Battery and electric device

Abstract

The invention discloses a battery and a power utilization device. The battery comprises a heat exchange top plate and a plurality of battery monomers, each single battery comprises a battery cell, and an anti-explosion valve and two poles which are respectively arranged at the top of the battery cell; the heat exchange top plate is arranged at the tops of the battery monomers, a heat exchange flow channel is formed in the heat exchange top plate and comprises at least one first flow channel and at least one second flow channel, the first flow channel corresponds to pole columns of the battery monomers, and the second flow channel corresponds to anti-explosion valves of the battery monomers; the heat exchange top plate is provided with at least one through pressure relief hole at the position avoiding the first flow channel and the second flow channel. The method mainly solves the technical problems of how to reduce the risk of thermal runaway of the battery and how to effectively inhibit the thermal runaway phenomenon when the thermal runaway of the battery occurs.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery and an electrical device using the same. Background Art

[0002] As a functional component commonly used in batteries, the heat exchange top plate plays a role in cooling multiple battery cells. However, when the operating temperature of a battery cell exceeds the safety valve threshold range, thermal runaway of the battery cell will occur. Thermal runaway of one battery cell usually triggers a chain reaction of thermal runaway in the remaining battery cells. The heat exchange top plate that only serves to cool the battery cells cannot meet the requirement of suppressing the thermal spread phenomenon. Therefore, how to reduce the risk of thermal runaway of the battery and how to effectively suppress thermal runaway when it occurs are technical problems for high-safety-demand batteries at present. Summary of the Invention

[0003] The purpose of the present invention is to provide a battery and an electrical device using the same, mainly to solve the technical problems of how to reduce the risk of thermal runaway of the battery and how to effectively suppress thermal runaway when it occurs.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A battery, comprising a heat exchange top plate and a plurality of battery cells;

[0006] Each of the battery cells includes an electric core, an explosion-proof valve and two electrode terminals respectively arranged on the top of the electric core;

[0007] The heat exchange top plate is arranged on the top of the plurality of battery cells. The heat exchange top plate has a heat exchange flow channel therein. The heat exchange flow channel includes at least one first flow channel and at least one second flow channel. The first flow channel corresponds to the electrode terminals of the plurality of battery cells, and the second flow channel corresponds to the explosion-proof valves of the plurality of battery cells. At least one through pressure relief hole is arranged at positions where the heat exchange top plate respectively avoids the first flow channel and the second flow channel.

[0008] In one of the technical solutions, pressure relief holes are arranged on both opposite sides of the second flow channel in the width direction, so that the pressure relief holes are arranged on one side of the explosion-proof valves of the plurality of battery cells.

[0009] In one of the technical solutions, in one of the battery cells, two of the electrode terminals are arranged on the top of the electric core, one of the electrode terminals serves as the positive electrode, and the other serves as the negative electrode. The explosion-proof valve is arranged on the top of the electric core and between the two electrode terminals.

[0010] The heat exchange flow channel includes at least one heat exchange area, and the heat exchange area includes two first flow channels and a second flow channel located between the two first flow channels;

[0011] In one heat exchange area, pressure relief holes are provided between each of the two first flow channels and the second flow channel.

[0012] In one technical solution, the heat exchange flow channel includes a liquid inlet main path, a liquid outlet main path, and at least two heat exchange branch paths;

[0013] Each heat exchange branch path is respectively communicated with the liquid inlet main path and the liquid outlet main path, and the heat exchange branch path includes at least one heat exchange area;

[0014] When the heat exchange branch path includes multiple heat exchange areas, the multiple heat exchange areas in the heat exchange branch path are connected in series in sequence;

[0015] Among multiple heat exchange branch paths, a throttle orifice is provided between the heat exchange branch path closest to the liquid inlet end of the liquid inlet main path and the liquid inlet main path, and the space for the heat exchange branch path farther away from the liquid inlet end of the liquid inlet main path to communicate with the liquid inlet main path is larger.

[0016] In one technical solution, the battery further includes a box body and a box cover. An outwardly open receiving groove is provided in the box body, and a plurality of battery monomers and the heat exchange top plate are both accommodated in the receiving groove. The box cover is connected to the box body and covers the notch of the receiving groove.

