Double-layer square shell liquid cooling module structure

Abstract

The utility model provides a double-layer square shell liquid cooling module structure, which comprises a cooling frame, wherein the cooling frame is of an H-shaped structure consisting of a bottom plate and two side plates; the heat-conducting structural adhesive is adhered to the upper surface and the lower surface of the bottom plate; the upper battery core pile is stacked on the upper side of the bottom plate; the lower battery core pile is stacked on the lower side of the bottom plate, and the back surfaces of the pole columns on the upper battery core pile and the lower battery core pile are arranged outwards; the H-shaped cooling frame is adopted, the cell stacks are arranged on two sides of the H-shaped cooling frame in a CTP structural form, the middle of the H-shaped cooling frame is provided with the cold plate, the middle cold plate cools the cell stacks on two sides at the same time, use of a layer of cold plate is reduced, the weight of structural parts is reduced, Z-direction available extreme space of the cells is increased, electric quantity is increased, and mileage is increased. The temperature and temperature difference consistency of the upper-layer and lower-layer cells is high, flow distribution is relatively simple, and the temperature control difficulty coefficient of the cells is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium ion battery PACK technical field especially relates to a double -deck square shell liquid cooling module structure. BACKGROUND

[0002] The most important and costliest part of new energy automobile is the battery part, which is also the part most prone to safety accidents. In the practical application of power battery, one or more single cells are usually combined into a battery module through series / parallel connection, and the battery module is used for overall output, therefore, the design of the battery module is very important.

[0003] In the field of commercial vehicles, the battery is pursued to have long endurance mileage and long service life, and the battery also needs to meet the functions of fast charging and fast discharging. The installation space of the battery of the commercial vehicle is more sufficient than the Z-direction space of the passenger vehicle, and the Z-direction space of the battery pack of the commercial vehicle is about 250mm. If a multi-pack stacking arrangement is adopted, the following problems exist:

[0004] 1. The Z-direction height of the cell is too high, which is not conducive to the temperature control of the battery in the high-rate charging and discharging process, and the service life of the cell is easily reduced due to the excessive temperature difference. The battery use process is also prone to false alarm caused by distorted temperature acquisition. It is necessary to reduce the Z-direction height of the cell to reduce the cooling path;

[0005] 2. The upper and lower double-layer square shell cells are arranged, and the double-layer cold plate cooling form is used. The flow of the refrigerant (in the form of liquid cooling or direct cooling) is prone to uneven distribution, and the temperature control of the upper and lower cells is difficult.

[0006] 3. The upper and lower double-layer square shell cells and the double-layer cold plate arrangement cause the compression of the Z-direction cell utilization space due to the insulation space, which reduces the configuration of the electric quantity and the driving mileage, and also increases the weight;

[0007] 4. The positive poles of the upper and lower double-layer square shell cells are arranged upward, and the electrolyte injection direction is consistent when thermal runaway occurs, which increases the probability of thermal runaway failure.

[0008] Therefore, we propose a double-layer square shell liquid cooling module structure to solve the problem of multi-pack stacking arrangement. UTILITY MODEL CONTENTS

[0009] The utility model aims at solving the shortcomings in the prior art, and in order to achieve the above object, the utility model adopts the following technical scheme:

[0010] A double-layer square shell liquid cooling module structure, comprising: a cooling frame, the cooling frame is composed of a bottom plate and two side plates into an H-shaped structure; a heat-conducting structural adhesive is arranged on the upper and lower surfaces of the bottom plate; an upper cell stack is stacked on the upper side of the bottom plate; a lower cell stack is stacked on the lower side of the bottom plate, and the pole columns on the upper cell stack and the lower cell stack are both outwardly arranged; and a cover plate covers the outer sides of the upper cell stack and the lower cell stack.

[0011] Further preferably, the cooling frame is an integrally formed structure.

[0012] Further preferably, the bottom plate inner cavity is provided with a front-to-back through cavity, a plurality of partition strips are arranged at intervals in the cavity, the plurality of partition strips separate the cavity into a continuous flow channel, the front and rear ends of the cavity are sealed by plugs, a connecting port communicating with the flow channel is formed in the side plate, and a water nozzle is mounted on the connecting port.

[0013] Further preferably, the upper cell stack comprises: a plurality of cells arranged side by side; a heat insulation material arranged between adjacent cells; a plastic end plate arranged on the outer side of the plurality of cells; and an adapter seat mounted on the outer side wall of the plastic end plate.

[0014] Further preferably, a protective cover is mounted on the adapter seat.

[0015] Further preferably, the connecting port is two, and the two connecting ports are arranged on the same side or different sides of the side plate.

