Battery module structure with battery cell buffer protection function

Abstract

The invention relates to the technical field of battery modules, in particular to a battery module structure with a battery cell buffer protection function. Comprising a module shell, and a module end plate is arranged in the module shell; the number of the module end plates is two. According to the battery module, the buffer pad is additionally arranged between the outer side battery cell and the insulating sheet in the battery module, so that the buffer pad can be blocked between the battery cell and the insulating sheet which are subjected to volume expansion and shrinkage in the charge-discharge cycle process of the battery cell, and the buffer pad can block expansion force applied to the insulating sheet by the battery cell; the contact position of the battery cell and the insulation sheet is prevented from being abraded, so that the insulation protection effect of the insulation sheet is ensured, short circuit among components in the battery module is prevented, and the use safety of the battery module is further ensured; and the reduction of the chemical reaction efficiency in the battery caused by the damage of the insulating layer of the battery core shell is prevented, so that the charge-discharge capacity, the capacity retention ratio and the cycle life of the battery are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of battery modules, in particular to a battery module structure with a battery core buffering and protection function. Background Art

[0002] A battery module is a battery assembly that is composed of multiple single cells or battery units and is designed to improve performance such as voltage, capacity or power. They are widely used in various portable devices, electric vehicles, energy storage systems and other fields. Battery modules not only provide more stable and powerful power output, but are also designed to be easy to manage, maintain and replace.

[0003] The existing battery module uses PC sheets or other plastic parts to separate the outer battery cells from the module end plates. The PC sheets and injection molded parts are directly attached to the battery cells to play a high-voltage insulation protection role to prevent short circuits between the components in the battery module, thereby ensuring the safety of the battery module. However, the battery cells will expand and contract in volume during the charge and discharge cycle. This physical change will exert stress on the surrounding structure. This stress will directly act between the PC sheets or injection molded parts. As the battery cells are continuously charged and discharged, the contact position between the battery cells and the PC sheets or injection molded parts is prone to wear, which will lead to a decrease in battery performance. In addition, damage to the insulating layer will also reduce the efficiency of the chemical reaction inside the battery, thereby affecting the battery's charge and discharge capabilities, capacity retention rate and cycle life;

[0004] In view of this, in order to overcome the above technical problems, the present invention proposes a battery module structure with a cell buffer protection function, which solves the above technical problems. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, the present invention proposes a battery module structure with a battery cell buffering protection function. The present invention adds a buffer pad between the outer battery cell and the insulating sheet in the battery module, so that the buffer pad can be blocked between the battery cell and the insulating sheet that undergo volume expansion and contraction during the battery cell charge and discharge cycle, so that the buffer pad can block the expansion force exerted by the battery cell on the insulating sheet; avoid wear at the contact position between the battery cell and the insulating sheet, not only ensure the insulation protection function of the insulating sheet to prevent short circuits between components in the battery module, thereby ensuring the safety of the battery module; but also prevent damage to the insulating layer of the battery cell shell from reducing the chemical reaction efficiency inside the battery, thereby ensuring the battery's charge and discharge capabilities, capacity retention rate and cycle life.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a battery module structure with a cell buffer protection function described in the present invention comprises:

[0007] A module housing, wherein a module end plate is disposed inside the module housing; the module end plates are provided in two numbers; a liquid cooling plate is disposed between the two module end plates; the liquid cooling plate is fixedly connected to the bottom end of the module housing; a battery cell is fixedly installed on the upper end of the liquid cooling plate,

[0008] A buffer pad, the buffer pad is located between the module end plate and the battery cell; the buffer pad is connected to the battery cell close to the module end plate; an insulating sheet is arranged between the buffer pad and the module end plate; adhesive backing is bonded to both side walls of the insulating sheet; the insulating sheet is bonded to the buffer pad and the module end plate through the adhesive backing.

[0009] Preferably, the buffer pad comprises a rubber plate; PET films are fixedly connected to both side walls of the rubber plate; a release paper is provided on a side of the PET film away from the rubber plate; and the release paper is bonded to the PET film by means of adhesive.

