Q1, where Q1 is the total length of the first cell along the second direction;

[0009] The length of the fourth step along the second direction is P2, which satisfies 1 / 5×Q2≤P2≤1 / 3×Q2, where Q2 is the total length of the second cell along the second direction.

[0010] Beneficial effects: On the one hand, it ensures sufficient overlap length between the second and fourth steps, thereby guaranteeing the overall rigidity of the entire long blade cell structure. On the other hand, it ensures sufficient space for the explosion-proof valve to meet the requirement of setting multiple explosion-proof valves for a single cell, thereby increasing the cell pressure relief speed, realizing the function of rapid venting, and improving the safety performance of the battery pack. Furthermore, it ensures sufficient space for the terminals to ensure sufficient insulation distance between the positive and negative terminals, ensuring the electrical safety of the cell and the battery pack.

[0011] Secondly, the present invention also provides a battery pack, comprising:

[0012] The cell structure described above;

[0013] The first cold plate is disposed between the first battery cell and the second battery cell, and the first cold plate is bonded to the first battery cell and the second battery cell; the first cold plate has an exhaust port that is opposite to the explosion-proof valve, the first cold plate is hollow and forms an exhaust channel and a first cooling flow channel, the exhaust channel is connected to the exhaust port, and the first cooling flow channel is suitable for the flow of cooling medium.

[0014] Beneficial effects: The battery pack provided by this invention features a stepped structure for both the first and second cells. The first cell has an explosion-proof valve on one side of the second stepped portion in a first direction, and the second cell has an explosion-proof valve on the side of the fourth stepped portion facing the second stepped portion in the first direction. An exhaust port opposite to the explosion-proof valve is formed on the first cold plate. By bonding the first cold plate to the first and second cells, and simultaneously allowing the second and fourth stepped portions to overlap, the rigidity of the battery pack is improved. Furthermore, by integrating a short-blade cell into a long-blade cell structure, space along the first direction of the battery pack is saved. This improves the volumetric assembly efficiency of the battery pack. On the other hand, it integrates the explosion-proof valve with the exhaust port and exhaust channel. Furthermore, by setting the terminals of the first cell and the explosion-proof valve at different steps of the first cell, and setting the terminals of the second cell and the explosion-proof valve on both sides of the fourth step in the first direction, thermal and electrical separation is achieved, avoiding the impact of the explosion-proof valve on the terminals under thermal runaway conditions. In addition, the first cooling plate is also provided with a first cooling channel. By bonding the first cooling plate to the first cell and the second cell, the first cell and the second cell are cooled, thereby improving the thermal management performance of the battery pack.

[0015] In one alternative implementation, the first cold plate includes:

[0016] The first plate is disposed between the fourth step and the second step. The first plate is bonded to the fourth step and the second step on both sides in the first direction. The first plate is hollow and forms an exhaust channel and a first cooling channel. An exhaust port is provided on the first plate. The exhaust port and the explosion-proof valve are arranged opposite to each other in the first direction.

[0017] The second plate is set at an angle to the first plate and is located between the second step and the third step. The second plate is bonded to the second step and the third step on both sides in the second direction, respectively. The interior of the second plate is hollow and forms a first cooling channel.

[0018] The third plate is set at an angle to the first plate and is located between the first step and the fourth step. The second side of the third plate is bonded to the first step and the fourth step respectively. The interior of the third plate is hollow and forms a first cooling channel.

[0019] Beneficial effects: This integrates the first and second battery cells into a long-blade battery cell structure, saving space along the first direction of the battery pack and improving the volumetric assembly efficiency of the battery pack. Simultaneously, the first, second, and third plates are all equipped with first cooling channels, enabling the first cold plate to integrate a three-sided cooling structure for the battery cell. Cooling media circulates within the first cooling channels, simultaneously cooling the first and second battery cells. This improves both the volumetric assembly efficiency and the thermal management performance of the battery pack. Furthermore, the first plate is also equipped with exhaust ports and exhaust channels. While the first cold plate is bonded and integrated with the first and second battery cells, the explosion-proof valves of the first and second battery cells are also integrated with the exhaust ports and exhaust channels. When the explosion-proof valves open under thermal runaway conditions, they connect to the exhaust ports and exhaust channels, promptly venting thermal runaway gases into the exhaust channels, thus improving the safety performance of the battery pack.

