CN218975696U - Battery pack and vehicle - Google Patents

Abstract

The utility model discloses a battery pack and a vehicle, wherein the battery pack is provided with at least two partition boards, each partition board comprises a plurality of sub-boards, a containing cavity is defined between the two opposite sub-boards, and an included angle is formed between every two adjacent sub-boards in each partition board, so that the limit of a single battery between the two partition boards is realized in a first direction and a second direction, the connection reliability between the single battery and the partition boards is improved, the partition boards can also serve as inner beams, the space utilization rate of the battery pack is improved, and in addition, the partition boards are provided with inner flow channels, so that the partition boards have the effects of liquid cooling boards and the dimension T of the flow channels ₂ Thickness T of the daughter board ₁ The ratio of the two is limited, so that the flow of the heat conduction fluid in the flow channel is ensured, the temperature of the single battery is effectively regulated, the rigidity of the partition plate is ensured, and the structural strength of the battery pack is ensured.

Description

Battery pack and vehicle

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery pack and a vehicle.

Background

In the existing battery pack, the single battery is clamped between two parallel flat liquid cooling plates, so that the fixing effect is ensured, the single battery and the liquid cooling plates are often required to be fixed by using colloid, but the fixing effect between the single battery and the liquid cooling plates is limited by the quality of the colloid only through colloid connection, and the colloid has a larger failure risk along with the increase of the service time of the battery pack or the stronger impact of the battery pack; in addition, in the traditional battery pack, in order to increase the fixing effect on the single battery and the structural stability of the battery pack, structures such as an inner beam and the like can be additionally arranged, so that the space utilization rate in the box body of the battery pack and the weight energy density of the battery pack can be reduced.

Disclosure of Invention

The utility model aims to provide a battery pack and a vehicle, which are used for solving the problems that the reliability of a mode of fixing a battery monomer by a colloid and an inner beam combination in the conventional battery pack is low and the energy density of the battery pack is affected.

An embodiment of the present application provides a battery pack, including: the battery pack comprises a plurality of single batteries, a plurality of storage batteries and a plurality of storage batteries, wherein the single batteries comprise a first side wall and a second side wall which are oppositely arranged; the plurality of partition boards are arranged at intervals along a first direction, each partition board comprises a plurality of connected sub-boards, the plurality of sub-boards are arranged along a second direction, an included angle is formed between two adjacent sub-boards, the radian of the included angle is alpha rad, pi/2 < alpha < pi is met, and the first direction is intersected with the second direction; in two adjacent clapboards, the sub-board of one clapboards is connected with the other clapboardsThe daughter boards are oppositely arranged and define a containing cavity, and at least one single battery is arranged in the containing cavity; wherein, a flow passage is arranged in the partition board, the flow passage penetrates through at least part of the sub-boards along the extending direction of the partition board, and the dimension of the sub-boards in the fourth direction is T ₁ The size of the flow channel in the fourth direction is T ₂ The method comprises the following steps: t is more than or equal to 0.4 ₂ /T ₁ And < 0.96, said fourth direction intersecting a plane in which said first sidewall lies.

Optionally, T is less than or equal to 0.3mm ₁ 15mm or less, and/or T or less of 0.1mm or less ₂ ≤7mm。

Optionally, the interval between the first side wall and the second side wall of the single battery is T ₃ The method comprises the following steps: t is more than or equal to 0.02 ₁ /T ₃ ≤3。

Optionally, the battery cell further includes a third side wall and a fourth side wall which are oppositely arranged, and a bottom wall and a top wall which are oppositely arranged, wherein the first side wall, the third side wall, the second side wall and the fourth side wall are sequentially connected end to form a hollow cube structure with two open ends, the bottom wall and the top wall are respectively covered with the two open ends, and the first side wall and the second side wall are surfaces with the largest surface areas.

Optionally, the flow channel has a wall thickness T in a third direction ₅ The method comprises the following steps: t is more than or equal to 0.04 ₅ /T ₁ And the third direction is less than or equal to 18.2, and the first direction and the second direction are intersected.

Optionally, the tensile strength of the separator is P, and the weight of the single battery is M, so that the following conditions are satisfied: P/M is less than or equal to 10MPa/Kg and less than or equal to 6000MPa/Kg.

Optionally, the battery pack satisfies: P/M is less than or equal to 30MPa/Kg and less than or equal to 840MPa/Kg.

Optionally, the separator further includes a reinforcing rib, the reinforcing rib is disposed in the flow channel, the flow channel has two inner side walls disposed opposite to each other along the fourth direction, one end of the reinforcing rib is connected to one of the inner side walls, and the other end is connected to the other inner side wall.

Optionally, the reinforcing rib has a shape in a third directionThickness T ₄ The method comprises the following steps: t is more than or equal to 0.03 ₄ /T ₁ Less than or equal to 16.7, and/or meets the following conditions: t is more than or equal to 0.5mm ₄ And the thickness is less than or equal to 5mm, wherein the third direction is intersected with the first direction and the second direction.