[0010] Preferably, the buffer pad comprises a rubber pad; a clamping plate is fixedly connected to the side wall of the rubber pad; strip grooves are provided on the inner walls on both sides of the module housing; two extrusion plates are slidingly and sealingly connected in the same strip groove; a screw rod is rotatably connected in the strip groove; the threads at both ends of the screw rod are arranged oppositely; the two extrusion plates are spirally connected to the two ends of the screw rod; a sliding groove is provided on the side of the clamping plate away from the rubber pad.

[0011] Preferably, a circular groove is provided on the inner wall of the slide groove; a clamping groove is provided on the side wall of the extrusion plate; a clamping block is connected in a sliding seal in the circular groove; and the clamping block is fixedly connected to the bottom of the circular groove via a connecting spring.

[0012] Preferably, a thread groove is provided at the upper end of the rubber pad; a screw is threadedly connected to the inner thread of the thread groove; an air passage is provided inside the clamping plate; one end of the air passage is connected to the thread groove, and the other end is connected to the circular groove.

[0013] Preferably, a liquid storage cavity is provided inside the rubber pad; the liquid storage cavity is wavy; a connecting plate is inlaid at the lower end of the rubber pad; a liquid inlet hole and a liquid outlet hole connected to the liquid storage cavity are provided at the lower end of the connecting plate; a connecting port is provided on the upper end surface of the liquid cooling plate; a sealing block is slidingly sealed in the connecting port; the sealing block is connected to the inner wall of the connecting port by a tower spring.

[0014] Preferably, the liquid inlet and the liquid outlet are both slidably and sealingly connected with connecting pipes; the connecting pipes are connected to the connecting plate via a supporting spring.

[0015] Preferably, a positioning groove connected to the liquid storage cavity is formed at one end of the clamping plate away from the module end plate; two rubber pads are provided; a liquid delivery pipe is provided between the two rubber pads; the liquid delivery pipe is used to connect the positioning grooves of two opposite clamping plates.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The present invention adds a buffer pad between the outer battery cell and the insulating sheet in the battery module, so that the buffer pad can be blocked between the battery cell and the insulating sheet that undergo volume expansion and contraction during the battery cell charge and discharge cycle, so that the buffer pad can block the expansion force exerted by the battery cell on the insulating sheet; avoid wear at the contact position between the battery cell and the insulating sheet, not only ensure the insulation protection function of the insulating sheet to prevent short circuits between various components in the battery module, thereby ensuring the safety of the battery module; but also prevent damage to the insulating layer of the battery cell shell from reducing the chemical reaction efficiency inside the battery, thereby ensuring the battery's charge and discharge capacity, capacity retention rate and cycle life.

[0018] 2. The present invention sets an extrusion plate so that the extrusion plate can pull the rubber pads on both sides of the battery pack to fit tightly against the battery cells on the outside of the battery pack. On the one hand, the extrusion bonding can increase the contact area between the buffer pad and the battery cell, thereby more evenly dispersing the expansion force during the charging and discharging process and reducing wear. On the other hand, there is no need to use backing glue to bond the buffer pad to the battery cell, thereby reducing the risk of bonding failure caused by thermal decomposition or aging of the adhesive. In addition, the curing of the backing glue requires waiting for a certain time, but through extrusion bonding, this waiting time can be omitted, thereby speeding up the assembly process and improving the assembly efficiency of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0020] Figure 1 is a stereogram of the present invention with a rubber sheet installed;

[0021] Figure 2 It is a three-dimensional diagram of the connection of the rubber plates inside the module housing in the present invention;

[0022] Figure 3 Schematic diagram of the structure of the rubber sheet used in the present invention;

[0023] Figure 4 is a stereogram of the present invention with a rubber pad installed;

[0024] Figure 5 yes Figure 4 The enlarged view of point A in the middle;

[0025] Figure 6 It is a schematic diagram of the structure of the rubber pad used in the present invention;

[0026] Figure 7 yes Figure 6 The enlarged view of point B in the middle;

[0027] Figure 8is a schematic structural diagram of a connecting plate used in the present invention;

[0028] Fig. 9 yes Figure 8 Enlarged view of point C in the middle;