[0020] In one alternative embodiment, a first cooling channel on the first plate is disposed on at least one side of the exhaust channel along the second direction.

[0021] Beneficial effects: The first cooling channel cools the first and second cells while simultaneously cooling the gas in the exhaust channel, thereby improving the safety performance of the battery pack.

[0022] In one optional embodiment, a thermally conductive structural adhesive layer is provided between the first cold plate and the first and second battery cells. The thermally conductive structural adhesive layer is made of a thermally conductive material and is suitable for bonding the first cold plate to the first and second battery cells.

[0023] Beneficial effects: It can bond the first cold plate to the first and second battery cells through the thermally conductive structural adhesive layer, and integrate the first and second battery cells into a long knife-shaped battery cell structure. This can improve the battery pack volume assembly efficiency while enhancing the modality and / or strength of the entire battery pack. It can also achieve rapid heat conduction between the first cold plate and the first and second battery cells, thereby enhancing the cooling performance of the battery pack.

[0024] In one alternative embodiment, the first cold plate further includes a fourth plate body, which is angled to the third plate body and is adapted to support the first and second battery cells.

[0025] Beneficial effects: This allows the first, second, third, and fourth plates to share the force with the first and second battery cells, which helps to improve the rigidity of the battery pack.

[0026] In one alternative implementation, the battery pack further includes:

[0027] The second cold plate includes a fifth plate body, which is bonded to the side of the first step portion away from the second step portion along the second direction. The fifth plate body is hollow inside and forms a second cooling channel.

[0028] The third cold plate includes a sixth plate body, which is bonded to the side of the third step portion away from the fourth step portion along the second direction. The interior of the sixth plate body is hollow and forms a third cooling channel.

[0029] The first cold plate, the second cold plate, and the third cold plate are integrally bonded and extruded with the first battery cell and the second battery cell.

[0030] Beneficial effects: On the one hand, it can integrate the first and second cells into a long blade cell structure, improving the volumetric assembly efficiency of the battery pack. On the other hand, it can simultaneously cool the first and second cells through the first, second, and third cooling channels, thereby further improving the thermal management performance of the battery pack. Furthermore, the first, second, and third cold plates can share the load as a whole with the first and second cells, eliminating the need for crossbeams and longitudinal beams within the battery pack, thus improving the rigidity and strength of the battery pack and its interior.

[0031] In one alternative embodiment, the second cold plate further includes a seventh plate, which is angled to the fifth plate and is adapted to support the first battery cell together with the fourth plate.

[0032] The third cold plate also includes an eighth plate, which is set at an angle to the sixth plate. The eighth plate is suitable for supporting the second cell together with the fourth plate.

[0033] Beneficial effects: By bonding and extruding the first, second, and third cold plates with the first and second battery cells to form a long blade battery cell structure, and by using the fourth, seventh, and eighth plates to support the battery cell, the rigidity and strength of the battery pack and its internal structure are further improved.

[0034] In one alternative embodiment, a thermally conductive structural adhesive layer is provided between the fifth plate and the first step portion and between the sixth plate and the third step portion. The thermally conductive structural adhesive layer is made of a thermally conductive material and is suitable for bonding the fifth plate to the first step portion and the sixth plate to the third step portion.

