CN220914427U - Battery module and battery pack - Google Patents

Abstract

The utility model belongs to the battery technology, and discloses a battery module and a battery pack, wherein the battery module comprises a box body and a battery cell stacking body in the box body; the box body at least comprises a group of side plates, and the side plates are arranged at two sides of the cell stacking body; an exhaust channel is arranged in the side plate, and an exhaust hole is arranged in the exhaust channel corresponding to the battery cell stacking body. When the electric core takes place thermal runaway, the spark of eruption can be isolated by the curb plate of box, and the exhaust hole that sets up on the curb plate can play the guide effect to the high temperature gas that produces when electric core thermal runaway, and the high temperature gas that thermal runaway produced is guided to exhaust passage by the exhaust hole and is discharged from the both ends of curb plate to avoid adjacent electric core stack to receive the influence, effectively prevent the flame cluster that the battery thermal runaway caused and burn, avoid producing the potential safety hazard behind the battery thermal runaway.

Description

Battery module and battery pack

Technical Field

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

Background

With the vigorous development of new energy industry, energy density, fast charging efficiency, safety performance and the like of a battery system have become important research subjects of battery factories.

In the prior art, the battery system thermal safety protection generally has two measures of actively inhibiting thermal runaway and passively inhibiting thermal runaway, wherein the actively inhibiting thermal runaway generally realizes the effects of increasing heat emission and improving heat exchange efficiency by heat conduction through the adjustment of a thermal management system; passive suppression of heat spreading is generally achieved in two ways: firstly, a firewall is arranged around a weak point of the electric core explosion, and once the electric core is out of control, the fire is blocked by the firewall to prevent the electric core from being directly sprayed to an adjacent electric core to cause heat spreading; secondly, make the soft packet of electric core module, set up explosion-proof valve or set up the pressure release mouth on the position of the relative safe direction of eruption of casing on the module casing, form the effect that directional eruption was realized, reduce the probability of heat spreading.

In the fireproof mode of the soft-pack battery system, the hole of the existing liquid cooling plate is a through hole, for example, the utility model patent with publication number CN 217933979U discloses an exhaust type liquid cooling plate, which comprises a liquid cooling plate body, wherein the liquid cooling plate body comprises two surfaces which are oppositely arranged, the liquid cooling plate body is provided with an exhaust hole, and the exhaust hole penetrates through the two surfaces of the liquid cooling plate body; the liquid cooling plate body is internally provided with a runner, and the exhaust hole penetrates through a runner gap of the liquid cooling plate body. The exhaust hole is arranged on the liquid cooling plate body, when the battery cell is in thermal runaway, the exhaust hole of the liquid cooling plate body can be used for exhausting, so that the time of open flame of the thermal runaway of the battery cell is prolonged, the liquid cooling plate body has a liquid cooling heat dissipation function and also has a gas exhausting and pressure releasing function, and the electric energy storage battery cell can be effectively dredged and directionally erupted. However, the stacks among the cell stacks are easy to spray to the adjacent cell stacks through the exhaust holes on the liquid cooling plate to generate heat spreading, so that the side-by-side cell stacks are affected to generate heat spreading.

Disclosure of utility model

The utility model mainly aims to provide a battery module, which aims to solve the technical problem that heat spreading is easy to occur between side-by-side battery cell stacks in the prior art.

In order to achieve the above object, a first aspect of the present utility model provides a battery module, including a case and a cell stack in the case; the box body at least comprises a group of side plates, and the side plates are arranged at two sides of the cell stacking body; an exhaust channel is arranged in the side plate, and an exhaust hole is arranged in the exhaust channel corresponding to the battery cell stacking body.

Further, the side plate comprises an inner side plate and an outer side plate, the exhaust channel is arranged between the inner side plate and the outer side plate, and the exhaust hole is formed in the inner side plate.

Further, a liquid cooling channel and a liquid cooling through port are arranged in the side plate, and the liquid cooling through port is a water inlet and a water outlet of the liquid cooling channel.

Further, the liquid cooling channel at least comprises a first baffle, a second baffle and a third baffle, wherein the second baffle is arranged between the first baffle and the third baffle, and a flow passage is reserved at one end of the second baffle.

