Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, the battery module comprises a battery cell group, the battery cell group comprises a plurality of battery cells, and the battery cells are provided with electrode terminals; and the liquid cooling integration mechanism is arranged on one side, facing the electrode terminals, of the battery cells in the battery cell group, the liquid cooling integration mechanism comprises a chip and a liquid cooling structure, the chip is embedded and fixed on the liquid cooling structure, and the chip is electrically connected with the electrode terminals. According to the battery module provided by the embodiment of the invention, independent heat dissipation can be carried out on the electrode terminals and the chips on the battery cell group, and the temperature rise at the electrode terminals is effectively reduced, so that the temperature consistency of the battery module can be improved, and the safety performance of the battery pack is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery module and a battery pack. Background Art

[0002] The temperature of the battery has a certain influence on the working stability of the battery, so better heat dissipation performance can improve the working stability of the battery.

[0003] In the related art, a separate liquid cooling plate is used to dissipate heat from the battery module in the battery pack. The liquid cooling plate is usually arranged at the bottom of the battery module to dissipate heat from the battery module. However, when the battery module in the related art is working, the temperature at the electrode terminal is high, resulting in poor temperature consistency of the battery module, which in turn affects the safety performance of the battery pack. Utility Model Content

[0004] The embodiments of the present application provide a battery module and a battery pack, which are used to solve the technical problem in the related art that the temperature of the battery module is high at the electrode terminals during operation, resulting in poor temperature consistency of the battery module, thereby affecting the safety performance of the battery pack.

[0005] In order to achieve the above objectives, the present application provides the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a battery module, comprising:

[0007] A battery cell group, the battery cell group comprising a plurality of battery cells, the battery cells having electrode terminals;

[0008] A liquid-cooling integrated mechanism, wherein the liquid-cooling integrated mechanism is arranged on the side of the battery cell in the battery cell group toward which the electrode terminal faces, and the liquid-cooling integrated mechanism comprises: a bar and a liquid-cooling structure, wherein the bar is embedded and fixed on the liquid-cooling structure, and the bar is electrically connected to the electrode terminal.

[0009] Based on the above technical solution, the present application can also be improved as follows.

[0010] In a possible implementation, the liquid cooling structure has a flow channel for liquid flow;

[0011] The liquid cooling structure has a weak portion on one side facing the electrode terminal;

[0012] The weak portion can be broken when the battery core reaches a preset temperature, so that the liquid in the flow channel flows toward the battery core.

[0013] In a possible implementation manner, the battery core includes an explosion-proof valve, and the weak portion is arranged corresponding to the explosion-proof valve.

[0014] In a possible implementation, a side wall of the liquid cooling structure facing the electrode terminal is partially thinned to form an exhaust groove, and a top wall of the exhaust groove is configured as the weak portion.

[0015] In a possible implementation, the liquid cooling structure has a flow channel for liquid flow;

[0016] A projection of the bar sheet along the thickness direction of the liquid cooling structure falling on the plane where the flow channel is located at least partially overlaps with the flow channel.

[0017] In a possible implementation, the flow channel includes:

[0018] A plurality of first flow channels, wherein the first flow channels extend along the length direction of the liquid cooling structure, and the plurality of first flow channels are arranged at intervals along the width direction of the liquid cooling structure;

[0019] A plurality of second flow channels, wherein the second flow channels extend along the width direction of the liquid cooling structure, and the plurality of second flow channels are arranged at intervals along the length direction of the liquid cooling structure, and the first flow channel and the second flow channel are connected to each other.

[0020] In a possible implementation, each battery cell is connected to two of the bar plates, the two bar plates are arranged at intervals along the width direction of the liquid cooling structure, the bar plates extend along the length direction of the liquid cooling structure, and the projection of the bar plates along the thickness direction of the liquid cooling structure falling on the plane where the first flow channel is located overlaps with part of the first flow channel.

[0021] In a possible implementation, the liquid cooling structure includes:

[0022] A first structure, wherein the first structure has a plurality of first grooves arranged at intervals, and the first grooves extend along the length direction of the liquid cooling structure;

[0023] The first structure also has a plurality of second grooves arranged at intervals, the second grooves extend along the width direction of the liquid cooling structure, and the second grooves are connected to the first grooves;

[0024] a second structure, the second structure being covered on the first structure, so that the first groove and the second structure enclose the first flow channel, and the second groove and the second structure enclose the second flow channel;

[0025] The bar is arranged on a side of the first structure facing away from the second structure.