[0029] In the figure: 1. module shell; 11. module end plate; 12. liquid cooling plate; 13. battery cell; 14. insulating sheet; 15. adhesive; 16. connecting port; 161. sealing block; 162. conical spring; 2. buffer pad; 21. rubber plate; 211. PET film; 212. release paper; 22. rubber pad; 221. clamping plate; 222. slide groove; 23. strip groove; 231. extrusion plate; 232. lead screw; 233. clamping groove; 24. round groove; 241. clamping block; 242. connecting spring; 25. threaded groove; 251. screw; 252. airway; 26. liquid storage chamber; 261. connecting plate; 262. liquid inlet hole; 27. connecting pipe; 271. supporting spring; 28. positioning groove; 281. liquid delivery pipe. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0031] like Figures 1 to 9 As shown, the battery module structure with a cell buffer protection function described in the present invention includes the following embodiments:

[0032] Embodiment 1:

[0033] A battery module structure with a battery cell buffer protection function, comprising:

[0034] A module housing 1, wherein a module end plate 11 is disposed inside the module housing 1; two module end plates 11 are disposed; a liquid cooling plate 12 is disposed between the two module end plates 11; the liquid cooling plate 12 is fixedly connected to the bottom end of the module housing 1; a battery cell 13 is fixedly mounted on the upper end of the liquid cooling plate 12;

[0035] A buffer pad 2, wherein the buffer pad 2 is located between the module end plate 11 and the battery cell 13; the buffer pad 2 is connected to the battery cell 13 close to the module end plate 11; an insulating sheet 14 is provided between the buffer pad 2 and the module end plate 11; adhesive backing 15 is bonded to both side walls of the insulating sheet 14; the insulating sheet 14 is bonded to the buffer pad 2 and the module end plate 11 through the adhesive backing 15.

[0036] In this embodiment: the buffer pad 2 includes a rubber plate 21; the two side walls of the rubber plate 21 are fixedly connected with a PET film 211; a release paper 212 is provided on one side of the PET film 211 away from the rubber plate 21; the release paper 212 is bonded to the PET film 211 by a backing adhesive 15;

[0037] During operation, the outer battery cell 13 of the existing battery module is separated from the module end plate 11 by a PC sheet or other plastic parts. The PC sheet and the injection molded parts are directly attached to the battery cell 13 to play a high-voltage insulation protection role to prevent short circuits between the components in the battery module, thereby ensuring the safety of the battery module. However, the battery cell 13 will expand and shrink in volume during the charge and discharge cycle. This physical change will exert stress on the surrounding structure. This stress will directly act between the PC sheet or the injection molded parts. As the battery cell 13 is continuously charged and discharged, the contact position between the battery cell 13 and the PC sheet or the injection molded parts is prone to wear, which will cause damage to the insulating layer and reduce the chemical reaction efficiency inside the battery, thereby affecting the battery's charge and discharge capabilities, capacity retention rate and cycle life.

[0038] To this end, the present invention adds a buffer pad 2 between the outer battery cell 13 and the insulating sheet 14 in the battery module, so that the buffer pad 2 can be blocked between the battery cell 13 and the insulating sheet 14 that undergo volume expansion and contraction during the charge and discharge cycle of the battery cell 13, so that the buffer pad 2 can block the expansion force exerted by the battery cell 13 on the insulating sheet 14; avoid wear at the contact position between the battery cell 13 and the insulating sheet 14, not only ensure the insulation protection function of the insulating sheet 14 to prevent short circuits between various components in the battery module, thereby ensuring the safety of the battery module; it also prevents damage to the insulating layer of the outer shell of the battery cell 13 from causing a decrease in the chemical reaction efficiency inside the battery, thereby ensuring the charge and discharge capacity, capacity retention rate and cycle life of the battery;

[0039] In the initial state, the liquid cooling plate 12 is fixed to the lower end of the module housing 1, and a liquid inlet and a liquid outlet are respectively provided at both ends of the liquid cooling plate 12. When the battery module is installed on an electric vehicle, the liquid inlet of the liquid cooling plate 12 can be connected to the delivery port of the coolant delivery pump of the electric vehicle, and the liquid outlet can be connected to the return pipe of the coolant delivery pump to fill the coolant into the liquid cooling plate 12; and because the bottom end of the battery cell 13 is in contact with the upper end surface of the liquid cooling plate 12, the liquid cooling plate 12 filled with coolant can absorb the heat generated by the battery cell 13 through the upper end surface and the bottom end of the battery cell 13, thereby realizing cooling of the battery cell 13;