[0017] In one technical solution, the box body includes a cross beam provided in the receiving groove, and the height of the cross beam is lower than the top surface of the battery cell, so as to form an exhaust passage between the cross beam and the heat exchange top plate.

[0018] In one technical solution, the battery further includes a fastener and a support frame;

[0019] The cross beam is provided in the middle area of the receiving groove, and a plurality of battery monomers are arranged on both opposite sides of the cross beam. A through hole is provided in the middle area of the heat exchange top plate, and the first flow channel, the second flow channel, and the pressure relief hole are provided on both opposite sides of the through hole;

[0020] The fastener passes through the through hole and extends into the exhaust passage and is fixedly connected to the cross beam. The fastener applies pressure to the heat exchange top plate in a direction close to the cross beam, and the heat exchange top plate is in contact with the pole columns of a plurality of battery monomers directly or indirectly under the action of the pressure;

[0021] The support frame is located in the exhaust passage and fixedly connected to the cross beam. The support frame is elastic, and the top surface of the support frame directly or indirectly abuts against the bottom surface of the heat exchange top plate.

[0022] In one of the technical solutions, the support frame includes a first fixing portion, a first extending portion, a supporting portion, a second extending portion, and a second fixing portion that are connected in sequence;

[0023] Both the first fixing portion and the second fixing portion are fixedly connected to the cross beam. The first extending portion is bent upward relative to the first fixing portion, the second extending portion is bent upward relative to the second fixing portion, and the top surface of the supporting portion directly or indirectly abuts against the bottom surface of the heat exchange top plate.

[0024] In one of the technical solutions, the fastener includes an expansion nut and a first bolt. A part of the expansion nut is located in the exhaust passage and fixedly connected to the cross beam. The first bolt passes through the box cover and is connected to the expansion nut. The expansion nut expands under the connection of the first bolt and applies the pressure to the heat exchange top plate in the direction close to the cross beam, and the first bolt and the expansion nut jointly clamp the box cover.

[0025] In one of the technical solutions, the box body includes a frame and a bottom guard plate connected to the bottom of the frame. The frame and the bottom guard plate jointly enclose to form the receiving groove, and the cross beam is connected to the frame;

[0026] The battery further includes a heat exchange bottom plate placed in the receiving groove, and the heat exchange bottom plate is arranged at the bottoms of a plurality of battery cells;

[0027] The fastener further includes a second bolt. The second bolt sequentially passes through the bottom guard plate, the heat exchange bottom plate, and the cross beam and is connected to the expansion nut. The expansion nut expands under the connection of the second bolt and jointly clamps the heat exchange bottom plate with the bottom surface of the cross beam, and the second bolt and the expansion nut jointly clamp the bottom guard plate.

[0028] An electric device includes the battery according to any one of the above.

[0029] Compared with the prior art, the battery provided by the present invention has at least the following beneficial effects:

[0030] The heat exchange top plate of this solution is designed with a first flow channel and a second flow channel. Among them, the first flow channel is specifically used to cool the pole columns of multiple battery cells. By cooling the pole columns, the risk of thermal runaway of the battery cells is reduced, enabling the battery cells to operate within an appropriate temperature range, which is beneficial to extending the service life of the battery cells. Among them, the second flow channel is opposite to the explosion-proof valves of multiple battery cells. When a relatively serious thermal runaway occurs in the battery cells, it can break through the heat exchange top plate, causing the coolant in the second flow channel to pour outwards and pour onto the battery cells with thermal runaway, thereby suppressing the spread of the thermal runaway phenomenon and improving the safety of the battery. At the same time, the pressure relief holes provided on the heat exchange top plate ensure that the explosion-proof valves can exhaust gas in time on the one hand, further reducing the risk of the spread of thermal runaway, and on the other hand, also reducing the structural strength of the heat exchange top plate, which is beneficial for the battery cells with thermal runaway to break through a corresponding second flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 Structural schematic diagram of a battery provided by an embodiment of the present application;

[0033] Figure 2 For Figure 1 Exploded view of the structure of the battery shown;

[0034] Figure 3 Structural schematic diagram of the heat exchange top plate and multiple battery cells provided by an embodiment of the present application;

[0035] Figure 4 For Figure 3 Local enlarged view at C in

[0036] Figure 5 And Figure 6 Both are plan views of the heat exchange top plate provided by an embodiment of the present application;

