High-capacity power lithium battery module and system with good heat dissipation
Patent Information
- Application Number
- CN202422643282.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-10-31
Smart Images
Figure CN223462360U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery module technical field, especially a large capacity power lithium battery module and system of good heat dissipation. BACKGROUND
[0002] Square aluminum shell battery is reliable, energy efficiency is high, relative weight is light, structure is relatively simple, and expansion is relatively convenient, and in specific use, can be combined through series connection or parallel connection, and then further assembled and fixed to form a battery pack. In the prior art, the battery pack of this type generally has the disadvantage of inconvenient disassembly. The reason why it is inconvenient to disassemble is largely related to the connection mode between the cell poles. At present, the connection between the poles of each cell in the square aluminum shell battery module is generally realized by pressing, ultrasonic welding, laser welding and other modes through a special metal connecting piece. This connection is stable and reliable, which helps to ensure the conductivity and mechanical strength of the connection. However, this connection mode has the following problems: poor welding consistency, welding success rate cannot be guaranteed, not easy to detect, if there is poor welding, it is difficult to repair, and the welding process is complex and the production efficiency is low; the place where the welding is not firm may be cracked under the influence of external forces such as use scene vibration, resulting in interruption of the connection; low disassembly efficiency, improper operation may cause short circuit, liquid leakage and other safety problems. More attention should be paid to the fact that this connection mode leads to the vertical placement of the cell, the small face of the cell is attached to the cooling plate, and the small contact area is easy to cause the accumulation of heat when the cell is discharged at a large rate, the temperature difference between the top and bottom of the cell is large, and the heat dissipation performance of the whole module is poor. Poor heat dissipation performance will have many adverse effects on the comprehensive performance of the battery performance, safety, service life and the like. Therefore, when designing and using the lithium battery module, attention must be paid to the heat dissipation problem, and effective heat dissipation measures must be taken to ensure that the battery module operates within the appropriate temperature range.
[0003] Therefore, the present application is proposed. UTILITY MODEL CONTENTS
[0004] In view of the above-mentioned shortcomings of the prior art, the utility model provides a large capacity power lithium battery module with good heat dissipation.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the main technical scheme including:
[0006] On the one hand, the utility model provides a large capacity power lithium battery module with good heat dissipation, which comprises: a battery pack composed of a plurality of square aluminum shell cells connected in series, each square aluminum shell cell has positive and negative poles located on the side of the battery pack with the large face facing down, adjacent square aluminum shell cells are separated by an insulating piece and the positive and negative poles are connected by a conductive connecting piece, and the upper surface and the lower surface of the battery pack are respectively provided with a liquid cooling plate, and the two liquid cooling plates are fixedly connected.
[0007] The conductive connecting piece comprises a main connecting pipe, a secondary connecting pipe, a limiting piece, a spring, a probe mounting sleeve and a probe, the two secondary connecting pipes are vertically and fixedly connected with two ends of the main connecting pipe respectively, the limiting piece is fixed on the secondary connecting pipe, the probe is slidably connected with the free end of the secondary connecting pipe through the probe mounting sleeve, the spring is sleeved on the part of the secondary connecting pipe between the limiting piece and the probe mounting sleeve, and the main connecting pipe and the secondary connecting pipe are both hollow structures capable of conducting electricity.
[0008] Preferably, the probe comprises a probe body and a contact tooth, the contact tooth is located on the end face of the free end of the probe body and is recessed inward relative to the end face.
[0009] Preferably, the main connecting pipe and the secondary connecting pipe are respectively provided with a grouting hole for injecting conductive silver paste into the main connecting pipe and the secondary connecting pipe.
[0010] Preferably, the contact tooth is selected from any one or more of a rectangular tooth, a spherical tooth, a conical tooth, a wavy tooth and a sawtooth.
[0011] Preferably, the probe is welded, riveted or integrally formed with the probe mounting sleeve, and the probe body and the contact tooth are integrally formed.
[0012] Preferably, the contact resistance of the contact tooth is less than 10 mΩ, and the elastic force of the spring is greater than 300 Kg.
[0013] Preferably, the insulating piece is an elastic insulating partition plate adhered to the square aluminum shell battery cell, and the elastic insulating partition plate is adhered to the side of the square aluminum shell battery cell close to the outer periphery.
[0014] Preferably, the limiting piece is selected from one of a limiting ring, a clamping spring, a limiting pin and a limiting bolt.
[0015] In another aspect, the utility model also provides a large-capacity power lithium battery system with good heat dissipation, which comprises at least one large-capacity power lithium battery module.