[0040] Before the user installs the battery module on the upper end of the liquid cooling plate 12, the user first assembles the battery module, that is, uses an assembly tool to divide the multiple battery cells 13 into two rows, and the number of battery cells 13 in each row is set to ten, so that the two rows of battery cells 13 are combined into the required battery pack, and then the buffer pad 2 is placed at both ends of the outer battery cells 13 of the battery pack, and then the release paper 212 is torn off, so that the adhesive surface of the back glue 15 of the buffer pad 2 close to the battery cell 13 is exposed, so that the buffer pad 2 is bonded to the battery cell 13 through the back glue 15, and the side of the buffer pad 2 away from the battery cell 13 is bonded to the battery cell 13 through the back glue 15. The insulating sheet 14 is bonded, and the module end plate 11 is bonded to the side of the insulating sheet 14 away from the buffer pad 2 through the back glue 15. Finally, the module end plates 11 at both ends are extruded by the assembly tool, so that the battery cell 13, the module end plate 11, the insulating sheet 14 and the buffer pad 2 can be firmly bonded due to extrusion, and the back glue 15 for bonding the buffer pad 2 and the battery cell 13 is set to the whole surface of the back glue 15. This is because during the charging and discharging process of the battery cell 13, it is easy to be affected by temperature changes and cause volume expansion and contraction. The setting of the whole surface of the back glue 15 can better maintain the bonding strength and the battery cell 13. Stability; if the adhesive 15 is only part of the area, the adhesive part will be subjected to greater stress, accelerating the wear and failure of the adhesive layer; therefore, the setting of the entire adhesive 15 can ensure that the buffer pad 2 and the battery cell 13 have comprehensive contact and adhesion, thereby providing uniform support and dispersion of force; finally, the extruded and bonded battery pack is placed in the module housing 1 using the assembly tool, and the battery packs are connected in series, and then the battery packs connected in series are connected to the electrodes of the module housing 1, and finally the welding process is transferred to weld the module end plate 11 to the module housing 1 The insulation sheet 14 in the battery module structure mainly plays the role of electrical insulation protection to prevent short circuits between components in the battery module, thereby ensuring the safety of the battery module; the buffer pad 2 in the battery module mainly plays the role of buffer protection for the battery cell 13; it prevents wear and tear at the contact position between the battery cell 13 and the insulation sheet 14, and prevents the insulation layer of the battery cell 13 from being damaged by wear and tear, which leads to a decrease in the chemical reaction efficiency inside the battery, thereby ensuring the battery's charge and discharge capacity, capacity retention rate and cycle life;

[0041] In the initial state, the side of the PET film 211 away from the rubber plate 21 is coated with a backing glue 15 layer, and the release paper 212 is adhered to the side of the backing glue 15 layer away from the PET film 211; the rubber plate 21 in the buffer pad 2 is a hard rubber plate 21, which is the main structural support of the buffer pad 2 and plays a role in absorbing and dispersing the pressure generated by the battery cell 13 during the charging and discharging process; the hard rubber plate 21 also has a certain elasticity, which can provide a certain displacement space when the battery cell 13 expands, and at the same time absorb and reduce the pressure generated by the battery cell 13 to prevent direct physical impact or vibration between the battery cell 13 and the insulating sheet 14; in addition, the hard rubber plate 21 can also provide basic insulation and protection to prevent the battery cell 13 from being affected by environmental factors; and the PET film 21 is coated with a backing glue 15 layer on the side of the rubber plate 21; the release paper ... The provision of the ET film 211 provides an additional protective layer for the buffer pad 2; since PET has good mechanical strength and chemical stability, it can resist mechanical wear together with the rubber sheet 21, thereby extending the service life of the buffer pad 2; and the release paper 212 is bonded to the side of the back glue 15 away from the PET film 211, thereby protecting the back glue 15 from being contaminated or adhered during transportation and storage; during installation, the release paper 212 can be torn off the PET film 211 to expose the back glue 15, thereby fixing the buffer pad 2 in an appropriate position; therefore, the use of the release paper 212 simplifies the installation process, avoids bonding errors, and reduces the preparation work during installation; so that the practical application effect of the present invention is further improved.

