CN112151699B

CN112151699B - Battery pack and vehicle

Info

Publication number: CN112151699B
Application number: CN201910579497.XA
Authority: CN
Inventors: 廉玉波; 凌和平; 黄伟; 熊永; 刁义伟
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2022-05-13
Anticipated expiration: 2039-06-28
Also published as: CN112151699A

Abstract

The invention provides a battery pack and a vehicle, which comprise a battery tray and a battery module, wherein the battery tray comprises a panel and a hollow protective beam extending along the longitudinal direction; the panel is sunken downwards to form a cavity; the battery module is arranged in the cavity and comprises a plurality of battery cells which are longitudinally arranged and a confluence assembly which is electrically connected with all the battery cells, and each battery cell is provided with a first explosion-proof pressure release valve; the protection beam is arranged in the cavity, drainage holes which correspond to the first explosion-proof pressure relief valves one to one are formed in the protection beam, and the drainage holes are used for guiding the jet of the first explosion-proof pressure relief valves into the protection beam. Realize subtracting heavy this and reduce the space and occupy, every electric core all has independent first explosion-proof relief valve for the jet can be followed the leading-in protection beam of first explosion-proof relief valve, avoids influencing each other between the electric core.

Description

Battery pack and vehicle

Technical Field

The invention belongs to the field of power batteries, and particularly relates to a battery pack and a vehicle.

Background

The basic structure of the existing power battery system of the electric automobile is mainly as follows: a plurality of battery monomers are connected in series and parallel to form a battery module, and then the plurality of modules are connected in series and packaged in a battery tray to form a battery pack. In general, in order to seek a higher electric quantity, one battery system is composed of several tens of battery modules, and the contradiction between the requirement for a limited space and a light weight and the requirement for a greater number of battery modules is more prominent.

The power battery package of current square shell electricity core is through the series-parallel battery module of constituteing of a plurality of little square shell electricity cores, and every battery package will arrange tens of modules again, has following drawback:

1) because each battery module has independent accessories such as end plates, side plates, busbars, data collectors, etc., a large number of battery module accessories can increase the weight and manufacturing cost of the entire battery pack.

2) Each battery module needs an independent mounting point, and a safety gap is reserved between each battery module and the corresponding battery module, so that a large amount of space is occupied, and the space utilization rate of the battery pack is greatly reduced.

3) Generally, a bus bar or a power line is required to be connected in series between the battery modules, and the more the battery modules are connected in series, the more the weight is increased, and the loss of the flow rate is increased.

4) Each battery module usually needs an independent thermal management and data acquisition system, which increases the structural complexity of the battery pack and also increases the cost.

5) Too many battery modules cause poor electrical performance consistency among the battery modules, and the consistency of the battery modules directly affects the performance of the whole battery system.

The battery tray of present battery package generally can be equipped with waterproof ventilative valve structure on, and the purpose is when extreme condition appears in the battery module, can be one-way with the gas drainage of battery release in the battery package away to the protection battery module. The existing battery pack is characterized in that a waterproof vent valve is arranged on a battery tray upper cover and comprises a base body and a waterproof vent membrane, the base body is provided with an air vent communicated with a vent hole, the waterproof vent membrane is fixed on the outer surface of the battery tray and covers the base body, the waterproof vent membrane is constructed to be provided with a damaged hole communicated with the air vent when the pressure in the battery tray is greater than the pressure outside the battery tray, and the existing battery pack still has the following defects:

1) the purpose of pressure release can only be reached to a certain extent, and when a certain electric core in the battery pack has taken place under the extreme condition, the pressure in the battery tray can not reach the threshold value of pressure release this moment, and waterproof ventilation valve can not play a role. However, an electric core in an extreme case can affect an adjacent electric core, so that chain reaction is formed through wide propagation, the waterproof vent valve only plays a role after certain pressure is accumulated, the danger degree is accumulated to be high, uncontrollable risks are increased, and loss of multi-electric core chain reaction is increased.

2) The waterproof vent valve is arranged on the upper cover close to the passenger compartment of the automobile body, and the pressure relief direction can cause damage to the automobile passengers.

3) The waterproof ventilation valve has weak structural strength and poor stability.

4) The battery tray only protects dangerous situations of releasing a large amount of gas when an electric core in the battery tray has extreme situations, but does not protect other dangerous situations such as leakage, fire and the like of a battery pack.

Disclosure of Invention

The invention aims to provide a battery pack and a vehicle, and aims to solve the technical problem that in the existing scheme, explosion-proof pressure relief cannot be carried out on a single battery cell, so that the battery cells are influenced mutually under an extreme condition.

In order to achieve the purpose, the invention adopts the technical scheme that: the battery pack comprises a battery tray and a battery module, wherein the battery tray comprises a panel and a hollow protective beam extending along the longitudinal direction;

the panel is sunken downwards to form a cavity;

the battery module is arranged in the cavity and comprises a plurality of battery cores which are arranged along the longitudinal direction and a confluence assembly which is in conductive connection with all the battery cores, and each battery core is provided with a first explosion-proof pressure release valve;

the protection beam is arranged in the cavity, drainage holes in one-to-one correspondence with the first explosion-proof pressure release valves are formed in the protection beam, and the drainage holes are used for guiding the jet of the first explosion-proof pressure release valves into the protection beam.