[0035] Beneficial effects: On the one hand, it enables the integral bonding and extrusion molding of the first, second, and third cold plates with the first and second battery cells, thereby forming a long-blade battery cell structure and improving the volumetric assembly efficiency of the battery pack. On the other hand, it can enhance the modal and / or strength of the entire battery pack, ensuring the structural stability of the battery pack. Furthermore, it can enable rapid heat conduction between the second cold plate and the first battery cell, as well as between the third cold plate and the second battery cell, thereby further enhancing the cooling performance of the battery pack. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a perspective view of a first battery cell according to an embodiment of the present invention;

[0038] Figure 2 This is a perspective view of a second battery cell according to an embodiment of the present invention;

[0039] Figure 3 This is a three-dimensional assembly diagram of a first battery cell and a second battery cell according to an embodiment of the present invention;

[0040] Figure 4 This is an exploded view of a battery pack according to an embodiment of the present invention;

[0041] Figure 5 This is a perspective view of a battery pack according to an embodiment of the present invention;

[0042] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle;

[0043] Figure 7 for Figure 5 A magnified view of a portion of point B in the middle;

[0044] Figure 8 for Figure 5 A magnified view of a portion of point C in the middle;

[0045] Figure 9 for Figure 6 A magnified view of a portion of point D in the middle;

[0046] Figure 10 This is a perspective view of a first cold plate according to an embodiment of the present invention;

[0047] Figure 11 for Figure 10 A magnified view of a portion of point E in the middle.

[0048] Explanation of reference numerals in the attached figures:

[0049] 11. First battery cell; 111. First step section; 112. Second step section; 12. Second battery cell; 121. Third step section; 122. Fourth step section; 13. Terminal post; 14. Explosion-proof valve;

[0050] 20. First cold plate; 201. Exhaust port; 202. Exhaust channel; 203. First cooling channel; 21. First plate; 22. Second plate; 23. Third plate; 24. Fourth plate;

[0051] 30. Thermally conductive structural adhesive layer;

[0052] 40. Second cold plate; 401. Second cooling channel; 41. Fifth plate; 42. Seventh plate;

[0053] 50. Third cold plate; 501. Third cooling channel; 51. Sixth plate; 52. Eighth plate. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] The battery packs in related technologies mostly use top or bottom venting, which cannot achieve thermal and electrical separation. Furthermore, the volumetric packing efficiency of short-blade batteries is low, and the heat dissipation performance of short-blade batteries is lower than that of prismatic batteries. Therefore, it is necessary to further improve the volumetric packing efficiency and thermal management performance of battery packs.

[0056] The following is combined with Figures 1 to 11 The following describes embodiments of the present invention.

[0057] According to an embodiment of the present invention, in one aspect, a battery cell structure is provided, comprising:

[0058] First cell 11, please refer to Figure 1As shown, the first battery cell 11 has a stepped structure, including a first stepped portion 111 and a second stepped portion 112. A terminal post 13 is provided on one side of the first stepped portion 111 in a first direction, and one or more explosion-proof valves 14 are provided on one side of the second stepped portion 112 in a first direction. When there are multiple explosion-proof valves 14, the battery pressure relief speed can be increased, the function of rapid venting can be realized, and the safety performance of the battery pack can be improved. The terminal post 13 and the explosion-proof valve 14 of the first battery cell 11 are respectively provided on different stepped portions of the first battery cell 11, so as to avoid the impact of the explosion-proof valve 14 on the terminal post 13 when it opens under thermal runaway conditions.

[0059] For the second battery cell 12, please refer to... Figure 3 As shown, the second battery cell 12 and the first battery cell 11 are arranged in pairs along the second direction; please combine them together. Figure 2 As shown, the second battery cell 12 has a stepped structure, including a third stepped portion 121 and a fourth stepped portion 122. The fourth stepped portion 122 is disposed opposite to the second stepped portion 112 along a first direction. The fourth stepped portion 122 is adapted to overlap with the second stepped portion 112, thereby integrating the first battery cell 11 and the second battery cell 12 into a long blade battery cell structure. One or more explosion-proof valves 14 are disposed on the side of the fourth stepped portion 122 facing the second stepped portion 112 along the first direction, and a pole post 13 is disposed on the side of the fourth stepped portion 122 away from the explosion-proof valves 14 along the first direction. The pole post 13 and the explosion-proof valves 14 of the second battery cell 12 are respectively disposed on both sides of the fourth stepped portion 122 in the first direction, avoiding the influence of the explosion-proof valves 14 on the pole post 13 when they open under thermal runaway conditions.

