Blade battery cell, blade module, blade battery and electric vehicle

Abstract

The utility model provides a blade battery cell, a blade module, a blade battery and an electric vehicle, the blade battery cell comprises a battery cell body, a first pole and a second pole, and the battery cell body is provided with a first end face and a second end face in the width direction of the battery cell body; the first pole and the second pole are located in the middle of the first end face and arranged in a spaced mode, and the polarity of the first pole and the polarity of the second pole are opposite. According to the scheme provided by the invention, the first pole and the second pole are arranged in the middle of the first end face in the width direction of the blade cell at an interval, so that compared with a blade cell adopting a side-out pole structure in the related technology, the movement distance of electrons in the blade cell is shortened, the physical impedance is further reduced, and the efficiency of the battery is effectively improved; and the fast charging requirement with higher requirements can be further met.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of blade batteries, in particular to a blade battery cell, a blade module, a blade battery and an electric vehicle. BACKGROUND

[0002] The blade battery is a new type of power battery integrated by a plurality of blade-shaped cuboid blade battery cells in series.

[0003] In the related art, the blade battery cell adopts a side-exit pole structure, that is, the left and right side end faces of the blade battery cell are respectively provided with positive and negative poles. For the entire blade battery, the positive and negative poles are located at the left and right ends of the blade battery, resulting in a relatively long distance of electron movement inside the battery and a relatively large physical impedance, so that the blade battery is difficult to further meet the higher requirement of fast charging. UTILITARIAN CONTENT

[0004] The application provides a blade battery cell, a blade module, a blade battery and an electric vehicle, which can solve the problem that the blade battery in the related art is difficult to further meet the higher requirement of fast charging.

[0005] In a first aspect, the application provides a blade battery cell, comprising:

[0006] A cell body, the cell body has a first end face and a second end face in the width direction thereof;

[0007] A first pole and a second pole are located in the middle of the first end face and are spaced apart, and the first pole and the second pole are opposite in polarity.

[0008] The first pole and the second pole are spaced apart in the middle of the first end face in the width direction of the blade battery cell, which shortens the movement distance of electrons inside the blade battery cell, further reduces the physical impedance, effectively improves the efficiency of the battery, and therefore can further meet the higher requirement of fast charging.

[0009] In combination with the first aspect, in some possible implementation manners, the first end face is provided with a groove, and the groove penetrates through the cell body in the thickness direction of the cell body;

[0010] The first pole and the second pole are arranged on the groove bottom wall.

[0011] In combination with the first aspect and the above implementation manner, in some possible implementation manners, the number of the grooves is two and the grooves are spaced apart;

[0012] The first pole and the second pole are arranged in one-to-one correspondence with the two grooves.

[0013] In a second aspect, the application also provides a blade module, comprising:

[0014] a plurality of the blade cells according to any one of the first aspect, the plurality of the blade cells are stacked along the thickness direction of the cell body, and two adjacent blade cells are connected by a busbar.

[0015] In some possible implementation manners, in combination with the second aspect, the busbar is at least partially arranged in the groove.

[0016] In a third aspect, the application also provides a blade battery, comprising:

[0017] the blade module according to any one of the second aspect;

[0018] a fixed frame comprising two side beams arranged in opposite directions, and the blade module is arranged between the two side beams;

[0019] In some possible implementation manners, in combination with the third aspect, the cell body has two opposite side surfaces in the length direction, and the side surfaces are provided with cell explosion-proof valves.

[0020] The side beam near the blade module is provided with a smoke exhaust duct, the smoke exhaust duct is provided with a plurality of smoke exhaust openings, the smoke exhaust openings are arranged near the surface of the cell explosion-proof valve and opposite to the cell explosion-proof valve.

[0021] In some possible implementation manners, in combination with the third aspect and the above implementation manners, a gap is reserved between the side surface and the surface of the adjacent smoke exhaust duct, and the size of the gap is less than or equal to 2 mm.

[0022] In some possible implementation manners, in combination with the third aspect and the above implementation manners, the blade battery further comprises:

[0023] two liquid cooling plates arranged on two sides of the blade module along the width direction, and the two liquid cooling plates are arranged in close contact with the first end surface and the second end surface respectively.

[0024] In a fourth aspect, the application also provides an electric vehicle, comprising:

[0025] the blade battery according to any one of the third aspect.

