Heat conduction and thermal form change self-adaptive soft package power battery

Abstract

The invention discloses a heat conduction and thermal form change self-adaptive soft package power battery which comprises a soft core battery module, a heat conduction outer enclosure and a self-adaptive inner filling body, the heat-conducting outer enclosure comprises a module shell, a heat-conducting plate body and heat-conducting glue; the module shell and the soft core battery module are limited to form an inner layer gap; the battery shell surrounds the heat-conducting plate body and is limited with the module shell to form an outer-layer gap; the heat-conducting glue is poured into the outer-layer gap and flows into the inner-layer gap through the hollow-structure-shaped module shell, and the heat-conducting glue is cured and serves as a heat-conducting medium to connect the soft-core battery module, the module shell, the heat-conducting plate body and the battery shell into a whole capable of sequentially conducting heat from inside to outside; and the elastic self-adaptive inner filling body is elastically clamped and filled in an expansion gap reserved between the connected soft package battery cells which are assembled in a stacked manner. The heat dissipation efficiency of the battery is improved through heat conduction, the battery is protected against thermal form volume change through elastic self-adaptive filling, and the safety of the battery is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of soft-pack power batteries, and in particular relates to a soft-pack power battery with adaptive thermal conductivity and thermal morphology. Background Art

[0002] The battery will generate heat during the charging and discharging process. If the heat cannot be dissipated in time, the battery temperature will rise, which may cause thermal runaway of the battery and increase the risk of fire or explosion. At the same time, due to the increase in battery heat, the soft-pack battery cell will be affected and the volume will change. When the volume expands, it is easy to cause damage to the battery cell or even fire due to factors such as squeezing and scratching. Therefore, temperature protection of soft-pack batteries is particularly important. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a soft-pack power battery with adaptive thermal conductivity and thermal shape changes, which improves the heat dissipation efficiency of the battery through heat conduction, and utilizes elastic adaptive filling to protect the battery from thermal shape volume changes, thereby improving battery safety.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides a soft-pack power battery with adaptive heat conduction and thermal morphology, comprising a soft-core battery module, a heat-conductive outer enclosure and an adaptive inner filling body, wherein the heat-conductive outer enclosure constitutes an outer shell structure of the soft-core battery module, and the outside of the heat-conductive outer enclosure is tightly wrapped by a battery shell, and the adaptive inner filling body is clamped and filled between adjacent soft-pack battery cells that are stacked to form a soft-core battery module;

[0005] The heat-conducting outer enclosure includes a module shell, a heat-conducting plate body and a heat-conducting adhesive; the module shell surrounds the soft-core battery module, and the two are limited to form an inner gap, and the module shell is in a hollow structure; the heat-conducting plate body is fitted and distributed on the outer surface of the module shell, and the battery shell surrounds the heat-conducting plate body, so that the battery shell and the module shell are limited to form an outer gap; the heat-conducting adhesive is poured into the outer gap and flows into the inner gap through the hollow structure of the module shell, and the heat-conducting adhesive is cured and used as a heat conduction medium to connect the soft-core battery module, the module shell, the heat-conducting plate body and the battery shell into a whole that can conduct heat sequentially from the inside to the outside;

[0006] The adaptive inner filling body has physical elasticity, and an expansion gap is reserved between the stacked and connected soft-pack battery cells. The adaptive inner filling body is elastically clamped and filled in the expansion gap; when the soft-pack power battery is charged and discharged, causing the soft-pack battery cell to undergo corresponding expansion and contraction structural changes, the adaptive inner filling body is compressed or adaptively rebounds and expands to a shape that is compatible with the inside of the expansion gap, so as to adapt to the volume change of the soft-pack battery cell.

[0007] Furthermore, an opening is provided on the module housing, and the outer layer gap is connected to the inner layer gap through the opening, so that the thermal conductive adhesive can flow between the outer layer gap and the inner layer gap.

[0008] Furthermore, the heat conducting plate body is vertically arranged in the height direction of the soft-pack power battery, and a plurality of vertical heat conducting plate bodies are linearly arranged and distributed in the length and width directions of the soft-pack power battery.

