Power battery and design method thereof

Abstract

The invention provides a power battery and a design method of the power battery, and relates to the technical field of batteries. The power battery comprises a box body, a plurality of plug connectors and a plurality of battery modules, wherein the plurality of battery modules are stacked in the box body along a first direction; the box body is provided with a plurality of slots, the plurality of slots are in one-to-one correspondence with the plurality of plug connectors, the plug connectors are plugged in the corresponding slots, so that the plug connectors protrude relative to the inner wall of the box body, and each battery module is in contact with the plug connectors. Thus, the plug connector protruding relative to the inner wall of the box body is in contact with the battery module, displacement of the battery cells in the battery module can be limited, the risk of deviation of the battery cells can be reduced, the risk of breakage or separation of the electric connection part and the battery cells is reduced, and then the risk of short-circuit fire between the battery cells is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a power battery and a design method of the power battery. BACKGROUND

[0002] With the vigorous development of the new energy vehicle market, the power battery of the new energy vehicle also attracts much attention. As the core electric energy source of the new energy vehicle, the performance of the power battery seriously affects the endurance of the new energy vehicle. The power battery includes a battery module and a box body. The battery module is placed in the box body. The battery module includes a plurality of battery cells. The plurality of battery cells are stacked along a thickness direction. The height of the existing battery cell is generally within 145 mm. In some new energy vehicles, a larger installation space in the height direction can be provided for the power battery. The utilization rate of the space is low when the above-mentioned power battery pack is used. Therefore, a power battery in which two battery modules are stacked in the height direction in the box body begins to appear.

[0003] However, the structural stability of the power battery with two battery modules is poor. The risk of breakage or separation of the electrical connection components at the top of the battery cells from the battery cells is large due to the position deviation of the battery cells caused by vibration or collision during the use of the power battery. In severe cases, short circuit and fire occur between the battery cells. SUMMARY

[0004] Therefore, the present application provides a power battery to solve the problem of poor structural stability of the power battery to a certain extent.

[0005] According to an aspect of the present application, a power battery is provided. The power battery includes a box body, a plurality of plug-in parts and a plurality of battery modules. The plurality of battery modules are stacked in the box body along a first direction. The box body is provided with a plurality of insertion slots. The plurality of insertion slots correspond to the plurality of plug-in parts one by one. The plug-in parts are inserted into the corresponding insertion slots so that the plug-in parts protrude relative to the inner wall of the box body. Each battery module is in contact with the plug-in part.

[0006] Preferably, the box body includes a mounting body, a bearing part and a cover plate. The mounting body has two openings opposite in the first direction. The bearing part and the cover plate are respectively provided on the two openings. The power battery further includes a partition. The partition is connected to the inner side wall of the mounting body. The partition is arranged between adjacent two battery modules.

[0007] Preferably, the battery module includes a plurality of blade battery cells. The plurality of blade battery cells are stacked along a second direction. The blade battery cell includes two pole columns. The two pole columns are respectively located on different sides of the blade battery cell in a third direction. The bearing member and the cover plate are both provided with the insertion slot, the second direction is perpendicular to the first direction, and the third direction is perpendicular to the plane determined by the first direction and the second direction.

[0008] Preferably, the battery module comprises a plurality of square cells, the plurality of square cells are arranged in a stacking manner along a second direction, the square cells comprise a pole, the pole faces the cover plate, the mounting body is provided with the insertion slot on both sides thereof opposite to each other in the second direction and / or both sides thereof opposite to each other in a third direction, the second direction is perpendicular to the first direction, and the third direction is perpendicular to the plane determined by the first direction and the second direction.

[0009] Preferably, the partition member surrounds a heat exchange cavity, the partition member is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are both in communication with the heat exchange cavity.