Optionally, the partition plate further comprises a connecting part, two adjacent daughter boards are connected through the connecting part, and the flow channel penetrates through the connecting part; the inner wall surface of the flow channel penetrated in the connecting part is an arc surface.

Optionally, an adhesive layer is disposed between the first side wall and/or the second side wall of the unit cell and the daughter board.

Meanwhile, the embodiment of the application also provides a vehicle which comprises the battery pack.

In summary, the embodiment of the application provides a battery pack and a vehicle with the battery pack, wherein at least two partition boards are arranged at intervals along a first direction, each partition board comprises a plurality of sub-boards which are arranged along a second direction, a containing cavity is defined between the two sub-boards which are oppositely arranged along the first direction, a first side wall of a single battery is connected with an adjacent sub-board, and an included angle is formed between the two adjacent sub-boards along the second direction in each partition board, so that limiting of the single battery between the two partition boards is realized in the first direction and the second direction, and connection reliability between the single battery and the partition boards can be improved; in addition, gaps are formed between adjacent single batteries, so that the damage and diffusion caused by mutual extrusion between the adjacent single batteries can be avoided, and the single batteries can be conveniently detached and maintained through the gaps; in addition, the partition plate can also serve as an inner beam, so that the space utilization rate of the battery pack is improved, and in addition, the inner flow passage of the partition plate is provided with the effect of the liquid cooling plate and the dimension T of the flow passage is reduced ₂ Thickness T of the daughter board ₁ The ratio of the two is limited, so that the flow of the heat conduction fluid in the flow channel is ensured, the temperature of the single battery is effectively regulated, the rigidity of the partition plate is ensured, and the structural strength of the battery pack is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a battery pack according to an embodiment of the present application;

FIG. 2 is an exploded view of FIG. 1;

fig. 3 is a schematic diagram of a combined structure of a separator and a unit cell in a battery pack according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a partially exploded structure of a separator and a unit cell in a battery pack according to an embodiment of the present disclosure;

FIG. 5 is a cross-sectional view taken along A-A of FIG. 3;

FIG. 6 is an enlarged schematic view of the structure at B of FIG. 5;

fig. 7 is a schematic structural view of a separator in a battery pack according to an embodiment of the present application;

fig. 8 is a schematic view showing a partial structure of a separator in a battery pack according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a unit cell in a battery pack according to an embodiment of the present application.

The main reference numerals illustrate:

1. the battery pack comprises 10, a single battery, 11, a first side wall, 12, a second side wall, 13, a third side wall, 14, a fourth side wall, 15, a bottom wall, 16, a top wall, 20, a partition board, 20a, a first partition board, 20b, a second partition board, 21, a daughter board, 211, a first surface, 212, a second surface, 22, a flow channel, 221, an inner side wall, 23, a reinforcing rib, 24, a connecting part, 25, a liquid inlet, 26, a liquid outlet, 30, a box body, 40, a liquid inlet pipe, 41, a liquid supply port, 50, a liquid outlet pipe, 51, a liquid return port, 60 and a connecting sheet;

x, first direction, Y, second direction, Z, third direction, W and fourth direction.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is presented herein for purposes of illustration only and is not intended to limit the application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" means two or more, unless specifically defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

In the embodiment of the application, "parallel" refers to a state in which the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is-1 to 1. The term "perpendicular" refers to a state in which an angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89 ° to 91 °. The equal distance or angle means a state where the tolerance range is-1%.

The present embodiment provides a vehicle including a battery pack.

In some embodiments, a battery pack 1 is provided, referring to fig. 1 to 9, the battery pack 1 includes: a unit cell 10 and a separator 20.

In some embodiments, referring to fig. 9, the battery cell 10 includes oppositely disposed first and second sidewalls 11 and 12. The number of the partitions 20 is plural, specifically, referring to fig. 1 to 4 and fig. 7 to 8, in the illustrated embodiment, the number of the partitions 20 is 12, and the partitions 20 are arranged at intervals along the first direction X, each partition 20 includes a plurality of connected sub-boards 21, the plurality of sub-boards 21 are sequentially arranged along the second direction Y, an included angle is formed between two adjacent sub-boards 21 along the second direction Y, the radian of the included angle is αrad, pi/2 < α < pi, and referring to fig. 8, the openings of the two included angles adjacently arranged along the second direction Y are opposite, so-called "opposite directions", that is, the two included angles adjacently arranged along the second direction Y are alternately distributed on two sides of the partition 20 along the first direction X, so that the partition 20 has a fold line structure. Each of the separators 20 may be integrally manufactured, for example, by bending a flat plate, so that the manufacturing process of the separator 20 can be greatly simplified and the manufacturing cost can be reduced.