[0009] Furthermore, the length of the heat conducting plate body is smaller than the height of the soft core battery module, so that the upper and lower ends of the heat conducting plate body have a distance corresponding to the top and bottom ends of the soft core battery module respectively.

[0010] Furthermore, the module shell is an aluminum-plastic film, the heat-conducting plate body is an aluminum plate, and the battery shell is an aluminum alloy shell.

[0011] Further, the outer periphery of the adaptive inner filling body is connected with a circle of enclosure, and the two thickness surfaces of the adaptive inner filling body respectively form grooves with openings facing away from each other with the enclosure, and the battery body parts of the soft-packed battery cells that are adjacent to the adaptive inner filling body are respectively embedded in the corresponding grooves, so that the enclosure surrounds the length side and width side of the battery body of the soft-packed battery cell, and the enclosure is connected to the length side and width side of the battery body of the soft-packed battery cell;

[0012] The volume change of the soft-pack battery cell includes three directions: thickness, length and width;

[0013] When the volume of the soft-pack battery cell changes in the thickness direction, the adaptive inner filling body undergoes a dynamic morphological change of being compressed or adaptively rebounding and expanding to adapt to the volume change of the soft-pack battery cell in the thickness direction;

[0014] When the volume of the soft-pack battery cell changes in length and width, the adaptive inner filling body stretches or contracts laterally by stretching or compressing the enclosure connected to the soft-pack battery cell to adapt to the volume change of the soft-pack battery cell in length and width.

[0015] Furthermore, the enclosure has physical elasticity, and the physical elasticity of the adaptive inner filling body is different from that of the enclosure, and the two satisfy a relationship in elastic modulus: the elastic modulus of the adaptive inner filling body is smaller than the elastic modulus of the enclosure.

[0016] Furthermore, the adaptive inner filling body is a silicone sheet, the enclosure body is a rubber sheet, and the surfaces of the silicone sheet and the rubber sheet are coated with a heat-insulating coating.

[0017] Beneficial effect: The present invention adopts a heat-conducting plate and a heat-conducting adhesive to dissipate heat for soft-pack batteries. The heat-conducting plate is the heat dissipation body, and the heat-conducting adhesive is the heat-conducting medium. The heat-conducting adhesive as a heat-conducting medium can more efficiently take away the heat on the soft-core battery module and conduct it to the heat-conducting plate, thereby improving the heat dissipation efficiency. In addition, after the expansion gap is filled with an elastic adaptive inner filling body, it can prevent the battery cells from contacting and squeezing each other during expansion, and prevent the battery cells from losing compactness during contraction, thereby greatly improving the safety of battery cell assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the soft-pack power battery of the present invention;

[0019] Figure 2 It is a schematic diagram of the structural decomposition of the soft-pack power battery of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of the adaptive inner filling body, the enclosure body, and the soft-pack battery cell;