[0010] Preferably, the partition member comprises a first plate, a second plate and a partition plate, the partition plate is connected with the first plate and the second plate respectively, the partition plate divides the space between the first plate and the second plate into a first cavity and a second cavity, the first cavity and the second cavity are located on both sides of the partition plate in the first direction respectively, the first plate is provided with a first liquid inlet and a first liquid outlet, the first liquid inlet and the first liquid outlet are both in communication with the first cavity, and the second plate is provided with a second liquid inlet and a second liquid outlet, the second liquid inlet and the second liquid outlet are both in communication with the second cavity.

[0011] Preferably, the power battery further comprises a support plate, the number of the battery modules is two, the support plate is fixed to the inner wall of the box body, and both ends of the support plate in the first direction are connected with the bearing member and the partition member respectively. According to another aspect of the present application, a design method of a power battery is provided, the design method of the power battery is used for designing a power battery, the power battery comprises a box body, a partition member, an insertion member and two battery modules, the two battery modules are stacked in the box body along a first direction, the partition member is located between the two battery modules, each battery module comprises a plurality of cells, the box body is provided with a plurality of insertion slots, and each insertion slot is correspondingly provided with the insertion member, the design method of the power battery comprises the following steps: selecting the type of the cell, and determining the positions of the insertion slot and the partition member based on the cell; obtaining the pressure of the partition member, and comparing the pressure with the strength of the partition member; when the pressure is greater than the strength, a support plate is arranged at the bottom of the partition member; When the pressure is less than or equal to the strength, the support plate is not arranged at the bottom of the partition.

[0012] Preferably, when the battery cell is a square battery cell, the distance between the partition and the square battery cell in the battery module below the partition is 10mm-15mm, the plurality of battery cells are arranged in a stack along a second direction, the box is provided with the insertion slot on two sides opposite to each other in the second direction and / or on two sides opposite to each other in a third direction, the second direction intersects the first direction, and the third direction intersects the plane determined by the first direction and the second direction.

[0013] Preferably, when the battery cell is a square battery cell, the distance between the partition and the square battery cell in the battery module below the partition is 10mm-15mm, the plurality of battery cells are arranged in a stack along a second direction, the box is provided with the insertion slot on two sides opposite to each other in the second direction and / or on two sides opposite to each other in a third direction, the second direction intersects the first direction, and the third direction intersects the plane determined by the first direction and the second direction.

[0014] The power battery of the present application comprises a box, a plurality of insertion pieces and a plurality of battery modules, the plurality of battery modules are arranged in a stack along a first direction in the box; the box is provided with a plurality of insertion slots, the plurality of insertion slots correspond to the plurality of insertion pieces one by one, the insertion pieces are inserted into the corresponding insertion slots so that the insertion pieces protrude relative to the inner wall of the box, and each battery module is in contact with the insertion piece. In this way, the insertion pieces protruding relative to the inner wall of the box are in contact with the battery modules, which can limit the displacement of the battery cells in the battery modules, thereby reducing the risk of displacement of the battery cells, and thus reducing the risk of fracture or separation of the electrical connection components and the battery cells, and further reducing the risk of short circuit and fire between the battery cells. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0016] Figure 1 The relative position diagram of the bearing piece, the cover plate and the battery module when the battery cell is a blade battery cell is shown. Figure 2 The perspective view of the box is shown. Figure 3 The relative position diagram of the first beam and the insertion piece is shown. Figure 4 The local enlarged view of the position of the insertion piece is shown. Figure 5 The explosion view of the partial structure of the box is shown. Figure 6A flowchart illustrating the design method of a power battery is shown.

[0017] Icons: 1-Box body; 11-Mounting main body; 111-First beam; 112-Second beam; 12-Bearing component; 13-Cover plate; 14-Welding block; 15-Explosion-proof valve mounting block; 16-Water inlet mounting block; 17-Power switch mounting block; 18-Crossbeam; 19-Air passage partition beam; 2-Battery module; 3-Separator; 4-Plug-in component; 41-Plug-in main body; 42-Abutting part; 5-Electrical connector; 6-Slot; 7-Support plate; L1-First direction; L2-Second direction; L3-Third direction. Detailed Implementation

[0018] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0019] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0020] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0021] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0022] Although terms such as "first" and "second" and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, terms of a first element, component, region, layer or section described herein could also be termed a second element, component, region, layer or section without departing from the teachings of the examples.