[0026] Additional aspects and advantages of the application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the implementation. The accompanying drawings are included to provide a description of the implementation and are not intended to limit the scope of the application. Moreover, in the drawings, like reference numerals designate like parts throughout the various figures. In the drawings:

[0028] Figure 1 is a structural schematic diagram of a blade battery provided by an embodiment of the application;

[0029] Figure 2 is Figure 1 an exploded structural schematic diagram of the blade battery;

[0030] Figure 3 is Figure 2 a structural schematic diagram of a fixed frame in the blade battery;

[0031] Figure 4 is Figure 2 a structural schematic diagram of a blade module in the blade battery;

[0032] Figure 5 is Figure 4 a structural schematic diagram of a blade battery cell in the blade module;

[0033] Figure 6 is Figure 4 a structural schematic diagram of another blade battery cell in the blade module;

[0034] Figure 7 is Figure 1 a top view of the blade battery cell installed in the fixed frame in the blade battery;

[0035] Figure 8 is Figure 7 an enlarged structural schematic diagram of a partial I in the fixed frame.

[0036] The following is an explanation of the reference numerals in the drawings:

[0037] 1—blade battery;

[0038] 100—blade module;

[0039] 101—blade battery cell;

[0040] 110—cell body; 111—first end face; 1110—recess; 112—second end face; 113—side face;

[0041] 120—first pole;

[0042] 130—second pole;

[0043] 140—cell explosion-proof valve;

[0044] 102 - busbar;

[0045] 200 - fixed frame;

[0046] 210 - side beam; 211 - smoke exhaust duct; 212 - smoke exhaust port; 213 - gap;

[0047] 300 - liquid cooling plate;

[0048] 400 - upper cover;

[0049] 500 - lower cover;

[0050] X - length direction; Y - thickness direction; Z - width direction. DETAILED DESCRIPTION

[0051] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0053] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix" and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] In the description of the embodiments of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0057] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0058] In the related art, the blade cell adopts a structure of side pole, that is, the left and right side end faces of the blade cell are respectively provided with positive and negative poles. For the entire blade battery, the positive and negative poles are located at the left and right ends of the blade battery, which causes the distance of the electronic movement inside the battery to be relatively long, the physical impedance to be relatively large, and the blade battery to be difficult to further meet the higher requirement of fast charging.

[0059] In order to solve the above technical problems, the present application provides a kind of blade cell, blade module, blade battery and electric vehicle, it can solve the problem that the blade battery in related art is difficult to further meet the higher requirement of fast charging. The blade cell, blade module, blade battery and electric vehicle provided by the embodiments of the present application are described in detail below with reference to the drawings of the specification.

[0060] Please refer to Figure 1 And Figure 2 The present application provides an electric vehicle, which comprises a blade battery 1, the blade battery 1 comprises a blade module 100 and a fixed frame 200, and further comprises an upper cover 400 and a lower cover 500 located on the upper side and the lower side of the blade module 100 and the fixed frame 200 respectively. The upper cover 400, the lower cover 500 and the fixed frame 200 form a containing space for mounting the blade module 100. The number of the blade module 100 is at least one, that is,Figure 2 The two shown could also represent one, three, four, six, etc. See also Figure 3 The fixed frame 200 includes two side beams 210 arranged at relative intervals, and the blade module 100 is fixedly arranged between the two side beams 210.

[0061] See Figure 4 The blade module 100 includes multiple blade cells 101, which are stacked along the thickness direction Y of the cell body 110. The number of blade cells 101 can be flexibly adjusted according to the capacity requirements of the electric vehicle for the blade battery 1. It is understood that the greater the capacity requirement of the blade battery 1, the more blade cells 101 are typically required.

[0062] See Figure 5 and Figure 6 The blade battery cell 101 includes a cell body 110, a first terminal 120, and a second terminal 130. The cell body 110 has a first end face 111 and a second end face 112 in its width direction Z; the first terminal 120 and the second terminal 130 are located in the middle of the first end face 111 and are spaced apart, and the polarities of the first terminal 120 and the second terminal 130 are opposite.

[0063] like Figure 5 and Figure 6 As shown, the first end face 111 and the second end face 112 are two opposite end faces in the vertical direction. The middle part of the first end face 111 refers to the area between its two ends, not its geometric center, relative to its two ends. To ensure the safety of the blade battery cell 101, the distance between the first terminal 120 and the second terminal 130 is kept as short as possible to minimize the distance electrons need to travel and reduce physical impedance. The distance between the first terminal 120 and the second terminal 130 can be determined experimentally, and this application does not impose a specific limitation on it. The polarity of the first terminal 120 and the second terminal 130 can be flexibly set according to requirements; for example, as shown... Figure 5 and Figure 6 As shown, the first terminal 120 can be a positive terminal, the second terminal 130 can be a negative terminal, and vice versa.