Further, the first explosion-proof pressure relief valve is arranged on the transverse outer side of the battery cell; the protection beam is located between the transverse outer side of the battery module and the transverse inner side wall of the cavity.

Furthermore, the positive pole and the negative pole of each battery cell are respectively arranged at two transverse sides of the battery cell, and the two protective beams are distributed at two transverse sides of the panel;

and the two transverse sides of the battery cell are respectively provided with one first explosion-proof pressure release valve.

Further, the first explosion-proof relief valve is arranged below the pole.

Further, the protection beam is connected with the bottom wall and the transverse inner side wall of the cavity.

The panel and the protection beam are provided with a second explosion-proof pressure relief valve corresponding to the second explosion-proof pressure relief valve;

the second explosion-proof relief valve is arranged outside the relief through hole and communicated with the panel and the relief through hole on the protective beam or

The second explosion-proof relief valve is embedded in the panel or the leakage through hole on the protection beam and correspondingly communicated with the protection beam or the leakage through hole on the panel or

The second explosion-proof pressure relief valve is embedded in the pressure relief through hole on the panel or the protection beam;

the two ends of the protection beam are closed.

Further, the orientation of protection roof beam one side of battery module with the laminating of battery module deviates from one side of battery module with the inside wall laminating of cavity.

Further, the top side of the protection beam is gradually inclined downward in a direction away from the battery module.

Further, the battery tray also comprises hollow longitudinal side beams;

the battery module is characterized in that longitudinal side beams extending transversely are fixed on the two longitudinal sides of the cavity, the longitudinal side beams are connected with the bottom wall and the longitudinal inner side wall of the cavity, and the battery module is located between the two longitudinal side beams.

Furthermore, one side of the longitudinal side beam, which faces the battery module, is attached to the battery module, and one side of the longitudinal side beam, which faces away from the battery module, is attached to the inner side wall of the cavity; one side of the longitudinal side beam, which is close to the battery module, is higher than one side of the longitudinal side beam, which is far away from the battery module.

Furthermore, a protrusion for heightening the longitudinal side beam is arranged on one side of the top side of the longitudinal side beam close to the battery module, or the top side of the longitudinal side beam is provided with an inclined surface.

Further, the bottom wall of the cavity is recessed to form a plurality of panel reinforcing parts protruding downwards.

Furthermore, a lifting lug structure used for lifting the battery pack on the vehicle body is arranged outside the battery tray;

the lifting lug structure comprises an upper supporting part, a bottom support, a lining plate and a sleeve;

the upper supporting part is formed on the outer side wall of the cavity;

one end of the bottom support extends to the bottom of the panel, and the other end of the bottom support is provided with a lower supporting part;

the lining plate is positioned between the upper supporting part and the lower supporting part and is respectively fixed with the upper supporting part and the lower supporting part;

the sleeve is located go up the supporting part with between the welt, and respectively with go up the supporting part with the welt is fixed.

Further, go up the supporting part and be several fonts, the lower support part with the welt is the font of falling several fonts respectively, just go up the supporting part the welt with the lower support part is laminated in proper order and is welded.

Further, the busbar assembly comprises a busbar support, a coupling busbar and a lead-out busbar;

the bus bar supports are respectively arranged on two transverse sides of the battery module, the battery cell is positioned between the two bus bar supports, the connecting bus bars are arranged on the two bus bar supports, and the leading-out bus bars are arranged on at least one bus bar support;

the positive pole column of one of the two electric cores distributed on the outermost side in the longitudinal direction and the negative pole column of the other electric core are respectively connected with one lead-out busbar, the rest of the pole columns are connected with the connection busbar, and each connection busbar is connected with more than two adjacent pole columns.

Further, on each side of the battery module along the transverse direction, the positive pole posts and the negative pole posts are alternately arranged;

the two leading-out busbars are arranged on one busbar support or are respectively arranged on the two busbar supports.

Furthermore, a plurality of accommodating grooves distributed along the longitudinal direction and a plurality of accommodating holes distributed along the longitudinal direction are formed in the bus bar support, and the accommodating grooves are located on one side, away from the battery core, of the bus bar support;

the two accommodating grooves are respectively embedded with one leading-out bus bar, the groove wall of the accommodating groove for accommodating the leading-out bus bar is provided with one accommodating hole, the other accommodating grooves are respectively embedded with one connecting bus bar, and the groove wall of the accommodating groove for accommodating the connecting bus bar is provided with two accommodating holes;

the pole posts correspondingly extend into the accommodating holes one by one and are fixedly connected with the corresponding lead-out bus bars or the corresponding connecting bus bars.

Further, the coupling bus bar and the receiving groove for receiving the coupling bus bar are in a shape of a letter;

the top of the connecting bus bar is bent to form an acquisition end used for being connected with a data acquisition unit, and the acquisition end is positioned on the upper side of the battery module.

Further, be equipped with explosion-proof pressure release accommodation hole on the busbar support, first explosion-proof relief valve with explosion-proof pressure release accommodation hole one-to-one, explosion-proof pressure release accommodation hole intercommunication first explosion-proof relief valve with the drainage hole.