[0023] Spatially relative terms, such as "on", "upper", "lower", "above", "below", "top", "bottom", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Such spatially relative terms can be intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as being "on" or "above" other elements or features would then be oriented "below" other elements or features. Thus, the term "on" can encompass both an "on" and "under" orientation in

[0024] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" and the like are inclusive and open-ended and specify the presence of stated features, integers, operations, components, elements, and / or groups but do not preclude the presence or addition of one or more other features, integers, operations, components, elements, and / or groups thereof.

[0025] Variations in shapes depicted in the drawings can occur as a consequence of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the precise shapes shown in the drawings but include variations in shapes that would result from the manufacturing process used.

[0026] Features of the examples described herein can be combined with one another as would be apparent to one of ordinary skill in the art having the benefit of the present disclosure. Furthermore, although examples are described as having various configurations, other configurations can also be utilized as would be apparent to one of ordinary skill in the art having the benefit of the present disclosure.

[0027] The following detailed description will discuss Figures 1 to 5 A power battery is described, in which Figures 1 to 5In the specific embodiment, the first direction L1 intersects the third direction L3, and the second direction L2 intersects the plane determined by the first direction L1 and the third direction L3, and the intersection is preferably perpendicular. The power battery will be described below in the case that the first direction L1, the third direction L3 and the second direction L2 are perpendicular to each other.

[0028] According to an aspect of the present application, a power battery is provided, such as Figures 1 to 5 As shown in the figure, the power battery comprises a box body 1, a plurality of plug-in parts 4 and a plurality of battery modules 2, the plurality of battery modules 2 are stacked in the box body 1 along the first direction L1; the box body 1 is provided with a plurality of plug-in slots 6, the plurality of plug-in slots 6 correspond to the plurality of plug-in parts 4 one by one, the plug-in parts 4 are plugged into the corresponding plug-in slots 6, so that the plug-in parts 4 protrude relative to the inner wall of the box body 1, and each battery module 2 is in contact with the plug-in part 4. In this way, the plug-in parts 4 protruding relative to the inner wall of the box body 1 are in contact with the battery modules 2, which can limit the displacement of the battery cells in the battery modules 2, which can reduce the risk of displacement of the battery cells, thereby reducing the risk of fracture or separation of the electrical connection components and the battery cells, and further reducing the risk of short circuit and fire between the battery cells.

[0029] Optionally, the number of battery modules 2 can be two, three or more, and preferably the number of battery modules 2 is two.

[0030] As shown in the figure, Figure 1 , Figure 2 and Figure 5 As shown in the figure, the box body 1 comprises a mounting body 11, a bearing part 12 and a cover plate 13, the mounting body 11 comprises two first beams 111 and two second beams 112, the two first beams 111 are arranged at intervals along the third direction L3, the two second beams 112 are arranged at intervals along the second direction L2, the two ends of the first beam 111 in the second direction L2 are connected with the two second beams 112 respectively, the box body 1 has two openings opposite to each other in the first direction L1, the bearing part 12 and the cover plate 13 are respectively covered on the two openings, and the whole box body 1 is in the shape of a cuboid.

[0031] Further, the mounting body 11 further comprises a welding block 14, which can be welded with the adjacent first beam 111 and second beam 112 respectively, and the box body 1 further comprises an explosion-proof valve mounting block 15, a water inlet head mounting block 16 and a battery replacement connector mounting block 17, which are respectively used for mounting the explosion-proof valve, the water inlet head and the battery replacement connector, and the inside of the mounting body 11 is further provided with a cross beam 18 and an air duct partition beam 19.

[0032] As shown in the figure, Figure 2As shown, the power battery further comprises a partition 3 connected with the inner side wall of the mounting body 11, and the partition 3 is arranged between two adjacent battery modules 2, and can support the battery module 2 above the partition 3.