[0026] In a possible implementation, the liquid cooling structure includes:

[0027] A liquid inlet end, the liquid inlet end being arranged at one end in the length direction of the liquid cooling structure, and the liquid inlet end being capable of allowing liquid to flow into the liquid cooling structure;

[0028] The liquid outlet end is arranged at the other end of the liquid cooling structure in the length direction, and the liquid outlet end and the liquid inlet end are staggered in the width direction of the liquid cooling structure, and the liquid outlet end allows liquid to flow out of the liquid cooling structure.

[0029] In a possible implementation, a third groove is provided on a side of the liquid cooling structure facing the battery core, and the bar is disposed in the third groove.

[0030] In a possible implementation, a welding avoidance through hole is provided in a region of the liquid cooling structure corresponding to the bar.

[0031] In a possible implementation, the battery module further includes a sampling structure, which is disposed on a side of the liquid cooling structure facing away from the battery cell, and the sampling structure is electrically connected to the bar sheet through the welding avoidance through hole.

[0032] In a possible implementation, the liquid cooling structure is an insulating injection molded part.

[0033] A second aspect of an embodiment of the present application provides a battery pack, which includes the battery module as described above.

[0034] The embodiments of the present application provide a battery module and a battery pack. The battery module connects a tab to an electrode terminal and provides a liquid cooling integrated mechanism at the end of the tab facing away from the electrode terminal. This enables separate heat dissipation of the electrode terminals on the battery cell group, effectively reducing the temperature rise at the electrode terminals, thereby improving the temperature consistency of the battery module and enhancing the safety performance of the battery pack.

[0035] Furthermore, by embedding and fixing the bar piece on the liquid cooling structure of the liquid cooling integrated mechanism, the integration of the battery module can be improved, the separate positioning process in the bar piece welding process can be reduced, and the welding efficiency between the bar piece and the electrode terminal can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic diagram of the structure of a battery module provided in an embodiment of the present application;

[0038] Figure 2 A schematic cross-sectional view of a battery module provided in an embodiment of the present application;

[0039] Figure 3 A schematic diagram of the structure of a liquid cooling integrated mechanism provided in an embodiment of the present application;

[0040] Figure 4 An exploded diagram of a liquid cooling integrated mechanism provided in an embodiment of the present application;

[0041] Figure 5 A schematic structural diagram from another angle of a liquid cooling integrated mechanism provided in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 100-cell group;

[0044] 110-battery cell; 120-electrode terminal; 130-explosion-proof valve;

[0045] 200-Liquid cooling integrated mechanism;

[0046] 210-battery; 220-liquid cooling structure;

[0047] 221-flow channel; 222-weak portion; 223-exhaust groove; 224-first structure;

[0048] 225-second structure; 226-liquid inlet end; 227-liquid outlet end; 228-third groove;

[0049] 229-welding avoidance through hole;

[0050] 2211-first flow channel; 2212-second flow channel; 2241-first groove;

[0051] 2242-second groove;

[0052] 300-sampling structure. DETAILED DESCRIPTION

[0053] As described in the background technology, the battery module in the prior art has a high temperature at the electrode terminal during operation, resulting in poor temperature consistency of the battery module, which in turn affects the safety performance of the battery pack. The reason for this problem is that the electrode terminal of the battery module in the prior art is set at the top of the battery cell stacking structure, and there is no heat dissipation device at the electrode terminal. During the operation of the battery module, the heat generated at the electrode terminal is also large, resulting in a high temperature at the electrode terminal, and heat dissipation devices are set at other positions of the battery cell group, resulting in uneven surface temperature of the battery cell group, which leads to poor temperature consistency of the battery module, which in turn affects the safety performance of the battery pack.

[0054] In response to the above technical problems, the embodiments of the present application provide a battery module and a battery pack. The battery module connects the bar sheet to the electrode terminal and provides a liquid cooling integrated mechanism at the end of the bar sheet facing away from the electrode terminal. This can achieve centralized heat dissipation of the electrode terminals on the battery cell group and effectively reduce the temperature rise at the electrode terminals, thereby improving the temperature consistency of the battery module and improving the safety performance of the battery pack.