[0060] It should be noted that both the first cell 11 and the second cell 12 can be short blade cells, and the dimensions of the first cell 11 and the second cell 12 along the second direction can be 300mm to 600mm.

[0061] Compared with the rectangular structure of battery cells in related technologies, the battery cell structure provided by this invention has a stepped structure for both the first battery cell 11 and the second battery cell 12, which makes both the first battery cell 11 and the second battery cell 12 form an octagonal irregular shape structure. Firstly, there are more heat dissipation surfaces, resulting in a larger total heat dissipation area when integrated into a battery pack, which is beneficial to improving the thermal management performance of the battery pack. Secondly, there are more selectable bonding surfaces, resulting in a larger bonding area when integrated into a battery pack, which is beneficial to improving bonding strength and enhancing the modality of the battery pack. Thirdly, due to the greater selection of heat dissipation surfaces and / or bonding surfaces, the adaptability of the battery cell and the battery pack integrated with the battery cell is stronger. Fourthly, the terminal post 13 and the explosion-proof valve 14 can be set on different surfaces, which not only achieves thermal and electrical separation, but also provides more options for the setting space of thermal and electrical separation.

[0062] In some embodiments, see Figure 1As shown, the length of the second step portion 112 along the second direction is P1, and P1 satisfies 1 / 5×Q1≤P1≤1 / 3×Q1, where Q1 is the total length of the first cell 11 along the second direction;

[0063] Please see Figure 2 As shown, the length of the fourth step portion 122 along the second direction is P2, which satisfies 1 / 5×Q2≤P2≤1 / 3×Q2, where Q2 is the total length of the second cell 12 along the second direction.

[0064] It should be noted that if the lengths of the second step portion 112 and the fourth step portion 122 along the second direction are too small, it will not only easily lead to a reduction in the overlap length between the second step portion 112 and the fourth step portion 122, resulting in a decrease in the overall rigidity of the entire long knife cell structure, but also easily reduce the installation space of the explosion-proof valve 14, making it impossible to meet the requirement of installing multiple explosion-proof valves in a single cell, thus affecting the venting inside the cell. Therefore, the length P1 of the second step portion 112 along the second direction must satisfy P1≥1 / 5×Q1, and the length P1 of the fourth step portion 122 along the second direction must satisfy P1≥1 / 5×Q1. The length P2 in the direction must satisfy P2≥1 / 5×Q2; since the total length of the short blade cell is fixed, if the lengths of the second step 112 and the fourth step 122 along the second direction are too large, it will easily reduce the setting space of the pole post 13, resulting in a reduction in the insulation distance between the positive and negative pole posts, which will affect the electrical safety of the cell and the battery pack. Therefore, P1 must also satisfy P1≤1 / 3×Q1, and P2 must also satisfy P2≤1 / 3×Q2, where Q1 is the total length of the first cell 11 along the second direction, and Q2 is the total length of the second cell 12 along the second direction.

[0065] The length P1 of the second step portion 112 along the second direction satisfies 1 / 5×Q1≤P1≤1 / 3×Q1, and the length P2 of the fourth step portion 122 along the second direction satisfies 1 / 5×Q2≤P2≤1 / 3×Q2. This ensures sufficient overlap length between the second step portion 112 and the fourth step portion 122, thereby guaranteeing the overall rigidity of the entire long blade cell structure. On the other hand, it ensures sufficient space for the explosion-proof valve 14, meeting the requirement of setting multiple explosion-proof valves for a single cell, thereby increasing the cell's pressure relief speed, realizing the function of rapid venting, and improving the safety performance of the battery pack. Furthermore, it ensures sufficient space for the terminal post 13, guaranteeing sufficient insulation distance between the positive and negative terminals, and ensuring the electrical safety of the cell and the battery pack.