[0037] Figure 7 Exploded view of the structure of the heat exchange top plate provided by an embodiment of the present application;

[0038] Figure 8 For Figure 1 Cross-sectional view of the battery shown;

[0039] Figure 9 For Figure 8 Local enlarged view at A in

[0040] Figure 10 is Figure 8 the partial enlarged view of B in

[0041] Among them, the reference numerals in the figure are as follows:

[0042] 1. Box body; 11. Receiving groove; 12. Frame; 13. Cross beam; 14. Exhaust passage; 15. Bottom guard plate;

[0043] 2. Heat exchange top plate; 21. Flow channel plate; 211. First hole position; 22. Flat plate; 221. Liquid inlet hole; 222. Liquid outlet hole; 223. Second hole position; 23. Heat exchange flow channel; 231. First flow channel; 232. Second flow channel; 233. Liquid inlet main path; 234. Liquid outlet main path; 235. Heat exchange branch path; 24. Pressure relief hole; 25. Heat exchange area; 26. Reinforcing strip; 27. Through hole;

[0044] 3. Battery cell; 31. Battery core; 32. Terminal post; 33. Explosion-proof valve; 4. Box cover;

[0045] 5. Fastener; 51. Expansion nut; 52. First bolt; 53. Second bolt;

[0046] 6. Support frame; 61. First fixing part; 62. First extension part; 63. Support part; 64. Second extension part; 65. Second fixing part; 7. Heat exchange bottom plate. Specific embodiments

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0048] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0049] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0050] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0051] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0052] Please refer to Figures 1 to 5 , this embodiment provides a battery, including a box body 1, a heat exchange top plate 2 and a plurality of battery cells 3. Among them, an outwardly open receiving groove 11 is provided in the box body 1, and the heat exchange top plate 2 and all the battery cells 3 are accommodated in the receiving groove 11; among them, the battery cell 3 includes a battery core 31, a pole column 32 and an explosion-proof valve 33, and the explosion-proof valve 33 and at least one pole column 32 are arranged at the top of the battery core 31. Among them, the heat exchange top plate 2 is arranged on the top of the plurality of battery cells 3, and the heat exchange top plate 2 is in direct contact with the pole columns 32 at the tops of the plurality of battery cells 3 at the same time, or the heat exchange top plate 2 exchanges heat with the pole columns 32 at the tops of the plurality of battery cells 3 through a heat-conducting adhesive or a heat-conducting pad at the same time. Since the pole column 32 is a metal conductive part, the temperature of the pole column 32 on the battery cell 3 is usually higher than the temperature of the outer wall of the battery core 31. Therefore, cooling the pole column 32 by the heat exchange top plate 2 can improve the efficiency of cooling the battery cell 3. Preferably, the explosion-proof valve 33 and two pole columns 32 on the battery cell 3 are both arranged at the top position, one of the pole columns 32 is used as the positive electrode, and the other pole column 32 is used as the negative electrode. The two pole columns 32 at the top of each battery cell 3 exchange heat with the heat exchange top plate 2 to further improve the cooling efficiency of the plurality of battery cells 3 and reduce the risk of the battery experiencing thermal runaway.

[0053] Please refer to Figure 5 and Figure 7 , the heat exchange top plate 2 includes a flow channel plate 21 and a flat plate 22. The flow channel plate 21 and the flat plate 22 are preferably made of three-series or six-series aluminum alloy. The thicknesses of the flow channel plate 21 and the flat plate 22 are preferably 1 mm - 2 mm. The flow channel plate 21 is formed into a heat exchange flow channel 23 by stamping, and the stamping depth of the flow channel plate 21 is 3 mm - 4 mm. The flat plate 22 and the flow channel plate 21 are welded to seal the heat exchange flow channel 23, so that the heat exchange flow channel 23 can be in accordance with Figure 5The path indicated by the thick arrow is for the coolant to flow, wherein the flat plate 22 is provided with a penetrating liquid inlet hole 221 and a liquid outlet hole 222. When the flat plate 22 and the flow channel plate 21 are welded to each other, the liquid inlet hole 221 and the liquid outlet hole 222 will be connected to the heat exchange flow channel 23 respectively. The liquid inlet hole 221 is used for external coolant to enter the heat exchange flow channel 23, and the liquid outlet hole 222 is used for the coolant in the heat exchange flow channel 23 to be discharged outward.