[0055] Furthermore, by embedding and fixing the bar piece on the liquid cooling structure to form a liquid cooling integrated mechanism, the integration of the battery module can be improved, the separate positioning process in the bar piece welding process can be reduced, and the welding efficiency between the bar piece and the electrode terminal can be improved.

[0056] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0057] refer to Figure 1 An embodiment of the present application provides a battery module, which may include a battery cell group 100 and a liquid cooling integrated mechanism 200.

[0058] refer to Figure 1 and Figure 2 , the battery cell group 100 may include a plurality of battery cells 110, so that the plurality of battery cells 110 are stacked to form the battery cell group 100. Each battery cell 110 in the battery cell group 100 has an electrode terminal 120, which can be connected in series and parallel and finally electrically connect the battery cell group 100 to the positive and negative output electrodes of the battery pack to transmit the electric energy of the battery cell 110 to the positive and negative output electrodes and further to the electrical equipment outside the battery pack. The high temperature at the electrode terminal 120 results in poor temperature consistency of the battery module, which in turn affects the safety performance of the battery pack.

[0059] refer to Figure 1 and Figure 2 The liquid cooling integrated mechanism 200 is arranged on the side of the battery cell group 100 where the electrode terminal 120 of the battery cell 110 faces. By arranging the liquid cooling integrated mechanism 200 on the side where the electrode terminal 120 of the battery cell 110 is located, the electrode terminal 120 can be cooled by the liquid cooling integrated mechanism 200, and the heat dissipation efficiency at the electrode terminal 120 of the battery cell 110 can be improved, thereby improving the temperature consistency of the battery module and improving the safety performance of the battery pack.

[0060] In some embodiments, the liquid-cooling integrated mechanism 200 can be connected to the electrode terminal 120 of the battery cell 110 to improve the heat dissipation effect of the electrode terminal 120 . For example, the liquid-cooling integrated mechanism 200 can be connected to the electrode terminal 120 by welding.

[0061] refer to Figure 2 The liquid cooling integrated mechanism 200 may include a bar 210 and a liquid cooling structure 220. The bar 210 is embedded and fixed on the liquid cooling structure 220, and the bar 210 is arranged toward the electrode terminal 120. The bar 210 is located between the liquid cooling structure 220 and the electrode terminal 120. The bar 210 can be electrically connected to each electrode terminal 120 of the battery cell 110 in the battery cell group 100, so as to realize the current convergence of each battery cell 110 in the battery cell group 100 through the bar 210.

[0062] By embedding and fixing the bar piece 210 on the liquid cooling structure 220 to form a liquid cooling integrated mechanism 200, the integration of the battery module can be improved, the separate positioning process during the welding of the bar piece 210 can be reduced, and the welding efficiency between the bar piece 210 and the electrode terminal 120 can be improved.

[0063] In some embodiments, the liquid cooling structure 220 can be injection molded on the bar sheet 210, or the liquid cooling mechanism can be embedded in the side of the liquid cooling structure 220 facing the electrode terminal 120 by interference fit.

[0064] The bar sheet 210 is electrically connected to the electrode terminal 120 of each battery cell 110. During the operation of the battery module, the electrode terminal 120 generates a large amount of heat. Part of the heat can be transferred to the bar sheet 210, and further transferred from the bar sheet 210 to the liquid cooling structure 220, so that the liquid cooling structure 220 can take away the heat. Since the liquid cooling structure 220 is close to the electrode terminal 120, another part of the heat can be directly transferred to the liquid cooling structure 220 through the air.

[0065] refer to Figure 2 In some embodiments, the liquid cooling structure 220 has a flow channel 221 for liquid flow. The liquid in the flow channel 221 of the liquid cooling structure 220 can exchange heat with the heat transferred to the liquid cooling structure 220 from the electrode terminal 120, so that the liquid in the flow channel 221 takes away the heat of the electrode terminal 120 to achieve the effect of dissipating heat from the electrode terminal 120.

[0066] In some embodiments, the liquid in the flow channel 221 of the liquid cooling structure 220 may be water or other cooling liquids.