[0064] In the solution provided by this application embodiment, the first electrode post 120 and the second electrode post 130 are spaced apart and disposed at the middle of the first end face 111 in the width direction Z of the blade cell 101. Compared with the blade cell 101 with a side-out electrode post structure in the related art, this shortens the movement distance of electrons inside the blade cell 101, further reduces physical impedance, and effectively improves battery efficiency. Therefore, the solution provided by this application embodiment can further meet the higher requirements of fast charging.

[0065] In addition, the blade battery cells 101 in the blade battery 1 are usually arranged transversely. In the blade battery cell 101 with a side terminal structure in the related art, the positive and negative terminals are located at the left and right ends of the blade battery 1, and are prone to be damaged and short-circuited when the side of the electric vehicle is hit, resulting in thermal runaway of the blade battery 1. In the embodiment of the present application, the first terminal 120 and the second terminal 130 of the blade battery cell 101 are arranged at the middle of the first end surface 111 in the width direction Z of the blade battery cell 101, that is, at the upper side of the blade battery cell 101, which can further reduce the probability of damage and short-circuit of the first terminal 120 and the second terminal 130 when the side of the electric vehicle is hit, and effectively improve the safety of the blade battery 1.

[0066] 2See Figure 4 , Figure 5 and Figure 6 In some embodiments, the first end surface 111 of the cell body 110 is provided with a groove 1110, the groove 1110 penetrating through the cell body 110 in the thickness direction Y of the cell body 110; and the first terminal 120 and the second terminal 130 of the cell body 110 are arranged on the groove bottom wall of the groove 1110. Since two adjacent blade battery cells 101 are connected by the bus bar 102, the bus bar 102 can be at least partially arranged in the groove 1110 by arranging the groove 1110, for example, most of the bus bar 102 except the two ends is placed in the groove 1110, which reduces the space occupation of the bus bar 102 in the width direction Z of the blade battery cell 101 and improves the volume utilization rate of the blade battery 1.

[0067] It should be noted that there are various ways to arrange the groove 1110. In one embodiment, considering the convenience of processing the groove 1110, as shown in Figure 5 , the number of grooves 1110 can be only one, and the width of the groove 1110 is greater than the distance between the first terminal 120 and the second terminal 130. In another embodiment, considering the improvement of the energy density of the blade battery 1, as shown in Figure 6 , the number of grooves 1110 is two and is arranged in a spaced manner; the first terminal 120 and the second terminal 130 are arranged one by one corresponding to the two grooves 1110. In this way, the space between the two grooves 1110 can be effectively utilized. The width of each groove 1110 can be 50mm-80mm, and the depth can be 10mm-30mm. It should be noted that for the blade battery cell with only one groove 1110, the two grooves 1110 arranged in the embodiment of the present application can effectively utilize the space between the first terminal 120 and the second terminal 130, and further improve the energy density of the blade battery 1.

[0068] In addition, referring to Figure 5 and Figure 6The liquid injection hole 150 can also be arranged at the first end face 111 adjacent to the first pole column 120 and the second pole column 130, respectively. In this way, the electrolyte can be conveniently injected into the inside of the blade battery cell 101. When the first end face 111 is provided with the groove 1110, the liquid injection hole 150 can also be arranged at the groove bottom wall of the groove 1110.

[0069] Considering that the blade battery generates a large amount of heat during super-fast charging, the accumulated heat causes the temperature of the blade battery 1 to be too high, which further increases the battery impedance of the blade battery 1, as shown in Figure 2 In some embodiments, the blade battery 1 further comprises two liquid cooling plates 300 arranged on both sides of the blade module 100 along the width direction Z, and the two liquid cooling plates 300 are arranged in close contact with the first end face 111 and the second end face 112, respectively. In this way, the heat exchange area of the thermal management of the blade battery 1 can be effectively improved, the heat exchange of the blade battery 1 can be quickly realized, the temperature of the blade battery 1 can be reduced, and the charging rate of the blade battery 1 can be improved, thereby further meeting the higher demand for fast charging.

[0070] As shown in Figures 4 to 6 , the cell body 110 has two opposite side faces 113 in the length direction X, and the side face 113 is provided with a cell explosion-proof valve 140. When the pressure inside the cell body 110 exceeds the safety pressure, the cell explosion-proof valve 140 is opened to release high-temperature gas, thereby reducing the pressure inside the cell body 110 and avoiding explosion of the power battery due to excessive pressure. In some embodiments, as shown in Figure 3 , the edge beam 210 of the fixed frame 200 is provided with a smoke exhaust duct 211 near one side of the blade module 100, and the smoke exhaust duct 211 is provided with a plurality of smoke exhaust openings 212. The smoke exhaust opening 212 is arranged opposite to the surface of the cell explosion-proof valve 140 and opposite to the explosion-proof opening of the explosion-proof valve 140. In this way, when the cell explosion-proof valve 140 is opened and high-temperature gas is released, the high-temperature gas can be guided to the smoke exhaust duct 211 through the smoke exhaust opening 212, thereby quickly exhausting the high-temperature gas generated by thermal runaway and improving the safety of the power battery pack. When the number of blade modules 100 is two, as shown in Figure 2 and Figure 3 , another smoke exhaust duct 211 can also be arranged between the two smoke exhaust ducts 211. In this way, the two blade modules 100 can be arranged between the adjacent two smoke exhaust ducts 211.