[0042] Embodiment 2:

[0043] The buffer pad 2 includes a rubber pad 22; a clamping plate 221 is fixedly connected to the side wall of the rubber pad 22; a strip groove 23 is provided on the inner walls on both sides of the module housing 1; two extrusion plates 231 are slidingly and sealingly connected in the same strip groove 23; a screw rod 232 is rotatably connected in the strip groove 23; the threads at both ends of the screw rod 232 are arranged oppositely; the two extrusion plates 231 are spirally connected to the two ends of the screw rod 232; a sliding groove 222 is provided on the side of the clamping plate 221 away from the rubber pad 22.

[0044] In this embodiment: a circular groove 24 is formed on the inner wall of the slide groove 222; a clamping groove 233 is formed on the side wall of the extrusion plate 231; a clamping block 241 is slidably and sealably connected inside the circular groove 24; the clamping block 241 is fixedly connected to the bottom of the circular groove 24 via a connecting spring 242.

[0045] In this embodiment: a thread groove 25 is formed on the upper end of the rubber pad 22; a screw 251 is connected to the inner thread of the thread groove 25; an air passage 252 is formed inside the clamping plate 221; one end of the air passage 252 is connected to the thread groove 25, and the other end is connected to the circular groove 24;

[0046] During operation, heat is generated during the charging and discharging process of the battery cell 13, and the bonding performance of adhesives such as the back glue 15 is easily affected by temperature; especially in a high temperature environment, the back glue 15 will not only soften, resulting in a decrease in bonding strength; but also chemically decompose, i.e., age, after long-term exposure to a high temperature environment, the back glue 15 will also suffer from aging problems, thereby losing its bonding strength, resulting in the rubber pad 22 and the battery cell 13.

[0047] In this regard, the present invention provides an extrusion plate 231 so that the extrusion plate 231 can pull the rubber pads 22 on both sides of the battery pack to fit tightly with the battery cells 13 outside the battery pack. On the one hand, the extrusion bonding can increase the contact area between the buffer pad 2 and the battery cell 13, thereby more evenly dispersing the expansion force during the charging and discharging process and reducing wear. On the other hand, there is no need to use the backing glue 15 to bond the buffer pad 2 to the battery cell 13, thereby reducing the risk of bonding failure caused by thermal decomposition or aging of the adhesive. In addition, the curing of the backing glue 15 requires waiting for a certain time, and through extrusion bonding, this waiting time can be omitted, thereby speeding up the assembly process and improving the assembly efficiency of the battery module.