[0067] The battery cells in the battery cell group in the related art may have problems of local temperature rise or rupture and fire when thermal runaway occurs. For example, the battery cells may rupture and catch fire due to squeezing or collision, or the battery cells may rupture and catch fire due to high temperature, affecting the safety of battery module and battery pack.

[0068] refer to Figure 2 In some embodiments, the liquid cooling structure 220 has a weak portion 222 on one side facing the electrode terminal 120. The weak portion 222 can rupture when the battery cell 110 reaches a preset temperature, so that the liquid in the flow channel 221 can flow to the battery cell 110, thereby enabling the liquid in the flow channel 221 of the liquid cooling structure 220 to flow to the fire area on the battery cell 110 to achieve a fire extinguishing function.

[0069] By setting the weak portion 222, the weak portion 222 on the liquid cooling structure 220 is easier to rupture relative to other positions on the liquid cooling structure 220, so that the weak portion 222 is easier to rupture, and the liquid in the flow channel 221 flows out from the rupture of the weak portion 222 and flows to the fire area on the battery cell 110 to achieve the function of extinguishing the fire. In this way, the liquid cooling structure 220 can not only dissipate heat for the electrode terminal 120, but also extinguish the fire in the fire area on the battery cell 110, thereby enriching the function of the liquid cooling integrated mechanism 200.

[0070] In some embodiments, the weak portion 222 on the liquid cooling structure 220 can be arranged corresponding to the flow channel 221 in the liquid cooling structure 220, so that the liquid in the flow channel 221 flows out directly from the weak portion 222, thereby increasing the speed of liquid outflow and thereby improving the efficiency of the liquid in extinguishing the fire in the fire extinguishing area on the battery cell 110.

[0071] In other embodiments, the structure in the area where the weak portion 222 on the liquid cooling structure 220 is located is more likely to melt or rupture at high temperatures than the structures in other areas on the liquid cooling structure 220 , so that the weak portion 222 ruptures before other areas on the liquid cooling structure 220 .

[0072] In some other embodiments, in the thickness direction of the liquid cooling structure 220, the distance from the wall surface close to the flow channel 221 on the weak portion 222 to the inner wall surface of the flow channel 221 in the liquid cooling structure 220 is smaller than the distance from the outer wall surface of other areas on the liquid cooling structure 220 to the inner wall surface of the flow channel 221 in the liquid cooling structure 220.

[0073] Specifically, a groove may be formed by slotting the wall of the liquid cooling structure 220 facing the electrode terminal 120, and the bottom wall of the groove is configured as a weak portion 222. In the thickness direction of the liquid cooling structure 220, the distance from the bottom surface to the inner wall surface of the flow channel 221 can be smaller than the distance from the outer wall surface of other areas on the liquid cooling structure 220 to the inner wall surface of the flow channel 221.

[0074] Continue to refer Figure 2 In some embodiments, the battery cell 110 may include an explosion-proof valve 130, which is a safety device that can be used to prevent the battery cell 110 from exploding or catching fire under abnormal circumstances. When the internal pressure of the battery cell 110 exceeds a set value, the explosion-proof valve 130 will open to release the pressure to relieve the internal pressure of the battery and prevent the battery from overheating or exploding. This helps to protect the safety of the battery and reduce potential dangers.

[0075] Furthermore, when the battery cell 110 is in a state of thermal runaway, the explosion-proof valve 130 is more likely to experience a risk of localized temperature rise or fire than other positions on the battery cell 110 .

[0076] The weak portion 222 is disposed correspondingly to the explosion-proof valve 130, and the side of the weak portion 222 facing the battery cell 110 corresponds to the explosion-proof valve 130. By disposing the weak portion 222 correspondingly to the explosion-proof valve 130, it is convenient for the liquid flowing out when the weak portion 222 ruptures to flow to the area where the explosion-proof valve 130 is located, thereby facilitating the improvement of the fire extinguishing efficiency of the liquid cooling structure 220.

[0077] refer to Figure 2 In some embodiments, a side wall of the liquid cooling structure 220 facing the electrode terminal 120 is partially thinned to form an exhaust groove 223 , and a top wall of the exhaust groove 223 is configured as a weak portion 222 .