Further, the water inlet is arranged at one end, which is far away from the overflow channel, between the first partition plate and the second partition plate; the water outlet is arranged at one end, far away from the overflow channel, between the second partition plate and the third partition plate.

Further, the battery cell stack body at least comprises a first battery cell stack body and a second battery cell stack body, and the connection part between the tab of the first battery cell stack body and the tab of the second battery cell stack body is filled with the flame-retardant heat-insulating glue _.

Further, each adjacent battery cell tab of the first battery cell stack body, which needs to be connected with each other, is directly welded; and/or, each adjacent battery cell tab of the second battery cell stack body, which is required to be connected with each other, is directly welded.

Further, the filling mode of the flame-retardant heat-insulating glue is glue injection or glue coating.

Further, the heat-conducting glue is ceramic heat-insulating structural glue.

Another aspect of the present utility model provides a battery pack, including the battery module according to any one of the above embodiments.

The beneficial effects are that:

The battery module comprises a box body and a battery cell stacking body in the box body; the box body at least comprises a group of side plates, and the side plates are arranged at two sides of the cell stacking body; an exhaust channel is arranged in the side plate, and an exhaust hole is arranged in the exhaust channel corresponding to the battery cell stacking body. When the electric core takes place thermal runaway, the spark of eruption can be isolated by the curb plate of box, and the exhaust hole that sets up on the curb plate can play the guide effect to the high temperature gas that produces when electric core thermal runaway, and the high temperature gas that thermal runaway produced is guided to exhaust passage by the exhaust hole and is discharged from the both ends of curb plate to avoid side by side electric core stack body to receive the influence, effectively prevent the flame cluster that the battery thermal runaway caused and burn, avoid producing the potential safety hazard behind the battery thermal runaway.

Drawings

FIG. 1 is an exploded view of one embodiment of the present utility model;

FIG. 2 is a schematic diagram of a liquid cooling plate according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a liquid cooling plate according to an embodiment of the utility model;

Fig. 4 is a perspective view of a battery module according to the present utility model, which is not filled with a flame retardant and heat insulating adhesive;

fig. 5 is a perspective view of a battery module filled with a flame retardant and heat insulating adhesive according to the present utility model;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a schematic cross-sectional view of the A-A plane of FIG. 6.

Wherein:

1. A side plate; 101. an inner side plate; 102. an outer panel; 103. an exhaust hole; 104. an exhaust passage; 105. a liquid cooling channel; 106. a water inlet; 107. a water outlet; 201. a first separator; 202. a second separator; 203. a third separator; 301. a first cell stack; 302. a second cell stack; 4. flame-retardant heat-insulating glue; 5. and a tab.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element 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 utility model. 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 utility model, the meaning of "a plurality" is two or more, unless specifically defined otherwise.

In the description of the present utility model, 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 above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, 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, as well as the first and second features not being in direct contact but being in contact with each other through 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 under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Referring to fig. 1, an embodiment of the present utility model provides a battery module including a case and a cell stack in the case; the box body at least comprises a group of side plates 1, and the side plates 1 are arranged at two sides of the cell stack body; an exhaust channel 104 is arranged in the side plate 1, and the exhaust channel 104 is provided with an exhaust hole 103 corresponding to the cell stack body. The curb plate 1 can be the board of one deck recess that has, the shape of recess is exhaust passage 104, when the electric core takes place thermal runaway, the spark of eruption can be isolated by the curb plate 1 of box, the exhaust hole 103 that sets up on the curb plate 1 can play the guide effect to the high temperature gas that produces when thermal runaway, the high temperature gas that thermal runaway produced is guided to exhaust passage 104 by exhaust hole 103 and is discharged from the both ends of curb plate 1, in order to avoid side by side electric core stack to receive the influence, effectively prevent the flame cluster that the battery thermal runaway caused burns, avoid producing the potential safety hazard behind the battery thermal runaway.

Optionally, the side plate 1 includes an inner side plate 101 and an outer side plate 102, the exhaust channel 104 is disposed between the inner side plate 101 and the outer side plate 102, and the exhaust hole 103 is disposed on the inner side plate 101. As shown in fig. 2, the side plate 1 is formed by adding an outer side plate 102 on the outer side of an inner side plate 101 with a groove, the exhaust channel 104 is a cavity formed by the inner side plate 101 and the outer side plate 102 together, and high-temperature gas generated by the out-of-control cell and electrolyte inside the cell can be emitted towards two ends along the cavity.