Wherein the first direction X intersects the second direction Y, in particular, in the embodiment shown in fig. 3, the first direction X is perpendicular to the second direction Y. The number of the separators 20 is two or more, specifically, in the illustrated embodiment, the number of the separators 20 is 12, and the separators 20 are arranged at intervals in the first direction X, and in other implementations, the number of the separators 20 may be adjusted according to the capacity use requirement of the battery pack 1, which is not limited herein. The number of the sub-boards 21 on each partition board 20 is 8, in other implementations, the number of the sub-boards 21 in each partition board 20 can be adjusted according to practical use requirements, but in some embodiments, the minimum number of the sub-boards 21 in each partition board 20 is 3 to 6, that is, two included angles, which are adjacently arranged along the second direction Y in each partition board 20, are ensured to be alternately distributed on two sides of the partition board 20 along the first direction X.

Referring to fig. 1 to 5, in two adjacent separators 20 in the first direction X, the sub-plate 21 of one separator 20 is disposed opposite to the sub-plate 21 of the other separator 20 and defines a receiving chamber, at least one unit cell 10 is disposed in the receiving chamber, the first side wall 11 and the second side wall 12 of the unit cell 10 are respectively connected to the sub-plate 21 defining the receiving chamber, specifically, referring to fig. 1 to 4, two adjacent separators 20 in the first direction X include a first separator 20a and a second separator 20b, at least part of the sub-plates 21 in the first separator 20a and at least part of the sub-plates 21 in the second separator 20b are in one-to-one correspondence, a receiving chamber is defined between the two sub-plates 21 in one-to-one correspondence, specifically, in the illustrated embodiment, one unit cell 10 is disposed in each receiving chamber, the first side wall 11 of the unit cell 10 is connected to the sub-plate 21 in the first separator 20a, and the second side wall 12 is connected to the sub-plate 21 in the second separator 20 b. Because the included angle is formed between the two sub-boards 21 adjacent to each other along the second direction Y, the partition board 20 has a fold line structure, so that the single battery 10 arranged in the accommodating cavity can be subjected to double limiting and fixing in the first direction X and the second direction Y, the single battery 10 is prevented from moving in the second direction Y, the two partition boards 20 are distributed at intervals along the first direction X, the limiting and fixing of the single battery 10 in the first direction X can be realized, the single battery 10 cannot move at the position, the fixing of the single battery 10 in the horizontal direction is realized, the loss of other parts and materials required for fixing the single battery 10 is reduced, the connection reliability between the single battery 10 and the partition board 20 is ensured, and the overall reliability of the battery pack 1 is further improved. The separator 20 can replace an inner beam structure of the battery pack 1, plays a role in guiding and supporting the single battery 10, reduces the types and the number of components in the battery pack 1, realizes the integration of functions, reduces the cost of the battery pack 1, and realizes the effect of light weight of the battery pack 1.

In other embodiments, at least some of the sub-boards 21 of the first partition board 20a and at least some of the sub-boards 21 of the second partition board 20b are in one-to-one correspondence, and a housing cavity is defined between the two sub-boards 21 in one-to-one correspondence, and at least some of the housing cavities are respectively provided with one single battery 10, that is, not all of the housing cavities are provided with single batteries 10.

In some embodiments, there is a gap between two unit cells 10 adjacent at least in part in the second direction Y through which the unit cells 10 can be detached or attached. In an application scenario, when a certain cell 10 is damaged, it can be removed by a gap in the vicinity thereof as a break. In another application scenario, after the battery cell 10 pack is used for a long time, the battery cell 10 pack can be aged, and when the battery cell 10 pack cannot continue to work in a normal state, each battery cell 10 can be disassembled through a gap so as to be utilized in a ladder manner. The disassembled single battery 10 can be applied to some charge and discharge fields with low requirements, and the maintenance economy of the battery pack is improved.

In some embodiments, referring to fig. 1 and 2, the battery pack 1 further includes a case 30. The plurality of single batteries 10 are accommodated in the box 30, are borne on the bottom of the box 30, are sequentially arranged along the second direction Y between two adjacent partition boards 20 in the first direction X, and are clamped between the two adjacent partition boards 20. The first direction X in the present embodiment is parallel to the width direction of the case 30, and the second direction Y is parallel to the length direction of the case 30, so that the internal space of the case 30 can be fully utilized, the internal space utilization rate of the case 30 can be improved, and more unit batteries 10 can be installed in the case 30 under the condition that the internal space of the case 30 is determined, and the capacity of the battery pack 1 can be improved. In other embodiments, the first direction X may form an angle with the width direction of the case 30, and the second direction Y may form an angle with the length direction of the case 30.