[0048] In the initial state, a flange fixedly connected to the extrusion plate 231 is provided on one side away from the module housing 1, and a slot is provided on the upper end of the screw rod 251; the user inserts a flat-blade screwdriver into the slot at the upper end of the screw rod 251, thereby rotating the screw rod 251 so that the screw rod 251 rotates in the direction of extending out of the thread groove 25; since the screw rod 251 is made of hard rubber material, there is a rotating sealing contact between the screw rod 251 and the inner wall of the thread groove 25, and since the thread groove 25 is filled with hydraulic oil, the thread groove 25 is connected to the circular groove 24, and in the process of the screw 251 extending out of the thread groove 25, the space in the thread groove 25 increases, so that the hydraulic oil in the circular groove 24 flows back into the thread groove 25, and at this time, the block 241 located in the circular groove 24 will be connected to the spring 242. The buffer pad 2 is pulled into the circular groove 24, and then the buffer pad 2 with the insulating sheet 14 attached is placed in the module housing 1, so that the buffer pad 2 drives the clamping plates 221 fixed on both sides to the top of the module housing 1, so that the slide groove 222 of the side wall of the clamping plate 221 is aligned with the extrusion plate 231, so that the flange of the extrusion plate 231 is inserted into the slide groove 222 of the clamping plate 221; because the clamping block 241 is located in the circular groove 24 under the pull of the connecting spring 242, the clamping block 241 will not extend into the slide groove 222 and block the flange of the extrusion plate 231 from sliding in the slide groove 222, so as to ensure that the extrusion plate 231 completely enters the slide groove 222 and contacts with the bottom of the slide groove 222, so that the clamping groove 233 of the flange side wall of the extrusion plate 231 is opposite to the circular groove 24, and at this time, the screw 251 is rotated to enter The thread groove 25 is inserted into the thread groove 25, so that the hydraulic oil in the thread groove 25 enters the circular groove 24 through the air channel 252, and pushes the block 241 in the circular groove 24 to stretch the connecting spring 242 out of the circular groove 24, so that the block 241 extending out of the circular groove 24 enters the slide groove 222, so that the end of the block 241 away from the circular groove 24 is inserted into the slot 233 directly opposite to the circular groove 24, so that the block 241 connects the extrusion plate 231 and the clamping plate 221 of the rubber pad 22; since there are two extrusion plates 231 in the same slide groove 222, two rubber pads 22 need to be connected with the two extrusion plates 231 in the same strip groove 23, and the two rubber pads 22 after connection are bonded with the insulating sheet 14 on the side away from each other, and finally the required battery cell 13 is placed in the two rubber pads 22; when the battery cells 13 are arranged, the screw rod 232 is rotated so that the screw rod 232 drives the two extrusion plates 231 to move towards each other, so that the two extrusion plates 231 push the clamping plates 221 connected thereto to drive the rubber pads 22 to move towards each other, so that the two rubber pads 22 are close to each other and clamp the arranged battery packs, so that the rubber pads 22 and the battery packs are tightly fitted due to the clamping; then the module end plate 11 is bonded to the side of the insulating sheet 14 away from the rubber pads 22, and then the battery packs are connected in series, and then the battery packs after series connection are connected to the electrodes of the module shell 1, and finally the flow is transferred to the welding process, and the module end plate 11 is welded to the module shell 1 to ensure the sealing and structural strength of the battery module.

[0049] In this embodiment: a liquid storage cavity 26 is provided inside the rubber pad 22; the liquid storage cavity 26 is wavy; a connecting plate 261 is embedded at the lower end of the rubber pad 22; a liquid inlet hole 262 and a liquid outlet hole connected to the liquid storage cavity 26 are provided at the lower end of the connecting plate 261; a connecting port 16 is provided on the upper end surface of the liquid cooling plate 12; a sealing block 161 is slidingly sealed in the connecting port 16; the sealing block 161 is connected to the inner wall of the connecting port 16 via a conical spring 162.

[0050] In this embodiment: the liquid inlet hole 262 and the liquid outlet hole are both slidably and sealedly connected with a connecting pipe 27; the connecting pipe 27 is connected to the connecting plate 261 via a supporting spring 271.

[0051] In this embodiment: the end of the clamping plate 221 away from the module end plate 11 is provided with a positioning groove 28 connected to the liquid storage chamber 26; two rubber pads 22 are provided; a liquid delivery pipe 281 is provided between the two rubber pads 22; the liquid delivery pipe 281 is used to connect the positioning grooves 28 of the two opposite clamping plates 221;

[0052] During operation, temperature is an important factor affecting the volume change of the battery; an increase in temperature usually causes the battery material and the overall volume of the battery to expand, while a decrease in temperature causes contraction. The heat generated by the battery cell 13 during operation mainly comes from the chemical reaction inside it, and this heat is transferred to various parts of the battery cell 13, including the front and back of the battery cell 13, in the form of heat conduction; although the liquid cooling plate 12 can effectively cool the battery cell 13, the liquid cooling plate 12 is in contact with the bottom of the battery cell 13, resulting in low cooling efficiency on the front and back of the battery cell 13, and the rubber pad 22 has a certain thermal resistance, which reduces the efficiency of heat transfer from the battery cell 13 to the cooling system, thereby affecting the overall heat dissipation effect of the battery module;

[0053] In this regard, the present invention provides a liquid storage cavity 26 inside the rubber pad 22, so that the liquid storage cavity 26 can be connected to the liquid cooling plate 12, so that the coolant in the liquid cooling plate 12 can flow into the liquid storage cavity 26 of the rubber pad 22, so that when the heat generated by the battery cell 13 is transferred to the liquid storage cavity 26 through the battery cell 13 shell and the outer wall of the rubber pad 22, the heat transferred to the liquid storage cavity 26 can be absorbed by the coolant, thereby improving the heat dissipation effect of the rubber pad 22 on the battery cell 13, so that the present invention can improve the heat dissipation efficiency of the battery module, and the practicality of the present invention is further enhanced;