[0021] Figure 4 Schematic diagram of the structure of the volume change of the soft-pack battery. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1 and Figure 2As shown, a soft-pack power battery with adaptive heat conduction and thermal morphology change comprises a soft-core battery module 1, a heat-conductive outer enclosure 2 and an adaptive inner filling body 3, wherein the heat-conductive outer enclosure 2 constitutes an outer shell structure of the soft-core battery module 1, and the outside of the heat-conductive outer enclosure 2 is tightly wrapped by a battery shell 4, and the adaptive inner filling body 3 is clamped and filled between adjacent soft-pack battery cells 10 which are stacked to form the soft-core battery module 1; the heat-conductive outer enclosure 2 comprises a module shell 21, a heat-conductive plate body 22 and a heat-conductive adhesive; the module shell 21 surrounds the soft-core battery module 1, and the two are The inner gap is limited and the module shell 21 is in the shape of a hollow structure; the heat-conducting plate body 22 is fitted and distributed on the outer surface of the module shell 21, and the battery shell 4 surrounds the heat-conducting plate body 22, so that the outer gap is limited between the battery shell 4 and the module shell 21; the thermally conductive adhesive is poured into the outer gap and flows into the inner gap through the hollow structure of the module shell 21, and the thermally conductive adhesive is cured and used as a heat conduction medium to connect the soft core battery module 1, the module shell 21, the heat-conducting plate body 22 and the battery shell 4 into a whole that can conduct heat sequentially from the inside to the outside. The heat-conducting plate 22 and the thermally conductive adhesive are used to dissipate heat for the soft-pack battery. The thermally conductive plate 22 is the heat dissipation body, and the thermally conductive adhesive is the heat conduction medium. The thermally conductive adhesive as a heat conduction medium can more efficiently take away the heat on the soft-core battery module 1 and conduct it to the thermally conductive plate 22, and then the thermally conductive plate 22 is responsible for the main heat dissipation work. The thermally conductive adhesive as a heat conduction medium fills the gaps fully to avoid vacancies. Moreover, in the presence of a certain amount of heat, the solidified thermally conductive adhesive also has a certain flexibility, and can fill the area without adhesion or adhesion detachment according to its flexibility, thereby ensuring that the thermally conductive adhesive as a heat conduction medium is more fully, completely, and comprehensively connected or contacted with various parts of the battery to achieve an efficient heat conduction effect, and then can cooperate with the thermally conductive plate 22 to improve the heat dissipation efficiency.

[0024] The battery temperature changes when it is charged and discharged. When the temperature is high, the soft-pack battery 10 will expand. When the temperature drops from high to low, the soft-pack battery will shrink. The expansion can easily cause the soft-pack battery 10 to be squeezed, causing damage to the battery or even fire. The shrinkage of the soft-pack battery 10 will lead to insufficient stacking compactness. In order to solve the above problems, further, as Figure 3 and Figure 4As shown, the adaptive inner filling body 3 has physical elasticity, and an expansion gap 8 is reserved between the stacked and connected soft-packed cells 10, and the adaptive inner filling body 3 is elastically clamped and filled in the expansion gap 8; when the soft-packed power battery is charged and discharged, the soft-packed cells 10 undergo corresponding expansion and contraction structural changes, and the adaptive inner filling body 3 is compressed or adaptively rebounds and expands to a shape that is compatible with the inside of the expansion gap 8, so as to adapt to the volume change of the soft-packed cells 10. After the elastic adaptive inner filling body 3 is filled in the expansion gap 8, it can prevent the cells from contacting and squeezing each other when expanding, and prevent the cells from being compacted when contracting, thereby greatly improving the safety of cell assembly.

[0025] Therefore, the present invention improves the heat dissipation efficiency of the battery through heat conduction, and utilizes elastic adaptive filling to protect the battery from thermal morphological volume changes, thereby further improving the safety of the soft-pack battery in terms of heat dissipation, temperature control and thermal protection.

[0026] More specifically, Figure 2 As shown, the module housing 21 is provided with an opening 21a, and the outer layer gap is connected to the inner layer gap through the opening 21a, so that the thermal conductive adhesive can conduct between the outer layer gap and the inner layer gap. In order to improve the heat dissipation efficiency of the heat conductive plate body 22 as the heat dissipation body, in the present invention, the heat conductive plate body 22 is vertically arranged in the height direction of the soft-pack power battery, and a plurality of vertical heat conductive plate bodies 22 are linearly arranged and distributed in the length and width directions of the soft-pack power battery.

[0027] Thermally conductive adhesive is used as a heat conduction medium. In order to ensure that the right angles of the battery can also be filled with thermally conductive adhesive, such as Figure 2 As shown, the length of the heat conducting plate 22 is smaller than the height of the soft core battery module 1 , so that the upper and lower ends of the heat conducting plate 22 have a distance corresponding to the top and bottom ends of the soft core battery module 1 .

[0028] In the present invention, preferably, the module housing 21 is an aluminum-plastic film, the heat-conducting plate body 22 is an aluminum plate, and the battery housing 4 is an aluminum alloy housing.