[0071] As described above, the first pole column 120 and the second pole column 130 are arranged in the middle of the first end face 111 of the cell body 110 in the width direction Z, as shown in Figure 5 and Figure 6The upper side of the middle battery cell body 110, therefore, the two side surfaces 113 of the battery cell body 110 in the length direction X no longer have a convex structure. In order to further improve the integration and volume utilization of the blade battery 1, see Figure 7 and Figure 8 In some embodiments, a gap d is reserved between the side surface 113 of the battery cell body 110 and the surface of the adjacent smoke exhaust duct 211, and the size of the gap d is less than or equal to 2 mm. Compared with the larger gap (e.g., 30 mm) between the two sides of the blade battery cell 101 with a side pole structure and the smoke exhaust duct 211 in the related art, the scheme provided in the embodiments of the present application can significantly reduce the gap d between the side surface 113 of the battery cell body 110 and the surface of the adjacent smoke exhaust duct 211, effectively improving the integration and volume utilization of the blade battery 1.

[0072] In addition, in order to increase the structural strength of the blade battery 1, the gap d between the side surface 113 of the battery cell body 110 and the surface of the adjacent smoke exhaust duct 211 can also be filled with insulating and heat-insulating materials. In this way, the blade battery cell 202 and the fixed frame 200 can form an integral whole, greatly improving the structural strength of the blade battery 1. The insulating and heat-insulating materials can be insulating structural glue, etc.

[0073] The above embodiments are only used to illustrate the technical solutions of the present application, but 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 they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements 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, and they should all be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A blade battery cell (101), characterized in that, include: The battery cell body (110) has a first end face (111) and a second end face (112) in its width direction (Z); The first pole (120) and the second pole (130) are located in the middle of the first end face (111) and are spaced apart. The first pole (120) and the second pole (130) have opposite polarities.

2. The blade battery cell (101) according to claim 1, characterized in that, The first end face (111) is provided with a groove (1110), and the groove (1110) penetrates the cell body (110) along the thickness direction (Y) of the cell body (110); The first pole post (120) and the second pole post (130) are disposed on the bottom wall of the groove (1110).

3. The blade battery cell (101) according to claim 2, characterized in that, The number of grooves (1110) is two and they are spaced apart; The first pole post (120) and the second pole post (130) are respectively provided in one-to-one correspondence with the two grooves (1110).

4. A blade module (100), characterized in that, include: Multiple blade cells (101) as described in claim 2 or 3 are stacked along the thickness direction (Y) of the cell body (110), and adjacent blade cells (101) are connected by a busbar (102).

5. The blade module (100) according to claim 4, characterized in that, The busbar (102) is at least partially disposed within the groove (1110).

6. A blade battery (1), characterized in that, include: The blade module (100) as described in claim 4 or 5; and The fixed frame (200) includes two side beams (210) arranged at relative intervals, and the blade module (100) is fixedly arranged between the two side beams (210).

7. The blade battery (1) according to claim 6, characterized in that, The battery cell body (110) has two opposing sides (113) in its length direction (X), and the sides (113) are provided with battery cell explosion-proof valves (140); The side beam (210) is provided with a smoke exhaust pipe (211) on the side near the blade module (100). The smoke exhaust pipe (211) has multiple smoke exhaust ports (212). The smoke exhaust ports (212) are close to the surface of the cell explosion-proof valve (140) and are arranged opposite to the cell explosion-proof valve (140).

8. The blade battery (1) according to claim 7, characterized in that, A gap is reserved between the side surface (113) and the surface of the adjacent exhaust pipe (211), the size of which is less than or equal to 2 mm.

9. The blade battery (1) according to claim 6, characterized in that, The blade battery (1) also includes: Two liquid cooling plates (300) are respectively disposed on both sides of the blade module (100) along the width direction (Z), and the two liquid cooling plates (300) are respectively attached to the first end face (111) and the second end face (112).

10. An electric vehicle, characterized in that, include: The blade battery (1) as described in any one of claims 6 to 9.

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