[0078] By partially thinning a side wall of the liquid cooling structure 220 facing the electrode terminal 120 to form the exhaust groove 223 , an exhaust passage can be defined between the thinned portion and the electrode terminal 120 to facilitate air flow in this area.

[0079] In a specific implementation, when the explosion-proof valve 130 releases pressure and exhausts gas, the pressure released by the explosion-proof valve 130 and the exhausted gas can be discharged into the external environment through the exhaust groove 223, thereby improving the safety of the battery module.

[0080] refer to Figure 2 In some embodiments, the liquid cooling structure 220 has a flow channel 221 for liquid flow, and the projection of the bar 210 along the thickness direction of the liquid cooling structure 220 on the plane where the flow channel 221 is located at least partially overlaps with the flow channel 221.

[0081] In the thickness direction of the liquid cooling structure 220, by making the projection of the bar plate 210 partially overlap with the projection of the flow channel 221, the heat transferred from the electrode terminal 120 to the bar plate 210 can be easily exchanged with the liquid in the flow channel 221, thereby improving the heat dissipation efficiency of the liquid cooling integrated mechanism 200 for the electrode terminal 120.

[0082] In some embodiments, in the thickness direction of the liquid-cooling structure 220 , the projection of the bar sheet 210 partially overlaps with the projection of the flow channel 221 . Alternatively, in the thickness direction of the liquid-cooling structure 220 , the projection of the bar sheet 210 completely overlaps with the projection of the flow channel 221 .

[0083] refer to Figure 3 and Figure 4 In some embodiments, the flow channel 221 may include a plurality of first flow channels 2211 and a plurality of second flow channels 2212 .

[0084] The first flow channel 2211 can extend along the length direction of the liquid cooling structure 220 , and a plurality of first flow channels 2211 are arranged at intervals along the width direction of the liquid cooling structure 220 .

[0085] The second flow channel 2212 extends along the width direction of the liquid cooling structure 220 , and a plurality of second flow channels 2212 are arranged at intervals along the length direction of the liquid cooling structure 220 , and the first flow channel 2211 is connected to the second flow channel 2212 .

[0086] By making the first flow channel 2211 extend along the length direction of the liquid cooling structure 220, and the plurality of first flow channels 2211 are arranged at intervals along the width direction of the liquid cooling structure 220, and making the second flow channel 2212 connected with the first flow channel 2211 extend along the width direction of the liquid cooling structure 220, and the plurality of second flow channels 2212 are arranged at intervals along the length direction of the liquid cooling structure 220, the uniformity of arrangement of the liquid in the flow channel 221 can be improved, thereby improving the uniformity of heat dissipation of the liquid cooling structure 220. In addition, the situation where the heat exchange effect is poor due to uneven local heat dissipation or poor flow of liquid in the flow channel 221 can be avoided, thereby improving the working stability of the liquid cooling structure 220 and the working stability of the liquid cooling integrated mechanism 200.

[0087] refer to Figure 5 In some embodiments, each battery cell 110 is connected to two bars 210, and the two bars 210 are arranged at intervals along the width direction of the liquid cooling structure 220. The bars 210 extend along the length direction of the liquid cooling structure 220, and the projection of the bars 210 along the thickness direction of the liquid cooling structure 220 falling on the plane where the first flow channel 2211 is located overlaps with part of the first flow channel 2211.

[0088] In the thickness direction of the liquid-cooling structure 220, by making the projection of the bar 210 falling on the plane where the first channel 2211 is located overlap with part of the first channel 2211, it is convenient for the bar 210 to transfer heat to the liquid in the first channel 2211, so that the liquid in the first channel 2211 can take away the heat transferred from the electrode terminal 120 to the bar 210, thereby improving the heat transfer efficiency on the liquid-cooling structure 220, and further improving the heat dissipation efficiency of the liquid-cooling structure 220, so as to improve the heat dissipation effect of the liquid-cooling integrated mechanism 200 on the electrode terminal 120.

[0089] refer to Figure 4 In some embodiments, the liquid cooling structure 220 may include a first structure 224 and a second structure 225 .