[0033] Optionally, the partition 3 can be provided with a avoiding slot at the position corresponding to the plug-in part 4, so as to ensure that the plug-in part 4 can contact the battery cell.

[0034] When the number of the battery modules 2 is two, only one partition 3 is arranged in the battery module 2, and when the strength of the partition 3 is sufficient to support the battery module 2 above, the lower side of the partition 3 can be not provided with the support plate 7. When the strength of the partition 3 is insufficient to support the battery module 2 above, the lower side of the partition 3 can be provided with the support plate 7, and the two ends of the support plate 7 in the first direction L1 are connected with the bearing 12 and the partition 3 respectively, and the two ends of the support plate 7 in the third direction L3 are connected with the mounting body 11 respectively. In this way, the support plate can support the partition 3, so as to avoid the battery cell in the middle of the battery module 2 above from falling down when vibration occurs. Optionally, the support plate 7 can be a special engineering plastic plate.

[0035] Optionally, in an embodiment of the partition 3, the partition 3 can comprise a first plate and a second plate, the edge of the first plate is connected with the edge of the second plate, and the first plate and the second plate enclose a heat exchange cavity, and the first plate or the second plate is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are communicated with the heat exchange cavity. In this way, the partition 3 can also be used as a water cooling plate to cool the two battery modules 2, so as to improve the space utilization of the power battery.

[0036] In addition, in another embodiment of the partition 3, the partition 3 comprises a first plate, a second plate and a partition plate, the two sides of the partition plate in the first direction L1 are connected with the first plate and the second plate respectively, the partition plate divides the space between the first plate and the second plate into a first cavity and a second cavity, the first cavity and the second cavity are located on the two sides of the partition plate in the first direction L1 respectively, the first plate is provided with a first liquid inlet and a first liquid outlet, the first liquid inlet and the first liquid outlet are communicated with the first cavity, the second plate is provided with a second liquid inlet and a second liquid outlet, and the second liquid inlet and the second liquid outlet are communicated with the second cavity. At this time, the first cavity and the second cavity can cool the two battery modules 2 respectively to meet the cooling demand of the two battery modules 2. Optionally, the first plate and the second plate can be flow channel plates, and the partition plate is a special engineering plastic plate, which has the advantages of light weight, corrosion resistance, high strength and aging resistance.

[0037] Optionally, the battery cell in the battery module 2 can be a blade battery cell or a square battery cell.

[0038] When the battery cell is a blade battery cell, as shown in FIG. 6, the plug-in part 4 can be arranged on the side of the battery cell, and the plug-in part 4 can be arranged on the side of the battery cell. Figure 1As shown, the plurality of blade cells are arranged in a stacked manner along the second direction L2, two polar posts in the blade cells are located on different sides in the third direction L3, and the polar posts of the blade cells can be connected with the electrical connectors 5. At this time, the bearing member 12 and the cover plate 13 are provided with the insertion slots 6, the number of the insertion slots 6 is the same as that of the blade cells in the battery module 2, each insertion slot 6 is inserted with the insertion piece 4, and the insertion piece 4 installed on the bearing member 12 corresponds to the blade cell in the battery module 2 below in a one-to-one manner. The insertion piece 4 is in contact with the corresponding blade cell; the insertion piece 4 installed on the cover plate 13 corresponds to the blade cell in the battery module 2 above in a one-to-one manner, and the insertion piece 4 is in contact with the corresponding blade cell. In this way, the positions of the blade cells in the two battery modules 2 are limited. Alternatively, the insertion slots 6 on the bearing member 12 penetrate the bearing plate, the insertion slots 6 on the cover plate 13 penetrate the cover plate 13, and the insertion piece 4 can be inserted from the outside, and the bearing member 12 is in interference fit with the insertion slot 6 to ensure the stability of the installation of the bearing member 12.

[0039] In addition, when the cells are blade cells, the insertion slots 6 can also be provided on the two first beams 111, and the insertion pieces 4 installed in the insertion slots 6 on the two first beams 111 abut against the two sides of the battery module 2 in the second direction L2, so as to limit the battery module 2 in the second direction L2.