[0054] In the initial state, the liquid inlet hole 262 and the liquid outlet hole are respectively provided at the lower ends of the connecting plates 261 of the two rubber pads 22, that is, the rubber pad 22 with the liquid inlet hole 262 is close to the end of the liquid cooling plate 12 with the liquid inlet, and the rubber pad 22 with the liquid outlet hole is close to the end of the liquid cooling plate 12 with the liquid outlet; after the user connects the rubber pad 22 with the extrusion plate 231, the connecting plate 261 at the lower end of the rubber pad 22 is in sliding contact with the liquid cooling plate 12, and the connecting pipe 261 at the lower end of the connecting plate 261 is connected to the connecting plate 261. 7 is blocked by the liquid cooling plate 12, so that the connecting tube 27 squeezes the supporting spring 271 into the liquid outlet hole or the liquid inlet hole 262; when the screw rod 232 drives the squeezing plate 231 to drive the two rubber pads 22 to approach each other, the two rubber pads 22 drive the two connecting tubes 27 to approach each other, so that the two connecting tubes 27 are in sliding contact with the upper end surface of the liquid cooling plate 12 until the rubber pad 22 clamps the battery pack. At this time, the connecting tube 27 is located above the connecting port 16 of the liquid cooling plate 12. The tube 27 is pushed by the restoring force of the supporting spring 271 to enter the connecting port 16, so that the connecting tube 27 pushes the sealing block 161 in the connecting port 16 to squeeze the conical spring 162 into the connecting port 16; when the connecting tube 27 is fully inserted into the connecting port 16, the connecting tube 27 is slidably sealed and connected with the connecting port 16; when the external coolant delivery pump delivers coolant into the liquid cooling plate 12, the coolant will enter the connecting tube 27 through the connecting port 16, and flow into the liquid storage cavity 26 of the rubber pad 22 from the connecting tube 27, so that the coolant entering the liquid storage cavity 26 will cool down the battery cell 13 in contact with the rubber pad 22 through the outer wall of the rubber pad 22, and the liquid storage cavity 26 is set to be wavy because the curved wavy flow channel can increase the path length of the coolant flowing inside the liquid cooling plate 12, which means that the coolant stays in the liquid storage cavity 26 for a longer time, thereby increasing the heat exchange time between the coolant and the battery cell 13, and improving the heat exchange efficiency;When the coolant flows to the positioning groove 28, the coolant will flow into the liquid delivery pipe 281 through the positioning groove 28, so that the coolant flowing into the liquid delivery pipe 281 can flow into the liquid storage cavity 26 in the rubber pad 22 near the liquid outlet, and flow into the liquid cooling plate 12 from the liquid outlet hole at the lower end of the rubber pad 22 near the liquid outlet, and finally flow out through the liquid outlet of the liquid cooling plate 12. By setting the liquid delivery pipe 281, the coolant flowing into the rubber pad 22 with the liquid inlet hole 262 can flow into the rubber pad 22 with the liquid outlet hole through the liquid delivery pipe 281. When the coolant flows in the liquid delivery pipe 281, the coolant can perform heat exchange with the side wall of the battery pack through the closure of the liquid delivery pipe 281, thereby improving the heat dissipation efficiency and heat dissipation effect of the battery module, and the coolant flowing into the rubber pad 22 with the liquid inlet hole 262 enters the liquid delivery pipe 28. 1 instead of directly flowing into the liquid cooling plate 12, because the coolant flowing into the rubber pad 22 with the liquid inlet hole 262 absorbs the temperature of the front side of the battery cell 13, so that the temperature of the coolant will rise to a certain extent, and the coolant flowing into the rubber pad 22 with the liquid inlet hole 262 will flow through the bottom of the battery cell 13 with the coolant with low temperature during the process of entering the liquid cooling plate 12, so that the temperature of the coolant near the liquid inlet of the liquid cooling plate 12 rises due to heat exchange, reducing the cooling effect of the coolant in the liquid cooling plate 12 on the battery cell 13; therefore, the coolant flowing into the rubber pad 22 with the liquid inlet hole 262 enters the liquid delivery pipe 281, which can improve the cooling effect of the coolant in the liquid cooling plate 12 on the lower end of the battery cell 13, thereby further improving the practical application effect of the present invention. ;