[0029] The volume change of the soft-pack battery cell 10 in the thickness direction is more obvious than that in the length and width directions. In order to ensure the comprehensiveness of the adaptive filling coverage of the adaptive inner filling body 3 when the volume of the soft-pack battery cell 10 changes, in the present invention, Figure 3 and Figure 4As shown, the outer periphery of the adaptive inner filling body 3 is connected with a circle of enclosure 5, and the two thickness surfaces of the adaptive inner filling body 3 respectively form grooves 6 with openings facing each other with the enclosure 4, and the battery body parts of the soft-pack battery cells 10 that are adjacent to the adaptive inner filling body 3 are respectively embedded in the corresponding grooves 6, so that the enclosure 5 surrounds the length side and width side of the battery body of the soft-pack battery cell 10, and the enclosure 5 is connected to the length side and width side of the battery body of the soft-pack battery cell 10; the volume of the soft-pack battery cell 10 The changes include three directions: thickness, length and width; when the volume of the soft-pack battery 10 changes in the thickness direction, the adaptive inner filling body 3 produces a dynamic morphological change of being compressed or adaptively rebounding and expanding to adapt to the volume change of the soft-pack battery 10 in the thickness direction; when the volume of the soft-pack battery 10 changes in the length and width directions, the adaptive inner filling body 3 stretches or contracts laterally by stretching or compressing the enclosure 5 connected to the soft-pack battery 10 to adapt to the volume change of the soft-pack battery 10 in the length and width directions. By connecting the enclosure 5 at the periphery of the adaptive inner filling body 3, the main self-adaptive volume change filling can be achieved in the thickness direction, and the self-adaptive volume change filling in the length and width directions can also be taken into account, ensuring that the filling of the adaptive inner filling body 3 to improve the safety and compactness of the soft-pack power battery can be more timely and comprehensive.

[0030] It is particularly important to note that in order to achieve the morphological change of the adaptive inner filling body 3 in the length and width directions by the following movement of the enclosure 5, the enclosure 5 must have a certain elasticity so that it can follow the morphological changes of the soft-pack battery cell 10 in the length and width directions. Therefore, the enclosure 5 of the present invention has physical elasticity. At the same time, it is also necessary to note that in order to improve the effect of the enclosure 5 linking the adaptive inner filling body 3 and avoid poor linkage effect or failure, there is a difference between the physical elasticity of the adaptive inner filling body 3 and the physical elasticity of the enclosure 5, and the two satisfy the relationship in elastic modulus: the elastic modulus of the adaptive inner filling body 3 is smaller than the elastic modulus of the enclosure 5.

[0031] In the present invention, preferably, the adaptive inner filling body 3 is a silicone sheet, and the enclosure 5 is a rubber sheet, and the surfaces of the silicone sheet and the rubber sheet are coated with a heat-insulating coating.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A soft-pack power battery with adaptive heat conduction and thermal morphology, comprising a soft-core battery module (1), a heat-conductive outer enclosure (2) and an adaptive inner filling body (3), wherein the heat-conductive outer enclosure (2) constitutes an outer shell structure of the soft-core battery module (1), and the exterior of the heat-conductive outer enclosure (2) is tightly wrapped by a battery shell (4), and the adaptive inner filling body (3) is clamped and filled between adjacent soft-pack battery cells (10) that are stacked to form the soft-core battery module (1); Features: The heat-conducting outer enclosure (2) comprises a module shell (21), a heat-conducting plate body (22) and a heat-conducting adhesive; the module shell (21) surrounds the soft-core battery module (1), and the two are limited to form an inner gap, and the module shell (21) is in a hollow structure; the heat-conducting plate body (22) is arranged on the outer surface of the module shell (21), and the battery shell (4) surrounds the heat-conducting plate body (22), so that the battery shell (4) and the module shell (21) are limited to form an outer gap; the heat-conducting adhesive is poured into the outer gap and flows into the inner gap through the hollow structure of the module shell (21), and the heat-conducting adhesive is solidified and used as a heat conduction medium to connect the soft-core battery module (1), the module shell (21), the heat-conducting plate body (22) and the battery shell (4) into a whole capable of sequentially conducting heat from the inside to the outside; The adaptive inner filling body (3) has physical elasticity, and an expansion gap (8) is reserved between the stacked and connected soft-pack battery cells (10), and the adaptive inner filling body (3) is elastically clamped and filled in the expansion gap (8); when the soft-pack power battery is charged and discharged, causing the soft-pack battery cell (10) to undergo corresponding expansion and contraction structural changes, the adaptive inner filling body (3) is compressed or adaptively rebounds and expands to a shape that is compatible with the inside of the expansion gap (8), so as to adapt to the volume change of the soft-pack battery cell (10).