[0040] Alternatively, the electrical connector 5 can be a FPC (Flexible Printed Circuit) or a FFC (Flexible Flat Cable).

[0041] It should be noted that, in order to clearly show the positions of the insertion slots on the bearing member 12, Figure 1 Part of the battery modules 2 are hidden, and only one battery module 2 is shown. In the entity of the power battery, the power battery includes two or more battery modules 2.

[0042] When the cells are square cells, the plurality of square cells are arranged in a stacked manner along the second direction L2, and the polar posts of the square cells all face the cover plate 13. At this time, the insertion slots 6 can be provided on the two second beams 112, and the same insertion slot 6 can be in contact with the two battery modules 2; or two groups of insertion slots 6 can be provided on each second beam 112, the positions of the two groups of insertion slots 6 correspond to the positions of the square cells in the two battery modules 2 respectively, and the plurality of insertion slots 6 in each group correspond to the square cells in the battery module 2 in a one-to-one manner. The insertion piece 4 installed in the insertion slot 6 can be in contact with the corresponding square cell.

[0043] In addition, when the battery cell is a square battery cell, the slot 6 can also be arranged on the two first beams 111, and the plug-in piece 4 arranged in the slot 6 on the two first beams 111 respectively abuts against two sides of the battery module 2 in the second direction L2 to limit the battery module 2 in the second direction L2. Alternatively, the slot 6 is arranged on both the two first beams 111 and the two second beams 112.

[0044] In addition, the plug-in piece 4 arranged in the slot 6 on the second beam 112 can be provided with a avoiding slot at a position corresponding to the position of the partition piece 3 to ensure that the plug-in piece 4 can contact the battery cell.

[0045] It should be noted that, Figure 2 Only to show the relative position of the cover plate 13, the bearing piece 12, the first beam 111 and the second beam 112 and the plug-in piece 4, in the entity of the power battery, the plug-in piece 4 will not be arranged on the cover plate 13, the bearing piece 12, the first beam 111 and the second beam 112 at the same time, but the mounting position of the plug-in piece 4 arranged on the box 1 is selected based on the type of the battery cell in the battery module 2.

[0046] Optionally, the plug-in piece 4 can be made of special engineering plastics.

[0047] In addition, as Figure 4 shown, the plug-in piece 4 includes a plug-in body 41 and an abutting portion 42, the plug-in body 41 is located in the slot 6, and the abutting portion 42 protrudes relative to the inner wall of the box 1, and the cross-sectional area of the abutting portion 42 is smaller than that of the plug-in body 41.

[0048] According to another aspect of the present application, a design method of a power battery is provided, as Figure 6 shown, the power battery includes two battery modules, and the design method of the power battery includes: selecting the type of the battery cell, and determining the position of the slot 6 and the partition piece 3 based on the battery cell; obtaining the pressure of the partition piece 3, and comparing the pressure with the strength of the partition piece 3, when the pressure is greater than the strength, arranging the support plate 7 at the bottom of the partition piece 3, and when the pressure is less than or equal to the strength, arranging the support plate 7 at the bottom of the partition piece 3.

[0049] Optionally, the pressure is equal to the ratio of the weight of the battery module 2 above the partition piece 3 to the area of the surface of the partition piece 3 facing the battery module 2.

[0050] Specifically, when the battery cell is a blade battery cell, the distance between the partition piece 3 and the blade battery cell in the battery module 2 below the partition piece 3 is 1mm-2mm, and at this time, the slot 6 is arranged on the bearing piece 12 and the cover plate 13.

[0051] It should be noted that the distance between the separator 3 and the prismatic battery cell in the battery module 2 located below the separator 3 refers to the distance between the shell of the prismatic battery cell and the lower surface of the separator 3.

[0052] When the battery cell is a prismatic battery cell, the distance between the separator 3 and the prismatic battery cell in the battery module 2 located below the separator 3 is 10-15 mm, and the plurality of battery cells are stacked along the second direction L2, and the two first beams 111 and / or the two second beams 112 are provided with the slot 6.