Further, the insulating device also comprises a side surface insulating sheet, a bottom insulating sheet, a heat-insulating layer and an end surface insulating sheet;

the side surface insulation sheets are arranged on the sides, away from each other, of the two bus bar supports;

the bottom insulating sheet and the heat-insulating layer are sequentially arranged at the bottom of the battery cell;

a plurality of the battery cores are provided with the end face insulation sheets along two longitudinal outer sides.

The invention also provides a vehicle comprising the battery pack.

The battery pack and the vehicle provided by the invention have the beneficial effects that: compared with the prior art, each battery cell of the battery module is provided with an independent first explosion-proof pressure release valve, when each battery cell in the battery pack singly has dangerous conditions such as gas, liquid leakage, fire and the like, the dangerous conditions can be sprayed out from the first explosion-proof pressure release valves E and guided into the protection beam through the drainage holes, other battery cells are prevented from being influenced due to the fact that the single battery cell has extreme conditions, danger is reduced to the maximum extent, and influence on the surrounding battery cells is reduced to the minimum; the protective beam can also reinforce the panel.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is an exploded view of a partial structure of a battery pack according to an embodiment of the present invention;

fig. 2 is an exploded view of the battery module shown in fig. 1;

fig. 3 is a schematic diagram of cell arrangement of the battery module shown in fig. 2;

fig. 4 is a partial structural view of the bus bar assembly of fig. 2 located at one side of the battery module;

fig. 5 is a partial structural view of the bus bar assembly shown in fig. 2 located at the other side of the battery module;

FIG. 6 is a schematic perspective view of the coupling bus bar shown in FIG. 2;

fig. 7 is a schematic perspective view of the lead-out bus bar shown in fig. 2;

fig. 8 is a schematic perspective view of the battery tray shown in fig. 1;

FIG. 9 is a perspective view of the guard beam shown in FIG. 8;

FIG. 10 is a perspective view of the guard beam of FIG. 9 from another perspective;

fig. 11 is a perspective view of the longitudinal side member shown in fig. 8;

fig. 12 is a partial enlarged view of a hoisting-related structure.

Wherein, in the figures, the respective reference numerals:

1. a battery module;

11. a cell unit; 111. an electric core; e1, a first explosion-proof pressure relief valve; e2, positive pole; e3, negative electrode posts;

12. a gasket;

13. a bus assembly;

131. a busbar support; 1311. accommodating grooves; 1312. an accommodation hole; 1313. an explosion-proof pressure relief receiving hole;

132. connecting a bus bar; 1321. a collection end;

133. leading out a busbar;

14. a temperature equalizing cover plate; 15. insulating heat-conducting glue;

161. a side surface insulation sheet; 1611. avoiding the accommodating hole; 162. a bottom insulating sheet; 163. an end face insulation sheet;

17. a heat-insulating layer;

2. a battery tray;

21. a panel; 211. a cavity; 212. a panel reinforcement portion; 213. an upper support section;

22. a protective beam; 221. a drainage hole; 222. a bleed-out through hole;

23. a second explosion-proof pressure relief valve; 24. a longitudinal side member;

252. a bottom support; 2521. a lower support section; 253. a liner plate; 254. a sleeve.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "fixed to" or "disposed on" another element, and the like, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

The transverse direction and the longitudinal direction in the application are only convenient to express and are not used for limiting the using direction, the transverse direction of the battery pack can be along the width direction of the automobile when the battery pack is used, the longitudinal direction of the battery pack can be along the length direction or the width direction of the automobile correspondingly. When the battery pack is used, the longitudinal direction of the battery pack is generally selected to be along the length direction of an automobile, and the transverse direction of the battery pack is selected to be along the width direction of the automobile.

Referring to fig. 1, fig. 2, fig. 3, fig. 8 and fig. 10 together, a battery pack according to the present invention will now be described. The battery pack comprises a battery tray 2 and a battery module 1, wherein the battery tray 2 comprises a panel 21 and a hollow protective beam 22 extending along the longitudinal direction;

the panel 21 is recessed downward to form a cavity 211;

the battery module 1 is arranged in the cavity 211, the battery module 1 comprises a plurality of battery cells 111 arranged along the longitudinal direction and a confluence assembly 13 conductively connected with all the battery cells 111, and each battery cell 111 is provided with a first explosion-proof pressure relief valve E1;

the protection beam 22 is arranged in the cavity 211, the protection beam 22 is provided with drainage holes 221 corresponding to the first explosion-proof pressure relief valves E1 one by one, and the drainage holes 221 are used for guiding the jet of the first explosion-proof pressure relief valves E1 into the protection beam 22.

Compared with the prior art, each cell 111 of the battery module 1 is provided with an independent first explosion-proof pressure release valve E1, when each cell 111 in the battery pack singly generates dangerous conditions such as gas, liquid leakage, fire and the like, dangerous conditions can be sprayed out from the first explosion-proof pressure release valves E1 and introduced into the protection beam 22 through the drainage holes 221, the influence on other cells 111 caused by the extreme condition of the single cell 111 is avoided, the danger is reduced to the maximum extent, and the influence on the surrounding cells 111 is reduced to the minimum; the protective beam 22 also reinforces the panel 21. Specifically, after the dangerous case is introduced into the protection beam 22, the dangerous case can be enclosed in the protection beam 22, and can also be led out of the protection beam 22.