[0016] Preferably, the utility model further comprises a shell and a cover plate, the inner surface of the cover plate is provided with a positioning groove, and the positioning groove is used for pressing the main connecting pipe of each conductive connecting piece after the cover plate is fixedly connected with the shell.
[0017] Compared with the prior art, the utility model has at least the following beneficial effects:
[0018] 1. The square aluminum shell battery cell is placed horizontally by the conductive connecting piece, and the large surface of the square aluminum shell battery cell contacts the liquid cooling plate, so that the heat dissipation area is significantly increased, and the heat dissipation performance of the battery module is effectively improved, and the improvement of the heat dissipation performance helps to improve the comprehensive performance of the lithium battery module.
[0019] 2. Conductive connectors are weld-free, thus avoiding the shortcomings of traditional welding, such as poor consistency, cold welding, cumbersome operation, and low production efficiency. They can also be disassembled and replaced at any time. On the one hand, this helps meet the requirements of battery module recycling. On the other hand, when the battery pack is retired and disassembled, manual disassembly is efficient and less likely to cause safety issues such as short circuits and leakage.
[0020] 3. The conductive connector is elastically connected to the pole, which can adapt to a certain vibration force. Even if there is external force such as vibration in the use scenario, the connection will not loosen or break, which is stable and reliable.
[0021] 4. The number of square aluminum shell battery cells is reliable, so the utility model has a wide range of applications, strong practicality and good performance. It can provide emergency supplementary power for new energy vehicles and also provide power for ordinary household appliances. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0023] Figure 1 It is a structural diagram of the utility model;
[0024] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at A in the middle;
[0025] Figure 3 for Figure 1 Exploded diagram;
[0026] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at B in the middle;
[0027] Figure 5 for Figure 1 and Figure 3 Schematic diagram of the structure of the conductive connector;
[0028] Figure 6 for Figure 5 Schematic diagram of the probe structure.
[0029] In the figure: 1. Liquid cooling plate; 11. Connection hole; 2. Square aluminum shell battery cell; 3. Conductive connector; 31. Main connecting pipe; 32. Secondary connecting pipe; 321. Grouting hole; 33. Limiting piece; 34. Spring; 35. Probe mounting sleeve; 36. Probe; 361. Probe body; 362. Contact tooth; 4. Connecting rod; 5. Cover plate; 51. Positioning groove; 6. Shell. DETAILED DESCRIPTION
[0030] 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. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0031] The structures not described in detail in the following embodiments are prior art, and the orientation words such as "left end", "right end" and the like used for clearly describing the relative position relationship of components do not limit the protection scope of the utility model, and the "sliding connection", "fixed connection" and the like used for clearly describing the connection relationship between components all adopt the prior art and the conventional technical means in the field, and are not the improvements of the present application.
[0032] As shown in Figure 1 , Figure 2 , Figure 5 , Figure 6 The utility model provides a good heat dissipation high capacity power lithium battery module, include: by a plurality of square aluminum shell electric core 2 series connection and become battery group, every square aluminum shell electric core 2 big face is down and makes that positive and negative pole are all located the side of battery group, adjacent square aluminum shell electric core 2 between through an insulating part is kept apart and positive and negative pole is connected through conductive connecting piece 3, the upper surface and the lower surface of battery group are provided with a liquid cooling plate 1 respectively, and two liquid cooling plates 1 are fixedly connected between the two liquid cooling plates 1.
[0033] Conductive connecting piece 3 includes: main connecting pipe 31, vice connecting pipe 32, limiting piece 33, spring 34, probe mounting sleeve 35 and probe 36, two vice connecting pipes 32 are perpendicular and fixedly connected with both ends of main connecting pipe 31, limiting piece 33 is fixed on vice connecting pipe 32, probe 36 is slidably connected with the free end of vice connecting pipe 32 through probe mounting sleeve 35, spring 34 is sleeved on the part of vice connecting pipe 32 between limiting piece 33 and probe mounting sleeve 35, main connecting pipe 31 and vice connecting pipe 32 are all hollow structures that can conduct electricity, and the size specifications of the two are preferably the same.
[0034] Working principle: a plurality of square aluminum shell electric core 2 lies flat and is placed on a liquid cooling plate 1, and another liquid cooling plate 1 is placed on the upper surface, and the two liquid cooling plates 1 are fixedly connected to fix the square aluminum shell electric core 2, and the positive and negative poles between the adjacent two square aluminum shell electric cores 2 are electrically connected through the conductive connecting piece 3, specifically: one probe 36 of the conductive connecting piece 3 contacts the positive pole of one square aluminum shell electric core 2, and the other probe 36 contacts the negative pole of the adjacent other square aluminum shell electric core 2.