The shape of the case 30 is not limited. The case 30 is not essential, and in some embodiments, the battery pack 1 is mounted on the vehicle, and the separator 20 and the unit cells 10 may be directly mounted on the body of the vehicle. In this embodiment, the box 30 is used for being mounted on a vehicle body of the vehicle, and the length direction or the width direction of the box 30 is parallel to the length direction or the width direction of the vehicle body, so that the accommodating space in the length direction of the vehicle body can be fully utilized, excessive space occupation in the width direction of the vehicle body is avoided, assembly and assembly of other components on the vehicle body are facilitated, and the space utilization rate is improved. It will be appreciated that in other embodiments, the length of the housing 30 may intersect the length or width of the vehicle body, as not limited herein. Generally, when the battery pack with the structure is mounted on the vehicle body, the partition plate has a limiting effect on the single battery 10 in the length direction of the vehicle body, so that the acting force of acceleration and deceleration in the running process of the vehicle in the second direction Y applied to the single battery 10 can be fully counteracted, and the service life of the battery pack is prolonged.

In some embodiments, referring to fig. 5 and 6, a flow channel 22 for flowing a heat conducting fluid is provided in the partition 20, the flow channel 22 penetrating at least a part of the sub-plates 21 along the extending direction of the partition 20, each sub-plate 21 having a dimension T in the fourth direction W ₁ Wherein the fourth direction W intersects the plane of the first side wall 11, i.e. the fourth direction W intersects the plane of the sub-board 21, preferably, referring to FIG. 4, the fourth direction W is perpendicular to the first side wall 11, T ₁ For the thickness of the sub-plate 21, the dimension of the flow channel 22 in the fourth direction W is T ₂ I.e., the width of the flow channel 22, satisfies: t is more than or equal to 0.4 ₂ /T ₁ < 0.96, in particular T ₂ /T ₁ The value of (2) may be any one of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.96 or a value between any two of them. When T is ₂ /T ₁ The ratio of (2) is less than a lower limit of 0.4, e.g. T ₂ /T ₁ When the space in the separator 20 is constant, =0.3, the thickness T of the seed plate 21 is determined ₁ Oversized, inside of the partition 20The flow passage 22 of the battery pack is too narrow in width to accommodate little heat transfer fluid and cannot effectively and rapidly regulate the temperature of the battery cell 10; when T is ₂ /T ₁ Exceeding an upper limit, e.g. T ₂ /T ₁ =0.98, the flow channel 22 occupies most of the space of the separator 20, and in this case, the rigidity of the separator 20 is poor, and the structural strength of the battery pack 1 cannot be effectively improved. When T is ₂ /T ₁ In the above range, the flow rate of the heat transfer fluid in the flow passage 22 is ensured, so that the temperature of the unit cell 10 is effectively regulated, and the rigidity of the partition plate 20 is ensured, so that the structural strength of the battery pack 1 is ensured. The flow channels 22 in the partition board 20 are opened, heat-conducting fluid can be injected into the partition board 20, the partition board 20 is in contact with the first side wall 11 or the second side wall 12 of the single battery 10, and the partition board 20 can regulate the temperature (raise the temperature, heat or lower the temperature, cool) of the single battery 10 through the heat-conducting fluid in the partition board 20, so that the single battery 10 is kept in a proper working temperature range.

In other preferred embodiments, 0.7.ltoreq.T ₂ /T ₁ T.ltoreq.0.94, more preferably 0.83.ltoreq.T ₂ /T ₁ ≤0.92。

In some embodiments, the flow channels 22 sequentially penetrate at least part of the sub-boards 21 in the partition board 20 along the extending direction of the partition board 20, specifically, in this embodiment, the flow channels 22 penetrate each sub-board 21, and referring to fig. 2, 4 and 7, both ends of the partition board 20 in the second direction Y are respectively provided with a liquid inlet 25 and a liquid outlet 26, and the flow channels 22 are respectively communicated with the liquid inlet 25 and the liquid outlet 26.

In some embodiments, 0.4T ₂ /T ₁ ≤0.96，0.3mm≤T ₁ 15mm or less, specifically T ₁ Can be any value of 0.3mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm or a value between any two values thereof. When T is ₁ Below 0.3mm, the partition board 20 is too thin, has weak strength, cannot effectively play a role in conducting stress, is extremely easily damaged under actual working conditions, and cannot realize corresponding functions; when T is ₁ Beyond 15mm, the separator 20 is too thick, occupies more internal space of the battery pack 1, and reduces the energy density and space utilization of the whole pack. PreferablyT is less than or equal to 1.5mm ₁ Not more than 11.5mm, so that the energy density and the space utilization rate of the battery pack 1 can be ensured while the rigidity of the separator 20 is ensured; more preferably, 2.5 mm.ltoreq.T ₁ Less than or equal to 8.5mm. When T is ₁ When the temperature is within the above range, the rigidity of the separator 20 can be ensured, and the excessive space inside the case 30 of the battery pack 1 can be prevented from being occupied, thereby improving the space utilization of the whole pack. Wherein T is ₁ And T ₂ The measurement can be performed by a laser thickness gauge or a vernier caliper, and the average value is obtained after the measurement is performed for a plurality of times.