Specifically, the panel 21 is made of metal; the preferred panel 21 adopts the super high strength steel, convenient finish machining, accessible hot stamping integrated into one piece for the intensity of panel 21 obtains very big promotion, for the scheme that sets up the stiffening beam in panel 21, has lightened weight. Among them, the panel reinforcement part 212 may be formed by punching a bottom wall of the cavity 211 in a vertical direction.

Specifically, the protective beam 22 is made of metal, preferably high-strength steel, and is integrally rolled, welded and formed into a cylindrical structure, so that the strength is improved and the weight is reduced.

Further, referring to fig. 1 and fig. 3 together, the first explosion-proof pressure relief valve E1 is disposed on the lateral outer side of the battery cell 111; the protective beams 22 are located between the lateral outer sides of the battery module 1 and the lateral inner side walls of the cavity 211. The battery tray 2 can play a supporting role when being extruded, and the battery module 1 is protected.

Further, referring to fig. 1 and fig. 3 together, the positive and negative poles E2 and E3 of each battery cell 111 are respectively disposed on two lateral sides of the battery cell 111, the protection beams 22 are two and distributed on two lateral sides of the panel 21, and two lateral sides of the battery cell 111 are respectively provided with a first explosion-proof pressure relief valve E1; the cell 111 can be conveniently led into the corresponding protective beam 22 nearby in case of danger.

Preferably, first explosion-proof relief valve E1 is located the below of utmost point post, reduces first explosion-proof relief valve E1's position, avoids first explosion-proof relief valve E1 and protection roof beam 22 to have the difference in height and need additionally set up the water conservancy diversion structure and will the leading-in protection roof beam 22 of the injection of first explosion-proof relief valve E1.

Further, the protection beam 22 is connected with the bottom wall and the transverse inner side wall of the cavity 211, so that the connection reliability of the protection beam 22 and the panel 21 is improved, and meanwhile, the rigidity is improved.

Preferably, the protective beam 22 is simultaneously fitted and welded to the bottom wall and the lateral inner side wall of the cavity 211, and more preferably, the bottom corner of one side of the protective beam 22, which is close to the battery module 1 (the position indicated by the arrow B in fig. 9), and the top corner of one side of the protective beam 22, which is away from the battery module 1 (the position indicated by the arrow C in fig. 9), are longitudinally welded to the inner wall of the cavity 211.

Further, referring to fig. 1, 8, 9 and 10, the battery tray further includes a second explosion-proof relief valve 23 for guiding the ejected matter in the protection beam 22 out of the battery tray 2, where the second explosion-proof relief valve 23 may be fixed only to the wall surface of the cavity 211 (specifically, the side wall or the bottom wall of the cavity 211), or only to the protection beam 22, or may be fixed to the wall surface of the cavity 211 and the protection beam 22 at the same time, so that the second explosion-proof relief valve 23 can be fixed in position and communicate the protection beam 22 with the outside.

In this way, a closed space is formed in the guard beam 22, and in the event of a dangerous situation, the dangerous situation introduced into the guard beam 22 can be discharged through the second explosion relief valve 23. Realize the explosion-proof pressure release function of battery package jointly through first explosion-proof pressure collection valve, guard beam 22 and the explosion-proof relief valve 23 of second, structural strength is high, and is reliable and stable, not only plays the effect of explosion-proof pressure release, still compromises whole battery tray 2 and supports the enhancement function.

Preferably, the second explosion-proof relief valve 23 is disposed on a side portion of the protection beam 22, two ends of the protection beam 22 are closed, specifically, the protection beam 22 may be a structure whose two ends are closed, and at least one end of the protection beam 22 is open, but the open end is connected with other structures of the battery pack in a closed manner (for example, the open end is connected with a longitudinal side wall of the cavity 211 in a closed manner), so that the protection beam 22 is in a structure whose two ends are closed when in use.

Specifically, the panel 21 and the protection beam 22 are provided with a discharge through hole corresponding to the second explosion-proof pressure release valve 23;

the second explosion-proof relief valve is arranged outside the discharge through hole and communicated with the discharge through hole on the panel and the protective beam or

The second explosion-proof relief valve is embedded in the panel or the relief through hole on the protection beam and correspondingly communicated with the relief through hole on the protection beam or the panel, or

The second explosion-proof relief valve 23 is simultaneously embedded in the relief through hole 222 on the panel 21 or the protection beam 22. The spray in the protection beam 22 can be guided out of the panel 21.

Preferably, the side of the protection beam 22 away from the battery module 1 and the panel 21 are respectively provided with a discharge through hole 222 corresponding to the second explosion-proof relief valve 23, so that the second explosion-proof relief valve 23 can guide the spray in the protection beam 22 out of the panel 21.

Specifically, the second explosion relief valve 23 is mounted on the panel 21 by bolts.

Further, referring to fig. 1, 8, 9 and 10, one side of the protection beam 22 facing the battery module 1 is attached to the battery module 1, and one side of the protection beam facing away from the battery module 1 is attached to the inner side wall of the cavity 211, so as to increase the abutting area of the protection beam 22 with the battery tray 2 and the battery module 1, and to perform a better supporting function.

Preferably, one lateral side of the protection beam 22 is a flat surface and is bonded and fixed to the battery module 1, and the other lateral side is a curved surface.