[0035] It should be noted that:
[0036] (1) The capacity of the square aluminum shell battery cell 2 can be flexibly selected, and 100 Ah-300 Ah can be selected. The specific number can also be flexibly selected according to the needs, and 4-8 is appropriate.
[0037] (2) The liquid cooling plate 1 is a prior art, which is provided with a liquid cooling flow channel, which is designed to be tightly attached to the upper surface and the lower surface of the battery pack. Two liquid cooling plates 1 are fixedly connected, such as Figure 2 As shown: The liquid cooling plate 1 is provided with a connecting hole 11 at the four corners, and the two connecting holes 11 opposite to each other between the two liquid cooling plates 1 are fixedly connected through the connecting rod 4.
[0038] Further, the probe 36 includes a probe body 361 and a contact tooth 362, and the contact tooth 362 is located on the end face of the free end of the probe body 361 and is recessed inward relative to the end face.
[0039] In this embodiment, the contact tooth 362 is not too small or too large in the degree of inward recess, such as too large in the degree of inward recess, which will cause the contact tooth 362 to be unstable or even unable to contact the pole, which is not conducive to the stability of the connection, such as too small in the degree of inward recess, the clamping effect of the probe body 361 on the pole is not obvious, and the connection will be loose when there is vibration in the use scene. Generally, the depth of the wrapping cavity formed by the recess of the contact tooth 362 is 1 / 3-1 / 2 of the height of the pole, which is appropriate within this range, which can realize stable connection and also does not affect the elastic range of the conductive connecting piece 3, and ensures that the use demand under the scene with vibration is met.
[0040] Further, the main connecting pipe 31 and the auxiliary connecting pipe 32 are respectively provided with a grouting hole for injecting conductive silver paste into them, such as the auxiliary connecting pipe 32 being provided with a grouting hole 321 with a diameter of not more than 2mm.
[0041] The silver paste is injected into the main connecting pipe 31 and the auxiliary connecting pipe 32, which can enhance the conductivity on the one hand, and on the other hand, in order to fill the hollow caused by the inconsistent compression amount of the spring 34, to ensure the stability and reliability of the electrical connection, and further to enhance the mechanical strength of the connection, to prevent the connection from failing due to vibration or impact.
[0042] Further, the contact tooth 362 is selected from any one or more of a rectangular tooth, a spherical tooth, a conical tooth, a wave-shaped tooth, and a saw-shaped tooth. The contact tooth of the above structure can ensure stable contact between the probe and the positive and negative poles to be connected to achieve firm electrical connection.
[0043] Further, the probe 36 is welded, riveted or integrally formed with the probe mounting sleeve 35, and the probe body 361 and the contact tooth 362 are integrally formed. The material of the above-mentioned parts can be copper, and is preferably gold-plated brass.
[0044] Further, the contact resistance of the contact tooth 362 is less than 10 mΩ, and the elastic force of the spring 34 is greater than 300 Kg. If the contact resistance of the contact tooth 362 is too large, the electrical connection effect will be affected, and if the elastic force of the spring 34 is too small, the electrical connection effect will also be affected, and the probe 36 cannot be firmly contacted with the pole in the use scene with vibration, so the stability of the connection cannot be guaranteed.
[0045] Further, the insulating piece is an elastic insulating partition plate attached to the square aluminum shell battery cell 2, and the elastic insulating partition plate is attached to the side of the square aluminum shell battery cell 2 near the outer periphery. For example, the elastic insulating partition plate can be a flame-retardant foam board with a certain thickness. On the one hand, it can separate the square aluminum shell battery cells 2 from each other, so that the adjacent square aluminum shell battery cells 2 do not directly contact each other, avoiding mutual interference, so that even if one battery cell has a problem, it will not affect the normal use of the adjacent battery cell. On the other hand, it can also provide space for the battery cell to expand, thereby increasing the service life of the battery cell.
[0046] Further, the limiting piece 33 is selected from one of a limiting ring, a clamping spring, a limiting pin, and a limiting bolt. Of course, other structures that can play a limiting role in the prior art can also be used as limiting pieces.
[0047] As Figure 3 , Figure 4 It is collectively shown that the utility model also provides a high-capacity power lithium battery system with good heat dissipation, which comprises a group of high-capacity power lithium battery modules, a shell 6 and a cover plate 5, the inner surface of the cover plate 5 is provided with a positioning groove 51, and the cover plate 5 is fixedly connected with the shell 6, and the positioning groove 51 is used for pressing the main connecting pipe 31 of each conductive connecting piece 3.