In some embodiments, 0.4T ₂ /T ₁ ≤0.96，0.1mm≤T ₂ Less than or equal to 9mm, specifically T ₂ The value of (2) may be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 8mm, 9mm or a range of values consisting of any two of these. When T is ₂ The flow passage 22 in the partition board 20 is too narrow and the flow rate of the heat conduction fluid in the partition board 20 is too small, which is lower than 0.1mm, and the temperature regulation effect on the single battery 10 is poor; when T is ₂ Beyond 9mm, the side wall of the sub-board 21 is thinner, resulting in a smaller rigidity of the separator 20, which is not effective in improving the structural strength of the battery pack 1. When T is ₂ When the temperature is in the above range, the flow rate of the heat conduction fluid in the partition board 20 can be ensured, the temperature control of the single battery 10 can be ensured, the rigidity of the partition board 20 can be ensured, and the structural strength of the battery pack 1 can be further ensured. Preferably 1.2 mm.ltoreq.T ₂ Less than or equal to 5.2mm, more preferably, 2.2mm less than or equal to T ₂ ≤4.8mm。

In some embodiments, 0.4T ₂ /T ₁ ≤0.96，0.3mm≤T ₁ ≤15mm，0.1mm≤T ₂ Less than or equal to 9mm, i.e.T ₁ And T ₂ While satisfying the values of the respective ranges, the T is required to be satisfied to be 0.4-T ₂ /T ₁ ≤0.96。

Wherein, referring to FIG. 7, each sub-board 21 has a first surface 211 and a second surface 212, T oppositely disposed in a direction perpendicular to the first side wall 11 or the second side wall 12 ₁ I.e. the minimum distance between the first surface 211 and the second surface 212. Referring to fig. 6, the flow passage 22 has two inner walls oppositely disposed in a direction perpendicular to the first side wall 11 or the second side wall 12Side walls 221, T ₂ For a minimum spacing between the two inner side walls 221, in some embodiments, the spacing is equal everywhere between the first surface 211 and the second surface 212, and the spacing is equal everywhere between the two inner side walls 221.

In some embodiments, referring to fig. 5, 6 and 9, the spacing between the first side wall 11 and the second side wall 12 of the unit cell 10 is T ₃ The method comprises the following steps: t is more than or equal to 0.02 ₃ /T ₁ Less than or equal to 3, specifically T ₃ /T ₁ The value of (c) may be any one of 0.02, 0.05, 0.1, 0.5, 1, 1.5, 2, 2.5, 3 or a value between any two of these values. When T is ₁ /T ₃ The ratio of (2) is less than 0.02, i.e. the thickness T of the sub-plate 21 in the partition 20 in the direction perpendicular to the first side wall 11 or the second side wall 12 ₁ Much smaller than the thickness T of the unit cell 10 in the corresponding direction ₃ The expansion deformation of the single battery 10 is too large relative to the deformation of the partition board 20, so that the partition board 20 cannot absorb the deformation of the part, the partition board 20 is obviously deformed, the flow channels 22 in the partition board 20 collapse when serious, the internal heat conduction fluid is difficult to flow or even cannot flow, the heat dissipation effect is greatly reduced, and the service performance of the single battery 10 is reduced; when T is ₁ /T ₃ The ratio of (2) exceeds 3, i.e. the thickness T of the partition 20 in the direction perpendicular to the first side wall 11 or the second side wall 12 ₁ Much greater than the thickness T of the unit cell 10 in the corresponding direction ₃ The separator 20 can absorb too strong deformation capability and far exceeds the expansion deformation space required by the single battery 10, but at this time, the separator 20 occupies too much space inside the battery pack 1, so that the energy density of the battery pack 1 is too low. When T is ₃ /T ₁ When the temperature is within the above range, the energy density of the battery pack 1 can be increased, the expansion and deformation amount of the single battery 10 can be absorbed, and the usability of the single battery 10 can be ensured. Wherein T is ₃ The average value can be obtained after a plurality of measurements are carried out by a laser thickness gauge or a vernier caliper.

In other preferred embodiments, 0.08T ₃ /T ₁ 2.ltoreq.2, more preferably 0.1.ltoreq.T ₃ /T ₁ ≤1.2。

In some embodiments, 10 mm.ltoreq.T ₃ ≤90mm, in particular T ₃ The value of (2) may be any one of 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm or a value between any two of them.

In some embodiments, referring to fig. 5 and 6, the separator 20 further includes a reinforcing rib 23, the reinforcing rib 23 is disposed in the flow channel 22, the flow channel 22 has two inner side walls 221 disposed opposite to each other in the fourth direction W, and one end of the reinforcing rib 23 is connected to one of the inner side walls 221 and the other end is connected to the other inner side wall 221. Specifically, the reinforcing ribs 23 are disposed in at least a part of the sub-plates 21 of each partition 20, the reinforcing ribs 23 are disposed in the sub-plates 21 along the extending direction of the sub-plate 21 in which they are disposed, opposite ends of the reinforcing ribs 23 in the first direction X are respectively connected to two inner side walls 221 of the flow channel 22, and the reinforcing ribs 23 in two sub-plates 21 disposed adjacently along the second direction Y may be connected or not connected, and are selected according to actual use requirements. The strength of the partition board 20 can be enhanced by the design of the reinforcing ribs 23, so that the partition board 20 is prevented from being damaged in the use process of the battery pack 1, and the fixing and limiting of the single battery 10 are ensured. Preferably, the reinforcing ribs 23 are provided in all the sub-plates 21 of each partition plate 20 in the present embodiment, and the respective reinforcing ribs 23 are connected, that is, the partition plate 20 may be in a mouth tube structure in the present embodiment.