Further, referring to fig. 1, 8, 9 and 10, the top side of the protection beam 22 is gradually inclined downward in a direction away from the battery module 1 to guide the counter pressure, and the transmission of force is more reasonable.

Preferably, a side of the top side of the protection beam 22 adjacent to the lateral side wall of the cavity 211 is flush with the top of the lateral side wall of the cavity 211.

Further, referring to fig. 1, 8 and 11, the battery tray 2 further includes hollow longitudinal side beams 24;

longitudinal side beams 24 extending along the transverse direction are fixed on two longitudinal sides of the cavity 211, and the battery module 1 is located between the two longitudinal side beams 24, that is, the longitudinal side beams 24 are located outside the outer large surface of the battery cell 111 at the outermost end of the battery module 1 along the longitudinal direction. The bulging phenomenon can appear on the big face after electric core 111 uses for a long time, and electric core 111 excessively swells and not only influences electric core 111 life but also influences safety, consequently sets up and indulges curb girder 24, and it plays the effect of opposition electric core 111 inflation power to indulge curb girder 24 when electric core 111 swells on vertical.

Specifically, the longitudinal side beams 24 are made of metal, preferably high-strength steel, and are integrally rolled, welded and formed into a cylindrical structure, so that the strength is improved and the weight is reduced.

Preferably, the longitudinal side beams 24 are connected with both the bottom wall and the longitudinal inner side wall of the cavity 211, increasing the connection reliability of the longitudinal side beams 24 with the panel 21.

Preferably, the longitudinal side beams 24 are fitted and welded to both the bottom wall and the longitudinal inner side walls of the cavity 211.

Further, referring to fig. 1, 8 and 11, one side of the longitudinal side beam 24 facing the battery module 1 is attached to the battery module 1, and one side of the longitudinal side beam 24 facing away from the battery module 1 is attached to the inner side wall of the cavity 211, so as to increase the abutting area of the longitudinal side beam 24 with the battery tray 2 and the battery module 1, and to achieve a better supporting effect.

Further, referring to fig. 1, 8 and 11, the side of the longitudinal side beam 24 close to the battery module 1 is higher than the side of the longitudinal side beam 24 far from the battery module 1, so as to increase the contact area between the longitudinal side beam 24 and the battery module 1 and the side wall of the cavity 211, thereby achieving a better supporting effect.

Further, a protrusion for heightening the longitudinal side member 24 is disposed on one side of the top side of the longitudinal side member 24 close to the battery module 1 (please refer to fig. 1, 8 and 11), or the top side of the longitudinal side member 24 is provided with an inclined surface (not shown), which is beneficial to increasing the longitudinal force to be resolved to the horizontal and vertical directions, so as to achieve a better force transmission effect.

Further, please refer to fig. 8, the bottom wall of the cavity 211 is recessed to form a plurality of panel reinforcements 212 protruding downward; the panel reinforcing part 212 integrally formed on the panel 21 improves the strength of the panel 21, ensures the dimensional accuracy of the panel 21, does not need to separately arrange a reinforcing beam in the cavity 211 of the panel 21, is beneficial to reducing weight, is beneficial to increasing the effective accommodating space of the cavity 211 and improves the energy density of a battery system.

Specifically, the panel reinforcement part 212 may be an elongated reinforcement part that penetrates through the bottom wall of the cavity 211 in the transverse direction or the longitudinal direction, or may be a square reinforcement part, and a plurality of square reinforcement parts may increase the structural rigidity of the panel reinforcement part 212 in the transverse direction, the longitudinal direction, and the vertical direction at the same time, and preferably, the plurality of square reinforcement parts may be distributed on the bottom wall in a matrix.

Further, referring to fig. 1, 8 and 12, a lifting lug structure for hanging the battery pack on the vehicle body is provided outside the battery tray 2;

the shackle structure includes an upper support portion 213, a shoe 252, and a backing plate 253;

the upper support 213 is formed on an outer sidewall of the cavity 211;

one end of the bottom support 252 extends to the bottom of the panel 21, and the other end is formed with a lower support 2521;

the lining plate 253 is positioned between the upper support part 213 and the lower support part 2521, and is fixed to the upper support part 213 and the lower support part 2521, respectively; the lining plate 253 is used for enhancing the strength of the position of the battery pack and the vehicle body connecting bolt; this lug structure not only plays fine bearing to whole battery package, promotes anti-vibration ability.

Further, the shackle structure also includes a sleeve 254. The sleeve 254 may be disposed between the upper supporting portion 213 and the lining plate 253, and fixed to the upper supporting portion 213 and the lining plate 253, respectively (please refer to fig. 1, 8, and 12 together), or may be disposed through the upper supporting portion 213 and fixed to the upper supporting portion 213 and the lining plate 253, respectively (not shown).

The sleeve 254 and the lining plate 253 jointly reinforce the strength of the position of the battery pack and the vehicle body connecting bolt, so that the battery pack is firmly installed on a chassis of a vehicle body; this lug structure not only plays fine bearing to whole battery package, promotes anti-vibration ability, and structural rigidity is big moreover, and it is reasonable to pass power, has stronger anti extrusion performance.

When the sleeve 254 is inserted into the upper support part 213, the lower end of the sleeve 254 is preferably located between the upper support part 213 and the backing plate 253.