[0054] Specifically, Figure 3 and Figure 5 As shown, the heat exchange channel 23 includes at least one first channel 231 and at least one second channel 232, wherein the first channel 231 is used to correspond to the poles 32 of multiple battery cells 3, and the first channel 231 is used to efficiently cool down multiple battery cells at the same time. The outer wall of the heat exchange top plate 2 at the first channel 231 can be in direct contact with the poles 32 of multiple battery cells 3, and the outer wall of the heat exchange top plate 2 at the first channel 231 can also indirectly conduct heat to the poles 32 of multiple battery cells 3 through a thermal pad or thermally conductive glue. Among them, the second channel 232 is used to correspond to the explosion-proof valves 33 of multiple battery cells 3. In addition, the heat exchange top plate 2 is provided with at least one through pressure relief hole 24 at positions that avoid the first channel 231 and the second channel 232 respectively. In fact, as Figure 7 As shown, the flow channel plate 21 is provided with at least one first through hole 211, and the flat plate 22 is provided with at least one second through hole 223 at a position at least partially overlapping with the first hole 211. The first hole 211 and the second hole 223 together constitute the above-mentioned pressure relief hole 24.

[0055] Specifically, the first flow channel 231 provided on the heat exchange top plate 2 of the present solution is specifically used to cool the poles 32 of multiple battery cells 3. By cooling the poles 32, the risk of thermal runaway of the battery cells 3 is reduced, so that the battery cells 3 work within a suitable temperature range, which is conducive to extending the service life of the battery cells 3; the second flow channel 232 provided on the heat exchange top plate 2 of the present solution corresponds to the explosion-proof valves 33 of multiple battery cells 3. When a battery cell 3 has a relatively serious thermal runaway phenomenon, it can break through the heat exchange top plate 2, so that the coolant in the second flow channel 232 pours out and pours onto the battery cell 3 that has thermal runaway, thereby suppressing the spread of the thermal runaway phenomenon and improving the safety of the battery. At the same time, the pressure relief hole 24 provided on the heat exchange top plate 2 ensures that the explosion-proof valve 33 can exhaust air to the outside in time, further reducing the risk of thermal runaway spreading, and on the other hand, it also reduces the structural strength of the heat exchange top plate 2, thereby facilitating the battery cell 3 that has thermal runaway to break through a corresponding second flow channel 232.

[0056] Please refer again Figure 5, pressure relief holes 24 are provided on both opposite sides of the second flow channel 232 in the width direction. Through such a design, the pressure relief holes 24 are arranged on one side of the explosion-proof valves 33 of multiple battery cells 3, which is beneficial for the explosion-proof valves 33 to discharge gas in time, avoid excessive air pressure that may easily cause thermal runaway, and make the structural strength of the heat exchange top plate 2 in the area around the second flow channel 232 relatively low, thereby improving the reliability of being able to break through the second flow channel 232 when a relatively serious thermal runaway occurs. In other embodiments, a weak part may also be provided on the side of the heat exchange top plate 2 facing the battery cells 3 and corresponding to the outer wall of the second flow channel 232. When the thermal runaway occurs, the weak part is fractured under force, and at this time, the coolant in the second flow channel 232 can more easily pour down onto the corresponding explosion-proof valve 33, and the further spread of the thermal runaway phenomenon is inhibited.

[0057] Optionally, as Figure 5 shown, when the length of the pressure relief hole 24 is too long and the structural strength of the heat exchange top plate 2 is too low, some reinforcing strips 26 can be provided at the middle position of the pressure relief hole 24.

[0058] Please refer to Figures 4 to 6 together. At least one heat exchange area 25 is provided on the heat exchange top plate 2. The heat exchange area 25 includes two of the above-mentioned first flow channels 231 and a second flow channel 232 located between the two first flow channels 231. Through such a design, the heat exchange top plate 2 can meet the heat dissipation requirements of Figure 4 shown in a row of battery cells 3. Specifically, each heat exchange area 25 corresponds to a row of battery cells 3, Figure 4 shown, the explosion-proof valves 33 of the respective battery cells 3 are arranged between two pole posts 32. In addition, in each heat exchange area 25, a row of the above-mentioned pressure relief holes 24 is provided between each of the two first flow channels 231 and the second flow channel 232 respectively, so as to achieve the purpose of having pressure relief holes 24 provided on both opposite sides of the second flow channel 232 in the width direction.