[0090] The first structure 224 has a plurality of first grooves 2241 disposed at intervals therein, and the first grooves 2241 extend along the length direction of the liquid cooling structure 220. The first structure 224 also has a plurality of second grooves 2242 disposed at intervals therein, and the second grooves 2242 extend along the width direction of the liquid cooling structure 220, and the second grooves 2242 and the first grooves 2241 are connected to each other.

[0091] The second structure 225 is covered on the first structure 224, so that the first groove 2241 and the second structure 225 form a first flow channel 2211, and the second groove 2242 and the second structure 225 form a second flow channel 2212;

[0092] The tab 210 is disposed on a side of the first structure 224 facing away from the second structure 225 .

[0093] By configuring the liquid cooling structure 220 to consist of two parts, the first structure 224 and the second structure 225 , the processing and manufacturing of the liquid cooling structure 220 can be facilitated.

[0094] In some embodiments, the first structure 224 and the second structure 225 can be connected in a detachable manner. For example, the first structure 224 and the second structure 225 can be connected by a threaded connection.

[0095] refer to Figure 3 and Figure 4 In a possible implementation, the liquid cooling structure 220 may include a liquid inlet 226 and a liquid outlet 227 .

[0096] The liquid inlet end 226 is disposed at one end of the liquid cooling structure 220 in the length direction, and the liquid inlet end 226 allows liquid to flow into the liquid cooling structure 220 .

[0097] The liquid outlet 227 is disposed at the other end of the liquid cooling structure 220 in the length direction, and the liquid outlet 227 and the liquid inlet 226 are staggered in the width direction of the liquid cooling structure 220 . The liquid outlet 227 allows liquid to flow out of the liquid cooling structure 220 .

[0098] refer to Figure 2 In a possible implementation, in some embodiments, a third groove 228 is provided on a side of the liquid cooling structure 220 facing the battery cell 110 , and the tab 210 is disposed in the third groove 228 .

[0099] The tab 210 can be embedded in the third groove 228. By embedding the tab 210 in the third groove 228, the connection stability between the tab 210 and the liquid cooling structure 220 can be improved, and the tab 210 and the liquid cooling structure 220 can be avoided from being separated from each other, thereby improving the overall structural stability of the liquid cooling integrated mechanism 200 and further improving the overall stability of the battery module.

[0100] In other embodiments, an adhesive layer may be provided between the tab 210 and the top surface of the third groove 228, so that while the tab 210 is embedded in the third groove 228, the tab 210 can be further connected to the top wall of the third groove 228 through the adhesive layer, thereby further improving the connection stability between the tab 210 and the liquid cooling structure 220.

[0101] refer to Figure 3 and Figure 4 In some embodiments, the battery module may further include a sampling structure 300, which is disposed on a side of the liquid cooling structure 220 facing away from the battery cell 110. A welding avoidance through hole 229 is also provided in an area of ​​the liquid cooling structure 220 corresponding to the bar piece 210, and the sampling structure 300 is electrically connected to the bar piece 210 through the welding avoidance through hole 229.

[0102] By opening a welding avoidance through hole 229 in the area of ​​the liquid cooling structure 220 corresponding to the bar piece 210 , welding between the bar piece 210 and the electrode terminal 120 and welding between the sampling structure 300 and the bar piece 210 can be facilitated.

[0103] In a possible implementation, the liquid cooling structure 220 may be an insulating injection-molded part, and the liquid cooling structure 220 may be injection-molded on the bar sheet 210 .

[0104] By setting the liquid cooling structure 220 as an insulating injection molded part, since the liquid cooling structure 220 is made of insulating material, the liquid cooling structure 220 can effectively isolate the heat conduction and electrical contact between the circuit board and the electrode terminal 120 when connected to the electrode terminal 120, thereby reducing the probability of short circuit. This can improve the safety of the battery module and reduce the possibility of electrical failure.

[0105] refer to Figure 1 On the basis of the above embodiment, the embodiment of the present application further provides a battery pack, which includes the above battery module. By using the battery pack prepared by the above battery module, it is possible to achieve separate heat dissipation at the electrode terminal 120, so as to effectively reduce the temperature rise at the electrode terminal 120, improve the temperature consistency of the battery module, and improve the safety performance of the battery pack.