In some embodiments, the flow channel 22 has a wall thickness T5 in the third direction Z that satisfies: t is more than or equal to 0.04 ₅ /T ₁ And 18.2, wherein the third direction Z intersects both the first direction X and the second direction Y, respectively, and specifically, in the illustrated embodiment, the third direction Z intersects both the first direction X and the second direction Y, respectively. When T is ₅ /T ₁ The ratio of (2) is lower than 0.04, the wall thickness of the flow channel 22 in the third direction Z is too small, the supporting strength of the partition plate 20 is too small, and the unit cell 10 cannot be effectively supported; when T is ₅ /T ₁ The ratio of (2) is larger than 18.2, and the wall thickness of the flow channel is too large, so that the space of the flow channel 22 in the partition board is reduced, and the heat dissipation effect is affected; when T is more than or equal to 0.04 ₅ /T ₁ When the temperature is less than or equal to 18.2, the heat dissipation effect and the supporting strength can be simultaneously achieved, and preferably T is less than or equal to 0.2 ₅ /T ₁ Less than or equal to 13, more preferably, 1 less than or equal to T ₅ /T ₁ ≤10.2。

In some embodiments, the tensile strength of separator 20 is P, and the weight of cell 10 is M, satisfying: P/M is less than or equal to 10MPa/Kg and less than or equal to 6000MPa/Kg. When P/M is less than 10MPa/Kg, the strength of the partition board 20 is too low to meet the strength requirement in the whole package; if P/M is more than 60000MPa/Kg, the performance of the separator 20 is excessive, the cost is greatly increased, when 10MPa/Kg is less than or equal to P/M is less than or equal to 6000MPa/Kg, the strength and the cost of the separator can be considered, the overall strength of the battery pack is improved, the cost is controlled, preferably 30MPa/Kg is less than or equal to P/M is less than or equal to 4000MPa/Kg, more preferably 300MPa/Kg is less than or equal to P/M is less than or equal to 2000.

In some embodiments, 100 MPa.ltoreq.P.ltoreq.420 MPa,0.5 Kg.ltoreq.M.ltoreq.3 Kg; in other preferred embodiments, 130 MPa.ltoreq.P.ltoreq.360 MPa,0.9 Kg.ltoreq.M.ltoreq.2.2 Kg.

In some embodiments, the stiffener 23 has a thickness T in the third direction Z ₄ Wherein, preferably, 0.03.ltoreq.T ₄ /T ₁ 16.7 or less, specifically T ₄ /T ₁ The ratio of (c) may be any one of or a value between any two of 0.03, 0.05, 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 16.7. When T is ₄ /T ₁ The ratio of (2) is less than 0.03, and the thickness of the rib 23 is too small to form a support for the separator 20. When T is ₄ /T ₁ The ratio of (2) is higher than 16.7, the thickness of the reinforcing ribs 23 is too large, and the reinforcing ribs occupy too much space of the flow channel 22, so that the flow rate of the heat conduction fluid in the flow channel 22 is influenced, and the thermal management of the single battery 10 is further influenced. When the thickness T of the reinforcing rib 23 ₄ Thickness T of the daughter board 21 ₁ When the ratio of (2) is in the above range, the structural support of the partition board 20 can be ensured, the strength of the partition board 20 is improved, and meanwhile, the space of the flow channel 22 in the partition board 20 is not excessively occupied, enough space is provided for circulation of heat conduction fluid, and the dual-harvest of strength and heat management effect is realized. Wherein the third direction Z intersects both the first direction X and the second direction Y, respectively, in particular, in the illustrated embodiment, the third direction Z is orthogonal to both the first direction X and the second direction Y, respectively.

In some embodiments, 0.03T ₄ /T ₁ ≤16.7，0.5mm≤T ₄ Less than or equal to 5mm, specifically T ₄ The value of (C) may be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm or a range of values consisting of any two of these values. When T is ₄ In this range, the structural support of the separator 20 and the space of the flow passage 22 in the separator 20 can be satisfied, and the heat transfer fluid can flow. Wherein T is ₄ The average value can be obtained after a plurality of measurements are carried out by a laser thickness gauge or a vernier caliper.