[0059] Please refer to Figure 5 and Figure 6 together again. The heat exchange flow channel 23 specifically includes a liquid inlet main path 233, a liquid outlet main path 234 and at least two heat exchange branch paths 235. Among them, all the heat exchange branch paths 235 are respectively communicated with the liquid inlet main path 233 and the liquid outlet main path 234. The liquid inlet main path 233 is used for diverting the coolant into each heat exchange branch path 235, and the liquid outlet main path 234 is used for discharging the coolant in each heat exchange branch path 235 after confluence. By providing multiple parallel heat exchange branch paths 235, the uniformity of cooling multiple battery cells 3 can be improved, that is, the temperature uniformity of multiple battery cells 3 is improved. In this embodiment, preferably, the heat exchange branch paths 235 are Figure 6 shown and have two. As Figure 6As shown, the heat exchange branch 235 includes at least one of the above-mentioned heat exchange areas 25. When the heat exchange branch 235 includes multiple heat exchange areas 25, the multiple heat exchange areas 25 in the heat exchange branch 235 are connected in series in sequence. Preferably in this embodiment, the heat exchange branch 235 includes two of the above-mentioned heat exchange areas 25, that is, one heat exchange branch 235, such as Figure 3 shown, cools two columns of battery cells 3 simultaneously, and two heat exchange branches 235, such as Figure 3 shown, jointly cool four columns of battery cells 3.

[0060] Optionally, please refer to Figure 6 . A throttle orifice is provided between the closest heat exchange branch 235 to the liquid inlet end of the main liquid inlet path 233 and the main liquid inlet path 233 (i.e., at location A). Among multiple heat exchange branches 235, the space for the heat exchange branch 235 farther from the liquid inlet end of the main liquid inlet path 233 to communicate with the main liquid inlet path 233 is larger. Here, please refer to Figure 6 and understand that in Figure 6 , the space for the coolant to flow into a corresponding heat exchange branch 235 from point B is larger than the space for the coolant to flow into a corresponding heat exchange branch 235 from point A, making the flow rate differences among the heat exchange branches 235 smaller, thereby further improving the temperature uniformity of the multiple battery cells 3 after cooling and avoiding the phenomenon that the temperature of local battery cells 3 is still relatively high and prone to thermal runaway.

[0061] Please refer back to Figure 1 and Figure 2 . Since the heat exchange top plate 2 has a relatively large number of pressure relief holes 24 opened, the structural strength of the heat exchange top plate 2 is relatively low. Moreover, in this application, it is necessary to utilize the low structural strength of the heat exchange top plate 2 to enable the coolant in the second flow channel 232 to pour onto the corresponding explosion-proof valve 33 to achieve the purpose of suppressing the spread of the thermal runaway phenomenon. In this regard, based on the structural design with a relatively low structural strength of the heat exchange top plate 2 in this solution, the battery in this embodiment further includes a box cover 4. The box cover 4 is connected to the box body 1 and covers the open notch of the receiving groove 11, so that the heat exchange top plate 2 and the multiple battery cells 3 can be located in the receiving groove 11 and be better protected.

[0062] Please refer to Figure 8 and Figure 9 . The box body 1 includes a cross beam 13 disposed in the receiving groove 11. The height of the cross beam 13 is lower than the top surface of the battery core 31, forming an exhaust channel 14 between the cross beam 13 and the heat exchange top plate 2. When a thermal runaway occurs in the battery cell 3, the discharged gas can be discharged into the exhaust channel 14. The exhaust channel 14 can accommodate a certain amount of gas, so it can buffer the gas discharged from the battery cell 3 to solve the problem of too rapid increase in the internal pressure of the battery and ensure high safety of the battery.