[0053] It should be noted that the distance between the separator 3 and the prismatic battery cell in the battery module 2 located below the separator 3 refers to the distance between the shell of the prismatic battery cell and the lower surface of the separator 3.

[0054] In this way, by the design method of the power battery of the present application, the separator 3 can have sufficient strength to support the battery module 2 located above.

[0055] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power battery, characterized in that, The power battery includes a housing, multiple connectors, and multiple battery modules, with the multiple battery modules stacked in the housing along a first direction. The housing has multiple slots, each corresponding to a connector. The connector is inserted into the corresponding slot so that it protrudes relative to the inner wall of the housing, and each battery module is in contact with the connector.

2. The power battery according to claim 1, characterized in that, The housing includes a mounting body, a support member, and a cover plate. The mounting body has two openings opposite each other in the first direction, and the support member and the cover plate respectively cover the two openings. The power battery also includes a separator, which is connected to the inner sidewall of the mounting body, and the separator is provided between two adjacent battery modules.

3. The power battery according to claim 2, characterized in that, The battery module includes multiple blade cells, which are stacked along a second direction. Each blade cell includes two terminals, which are located on different sides of the blade cell in the third direction. The slots are provided on both the carrier and the cover plate. The second direction intersects the first direction, and the third direction intersects the plane determined by the first direction and the second direction.

4. The power battery according to claim 2, characterized in that, The battery module includes multiple square cells stacked along a second direction. Each square cell includes a terminal post facing the cover plate. The mounting body has slots on opposite sides in the second direction and / or on opposite sides in a third direction. The second direction intersects the first direction, and the third direction intersects a plane defined by the first and second directions.

5. The power battery according to claim 2, characterized in that, The partition surrounds the heat exchange cavity, and the partition has a liquid inlet and a liquid outlet, both of which are connected to the heat exchange cavity.

6. The power battery according to claim 2, characterized in that, The partition includes a first plate, a second plate, and a partition plate. The partition plate is connected to the first plate and the second plate respectively. The partition plate divides the space between the first plate and the second plate into a first cavity and a second cavity. The first cavity and the second cavity are located on both sides of the partition plate in the first direction. The first plate has a first liquid inlet and a first liquid outlet, both of which are connected to the first cavity. The second plate has a second liquid inlet and a second liquid outlet, both of which are connected to the second cavity.

7. The power battery according to claim 2, characterized in that, The power battery also includes a support plate. There are two battery modules. The support plate is fixed to the inner wall of the housing, and the two ends of the support plate in the first direction are respectively connected to the carrier and the separator.

8. A design method for a power battery, characterized in that, The power battery design method is used to design a power battery, which includes a housing, a separator, a connector, and two battery modules. The two battery modules are stacked in the housing along a first direction. The separator is located between the two battery modules. Each battery module includes multiple cells. The housing has multiple slots, and each slot is correspondingly provided with the connector. The power battery design method includes: Select the type of battery cell, and determine the position of the slot and the separator based on the battery cell; The pressure of the separator is obtained, and the pressure is compared with the strength of the separator; When the pressure is greater than the strength, a support plate is provided at the bottom of the separator. When the pressure is less than or equal to the strength, the support plate is not provided at the bottom of the separator.

9. The design method for a power battery according to claim 8, characterized in that, When the battery cell is a blade battery cell, the distance between the separator and the blade battery cell in the battery module located below the separator is 1mm-2mm, and the housing has slots on both sides opposite to each other in the first direction.

10. The design method for a power battery according to claim 8, characterized in that, When the battery cell is a square battery cell, the distance between the separator and the square battery cell in the battery module located below the separator is 10mm-15mm. Multiple battery cells are stacked along the second direction. The housing has slots on the two sides opposite to each other in the second direction and / or on the two sides opposite to each other in the third direction. The second direction intersects the first direction, and the third direction intersects the plane determined by the first direction and the second direction.

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