[0016] Further preferably, the water nozzle is two, one connected to an inlet pipe and the other connected to an outlet pipe.

[0017] Further preferably, the structure of the lower cell stack is consistent with that of the upper cell stack.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] The present application adopts an H-shaped cooling frame form, and the cell stack body is arranged on both sides of the H-shaped cooling frame in a CTP structural form, the middle of the H-shaped cooling frame is a cold plate, the middle cold plate simultaneously cools the two side cell stack bodies, reduces the use of one layer of cold plate, reduces the weight of structural parts, reduces the cost, increases the Z-direction available space of the cell, increases the electric quantity, improves the mileage, the temperature and temperature difference consistency of the upper and lower layer cells are high, the flow distribution is relatively simple, the temperature control difficulty coefficient of the cell is reduced, the pole column is opposite, when thermal runaway occurs, the electrolyte injection direction is opposite, the probability of thermal runaway failure is reduced, and the controllable safety coefficient of the cell thermal runaway is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is an exploded view of the present application;

[0021] Figure 2 is an assembly view of the present application;

[0022] Figure 3 is an exploded view of the cooling frame in the present application;

[0023] Figure 4 is a structural view of the cooling frame in the present application;

[0024] Figure 5 is a structural view of the cell stack in the present application.

[0025] In the figure: cooling frame 1, heat-conducting structural glue 2, upper cell stack 3, cover plate 4, lower cell stack 5, protective cover 6, bottom plate 11, side plate 12, partition strip 13, flow channel 14, plug 15, connecting port 16, water nozzle 17, cell 31, heat-insulating material 32, plastic end plate 33, adapter seat 34. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0027] With reference to Figures 1-5 A double-layer square shell liquid cooling module structure, comprising: a cooling frame 1, the cooling frame 1 is composed of a bottom plate 11 and two side plates 12 into an H-shaped structure; heat-conducting structural glue 2, the heat-conducting structural glue 2 is adhered to the upper and lower surfaces of the bottom plate 11; an upper cell stack 3, the upper cell stack 3 is stacked on the upper side of the bottom plate 11; a lower cell stack 5, the lower cell stack 5 is stacked on the lower side of the bottom plate 11, the pole columns on the upper cell stack 3 and the lower cell stack 5 are both outwardly arranged; a cover plate 4, the cover plate 4 covers the outer side of the upper cell stack 3 and the lower cell stack 5, and the cooling frame is an integrally extruded structure.

[0028] In the embodiment, the cooling frame 1 is in the form of an H-shaped cooling frame, the cell stack is arranged in the form of a CTP structure on both sides of the H-shaped cooling frame, the square shell cell poles face opposite directions, the middle of the H-shaped cooling frame is a cold plate, and the middle cold plate cools the cell stacks on both sides. The use of one layer of cold plate is reduced, the Z-direction available space of the cell is increased, the electric quantity is increased, the mileage is improved, the weight of the structural member is reduced, the cost is reduced, the flow distribution is relatively simple, the temperature and temperature difference consistency of the upper and lower cells is high, the temperature control difficulty coefficient of the cell is reduced, the service life of the cell is improved, the weight of the structural member is reduced, the available space of the cell is increased, the electric quantity is increased, the mileage is improved, and the controllable safety coefficient of the cell in the case of thermal runaway is improved.

[0029] The bottom plate 11 is provided with a cavity penetrating from front to back, a plurality of partition strips 13 are arranged at intervals in the cavity, the plurality of partition strips 13 divide the cavity into one continuous flow channel 14, the front and back ends of the cavity are sealed by plugs 15, the side plate 12 is provided with connecting openings 16 communicating with the flow channel 14, water nozzles 17 are installed on the connecting openings 16, the connecting openings 16 are two, and the two connecting openings 16 are arranged on the same side or different sides of the side plate 12; the water nozzles 17 are two, one is connected to an inlet pipe, and the other is connected to an outlet pipe.

[0030] In the embodiment, the cooling liquid enters from one side of the water nozzle 17, then flows through the flow channel 14, and then flows out from the other side of the water nozzle 17, so as to reduce the temperature of the cell stacks on both sides, the flow distribution is relatively simple, and the temperature control difficulty coefficient of the cell is reduced.

[0031] The upper cell stack 3 comprises: cells 31, a plurality of the cells 31 are arranged side by side; thermal insulation materials 32 are arranged between adjacent cells 31; plastic end plates 33 are arranged on the outer sides of the plurality of cells 31; adapter seats 34 are installed on the outer walls of the plastic end plates 33, protective covers 6 are installed on the adapter seats 34, and the structure of the lower cell stack 5 is consistent with that of the upper cell stack 3.