[0055] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A battery module structure with a cell buffer protection function, comprising: A module housing (1), wherein a module end plate (11) is arranged inside the module housing (1); two module end plates (11) are arranged; a liquid cooling plate (12) is arranged between the two module end plates (11); the liquid cooling plate (12) is fixedly connected to the bottom end of the module housing (1); a battery cell (13) is fixedly mounted on the upper end of the liquid cooling plate (12), characterized in that: A buffer pad (2), the buffer pad (2) being located between a module end plate (11) and a battery cell (13); the buffer pad (2) being connected to the battery cell (13) close to the module end plate (11); an insulating sheet (14) being provided between the buffer pad (2) and the module end plate (11); adhesive backing (15) being bonded to both side walls of the insulating sheet (14); and the insulating sheet (14) being bonded to the buffer pad (2) and the module end plate (11) via the adhesive backing (15).

2. A battery module structure with a cell buffer protection function according to claim 1, characterized in that: The buffer pad (2) comprises a rubber plate (21); two side walls of the rubber plate (21) are fixedly connected with a PET film (211); a side of the PET film (211) away from the rubber plate (21) is provided with a release paper (212); and the release paper (212) is bonded to the PET film (211) via a backing adhesive (15).

3. A battery module structure with a cell buffer protection function according to claim 1, characterized in that: The buffer pad (2) comprises a rubber pad (22); a clamping plate (221) is fixedly connected to the side wall of the rubber pad (22); strip grooves (23) are provided on the inner walls of both sides of the module housing (1); two extrusion plates (231) are slidably and sealably connected in the same strip groove (23); a screw rod (232) is rotatably connected in the strip groove (23); the threads at both ends of the screw rod (232) are arranged oppositely; the two extrusion plates (231) are spirally connected to the two ends of the screw rod (232); and a sliding groove (222) is provided on a side of the clamping plate (221) away from the rubber pad (22).

4. A battery module structure with a cell buffer protection function according to claim 3, characterized in that: The inner wall of the slide groove (222) is provided with a circular groove (24); the side wall of the extrusion plate (231) is provided with a clamping groove (233); a clamping block (241) is slidably and sealably connected inside the circular groove (24); the clamping block (241) is fixedly connected to the bottom of the circular groove (24) via a connecting spring (242).

5. A battery module structure with a cell buffer protection function according to claim 4, characterized in that: The upper end of the rubber pad (22) is provided with a threaded groove (25); the threaded groove (25) is internally threadedly connected to a screw rod (251); an air passage (252) is provided inside the clamping plate (221); one end of the air passage (252) is connected to the threaded groove (25), and the other end is connected to the circular groove (24).

6. A battery module structure with a cell buffer protection function according to claim 5, characterized in that: A liquid storage cavity (26) is provided inside the rubber pad (22); the liquid storage cavity (26) is wavy; a connecting plate (261) is inlaid at the lower end of the rubber pad (22); a liquid inlet hole (262) and a liquid outlet hole connected to the liquid storage cavity (26) are provided at the lower end of the connecting plate (261); a connecting port (16) is provided on the upper end surface of the liquid cooling plate (12); a sealing block (161) is slidably sealed in the connecting port (16); the sealing block (161) is connected to the inner wall of the connecting port (16) via a conical spring (162).

7. A battery module structure with a cell buffer protection function according to claim 6, characterized in that: The liquid inlet hole (262) and the liquid outlet hole are both slidably and sealingly connected with a connecting pipe (27); the connecting pipe (27) and the connecting plate (261) are connected via a supporting spring (271).

8. A battery module structure with a cell buffer protection function according to claim 7, characterized in that: One end of the clamping plate (221) away from the module end plate (11) is provided with a positioning groove (28) connected to the liquid storage chamber (26); two rubber pads (22) are provided; a liquid delivery pipe (281) is provided between the two rubber pads (22); the liquid delivery pipe (281) is used to connect the positioning grooves (28) of two opposite clamping plates (221).

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