[0063] Please refer to Figure 8 and Figure 9 , the battery further includes a fastener 5. As shown in Figure 2 , the cross beam 13 is arranged in the middle area of the receiving groove 11, that is, a plurality of battery cells 3 are arranged on both opposite sides of the cross beam 13. Correspondingly, as shown in Figure 5 or Figure 6 , the heat exchange top plate 2 is provided with a through hole 27 penetrating in the middle area, and heat exchange areas 25 are provided on both opposite sides of the through hole 27, that is, a first flow channel 231, a second flow channel 232 and a pressure relief hole 24 are provided on both opposite sides of the through hole 27. Specifically, the fastener 5 passes through the through hole 27 and extends into the exhaust passage 14. The fastener 5 is fixed on the top surface of the cross beam 13. The fastener 5 applies pressure to the heat exchange top plate 2, so that the heat exchange top plate 2 has a tendency to approach the cross beam 13, so that the heat exchange top plate 2 directly or indirectly abuts against the electrode posts 32 of a plurality of battery cells 3 on both sides of the cross beam 13 under the pressure of the fastener 5. More specifically, by arranging the cross beam 13 in the middle area, not only can the structural strength of the box body 1 be improved, but also it is beneficial to establish a more reliable fixed connection between the heat exchange top plate 2 and the box body 1, and at the same time, it is also convenient to assemble or disassemble the heat exchange top plate 2, so as to facilitate the maintenance or replacement of the plurality of battery cells 3 inside.

[0064] Please refer to Figure 8 and Figure 10 , the battery further includes a support frame 6. The support frame 6 is also located in the exhaust passage 14. Moreover, the support frame 6 is also fixedly connected to the cross beam 13. The support frame 6 has a certain elasticity. The top surface of the support frame 6 directly or indirectly abuts against the bottom surface of the heat exchange top plate 2 to support the heat exchange top plate 2 and prevent the heat exchange top plate 2 from deforming greatly under the pressure of the fastener 5, and further prevent the problem of coolant leakage of the heat exchange top plate 2 during normal operation of the battery. Preferably, the top of the support frame 6 is fixedly connected to the heat exchange top plate 2 to realize that the top surface of the support frame 6 directly or indirectly abuts against the bottom surface of the heat exchange top plate 2. By fixing the support frame 6 and the heat exchange top plate 2, the heat exchange top plate 2 will not generate large friction with the support frame 6 under the pressure of the fastener 5 during installation. In other embodiments, the support frame 6 and the heat exchange top plate 2 may not be connected, that is, the bottom surface of the heat exchange top plate 2 directly abuts against the top surface of the support frame 6.

[0065] Please refer to Figure 10, the support frame 6 specifically includes a first fixing portion 61, a first extending portion 62, a supporting portion 63, a second extending portion 64 and a second fixing portion 65 that are connected in sequence. Among them, both the first fixing portion 61 and the second fixing portion 65 are fixedly connected to the top surface of the cross beam 13. The first extending portion 62 is bent upward relative to the first fixing portion 61 and extends obliquely. The second extending portion 64 is bent upward relative to the second fixing portion 65 and also extends obliquely. The supporting portion 63 is fixedly connected to the heat exchange top plate 2, so that the top surface of the supporting portion 63 abuts against the bottom surface of the heat exchange top plate 2. With the support frame 6 having such a structure, the exhaust passage 14 will not be blocked, ensuring that there is sufficient buffer space in the exhaust passage 14.

[0066] Please refer to Figure 8 and Figure 9 , the fastener 5 includes an expansion nut 51 and a first bolt 52. A part of the expansion nut 51 is located in the exhaust passage 14. Moreover, the expansion nut 51 is fixedly connected to the cross beam 13. The first bolt 52 passes through the box cover 1 and is connected to the expansion nut 51. The expansion nut 51 expands under the connection of the first bolt 52 and applies a pressure to the heat exchange top plate 2 in the direction close to the cross beam 13, so that the bottom surface of the heat exchange top plate 2 directly or indirectly abuts against the pole columns 32 of the plurality of battery monomers 3 on both sides of the cross beam 13, thereby realizing the function that the heat exchange top plate 2 can cool down the plurality of battery monomers 3. At this time, the support frame 6 is in a deformed state under the action of the heat exchange top plate 2 to support the heat exchange top plate 2 upward. In addition, the first bolt 52 and the expansion nut 51 also clamp the box cover 4 together to solve the problem that the box cover 4 is easily deformed by external forces in the middle area.