[0106] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0107] It should be noted that the phrases "in specific implementation", "in some embodiments", "in this embodiment", "exemplarily" and the like mentioned in the specification indicate that the described embodiment may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0108] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0109] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0110] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery module, characterized in that: include: A battery cell group, the battery cell group comprising a plurality of battery cells, the battery cells having electrode terminals; A liquid-cooling integrated mechanism, wherein the liquid-cooling integrated mechanism is arranged on the side of the battery cell in the battery cell group toward which the electrode terminal faces, and the liquid-cooling integrated mechanism comprises: a bar and a liquid-cooling structure, wherein the bar is embedded and fixed on the liquid-cooling structure, and the bar is electrically connected to the electrode terminal.

2. The battery module according to claim 1, characterized in that: The liquid cooling structure has a flow channel for liquid flow; The liquid cooling structure has a weak portion on one side facing the electrode terminal; The weak portion can be broken when the battery core reaches a preset temperature, so that the liquid in the flow channel flows toward the battery core.

3. The battery module according to claim 2, characterized in that: The battery core includes an explosion-proof valve, and the weak portion is arranged corresponding to the explosion-proof valve.

4. The battery module according to claim 2, characterized in that: A side wall of the liquid cooling structure facing the electrode terminal is partially thinned to form an exhaust groove, and a top wall of the exhaust groove is configured as the weak portion.

5. The battery module according to claim 1, characterized in that: The liquid cooling structure has a flow channel for liquid flow; A projection of the bar sheet along the thickness direction of the liquid cooling structure falling on the plane where the flow channel is located at least partially overlaps with the flow channel.

6. The battery module according to claim 5, characterized in that: The flow channel comprises: A plurality of first flow channels, wherein the first flow channels extend along the length direction of the liquid cooling structure, and the plurality of first flow channels are arranged at intervals along the width direction of the liquid cooling structure; A plurality of second flow channels, wherein the second flow channels extend along the width direction of the liquid cooling structure, and the plurality of second flow channels are arranged at intervals along the length direction of the liquid cooling structure, and the first flow channel and the second flow channel are connected to each other.

7. The battery module according to claim 6, characterized in that: Each battery cell is connected to two of the bars, and the two bars are arranged at intervals along the width direction of the liquid cooling structure. The bars extend along the length direction of the liquid cooling structure, and the projection of the bars along the thickness direction of the liquid cooling structure falling on the plane where the first flow channel is located overlaps with part of the first flow channel.

8. The battery module according to claim 6, characterized in that: The liquid cooling structure comprises: A first structure, wherein the first structure has a plurality of first grooves arranged at intervals, and the first grooves extend along the length direction of the liquid cooling structure; The first structure also has a plurality of second grooves arranged at intervals, the second grooves extend along the width direction of the liquid cooling structure, and the second grooves are connected to the first grooves; a second structure, the second structure being covered on the first structure, so that the first groove and the second structure enclose the first flow channel, and the second groove and the second structure enclose the second flow channel; The flap is disposed on a side of the first structure facing away from the second structure.

9. The battery module according to claim 1, characterized in that: The liquid cooling structure comprises: A liquid inlet end, the liquid inlet end being arranged at one end in the length direction of the liquid cooling structure, and the liquid inlet end being capable of allowing liquid to flow into the liquid cooling structure; The liquid outlet end is arranged at the other end of the liquid cooling structure in the length direction, and the liquid outlet end and the liquid inlet end are staggered in the width direction of the liquid cooling structure, and the liquid outlet end allows liquid to flow out of the liquid cooling structure.

10. The battery module according to claim 1, characterized in that: A third groove is formed on a side of the liquid cooling structure facing the battery core, and the bar is arranged in the third groove.

11. The battery module according to claim 1, characterized in that: A welding avoidance through hole is provided in an area of ​​the liquid cooling structure corresponding to the bar.

12. The battery module according to claim 11, characterized in that: The battery module also includes a sampling structure, which is arranged on a side of the liquid cooling structure facing away from the battery cell, and the sampling structure is electrically connected to the bar sheet through the welding avoidance through hole.

13. The battery module according to claim 1, characterized in that: The liquid cooling structure is an insulating injection molded part.

14. A battery pack, characterized in that: Comprising the battery module as claimed in any one of claims 1 to 13.

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