In some embodiments, the stiffener 23 is disposed within at least one of the sub-plates 21 of the spacer 20. In some embodiments, the reinforcing ribs 23 are provided in each sub-board 21, and the number of reinforcing ribs 23 in each sub-board 21 is at least one. Thickness T of the reinforcing rib 23 in the third direction Z ₄ And the number of the reinforcing ribs 23 in each sub-board 21 can be adjusted according to the actual use requirements, and is not limited herein.

In some embodiments, referring to fig. 3 and 8, two sub-boards 21 disposed adjacent to each other in the second direction Y in the partition 20 are sequentially connected, and specifically, two sub-boards 21 disposed adjacent to each other in the second direction Y are directly connected.

In some embodiments, referring to fig. 2, 4 and 7, the partition 20 further includes a connection portion 24, two sub-boards 21 adjacently disposed along the second direction Y are connected by the connection portion 24, the flow channel 22 penetrates through the connection portion 24, and an inner wall surface of the flow channel 22 penetrated in the connection portion 24 is an arc surface, so that smooth connection between the two adjacent sub-boards 21 is achieved, so that a flow resistance of the heat-conducting fluid flowing in the flow channel 22 is reduced when flowing through the connection portion, a heat exchange rate with the unit cell 10 is improved, and a thermal management effect is enhanced.

In some embodiments, an adhesive layer (not shown) is provided between the first and/or second sidewalls 11 and 12 of the unit cell 10 and the adjacent sub-board 21. The design of the adhesive layer can further ensure the fixation and limitation of the single battery 10. The adhesive layer may be a heat-conducting adhesive, which is coated on the surface of the sub-board 21, and/or the heat-conducting adhesive is coated on the first side wall 11 and/or the second side wall 12 of the unit cell 10, so as to achieve adhesive connection between the first side wall 11 and/or the second side wall 12 of the unit cell 10 and the adjacent sub-board 21.

In some embodiments, referring to fig. 9, the single battery 10 further includes a third side wall 13 and a fourth side wall 14 which are disposed opposite to each other, and a bottom wall 15 and a top wall 16 which are disposed opposite to each other, where the first side wall 11, the third side wall 13, the second side wall 12 and the fourth side wall 14 are connected end to end in order to form a hollow cube structure with two open ends, the bottom wall 15 and the top wall 16 respectively cover the openings at two ends of the hollow cube structure, so that the first side wall 11, the third side wall 13, the second side wall 12, the fourth side wall 14, the bottom wall 15 and the top wall 16 enclose a hexahedral structure together, the first side wall 11 and the second side wall 12 are surfaces with the largest surface area of the hexahedral structure, the two surfaces with the largest surface area of the single battery 10 are connected with the sub-board 21 of the partition board 20, the two surfaces with the largest surface area of the single battery 10 are connected with the sub-board 21 during charge and discharge operations, the heat exchange of the single battery 10 can be realized to a larger extent, and the thermal management effect is improved.

In other embodiments, the third sidewall 13 and the fourth sidewall 14 of the single battery 10 are respectively connected to the adjacent sub-board 21, that is, two sides of the single battery 10 with relatively smaller surface area are connected to the sub-board 21, so that more single batteries 10 can be sandwiched between the two separators 20, and the capacity of the battery pack 1 can be improved, which can be specifically selected according to practical use requirements.

In some embodiments, referring to fig. 1 and 2, the battery pack 1 further includes: a liquid inlet pipe 40, a liquid outlet pipe 50 and a connecting sheet 60. The liquid inlet pipe 40 extends along the first direction X, the liquid inlet 25 of a plurality of baffles 20 respectively communicates with the liquid inlet pipe 40, one end of the liquid inlet pipe 40 in the first direction X is provided with a liquid supply port 41, the liquid supply port 41 is located outside the box 30, the liquid outlet pipe 50 extends along the first direction X, the liquid inlet pipe 40 and the liquid outlet pipe 50 are arranged at intervals along the second direction Y, the liquid outlet 26 of a plurality of baffles 20 respectively communicates with the liquid outlet pipe 50, the liquid inlet pipe 40 and the liquid outlet pipe 50 are communicated through the flow channel 22 in the baffles 20, one end of the liquid outlet pipe 50 in the first direction X is provided with a liquid return port 51, and the liquid return port 51 is located outside the box 30. The design of feed liquor pipe 40 can be connected with the feed liquor mouth 25 of a plurality of baffles 20 respectively, can pour into heat conduction fluid simultaneously in a plurality of baffles 20 through a feed liquor mouth 41, and the drain pipe 50 establishes the setting, can be connected with the liquid outlet 26 of a plurality of baffles 20 respectively, can realize the recovery of heat conduction fluid in the baffle 20 through a return liquor mouth 51 to realize heat conduction fluid's circulation, promote heat conduction fluid's utilization ratio, and can avoid taking up excessive space in the box 30, promote space utilization, and can realize the thermal management to a plurality of battery cells 10 in the battery package 1.