Preferably, the edges of the sleeve 254 are welded to the upper support 213 and the backing plate 253, respectively, to withstand a stronger pressing force from the vertical direction.

Further, referring to fig. 1, 8 and 12, the upper supporting portion 213 is shaped like a Chinese character 'ji', the lower supporting portion 2521 and the lining plate 253 are respectively shaped like an inverted Chinese character 'ji', and the upper supporting portion 213, the lining plate 253 and the lower supporting portion 2521 are sequentially attached and welded to bear stronger lateral pressing force.

Specifically, the lining plate 253 and the sleeve 254 are made of metal, preferably, the upper supporting portion 213, the lining plate 253 and the bottom support 252 are three layers of steel plates, and concentric circular holes are formed in the upper supporting portion 213, the lining plate 253 and the bottom support 252 and used for installing fastening bolts. The upper support portion 213 may be formed by punching a sidewall of the cavity 211.

Further, referring to fig. 1 to 5, the bus bar assembly 13 includes a bus bar support 131, a connecting bus bar 132 and a leading bus bar 133;

two bus bar supports 131 are respectively arranged on two transverse sides of the battery module 1, the battery cell 111 is positioned between the two bus bar supports 131, the two bus bar supports 131 are respectively provided with a connecting bus bar 132, and at least one bus bar support 131 is provided with a leading-out bus bar 133;

the positive pole E2 of one cell 111 and the negative pole E3 of another cell 111 in the two cells 111 distributed at the outermost side in the longitudinal direction are respectively connected with one lead-out busbar 133, the rest poles are connected with the connecting busbar 132, and each connecting busbar 132 is connected with more than two adjacent poles.

The bus bar bracket 131 plays a role of fixing the battery cells 111 and a role of providing mounting points for the connecting bus bar 132 and the leading-out bus bar 133, the length depends on the number of the battery cells 111 to be connected, the connecting pole of the connecting bus bar 132 and the leading-out bus bar 133 has a conductive function, the connecting bus bar 132 realizes the series and association of the battery cells 111, and the leading-out bus bar 133 is used for leading out the total positive pole and the total negative pole of the battery module 1; because the bus bar support 131 plays a role in fixing the battery cells 111 on the two sides of the battery module 1, side plates and end plates for fixing the battery module 1 can be omitted, the integration level is higher, and the weight and cost reduction and the space occupation reduction of the battery module 1 are facilitated; the number of the battery modules 1 of the battery pack is reduced when the battery pack is used, the consistency is improved, and the energy density of the battery pack is improved.

Preferably, the bus bar bracket 131 is a plastic bracket.

Further, referring to fig. 1 to fig. 3, each two battery cells 111 form a battery cell unit 11, and a spacer 12 for absorbing an expansion force of the battery cell 111 is spaced between any two adjacent battery cell units 11; the expansion force of the battery cell 111 is absorbed by the gasket 12 arranged between the adjacent battery cell units 11, so that the service life and the safety of the battery cell 111 are improved.

Of course, the gasket 12 for absorbing the expansion force of the battery cell 111 may be spaced between the longitudinally outermost cell unit 11 and the longitudinal side member 24.

Preferably, the gasket 12 is an aerogel gasket 12, which also serves to protect against fire, insulate against heat, and absorb the expansion forces of the cells 111.

Specifically, the adjacent sides of two cells 111 of the same cell unit 11, and the spacers 12 and the cells 111 on the two sides thereof may be bonded by a structural adhesive. The reliable connection between the electric cores 111 of the electric core units 11 and between the adjacent electric core units 11 is ensured, the structure of the battery module 1 is more compact, and the weight reduction is realized.

Further, referring to fig. 3 to 5 together, the positive poles E2 and the negative poles E3 are alternately disposed on each side of the battery module 1 in the lateral direction;

the two outgoing bus bars 133 are provided on one bus bar holder 131 or are provided separately on two bus bar holders 131. So, simplified the connection between the electric core 111, hookup busbar 132 plays the effect of establishing ties electric core 111, and the rethread is drawn out busbar 133 and is outwards exported after realizing all electric cores 111 to establish ties through a plurality of hookup busbars 132 of battery module 1 both sides.

Preferably, when an even number of cells 111 are provided, two outgoing busbars 133 are disposed on one busbar support 131, and when an odd number of cells 111 are provided, two outgoing busbars 133 are disposed on two busbar supports 131, which is beneficial to simplifying the conductive connection structure.

Further, referring to fig. 4 and fig. 5, a plurality of receiving grooves 1311 and a plurality of receiving holes 1312 are formed in the bus bar bracket 131, and the receiving grooves 1311 are located on a side of the bus bar bracket 131 away from the battery cells 111;

two accommodating grooves 1311 are respectively embedded with one lead-out bus bar 133, the groove wall of the accommodating groove 1311 for accommodating the lead-out bus bar 133 is provided with one accommodating hole 1312, the other accommodating grooves 1311 are respectively embedded with one connecting bus bar 132, and the groove wall of the accommodating groove 1311 for accommodating the connecting bus bar 132 is provided with two accommodating holes 1312;

the posts extend into the accommodating holes 1312 in a one-to-one correspondence manner, and are fixedly connected with the corresponding lead-out bus bars 133 or the connecting bus bars 132. The battery cell 111 and the bus bar bracket 131 are fixed, and the battery cell 111, the connecting bus bar 132 and the leading-out bus bar 133 are electrically connected; the receiving holes 1312 are spaced apart from each other to ensure that there is sufficient safety and creepage distance between the coupling busbars 132 and the lead-out busbars 133, thereby avoiding the risk of short circuits.