[0067] Please refer to Figure 2 , Figure 8 and Figure 9The battery also includes a heat exchange bottom plate 7, which is arranged in the receiving groove 11 and is located at the bottom of multiple battery cells 3. The heat exchange bottom plate 7 is used to cool the bottom surface of multiple battery cells 3 at the same time. Through the mutual combination of the heat exchange bottom plate 7 and the heat exchange top plate 2, the cooling efficiency of multiple battery cells 3 can be greatly improved to further reduce the risk of thermal runaway of the battery. A flow regulating structure can be set between the heat exchange bottom plate 7 and the heat exchange top plate 2 to adjust the flow distribution of the heat exchange bottom plate 7 and the heat exchange top plate 2 to ensure that the internal temperature of multiple battery cells 3 is more uniform. In addition, the box body 1 specifically includes a frame 12 and a bottom guard plate 15. The bottom guard plate 15 is welded to the bottom of the frame 12 and is surrounded by the frame 12 to form the above-mentioned receiving groove 11. The crossbeam 13 is connected to the middle position of the frame 12. The bottom guard plate 15 is used to protect the heat exchange bottom plate 7 to avoid the heat exchange bottom plate 7 being directly exposed to the outside and easily deformed when subjected to external force, resulting in leakage, thereby ensuring that the battery has a higher safety. Based on this, the fastener 5 of this embodiment also includes a second bolt 53, which passes through the bottom guard plate 15, the heat exchange bottom plate 7 and the cross beam 13 in sequence and is finally connected to the expansion nut 51. The expansion nut 51 expands under the connection of the second bolt 53 and clamps the heat exchange bottom plate 7 together with the bottom surface of the cross beam 13, so that the heat exchange bottom plate 7 is directly or indirectly abutted against the bottom surfaces of multiple battery cells 3. Moreover, the second bolt 53 and the expansion nut 51 jointly clamp the bottom guard plate 15 to solve the problem that the bottom guard plate 15 is easily deformed due to external force in the middle area.

[0068] This paragraph provides additional explanation for the above. The fastener 5 adopts the structural design of expansion bolts, which not only provides a certain supporting strength and connection strength to the heat exchange top plate 2 and the heat exchange bottom plate 7, but also the "J"-shaped support frame 6 further provides a certain supporting strength and connection strength to the heat exchange top plate 2 and the heat exchange bottom plate 7.

[0069] This embodiment also provides an electrical device, which includes the above-mentioned battery. Therefore, the electrical device of this embodiment also has the advantage of high safety. Especially when the electrical device is a new energy vehicle, this battery can meet the high safety requirements of the new energy vehicle.

[0070] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A battery, characterized in that, It includes a heat exchange top plate (2) and a plurality of battery cells (3); The battery cell (3) includes a battery core (31), an explosion-proof valve (33) and two pole columns (32) respectively arranged on the top of the battery core (31); The heat exchange top plate (2) is arranged on the top of the plurality of battery cells (3). The heat exchange top plate (2) has a heat exchange flow channel (23) therein. The heat exchange flow channel (23) includes at least one first flow channel (231) and at least one second flow channel (232). The first flow channel (231) corresponds to the pole columns (32) of the plurality of battery cells (3), and the second flow channel (232) corresponds to the explosion-proof valves (33) of the plurality of battery cells (3). At least one through pressure relief hole (24) is arranged at the position where the heat exchange top plate (2) respectively avoids the first flow channel (231) and the second flow channel (232).

2. The battery according to claim 1, wherein, The pressure relief holes (24) are arranged on both opposite sides in the width direction of the second flow channel (232), so that the pressure relief holes (24) are arranged on one side of the explosion-proof valves (33) of the plurality of battery cells (3).

3. The battery according to claim 2, wherein Inside one battery cell (3), the explosion-proof valve (33) is arranged between the two pole columns (32); The heat exchange flow channel (23) includes at least one heat exchange area (25). One heat exchange area (25) corresponds to a row of battery cells (3). The heat exchange area (25) includes two first flow channels (231) and one second flow channel (232) located between the two first flow channels (231); Inside one heat exchange area (25), the pressure relief holes (24) are arranged between each of the two first flow channels (231) and the second flow channel (232).