[0066] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising:

[0067] The cell structure described above;

[0068] First cold plate 20, please refer to Figure 4 and Figure 5As shown, the first cold plate 20 is disposed between the first battery cell 11 and the second battery cell 12, and the first cold plate 20 is bonded to the first battery cell 11 and the second battery cell 12; please refer to Figure 10 As shown, the first cold plate 20 has an exhaust port 201 that is opposite to the explosion-proof valve 14. The first cold plate 20 is hollow and forms an exhaust channel 202 and a first cooling channel 203. The exhaust channel 202 is connected to the exhaust port 201. The first cooling channel 203 is independently set with the exhaust channel 202. The first cooling channel 203 is suitable for the flow of cooling medium.

[0069] It should be noted that, please refer to Figure 3 As shown, the first cell 11 is arranged along a third direction to form a first short-blade battery module, and the second cell 12 is arranged along a third direction to form a second short-blade battery module. The first cell 11 and the second cell 12 are arranged in pairs. The first cell 11 is connected to the fourth step 122 of the second cell 12 through the second step 112. Please refer to... Figure 4 and Figure 5 As shown, the short blade battery cell is integrated into a long blade battery cell structure by bonding the first cold plate 20 to the first battery cell 11 and the second battery cell 12.

[0070] To better illustrate and understand, let's take the example of setting a single explosion-proof valve for each battery cell. Please refer to... Figure 1 and Figure 2 As shown, the explosion-proof valve 14 of the first battery cell 11 and the explosion-proof valve 14 of the second battery cell 12 are offset and aligned along the first direction. Please refer to both. Figure 6 , Figure 10 and Figure 11 As shown, two independently arranged exhaust channels 202 are formed on the first cold plate 20. The two exhaust channels 202 are spaced apart along the second direction. One exhaust channel 202 is integrated with the explosion-proof valve 14 of the first battery cell 11 through the exhaust port 201, and the other exhaust channel 202 is integrated with the explosion-proof valve 14 of the second battery cell 12 through the exhaust port 201. This avoids the first battery cell 11 and the second battery cell 12 from affecting each other in the event of thermal runaway, which is beneficial to optimizing the thermal management performance of the battery pack.

[0071] The battery pack provided by this invention features a stepped structure for both the first cell 11 and the second cell 12. The first cell 11 has an explosion-proof valve 14 located on one side of the second stepped portion 112 in a first direction. The second cell 12 has an explosion-proof valve 14 located on one side of the fourth stepped portion 122 in the first direction towards the second stepped portion 112. An exhaust port 201 opposite to the explosion-proof valve 14 is formed on the first cold plate 20. By bonding and integrating the first cold plate 20 with the first cell 11 and the second cell 12, and simultaneously allowing the second stepped portion 112 to overlap with the fourth stepped portion 122, the rigidity of the battery pack is improved. This integrates short-blade cells into a long-blade cell structure, saves space along the first direction of the battery pack, and improves the efficiency of the battery pack. The battery pack improves volumetric efficiency and integrates the explosion-proof valve 14 with the exhaust channel 202 via the exhaust port 201. Furthermore, by placing the terminal 13 of the first cell 11 and the explosion-proof valve 14 on different steps of the first cell 11, and placing the terminal 13 of the second cell 12 and the explosion-proof valve 14 on opposite sides of the fourth step 122 in the first direction, thermal and electrical separation is achieved, preventing the explosion-proof valve 14 from affecting the terminal 13 under thermal runaway conditions. Additionally, a first cooling channel 203 is provided on the first cold plate 20. By bonding the first cold plate 20 to the first cell 11 and the second cell 12, the first cell 11 and the second cell 12 are cooled, improving the thermal management performance of the battery pack.

[0072] In some embodiments, please combine Figure 6 and Figure 10 As shown, the first cold plate 20 includes:

[0073] The first plate 21 is disposed between the fourth step portion 122 and the second step portion 112. The first plate 21 is bonded to the fourth step portion 122 and the second step portion 112 on both sides in the first direction, respectively. The first plate 21 is hollow inside and forms an exhaust channel 202 and a first cooling channel 203. An exhaust port 201 is provided on the first plate 21. The exhaust port 201 and the explosion-proof valve 14 are arranged opposite to each other in the first direction.