Preferably, the coupling bus bar 132 and the lead out bus bar 133 are fitted and welded with the respective poles.

Further, referring to fig. 4 to 6, the coupling bus bar 132 and the receiving groove 1311 for receiving the coupling bus bar 132 are convex;

the top of the connecting bus bar 132 is bent to form a collection end 1321 for connecting a data collector, and the collection end 1321 is located on the upper side of the battery module 1.

The monitoring connection structure is simplified, and the working state of the battery module 1 is conveniently monitored. Specifically, the data collector is used for collecting voltage, temperature and the like.

Preferably, referring to fig. 4 to 6, the coupling bus bar 132 and the receiving groove 1311 for receiving the coupling bus bar 132 are formed in a convex shape, so as to facilitate connection and positioning of the coupling bus bar 132 and the bus bar bracket 131.

Further, referring to fig. 5 and fig. 7, the accommodating groove 1311 for accommodating the lead-out bus bar 133 is rectangular, one end of the lead-out bus bar is limited to the rectangular positioning groove, and the other end of the lead-out bus bar extends out of the positioning groove and is bent toward the upper side of the battery module 1.

Preferably, referring to fig. 5 and 7, the end of the lead-out bus bar above the battery module 1 is L-shaped, so as to conveniently connect the total positive electrode and the total negative electrode of the whole battery module 1.

Further, referring to fig. 4 and fig. 5, a side of the bus bar support 131 away from the battery cell 111 is set to be a slope or a curved surface, so that the thickness of the bus bar support 131 is gradually reduced from bottom to top, thereby reducing weight.

Preferably, one side of the bus bar support 131 close to the battery cell 111 is vertically arranged, one side far away from the battery cell 111 is set as an inclined plane, and the inclined plane is gradually close to the battery cell 111 from bottom to top, so that the bus bar support 131 can stably limit the battery cell 111 and can reduce weight.

Further, referring to fig. 3 to 5, an explosion-proof pressure relief accommodating hole 1313 is formed in the bus bar bracket 131, the first explosion-proof pressure relief valve E1 corresponds to the explosion-proof pressure relief accommodating hole 1313 one by one, and the explosion-proof pressure relief accommodating hole 1313 communicates the first explosion-proof pressure relief valve E1 with the drainage hole 221. The structure is simplified, and the cell 111 spray is introduced into the protective beam 22 through the explosion-proof pressure relief accommodation hole 1313 on the bus bar bracket 131.

Further, referring to fig. 2, fig. 4 and fig. 5, the battery further includes a temperature-equalizing cover plate 14 disposed on the top of each battery cell 111, and preferably, the temperature-equalizing cover plate 14 is an aluminum cover plate; the temperature equalization cover plate 14 is arranged, so that each battery cell 111 is heated or cooled more uniformly, and further, the heating and cooling system arranged above the battery cells 111 can be matched for use to realize the temperature management of each battery cell 111.

Specifically, when the collection end 1321 is provided, the collection end 1321 is located above the temperature equalization cover plate 14, so that the connection of the data collector is facilitated.

Further, please refer to fig. 2 and fig. 3, further including an insulating heat conducting glue 15, the temperature-equalizing cover plate 14 is fixed to the top of each battery cell 111 through the insulating heat conducting glue 15, and the insulating heat conducting glue 15 can perform triple functions of heat conducting, insulating and connecting.

Further, referring to fig. 1 to 5, the battery pack further includes side insulating sheets 161 respectively disposed on sides of the two bus bar supports 131 facing away from each other, and the side insulating sheets 161 are used for separating the connecting bus bars 132 and the lead-out bus bars 133 from the side walls of the battery tray 2 of the battery pack to perform an insulating function.

When the bus bar bracket 131 is provided with the explosion-proof pressure relief accommodating hole 1313, it is preferable that the side surface insulation sheet 161 is provided with an escape accommodating hole 1611 facing the explosion-proof pressure relief accommodating hole 1313, so that the ejecta (such as an ejection medium or an open flame) from the battery cell 111 can be guided to the outside of the side surface insulation sheet 161.

Further, referring to fig. 1 to fig. 3, the battery pack further includes a bottom insulating sheet 162 disposed at the bottom of each of the battery cells 111, where the bottom insulating sheet 162 is used to separate the casing of the battery cell 111 from the inner bottom of the battery tray 2 of the battery pack, and functions to connect the bottoms of the battery cells 111 and insulate the battery cells 111 from the inner bottom of the tray.

Further, referring to fig. 1 to fig. 3, the battery pack further includes a heat insulating layer 17 disposed at the bottom of the bottom insulating sheet 162, and the heat insulating layer 17 can prevent the temperature inside the battery pack from changing too much, so that the battery cell 111 is always at a proper working temperature. The insulating layer 17 may be specifically insulating cotton.