[0048] Specifically, the above-mentioned high-capacity power lithium battery system is also provided with an inverter, a BMS protection plate and other necessary structures. These structures are all prior art, and the connection mode is also prior art, so they will not be described again. The cover plate 5 is provided with a charging socket, a discharging socket and other necessary structures. These structures are all prior art, and the design method is also prior art, so they will not be described again.
[0049] It should be noted that:
[0050] (1) The high-capacity power lithium battery system can also include two groups and more than two groups of high-capacity power lithium battery modules. At this time, it is not necessary to repeatedly design the liquid cooling plate, and only the battery group in which a plurality of square aluminum shell battery cells are connected in series is stacked in the form of one layer of liquid cooling plate, one layer of battery group, another layer of liquid cooling plate, and another layer of battery group, so that the upper surface and the lower surface of each battery group are provided with a liquid cooling plate.
[0051] (2) The lithium battery system shown in the utility model is only an exemplary embodiment of the lithium battery module, and is not used to limit the lithium battery module, and other lithium battery systems formed by improving the shell and the cover plate also belong to the protection scope of the utility model.
[0052] In conclusion: the utility model discloses a unique structure of the conductive connecting piece realizes square aluminum shell electric core lying and forms module, and the large surface of square aluminum shell electric core contacts with the liquid cooling plate, and compared with the existing vertical placement, the heat dissipation area is increased significantly, so the heat dissipation effect is better, and the conductive connecting piece is used for pole connection and exempts from welding, so the consistency of traditional welding is avoided, and the problems such as virtual welding, complicated operation, low production efficiency, high integrated cost and the like are avoided, not only stable connection, but also can adapt to the use scene of vibration, and the use can also meet the requirement of battery module gradient utilization, and the whole lithium battery module is convenient to disassemble and is not easy to appear safety problem.
[0053] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and cannot be understood as the limitation of the utility model, and the ordinary skilled in the art can change, modify, replace and deform the above-mentioned embodiments within the scope of the utility model.In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without mutual contradiction.
Claims
1. A large capacity power lithium battery module with good heat dissipation, characterized in that, The application relates to a large-capacity power lithium battery module. The conductive connecting piece (3) comprises a main connecting pipe (31), a secondary connecting pipe (32), a limiting piece (33), a spring (34), a probe mounting sleeve (35) and a probe (36), the two secondary connecting pipes (32) are vertically and fixedly connected with two ends of the main connecting pipe (31), the limiting piece (33) is fixed on the secondary connecting pipe (32), the probe (36) is slidably connected with the free end of the secondary connecting pipe (32) through the probe mounting sleeve (35), the spring (34) is sleeved on the part of the secondary connecting pipe (32) between the limiting piece (33) and the probe mounting sleeve (35), and the main connecting pipe (31) and the secondary connecting pipe (32) are hollow structures capable of conducting electricity. The probe (36) comprises a probe body (361) and a contact tooth (362), and the contact tooth (362) is located on the end face of the free end of the probe body (361) and is recessed inward relative to the end face.
2. The high capacity power lithium battery module with good heat dissipation according to claim 1, characterized in that, The main connecting pipe (31) and the secondary connecting pipe (32) are respectively provided with grouting holes for injecting conductive silver paste into the pipes.
3. The high capacity power lithium battery module with good heat dissipation of claim 1, wherein, The contact tooth (362) is selected from any one or more of a rectangular tooth, a spherical tooth, a conical tooth, a wavy tooth and a saw-shaped tooth.
4. The high capacity power lithium battery module with good heat dissipation of claim 2, wherein, The probe (36) is welded, riveted or integrally formed with the probe mounting sleeve (35), and the probe body (361) and the contact tooth (362) are integrally formed.
5. The high capacity power lithium battery module with good heat dissipation according to claim 4, characterized in that, The contact resistance of the contact tooth (362) is less than 10 m omega, and the elastic force of the spring (34) is greater than 300 Kg.
6. The high power lithium battery module with good heat dissipation according to claim 2, characterized in that, The limiting piece (33) is selected from one of a limiting ring, a clamping spring, a limiting pin and a limiting bolt.
7. The high power lithium battery module with good heat dissipation of claim 1, wherein, The application further relates to a large-capacity power lithium battery module.
8. The high power lithium battery module with good heat dissipation of claim 1, wherein, The application further relates to a large-capacity power lithium battery module.
9. A high capacity power lithium battery system with good heat dissipation, characterized in that, The inner surface of the cover plate (5) is provided with a positioning groove (51), and the main connecting pipe (31) of each conductive connecting piece (3) is compressed by the positioning groove (51) after the cover plate (5) is fixedly connected with the shell (6).
10. The high capacity power lithium battery system with good heat dissipation of claim 9, wherein,