[0074] The second plate 22 is set at an angle to the first plate 21. The second plate 22 is disposed between the second step portion 112 and the third step portion 121. The second plate 22 is bonded to the second step portion 112 and the third step portion 121 on both sides in the second direction, respectively. The second plate 22 is hollow inside and forms a first cooling channel 203.

[0075] The third plate 23 is set at an angle to the first plate 21. The third plate 23 is disposed between the first step portion 111 and the fourth step portion 122. The second sides of the third plate 23 are respectively bonded to the first step portion 111 and the fourth step portion 122. The third plate 23 is hollow inside and forms a first cooling channel 203.

[0076] By bonding the first plate 21 to the fourth step portion 122 and the second step portion 112 on both sides in the first direction, bonding the second plate 22 to the second step portion 112 and the third step portion 121 on both sides in the second direction, and bonding the third plate 23 to the first step portion 111 and the fourth step portion 122 on both sides in the second direction, the first cell 11 and the second cell 12 are integrated into a long blade cell structure, saving space in the battery pack along the first direction and improving the volumetric assembly efficiency of the battery pack. Simultaneously, the first plate 21, the second plate 22, and the third plate 23 are all provided with first cooling channels 203, so that the first cold plate 20 is integrated into a three-sided cooling structure for the cell. The first cell 11 and the second cell 12 are cooled simultaneously by a circulating cooling medium within the 03, which improves the volumetric packing efficiency and thermal management performance of the battery pack. Furthermore, the first plate 21 is also provided with an exhaust port 201 and an exhaust channel 202. While the first cold plate 20 is bonded and integrated with the first cell 11 and the second cell 12, the explosion-proof valve 14 of the first cell 11 and the second cell 12 is also integrated with the exhaust port 201 and the exhaust channel 202. After the explosion-proof valve 14 is opened under thermal runaway conditions, it is connected to the exhaust port 201 and the exhaust channel 202, thereby timely venting the thermal runaway gas into the exhaust channel 202 and improving the safety performance of the battery pack.

[0077] Furthermore, the first plate 21, the second plate 22, and the third plate 23 are integrally formed, thereby ensuring the overall structural strength and sealing of the first cold plate 20.

[0078] In some embodiments, please combine Figure 6 and Figure 11 As shown, the first cooling channel 203 on the first plate 21 is disposed on at least one side of the exhaust channel 202 along the second direction, so that the first cell 11 and the second cell 12 are cooled by the first cooling channel 203, and the gas in the exhaust channel 202 is cooled by the first cooling channel 203, thereby improving the safety performance of the battery pack.

[0079] In some embodiments, see Figure 9 As shown, a thermally conductive structural adhesive layer 30 is provided between the first cold plate 20 and the first battery cell 11 and the second battery cell 12. The thermally conductive structural adhesive layer 30 is made of a thermally conductive material. This allows the first cold plate 20 to be bonded to the first battery cell 11 and the second battery cell 12 through the thermally conductive structural adhesive layer 30, integrating the first battery cell 11 and the second battery cell 12 into a long blade battery cell structure. This improves the battery pack's volume assembly efficiency while enhancing the overall mode and / or strength of the battery pack. It also enables rapid heat conduction between the first cold plate 20 and the first battery cell 11 and the second battery cell 12, thereby enhancing the cooling performance of the battery pack.

[0080] In some embodiments, please combine Figure 6 and Figure 10 As shown, the first cold plate 20 also includes a fourth plate 24, which is set at an angle to the third plate 23, forming a "T"-shaped structure. The fourth plate 24 is suitable for supporting the first battery cell 11 and the second battery cell 12.

[0081] By bonding the first plate 21 to the fourth step portion 122 and the second step portion 112 on both sides in the first direction, bonding the second plate 22 to the second step portion 112 and the third step portion 121 on both sides in the second direction, and bonding the third plate 23 to the first step portion 111 and the fourth step portion 122 on both sides in the second direction, and supporting the first cell 11 and the second cell 12 through the fourth plate 24, the first plate 21, the second plate 22, the third plate 23 and the fourth plate 24 share the force with the first cell 11 and the second cell 12, which helps to improve the rigidity of the battery pack.