Further, referring to fig. 1 to fig. 3, the terminal surface insulating sheet 163 is further included on two outer sides of the plurality of cells 111 along the longitudinal direction, and when the gasket 12 is disposed on the outer side of the outermost cell 111, the terminal surface insulating sheet 163 is connected to the gasket 12 adjacent thereto (i.e., the gasket 12 adjacent to the terminal surface insulating sheet 163 on the outermost side among all the gaskets 12), so as to insulate the cell 111 from the side wall of the tray along the longitudinal direction.

Specifically, between side insulating sheet 161 and busbar support 131, electric core 111 and bottom insulating sheet 162, between bottom insulating sheet 162 and heat preservation 17 and between terminal surface insulating sheet 163 and its adjacent electric core 111 or gasket 12, the accessible structure glues and bonds, guarantees reliable connection, and battery module 1's structure is more compact, realizes subtracting the weight, has reduced welding and bolt structure to simplify production technology and reduction in production cost.

The invention also provides a vehicle which comprises the battery pack.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Battery package, including battery tray and battery module, its characterized in that: the battery tray comprises a panel and a hollow protection beam extending along the longitudinal direction;

the panel is sunken downwards to form a cavity;

the battery module is arranged in the cavity and comprises a plurality of battery cores which are arranged longitudinally and a confluence assembly which is in conductive connection with all the battery cores, and a first explosion-proof pressure release valve is arranged on the transverse outer side of each battery core;

the protection beam is arranged in the cavity, is positioned between the transverse outer side of the battery module and the transverse inner side wall of the cavity, and is connected with the bottom wall and the transverse inner side wall of the cavity;

and the protection beam is provided with drainage holes which are in one-to-one correspondence with the first explosion-proof pressure relief valves, and the drainage holes are used for guiding the jet of the first explosion-proof pressure relief valves into the protection beam.

2. The battery pack according to claim 1, wherein: the positive pole and the negative pole of each battery cell are respectively arranged at two transverse sides of the battery cell, and the two protective beams are distributed at two transverse sides of the panel;

3. The battery pack according to claim 2, wherein: the first explosion-proof pressure relief valve is arranged below the pole.

4. The battery pack according to claim 1, wherein: the panel and the protection beam are provided with discharge through holes corresponding to the second explosion-proof pressure release valves;

the two ends of the protection beam are closed.

5. The battery pack according to claim 1, wherein: the orientation of protection roof beam one side of battery module with the laminating of battery module deviates from one side of battery module with the inside wall laminating of cavity.

6. The battery pack according to claim 1, wherein: the top side of the protection beam is gradually inclined downward in a direction away from the battery module.

7. The battery pack according to claim 1, wherein: the battery tray also comprises hollow longitudinal side beams;

the battery module is characterized in that longitudinal side beams extending transversely are fixed on two longitudinal sides of the cavity, the longitudinal side beams are connected with the bottom wall and the longitudinal inner side wall of the cavity, and the battery modules are located between the longitudinal side beams.

8. The battery pack according to claim 7, wherein: one side of the longitudinal side beam, facing the battery module, is attached to the battery module, and the other side of the longitudinal side beam, facing away from the battery module, is attached to the inner side wall of the cavity; one side of the longitudinal side beam, which is close to the battery module, is higher than one side of the longitudinal side beam, which is far away from the battery module.

9. The battery pack according to claim 8, wherein: and a bulge used for heightening the longitudinal side beam is arranged on one side, close to the battery module, of the top side of the longitudinal side beam, or the top side of the longitudinal side beam is provided with an inclined plane.

10. The battery pack according to claim 1, wherein: the bottom wall of the cavity is sunken to form a plurality of panel reinforcing parts which are arranged downwards in a protruding mode.

11. The battery pack according to claim 1, wherein: a lifting lug structure for lifting the battery pack on the vehicle body is arranged outside the battery tray;

the upper supporting part is formed on the outer side wall of the cavity;

12. The battery pack according to claim 11, wherein: go up the supporting part and be several fonts, the lower carriage with the welt is the font of falling several fonts respectively, just go up the supporting part the welt with the lower carriage laminates in proper order and welds.

13. The battery pack according to claim 2, wherein: the bus assembly comprises a bus bar bracket, a connecting bus bar and a leading-out bus bar;

14. The battery pack of claim 13, wherein: the positive pole posts and the negative pole posts are alternately arranged on each side of the battery module along the transverse direction;

15. The battery pack of claim 14, wherein: the bus bar support is provided with a plurality of accommodating grooves distributed along the longitudinal direction and a plurality of accommodating holes distributed along the longitudinal direction, and the accommodating grooves are positioned on one side of the bus bar support, which is far away from the battery core;

16. The battery pack of claim 15, wherein: the connecting bus bar and the accommodating groove for accommodating the connecting bus bar are in a convex shape;

17. The battery pack of claim 13, wherein: be equipped with explosion-proof pressure release accommodation hole on the busbar support, first explosion-proof relief valve with explosion-proof pressure release accommodation hole one-to-one, explosion-proof pressure release accommodation hole intercommunication first explosion-proof relief valve with the drainage hole.

18. The battery pack of claim 13, wherein: the insulating plate also comprises a side surface insulating plate, a bottom insulating plate, a heat-insulating layer and an end surface insulating plate;

19. A vehicle, characterized in that: comprising a battery pack according to any of claims 1-18.