2. A soft-pack power battery with adaptive thermal conductivity and thermal morphology according to claim 1, characterized in that: The module housing (21) is provided with an opening (21a), and the outer layer gap is connected to the inner layer gap through the opening (21a), so that the thermal conductive glue can flow between the outer layer gap and the inner layer gap.

3. A soft-pack power battery with adaptive thermal conductivity and thermal morphology according to claim 1, characterized in that: The heat conducting plate body (22) is arranged vertically in the height direction of the soft-pack power battery, and a plurality of vertical heat conducting plate bodies (22) are linearly arranged and distributed in the length and width directions of the soft-pack power battery.

4. A soft-pack power battery with adaptive thermal conductivity and thermal morphology according to claim 3, characterized in that: The length of the heat-conducting plate body (22) is smaller than the height of the soft-core battery module (1), so that the upper and lower ends of the heat-conducting plate body (22) have a distance corresponding to the top and bottom ends of the soft-core battery module (1).

5. A soft-pack power battery with adaptive thermal conductivity and thermal morphology according to any one of claims 1 to 4, characterized in that: The module housing (21) is an aluminum-plastic film, the heat-conducting plate body (22) is an aluminum plate, and the battery housing (4) is an aluminum alloy housing.

6. The soft-pack power battery with adaptive thermal conductivity and thermal morphology according to claim 1, characterized in that: The outer periphery of the adaptive inner filling body (3) is connected to a circle of an enclosure (5); two thickness surfaces of the adaptive inner filling body (3) respectively form grooves (6) with openings facing away from each other with the enclosure (4); the battery body parts of the soft-packed battery cells (10) that are adjacent to the adaptive inner filling body (3) are respectively embedded in the corresponding grooves (6), so that the enclosure (5) surrounds the length side and width side of the battery body of the soft-packed battery cell (10), and the enclosure (5) is connected to the length side and width side of the battery body of the soft-packed battery cell (10); The volume change of the soft-package battery core (10) includes three directions: thickness, length and width; When the volume of the soft-package battery core (10) changes in the thickness direction, the adaptive inner filling body (3) undergoes a dynamic morphological change of being compressed or adaptively rebounding and expanding to adapt to the volume change of the soft-package battery core (10) in the thickness direction; When the volume of the soft-pack battery cell (10) changes in the length and width directions, the adaptive inner filling body (3) is stretched or contracted laterally by stretching or compressing the enclosure (5) connected to the soft-pack battery cell (10), so as to adapt to the volume change of the soft-pack battery cell (10) in the length and width directions.

7. A soft-pack power battery with adaptive thermal conductivity and thermal morphology according to claim 6, characterized in that: The enclosure (5) has physical elasticity, and the physical elasticity of the adaptive inner filling body (3) is different from that of the enclosure (5), and the two satisfy a relationship in terms of elastic modulus: the elastic modulus of the adaptive inner filling body (3) is smaller than the elastic modulus of the enclosure (5).

8. The soft-pack power battery with adaptive thermal conductivity and thermal morphology according to claim 7, characterized in that: The adaptive inner filling body (3) is a silicone sheet, and the enclosure body (5) is a rubber sheet. The surfaces of the silicone sheet and the rubber sheet are both coated with a heat-insulating coating.

Images