Optionally, a liquid cooling channel 105 and a liquid cooling port are arranged in the side plate 1, and the liquid cooling port is a water inlet 106 and a water outlet 107 of the liquid cooling channel 105. The heat generated by the operation of the battery cells in the battery cell stack body is in contact or indirect contact with the surface of the side plate 1, and most of the heat can be taken away by the cooling liquid flowing in the liquid cooling channel 105 in the liquid cooling plate, so that the purpose of heat conduction is achieved.

As shown in fig. 3, in the above embodiment, the liquid cooling channel 105 includes at least a first partition 201, a second partition 202, and a third partition 203, the second partition 202 is disposed between the first partition 201 and the third partition 203, and a flow channel is left at one end of the second partition 202. The liquid cooling channels 105 are separated by the partition plates to prolong the cooling circuit, the number of the partition plates can be adjusted according to the width of the side plates, and more partition plates can be arranged according to the liquid cooling and exhaust requirements under the conditions of larger size and wider width of the cold plates.

In the above embodiment, the water inlet 106 is provided at an end between the first partition 201 and the second partition 202 away from the flow passage; the water outlet 107 is provided at an end of the second diaphragm 202 and the third diaphragm 203 away from the flow passage. The arrangement makes the water inlet 106 and the water outlet 107 farther apart, the loop of the whole liquid cooling channel 105 is longer, the cooling effect is better, the position of the water inlet and the water outlet can be adjusted at will, and the water inlet and the water outlet can be arranged at any position of the side plate according to design requirements.

Referring to fig. 4-7, in another embodiment, the battery module further includes a flame retardant and heat insulating glue 4, the cell stack includes at least a first cell stack 301 and a second cell stack 302, and the connection between the tab 5 of the first cell stack 301 and the tab 5 of the second cell stack 302 is filled with the flame retardant and heat insulating glue 4. Because the tab 5 is a weak point of electric core eruption, when electric core takes place thermal runaway, because fire-retardant heat-insulating glue 4 shutoff the clearance around the tab 5, fire-retardant heat-insulating glue 4 around the tab 5 has the function of thermal insulation, can keep apart the flame that thermal runaway produced, indirectly form the firewall, make the spark that an electric core produced can not splash adjacent or opposite electric core, avoid nearby electric core stack to receive the influence, the heat conduction between the electric core has been reduced, the effect of preventing the heat spread has been played, after the tab 5 of electric core utilizes welding frock to realize the tab 5 welding simultaneously, owing to there is fire-retardant heat-insulating glue 4 to fill in the middle of the tab 5, fire-retardant heat-insulating glue 4 solidifies into solid-state and can play the locate action to tab 5 after the overlap joint, this kind of structural design is simple, can save parts such as busbar and PLASTIC board, realize simplifying the function of structure, release PLASTIC board and busbar occupied space, improve the energy density of battery module, the cost is reduced, promote battery security performance.

In the above embodiment, the case may further include three battery cell stacks, where the three battery cell stacks are disposed opposite to each other through the tab 5 ends, and are arranged in the case in succession, and the connection portion of the tab 5 between each battery cell stack is filled with the flame-retardant heat-insulating glue 4; when there are four electric core stacks in the box, the electric core stacks that two utmost point ear 5 ends set up relatively become a pair of, and the utmost point ear 5 between a pair of electric core stacks is packed by fire-retardant heat-insulating glue 4 parcel and is filled, separates through curb plate 1 between two pairs of electric core stacks to take place the heat after thermal runaway and spread, reduce the risk.

Optionally, each adjacent battery cell tab 5 of the first battery cell stack 301, which needs to be connected to each other, is directly welded; and/or, each adjacent and mutually connected battery cell tab 5 of the second battery cell stack 302 is directly welded. The welding of the tab 5 between the adjacent cells to be connected in the first cell stack 301 and the welding of the tab 5 between the adjacent cells to be connected in the second cell stack 302 may be performed, and the welding place between the tab 5 and the tab 5 in the single cell stack is filled with the flame-retardant and heat-insulating glue 4.