4. The battery according to claim 3, wherein, The heat exchange flow channel (23) includes a liquid inlet main path (233), a liquid outlet main path (234) and at least two heat exchange branch paths (235); Each heat exchange branch path (235) is respectively communicated with the liquid inlet main path (233) and the liquid outlet main path (234). The heat exchange branch path (235) includes at least one heat exchange area (25); When the heat exchange branch path (235) includes a plurality of heat exchange areas (25), the plurality of heat exchange areas (25) in the heat exchange branch path (235) are connected in series in sequence; A throttle orifice is arranged between the heat exchange branch path (235) closest to the liquid inlet end of the liquid inlet main path (233) and the liquid inlet main path (233). Among the plurality of heat exchange branch paths (235), the space for the heat exchange branch path (235) farther away from the liquid inlet end of the liquid inlet main path (233) to communicate with the liquid inlet main path (233) is larger.

5. The battery according to claim 1, characterized in that, The battery further includes a box body (1) and a box cover (4). An outwardly open receiving groove (11) is arranged inside the box body (1). The plurality of battery cells (3) and the heat exchange top plate (2) are both accommodated in the receiving groove (11). The box cover (4) is connected to the box body (1) and covers the notch of the receiving groove (11); The box body (1) includes a cross beam (13) disposed in the receiving groove (11), and the height of the cross beam (13) is lower than the top surface of the battery cell (31), so as to form an exhaust passage (14) between the cross beam (13) and the heat exchange top plate (2).

6. The battery according to claim 5, characterized in that, The battery further includes a fastener (5) and a support frame (6); The cross beam (13) is disposed in the middle area of the receiving groove (11), and a plurality of the battery monomers (3) are arranged on both opposite sides of the cross beam (13). A through hole (27) is provided in the middle area of the heat exchange top plate (2), and a first flow channel (231), a second flow channel (232) and a pressure relief hole (24) are provided on both opposite sides of the through hole (27); The fastener (5) passes through the through hole (27) and extends into the exhaust passage (14) and is fixedly connected to the cross beam (13). The fastener (5) applies a pressure to the heat exchange top plate (2) in a direction close to the cross beam (13), and the heat exchange top plate (2) is pressed by the pressure and directly or indirectly abuts against the pole columns (32) of a plurality of the battery monomers (3) on both sides of the cross beam (13); The support frame (6) is located in the exhaust passage (14) and is fixedly connected to the cross beam (13). The support frame (6) has elasticity, and the top surface of the support frame (6) directly or indirectly abuts against the bottom surface of the heat exchange top plate (2).

7. The battery according to claim 6, characterized in that, The support frame (6) includes a first fixing portion (61), a first extending portion (62), a supporting portion (63), a second extending portion (64) and a second fixing portion (65) which are connected in sequence; Both the first fixing portion (61) and the second fixing portion (65) are fixedly connected to the cross beam (13). The first extending portion (62) is bent upward relative to the first fixing portion (61), the second extending portion (64) is bent upward relative to the second fixing portion (65), and the top surface of the supporting portion (63) directly or indirectly abuts against the bottom surface of the heat exchange top plate (2).

8. The battery according to claim 6, wherein, The fastener (5) includes an expansion nut (51) and a first bolt (52). A part of the expansion nut (51) is located in the exhaust passage (14) and is fixedly connected to the cross beam (13). The first bolt (52) penetrates through the box cover (4) and is connected to the expansion nut (51). The expansion nut (51) expands under the connection of the first bolt (52) and applies the pressure to the heat exchange top plate (2) in a direction close to the cross beam (13), and the first bolt (52) and the expansion nut (51) jointly clamp the box cover (4).

9. The battery according to claim 8, characterized in that, The box body (1) includes a frame (12) and a bottom guard plate (15) connected to the bottom of the frame (12). The frame (12) and the bottom guard plate (15) jointly enclose to form the receiving groove (11), and the cross beam (13) is connected to the frame (12); The battery further includes a heat exchange bottom plate (7) placed in the receiving groove (11), and the heat exchange bottom plate (7) is disposed at the bottom of a plurality of the battery monomers (3); The fastener (5) further includes a second bolt (53), the second bolt (53) sequentially passes through the bottom guard plate (15), the heat exchange bottom plate (7) and the cross beam (13) and is connected to the expansion nut (51), the expansion nut (51) expands under the connection of the second bolt (53) and jointly clamps the heat exchange bottom plate (7) with the bottom surface of the cross beam (13), and the second bolt (53) and the expansion nut (51) jointly clamp the bottom guard plate (15).

10. An electrical device, characterized in that, Comprising the battery according to any one of claims 1 to 9.

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