The connection piece 60 is used to connect two adjacent unit batteries 10. The connection piece 60 is an aluminum connection piece. The design of the connecting sheet 60 can realize the serial connection or parallel connection of a plurality of single batteries 10 in the battery pack 1, and integrate the plurality of single batteries 10 to form a battery pack, so that the battery pack 1 can conveniently provide electric energy for vehicles.

The foregoing has outlined the detailed description of the embodiments of the present utility model, and the detailed description of the principles and embodiments of the present utility model is provided herein by way of example only to facilitate the understanding of the method and core concepts of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present utility model, the present description should not be construed as limiting the present utility model.

Claims (13)

1. A battery pack, comprising:

a plurality of single cells (10), wherein the single cells (10) comprise a first side wall (11) and a second side wall (12) which are oppositely arranged;

the plurality of partition boards (20) are arranged at intervals along a first direction (X), the partition boards (20) comprise a plurality of connected sub-boards (21), the plurality of sub-boards (21) are arranged along a second direction (Y), an included angle is formed between two adjacent sub-boards (21), the radian of the included angle is alpha rad, pi/2 < alpha < pi is met, and the first direction (X) is intersected with the second direction (Y);

in two adjacent clapboards (20), a sub-board (21) of one clapboard (20) is opposite to the sub-board (21) of the other clapboard (20) and defines a containing cavity, and at least one single battery (10) is arranged in the containing cavity;

wherein, a flow passage (22) is arranged in the partition board (20), the flow passage (22) penetrates through at least part of the sub-board (21) along the extending direction of the partition board (20), and the dimension of the sub-board (21) in the fourth direction (W) is T ₁ The flow channel (22) has a dimension T in the fourth direction (W) ₂ The method comprises the following steps: t is more than or equal to 0.4 ₂ /T ₁ And < 0.96, said fourth direction (W) intersecting a plane in which said first side wall (11) lies.

2. The battery pack of claim 1, wherein 0.3mm +.t ₁ 15mm or less, and/or T or less of 0.1mm or less ₂ ≤7mm。

3. The battery pack according to claim 1, wherein a spacing between the first side wall (11) and the second side wall (12) of the unit cell (10) is T ₃ The method comprises the following steps: t is more than or equal to 0.02 ₁ /T ₃ ≤3。

4. A battery pack according to claim 3, wherein the single battery (10) further comprises a third side wall (13) and a fourth side wall (14) which are oppositely arranged, and a bottom wall (15) and a top wall (16) which are oppositely arranged, the first side wall (11), the third side wall (13), the second side wall (12) and the fourth side wall (14) are sequentially connected end to form a hollow cube structure with two open ends, the bottom wall (15) and the top wall (16) respectively cover the two open ends, and the first side wall (11) and the second side wall (12) are surfaces with the largest surface areas.

5. The battery pack according to claim 1, wherein the flow channel (22) has a wall thickness T in a third direction (Z) ₅ The method comprises the following steps: t is more than or equal to 0.04 ₅ /T ₁ And the third direction (Z) is less than or equal to 18.2, and the first direction (X) and the second direction (Y) are intersected.

6. The battery pack according to claim 1, wherein the tensile strength of the separator (20) is P, and the weight of the unit cell (10) is M, satisfying: P/M is less than or equal to 10MPa/Kg and less than or equal to 6000MPa/Kg.

7. The battery pack of claim 6, wherein the battery pack satisfies: P/M is less than or equal to 30MPa/Kg and less than or equal to 840MPa/Kg.

8. The battery pack according to claim 1, wherein the separator (20) further comprises a reinforcing rib (23), the reinforcing rib (23) is disposed in the flow channel (22), the flow channel (22) has two inner side walls (221) disposed opposite to each other in the fourth direction (W), and one end of the reinforcing rib (23) is connected to one of the inner side walls (221) and the other end is connected to the other inner side wall (221).

9. The battery pack according to claim 8, wherein the reinforcing rib (23) has a thickness T in the third direction (Z) ₄ The method comprises the following steps: t is more than or equal to 0.03 ₄ /T ₁ Less than or equal to 16.7, and/or meets the following conditions: t is more than or equal to 0.5mm ₄ And the thickness is less than or equal to 5mm, wherein the third direction (Z) is intersected with the first direction (X) and the second direction (Y).

10. The battery pack according to claim 8, wherein the separator (20) further comprises a connecting portion (24), adjacent two of the sub-boards (21) are connected by the connecting portion (24), and the flow passage (22) penetrates the connecting portion (24); the inner wall surface of the flow passage (22) penetrating through the connecting part (24) is an arc surface.

11. The battery pack according to claim 1, wherein an adhesive layer is provided between the first side wall (11) and/or the second side wall (12) of the unit cell (10) and the sub-board (21).

12. The battery pack of claim 1, wherein the battery pack satisfies: t is more than or equal to 0.7 ₂ /T ₁ ≤0.94。

13. A vehicle comprising a battery pack according to any one of claims 1 to 12.

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