[0082] Furthermore, the fourth plate 24 is integrally formed with the third plate 23.

[0083] Furthermore, the thickness of the fourth plate 24 can be 1mm to 3mm.

[0084] In some embodiments, please combine Figure 5 , Figure 7 and Figure 8 As shown, the battery pack also includes:

[0085] The second cold plate 40 includes a fifth plate 41, which is bonded to the side of the first step portion 111 away from the second step portion 112 along the second direction. The fifth plate 41 is hollow inside and forms a second cooling channel 401.

[0086] The third cold plate 50 includes a sixth plate body 51, which is bonded to the side of the third step portion 121 away from the fourth step portion 122 in the second direction. The sixth plate body 51 is hollow inside and forms a third cooling channel 501.

[0087] The first cold plate 20, the second cold plate 40, and the third cold plate 50 are integrally bonded and extruded with the first battery cell 11 and the second battery cell 12.

[0088] By integrally bonding and extruding the first cold plate 20, the second cold plate 40, and the third cold plate 50 with the first battery cell 11 and the second battery cell 12, on the one hand, the first battery cell 11 and the second battery cell 12 can be integrated into a long blade battery cell structure, which improves the volume assembly efficiency of the battery pack. On the other hand, the first battery cell 11 and the second battery cell 12 can be cooled simultaneously by the first cooling channel 203, the second cooling channel 401, and the third cooling channel 501, thereby further improving the thermal management performance of the battery pack. Furthermore, the first cold plate 20, the second cold plate 40, and the third cold plate 50 can share the force as a whole with the first battery cell 11 and the second battery cell 12, eliminating the crossbeam and longitudinal beam structure in the battery pack and improving the rigidity and strength of the battery pack and its interior.

[0089] In some embodiments, please combine Figure 7 and Figure 8 As shown, the second cold plate 40 also includes a seventh plate 42, which is set at an angle to the fifth plate 41. The seventh plate 42 is adapted to support the first cell 11 together with the fourth plate 24.

[0090] The third cold plate 50 also includes an eighth plate 52, which is set at an angle to the sixth plate 51. The eighth plate 52 is adapted to support the second cell 12 together with the fourth plate 24.

[0091] By integrally bonding and extruding the first cold plate 20, the second cold plate 40 and the third cold plate 50 with the first battery cell 11 and the second battery cell 12 to form a long knife battery cell structure, and by using the fourth plate 24, the seventh plate 42 and the eighth plate 52 to support the battery cell, the rigidity and strength of the battery pack and its interior are further improved.

[0092] Furthermore, the thickness of the seventh plate 42 and the eighth plate 52 can be 1mm to 3mm.

[0093] Furthermore, the seventh plate 42 and the fifth plate 41 are integrally formed structures, and the eighth plate 52 and the sixth plate 51 are integrally formed structures.

[0094] In some embodiments, a thermally conductive structural adhesive layer 30 is provided between the fifth plate 41 and the first step portion 111 and between the sixth plate 51 and the third step portion 121. The thermally conductive structural adhesive layer 30 is made of a thermally conductive material and is suitable for bonding the fifth plate 41 to the first step portion 111 and the sixth plate 51 to the third step portion 121.

[0095] By setting a thermally conductive adhesive layer 30 to bond the fifth plate 41 to the first step portion 111 and the sixth plate 51 to the third step portion 121, on the one hand, the first cold plate 20, the second cold plate 40 and the third cold plate 50 can be integrally bonded and extruded with the first cell 11 and the second cell 12 to form a long-blade cell structure, thereby improving the volumetric assembly efficiency of the battery pack. On the other hand, it can enhance the modal and / or strength of the entire battery pack, ensuring the structural stability of the battery pack. Furthermore, it can achieve rapid heat conduction between the second cold plate 40 and the first cell 11 and between the third cold plate 50 and the second cell 12, thereby further enhancing the cooling performance of the battery pack.