[0032] In the embodiment, the square shell cells form the upper cell stack 3 and the lower cell stack 5, and a thermal insulation and buffering material (such as silicon foam, PU cotton + aerogel, CR cotton + aerogel, etc.) is arranged between the cells 31; plastic end plates are arranged on both sides of the stack as a clamping structural member in the cell stacking process; the plastic end plate is provided with an adapter seat, the adapter seat can be integrally injection molded with the plastic end plate, or can be separately injection molded and formed into a structural docking member with the plastic end plate; a thermal insulation material (aerogel, mica plate, etc.) is arranged between the plastic end plate and the cells on both sides;

[0033] The H-shaped cooling frame 1 body is integrally stretched and formed; bolt connection is reduced, the overall rigidity of the module is improved, and the strength of the battery pack is improved; the middle flat plate is stretched out of the cooling flow channel, the both sides are sealed by flow channel plugs by friction stir welding and CMT welding; meanwhile, the water nozzle is installed, welded and fixed through single-side or same-side opening, and the coolant (liquid cooling or direct cooling) is in and out through the water nozzle;

[0034] The square shell cell stack is loaded into the H-shaped cooling frame by clamping and compression, and the upper and lower shell cell poles are opposite (as shown in the Figure 1 The stack is tightly attached to the inner surface of the cooling frame by the initial pre-tightening force of clamping and the adhesion of the heat-conducting structural adhesive; the series connection between the square shell cells and the voltage and temperature collection adopt the CCS form, the CCS is welded on the pole surface by the connecting row, and the positive and negative poles of the module are externally connected to the connecting row and are insulated and protected by the protection cover.

[0035] The utility model adopts the H-shaped cooling frame form, the cell stack adopts the CTP structure form and is arranged on the both sides of the H-shaped cooling frame, the middle of the H-shaped cooling frame is the cold plate, the middle cold plate cools the both sides cell stack simultaneously, reduces the use of a layer of cold plate, reduces the weight of structural member, reduces the cost, increases the Z direction available space of cell simultaneously, increases the electric quantity, improves the mileage, the temperature and temperature difference consistency of upper and lower layer cell is high, the flow distribution is relatively simple, reduces the temperature control difficulty coefficient of cell, the pole direction is opposite, when the thermal runaway occurs, the electrolyte injection direction is opposite, reduces the probability of thermal runaway failure, improves the controllable safety coefficient of cell thermal runaway.

Claims

1. A double-layered square shell liquid cooling module structure, characterized in that, The application relates to a cooling frame for a battery pack, which comprises the following parts: a cooling frame in H-shaped structure, which is composed of one bottom plate and two side plates; a heat-conducting structural adhesive, which is adhered to the upper and lower surfaces of the bottom plate; an upper battery cell stack, which is stacked on the upper side of the bottom plate; a lower battery cell stack, which is stacked on the lower side of the bottom plate, and the pole columns on the upper battery cell stack and the lower battery cell stack are arranged to face away from each other; a cover plate, which covers the outer sides of the upper battery cell stack and the lower battery cell stack.

2. The double-layered square-shell liquid cooling module structure according to claim 1, wherein, The bottom plate is provided with a cavity which penetrates from front to back, and a plurality of partition strips are arranged at intervals in the cavity, so that the cavity is divided into one continuous flow channel; the front and back ends of the cavity are sealed by plugs; the side plates are provided with connecting ports which are connected with the flow channel, and the connecting ports are provided with water nozzles. The upper battery cell stack comprises:

3. The double-layered square-shell liquid cooling module structure according to claim 1, wherein, a plurality of battery cells which are arranged side by side; heat insulation materials which are arranged between the adjacent battery cells; plastic end plates which are arranged on the outer sides of the battery cells; and an adapter seat which is arranged on the outer side wall of the plastic end plate. The adapter seat is provided with a protective cover.

4. The double-layered square-shell liquid cooling module structure according to claim 3, characterized in that, The connecting ports are two, and the two connecting ports are arranged on the same side or different sides of the side plates.

5. The double-layered square-shell liquid cooling module structure according to claim 2, wherein, The water nozzles are two, and the two water nozzles are connected with the liquid inlet pipe and the liquid outlet pipe respectively.

6. The double-layered square-shell liquid cooling module structure according to claim 2, wherein, The structure of the lower battery cell stack is consistent with that of the upper battery cell stack.

7. The double-layered square-shell liquid cooling module structure according to claim 3, wherein, The cooling frame is an integrally formed structure.

8. The double-layered square-shell liquid cooling module structure according to claim 1, wherein, ​

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