Optionally, the filling mode of the flame-retardant and heat-insulating glue 4 is glue injection or glue coating. After the electric core stacks are well, the flame-retardant heat-insulating glue 4 is injected between the electric core stacks in a manual, mechanical, pneumatic and other pressing modes, because the flame-retardant heat-insulating glue 4 is fluid at normal temperature, the flame-retardant heat-insulating glue 4 can be injected at one time, gaps between the first electric core stacks 301 and the second electric core stacks 302 can be fully filled with the flame-retardant heat-insulating glue 4, the lug 5, which is close to one side of the end plate, in the electric core stacks close to the end plate is filled with the flame-retardant heat-insulating glue 4, which is close to the lug 5, is integrated after drying and curing, can indirectly fix the lug 5 and the lug 5 together, reduce the risk of fracture and shedding between the lug 5 and the lug 5, and improve the safety performance. The glue coating is to spot-coat the flame-retardant heat-insulating glue 4 on the electrode lug 5 when stacking the battery cells layer by layer, wherein, the electrode lug 5 of the battery cell of one layer is spot-coated by stacking the battery cell, so that the electrode lug 5 is fully wrapped by the flame-retardant heat-insulating glue 4 and then starts to stack the battery cell of a new layer.

Optionally, the flame-retardant heat-insulating adhesive 4 can be ceramic heat-insulating structural adhesive, the matrix is modified softened epoxy resin, the ceramic heat-insulating structural adhesive has high bonding strength and excellent insulating property, and has high ceramic forming speed, and a ceramic product formed after the ceramic heat-insulating adhesive meets high-temperature ignition has certain strength and can bear certain impact force, so that the ceramic heat-insulating adhesive can withstand and block flames at 1200 ℃ and can play a role in isolating flames in a thermal runaway environment; the silicone rubber flame retardant can be selected, a barrier layer is formed on the combustion surface of the silicone rubber, heat energy is prevented from being transmitted to the depth of the silicone rubber, the temperature rise is inhibited to achieve the aim of flame retardance, and the silicone rubber flame retardant is more environment-friendly when combusted and does not generate toxic gas and smoke; and a latex-based elastic sealant can be selected, and can be solidified after dripping out, so that an integrated flexible fireproof sealing effect is formed.

Another embodiment of the present utility model provides a battery pack, including the battery module according to any one of the above embodiments.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes using the descriptions and drawings of the present utility model or directly or indirectly applied to other related technical fields are included in the scope of the utility model.

Claims (10)

1. A battery module, which is characterized by comprising a box body and a battery cell stacking body in the box body;

The box body at least comprises a group of side plates, and the side plates are arranged at two sides of the cell stacking body; an exhaust channel is arranged in the side plate, and an exhaust hole is arranged in the exhaust channel corresponding to the battery cell stacking body.

2. The battery module according to claim 1, wherein the side plate includes an inner side plate and an outer side plate, the exhaust passage is provided between the inner side plate and the outer side plate, and the exhaust hole is provided on the inner side plate.

3. The battery module according to claim 1, wherein a liquid cooling channel and a liquid cooling through hole are arranged in the side plate, and the liquid cooling through hole is a water inlet and a water outlet of the liquid cooling channel.

4. The battery module according to claim 3, wherein the liquid cooling passage includes at least a first separator, a second separator, and a third separator, the second separator being disposed between the first separator and the third separator, and a flow passage being left at one end of the second separator.

5. The battery module according to claim 4, wherein the water inlet is provided at an end between the first separator and the second separator, which is away from the flow passage; the water outlet is arranged at one end, far away from the overflow channel, between the second partition plate and the third partition plate.

6. The battery module of claim 1, further comprising a flame retardant and heat insulating glue, wherein the cell stack comprises at least a first cell stack and a second cell stack, and wherein the flame retardant and heat insulating glue is filled at a connection between a tab of the first cell stack and a tab of the second cell stack _.

7. The battery module of claim 6, wherein each adjacent and interconnected cell tab of the first cell stack is directly welded; and/or, each adjacent battery cell tab of the second battery cell stack body, which is needed to be connected with each other, is directly welded.

8. The battery module of claim 6, wherein the flame-retardant and heat-insulating glue is filled by glue injection or glue spreading.

9. The battery module of claim 6, wherein the flame retardant and heat insulating glue is a ceramic heat insulating structural glue.

10. A battery pack comprising the battery module according to any one of claims 1 to 9.