[0096] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: Cell structure and first cold plate; The battery cell structure includes: a first battery cell, including a first stepped portion and a second stepped portion, wherein a pole post is provided on one side of the first stepped portion in a first direction, and an explosion-proof valve is provided on one side of the second stepped portion in a first direction. The second battery cell is arranged in pairs with the first battery cell along a second direction; the second battery cell includes a third step portion and a fourth step portion, the fourth step portion is arranged opposite to the second step portion along a first direction, and the fourth step portion is adapted to overlap with the second step portion; an explosion-proof valve is provided on the side of the fourth step portion facing the second step portion along the first direction, and an electrode post is provided on the side of the fourth step portion away from the explosion-proof valve along the first direction; The first cold plate is disposed between the first battery cell and the second battery cell, and the first cold plate is bonded to the first battery cell and the second battery cell; the first cold plate has an exhaust port that is disposed opposite to the explosion-proof valve, the first cold plate is hollow and forms an exhaust channel and a first cooling flow channel, the exhaust channel is connected to the exhaust port, and the first cooling flow channel is suitable for the flow of cooling medium.

2. The battery pack according to claim 1, characterized in that, The length of the second step portion along the second direction is P1, and P1 satisfies 1 / 5×Q1≤P1≤1 / 3×Q1, where Q1 is the total length of the first cell along the second direction; The length of the fourth step portion along the second direction is P2, and P2 satisfies 1 / 5×Q2≤P2≤1 / 3×Q2, where Q2 is the total length of the second cell along the second direction.

3. The battery pack according to claim 1, characterized in that, The first cold plate includes: A first plate is disposed between the fourth step and the second step, and the first plate is bonded to the fourth step and the second step on both sides in the first direction, respectively; the first plate is hollow inside and forms the exhaust channel and the first cooling channel, and the first plate is provided with the exhaust port, which is disposed opposite to the explosion-proof valve in the first direction; The second plate is angled to the first plate and is disposed between the second step and the third step. The second plate is bonded to the second step and the third step on both sides in the second direction, respectively. The second plate is hollow inside and forms the first cooling channel. The third plate is set at an angle to the first plate and is disposed between the first step and the fourth step. The second side of the third plate is bonded to the first step and the fourth step, respectively. The interior of the third plate is hollow and forms the first cooling channel.

4. The battery pack according to claim 3, characterized in that, The first cooling channel on the first plate is disposed on at least one side of the exhaust channel along the second direction.

5. The battery pack according to claim 1, characterized in that, A thermally conductive structural adhesive layer is provided between the first cold plate and the first and second battery cells. The thermally conductive structural adhesive layer is made of a thermally conductive material and is suitable for bonding the first cold plate to the first and second battery cells.

6. The battery pack according to claim 3, characterized in that, The first cold plate also includes a fourth plate, which is angled to the third plate and is adapted to support the first battery cell and the second battery cell.

7. The battery pack according to claim 6, characterized in that, The battery pack also includes: The second cold plate includes a fifth plate body, which is bonded to the side of the first stepped portion away from the second stepped portion along the second direction. The fifth plate body is hollow inside and forms a second cooling channel. The third cold plate includes a sixth plate body, which is bonded to the side of the third step portion away from the fourth step portion along the second direction. The sixth plate body is hollow inside and forms a third cooling channel. The first cold plate, the second cold plate, and the third cold plate are integrally bonded and extruded with the first battery cell and the second battery cell.

8. The battery pack according to claim 7, characterized in that, The second cold plate also includes a seventh plate, which is angled to the fifth plate and is adapted to support the first cell together with the fourth plate. The third cold plate also includes an eighth plate, which is angled to the sixth plate and is adapted to support the second cell together with the fourth plate.

9. The battery pack according to claim 7, characterized in that, A thermally conductive structural adhesive layer is provided between the fifth plate and the first step portion and between the sixth plate and the third step portion. The thermally conductive structural adhesive layer is made of a thermally conductive material and is suitable for bonding the fifth plate to the first step portion and the sixth plate to the third step portion.

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